two version of R2R are here HEAD master

10 files changed, 9121 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/xlrd/__init__.py b/.venv/lib/python3.12/site-packages/xlrd/__init__.py
new file mode 100644
index 00000000..84d5f269
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/__init__.py
@@ -0,0 +1,213 @@
+# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+import os
+import pprint
+import sys
+import zipfile
+
+from . import timemachine
+from .biffh import (
+    XL_CELL_BLANK, XL_CELL_BOOLEAN, XL_CELL_DATE, XL_CELL_EMPTY, XL_CELL_ERROR,
+    XL_CELL_NUMBER, XL_CELL_TEXT, XLRDError, biff_text_from_num,
+    error_text_from_code,
+)
+from .book import Book, colname, open_workbook_xls
+from .compdoc import SIGNATURE as XLS_SIGNATURE
+from .formula import *  # is constrained by __all__
+from .info import __VERSION__, __version__
+from .sheet import empty_cell
+from .xldate import XLDateError, xldate_as_datetime, xldate_as_tuple
+
+
+#: descriptions of the file types :mod:`xlrd` can :func:`inspect <inspect_format>`.
+FILE_FORMAT_DESCRIPTIONS = {
+    'xls': 'Excel xls',
+    'xlsb': 'Excel 2007 xlsb file',
+    'xlsx': 'Excel xlsx file',
+    'ods': 'Openoffice.org ODS file',
+    'zip': 'Unknown ZIP file',
+    None: 'Unknown file type',
+}
+
+ZIP_SIGNATURE = b"PK\x03\x04"
+
+PEEK_SIZE = max(len(XLS_SIGNATURE), len(ZIP_SIGNATURE))
+
+
+def inspect_format(path=None, content=None):
+    """
+    Inspect the content at the supplied path or the :class:`bytes` content provided
+    and return the file's type as a :class:`str`, or ``None`` if it cannot
+    be determined.
+
+    :param path:
+      A :class:`string <str>` path containing the content to inspect.
+      ``~`` will be expanded.
+
+    :param content:
+      The :class:`bytes` content to inspect.
+
+    :returns:
+       A :class:`str`, or ``None`` if the format cannot be determined.
+       The return value can always be looked up in :data:`FILE_FORMAT_DESCRIPTIONS`
+       to return a human-readable description of the format found.
+    """
+    if content:
+        peek = content[:PEEK_SIZE]
+    else:
+        path = os.path.expanduser(path)
+        with open(path, "rb") as f:
+            peek = f.read(PEEK_SIZE)
+
+    if peek.startswith(XLS_SIGNATURE):
+        return 'xls'
+
+    if peek.startswith(ZIP_SIGNATURE):
+        zf = zipfile.ZipFile(timemachine.BYTES_IO(content) if content else path)
+
+        # Workaround for some third party files that use forward slashes and
+        # lower case names. We map the expected name in lowercase to the
+        # actual filename in the zip container.
+        component_names = {name.replace('\\', '/').lower(): name
+                           for name in zf.namelist()}
+
+        if 'xl/workbook.xml' in component_names:
+            return 'xlsx'
+        if 'xl/workbook.bin' in component_names:
+            return 'xlsb'
+        if 'content.xml' in component_names:
+            return 'ods'
+        return 'zip'
+
+
+def open_workbook(filename=None,
+                  logfile=sys.stdout,
+                  verbosity=0,
+                  use_mmap=True,
+                  file_contents=None,
+                  encoding_override=None,
+                  formatting_info=False,
+                  on_demand=False,
+                  ragged_rows=False,
+                  ignore_workbook_corruption=False
+                  ):
+    """
+    Open a spreadsheet file for data extraction.
+
+    :param filename: The path to the spreadsheet file to be opened.
+
+    :param logfile: An open file to which messages and diagnostics are written.
+
+    :param verbosity: Increases the volume of trace material written to the
+                      logfile.
+
+    :param use_mmap:
+
+      Whether to use the mmap module is determined heuristically.
+      Use this arg to override the result.
+
+      Current heuristic: mmap is used if it exists.
+
+    :param file_contents:
+
+      A string or an :class:`mmap.mmap` object or some other behave-alike
+      object. If ``file_contents`` is supplied, ``filename`` will not be used,
+      except (possibly) in messages.
+
+    :param encoding_override:
+
+      Used to overcome missing or bad codepage information
+      in older-version files. See :doc:`unicode`.
+
+    :param formatting_info:
+
+      The default is ``False``, which saves memory.
+      In this case, "Blank" cells, which are those with their own formatting
+      information but no data, are treated as empty by ignoring the file's
+      ``BLANK`` and ``MULBLANK`` records.
+      This cuts off any bottom or right "margin" of rows of empty or blank
+      cells.
+      Only :meth:`~xlrd.sheet.Sheet.cell_value` and
+      :meth:`~xlrd.sheet.Sheet.cell_type` are available.
+
+      When ``True``, formatting information will be read from the spreadsheet
+      file. This provides all cells, including empty and blank cells.
+      Formatting information is available for each cell.
+
+      Note that this will raise a NotImplementedError when used with an
+      xlsx file.
+
+    :param on_demand:
+
+      Governs whether sheets are all loaded initially or when demanded
+      by the caller. See :doc:`on_demand`.
+
+    :param ragged_rows:
+
+      The default of ``False`` means all rows are padded out with empty cells so
+      that all rows have the same size as found in
+      :attr:`~xlrd.sheet.Sheet.ncols`.
+
+      ``True`` means that there are no empty cells at the ends of rows.
+      This can result in substantial memory savings if rows are of widely
+      varying sizes. See also the :meth:`~xlrd.sheet.Sheet.row_len` method.
+
+
+    :param ignore_workbook_corruption:
+
+      This option allows to read corrupted workbooks.
+      When ``False`` you may face CompDocError: Workbook corruption.
+      When ``True`` that exception will be ignored.
+
+    :returns: An instance of the :class:`~xlrd.book.Book` class.
+    """
+
+    file_format = inspect_format(filename, file_contents)
+    # We have to let unknown file formats pass through here, as some ancient
+    # files that xlrd can parse don't start with the expected signature.
+    if file_format and file_format != 'xls':
+        raise XLRDError(FILE_FORMAT_DESCRIPTIONS[file_format]+'; not supported')
+
+    bk = open_workbook_xls(
+        filename=filename,
+        logfile=logfile,
+        verbosity=verbosity,
+        use_mmap=use_mmap,
+        file_contents=file_contents,
+        encoding_override=encoding_override,
+        formatting_info=formatting_info,
+        on_demand=on_demand,
+        ragged_rows=ragged_rows,
+        ignore_workbook_corruption=ignore_workbook_corruption,
+    )
+
+    return bk
+
+
+def dump(filename, outfile=sys.stdout, unnumbered=False):
+    """
+    For debugging: dump an XLS file's BIFF records in char & hex.
+
+    :param filename: The path to the file to be dumped.
+    :param outfile: An open file, to which the dump is written.
+    :param unnumbered: If true, omit offsets (for meaningful diffs).
+    """
+    from .biffh import biff_dump
+    bk = Book()
+    bk.biff2_8_load(filename=filename, logfile=outfile, )
+    biff_dump(bk.mem, bk.base, bk.stream_len, 0, outfile, unnumbered)
+
+
+def count_records(filename, outfile=sys.stdout):
+    """
+    For debugging and analysis: summarise the file's BIFF records.
+    ie: produce a sorted file of ``(record_name, count)``.
+
+    :param filename: The path to the file to be summarised.
+    :param outfile: An open file, to which the summary is written.
+    """
+    from .biffh import biff_count_records
+    bk = Book()
+    bk.biff2_8_load(filename=filename, logfile=outfile, )
+    biff_count_records(bk.mem, bk.base, bk.stream_len, outfile)
diff --git a/.venv/lib/python3.12/site-packages/xlrd/biffh.py b/.venv/lib/python3.12/site-packages/xlrd/biffh.py
new file mode 100644
index 00000000..07ac6291
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/biffh.py
@@ -0,0 +1,643 @@
+# -*- coding: utf-8 -*-
+# Portions copyright © 2005-2010 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+from __future__ import print_function
+
+import sys
+from struct import unpack
+
+from .timemachine import *
+
+DEBUG = 0
+
+
+
+class XLRDError(Exception):
+    """
+    An exception indicating problems reading data from an Excel file.
+    """
+
+
+class BaseObject(object):
+    """
+    Parent of almost all other classes in the package. Defines a common
+    :meth:`dump` method for debugging.
+    """
+
+    _repr_these = []
+
+
+    def dump(self, f=None, header=None, footer=None, indent=0):
+        """
+        :param f: open file object, to which the dump is written
+        :param header: text to write before the dump
+        :param footer: text to write after the dump
+        :param indent: number of leading spaces (for recursive calls)
+        """
+        if f is None:
+            f = sys.stderr
+        if hasattr(self, "__slots__"):
+            alist = []
+            for attr in self.__slots__:
+                alist.append((attr, getattr(self, attr)))
+        else:
+            alist = self.__dict__.items()
+        alist = sorted(alist)
+        pad = " " * indent
+        if header is not None: print(header, file=f)
+        list_type = type([])
+        dict_type = type({})
+        for attr, value in alist:
+            if getattr(value, 'dump', None) and attr != 'book':
+                value.dump(f,
+                    header="%s%s (%s object):" % (pad, attr, value.__class__.__name__),
+                    indent=indent+4)
+            elif (attr not in self._repr_these and
+                  (isinstance(value, list_type) or isinstance(value, dict_type))):
+                print("%s%s: %s, len = %d" % (pad, attr, type(value), len(value)), file=f)
+            else:
+                fprintf(f, "%s%s: %r\n", pad, attr, value)
+        if footer is not None: print(footer, file=f)
+
+FUN, FDT, FNU, FGE, FTX = range(5) # unknown, date, number, general, text
+DATEFORMAT = FDT
+NUMBERFORMAT = FNU
+
+(
+    XL_CELL_EMPTY,
+    XL_CELL_TEXT,
+    XL_CELL_NUMBER,
+    XL_CELL_DATE,
+    XL_CELL_BOOLEAN,
+    XL_CELL_ERROR,
+    XL_CELL_BLANK, # for use in debugging, gathering stats, etc
+) = range(7)
+
+biff_text_from_num = {
+    0:  "(not BIFF)",
+    20: "2.0",
+    21: "2.1",
+    30: "3",
+    40: "4S",
+    45: "4W",
+    50: "5",
+    70: "7",
+    80: "8",
+    85: "8X",
+}
+
+#: This dictionary can be used to produce a text version of the internal codes
+#: that Excel uses for error cells.
+error_text_from_code = {
+    0x00: '#NULL!',  # Intersection of two cell ranges is empty
+    0x07: '#DIV/0!', # Division by zero
+    0x0F: '#VALUE!', # Wrong type of operand
+    0x17: '#REF!',   # Illegal or deleted cell reference
+    0x1D: '#NAME?',  # Wrong function or range name
+    0x24: '#NUM!',   # Value range overflow
+    0x2A: '#N/A',    # Argument or function not available
+}
+
+BIFF_FIRST_UNICODE = 80
+
+XL_WORKBOOK_GLOBALS = WBKBLOBAL = 0x5
+XL_WORKBOOK_GLOBALS_4W = 0x100
+XL_WORKSHEET = WRKSHEET = 0x10
+
+XL_BOUNDSHEET_WORKSHEET = 0x00
+XL_BOUNDSHEET_CHART     = 0x02
+XL_BOUNDSHEET_VB_MODULE = 0x06
+
+# XL_RK2 = 0x7e
+XL_ARRAY  = 0x0221
+XL_ARRAY2 = 0x0021
+XL_BLANK = 0x0201
+XL_BLANK_B2 = 0x01
+XL_BOF = 0x809
+XL_BOOLERR = 0x205
+XL_BOOLERR_B2 = 0x5
+XL_BOUNDSHEET = 0x85
+XL_BUILTINFMTCOUNT = 0x56
+XL_CF = 0x01B1
+XL_CODEPAGE = 0x42
+XL_COLINFO = 0x7D
+XL_COLUMNDEFAULT = 0x20 # BIFF2 only
+XL_COLWIDTH = 0x24 # BIFF2 only
+XL_CONDFMT = 0x01B0
+XL_CONTINUE = 0x3c
+XL_COUNTRY = 0x8C
+XL_DATEMODE = 0x22
+XL_DEFAULTROWHEIGHT = 0x0225
+XL_DEFCOLWIDTH = 0x55
+XL_DIMENSION = 0x200
+XL_DIMENSION2 = 0x0
+XL_EFONT = 0x45
+XL_EOF = 0x0a
+XL_EXTERNNAME = 0x23
+XL_EXTERNSHEET = 0x17
+XL_EXTSST = 0xff
+XL_FEAT11 = 0x872
+XL_FILEPASS = 0x2f
+XL_FONT = 0x31
+XL_FONT_B3B4 = 0x231
+XL_FORMAT = 0x41e
+XL_FORMAT2 = 0x1E # BIFF2, BIFF3
+XL_FORMULA = 0x6
+XL_FORMULA3 = 0x206
+XL_FORMULA4 = 0x406
+XL_GCW = 0xab
+XL_HLINK = 0x01B8
+XL_QUICKTIP = 0x0800
+XL_HORIZONTALPAGEBREAKS = 0x1b
+XL_INDEX = 0x20b
+XL_INTEGER = 0x2 # BIFF2 only
+XL_IXFE = 0x44 # BIFF2 only
+XL_LABEL = 0x204
+XL_LABEL_B2 = 0x04
+XL_LABELRANGES = 0x15f
+XL_LABELSST = 0xfd
+XL_LEFTMARGIN = 0x26
+XL_TOPMARGIN = 0x28
+XL_RIGHTMARGIN = 0x27
+XL_BOTTOMMARGIN = 0x29
+XL_HEADER = 0x14
+XL_FOOTER = 0x15
+XL_HCENTER = 0x83
+XL_VCENTER = 0x84
+XL_MERGEDCELLS = 0xE5
+XL_MSO_DRAWING = 0x00EC
+XL_MSO_DRAWING_GROUP = 0x00EB
+XL_MSO_DRAWING_SELECTION = 0x00ED
+XL_MULRK = 0xbd
+XL_MULBLANK = 0xbe
+XL_NAME = 0x18
+XL_NOTE = 0x1c
+XL_NUMBER = 0x203
+XL_NUMBER_B2 = 0x3
+XL_OBJ = 0x5D
+XL_PAGESETUP = 0xA1
+XL_PALETTE = 0x92
+XL_PANE = 0x41
+XL_PRINTGRIDLINES = 0x2B
+XL_PRINTHEADERS = 0x2A
+XL_RK = 0x27e
+XL_ROW = 0x208
+XL_ROW_B2 = 0x08
+XL_RSTRING = 0xd6
+XL_SCL = 0x00A0
+XL_SHEETHDR = 0x8F # BIFF4W only
+XL_SHEETPR = 0x81
+XL_SHEETSOFFSET = 0x8E # BIFF4W only
+XL_SHRFMLA = 0x04bc
+XL_SST = 0xfc
+XL_STANDARDWIDTH = 0x99
+XL_STRING = 0x207
+XL_STRING_B2 = 0x7
+XL_STYLE = 0x293
+XL_SUPBOOK = 0x1AE # aka EXTERNALBOOK in OOo docs
+XL_TABLEOP = 0x236
+XL_TABLEOP2 = 0x37
+XL_TABLEOP_B2 = 0x36
+XL_TXO = 0x1b6
+XL_UNCALCED = 0x5e
+XL_UNKNOWN = 0xffff
+XL_VERTICALPAGEBREAKS = 0x1a
+XL_WINDOW2    = 0x023E
+XL_WINDOW2_B2 = 0x003E
+XL_WRITEACCESS = 0x5C
+XL_WSBOOL = XL_SHEETPR
+XL_XF = 0xe0
+XL_XF2 = 0x0043 # BIFF2 version of XF record
+XL_XF3 = 0x0243 # BIFF3 version of XF record
+XL_XF4 = 0x0443 # BIFF4 version of XF record
+
+boflen = {0x0809: 8, 0x0409: 6, 0x0209: 6, 0x0009: 4}
+bofcodes = (0x0809, 0x0409, 0x0209, 0x0009)
+
+XL_FORMULA_OPCODES = (0x0006, 0x0406, 0x0206)
+
+_cell_opcode_list = [
+    XL_BOOLERR,
+    XL_FORMULA,
+    XL_FORMULA3,
+    XL_FORMULA4,
+    XL_LABEL,
+    XL_LABELSST,
+    XL_MULRK,
+    XL_NUMBER,
+    XL_RK,
+    XL_RSTRING,
+]
+_cell_opcode_dict = {}
+for _cell_opcode in _cell_opcode_list:
+    _cell_opcode_dict[_cell_opcode] = 1
+
+def is_cell_opcode(c):
+    return c in  _cell_opcode_dict
+
+def upkbits(tgt_obj, src, manifest, local_setattr=setattr):
+    for n, mask, attr in manifest:
+        local_setattr(tgt_obj, attr, (src & mask) >> n)
+
+def upkbitsL(tgt_obj, src, manifest, local_setattr=setattr, local_int=int):
+    for n, mask, attr in manifest:
+        local_setattr(tgt_obj, attr, local_int((src & mask) >> n))
+
+def unpack_string(data, pos, encoding, lenlen=1):
+    nchars = unpack('<' + 'BH'[lenlen-1], data[pos:pos+lenlen])[0]
+    pos += lenlen
+    return unicode(data[pos:pos+nchars], encoding)
+
+def unpack_string_update_pos(data, pos, encoding, lenlen=1, known_len=None):
+    if known_len is not None:
+        # On a NAME record, the length byte is detached from the front of the string.
+        nchars = known_len
+    else:
+        nchars = unpack('<' + 'BH'[lenlen-1], data[pos:pos+lenlen])[0]
+        pos += lenlen
+    newpos = pos + nchars
+    return (unicode(data[pos:newpos], encoding), newpos)
+
+def unpack_unicode(data, pos, lenlen=2):
+    "Return unicode_strg"
+    nchars = unpack('<' + 'BH'[lenlen-1], data[pos:pos+lenlen])[0]
+    if not nchars:
+        # Ambiguous whether 0-length string should have an "options" byte.
+        # Avoid crash if missing.
+        return UNICODE_LITERAL("")
+    pos += lenlen
+    options = BYTES_ORD(data[pos])
+    pos += 1
+    # phonetic = options & 0x04
+    # richtext = options & 0x08
+    if options & 0x08:
+        # rt = unpack('<H', data[pos:pos+2])[0] # unused
+        pos += 2
+    if options & 0x04:
+        # sz = unpack('<i', data[pos:pos+4])[0] # unused
+        pos += 4
+    if options & 0x01:
+        # Uncompressed UTF-16-LE
+        rawstrg = data[pos:pos+2*nchars]
+        # if DEBUG: print "nchars=%d pos=%d rawstrg=%r" % (nchars, pos, rawstrg)
+        strg = unicode(rawstrg, 'utf_16_le')
+        # pos += 2*nchars
+    else:
+        # Note: this is COMPRESSED (not ASCII!) encoding!!!
+        # Merely returning the raw bytes would work OK 99.99% of the time
+        # if the local codepage was cp1252 -- however this would rapidly go pear-shaped
+        # for other codepages so we grit our Anglocentric teeth and return Unicode :-)
+
+        strg = unicode(data[pos:pos+nchars], "latin_1")
+        # pos += nchars
+    # if richtext:
+    #     pos += 4 * rt
+    # if phonetic:
+    #     pos += sz
+    # return (strg, pos)
+    return strg
+
+def unpack_unicode_update_pos(data, pos, lenlen=2, known_len=None):
+    "Return (unicode_strg, updated value of pos)"
+    if known_len is not None:
+        # On a NAME record, the length byte is detached from the front of the string.
+        nchars = known_len
+    else:
+        nchars = unpack('<' + 'BH'[lenlen-1], data[pos:pos+lenlen])[0]
+        pos += lenlen
+    if not nchars and not data[pos:]:
+        # Zero-length string with no options byte
+        return (UNICODE_LITERAL(""), pos)
+    options = BYTES_ORD(data[pos])
+    pos += 1
+    phonetic = options & 0x04
+    richtext = options & 0x08
+    if richtext:
+        rt = unpack('<H', data[pos:pos+2])[0]
+        pos += 2
+    if phonetic:
+        sz = unpack('<i', data[pos:pos+4])[0]
+        pos += 4
+    if options & 0x01:
+        # Uncompressed UTF-16-LE
+        strg = unicode(data[pos:pos+2*nchars], 'utf_16_le')
+        pos += 2*nchars
+    else:
+        # Note: this is COMPRESSED (not ASCII!) encoding!!!
+        strg = unicode(data[pos:pos+nchars], "latin_1")
+        pos += nchars
+    if richtext:
+        pos += 4 * rt
+    if phonetic:
+        pos += sz
+    return (strg, pos)
+
+def unpack_cell_range_address_list_update_pos(output_list, data, pos, biff_version, addr_size=6):
+    # output_list is updated in situ
+    assert addr_size in (6, 8)
+    # Used to assert size == 6 if not BIFF8, but pyWLWriter writes
+    # BIFF8-only MERGEDCELLS records in a BIFF5 file!
+    n, = unpack("<H", data[pos:pos+2])
+    pos += 2
+    if n:
+        if addr_size == 6:
+            fmt = "<HHBB"
+        else:
+            fmt = "<HHHH"
+        for _unused in xrange(n):
+            ra, rb, ca, cb = unpack(fmt, data[pos:pos+addr_size])
+            output_list.append((ra, rb+1, ca, cb+1))
+            pos += addr_size
+    return pos
+
+_brecstrg = """\
+0000 DIMENSIONS_B2
+0001 BLANK_B2
+0002 INTEGER_B2_ONLY
+0003 NUMBER_B2
+0004 LABEL_B2
+0005 BOOLERR_B2
+0006 FORMULA
+0007 STRING_B2
+0008 ROW_B2
+0009 BOF_B2
+000A EOF
+000B INDEX_B2_ONLY
+000C CALCCOUNT
+000D CALCMODE
+000E PRECISION
+000F REFMODE
+0010 DELTA
+0011 ITERATION
+0012 PROTECT
+0013 PASSWORD
+0014 HEADER
+0015 FOOTER
+0016 EXTERNCOUNT
+0017 EXTERNSHEET
+0018 NAME_B2,5+
+0019 WINDOWPROTECT
+001A VERTICALPAGEBREAKS
+001B HORIZONTALPAGEBREAKS
+001C NOTE
+001D SELECTION
+001E FORMAT_B2-3
+001F BUILTINFMTCOUNT_B2
+0020 COLUMNDEFAULT_B2_ONLY
+0021 ARRAY_B2_ONLY
+0022 DATEMODE
+0023 EXTERNNAME
+0024 COLWIDTH_B2_ONLY
+0025 DEFAULTROWHEIGHT_B2_ONLY
+0026 LEFTMARGIN
+0027 RIGHTMARGIN
+0028 TOPMARGIN
+0029 BOTTOMMARGIN
+002A PRINTHEADERS
+002B PRINTGRIDLINES
+002F FILEPASS
+0031 FONT
+0032 FONT2_B2_ONLY
+0036 TABLEOP_B2
+0037 TABLEOP2_B2
+003C CONTINUE
+003D WINDOW1
+003E WINDOW2_B2
+0040 BACKUP
+0041 PANE
+0042 CODEPAGE
+0043 XF_B2
+0044 IXFE_B2_ONLY
+0045 EFONT_B2_ONLY
+004D PLS
+0051 DCONREF
+0055 DEFCOLWIDTH
+0056 BUILTINFMTCOUNT_B3-4
+0059 XCT
+005A CRN
+005B FILESHARING
+005C WRITEACCESS
+005D OBJECT
+005E UNCALCED
+005F SAVERECALC
+0063 OBJECTPROTECT
+007D COLINFO
+007E RK2_mythical_?
+0080 GUTS
+0081 WSBOOL
+0082 GRIDSET
+0083 HCENTER
+0084 VCENTER
+0085 BOUNDSHEET
+0086 WRITEPROT
+008C COUNTRY
+008D HIDEOBJ
+008E SHEETSOFFSET
+008F SHEETHDR
+0090 SORT
+0092 PALETTE
+0099 STANDARDWIDTH
+009B FILTERMODE
+009C FNGROUPCOUNT
+009D AUTOFILTERINFO
+009E AUTOFILTER
+00A0 SCL
+00A1 SETUP
+00AB GCW
+00BD MULRK
+00BE MULBLANK
+00C1 MMS
+00D6 RSTRING
+00D7 DBCELL
+00DA BOOKBOOL
+00DD SCENPROTECT
+00E0 XF
+00E1 INTERFACEHDR
+00E2 INTERFACEEND
+00E5 MERGEDCELLS
+00E9 BITMAP
+00EB MSO_DRAWING_GROUP
+00EC MSO_DRAWING
+00ED MSO_DRAWING_SELECTION
+00EF PHONETIC
+00FC SST
+00FD LABELSST
+00FF EXTSST
+013D TABID
+015F LABELRANGES
+0160 USESELFS
+0161 DSF
+01AE SUPBOOK
+01AF PROTECTIONREV4
+01B0 CONDFMT
+01B1 CF
+01B2 DVAL
+01B6 TXO
+01B7 REFRESHALL
+01B8 HLINK
+01BC PASSWORDREV4
+01BE DV
+01C0 XL9FILE
+01C1 RECALCID
+0200 DIMENSIONS
+0201 BLANK
+0203 NUMBER
+0204 LABEL
+0205 BOOLERR
+0206 FORMULA_B3
+0207 STRING
+0208 ROW
+0209 BOF
+020B INDEX_B3+
+0218 NAME
+0221 ARRAY
+0223 EXTERNNAME_B3-4
+0225 DEFAULTROWHEIGHT
+0231 FONT_B3B4
+0236 TABLEOP
+023E WINDOW2
+0243 XF_B3
+027E RK
+0293 STYLE
+0406 FORMULA_B4
+0409 BOF
+041E FORMAT
+0443 XF_B4
+04BC SHRFMLA
+0800 QUICKTIP
+0809 BOF
+0862 SHEETLAYOUT
+0867 SHEETPROTECTION
+0868 RANGEPROTECTION
+"""
+
+biff_rec_name_dict = {}
+for _buff in _brecstrg.splitlines():
+    _numh, _name = _buff.split()
+    biff_rec_name_dict[int(_numh, 16)] = _name
+del _buff, _name, _brecstrg
+
+def hex_char_dump(strg, ofs, dlen, base=0, fout=sys.stdout, unnumbered=False):
+    endpos = min(ofs + dlen, len(strg))
+    pos = ofs
+    numbered = not unnumbered
+    num_prefix = ''
+    while pos < endpos:
+        endsub = min(pos + 16, endpos)
+        substrg = strg[pos:endsub]
+        lensub = endsub - pos
+        if lensub <= 0 or lensub != len(substrg):
+            fprintf(
+                sys.stdout,
+                '??? hex_char_dump: ofs=%d dlen=%d base=%d -> endpos=%d pos=%d endsub=%d substrg=%r\n',
+                ofs, dlen, base, endpos, pos, endsub, substrg)
+            break
+        hexd = ''.join("%02x " % BYTES_ORD(c) for c in substrg)
+
+        chard = ''
+        for c in substrg:
+            c = chr(BYTES_ORD(c))
+            if c == '\0':
+                c = '~'
+            elif not (' ' <= c <= '~'):
+                c = '?'
+            chard += c
+        if numbered:
+            num_prefix = "%5d: " %  (base+pos-ofs)
+
+        fprintf(fout, "%s     %-48s %s\n", num_prefix, hexd, chard)
+        pos = endsub
+
+def biff_dump(mem, stream_offset, stream_len, base=0, fout=sys.stdout, unnumbered=False):
+    pos = stream_offset
+    stream_end = stream_offset + stream_len
+    adj = base - stream_offset
+    dummies = 0
+    numbered = not unnumbered
+    num_prefix = ''
+    while stream_end - pos >= 4:
+        rc, length = unpack('<HH', mem[pos:pos+4])
+        if rc == 0 and length == 0:
+            if mem[pos:] == b'\0' * (stream_end - pos):
+                dummies = stream_end - pos
+                savpos = pos
+                pos = stream_end
+                break
+            if dummies:
+                dummies += 4
+            else:
+                savpos = pos
+                dummies = 4
+            pos += 4
+        else:
+            if dummies:
+                if numbered:
+                    num_prefix =  "%5d: " % (adj + savpos)
+                fprintf(fout, "%s---- %d zero bytes skipped ----\n", num_prefix, dummies)
+                dummies = 0
+            recname = biff_rec_name_dict.get(rc, '<UNKNOWN>')
+            if numbered:
+                num_prefix = "%5d: " % (adj + pos)
+            fprintf(fout, "%s%04x %s len = %04x (%d)\n", num_prefix, rc, recname, length, length)
+            pos += 4
+            hex_char_dump(mem, pos, length, adj+pos, fout, unnumbered)
+            pos += length
+    if dummies:
+        if numbered:
+            num_prefix =  "%5d: " % (adj + savpos)
+        fprintf(fout, "%s---- %d zero bytes skipped ----\n", num_prefix, dummies)
+    if pos < stream_end:
+        if numbered:
+            num_prefix = "%5d: " % (adj + pos)
+        fprintf(fout, "%s---- Misc bytes at end ----\n", num_prefix)
+        hex_char_dump(mem, pos, stream_end-pos, adj + pos, fout, unnumbered)
+    elif pos > stream_end:
+        fprintf(fout, "Last dumped record has length (%d) that is too large\n", length)
+
+def biff_count_records(mem, stream_offset, stream_len, fout=sys.stdout):
+    pos = stream_offset
+    stream_end = stream_offset + stream_len
+    tally = {}
+    while stream_end - pos >= 4:
+        rc, length = unpack('<HH', mem[pos:pos+4])
+        if rc == 0 and length == 0:
+            if mem[pos:] == b'\0' * (stream_end - pos):
+                break
+            recname = "<Dummy (zero)>"
+        else:
+            recname = biff_rec_name_dict.get(rc, None)
+            if recname is None:
+                recname = "Unknown_0x%04X" % rc
+        if recname in tally:
+            tally[recname] += 1
+        else:
+            tally[recname] = 1
+        pos += length + 4
+    slist = sorted(tally.items())
+    for recname, count in slist:
+        print("%8d %s" % (count, recname), file=fout)
+
+encoding_from_codepage = {
+    1200 : 'utf_16_le',
+    10000: 'mac_roman',
+    10006: 'mac_greek', # guess
+    10007: 'mac_cyrillic', # guess
+    10029: 'mac_latin2', # guess
+    10079: 'mac_iceland', # guess
+    10081: 'mac_turkish', # guess
+    32768: 'mac_roman',
+    32769: 'cp1252',
+}
+# some more guessing, for Indic scripts
+# codepage 57000 range:
+# 2 Devanagari [0]
+# 3 Bengali [1]
+# 4 Tamil [5]
+# 5 Telegu [6]
+# 6 Assamese [1] c.f. Bengali
+# 7 Oriya [4]
+# 8 Kannada [7]
+# 9 Malayalam [8]
+# 10 Gujarati [3]
+# 11 Gurmukhi [2]
diff --git a/.venv/lib/python3.12/site-packages/xlrd/book.py b/.venv/lib/python3.12/site-packages/xlrd/book.py
new file mode 100644
index 00000000..6876a3e8
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/book.py
@@ -0,0 +1,1474 @@
+# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+
+from __future__ import print_function
+
+import struct
+
+from . import compdoc, formatting, sheet
+from .biffh import *
+from .formula import *
+from .timemachine import *
+
+try:
+    from time import perf_counter
+except ImportError:
+    # Python 2.7
+    from time import clock as perf_counter
+
+from struct import unpack
+
+empty_cell = sheet.empty_cell # for exposure to the world ...
+
+DEBUG = 0
+
+import mmap
+
+MY_EOF = 0xF00BAAA # not a 16-bit number
+
+SUPBOOK_UNK, SUPBOOK_INTERNAL, SUPBOOK_EXTERNAL, SUPBOOK_ADDIN, SUPBOOK_DDEOLE = range(5)
+
+SUPPORTED_VERSIONS = (80, 70, 50, 45, 40, 30, 21, 20)
+
+_code_from_builtin_name = {
+    "Consolidate_Area": "\x00",
+    "Auto_Open":        "\x01",
+    "Auto_Close":       "\x02",
+    "Extract":          "\x03",
+    "Database":         "\x04",
+    "Criteria":         "\x05",
+    "Print_Area":       "\x06",
+    "Print_Titles":     "\x07",
+    "Recorder":         "\x08",
+    "Data_Form":        "\x09",
+    "Auto_Activate":    "\x0A",
+    "Auto_Deactivate":  "\x0B",
+    "Sheet_Title":      "\x0C",
+    "_FilterDatabase":  "\x0D",
+}
+builtin_name_from_code = {}
+code_from_builtin_name = {}
+for _bin, _bic in _code_from_builtin_name.items():
+    _bin = UNICODE_LITERAL(_bin)
+    _bic = UNICODE_LITERAL(_bic)
+    code_from_builtin_name[_bin] = _bic
+    builtin_name_from_code[_bic] = _bin
+del _bin, _bic, _code_from_builtin_name
+
+def open_workbook_xls(filename=None,
+                      logfile=sys.stdout, verbosity=0, use_mmap=True,
+                      file_contents=None,
+                      encoding_override=None,
+                      formatting_info=False, on_demand=False, ragged_rows=False,
+                      ignore_workbook_corruption=False):
+    t0 = perf_counter()
+    bk = Book()
+    try:
+        bk.biff2_8_load(
+            filename=filename, file_contents=file_contents,
+            logfile=logfile, verbosity=verbosity, use_mmap=use_mmap,
+            encoding_override=encoding_override,
+            formatting_info=formatting_info,
+            on_demand=on_demand,
+            ragged_rows=ragged_rows,
+            ignore_workbook_corruption=ignore_workbook_corruption
+        )
+        t1 = perf_counter()
+        bk.load_time_stage_1 = t1 - t0
+        biff_version = bk.getbof(XL_WORKBOOK_GLOBALS)
+        if not biff_version:
+            raise XLRDError("Can't determine file's BIFF version")
+        if biff_version not in SUPPORTED_VERSIONS:
+            raise XLRDError(
+                "BIFF version %s is not supported"
+                % biff_text_from_num[biff_version]
+            )
+        bk.biff_version = biff_version
+        if biff_version <= 40:
+            # no workbook globals, only 1 worksheet
+            if on_demand:
+                fprintf(bk.logfile,
+                    "*** WARNING: on_demand is not supported for this Excel version.\n"
+                    "*** Setting on_demand to False.\n")
+                bk.on_demand = on_demand = False
+            bk.fake_globals_get_sheet()
+        elif biff_version == 45:
+            # worksheet(s) embedded in global stream
+            bk.parse_globals()
+            if on_demand:
+                fprintf(bk.logfile, "*** WARNING: on_demand is not supported for this Excel version.\n"
+                                    "*** Setting on_demand to False.\n")
+                bk.on_demand = on_demand = False
+        else:
+            bk.parse_globals()
+            bk._sheet_list = [None for sh in bk._sheet_names]
+            if not on_demand:
+                bk.get_sheets()
+        bk.nsheets = len(bk._sheet_list)
+        if biff_version == 45 and bk.nsheets > 1:
+            fprintf(
+                bk.logfile,
+                "*** WARNING: Excel 4.0 workbook (.XLW) file contains %d worksheets.\n"
+                "*** Book-level data will be that of the last worksheet.\n",
+                bk.nsheets
+            )
+        t2 = perf_counter()
+        bk.load_time_stage_2 = t2 - t1
+    except:
+        bk.release_resources()
+        raise
+    # normal exit
+    if not on_demand:
+        bk.release_resources()
+    return bk
+
+
+class Name(BaseObject):
+    """
+    Information relating to a named reference, formula, macro, etc.
+
+    .. note::
+
+      Name information is **not** extracted from files older than
+      Excel 5.0 (``Book.biff_version < 50``)
+    """
+    _repr_these = ['stack']
+    book = None # parent
+
+    #: 0 = Visible; 1 = Hidden
+    hidden = 0
+
+    #: 0 = Command macro; 1 = Function macro. Relevant only if macro == 1
+    func = 0
+
+    #: 0 = Sheet macro; 1 = VisualBasic macro. Relevant only if macro == 1
+    vbasic = 0
+
+    #: 0 = Standard name; 1 = Macro name
+    macro = 0
+
+    #: 0 = Simple formula; 1 = Complex formula (array formula or user defined).
+    #:
+    #: .. note:: No examples have been sighted.
+    complex = 0
+
+    #: 0 = User-defined name; 1 = Built-in name
+    #:
+    #: Common examples: ``Print_Area``, ``Print_Titles``; see OOo docs for
+    #: full list
+    builtin = 0
+
+    #: Function group. Relevant only if macro == 1; see OOo docs for values.
+    funcgroup = 0
+
+    #: 0 = Formula definition; 1 = Binary data
+    #:
+    #: .. note:: No examples have been sighted.
+    binary = 0
+
+    #: The index of this object in book.name_obj_list
+    name_index = 0
+
+    # A Unicode string. If builtin, decoded as per OOo docs.
+    name = UNICODE_LITERAL("")
+
+    #: An 8-bit string.
+    raw_formula = b''
+
+    #: ``-1``:
+    #:    The name is global (visible in all calculation sheets).
+    #: ``-2``:
+    #:    The name belongs to a macro sheet or VBA sheet.
+    #: ``-3``:
+    #:    The name is invalid.
+    #: ``0 <= scope < book.nsheets``:
+    #:    The name is local to the sheet whose index is scope.
+    scope = -1
+
+    #: The result of evaluating the formula, if any.
+    #: If no formula, or evaluation of the formula encountered problems,
+    #: the result is ``None``. Otherwise the result is a single instance of the
+    #: :class:`~xlrd.formula.Operand` class.
+    #
+    result = None
+
+    def cell(self):
+        """
+        This is a convenience method for the frequent use case where the name
+        refers to a single cell.
+
+        :returns: An instance of the :class:`~xlrd.sheet.Cell` class.
+
+        :raises xlrd.biffh.XLRDError:
+          The name is not a constant absolute reference
+          to a single cell.
+        """
+        res = self.result
+        if res:
+            # result should be an instance of the Operand class
+            kind = res.kind
+            value = res.value
+            if kind == oREF and len(value) == 1:
+                ref3d = value[0]
+                if (0 <= ref3d.shtxlo == ref3d.shtxhi - 1 and
+                        ref3d.rowxlo == ref3d.rowxhi - 1 and
+                        ref3d.colxlo == ref3d.colxhi - 1):
+                    sh = self.book.sheet_by_index(ref3d.shtxlo)
+                    return sh.cell(ref3d.rowxlo, ref3d.colxlo)
+        self.dump(
+            self.book.logfile,
+            header="=== Dump of Name object ===",
+            footer="======= End of dump =======",
+        )
+        raise XLRDError("Not a constant absolute reference to a single cell")
+
+    def area2d(self, clipped=True):
+        """
+        This is a convenience method for the use case where the name
+        refers to one rectangular area in one worksheet.
+
+        :param clipped:
+          If ``True``, the default, the returned rectangle is clipped
+          to fit in ``(0, sheet.nrows, 0, sheet.ncols)``.
+          it is guaranteed that ``0 <= rowxlo <= rowxhi <= sheet.nrows`` and
+          that the number of usable rows in the area (which may be zero) is
+          ``rowxhi - rowxlo``; likewise for columns.
+
+        :returns: a tuple ``(sheet_object, rowxlo, rowxhi, colxlo, colxhi)``.
+
+        :raises xlrd.biffh.XLRDError:
+           The name is not a constant absolute reference
+           to a single area in a single sheet.
+        """
+        res = self.result
+        if res:
+            # result should be an instance of the Operand class
+            kind = res.kind
+            value = res.value
+            if kind == oREF and len(value) == 1: # only 1 reference
+                ref3d = value[0]
+                if 0 <= ref3d.shtxlo == ref3d.shtxhi - 1: # only 1 usable sheet
+                    sh = self.book.sheet_by_index(ref3d.shtxlo)
+                    if not clipped:
+                        return sh, ref3d.rowxlo, ref3d.rowxhi, ref3d.colxlo, ref3d.colxhi
+                    rowxlo = min(ref3d.rowxlo, sh.nrows)
+                    rowxhi = max(rowxlo, min(ref3d.rowxhi, sh.nrows))
+                    colxlo = min(ref3d.colxlo, sh.ncols)
+                    colxhi = max(colxlo, min(ref3d.colxhi, sh.ncols))
+                    assert 0 <= rowxlo <= rowxhi <= sh.nrows
+                    assert 0 <= colxlo <= colxhi <= sh.ncols
+                    return sh, rowxlo, rowxhi, colxlo, colxhi
+        self.dump(
+            self.book.logfile,
+            header="=== Dump of Name object ===",
+            footer="======= End of dump =======",
+        )
+        raise XLRDError("Not a constant absolute reference to a single area in a single sheet")
+
+
+class Book(BaseObject):
+    """
+    Contents of a "workbook".
+
+    .. warning::
+
+      You should not instantiate this class yourself. You use the :class:`Book`
+      object that was returned when you called :func:`~xlrd.open_workbook`.
+    """
+
+    #: The number of worksheets present in the workbook file.
+    #: This information is available even when no sheets have yet been loaded.
+    nsheets = 0
+
+    #: Which date system was in force when this file was last saved.
+    #:
+    #: 0:
+    #:   1900 system (the Excel for Windows default).
+    #:
+    #: 1:
+    #:   1904 system (the Excel for Macintosh default).
+    #:
+    #: Defaults to 0 in case it's not specified in the file.
+    datemode = 0
+
+    #: Version of BIFF (Binary Interchange File Format) used to create the file.
+    #: Latest is 8.0 (represented here as 80), introduced with Excel 97.
+    #: Earliest supported by this module: 2.0 (represented as 20).
+    biff_version = 0
+
+    #: List containing a :class:`Name` object for each ``NAME`` record in the
+    #: workbook.
+    #:
+    #: .. versionadded:: 0.6.0
+    name_obj_list = []
+
+    #: An integer denoting the character set used for strings in this file.
+    #: For BIFF 8 and later, this will be 1200, meaning Unicode;
+    #: more precisely, UTF_16_LE.
+    #: For earlier versions, this is used to derive the appropriate Python
+    #: encoding to be used to convert to Unicode.
+    #: Examples: ``1252 -> 'cp1252'``, ``10000 -> 'mac_roman'``
+    codepage = None
+
+    #: The encoding that was derived from the codepage.
+    encoding = None
+
+    #: A tuple containing the telephone country code for:
+    #:
+    #: ``[0]``:
+    #:   the user-interface setting when the file was created.
+    #:
+    #: ``[1]``:
+    #:    the regional settings.
+    #:
+    #: Example: ``(1, 61)`` meaning ``(USA, Australia)``.
+    #:
+    #: This information may give a clue to the correct encoding for an
+    #: unknown codepage. For a long list of observed values, refer to the
+    #: OpenOffice.org documentation for the ``COUNTRY`` record.
+    countries = (0, 0)
+
+    #: What (if anything) is recorded as the name of the last user to
+    #: save the file.
+    user_name = UNICODE_LITERAL('')
+
+    #: A list of :class:`~xlrd.formatting.Font` class instances,
+    #: each corresponding to a FONT record.
+    #:
+    #: .. versionadded:: 0.6.1
+    font_list = []
+
+    #: A list of :class:`~xlrd.formatting.XF` class instances,
+    #: each corresponding to an ``XF`` record.
+    #:
+    #: .. versionadded:: 0.6.1
+    xf_list = []
+
+    #: A list of :class:`~xlrd.formatting.Format` objects, each corresponding to
+    #: a ``FORMAT`` record, in the order that they appear in the input file.
+    #: It does *not* contain builtin formats.
+    #:
+    #: If you are creating an output file using (for example) :mod:`xlwt`,
+    #: use this list.
+    #:
+    #: The collection to be used for all visual rendering purposes is
+    #: :attr:`format_map`.
+    #:
+    #: .. versionadded:: 0.6.1
+    format_list = []
+
+    ##
+    #: The mapping from :attr:`~xlrd.formatting.XF.format_key` to
+    #: :class:`~xlrd.formatting.Format` object.
+    #:
+    #: .. versionadded:: 0.6.1
+    format_map = {}
+
+    #: This provides access via name to the extended format information for
+    #: both built-in styles and user-defined styles.
+    #:
+    #: It maps ``name`` to ``(built_in, xf_index)``, where
+    #: ``name`` is either the name of a user-defined style,
+    #: or the name of one of the built-in styles. Known built-in names are
+    #: Normal, RowLevel_1 to RowLevel_7,
+    #: ColLevel_1 to ColLevel_7, Comma, Currency, Percent, "Comma [0]",
+    #: "Currency [0]", Hyperlink, and "Followed Hyperlink".
+    #:
+    #: ``built_in`` has the following meanings
+    #:
+    #: 1:
+    #:     built-in style
+    #:
+    #: 0:
+    #:     user-defined
+    #:
+    #: ``xf_index`` is an index into :attr:`Book.xf_list`.
+    #:
+    #: References: OOo docs s6.99 (``STYLE`` record); Excel UI Format/Style
+    #:
+    #: .. versionadded:: 0.6.1
+    #:
+    #: Extracted only if ``open_workbook(..., formatting_info=True)``
+    #:
+    #: .. versionadded:: 0.7.4
+    style_name_map = {}
+
+    #: This provides definitions for colour indexes. Please refer to
+    #: :ref:`palette` for an explanation
+    #: of how colours are represented in Excel.
+    #:
+    #: Colour indexes into the palette map into ``(red, green, blue)`` tuples.
+    #: "Magic" indexes e.g. ``0x7FFF`` map to ``None``.
+    #:
+    #: :attr:`colour_map` is what you need if you want to render cells on screen
+    #: or in a PDF file. If you are writing an output XLS file, use
+    #: :attr:`palette_record`.
+    #:
+    #: .. note:: Extracted only if ``open_workbook(..., formatting_info=True)``
+    #:
+    #: .. versionadded:: 0.6.1
+    colour_map = {}
+
+    #: If the user has changed any of the colours in the standard palette, the
+    #: XLS file will contain a ``PALETTE`` record with 56 (16 for Excel 4.0 and
+    #: earlier) RGB values in it, and this list will be e.g.
+    #: ``[(r0, b0, g0), ..., (r55, b55, g55)]``.
+    #: Otherwise this list will be empty. This is what you need if you are
+    #: writing an output XLS file. If you want to render cells on screen or in a
+    #: PDF file, use :attr:`colour_map`.
+    #:
+    #: .. note:: Extracted only if ``open_workbook(..., formatting_info=True)``
+    #:
+    #: .. versionadded:: 0.6.1
+    palette_record = []
+
+    #: Time in seconds to extract the XLS image as a contiguous string
+    #: (or mmap equivalent).
+    load_time_stage_1 = -1.0
+
+    #: Time in seconds to parse the data from the contiguous string
+    #: (or mmap equivalent).
+    load_time_stage_2 = -1.0
+
+    def sheets(self):
+        """
+        :returns: A list of all sheets in the book.
+
+        All sheets not already loaded will be loaded.
+        """
+        for sheetx in xrange(self.nsheets):
+            if not self._sheet_list[sheetx]:
+                self.get_sheet(sheetx)
+        return self._sheet_list[:]
+
+    def sheet_by_index(self, sheetx):
+        """
+        :param sheetx: Sheet index in ``range(nsheets)``
+        :returns: A :class:`~xlrd.sheet.Sheet`.
+        """
+        return self._sheet_list[sheetx] or self.get_sheet(sheetx)
+
+    def __iter__(self):
+        """
+        Makes iteration through sheets of a book a little more straightforward.
+        Don't free resources after use since it can be called like `list(book)`
+        """
+        for i in range(self.nsheets):
+            yield self.sheet_by_index(i)
+
+    def sheet_by_name(self, sheet_name):
+        """
+        :param sheet_name: Name of the sheet required.
+        :returns: A :class:`~xlrd.sheet.Sheet`.
+        """
+        try:
+            sheetx = self._sheet_names.index(sheet_name)
+        except ValueError:
+            raise XLRDError('No sheet named <%r>' % sheet_name)
+        return self.sheet_by_index(sheetx)
+
+    def __getitem__(self, item):
+        """
+        Allow indexing with sheet name or index.
+        :param item: Name or index of sheet enquired upon
+        :return: :class:`~xlrd.sheet.Sheet`.
+        """
+        if isinstance(item, int):
+            return self.sheet_by_index(item)
+        else:
+            return self.sheet_by_name(item)
+
+    def sheet_names(self):
+        """
+        :returns:
+          A list of the names of all the worksheets in the workbook file.
+          This information is available even when no sheets have yet been
+          loaded.
+        """
+        return self._sheet_names[:]
+
+    def sheet_loaded(self, sheet_name_or_index):
+        """
+        :param sheet_name_or_index: Name or index of sheet enquired upon
+        :returns: ``True`` if sheet is loaded, ``False`` otherwise.
+
+        .. versionadded:: 0.7.1
+        """
+        if isinstance(sheet_name_or_index, int):
+            sheetx = sheet_name_or_index
+        else:
+            try:
+                sheetx = self._sheet_names.index(sheet_name_or_index)
+            except ValueError:
+                raise XLRDError('No sheet named <%r>' % sheet_name_or_index)
+        return bool(self._sheet_list[sheetx])
+
+    def unload_sheet(self, sheet_name_or_index):
+        """
+        :param sheet_name_or_index: Name or index of sheet to be unloaded.
+
+        .. versionadded:: 0.7.1
+        """
+        if isinstance(sheet_name_or_index, int):
+            sheetx = sheet_name_or_index
+        else:
+            try:
+                sheetx = self._sheet_names.index(sheet_name_or_index)
+            except ValueError:
+                raise XLRDError('No sheet named <%r>' % sheet_name_or_index)
+        self._sheet_list[sheetx] = None
+
+    def release_resources(self):
+        """
+        This method has a dual purpose. You can call it to release
+        memory-consuming objects and (possibly) a memory-mapped file
+        (:class:`mmap.mmap` object) when you have finished loading sheets in
+        ``on_demand`` mode, but still require the :class:`Book` object to
+        examine the loaded sheets. It is also called automatically (a) when
+        :func:`~xlrd.open_workbook`
+        raises an exception and (b) if you are using a ``with`` statement, when
+        the ``with`` block is exited. Calling this method multiple times on the
+        same object has no ill effect.
+        """
+        self._resources_released = 1
+        if hasattr(self.mem, "close"):
+            # must be a mmap.mmap object
+            self.mem.close()
+        self.mem = None
+        if hasattr(self.filestr, "close"):
+            self.filestr.close()
+        self.filestr = None
+        self._sharedstrings = None
+        self._rich_text_runlist_map = None
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, exc_tb):
+        self.release_resources()
+        # return false
+
+    #: A mapping from ``(lower_case_name, scope)`` to a single :class:`Name`
+    #:  object.
+    #:
+    #: .. versionadded:: 0.6.0
+    name_and_scope_map = {}
+
+    #: A mapping from `lower_case_name` to a list of :class:`Name` objects.
+    #: The list is sorted in scope order. Typically there will be one item
+    #: (of global scope) in the list.
+    #:
+    #: .. versionadded:: 0.6.0
+    name_map = {}
+
+    def __init__(self):
+        self._sheet_list = []
+        self._sheet_names = []
+        self._sheet_visibility = [] # from BOUNDSHEET record
+        self.nsheets = 0
+        self._sh_abs_posn = [] # sheet's absolute position in the stream
+        self._sharedstrings = []
+        self._rich_text_runlist_map = {}
+        self.raw_user_name = False
+        self._sheethdr_count = 0 # BIFF 4W only
+        self.builtinfmtcount = -1 # unknown as yet. BIFF 3, 4S, 4W
+        self.initialise_format_info()
+        self._all_sheets_count = 0 # includes macro & VBA sheets
+        self._supbook_count = 0
+        self._supbook_locals_inx = None
+        self._supbook_addins_inx = None
+        self._all_sheets_map = [] # maps an all_sheets index to a calc-sheets index (or -1)
+        self._externsheet_info = []
+        self._externsheet_type_b57 = []
+        self._extnsht_name_from_num = {}
+        self._sheet_num_from_name = {}
+        self._extnsht_count = 0
+        self._supbook_types = []
+        self._resources_released = 0
+        self.addin_func_names = []
+        self.name_obj_list = []
+        self.colour_map = {}
+        self.palette_record = []
+        self.xf_list = []
+        self.style_name_map = {}
+        self.mem = b''
+        self.filestr = b''
+
+    def biff2_8_load(self, filename=None, file_contents=None,
+                     logfile=sys.stdout, verbosity=0, use_mmap=True,
+                     encoding_override=None,
+                     formatting_info=False,
+                     on_demand=False,
+                     ragged_rows=False,
+                     ignore_workbook_corruption=False
+                     ):
+        # DEBUG = 0
+        self.logfile = logfile
+        self.verbosity = verbosity
+        self.use_mmap = use_mmap
+        self.encoding_override = encoding_override
+        self.formatting_info = formatting_info
+        self.on_demand = on_demand
+        self.ragged_rows = ragged_rows
+
+        if not file_contents:
+            with open(filename, "rb") as f:
+                f.seek(0, 2) # EOF
+                size = f.tell()
+                f.seek(0, 0) # BOF
+                if size == 0:
+                    raise XLRDError("File size is 0 bytes")
+                if self.use_mmap:
+                    self.filestr = mmap.mmap(f.fileno(), size, access=mmap.ACCESS_READ)
+                    self.stream_len = size
+                else:
+                    self.filestr = f.read()
+                    self.stream_len = len(self.filestr)
+        else:
+            self.filestr = file_contents
+            self.stream_len = len(file_contents)
+
+        self.base = 0
+        if self.filestr[:8] != compdoc.SIGNATURE:
+            # got this one at the antique store
+            self.mem = self.filestr
+        else:
+            cd = compdoc.CompDoc(self.filestr, logfile=self.logfile,
+                                 ignore_workbook_corruption=ignore_workbook_corruption)
+            for qname in ['Workbook', 'Book']:
+                self.mem, self.base, self.stream_len = \
+                            cd.locate_named_stream(UNICODE_LITERAL(qname))
+                if self.mem:
+                    break
+            else:
+                raise XLRDError("Can't find workbook in OLE2 compound document")
+            del cd
+            if self.mem is not self.filestr:
+                if hasattr(self.filestr, "close"):
+                    self.filestr.close()
+                self.filestr = b''
+        self._position = self.base
+        if DEBUG:
+            print("mem: %s, base: %d, len: %d" % (type(self.mem), self.base, self.stream_len), file=self.logfile)
+
+    def initialise_format_info(self):
+        # needs to be done once per sheet for BIFF 4W :-(
+        self.format_map = {}
+        self.format_list = []
+        self.xfcount = 0
+        self.actualfmtcount = 0 # number of FORMAT records seen so far
+        self._xf_index_to_xl_type_map = {0: XL_CELL_NUMBER}
+        self._xf_epilogue_done = 0
+        self.xf_list = []
+        self.font_list = []
+
+    def get2bytes(self):
+        pos = self._position
+        buff_two = self.mem[pos:pos+2]
+        lenbuff = len(buff_two)
+        self._position += lenbuff
+        if lenbuff < 2:
+            return MY_EOF
+        lo, hi = buff_two
+        return (BYTES_ORD(hi) << 8) | BYTES_ORD(lo)
+
+    def get_record_parts(self):
+        pos = self._position
+        mem = self.mem
+        code, length = unpack('<HH', mem[pos:pos+4])
+        pos += 4
+        data = mem[pos:pos+length]
+        self._position = pos + length
+        return (code, length, data)
+
+    def get_record_parts_conditional(self, reqd_record):
+        pos = self._position
+        mem = self.mem
+        code, length = unpack('<HH', mem[pos:pos+4])
+        if code != reqd_record:
+            return (None, 0, b'')
+        pos += 4
+        data = mem[pos:pos+length]
+        self._position = pos + length
+        return (code, length, data)
+
+    def get_sheet(self, sh_number, update_pos=True):
+        if self._resources_released:
+            raise XLRDError("Can't load sheets after releasing resources.")
+        if update_pos:
+            self._position = self._sh_abs_posn[sh_number]
+        self.getbof(XL_WORKSHEET)
+        # assert biff_version == self.biff_version ### FAILS
+        # Have an example where book is v7 but sheet reports v8!!!
+        # It appears to work OK if the sheet version is ignored.
+        # Confirmed by Daniel Rentz: happens when Excel does "save as"
+        # creating an old version file; ignore version details on sheet BOF.
+        sh = sheet.Sheet(
+            self,
+            self._position,
+            self._sheet_names[sh_number],
+            sh_number,
+        )
+        sh.read(self)
+        self._sheet_list[sh_number] = sh
+        return sh
+
+    def get_sheets(self):
+        # DEBUG = 0
+        if DEBUG: print("GET_SHEETS:", self._sheet_names, self._sh_abs_posn, file=self.logfile)
+        for sheetno in xrange(len(self._sheet_names)):
+            if DEBUG: print("GET_SHEETS: sheetno =", sheetno, self._sheet_names, self._sh_abs_posn, file=self.logfile)
+            self.get_sheet(sheetno)
+
+    def fake_globals_get_sheet(self): # for BIFF 4.0 and earlier
+        formatting.initialise_book(self)
+        fake_sheet_name = UNICODE_LITERAL('Sheet 1')
+        self._sheet_names = [fake_sheet_name]
+        self._sh_abs_posn = [0]
+        self._sheet_visibility = [0] # one sheet, visible
+        self._sheet_list.append(None) # get_sheet updates _sheet_list but needs a None beforehand
+        self.get_sheets()
+
+    def handle_boundsheet(self, data):
+        # DEBUG = 1
+        bv = self.biff_version
+        self.derive_encoding()
+        if DEBUG:
+            fprintf(self.logfile, "BOUNDSHEET: bv=%d data %r\n", bv, data)
+        if bv == 45: # BIFF4W
+            #### Not documented in OOo docs ...
+            # In fact, the *only* data is the name of the sheet.
+            sheet_name = unpack_string(data, 0, self.encoding, lenlen=1)
+            visibility = 0
+            sheet_type = XL_BOUNDSHEET_WORKSHEET # guess, patch later
+            if len(self._sh_abs_posn) == 0:
+                abs_posn = self._sheetsoffset + self.base
+                # Note (a) this won't be used
+                # (b) it's the position of the SHEETHDR record
+                # (c) add 11 to get to the worksheet BOF record
+            else:
+                abs_posn = -1 # unknown
+        else:
+            offset, visibility, sheet_type = unpack('<iBB', data[0:6])
+            abs_posn = offset + self.base # because global BOF is always at posn 0 in the stream
+            if bv < BIFF_FIRST_UNICODE:
+                sheet_name = unpack_string(data, 6, self.encoding, lenlen=1)
+            else:
+                sheet_name = unpack_unicode(data, 6, lenlen=1)
+
+        if DEBUG or self.verbosity >= 2:
+            fprintf(self.logfile,
+                "BOUNDSHEET: inx=%d vis=%r sheet_name=%r abs_posn=%d sheet_type=0x%02x\n",
+                self._all_sheets_count, visibility, sheet_name, abs_posn, sheet_type)
+        self._all_sheets_count += 1
+        if sheet_type != XL_BOUNDSHEET_WORKSHEET:
+            self._all_sheets_map.append(-1)
+            descr = {
+                1: 'Macro sheet',
+                2: 'Chart',
+                6: 'Visual Basic module',
+            }.get(sheet_type, 'UNKNOWN')
+
+            if DEBUG or self.verbosity >= 1:
+                fprintf(self.logfile,
+                    "NOTE *** Ignoring non-worksheet data named %r (type 0x%02x = %s)\n",
+                    sheet_name, sheet_type, descr)
+        else:
+            snum = len(self._sheet_names)
+            self._all_sheets_map.append(snum)
+            self._sheet_names.append(sheet_name)
+            self._sh_abs_posn.append(abs_posn)
+            self._sheet_visibility.append(visibility)
+            self._sheet_num_from_name[sheet_name] = snum
+
+    def handle_builtinfmtcount(self, data):
+        ### N.B. This count appears to be utterly useless.
+        # DEBUG = 1
+        builtinfmtcount = unpack('<H', data[0:2])[0]
+        if DEBUG: fprintf(self.logfile, "BUILTINFMTCOUNT: %r\n", builtinfmtcount)
+        self.builtinfmtcount = builtinfmtcount
+
+    def derive_encoding(self):
+        if self.encoding_override:
+            self.encoding = self.encoding_override
+        elif self.codepage is None:
+            if self.biff_version < 80:
+                fprintf(self.logfile,
+                    "*** No CODEPAGE record, no encoding_override: will use 'iso-8859-1'\n")
+                self.encoding = 'iso-8859-1'
+            else:
+                self.codepage = 1200 # utf16le
+                if self.verbosity >= 2:
+                    fprintf(self.logfile, "*** No CODEPAGE record; assuming 1200 (utf_16_le)\n")
+        else:
+            codepage = self.codepage
+            if codepage in encoding_from_codepage:
+                encoding = encoding_from_codepage[codepage]
+            elif 300 <= codepage <= 1999:
+                encoding = 'cp' + str(codepage)
+            elif self.biff_version >= 80:
+                self.codepage = 1200
+                encoding = 'utf_16_le'
+            else:
+                encoding = 'unknown_codepage_' + str(codepage)
+            if DEBUG or (self.verbosity and encoding != self.encoding) :
+                fprintf(self.logfile, "CODEPAGE: codepage %r -> encoding %r\n", codepage, encoding)
+            self.encoding = encoding
+        if self.codepage != 1200: # utf_16_le
+            # If we don't have a codec that can decode ASCII into Unicode,
+            # we're well & truly stuffed -- let the punter know ASAP.
+            try:
+                unicode(b'trial', self.encoding)
+            except BaseException as e:
+                fprintf(self.logfile,
+                    "ERROR *** codepage %r -> encoding %r -> %s: %s\n",
+                    self.codepage, self.encoding, type(e).__name__.split(".")[-1], e)
+                raise
+        if self.raw_user_name:
+            strg = unpack_string(self.user_name, 0, self.encoding, lenlen=1)
+            strg = strg.rstrip()
+            # if DEBUG:
+            #     print "CODEPAGE: user name decoded from %r to %r" % (self.user_name, strg)
+            self.user_name = strg
+            self.raw_user_name = False
+        return self.encoding
+
+    def handle_codepage(self, data):
+        # DEBUG = 0
+        codepage = unpack('<H', data[0:2])[0]
+        self.codepage = codepage
+        self.derive_encoding()
+
+    def handle_country(self, data):
+        countries = unpack('<HH', data[0:4])
+        if self.verbosity: print("Countries:", countries, file=self.logfile)
+        # Note: in BIFF7 and earlier, country record was put (redundantly?) in each worksheet.
+        assert self.countries == (0, 0) or self.countries == countries
+        self.countries = countries
+
+    def handle_datemode(self, data):
+        datemode = unpack('<H', data[0:2])[0]
+        if DEBUG or self.verbosity:
+            fprintf(self.logfile, "DATEMODE: datemode %r\n", datemode)
+        assert datemode in (0, 1)
+        self.datemode = datemode
+
+    def handle_externname(self, data):
+        blah = DEBUG or self.verbosity >= 2
+        if self.biff_version >= 80:
+            option_flags, other_info =unpack("<HI", data[:6])
+            pos = 6
+            name, pos = unpack_unicode_update_pos(data, pos, lenlen=1)
+            extra = data[pos:]
+            if self._supbook_types[-1] == SUPBOOK_ADDIN:
+                self.addin_func_names.append(name)
+            if blah:
+                fprintf(self.logfile,
+                    "EXTERNNAME: sbktype=%d oflags=0x%04x oinfo=0x%08x name=%r extra=%r\n",
+                    self._supbook_types[-1], option_flags, other_info, name, extra)
+
+    def handle_externsheet(self, data):
+        self.derive_encoding() # in case CODEPAGE record missing/out of order/wrong
+        self._extnsht_count += 1 # for use as a 1-based index
+        blah1 = DEBUG or self.verbosity >= 1
+        blah2 = DEBUG or self.verbosity >= 2
+        if self.biff_version >= 80:
+            num_refs = unpack("<H", data[0:2])[0]
+            bytes_reqd = num_refs * 6 + 2
+            while len(data) < bytes_reqd:
+                if blah1:
+                    fprintf(
+                        self.logfile,
+                        "INFO: EXTERNSHEET needs %d bytes, have %d\n",
+                        bytes_reqd, len(data),
+                    )
+                code2, length2, data2 = self.get_record_parts()
+                if code2 != XL_CONTINUE:
+                    raise XLRDError("Missing CONTINUE after EXTERNSHEET record")
+                data += data2
+            pos = 2
+            for k in xrange(num_refs):
+                info = unpack("<HHH", data[pos:pos+6])
+                ref_recordx, ref_first_sheetx, ref_last_sheetx = info
+                self._externsheet_info.append(info)
+                pos += 6
+                if blah2:
+                    fprintf(
+                        self.logfile,
+                        "EXTERNSHEET(b8): k = %2d, record = %2d, first_sheet = %5d, last sheet = %5d\n",
+                        k, ref_recordx, ref_first_sheetx, ref_last_sheetx,
+                    )
+        else:
+            nc, ty = unpack("<BB", data[:2])
+            if blah2:
+                print("EXTERNSHEET(b7-):", file=self.logfile)
+                hex_char_dump(data, 0, len(data), fout=self.logfile)
+                msg = {
+                    1: "Encoded URL",
+                    2: "Current sheet!!",
+                    3: "Specific sheet in own doc't",
+                    4: "Nonspecific sheet in own doc't!!",
+                }.get(ty, "Not encoded")
+                print("   %3d chars, type is %d (%s)" % (nc, ty, msg), file=self.logfile)
+            if ty == 3:
+                sheet_name = unicode(data[2:nc+2], self.encoding)
+                self._extnsht_name_from_num[self._extnsht_count] = sheet_name
+                if blah2: print(self._extnsht_name_from_num, file=self.logfile)
+            if not (1 <= ty <= 4):
+                ty = 0
+            self._externsheet_type_b57.append(ty)
+
+    def handle_filepass(self, data):
+        if self.verbosity >= 2:
+            logf = self.logfile
+            fprintf(logf, "FILEPASS:\n")
+            hex_char_dump(data, 0, len(data), base=0, fout=logf)
+            if self.biff_version >= 80:
+                kind1, = unpack('<H', data[:2])
+                if kind1 == 0: # weak XOR encryption
+                    key, hash_value = unpack('<HH', data[2:])
+                    fprintf(logf,
+                        'weak XOR: key=0x%04x hash=0x%04x\n',
+                        key, hash_value)
+                elif kind1 == 1:
+                    kind2, = unpack('<H', data[4:6])
+                    if kind2 == 1: # BIFF8 standard encryption
+                        caption = "BIFF8 std"
+                    elif kind2 == 2:
+                        caption = "BIFF8 strong"
+                    else:
+                        caption = "** UNKNOWN ENCRYPTION METHOD **"
+                    fprintf(logf, "%s\n", caption)
+        raise XLRDError("Workbook is encrypted")
+
+    def handle_name(self, data):
+        blah = DEBUG or self.verbosity >= 2
+        bv = self.biff_version
+        if bv < 50:
+            return
+        self.derive_encoding()
+        # print
+        # hex_char_dump(data, 0, len(data), fout=self.logfile)
+        (
+            option_flags, kb_shortcut, name_len, fmla_len, extsht_index, sheet_index,
+            menu_text_len, description_text_len, help_topic_text_len, status_bar_text_len,
+        ) = unpack("<HBBHHH4B", data[0:14])
+        nobj = Name()
+        nobj.book = self ### CIRCULAR ###
+        name_index = len(self.name_obj_list)
+        nobj.name_index = name_index
+        self.name_obj_list.append(nobj)
+        nobj.option_flags = option_flags
+        attrs = [
+            ('hidden', 1, 0),
+            ('func', 2, 1),
+            ('vbasic', 4, 2),
+            ('macro', 8, 3),
+            ('complex', 0x10, 4),
+            ('builtin', 0x20, 5),
+            ('funcgroup', 0xFC0, 6),
+            ('binary', 0x1000, 12),
+        ]
+        for attr, mask, nshift in attrs:
+            setattr(nobj, attr, (option_flags & mask) >> nshift)
+
+        macro_flag = " M"[nobj.macro]
+        if bv < 80:
+            internal_name, pos = unpack_string_update_pos(data, 14, self.encoding, known_len=name_len)
+        else:
+            internal_name, pos = unpack_unicode_update_pos(data, 14, known_len=name_len)
+        nobj.extn_sheet_num = extsht_index
+        nobj.excel_sheet_index = sheet_index
+        nobj.scope = None # patched up in the names_epilogue() method
+        if blah:
+            fprintf(
+                self.logfile,
+                "NAME[%d]:%s oflags=%d, name_len=%d, fmla_len=%d, extsht_index=%d, sheet_index=%d, name=%r\n",
+                name_index, macro_flag, option_flags, name_len,
+                fmla_len, extsht_index, sheet_index, internal_name)
+        name = internal_name
+        if nobj.builtin:
+            name = builtin_name_from_code.get(name, "??Unknown??")
+            if blah: print("    builtin: %s" % name, file=self.logfile)
+        nobj.name = name
+        nobj.raw_formula = data[pos:]
+        nobj.basic_formula_len = fmla_len
+        nobj.evaluated = 0
+        if blah:
+            nobj.dump(
+                self.logfile,
+                header="--- handle_name: name[%d] ---" % name_index,
+                footer="-------------------",
+            )
+
+    def names_epilogue(self):
+        blah = self.verbosity >= 2
+        f = self.logfile
+        if blah:
+            print("+++++ names_epilogue +++++", file=f)
+            print("_all_sheets_map", REPR(self._all_sheets_map), file=f)
+            print("_extnsht_name_from_num", REPR(self._extnsht_name_from_num), file=f)
+            print("_sheet_num_from_name", REPR(self._sheet_num_from_name), file=f)
+        num_names = len(self.name_obj_list)
+        for namex in range(num_names):
+            nobj = self.name_obj_list[namex]
+            # Convert from excel_sheet_index to scope.
+            # This is done here because in BIFF7 and earlier, the
+            # BOUNDSHEET records (from which _all_sheets_map is derived)
+            # come after the NAME records.
+            if self.biff_version >= 80:
+                sheet_index = nobj.excel_sheet_index
+                if sheet_index == 0:
+                    intl_sheet_index = -1 # global
+                elif 1 <= sheet_index <= len(self._all_sheets_map):
+                    intl_sheet_index = self._all_sheets_map[sheet_index-1]
+                    if intl_sheet_index == -1: # maps to a macro or VBA sheet
+                        intl_sheet_index = -2 # valid sheet reference but not useful
+                else:
+                    # huh?
+                    intl_sheet_index = -3 # invalid
+            elif 50 <= self.biff_version <= 70:
+                sheet_index = nobj.extn_sheet_num
+                if sheet_index == 0:
+                    intl_sheet_index = -1 # global
+                else:
+                    sheet_name = self._extnsht_name_from_num[sheet_index]
+                    intl_sheet_index = self._sheet_num_from_name.get(sheet_name, -2)
+            nobj.scope = intl_sheet_index
+
+        for namex in range(num_names):
+            nobj = self.name_obj_list[namex]
+            # Parse the formula ...
+            if nobj.macro or nobj.binary: continue
+            if nobj.evaluated: continue
+            evaluate_name_formula(self, nobj, namex, blah=blah)
+
+        if self.verbosity >= 2:
+            print("---------- name object dump ----------", file=f)
+            for namex in range(num_names):
+                nobj = self.name_obj_list[namex]
+                nobj.dump(f, header="--- name[%d] ---" % namex)
+            print("--------------------------------------", file=f)
+        #
+        # Build some dicts for access to the name objects
+        #
+        name_and_scope_map = {} # (name.lower(), scope): Name_object
+        name_map = {}           # name.lower() : list of Name_objects (sorted in scope order)
+        for namex in range(num_names):
+            nobj = self.name_obj_list[namex]
+            name_lcase = nobj.name.lower()
+            key = (name_lcase, nobj.scope)
+            if key in name_and_scope_map and self.verbosity:
+                fprintf(f, 'Duplicate entry %r in name_and_scope_map\n', key)
+            name_and_scope_map[key] = nobj
+            sort_data = (nobj.scope, namex, nobj)
+            # namex (a temp unique ID) ensures the Name objects will not
+            # be compared (fatal in py3)
+            if name_lcase in name_map:
+                name_map[name_lcase].append(sort_data)
+            else:
+                name_map[name_lcase] = [sort_data]
+        for key in name_map.keys():
+            alist = name_map[key]
+            alist.sort()
+            name_map[key] = [x[2] for x in alist]
+        self.name_and_scope_map = name_and_scope_map
+        self.name_map = name_map
+
+    def handle_obj(self, data):
+        # Not doing much handling at all.
+        # Worrying about embedded (BOF ... EOF) substreams is done elsewhere.
+        # DEBUG = 1
+        obj_type, obj_id = unpack('<HI', data[4:10])
+        # if DEBUG: print "---> handle_obj type=%d id=0x%08x" % (obj_type, obj_id)
+
+    def handle_supbook(self, data):
+        # aka EXTERNALBOOK in OOo docs
+        self._supbook_types.append(None)
+        blah = DEBUG or self.verbosity >= 2
+        if blah:
+            print("SUPBOOK:", file=self.logfile)
+            hex_char_dump(data, 0, len(data), fout=self.logfile)
+        num_sheets = unpack("<H", data[0:2])[0]
+        if blah: print("num_sheets = %d" % num_sheets, file=self.logfile)
+        sbn = self._supbook_count
+        self._supbook_count += 1
+        if data[2:4] == b"\x01\x04":
+            self._supbook_types[-1] = SUPBOOK_INTERNAL
+            self._supbook_locals_inx = self._supbook_count - 1
+            if blah:
+                print("SUPBOOK[%d]: internal 3D refs; %d sheets" % (sbn, num_sheets), file=self.logfile)
+                print("    _all_sheets_map", self._all_sheets_map, file=self.logfile)
+            return
+        if data[0:4] == b"\x01\x00\x01\x3A":
+            self._supbook_types[-1] = SUPBOOK_ADDIN
+            self._supbook_addins_inx = self._supbook_count - 1
+            if blah: print("SUPBOOK[%d]: add-in functions" % sbn, file=self.logfile)
+            return
+        url, pos = unpack_unicode_update_pos(data, 2, lenlen=2)
+        if num_sheets == 0:
+            self._supbook_types[-1] = SUPBOOK_DDEOLE
+            if blah: fprintf(self.logfile, "SUPBOOK[%d]: DDE/OLE document = %r\n", sbn, url)
+            return
+        self._supbook_types[-1] = SUPBOOK_EXTERNAL
+        if blah: fprintf(self.logfile, "SUPBOOK[%d]: url = %r\n", sbn, url)
+        sheet_names = []
+        for x in range(num_sheets):
+            try:
+                shname, pos = unpack_unicode_update_pos(data, pos, lenlen=2)
+            except struct.error:
+                # #### FIX ME ####
+                # Should implement handling of CONTINUE record(s) ...
+                if self.verbosity:
+                    print(
+                        "*** WARNING: unpack failure in sheet %d of %d in SUPBOOK record for file %r"
+                        % (x, num_sheets, url),
+                        file=self.logfile,
+                    )
+                break
+            sheet_names.append(shname)
+            if blah: fprintf(self.logfile, "  sheetx=%d namelen=%d name=%r (next pos=%d)\n", x, len(shname), shname, pos)
+
+    def handle_sheethdr(self, data):
+        # This a BIFF 4W special.
+        # The SHEETHDR record is followed by a (BOF ... EOF) substream containing
+        # a worksheet.
+        # DEBUG = 1
+        self.derive_encoding()
+        sheet_len = unpack('<i', data[:4])[0]
+        sheet_name = unpack_string(data, 4, self.encoding, lenlen=1)
+        sheetno = self._sheethdr_count
+        assert sheet_name == self._sheet_names[sheetno]
+        self._sheethdr_count += 1
+        BOF_posn = self._position
+        posn = BOF_posn - 4 - len(data)
+        if DEBUG: fprintf(self.logfile, 'SHEETHDR %d at posn %d: len=%d name=%r\n', sheetno, posn, sheet_len, sheet_name)
+        self.initialise_format_info()
+        if DEBUG: print('SHEETHDR: xf epilogue flag is %d' % self._xf_epilogue_done, file=self.logfile)
+        self._sheet_list.append(None) # get_sheet updates _sheet_list but needs a None beforehand
+        self.get_sheet(sheetno, update_pos=False)
+        if DEBUG: print('SHEETHDR: posn after get_sheet() =', self._position, file=self.logfile)
+        self._position = BOF_posn + sheet_len
+
+    def handle_sheetsoffset(self, data):
+        # DEBUG = 0
+        posn = unpack('<i', data)[0]
+        if DEBUG: print('SHEETSOFFSET:', posn, file=self.logfile)
+        self._sheetsoffset = posn
+
+    def handle_sst(self, data):
+        # DEBUG = 1
+        if DEBUG:
+            print("SST Processing", file=self.logfile)
+            t0 = perf_counter()
+        nbt = len(data)
+        strlist = [data]
+        uniquestrings = unpack('<i', data[4:8])[0]
+        if DEBUG  or self.verbosity >= 2:
+            fprintf(self.logfile, "SST: unique strings: %d\n", uniquestrings)
+        while 1:
+            code, nb, data = self.get_record_parts_conditional(XL_CONTINUE)
+            if code is None:
+                break
+            nbt += nb
+            if DEBUG >= 2:
+                fprintf(self.logfile, "CONTINUE: adding %d bytes to SST -> %d\n", nb, nbt)
+            strlist.append(data)
+        self._sharedstrings, rt_runlist = unpack_SST_table(strlist, uniquestrings)
+        if self.formatting_info:
+            self._rich_text_runlist_map = rt_runlist
+        if DEBUG:
+            t1 = perf_counter()
+            print("SST processing took %.2f seconds" % (t1 - t0, ), file=self.logfile)
+
+    def handle_writeaccess(self, data):
+        DEBUG = 0
+        if self.biff_version < 80:
+            if not self.encoding:
+                self.raw_user_name = True
+                self.user_name = data
+                return
+            strg = unpack_string(data, 0, self.encoding, lenlen=1)
+        else:
+            try:
+                strg = unpack_unicode(data, 0, lenlen=2)
+            except UnicodeDecodeError:
+                # may have invalid trailing characters
+                strg = unpack_unicode(data.strip(), 0, lenlen=2)
+        if DEBUG: fprintf(self.logfile, "WRITEACCESS: %d bytes; raw=%s %r\n", len(data), self.raw_user_name, strg)
+        strg = strg.rstrip()
+        self.user_name = strg
+
+    def parse_globals(self):
+        # DEBUG = 0
+        # no need to position, just start reading (after the BOF)
+        formatting.initialise_book(self)
+        while 1:
+            rc, length, data = self.get_record_parts()
+            if DEBUG: print("parse_globals: record code is 0x%04x" % rc, file=self.logfile)
+            if rc == XL_SST:
+                self.handle_sst(data)
+            elif rc == XL_FONT or rc == XL_FONT_B3B4:
+                self.handle_font(data)
+            elif rc == XL_FORMAT: # XL_FORMAT2 is BIFF <= 3.0, can't appear in globals
+                self.handle_format(data)
+            elif rc == XL_XF:
+                self.handle_xf(data)
+            elif rc ==  XL_BOUNDSHEET:
+                self.handle_boundsheet(data)
+            elif rc == XL_DATEMODE:
+                self.handle_datemode(data)
+            elif rc == XL_CODEPAGE:
+                self.handle_codepage(data)
+            elif rc == XL_COUNTRY:
+                self.handle_country(data)
+            elif rc == XL_EXTERNNAME:
+                self.handle_externname(data)
+            elif rc == XL_EXTERNSHEET:
+                self.handle_externsheet(data)
+            elif rc == XL_FILEPASS:
+                self.handle_filepass(data)
+            elif rc == XL_WRITEACCESS:
+                self.handle_writeaccess(data)
+            elif rc == XL_SHEETSOFFSET:
+                self.handle_sheetsoffset(data)
+            elif rc == XL_SHEETHDR:
+                self.handle_sheethdr(data)
+            elif rc == XL_SUPBOOK:
+                self.handle_supbook(data)
+            elif rc == XL_NAME:
+                self.handle_name(data)
+            elif rc == XL_PALETTE:
+                self.handle_palette(data)
+            elif rc == XL_STYLE:
+                self.handle_style(data)
+            elif rc & 0xff == 9 and self.verbosity:
+                fprintf(self.logfile, "*** Unexpected BOF at posn %d: 0x%04x len=%d data=%r\n",
+                    self._position - length - 4, rc, length, data)
+            elif rc ==  XL_EOF:
+                self.xf_epilogue()
+                self.names_epilogue()
+                self.palette_epilogue()
+                if not self.encoding:
+                    self.derive_encoding()
+                if self.biff_version == 45:
+                    # DEBUG = 0
+                    if DEBUG: print("global EOF: position", self._position, file=self.logfile)
+                    # if DEBUG:
+                    #     pos = self._position - 4
+                    #     print repr(self.mem[pos:pos+40])
+                return
+            else:
+                # if DEBUG:
+                #     print >> self.logfile, "parse_globals: ignoring record code 0x%04x" % rc
+                pass
+
+    def read(self, pos, length):
+        data = self.mem[pos:pos+length]
+        self._position = pos + len(data)
+        return data
+
+    def getbof(self, rqd_stream):
+        # DEBUG = 1
+        # if DEBUG: print >> self.logfile, "getbof(): position", self._position
+        if DEBUG: print("reqd: 0x%04x" % rqd_stream, file=self.logfile)
+
+        def bof_error(msg):
+            raise XLRDError('Unsupported format, or corrupt file: ' + msg)
+        savpos = self._position
+        opcode = self.get2bytes()
+        if opcode == MY_EOF:
+            bof_error('Expected BOF record; met end of file')
+        if opcode not in bofcodes:
+            bof_error('Expected BOF record; found %r' % self.mem[savpos:savpos+8])
+        length = self.get2bytes()
+        if length == MY_EOF:
+            bof_error('Incomplete BOF record[1]; met end of file')
+        if not (4 <= length <= 20):
+            bof_error(
+                'Invalid length (%d) for BOF record type 0x%04x'
+                % (length, opcode))
+        padding = b'\0' * max(0, boflen[opcode] - length)
+        data = self.read(self._position, length)
+        if DEBUG: fprintf(self.logfile, "\ngetbof(): data=%r\n", data)
+        if len(data) < length:
+            bof_error('Incomplete BOF record[2]; met end of file')
+        data += padding
+        version1 = opcode >> 8
+        version2, streamtype = unpack('<HH', data[0:4])
+        if DEBUG:
+            print("getbof(): op=0x%04x version2=0x%04x streamtype=0x%04x"
+                % (opcode, version2, streamtype), file=self.logfile)
+        bof_offset = self._position - 4 - length
+        if DEBUG:
+            print("getbof(): BOF found at offset %d; savpos=%d"
+                % (bof_offset, savpos), file=self.logfile)
+        version = build = year = 0
+        if version1 == 0x08:
+            build, year = unpack('<HH', data[4:8])
+            if version2 == 0x0600:
+                version = 80
+            elif version2 == 0x0500:
+                if year < 1994 or build in (2412, 3218, 3321):
+                    version = 50
+                else:
+                    version = 70
+            else:
+                # dodgy one, created by a 3rd-party tool
+                version = {
+                    0x0000: 21,
+                    0x0007: 21,
+                    0x0200: 21,
+                    0x0300: 30,
+                    0x0400: 40,
+                }.get(version2, 0)
+        elif version1 in (0x04, 0x02, 0x00):
+            version = {0x04: 40, 0x02: 30, 0x00: 21}[version1]
+
+        if version == 40 and streamtype == XL_WORKBOOK_GLOBALS_4W:
+            version = 45 # i.e. 4W
+
+        if DEBUG or self.verbosity >= 2:
+            print("BOF: op=0x%04x vers=0x%04x stream=0x%04x buildid=%d buildyr=%d -> BIFF%d"
+                % (opcode, version2, streamtype, build, year, version), file=self.logfile)
+        got_globals = streamtype == XL_WORKBOOK_GLOBALS or (
+            version == 45 and streamtype == XL_WORKBOOK_GLOBALS_4W)
+        if (rqd_stream == XL_WORKBOOK_GLOBALS and got_globals) or streamtype == rqd_stream:
+            return version
+        if version < 50 and streamtype == XL_WORKSHEET:
+            return version
+        if version >= 50 and streamtype == 0x0100:
+            bof_error("Workspace file -- no spreadsheet data")
+        bof_error(
+            'BOF not workbook/worksheet: op=0x%04x vers=0x%04x strm=0x%04x build=%d year=%d -> BIFF%d'
+            % (opcode, version2, streamtype, build, year, version)
+        )
+
+# === helper functions
+
+def expand_cell_address(inrow, incol):
+    # Ref : OOo docs, "4.3.4 Cell Addresses in BIFF8"
+    outrow = inrow
+    if incol & 0x8000:
+        if outrow >= 32768:
+            outrow -= 65536
+        relrow = 1
+    else:
+        relrow = 0
+    outcol = incol & 0xFF
+    if incol & 0x4000:
+        if outcol >= 128:
+            outcol -= 256
+        relcol = 1
+    else:
+        relcol = 0
+    return outrow, outcol, relrow, relcol
+
+def colname(colx, _A2Z="ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
+    assert colx >= 0
+    name = UNICODE_LITERAL('')
+    while 1:
+        quot, rem = divmod(colx, 26)
+        name = _A2Z[rem] + name
+        if not quot:
+            return name
+        colx = quot - 1
+
+def display_cell_address(rowx, colx, relrow, relcol):
+    if relrow:
+        rowpart = "(*%s%d)" % ("+-"[rowx < 0], abs(rowx))
+    else:
+        rowpart = "$%d" % (rowx+1,)
+    if relcol:
+        colpart = "(*%s%d)" % ("+-"[colx < 0], abs(colx))
+    else:
+        colpart = "$" + colname(colx)
+    return colpart + rowpart
+
+def unpack_SST_table(datatab, nstrings):
+    "Return list of strings"
+    datainx = 0
+    ndatas = len(datatab)
+    data = datatab[0]
+    datalen = len(data)
+    pos = 8
+    strings = []
+    strappend = strings.append
+    richtext_runs = {}
+    local_unpack = unpack
+    local_min = min
+    local_BYTES_ORD = BYTES_ORD
+    latin_1 = "latin_1"
+    for _unused_i in xrange(nstrings):
+        nchars = local_unpack('<H', data[pos:pos+2])[0]
+        pos += 2
+        options = local_BYTES_ORD(data[pos])
+        pos += 1
+        rtcount = 0
+        phosz = 0
+        if options & 0x08: # richtext
+            rtcount = local_unpack('<H', data[pos:pos+2])[0]
+            pos += 2
+        if options & 0x04: # phonetic
+            phosz = local_unpack('<i', data[pos:pos+4])[0]
+            pos += 4
+        accstrg = UNICODE_LITERAL('')
+        charsgot = 0
+        while 1:
+            charsneed = nchars - charsgot
+            if options & 0x01:
+                # Uncompressed UTF-16
+                charsavail = local_min((datalen - pos) >> 1, charsneed)
+                rawstrg = data[pos:pos+2*charsavail]
+                # if DEBUG: print "SST U16: nchars=%d pos=%d rawstrg=%r" % (nchars, pos, rawstrg)
+                try:
+                    accstrg += unicode(rawstrg, "utf_16_le")
+                except:
+                    # print "SST U16: nchars=%d pos=%d rawstrg=%r" % (nchars, pos, rawstrg)
+                    # Probable cause: dodgy data e.g. unfinished surrogate pair.
+                    # E.g. file unicode2.xls in pyExcelerator's examples has cells containing
+                    # unichr(i) for i in range(0x100000)
+                    # so this will include 0xD800 etc
+                    raise
+                pos += 2*charsavail
+            else:
+                # Note: this is COMPRESSED (not ASCII!) encoding!!!
+                charsavail = local_min(datalen - pos, charsneed)
+                rawstrg = data[pos:pos+charsavail]
+                # if DEBUG: print "SST CMPRSD: nchars=%d pos=%d rawstrg=%r" % (nchars, pos, rawstrg)
+                accstrg += unicode(rawstrg, latin_1)
+                pos += charsavail
+            charsgot += charsavail
+            if charsgot == nchars:
+                break
+            datainx += 1
+            data = datatab[datainx]
+            datalen = len(data)
+            options = local_BYTES_ORD(data[0])
+            pos = 1
+
+        if rtcount:
+            runs = []
+            for runindex in xrange(rtcount):
+                if pos == datalen:
+                    pos = 0
+                    datainx += 1
+                    data = datatab[datainx]
+                    datalen = len(data)
+                runs.append(local_unpack("<HH", data[pos:pos+4]))
+                pos += 4
+            richtext_runs[len(strings)] = runs
+
+        pos += phosz # size of the phonetic stuff to skip
+        if pos >= datalen:
+            # adjust to correct position in next record
+            pos = pos - datalen
+            datainx += 1
+            if datainx < ndatas:
+                data = datatab[datainx]
+                datalen = len(data)
+            else:
+                assert _unused_i == nstrings - 1
+        strappend(accstrg)
+    return strings, richtext_runs
diff --git a/.venv/lib/python3.12/site-packages/xlrd/compdoc.py b/.venv/lib/python3.12/site-packages/xlrd/compdoc.py
new file mode 100644
index 00000000..412a89e7
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/compdoc.py
@@ -0,0 +1,485 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+# No part of the content of this file was derived from the works of
+# David Giffin.
+"""
+Implements the minimal functionality required
+to extract a "Workbook" or "Book" stream (as one big string)
+from an OLE2 Compound Document file.
+"""
+from __future__ import print_function
+
+import array
+import sys
+from struct import unpack
+
+from .timemachine import *
+
+#: Magic cookie that should appear in the first 8 bytes of the file.
+SIGNATURE = b"\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1"
+
+EOCSID = -2
+FREESID = -1
+SATSID = -3
+MSATSID = -4
+EVILSID = -5
+
+class CompDocError(Exception):
+    pass
+
+class DirNode(object):
+
+    def __init__(self, DID, dent, DEBUG=0, logfile=sys.stdout):
+        # dent is the 128-byte directory entry
+        self.DID = DID
+        self.logfile = logfile
+        (cbufsize, self.etype, self.colour, self.left_DID, self.right_DID,
+        self.root_DID) = \
+            unpack('<HBBiii', dent[64:80])
+        (self.first_SID, self.tot_size) = \
+            unpack('<ii', dent[116:124])
+        if cbufsize == 0:
+            self.name = UNICODE_LITERAL('')
+        else:
+            self.name = unicode(dent[0:cbufsize-2], 'utf_16_le') # omit the trailing U+0000
+        self.children = [] # filled in later
+        self.parent = -1 # indicates orphan; fixed up later
+        self.tsinfo = unpack('<IIII', dent[100:116])
+        if DEBUG:
+            self.dump(DEBUG)
+
+    def dump(self, DEBUG=1):
+        fprintf(
+            self.logfile,
+            "DID=%d name=%r etype=%d DIDs(left=%d right=%d root=%d parent=%d kids=%r) first_SID=%d tot_size=%d\n",
+            self.DID, self.name, self.etype, self.left_DID,
+            self.right_DID, self.root_DID, self.parent, self.children, self.first_SID, self.tot_size
+        )
+        if DEBUG == 2:
+            # cre_lo, cre_hi, mod_lo, mod_hi = tsinfo
+            print("timestamp info", self.tsinfo, file=self.logfile)
+
+def _build_family_tree(dirlist, parent_DID, child_DID):
+    if child_DID < 0: return
+    _build_family_tree(dirlist, parent_DID, dirlist[child_DID].left_DID)
+    dirlist[parent_DID].children.append(child_DID)
+    dirlist[child_DID].parent = parent_DID
+    _build_family_tree(dirlist, parent_DID, dirlist[child_DID].right_DID)
+    if dirlist[child_DID].etype == 1: # storage
+        _build_family_tree(dirlist, child_DID, dirlist[child_DID].root_DID)
+
+
+class CompDoc(object):
+    """
+    Compound document handler.
+
+    :param mem:
+      The raw contents of the file, as a string, or as an :class:`mmap.mmap`
+      object. The only operation it needs to support is slicing.
+    """
+
+
+    def __init__(self, mem, logfile=sys.stdout, DEBUG=0, ignore_workbook_corruption=False):
+        self.logfile = logfile
+        self.ignore_workbook_corruption = ignore_workbook_corruption
+        self.DEBUG = DEBUG
+        if mem[0:8] != SIGNATURE:
+            raise CompDocError('Not an OLE2 compound document')
+        if mem[28:30] != b'\xFE\xFF':
+            raise CompDocError('Expected "little-endian" marker, found %r' % mem[28:30])
+        revision, version = unpack('<HH', mem[24:28])
+        if DEBUG:
+            print("\nCompDoc format: version=0x%04x revision=0x%04x" % (version, revision), file=logfile)
+        self.mem = mem
+        ssz, sssz = unpack('<HH', mem[30:34])
+        if ssz > 20: # allows for 2**20 bytes i.e. 1MB
+            print("WARNING: sector size (2**%d) is preposterous; assuming 512 and continuing ..."
+                % ssz, file=logfile)
+            ssz = 9
+        if sssz > ssz:
+            print("WARNING: short stream sector size (2**%d) is preposterous; assuming 64 and continuing ..."
+                % sssz, file=logfile)
+            sssz = 6
+        self.sec_size = sec_size = 1 << ssz
+        self.short_sec_size = 1 << sssz
+        if self.sec_size != 512 or self.short_sec_size != 64:
+            print("@@@@ sec_size=%d short_sec_size=%d" % (self.sec_size, self.short_sec_size), file=logfile)
+        (
+            SAT_tot_secs, self.dir_first_sec_sid, _unused, self.min_size_std_stream,
+            SSAT_first_sec_sid, SSAT_tot_secs,
+            MSATX_first_sec_sid, MSATX_tot_secs,
+        ) = unpack('<iiiiiiii', mem[44:76])
+        mem_data_len = len(mem) - 512
+        mem_data_secs, left_over = divmod(mem_data_len, sec_size)
+        if left_over:
+            #### raise CompDocError("Not a whole number of sectors")
+            mem_data_secs += 1
+            print("WARNING *** file size (%d) not 512 + multiple of sector size (%d)"
+                % (len(mem), sec_size), file=logfile)
+        self.mem_data_secs = mem_data_secs # use for checking later
+        self.mem_data_len = mem_data_len
+        seen = self.seen = array.array('B', [0]) * mem_data_secs
+
+        if DEBUG:
+            print('sec sizes', ssz, sssz, sec_size, self.short_sec_size, file=logfile)
+            print("mem data: %d bytes == %d sectors" % (mem_data_len, mem_data_secs), file=logfile)
+            print("SAT_tot_secs=%d, dir_first_sec_sid=%d, min_size_std_stream=%d"
+                % (SAT_tot_secs, self.dir_first_sec_sid, self.min_size_std_stream,), file=logfile)
+            print("SSAT_first_sec_sid=%d, SSAT_tot_secs=%d" % (SSAT_first_sec_sid, SSAT_tot_secs,), file=logfile)
+            print("MSATX_first_sec_sid=%d, MSATX_tot_secs=%d" % (MSATX_first_sec_sid, MSATX_tot_secs,), file=logfile)
+        nent = sec_size // 4 # number of SID entries in a sector
+        fmt = "<%di" % nent
+        trunc_warned = 0
+        #
+        # === build the MSAT ===
+        #
+        MSAT = list(unpack('<109i', mem[76:512]))
+        SAT_sectors_reqd = (mem_data_secs + nent - 1) // nent
+        expected_MSATX_sectors = max(0, (SAT_sectors_reqd - 109 + nent - 2) // (nent - 1))
+        actual_MSATX_sectors = 0
+        if MSATX_tot_secs == 0 and MSATX_first_sec_sid in (EOCSID, FREESID, 0):
+            # Strictly, if there is no MSAT extension, then MSATX_first_sec_sid
+            # should be set to EOCSID ... FREESID and 0 have been met in the wild.
+            pass # Presuming no extension
+        else:
+            sid = MSATX_first_sec_sid
+            while sid not in (EOCSID, FREESID, MSATSID):
+                # Above should be only EOCSID according to MS & OOo docs
+                # but Excel doesn't complain about FREESID. Zero is a valid
+                # sector number, not a sentinel.
+                if DEBUG > 1:
+                    print('MSATX: sid=%d (0x%08X)' % (sid, sid), file=logfile)
+                if sid >= mem_data_secs:
+                    msg = "MSAT extension: accessing sector %d but only %d in file" % (sid, mem_data_secs)
+                    if DEBUG > 1:
+                        print(msg, file=logfile)
+                        break
+                    raise CompDocError(msg)
+                elif sid < 0:
+                    raise CompDocError("MSAT extension: invalid sector id: %d" % sid)
+                if seen[sid]:
+                    raise CompDocError("MSAT corruption: seen[%d] == %d" % (sid, seen[sid]))
+                seen[sid] = 1
+                actual_MSATX_sectors += 1
+                if DEBUG and actual_MSATX_sectors > expected_MSATX_sectors:
+                    print("[1]===>>>", mem_data_secs, nent, SAT_sectors_reqd, expected_MSATX_sectors, actual_MSATX_sectors, file=logfile)
+                offset = 512 + sec_size * sid
+                MSAT.extend(unpack(fmt, mem[offset:offset+sec_size]))
+                sid = MSAT.pop() # last sector id is sid of next sector in the chain
+
+        if DEBUG and actual_MSATX_sectors != expected_MSATX_sectors:
+            print("[2]===>>>", mem_data_secs, nent, SAT_sectors_reqd, expected_MSATX_sectors, actual_MSATX_sectors, file=logfile)
+        if DEBUG:
+            print("MSAT: len =", len(MSAT), file=logfile)
+            dump_list(MSAT, 10, logfile)
+        #
+        # === build the SAT ===
+        #
+        self.SAT = []
+        actual_SAT_sectors = 0
+        dump_again = 0
+        for msidx in xrange(len(MSAT)):
+            msid = MSAT[msidx]
+            if msid in (FREESID, EOCSID):
+                # Specification: the MSAT array may be padded with trailing FREESID entries.
+                # Toleration: a FREESID or EOCSID entry anywhere in the MSAT array will be ignored.
+                continue
+            if msid >= mem_data_secs:
+                if not trunc_warned:
+                    print("WARNING *** File is truncated, or OLE2 MSAT is corrupt!!", file=logfile)
+                    print("INFO: Trying to access sector %d but only %d available"
+                        % (msid, mem_data_secs), file=logfile)
+                    trunc_warned = 1
+                MSAT[msidx] = EVILSID
+                dump_again = 1
+                continue
+            elif msid < -2:
+                raise CompDocError("MSAT: invalid sector id: %d" % msid)
+            if seen[msid]:
+                raise CompDocError("MSAT extension corruption: seen[%d] == %d" % (msid, seen[msid]))
+            seen[msid] = 2
+            actual_SAT_sectors += 1
+            if DEBUG and actual_SAT_sectors > SAT_sectors_reqd:
+                print("[3]===>>>", mem_data_secs, nent, SAT_sectors_reqd, expected_MSATX_sectors, actual_MSATX_sectors, actual_SAT_sectors, msid, file=logfile)
+            offset = 512 + sec_size * msid
+            self.SAT.extend(unpack(fmt, mem[offset:offset+sec_size]))
+
+        if DEBUG:
+            print("SAT: len =", len(self.SAT), file=logfile)
+            dump_list(self.SAT, 10, logfile)
+            # print >> logfile, "SAT ",
+            # for i, s in enumerate(self.SAT):
+            #     print >> logfile, "entry: %4d offset: %6d, next entry: %4d" % (i, 512 + sec_size * i, s)
+            #     print >> logfile, "%d:%d " % (i, s),
+            print(file=logfile)
+        if DEBUG and dump_again:
+            print("MSAT: len =", len(MSAT), file=logfile)
+            dump_list(MSAT, 10, logfile)
+            for satx in xrange(mem_data_secs, len(self.SAT)):
+                self.SAT[satx] = EVILSID
+            print("SAT: len =", len(self.SAT), file=logfile)
+            dump_list(self.SAT, 10, logfile)
+        #
+        # === build the directory ===
+        #
+        dbytes = self._get_stream(
+            self.mem, 512, self.SAT, self.sec_size, self.dir_first_sec_sid,
+            name="directory", seen_id=3)
+        dirlist = []
+        did = -1
+        for pos in xrange(0, len(dbytes), 128):
+            did += 1
+            dirlist.append(DirNode(did, dbytes[pos:pos+128], 0, logfile))
+        self.dirlist = dirlist
+        _build_family_tree(dirlist, 0, dirlist[0].root_DID) # and stand well back ...
+        if DEBUG:
+            for d in dirlist:
+                d.dump(DEBUG)
+        #
+        # === get the SSCS ===
+        #
+        sscs_dir = self.dirlist[0]
+        assert sscs_dir.etype == 5 # root entry
+        if sscs_dir.first_SID < 0 or sscs_dir.tot_size == 0:
+            # Problem reported by Frank Hoffsuemmer: some software was
+            # writing -1 instead of -2 (EOCSID) for the first_SID
+            # when the SCCS was empty. Not having EOCSID caused assertion
+            # failure in _get_stream.
+            # Solution: avoid calling _get_stream in any case when the
+            # SCSS appears to be empty.
+            self.SSCS = ""
+        else:
+            self.SSCS = self._get_stream(
+                self.mem, 512, self.SAT, sec_size, sscs_dir.first_SID,
+                sscs_dir.tot_size, name="SSCS", seen_id=4)
+        # if DEBUG: print >> logfile, "SSCS", repr(self.SSCS)
+        #
+        # === build the SSAT ===
+        #
+        self.SSAT = []
+        if SSAT_tot_secs > 0 and sscs_dir.tot_size == 0:
+            print("WARNING *** OLE2 inconsistency: SSCS size is 0 but SSAT size is non-zero", file=logfile)
+        if sscs_dir.tot_size > 0:
+            sid = SSAT_first_sec_sid
+            nsecs = SSAT_tot_secs
+            while sid >= 0 and nsecs > 0:
+                if seen[sid]:
+                    raise CompDocError("SSAT corruption: seen[%d] == %d" % (sid, seen[sid]))
+                seen[sid] = 5
+                nsecs -= 1
+                start_pos = 512 + sid * sec_size
+                news = list(unpack(fmt, mem[start_pos:start_pos+sec_size]))
+                self.SSAT.extend(news)
+                sid = self.SAT[sid]
+            if DEBUG: print("SSAT last sid %d; remaining sectors %d" % (sid, nsecs), file=logfile)
+            assert nsecs == 0 and sid == EOCSID
+        if DEBUG:
+            print("SSAT", file=logfile)
+            dump_list(self.SSAT, 10, logfile)
+        if DEBUG:
+            print("seen", file=logfile)
+            dump_list(seen, 20, logfile)
+
+    def _get_stream(self, mem, base, sat, sec_size, start_sid, size=None, name='', seen_id=None):
+        # print >> self.logfile, "_get_stream", base, sec_size, start_sid, size
+        sectors = []
+        s = start_sid
+        if size is None:
+            # nothing to check against
+            while s >= 0:
+                if seen_id is not None:
+                    if self.seen[s]:
+                        raise CompDocError("%s corruption: seen[%d] == %d" % (name, s, self.seen[s]))
+                    self.seen[s] = seen_id
+                start_pos = base + s * sec_size
+                sectors.append(mem[start_pos:start_pos+sec_size])
+                try:
+                    s = sat[s]
+                except IndexError:
+                    raise CompDocError(
+                        "OLE2 stream %r: sector allocation table invalid entry (%d)" %
+                        (name, s)
+                    )
+            assert s == EOCSID
+        else:
+            todo = size
+            while s >= 0:
+                if seen_id is not None:
+                    if self.seen[s]:
+                        raise CompDocError("%s corruption: seen[%d] == %d" % (name, s, self.seen[s]))
+                    self.seen[s] = seen_id
+                start_pos = base + s * sec_size
+                grab = sec_size
+                if grab > todo:
+                    grab = todo
+                todo -= grab
+                sectors.append(mem[start_pos:start_pos+grab])
+                try:
+                    s = sat[s]
+                except IndexError:
+                    raise CompDocError(
+                        "OLE2 stream %r: sector allocation table invalid entry (%d)" %
+                        (name, s)
+                    )
+            assert s == EOCSID
+            if todo != 0:
+                fprintf(self.logfile,
+                    "WARNING *** OLE2 stream %r: expected size %d, actual size %d\n",
+                    name, size, size - todo)
+
+        return b''.join(sectors)
+
+    def _dir_search(self, path, storage_DID=0):
+        # Return matching DirNode instance, or None
+        head = path[0]
+        tail = path[1:]
+        dl = self.dirlist
+        for child in dl[storage_DID].children:
+            if dl[child].name.lower() == head.lower():
+                et = dl[child].etype
+                if et == 2:
+                    return dl[child]
+                if et == 1:
+                    if not tail:
+                        raise CompDocError("Requested component is a 'storage'")
+                    return self._dir_search(tail, child)
+                dl[child].dump(1)
+                raise CompDocError("Requested stream is not a 'user stream'")
+        return None
+
+
+    def get_named_stream(self, qname):
+        """
+        Interrogate the compound document's directory; return the stream as a
+        string if found, otherwise return ``None``.
+
+        :param qname:
+          Name of the desired stream e.g. ``'Workbook'``.
+          Should be in Unicode or convertible thereto.
+        """
+        d = self._dir_search(qname.split("/"))
+        if d is None:
+            return None
+        if d.tot_size >= self.min_size_std_stream:
+            return self._get_stream(
+                self.mem, 512, self.SAT, self.sec_size, d.first_SID,
+                d.tot_size, name=qname, seen_id=d.DID+6)
+        else:
+            return self._get_stream(
+                self.SSCS, 0, self.SSAT, self.short_sec_size, d.first_SID,
+                d.tot_size, name=qname + " (from SSCS)", seen_id=None)
+
+    def locate_named_stream(self, qname):
+        """
+        Interrogate the compound document's directory.
+
+        If the named stream is not found, ``(None, 0, 0)`` will be returned.
+
+        If the named stream is found and is contiguous within the original
+        byte sequence (``mem``) used when the document was opened,
+        then ``(mem, offset_to_start_of_stream, length_of_stream)`` is returned.
+
+        Otherwise a new string is built from the fragments and
+        ``(new_string, 0, length_of_stream)`` is returned.
+
+        :param qname:
+          Name of the desired stream e.g. ``'Workbook'``.
+          Should be in Unicode or convertible thereto.
+        """
+        d = self._dir_search(qname.split("/"))
+        if d is None:
+            return (None, 0, 0)
+        if d.tot_size > self.mem_data_len:
+            raise CompDocError("%r stream length (%d bytes) > file data size (%d bytes)"
+                % (qname, d.tot_size, self.mem_data_len))
+        if d.tot_size >= self.min_size_std_stream:
+            result = self._locate_stream(
+                self.mem, 512, self.SAT, self.sec_size, d.first_SID,
+                d.tot_size, qname, d.DID+6)
+            if self.DEBUG:
+                print("\nseen", file=self.logfile)
+                dump_list(self.seen, 20, self.logfile)
+            return result
+        else:
+            return (
+                self._get_stream(
+                    self.SSCS, 0, self.SSAT, self.short_sec_size, d.first_SID,
+                    d.tot_size, qname + " (from SSCS)", None),
+                0,
+                d.tot_size,
+            )
+
+    def _locate_stream(self, mem, base, sat, sec_size, start_sid, expected_stream_size, qname, seen_id):
+        # print >> self.logfile, "_locate_stream", base, sec_size, start_sid, expected_stream_size
+        s = start_sid
+        if s < 0:
+            raise CompDocError("_locate_stream: start_sid (%d) is -ve" % start_sid)
+        p = -99 # dummy previous SID
+        start_pos = -9999
+        end_pos = -8888
+        slices = []
+        tot_found = 0
+        found_limit = (expected_stream_size + sec_size - 1) // sec_size
+        while s >= 0:
+            if self.seen[s]:
+                if not self.ignore_workbook_corruption:
+                    print("_locate_stream(%s): seen" % qname, file=self.logfile); dump_list(self.seen, 20, self.logfile)
+                    raise CompDocError("%s corruption: seen[%d] == %d" % (qname, s, self.seen[s]))
+            self.seen[s] = seen_id
+            tot_found += 1
+            if tot_found > found_limit:
+                # Note: expected size rounded up to higher sector
+                raise CompDocError(
+                    "%s: size exceeds expected %d bytes; corrupt?"
+                    % (qname, found_limit * sec_size)
+                )
+            if s == p+1:
+                # contiguous sectors
+                end_pos += sec_size
+            else:
+                # start new slice
+                if p >= 0:
+                    # not first time
+                    slices.append((start_pos, end_pos))
+                start_pos = base + s * sec_size
+                end_pos = start_pos + sec_size
+            p = s
+            s = sat[s]
+        assert s == EOCSID
+        assert tot_found == found_limit
+        # print >> self.logfile, "_locate_stream(%s): seen" % qname; dump_list(self.seen, 20, self.logfile)
+        if not slices:
+            # The stream is contiguous ... just what we like!
+            return (mem, start_pos, expected_stream_size)
+        slices.append((start_pos, end_pos))
+        # print >> self.logfile, "+++>>> %d fragments" % len(slices)
+        return (b''.join(mem[start_pos:end_pos] for start_pos, end_pos in slices), 0, expected_stream_size)
+
+# ==========================================================================================
+def x_dump_line(alist, stride, f, dpos, equal=0):
+    print("%5d%s" % (dpos, " ="[equal]), end=' ', file=f)
+    for value in alist[dpos:dpos + stride]:
+        print(str(value), end=' ', file=f)
+    print(file=f)
+
+def dump_list(alist, stride, f=sys.stdout):
+    def _dump_line(dpos, equal=0):
+        print("%5d%s" % (dpos, " ="[equal]), end=' ', file=f)
+        for value in alist[dpos:dpos + stride]:
+            print(str(value), end=' ', file=f)
+        print(file=f)
+    pos = None
+    oldpos = None
+    for pos in xrange(0, len(alist), stride):
+        if oldpos is None:
+            _dump_line(pos)
+            oldpos = pos
+        elif alist[pos:pos+stride] != alist[oldpos:oldpos+stride]:
+            if pos - oldpos > stride:
+                _dump_line(pos - stride, equal=1)
+            _dump_line(pos)
+            oldpos = pos
+    if oldpos is not None and pos is not None and pos != oldpos:
+        _dump_line(pos, equal=1)
diff --git a/.venv/lib/python3.12/site-packages/xlrd/formatting.py b/.venv/lib/python3.12/site-packages/xlrd/formatting.py
new file mode 100644
index 00000000..ca637b81
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/formatting.py
@@ -0,0 +1,1324 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+# No part of the content of this file was derived from the works of
+# David Giffin.
+"""
+Module for formatting information.
+"""
+
+from __future__ import print_function
+
+import re
+from struct import unpack
+
+from .biffh import (
+    FDT, FGE, FNU, FTX, FUN, XL_CELL_DATE, XL_CELL_NUMBER, XL_CELL_TEXT,
+    XL_FORMAT, XL_FORMAT2, BaseObject, XLRDError, fprintf, unpack_string,
+    unpack_unicode, upkbits, upkbitsL,
+)
+from .timemachine import *
+
+DEBUG = 0
+
+_cellty_from_fmtty = {
+    FNU: XL_CELL_NUMBER,
+    FUN: XL_CELL_NUMBER,
+    FGE: XL_CELL_NUMBER,
+    FDT: XL_CELL_DATE,
+    FTX: XL_CELL_NUMBER, # Yes, a number can be formatted as text.
+}
+
+excel_default_palette_b5 = (
+    (  0,   0,   0), (255, 255, 255), (255,   0,   0), (  0, 255,   0),
+    (  0,   0, 255), (255, 255,   0), (255,   0, 255), (  0, 255, 255),
+    (128,   0,   0), (  0, 128,   0), (  0,   0, 128), (128, 128,   0),
+    (128,   0, 128), (  0, 128, 128), (192, 192, 192), (128, 128, 128),
+    (153, 153, 255), (153,  51, 102), (255, 255, 204), (204, 255, 255),
+    (102,   0, 102), (255, 128, 128), (  0, 102, 204), (204, 204, 255),
+    (  0,   0, 128), (255,   0, 255), (255, 255,   0), (  0, 255, 255),
+    (128,   0, 128), (128,   0,   0), (  0, 128, 128), (  0,   0, 255),
+    (  0, 204, 255), (204, 255, 255), (204, 255, 204), (255, 255, 153),
+    (153, 204, 255), (255, 153, 204), (204, 153, 255), (227, 227, 227),
+    ( 51, 102, 255), ( 51, 204, 204), (153, 204,   0), (255, 204,   0),
+    (255, 153,   0), (255, 102,   0), (102, 102, 153), (150, 150, 150),
+    (  0,  51, 102), ( 51, 153, 102), (  0,  51,   0), ( 51,  51,   0),
+    (153,  51,   0), (153,  51, 102), ( 51,  51, 153), ( 51,  51,  51),
+)
+
+excel_default_palette_b2 = excel_default_palette_b5[:16]
+
+# Following table borrowed from Gnumeric 1.4 source.
+# Checked against OOo docs and MS docs.
+excel_default_palette_b8 = ( # (red, green, blue)
+    (  0,  0,  0), (255,255,255), (255,  0,  0), (  0,255,  0), # 0
+    (  0,  0,255), (255,255,  0), (255,  0,255), (  0,255,255), # 4
+    (128,  0,  0), (  0,128,  0), (  0,  0,128), (128,128,  0), # 8
+    (128,  0,128), (  0,128,128), (192,192,192), (128,128,128), # 12
+    (153,153,255), (153, 51,102), (255,255,204), (204,255,255), # 16
+    (102,  0,102), (255,128,128), (  0,102,204), (204,204,255), # 20
+    (  0,  0,128), (255,  0,255), (255,255,  0), (  0,255,255), # 24
+    (128,  0,128), (128,  0,  0), (  0,128,128), (  0,  0,255), # 28
+    (  0,204,255), (204,255,255), (204,255,204), (255,255,153), # 32
+    (153,204,255), (255,153,204), (204,153,255), (255,204,153), # 36
+    ( 51,102,255), ( 51,204,204), (153,204,  0), (255,204,  0), # 40
+    (255,153,  0), (255,102,  0), (102,102,153), (150,150,150), # 44
+    (  0, 51,102), ( 51,153,102), (  0, 51,  0), ( 51, 51,  0), # 48
+    (153, 51,  0), (153, 51,102), ( 51, 51,153), ( 51, 51, 51), # 52
+)
+
+default_palette = {
+    80: excel_default_palette_b8,
+    70: excel_default_palette_b5,
+    50: excel_default_palette_b5,
+    45: excel_default_palette_b2,
+    40: excel_default_palette_b2,
+    30: excel_default_palette_b2,
+    21: excel_default_palette_b2,
+    20: excel_default_palette_b2,
+}
+
+# 00H = Normal
+# 01H = RowLevel_lv (see next field)
+# 02H = ColLevel_lv (see next field)
+# 03H = Comma
+# 04H = Currency
+# 05H = Percent
+# 06H = Comma [0] (BIFF4-BIFF8)
+# 07H = Currency [0] (BIFF4-BIFF8)
+# 08H = Hyperlink (BIFF8)
+# 09H = Followed Hyperlink (BIFF8)
+built_in_style_names = [
+    "Normal",
+    "RowLevel_",
+    "ColLevel_",
+    "Comma",
+    "Currency",
+    "Percent",
+    "Comma [0]",
+    "Currency [0]",
+    "Hyperlink",
+    "Followed Hyperlink",
+]
+
+def initialise_colour_map(book):
+    book.colour_map = {}
+    book.colour_indexes_used = {}
+    if not book.formatting_info:
+        return
+    # Add the 8 invariant colours
+    for i in xrange(8):
+        book.colour_map[i] = excel_default_palette_b8[i]
+    # Add the default palette depending on the version
+    dpal = default_palette[book.biff_version]
+    ndpal = len(dpal)
+    for i in xrange(ndpal):
+        book.colour_map[i+8] = dpal[i]
+    # Add the specials -- None means the RGB value is not known
+    # System window text colour for border lines
+    book.colour_map[ndpal+8] = None
+    # System window background colour for pattern background
+    book.colour_map[ndpal+8+1] = None
+    # System ToolTip text colour (used in note objects)
+    book.colour_map[0x51] = None
+    # 32767, system window text colour for fonts
+    book.colour_map[0x7FFF] = None
+
+
+def nearest_colour_index(colour_map, rgb, debug=0):
+    """
+    General purpose function. Uses Euclidean distance.
+    So far used only for pre-BIFF8 ``WINDOW2`` record.
+    Doesn't have to be fast.
+    Doesn't have to be fancy.
+    """
+    best_metric = 3 * 256 * 256
+    best_colourx = 0
+    for colourx, cand_rgb in colour_map.items():
+        if cand_rgb is None:
+            continue
+        metric = 0
+        for v1, v2 in zip(rgb, cand_rgb):
+            metric += (v1 - v2) * (v1 - v2)
+        if metric < best_metric:
+            best_metric = metric
+            best_colourx = colourx
+            if metric == 0:
+                break
+    if 0 and debug:
+        print("nearest_colour_index for %r is %r -> %r; best_metric is %d"
+            % (rgb, best_colourx, colour_map[best_colourx], best_metric))
+    return best_colourx
+
+class EqNeAttrs(object):
+    """
+    This mixin class exists solely so that :class:`Format`, :class:`Font`, and
+    :class:`XF` objects can be compared by value of their attributes.
+    """
+
+    def __eq__(self, other):
+        return self.__dict__ == other.__dict__
+
+    def __ne__(self, other):
+        return self.__dict__ != other.__dict__
+
+class Font(BaseObject, EqNeAttrs):
+    """
+    An Excel "font" contains the details of not only what is normally
+    considered a font, but also several other display attributes.
+    Items correspond to those in the Excel UI's Format -> Cells -> Font tab.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: 1 = Characters are bold. Redundant; see "weight" attribute.
+    bold = 0
+
+    #: Values:
+    #: ::
+    #:
+    #:   0 = ANSI Latin
+    #:   1 = System default
+    #:   2 = Symbol,
+    #:   77 = Apple Roman,
+    #:   128 = ANSI Japanese Shift-JIS,
+    #:   129 = ANSI Korean (Hangul),
+    #:   130 = ANSI Korean (Johab),
+    #:   134 = ANSI Chinese Simplified GBK,
+    #:   136 = ANSI Chinese Traditional BIG5,
+    #:   161 = ANSI Greek,
+    #:   162 = ANSI Turkish,
+    #:   163 = ANSI Vietnamese,
+    #:   177 = ANSI Hebrew,
+    #:   178 = ANSI Arabic,
+    #:   186 = ANSI Baltic,
+    #:   204 = ANSI Cyrillic,
+    #:   222 = ANSI Thai,
+    #:   238 = ANSI Latin II (Central European),
+    #:   255 = OEM Latin I
+    character_set = 0
+
+    #: An explanation of "colour index" is given in :ref:`palette`.
+    colour_index = 0
+
+    #: 1 = Superscript, 2 = Subscript.
+    escapement = 0
+
+    #: Values:
+    #: ::
+    #:
+    #:   0 = None (unknown or don't care)
+    #:   1 = Roman (variable width, serifed)
+    #:   2 = Swiss (variable width, sans-serifed)
+    #:   3 = Modern (fixed width, serifed or sans-serifed)
+    #:   4 = Script (cursive)
+    #:   5 = Decorative (specialised, for example Old English, Fraktur)
+    family = 0
+
+    #: The 0-based index used to refer to this Font() instance.
+    #: Note that index 4 is never used; xlrd supplies a dummy place-holder.
+    font_index = 0
+
+    #: Height of the font (in twips). A twip = 1/20 of a point.
+    height = 0
+
+    #: 1 = Characters are italic.
+    italic = 0
+
+    #: The name of the font. Example: ``"Arial"``.
+    name = UNICODE_LITERAL("")
+
+    #: 1 = Characters are struck out.
+    struck_out = 0
+
+    #: Values:
+    #: ::
+    #:
+    #:   0 = None
+    #:   1 = Single;  0x21 (33) = Single accounting
+    #:   2 = Double;  0x22 (34) = Double accounting
+    underline_type = 0
+
+    #: 1 = Characters are underlined. Redundant; see
+    #: :attr:`underline_type` attribute.
+    underlined = 0
+
+    #: Font weight (100-1000). Standard values are 400 for normal text
+    #: and 700 for bold text.
+    weight = 400
+
+    #: 1 = Font is outline style (Macintosh only)
+    outline = 0
+
+    #: 1 = Font is shadow style (Macintosh only)
+    shadow = 0
+
+def handle_efont(book, data): # BIFF2 only
+    if not book.formatting_info:
+        return
+    book.font_list[-1].colour_index = unpack('<H', data)[0]
+
+def handle_font(book, data):
+    if not book.formatting_info:
+        return
+    if not book.encoding:
+        book.derive_encoding()
+    blah = DEBUG or book.verbosity >= 2
+    bv = book.biff_version
+    k = len(book.font_list)
+    if k == 4:
+        f = Font()
+        f.name = UNICODE_LITERAL('Dummy Font')
+        f.font_index = k
+        book.font_list.append(f)
+        k += 1
+    f = Font()
+    f.font_index = k
+    book.font_list.append(f)
+    if bv >= 50:
+        (
+            f.height, option_flags, f.colour_index, f.weight,
+            f.escapement, f.underline_type, f.family,
+            f.character_set,
+        ) = unpack('<HHHHHBBB', data[0:13])
+        f.bold = option_flags & 1
+        f.italic = (option_flags & 2) >> 1
+        f.underlined = (option_flags & 4) >> 2
+        f.struck_out = (option_flags & 8) >> 3
+        f.outline = (option_flags & 16) >> 4
+        f.shadow = (option_flags & 32) >> 5
+        if bv >= 80:
+            f.name = unpack_unicode(data, 14, lenlen=1)
+        else:
+            f.name = unpack_string(data, 14, book.encoding, lenlen=1)
+    elif bv >= 30:
+        f.height, option_flags, f.colour_index = unpack('<HHH', data[0:6])
+        f.bold = option_flags & 1
+        f.italic = (option_flags & 2) >> 1
+        f.underlined = (option_flags & 4) >> 2
+        f.struck_out = (option_flags & 8) >> 3
+        f.outline = (option_flags & 16) >> 4
+        f.shadow = (option_flags & 32) >> 5
+        f.name = unpack_string(data, 6, book.encoding, lenlen=1)
+        # Now cook up the remaining attributes ...
+        f.weight = [400, 700][f.bold]
+        f.escapement = 0 # None
+        f.underline_type = f.underlined # None or Single
+        f.family = 0 # Unknown / don't care
+        f.character_set = 1 # System default (0 means "ANSI Latin")
+    else: # BIFF2
+        f.height, option_flags = unpack('<HH', data[0:4])
+        f.colour_index = 0x7FFF # "system window text colour"
+        f.bold = option_flags & 1
+        f.italic = (option_flags & 2) >> 1
+        f.underlined = (option_flags & 4) >> 2
+        f.struck_out = (option_flags & 8) >> 3
+        f.outline = 0
+        f.shadow = 0
+        f.name = unpack_string(data, 4, book.encoding, lenlen=1)
+        # Now cook up the remaining attributes ...
+        f.weight = [400, 700][f.bold]
+        f.escapement = 0 # None
+        f.underline_type = f.underlined # None or Single
+        f.family = 0 # Unknown / don't care
+        f.character_set = 1 # System default (0 means "ANSI Latin")
+    if blah:
+        f.dump(
+            book.logfile,
+            header="--- handle_font: font[%d] ---" % f.font_index,
+            footer="-------------------",
+        )
+
+# === "Number formats" ===
+
+class Format(BaseObject, EqNeAttrs):
+    """
+    "Number format" information from a ``FORMAT`` record.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: The key into :attr:`~xlrd.book.Book.format_map`
+    format_key = 0
+
+    #: A classification that has been inferred from the format string.
+    #: Currently, this is used only to distinguish between numbers and dates.
+    #: Values::
+    #:
+    #:   FUN = 0 # unknown
+    #:   FDT = 1 # date
+    #:   FNU = 2 # number
+    #:   FGE = 3 # general
+    #:   FTX = 4 # text
+    type = FUN
+
+    #: The format string
+    format_str = UNICODE_LITERAL('')
+
+    def __init__(self, format_key, ty, format_str):
+        self.format_key = format_key
+        self.type = ty
+        self.format_str = format_str
+
+std_format_strings = {
+    # "std" == "standard for US English locale"
+    # #### TODO ... a lot of work to tailor these to the user's locale.
+    # See e.g. gnumeric-1.x.y/src/formats.c
+    0x00: "General",
+    0x01: "0",
+    0x02: "0.00",
+    0x03: "#,##0",
+    0x04: "#,##0.00",
+    0x05: "$#,##0_);($#,##0)",
+    0x06: "$#,##0_);[Red]($#,##0)",
+    0x07: "$#,##0.00_);($#,##0.00)",
+    0x08: "$#,##0.00_);[Red]($#,##0.00)",
+    0x09: "0%",
+    0x0a: "0.00%",
+    0x0b: "0.00E+00",
+    0x0c: "# ?/?",
+    0x0d: "# ??/??",
+    0x0e: "m/d/yy",
+    0x0f: "d-mmm-yy",
+    0x10: "d-mmm",
+    0x11: "mmm-yy",
+    0x12: "h:mm AM/PM",
+    0x13: "h:mm:ss AM/PM",
+    0x14: "h:mm",
+    0x15: "h:mm:ss",
+    0x16: "m/d/yy h:mm",
+    0x25: "#,##0_);(#,##0)",
+    0x26: "#,##0_);[Red](#,##0)",
+    0x27: "#,##0.00_);(#,##0.00)",
+    0x28: "#,##0.00_);[Red](#,##0.00)",
+    0x29: "_(* #,##0_);_(* (#,##0);_(* \"-\"_);_(@_)",
+    0x2a: "_($* #,##0_);_($* (#,##0);_($* \"-\"_);_(@_)",
+    0x2b: "_(* #,##0.00_);_(* (#,##0.00);_(* \"-\"??_);_(@_)",
+    0x2c: "_($* #,##0.00_);_($* (#,##0.00);_($* \"-\"??_);_(@_)",
+    0x2d: "mm:ss",
+    0x2e: "[h]:mm:ss",
+    0x2f: "mm:ss.0",
+    0x30: "##0.0E+0",
+    0x31: "@",
+}
+
+fmt_code_ranges = [ # both-inclusive ranges of "standard" format codes
+    # Source: the openoffice.org doc't
+    # and the OOXML spec Part 4, section 3.8.30
+    ( 0,  0, FGE),
+    ( 1, 13, FNU),
+    (14, 22, FDT),
+    (27, 36, FDT), # CJK date formats
+    (37, 44, FNU),
+    (45, 47, FDT),
+    (48, 48, FNU),
+    (49, 49, FTX),
+    # Gnumeric assumes (or assumed) that built-in formats finish at 49, not at 163
+    (50, 58, FDT), # CJK date formats
+    (59, 62, FNU), # Thai number (currency?) formats
+    (67, 70, FNU), # Thai number (currency?) formats
+    (71, 81, FDT), # Thai date formats
+]
+
+std_format_code_types = {}
+for lo, hi, ty in fmt_code_ranges:
+    for x in xrange(lo, hi+1):
+        std_format_code_types[x] = ty
+del lo, hi, ty, x
+
+date_chars = UNICODE_LITERAL('ymdhs') # year, month/minute, day, hour, second
+date_char_dict = {}
+for _c in date_chars + date_chars.upper():
+    date_char_dict[_c] = 5
+del _c, date_chars
+
+skip_char_dict = {}
+for _c in UNICODE_LITERAL('$-+/(): '):
+    skip_char_dict[_c] = 1
+
+num_char_dict = {
+    UNICODE_LITERAL('0'): 5,
+    UNICODE_LITERAL('#'): 5,
+    UNICODE_LITERAL('?'): 5,
+}
+
+non_date_formats = {
+    UNICODE_LITERAL('0.00E+00'):1,
+    UNICODE_LITERAL('##0.0E+0'):1,
+    UNICODE_LITERAL('General') :1,
+    UNICODE_LITERAL('GENERAL') :1, # OOo Calc 1.1.4 does this.
+    UNICODE_LITERAL('general') :1,  # pyExcelerator 0.6.3 does this.
+    UNICODE_LITERAL('@')       :1,
+}
+
+fmt_bracketed_sub = re.compile(r'\[[^]]*\]').sub
+
+# Boolean format strings (actual cases)
+# '"Yes";"Yes";"No"'
+# '"True";"True";"False"'
+# '"On";"On";"Off"'
+
+def is_date_format_string(book, fmt):
+    # Heuristics:
+    # Ignore "text" and [stuff in square brackets (aarrgghh -- see below)].
+    # Handle backslashed-escaped chars properly.
+    # E.g. hh\hmm\mss\s should produce a display like 23h59m59s
+    # Date formats have one or more of ymdhs (caseless) in them.
+    # Numeric formats have # and 0.
+    # N.B. 'General"."' hence get rid of "text" first.
+    # TODO: Find where formats are interpreted in Gnumeric
+    # TODO: '[h]\\ \\h\\o\\u\\r\\s' ([h] means don't care about hours > 23)
+    state = 0
+    s = ''
+
+    for c in fmt:
+        if state == 0:
+            if c == UNICODE_LITERAL('"'):
+                state = 1
+            elif c in UNICODE_LITERAL(r"\_*"):
+                state = 2
+            elif c in skip_char_dict:
+                pass
+            else:
+                s += c
+        elif state == 1:
+            if c == UNICODE_LITERAL('"'):
+                state = 0
+        elif state == 2:
+            # Ignore char after backslash, underscore or asterisk
+            state = 0
+        assert 0 <= state <= 2
+    if book.verbosity >= 4:
+        print("is_date_format_string: reduced format is %s" % REPR(s), file=book.logfile)
+    s = fmt_bracketed_sub('', s)
+    if s in non_date_formats:
+        return False
+    state = 0
+    separator = ";"
+    got_sep = 0
+    date_count = num_count = 0
+    for c in s:
+        if c in date_char_dict:
+            date_count += date_char_dict[c]
+        elif c in num_char_dict:
+            num_count += num_char_dict[c]
+        elif c == separator:
+            got_sep = 1
+    # print num_count, date_count, repr(fmt)
+    if date_count and not num_count:
+        return True
+    if num_count and not date_count:
+        return False
+    if date_count:
+        if book.verbosity:
+            fprintf(book.logfile,
+                'WARNING *** is_date_format: ambiguous d=%d n=%d fmt=%r\n',
+                date_count, num_count, fmt)
+    elif not got_sep:
+        if book.verbosity:
+            fprintf(book.logfile,
+                "WARNING *** format %r produces constant result\n",
+                fmt)
+    return date_count > num_count
+
+def handle_format(self, data, rectype=XL_FORMAT):
+    DEBUG = 0
+    bv = self.biff_version
+    if rectype == XL_FORMAT2:
+        bv = min(bv, 30)
+    if not self.encoding:
+        self.derive_encoding()
+    strpos = 2
+    if bv >= 50:
+        fmtkey = unpack('<H', data[0:2])[0]
+    else:
+        fmtkey = self.actualfmtcount
+        if bv <= 30:
+            strpos = 0
+    self.actualfmtcount += 1
+    if bv >= 80:
+        unistrg = unpack_unicode(data, 2)
+    else:
+        unistrg = unpack_string(data, strpos, self.encoding, lenlen=1)
+    blah = DEBUG or self.verbosity >= 3
+    if blah:
+        fprintf(self.logfile,
+            "FORMAT: count=%d fmtkey=0x%04x (%d) s=%r\n",
+            self.actualfmtcount, fmtkey, fmtkey, unistrg)
+    is_date_s = self.is_date_format_string(unistrg)
+    ty = [FGE, FDT][is_date_s]
+    if not(fmtkey > 163 or bv < 50):
+        # user_defined if fmtkey > 163
+        # N.B. Gnumeric incorrectly starts these at 50 instead of 164 :-(
+        # if earlier than BIFF 5, standard info is useless
+        std_ty = std_format_code_types.get(fmtkey, FUN)
+        # print "std ty", std_ty
+        is_date_c = std_ty == FDT
+        if self.verbosity and 0 < fmtkey < 50 and (is_date_c ^ is_date_s):
+            DEBUG = 2
+            fprintf(self.logfile,
+                "WARNING *** Conflict between "
+                "std format key %d and its format string %r\n",
+                fmtkey, unistrg)
+    if DEBUG == 2:
+        fprintf(self.logfile,
+            "ty: %d; is_date_c: %r; is_date_s: %r; fmt_strg: %r",
+            ty, is_date_c, is_date_s, unistrg)
+    fmtobj = Format(fmtkey, ty, unistrg)
+    if blah:
+        fmtobj.dump(self.logfile,
+            header="--- handle_format [%d] ---" % (self.actualfmtcount-1, ))
+    self.format_map[fmtkey] = fmtobj
+    self.format_list.append(fmtobj)
+
+# =============================================================================
+
+def handle_palette(book, data):
+    if not book.formatting_info:
+        return
+    blah = DEBUG or book.verbosity >= 2
+    n_colours, = unpack('<H', data[:2])
+    expected_n_colours = (16, 56)[book.biff_version >= 50]
+    if (DEBUG or book.verbosity >= 1) and n_colours != expected_n_colours:
+        fprintf(book.logfile,
+            "NOTE *** Expected %d colours in PALETTE record, found %d\n",
+            expected_n_colours, n_colours)
+    elif blah:
+        fprintf(book.logfile,
+            "PALETTE record with %d colours\n", n_colours)
+    fmt = '<xx%di' % n_colours # use i to avoid long integers
+    expected_size = 4 * n_colours + 2
+    actual_size = len(data)
+    tolerance = 4
+    if not expected_size <= actual_size <= expected_size + tolerance:
+        raise XLRDError('PALETTE record: expected size %d, actual size %d' % (expected_size, actual_size))
+    colours = unpack(fmt, data[:expected_size])
+    assert book.palette_record == [] # There should be only 1 PALETTE record
+    # a colour will be 0xbbggrr
+    # IOW, red is at the little end
+    for i in xrange(n_colours):
+        c = colours[i]
+        red   =  c        & 0xff
+        green = (c >>  8) & 0xff
+        blue  = (c >> 16) & 0xff
+        old_rgb = book.colour_map[8+i]
+        new_rgb = (red, green, blue)
+        book.palette_record.append(new_rgb)
+        book.colour_map[8+i] = new_rgb
+        if blah:
+            if new_rgb != old_rgb:
+                print("%2d: %r -> %r" % (i, old_rgb, new_rgb), file=book.logfile)
+
+def palette_epilogue(book):
+    # Check colour indexes in fonts etc.
+    # This must be done here as FONT records
+    # come *before* the PALETTE record :-(
+    for font in book.font_list:
+        if font.font_index == 4: # the missing font record
+            continue
+        cx = font.colour_index
+        if cx == 0x7fff: # system window text colour
+            continue
+        if cx in book.colour_map:
+            book.colour_indexes_used[cx] = 1
+        elif book.verbosity:
+            print("Size of colour table:", len(book.colour_map), file=book.logfile)
+            fprintf(book.logfile, "*** Font #%d (%r): colour index 0x%04x is unknown\n",
+                font.font_index, font.name, cx)
+    if book.verbosity >= 1:
+        used = sorted(book.colour_indexes_used.keys())
+        print("\nColour indexes used:\n%r\n" % used, file=book.logfile)
+
+def handle_style(book, data):
+    if not book.formatting_info:
+        return
+    blah = DEBUG or book.verbosity >= 2
+    bv = book.biff_version
+    flag_and_xfx, built_in_id, level = unpack('<HBB', data[:4])
+    xf_index = flag_and_xfx & 0x0fff
+    if data == b"\0\0\0\0" and "Normal" not in book.style_name_map:
+        # Erroneous record (doesn't have built-in bit set).
+        # Example file supplied by Jeff Bell.
+        built_in = 1
+        built_in_id = 0
+        xf_index = 0
+        name = "Normal"
+        level = 255
+    elif flag_and_xfx & 0x8000:
+        # built-in style
+        built_in = 1
+        name = built_in_style_names[built_in_id]
+        if 1 <= built_in_id <= 2:
+            name += str(level + 1)
+    else:
+        # user-defined style
+        built_in = 0
+        built_in_id = 0
+        level = 0
+        if bv >= 80:
+            try:
+                name = unpack_unicode(data, 2, lenlen=2)
+            except UnicodeDecodeError:
+                print("STYLE: built_in=%d xf_index=%d built_in_id=%d level=%d"
+                    % (built_in, xf_index, built_in_id, level), file=book.logfile)
+                print("raw bytes:", repr(data[2:]), file=book.logfile)
+                raise
+        else:
+            name = unpack_string(data, 2, book.encoding, lenlen=1)
+        if blah and not name:
+            print("WARNING *** A user-defined style has a zero-length name", file=book.logfile)
+    book.style_name_map[name] = (built_in, xf_index)
+    if blah:
+        fprintf(book.logfile, "STYLE: built_in=%d xf_index=%d built_in_id=%d level=%d name=%r\n",
+            built_in, xf_index, built_in_id, level, name)
+
+def check_colour_indexes_in_obj(book, obj, orig_index):
+    alist = sorted(obj.__dict__.items())
+    for attr, nobj in alist:
+        if hasattr(nobj, 'dump'):
+            check_colour_indexes_in_obj(book, nobj, orig_index)
+        elif attr.find('colour_index') >= 0:
+            if nobj in book.colour_map:
+                book.colour_indexes_used[nobj] = 1
+                continue
+            oname = obj.__class__.__name__
+            print("*** xf #%d : %s.%s =  0x%04x (unknown)"
+                % (orig_index, oname, attr, nobj), file=book.logfile)
+
+def fill_in_standard_formats(book):
+    for x in std_format_code_types.keys():
+        if x not in book.format_map:
+            ty = std_format_code_types[x]
+            # Note: many standard format codes (mostly CJK date formats) have
+            # format strings that vary by locale; xlrd does not (yet)
+            # handle those; the type (date or numeric) is recorded but the fmt_str will be None.
+            fmt_str = std_format_strings.get(x)
+            fmtobj = Format(x, ty, fmt_str)
+            book.format_map[x] = fmtobj
+
+def handle_xf(self, data):
+    # self is a Book instance
+    # DEBUG = 0
+    blah = DEBUG or self.verbosity >= 3
+    bv = self.biff_version
+    xf = XF()
+    xf.alignment = XFAlignment()
+    xf.alignment.indent_level = 0
+    xf.alignment.shrink_to_fit = 0
+    xf.alignment.text_direction = 0
+    xf.border = XFBorder()
+    xf.border.diag_up = 0
+    xf.border.diag_down = 0
+    xf.border.diag_colour_index = 0
+    xf.border.diag_line_style = 0 # no line
+    xf.background = XFBackground()
+    xf.protection = XFProtection()
+    # fill in the known standard formats
+    if bv >= 50 and not self.xfcount:
+        # i.e. do this once before we process the first XF record
+        fill_in_standard_formats(self)
+    if bv >= 80:
+        unpack_fmt = '<HHHBBBBIiH'
+        (
+            xf.font_index, xf.format_key, pkd_type_par,
+            pkd_align1, xf.alignment.rotation, pkd_align2,
+            pkd_used, pkd_brdbkg1, pkd_brdbkg2, pkd_brdbkg3,
+        ) = unpack(unpack_fmt, data[0:20])
+        upkbits(xf.protection, pkd_type_par, (
+            (0, 0x01, 'cell_locked'),
+            (1, 0x02, 'formula_hidden'),
+        ))
+        upkbits(xf, pkd_type_par, (
+            (2, 0x0004, 'is_style'),
+            # Following is not in OOo docs, but is mentioned
+            # in Gnumeric source and also in (deep breath)
+            # org.apache.poi.hssf.record.ExtendedFormatRecord.java
+            (3, 0x0008, 'lotus_123_prefix'), # Meaning is not known.
+            (4, 0xFFF0, 'parent_style_index'),
+        ))
+        upkbits(xf.alignment, pkd_align1, (
+            (0, 0x07, 'hor_align'),
+            (3, 0x08, 'text_wrapped'),
+            (4, 0x70, 'vert_align'),
+        ))
+        upkbits(xf.alignment, pkd_align2, (
+            (0, 0x0f, 'indent_level'),
+            (4, 0x10, 'shrink_to_fit'),
+            (6, 0xC0, 'text_direction'),
+        ))
+        reg = pkd_used >> 2
+        attr_stems = [
+            'format',
+            'font',
+            'alignment',
+            'border',
+            'background',
+            'protection',
+        ]
+        for attr_stem in attr_stems:
+            attr = "_" + attr_stem + "_flag"
+            setattr(xf, attr, reg & 1)
+            reg >>= 1
+        upkbitsL(xf.border, pkd_brdbkg1, (
+            (0,  0x0000000f,  'left_line_style'),
+            (4,  0x000000f0,  'right_line_style'),
+            (8,  0x00000f00,  'top_line_style'),
+            (12, 0x0000f000,  'bottom_line_style'),
+            (16, 0x007f0000,  'left_colour_index'),
+            (23, 0x3f800000,  'right_colour_index'),
+            (30, 0x40000000,  'diag_down'),
+            (31, 0x80000000, 'diag_up'),
+        ))
+        upkbits(xf.border, pkd_brdbkg2, (
+            (0,  0x0000007F, 'top_colour_index'),
+            (7,  0x00003F80, 'bottom_colour_index'),
+            (14, 0x001FC000, 'diag_colour_index'),
+            (21, 0x01E00000, 'diag_line_style'),
+        ))
+        upkbitsL(xf.background, pkd_brdbkg2, (
+            (26, 0xFC000000, 'fill_pattern'),
+        ))
+        upkbits(xf.background, pkd_brdbkg3, (
+            (0, 0x007F, 'pattern_colour_index'),
+            (7, 0x3F80, 'background_colour_index'),
+        ))
+    elif bv >= 50:
+        unpack_fmt = '<HHHBBIi'
+        (
+            xf.font_index, xf.format_key, pkd_type_par,
+            pkd_align1, pkd_orient_used,
+            pkd_brdbkg1, pkd_brdbkg2,
+        ) = unpack(unpack_fmt, data[0:16])
+        upkbits(xf.protection, pkd_type_par, (
+            (0, 0x01, 'cell_locked'),
+            (1, 0x02, 'formula_hidden'),
+        ))
+        upkbits(xf, pkd_type_par, (
+            (2, 0x0004, 'is_style'),
+            (3, 0x0008, 'lotus_123_prefix'), # Meaning is not known.
+            (4, 0xFFF0, 'parent_style_index'),
+        ))
+        upkbits(xf.alignment, pkd_align1, (
+            (0, 0x07, 'hor_align'),
+            (3, 0x08, 'text_wrapped'),
+            (4, 0x70, 'vert_align'),
+        ))
+        orientation = pkd_orient_used & 0x03
+        xf.alignment.rotation = [0, 255, 90, 180][orientation]
+        reg = pkd_orient_used >> 2
+        attr_stems = [
+            'format',
+            'font',
+            'alignment',
+            'border',
+            'background',
+            'protection',
+        ]
+        for attr_stem in attr_stems:
+            attr = "_" + attr_stem + "_flag"
+            setattr(xf, attr, reg & 1)
+            reg >>= 1
+        upkbitsL(xf.background, pkd_brdbkg1, (
+            ( 0, 0x0000007F, 'pattern_colour_index'),
+            ( 7, 0x00003F80, 'background_colour_index'),
+            (16, 0x003F0000, 'fill_pattern'),
+        ))
+        upkbitsL(xf.border, pkd_brdbkg1, (
+            (22, 0x01C00000,  'bottom_line_style'),
+            (25, 0xFE000000, 'bottom_colour_index'),
+        ))
+        upkbits(xf.border, pkd_brdbkg2, (
+            ( 0, 0x00000007, 'top_line_style'),
+            ( 3, 0x00000038, 'left_line_style'),
+            ( 6, 0x000001C0, 'right_line_style'),
+            ( 9, 0x0000FE00, 'top_colour_index'),
+            (16, 0x007F0000, 'left_colour_index'),
+            (23, 0x3F800000, 'right_colour_index'),
+        ))
+    elif bv >= 40:
+        unpack_fmt = '<BBHBBHI'
+        (
+            xf.font_index, xf.format_key, pkd_type_par,
+            pkd_align_orient, pkd_used,
+            pkd_bkg_34, pkd_brd_34,
+        ) = unpack(unpack_fmt, data[0:12])
+        upkbits(xf.protection, pkd_type_par, (
+            (0, 0x01, 'cell_locked'),
+            (1, 0x02, 'formula_hidden'),
+        ))
+        upkbits(xf, pkd_type_par, (
+            (2, 0x0004, 'is_style'),
+            (3, 0x0008, 'lotus_123_prefix'), # Meaning is not known.
+            (4, 0xFFF0, 'parent_style_index'),
+        ))
+        upkbits(xf.alignment, pkd_align_orient, (
+            (0, 0x07, 'hor_align'),
+            (3, 0x08, 'text_wrapped'),
+            (4, 0x30, 'vert_align'),
+        ))
+        orientation = (pkd_align_orient & 0xC0) >> 6
+        xf.alignment.rotation = [0, 255, 90, 180][orientation]
+        reg = pkd_used >> 2
+        attr_stems = [
+            'format',
+            'font',
+            'alignment',
+            'border',
+            'background',
+            'protection',
+        ]
+        for attr_stem in attr_stems:
+            attr = "_" + attr_stem + "_flag"
+            setattr(xf, attr, reg & 1)
+            reg >>= 1
+        upkbits(xf.background, pkd_bkg_34, (
+            ( 0, 0x003F, 'fill_pattern'),
+            ( 6, 0x07C0, 'pattern_colour_index'),
+            (11, 0xF800, 'background_colour_index'),
+        ))
+        upkbitsL(xf.border, pkd_brd_34, (
+            ( 0, 0x00000007,  'top_line_style'),
+            ( 3, 0x000000F8,  'top_colour_index'),
+            ( 8, 0x00000700,  'left_line_style'),
+            (11, 0x0000F800,  'left_colour_index'),
+            (16, 0x00070000,  'bottom_line_style'),
+            (19, 0x00F80000,  'bottom_colour_index'),
+            (24, 0x07000000,  'right_line_style'),
+            (27, 0xF8000000, 'right_colour_index'),
+        ))
+    elif bv == 30:
+        unpack_fmt = '<BBBBHHI'
+        (
+            xf.font_index, xf.format_key, pkd_type_prot,
+            pkd_used, pkd_align_par,
+            pkd_bkg_34, pkd_brd_34,
+        ) = unpack(unpack_fmt, data[0:12])
+        upkbits(xf.protection, pkd_type_prot, (
+            (0, 0x01, 'cell_locked'),
+            (1, 0x02, 'formula_hidden'),
+        ))
+        upkbits(xf, pkd_type_prot, (
+            (2, 0x0004, 'is_style'),
+            (3, 0x0008, 'lotus_123_prefix'), # Meaning is not known.
+        ))
+        upkbits(xf.alignment, pkd_align_par, (
+            (0, 0x07, 'hor_align'),
+            (3, 0x08, 'text_wrapped'),
+        ))
+        upkbits(xf, pkd_align_par, (
+            (4, 0xFFF0, 'parent_style_index'),
+        ))
+        reg = pkd_used >> 2
+        attr_stems = [
+            'format',
+            'font',
+            'alignment',
+            'border',
+            'background',
+            'protection',
+        ]
+        for attr_stem in attr_stems:
+            attr = "_" + attr_stem + "_flag"
+            setattr(xf, attr, reg & 1)
+            reg >>= 1
+        upkbits(xf.background, pkd_bkg_34, (
+            ( 0, 0x003F, 'fill_pattern'),
+            ( 6, 0x07C0, 'pattern_colour_index'),
+            (11, 0xF800, 'background_colour_index'),
+        ))
+        upkbitsL(xf.border, pkd_brd_34, (
+            ( 0, 0x00000007,  'top_line_style'),
+            ( 3, 0x000000F8,  'top_colour_index'),
+            ( 8, 0x00000700,  'left_line_style'),
+            (11, 0x0000F800,  'left_colour_index'),
+            (16, 0x00070000,  'bottom_line_style'),
+            (19, 0x00F80000,  'bottom_colour_index'),
+            (24, 0x07000000,  'right_line_style'),
+            (27, 0xF8000000, 'right_colour_index'),
+        ))
+        xf.alignment.vert_align = 2 # bottom
+        xf.alignment.rotation = 0
+    elif bv == 21:
+        ## Warning: incomplete treatment; formatting_info not fully supported.
+        ## Probably need to offset incoming BIFF2 XF[n] to BIFF8-like XF[n+16],
+        ## and create XF[0:16] like the standard ones in BIFF8 *AND* add 16 to
+        ## all XF references in cell records :-(
+        (xf.font_index, format_etc, halign_etc) = unpack('<BxBB', data)
+        xf.format_key = format_etc & 0x3F
+        upkbits(xf.protection, format_etc, (
+            (6, 0x40, 'cell_locked'),
+            (7, 0x80, 'formula_hidden'),
+        ))
+        upkbits(xf.alignment, halign_etc, (
+            (0, 0x07, 'hor_align'),
+        ))
+        for mask, side in ((0x08, 'left'), (0x10, 'right'), (0x20, 'top'), (0x40, 'bottom')):
+            if halign_etc & mask:
+                colour_index, line_style = 8, 1 # black, thin
+            else:
+                colour_index, line_style = 0, 0 # none, none
+            setattr(xf.border, side + '_colour_index', colour_index)
+            setattr(xf.border, side + '_line_style', line_style)
+        bg = xf.background
+        if halign_etc & 0x80:
+            bg.fill_pattern = 17
+        else:
+            bg.fill_pattern = 0
+        bg.background_colour_index = 9 # white
+        bg.pattern_colour_index = 8 # black
+        xf.parent_style_index = 0 # ???????????
+        xf.alignment.vert_align = 2 # bottom
+        xf.alignment.rotation = 0
+        attr_stems = [
+            'format',
+            'font',
+            'alignment',
+            'border',
+            'background',
+            'protection',
+        ]
+        for attr_stem in attr_stems:
+            attr = "_" + attr_stem + "_flag"
+            setattr(xf, attr, 1)
+    else:
+        raise XLRDError('programmer stuff-up: bv=%d' % bv)
+
+    xf.xf_index = len(self.xf_list)
+    self.xf_list.append(xf)
+    self.xfcount += 1
+    if blah:
+        xf.dump(
+            self.logfile,
+            header="--- handle_xf: xf[%d] ---" % xf.xf_index,
+            footer=" ",
+        )
+    try:
+        fmt = self.format_map[xf.format_key]
+        cellty = _cellty_from_fmtty[fmt.type]
+    except KeyError:
+        cellty = XL_CELL_NUMBER
+    self._xf_index_to_xl_type_map[xf.xf_index] = cellty
+
+    # Now for some assertions ...
+    if self.formatting_info:
+        if self.verbosity and xf.is_style and xf.parent_style_index != 0x0FFF:
+            msg = "WARNING *** XF[%d] is a style XF but parent_style_index is 0x%04x, not 0x0fff\n"
+            fprintf(self.logfile, msg, xf.xf_index, xf.parent_style_index)
+        check_colour_indexes_in_obj(self, xf, xf.xf_index)
+    if xf.format_key not in self.format_map:
+        msg = "WARNING *** XF[%d] unknown (raw) format key (%d, 0x%04x)\n"
+        if self.verbosity:
+            fprintf(self.logfile, msg,
+                xf.xf_index, xf.format_key, xf.format_key)
+        xf.format_key = 0
+
+def xf_epilogue(self):
+    # self is a Book instance.
+    self._xf_epilogue_done = 1
+    num_xfs = len(self.xf_list)
+    blah = DEBUG or self.verbosity >= 3
+    blah1 = DEBUG or self.verbosity >= 1
+    if blah:
+        fprintf(self.logfile, "xf_epilogue called ...\n")
+
+    def check_same(book_arg, xf_arg, parent_arg, attr):
+        # the _arg caper is to avoid a Warning msg from Python 2.1 :-(
+        if getattr(xf_arg, attr) != getattr(parent_arg, attr):
+            fprintf(book_arg.logfile,
+                "NOTE !!! XF[%d] parent[%d] %s different\n",
+                xf_arg.xf_index, parent_arg.xf_index, attr)
+
+    for xfx in xrange(num_xfs):
+        xf = self.xf_list[xfx]
+
+        try:
+            fmt = self.format_map[xf.format_key]
+            cellty = _cellty_from_fmtty[fmt.type]
+        except KeyError:
+            cellty = XL_CELL_TEXT
+        self._xf_index_to_xl_type_map[xf.xf_index] = cellty
+        # Now for some assertions etc
+        if not self.formatting_info:
+            continue
+        if xf.is_style:
+            continue
+        if not(0 <= xf.parent_style_index < num_xfs):
+            if blah1:
+                fprintf(self.logfile,
+                    "WARNING *** XF[%d]: is_style=%d but parent_style_index=%d\n",
+                    xf.xf_index, xf.is_style, xf.parent_style_index)
+            # make it conform
+            xf.parent_style_index = 0
+        if self.biff_version >= 30:
+            if blah1:
+                if xf.parent_style_index == xf.xf_index:
+                    fprintf(self.logfile,
+                        "NOTE !!! XF[%d]: parent_style_index is also %d\n",
+                        xf.xf_index, xf.parent_style_index)
+                elif not self.xf_list[xf.parent_style_index].is_style:
+                    fprintf(self.logfile,
+                        "NOTE !!! XF[%d]: parent_style_index is %d; style flag not set\n",
+                        xf.xf_index, xf.parent_style_index)
+            if blah1 and xf.parent_style_index > xf.xf_index:
+                fprintf(self.logfile,
+                    "NOTE !!! XF[%d]: parent_style_index is %d; out of order?\n",
+                    xf.xf_index, xf.parent_style_index)
+            parent = self.xf_list[xf.parent_style_index]
+            if not xf._alignment_flag and not parent._alignment_flag:
+                if blah1: check_same(self, xf, parent, 'alignment')
+            if not xf._background_flag and not parent._background_flag:
+                if blah1: check_same(self, xf, parent, 'background')
+            if not xf._border_flag and not parent._border_flag:
+                if blah1: check_same(self, xf, parent, 'border')
+            if not xf._protection_flag and not parent._protection_flag:
+                if blah1: check_same(self, xf, parent, 'protection')
+            if not xf._format_flag and not parent._format_flag:
+                if blah1 and xf.format_key != parent.format_key:
+                    fprintf(self.logfile,
+                        "NOTE !!! XF[%d] fmtk=%d, parent[%d] fmtk=%r\n%r / %r\n",
+                        xf.xf_index, xf.format_key, parent.xf_index, parent.format_key,
+                        self.format_map[xf.format_key].format_str,
+                        self.format_map[parent.format_key].format_str)
+            if not xf._font_flag and not parent._font_flag:
+                if blah1 and xf.font_index != parent.font_index:
+                    fprintf(self.logfile,
+                        "NOTE !!! XF[%d] fontx=%d, parent[%d] fontx=%r\n",
+                        xf.xf_index, xf.font_index, parent.xf_index, parent.font_index)
+
+def initialise_book(book):
+    initialise_colour_map(book)
+    book._xf_epilogue_done = 0
+    methods = (
+        handle_font,
+        handle_efont,
+        handle_format,
+        is_date_format_string,
+        handle_palette,
+        palette_epilogue,
+        handle_style,
+        handle_xf,
+        xf_epilogue,
+    )
+    for method in methods:
+        setattr(book.__class__, method.__name__, method)
+
+class XFBorder(BaseObject, EqNeAttrs):
+    """
+    A collection of the border-related attributes of an ``XF`` record.
+    Items correspond to those in the Excel UI's Format -> Cells -> Border tab.
+
+    An explanations of "colour index" is given in :ref:`palette`.
+
+    There are five line style attributes; possible values and the
+    associated meanings are::
+
+      0 = No line,
+      1 = Thin,
+      2 = Medium,
+      3 = Dashed,
+      4 = Dotted,
+      5 = Thick,
+      6 = Double,
+      7 = Hair,
+      8 = Medium dashed,
+      9 = Thin dash-dotted,
+      10 = Medium dash-dotted,
+      11 = Thin dash-dot-dotted,
+      12 = Medium dash-dot-dotted,
+      13 = Slanted medium dash-dotted.
+
+    The line styles 8 to 13 appear in BIFF8 files (Excel 97 and later) only.
+    For pictures of the line styles, refer to OOo docs s3.10 (p22)
+    "Line Styles for Cell Borders (BIFF3-BIFF8)".</p>
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: The colour index for the cell's top line
+    top_colour_index = 0
+    #: The colour index for the cell's bottom line
+    bottom_colour_index = 0
+
+    #: The colour index for the cell's left line
+    left_colour_index = 0
+
+    #: The colour index for the cell's right line
+    right_colour_index = 0
+
+    #: The colour index for the cell's diagonal lines, if any
+    diag_colour_index = 0
+
+    #: The line style for the cell's top line
+    top_line_style = 0
+
+    #: The line style for the cell's bottom line
+    bottom_line_style = 0
+
+    #: The line style for the cell's left line
+    left_line_style = 0
+
+    #: The line style for the cell's right line
+    right_line_style = 0
+
+    #: The line style for the cell's diagonal lines, if any
+    diag_line_style = 0
+
+    #: 1 = draw a diagonal from top left to bottom right
+    diag_down = 0
+
+    #: 1 = draw a diagonal from bottom left to top right
+    diag_up = 0
+
+class XFBackground(BaseObject, EqNeAttrs):
+    """
+    A collection of the background-related attributes of an ``XF`` record.
+    Items correspond to those in the Excel UI's Format -> Cells -> Patterns tab.
+
+    An explanations of "colour index" is given in :ref:`palette`.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: See section 3.11 of the OOo docs.
+    fill_pattern = 0
+
+    #: See section 3.11 of the OOo docs.
+    background_colour_index = 0
+
+    #: See section 3.11 of the OOo docs.
+    pattern_colour_index = 0
+
+
+class XFAlignment(BaseObject, EqNeAttrs):
+    """
+    A collection of the alignment and similar attributes of an ``XF`` record.
+    Items correspond to those in the Excel UI's Format -> Cells -> Alignment tab.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: Values: section 6.115 (p 214) of OOo docs
+    hor_align = 0
+
+    #: Values: section 6.115 (p 215) of OOo docs
+    vert_align = 0
+
+    #: Values: section 6.115 (p 215) of OOo docs.
+    #:
+    #: .. note::
+    #:   file versions BIFF7 and earlier use the documented
+    #:   :attr:`orientation` attribute; this will be mapped (without loss)
+    #:   into :attr:`rotation`.
+    rotation = 0
+
+    #: 1 = text is wrapped at right margin
+    text_wrapped = 0
+
+    #: A number in ``range(15)``.
+    indent_level = 0
+
+    #: 1 = shrink font size to fit text into cell.
+    shrink_to_fit = 0
+
+    #: 0 = according to context; 1 = left-to-right; 2 = right-to-left
+    text_direction = 0
+
+class XFProtection(BaseObject, EqNeAttrs):
+    """
+    A collection of the protection-related attributes of an ``XF`` record.
+    Items correspond to those in the Excel UI's Format -> Cells -> Protection tab.
+    Note the OOo docs include the "cell or style" bit in this bundle of
+    attributes. This is incorrect; the bit is used in determining which bundles
+    to use.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: 1 = Cell is prevented from being changed, moved, resized, or deleted
+    #: (only if the sheet is protected).
+    cell_locked = 0
+
+    #: 1 = Hide formula so that it doesn't appear in the formula bar when
+    #: the cell is selected (only if the sheet is protected).
+    formula_hidden = 0
+
+class XF(BaseObject):
+    """
+    eXtended Formatting information for cells, rows, columns and styles.
+
+    Each of the 6 flags below describes the validity of
+    a specific group of attributes.
+
+    In cell XFs:
+
+    - ``flag==0`` means the attributes of the parent style ``XF`` are
+      used, (but only if the attributes are valid there);
+
+    - ``flag==1`` means the attributes of this ``XF`` are used.
+
+    In style XFs:
+
+    - ``flag==0`` means the attribute setting is valid;
+    - ``flag==1`` means the attribute should be ignored.
+
+    .. note::
+      the API provides both "raw" XFs and "computed" XFs. In the latter case,
+      cell XFs have had the above inheritance mechanism applied.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: 0 = cell XF, 1 = style XF
+    is_style = 0
+
+    #: cell XF: Index into Book.xf_list of this XF's style XF
+    #:
+    #: style XF: 0xFFF
+    parent_style_index = 0
+
+    #
+    _format_flag = 0
+
+    #
+    _font_flag = 0
+
+    #
+    _alignment_flag = 0
+
+    #
+    _border_flag = 0
+
+    #
+    _background_flag = 0
+
+    _protection_flag = 0
+
+    #: Index into :attr:`~xlrd.book.Book.xf_list`
+    xf_index = 0
+
+    #: Index into :attr:`~xlrd.book.Book.font_list`
+    font_index = 0
+
+    #: Key into :attr:`~xlrd.book.Book.format_map`
+    #:
+    #: .. warning::
+    #:   OOo docs on the XF record call this "Index to FORMAT record".
+    #:   It is not an index in the Python sense. It is a key to a map.
+    #:   It is true *only* for Excel 4.0 and earlier files
+    #:   that the key into format_map from an XF instance
+    #:   is the same as the index into format_list, and *only*
+    #:   if the index is less than 164.
+    format_key = 0
+
+    #: An instance of an :class:`XFProtection` object.
+    protection = None
+
+    #: An instance of an :class:`XFBackground` object.
+    background = None
+
+    #: An instance of an :class:`XFAlignment` object.
+    alignment = None
+
+    #: An instance of an :class:`XFBorder` object.
+    border = None
diff --git a/.venv/lib/python3.12/site-packages/xlrd/formula.py b/.venv/lib/python3.12/site-packages/xlrd/formula.py
new file mode 100644
index 00000000..e26639b9
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/formula.py
@@ -0,0 +1,2190 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+# No part of the content of this file was derived from the works of
+# David Giffin.
+"""
+Module for parsing/evaluating Microsoft Excel formulas.
+"""
+
+from __future__ import print_function
+
+import copy
+import operator as opr
+from struct import unpack
+
+from .biffh import (
+    BaseObject, XLRDError, error_text_from_code, hex_char_dump,
+    unpack_string_update_pos, unpack_unicode_update_pos,
+)
+from .timemachine import *
+
+__all__ = [
+    'oBOOL', 'oERR', 'oNUM', 'oREF', 'oREL', 'oSTRG', 'oUNK',
+    'decompile_formula',
+    'dump_formula',
+    'evaluate_name_formula',
+    'okind_dict',
+    'rangename3d', 'rangename3drel', 'cellname', 'cellnameabs', 'colname',
+    'FMLA_TYPE_CELL',
+    'FMLA_TYPE_SHARED',
+    'FMLA_TYPE_ARRAY',
+    'FMLA_TYPE_COND_FMT',
+    'FMLA_TYPE_DATA_VAL',
+    'FMLA_TYPE_NAME',
+    'Operand', 'Ref3D',
+]
+
+FMLA_TYPE_CELL = 1
+FMLA_TYPE_SHARED = 2
+FMLA_TYPE_ARRAY = 4
+FMLA_TYPE_COND_FMT = 8
+FMLA_TYPE_DATA_VAL = 16
+FMLA_TYPE_NAME = 32
+ALL_FMLA_TYPES = 63
+
+
+FMLA_TYPEDESCR_MAP = {
+    1 : 'CELL',
+    2 : 'SHARED',
+    4 : 'ARRAY',
+    8 : 'COND-FMT',
+    16: 'DATA-VAL',
+    32: 'NAME',
+}
+
+_TOKEN_NOT_ALLOWED = {
+    0x01:   ALL_FMLA_TYPES - FMLA_TYPE_CELL, # tExp
+    0x02:   ALL_FMLA_TYPES - FMLA_TYPE_CELL, # tTbl
+    0x0F:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tIsect
+    0x10:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tUnion/List
+    0x11:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tRange
+    0x20:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tArray
+    0x23:   FMLA_TYPE_SHARED, # tName
+    0x39:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tNameX
+    0x3A:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tRef3d
+    0x3B:   FMLA_TYPE_SHARED + FMLA_TYPE_COND_FMT + FMLA_TYPE_DATA_VAL, # tArea3d
+    0x2C:   FMLA_TYPE_CELL + FMLA_TYPE_ARRAY, # tRefN
+    0x2D:   FMLA_TYPE_CELL + FMLA_TYPE_ARRAY, # tAreaN
+    # plus weird stuff like tMem*
+}.get
+
+oBOOL = 3
+oERR =  4
+oMSNG = 5 # tMissArg
+oNUM =  2
+oREF = -1
+oREL = -2
+oSTRG = 1
+oUNK =  0
+
+okind_dict = {
+    -2: "oREL",
+    -1: "oREF",
+    0 : "oUNK",
+    1 : "oSTRG",
+    2 : "oNUM",
+    3 : "oBOOL",
+    4 : "oERR",
+    5 : "oMSNG",
+}
+
+listsep = ',' #### probably should depend on locale
+
+
+# sztabN[opcode] -> the number of bytes to consume.
+# -1 means variable
+# -2 means this opcode not implemented in this version.
+# Which N to use? Depends on biff_version; see szdict.
+sztab0 = [-2, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -2, -1, 8, 4, 2, 2, 3, 9, 8, 2, 3, 8, 4, 7, 5, 5, 5, 2, 4, 7, 4, 7, 2, 2, -2, -2, -2, -2, -2, -2, -2, -2, 3, -2, -2, -2, -2, -2, -2, -2]
+sztab1 = [-2, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -2, -1, 11, 5, 2, 2, 3, 9, 9, 2, 3, 11, 4, 7, 7, 7, 7, 3, 4, 7, 4, 7, 3, 3, -2, -2, -2, -2, -2, -2, -2, -2, 3, -2, -2, -2, -2, -2, -2, -2]
+sztab2 = [-2, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -2, -1, 11, 5, 2, 2, 3, 9, 9, 3, 4, 11, 4, 7, 7, 7, 7, 3, 4, 7, 4, 7, 3, 3, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2]
+sztab3 = [-2, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -2, -1, -2, -2, 2, 2, 3, 9, 9, 3, 4, 15, 4, 7, 7, 7, 7, 3, 4, 7, 4, 7, 3, 3, -2, -2, -2, -2, -2, -2, -2, -2, -2, 25, 18, 21, 18, 21, -2, -2]
+sztab4 = [-2, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -2, -2, 2, 2, 3, 9, 9, 3, 4, 5, 5, 9, 7, 7, 7, 3, 5, 9, 5, 9, 3, 3, -2, -2, -2, -2, -2, -2, -2, -2, -2, 7, 7, 11, 7, 11, -2, -2]
+
+szdict = {
+    20 : sztab0,
+    21 : sztab0,
+    30 : sztab1,
+    40 : sztab2,
+    45 : sztab2,
+    50 : sztab3,
+    70 : sztab3,
+    80 : sztab4,
+}
+
+# For debugging purposes ... the name for each opcode
+# (without the prefix "t" used on OOo docs)
+onames = ['Unk00', 'Exp', 'Tbl', 'Add', 'Sub', 'Mul', 'Div', 'Power', 'Concat', 'LT', 'LE', 'EQ', 'GE', 'GT', 'NE', 'Isect', 'List', 'Range', 'Uplus', 'Uminus', 'Percent', 'Paren', 'MissArg', 'Str', 'Extended', 'Attr', 'Sheet', 'EndSheet', 'Err', 'Bool', 'Int', 'Num', 'Array', 'Func', 'FuncVar', 'Name', 'Ref', 'Area', 'MemArea', 'MemErr', 'MemNoMem', 'MemFunc', 'RefErr', 'AreaErr', 'RefN', 'AreaN', 'MemAreaN', 'MemNoMemN', '', '', '', '', '', '', '', '', 'FuncCE', 'NameX', 'Ref3d', 'Area3d', 'RefErr3d', 'AreaErr3d', '', '']
+
+func_defs = {
+    # index: (name, min#args, max#args, flags, #known_args, return_type, kargs)
+    0  : ('COUNT',            0, 30, 0x04,  1, 'V', 'R'),
+    1  : ('IF',               2,  3, 0x04,  3, 'V', 'VRR'),
+    2  : ('ISNA',             1,  1, 0x02,  1, 'V', 'V'),
+    3  : ('ISERROR',          1,  1, 0x02,  1, 'V', 'V'),
+    4  : ('SUM',              0, 30, 0x04,  1, 'V', 'R'),
+    5  : ('AVERAGE',          1, 30, 0x04,  1, 'V', 'R'),
+    6  : ('MIN',              1, 30, 0x04,  1, 'V', 'R'),
+    7  : ('MAX',              1, 30, 0x04,  1, 'V', 'R'),
+    8  : ('ROW',              0,  1, 0x04,  1, 'V', 'R'),
+    9  : ('COLUMN',           0,  1, 0x04,  1, 'V', 'R'),
+    10 : ('NA',               0,  0, 0x02,  0, 'V', ''),
+    11 : ('NPV',              2, 30, 0x04,  2, 'V', 'VR'),
+    12 : ('STDEV',            1, 30, 0x04,  1, 'V', 'R'),
+    13 : ('DOLLAR',           1,  2, 0x04,  1, 'V', 'V'),
+    14 : ('FIXED',            2,  3, 0x04,  3, 'V', 'VVV'),
+    15 : ('SIN',              1,  1, 0x02,  1, 'V', 'V'),
+    16 : ('COS',              1,  1, 0x02,  1, 'V', 'V'),
+    17 : ('TAN',              1,  1, 0x02,  1, 'V', 'V'),
+    18 : ('ATAN',             1,  1, 0x02,  1, 'V', 'V'),
+    19 : ('PI',               0,  0, 0x02,  0, 'V', ''),
+    20 : ('SQRT',             1,  1, 0x02,  1, 'V', 'V'),
+    21 : ('EXP',              1,  1, 0x02,  1, 'V', 'V'),
+    22 : ('LN',               1,  1, 0x02,  1, 'V', 'V'),
+    23 : ('LOG10',            1,  1, 0x02,  1, 'V', 'V'),
+    24 : ('ABS',              1,  1, 0x02,  1, 'V', 'V'),
+    25 : ('INT',              1,  1, 0x02,  1, 'V', 'V'),
+    26 : ('SIGN',             1,  1, 0x02,  1, 'V', 'V'),
+    27 : ('ROUND',            2,  2, 0x02,  2, 'V', 'VV'),
+    28 : ('LOOKUP',           2,  3, 0x04,  2, 'V', 'VR'),
+    29 : ('INDEX',            2,  4, 0x0c,  4, 'R', 'RVVV'),
+    30 : ('REPT',             2,  2, 0x02,  2, 'V', 'VV'),
+    31 : ('MID',              3,  3, 0x02,  3, 'V', 'VVV'),
+    32 : ('LEN',              1,  1, 0x02,  1, 'V', 'V'),
+    33 : ('VALUE',            1,  1, 0x02,  1, 'V', 'V'),
+    34 : ('TRUE',             0,  0, 0x02,  0, 'V', ''),
+    35 : ('FALSE',            0,  0, 0x02,  0, 'V', ''),
+    36 : ('AND',              1, 30, 0x04,  1, 'V', 'R'),
+    37 : ('OR',               1, 30, 0x04,  1, 'V', 'R'),
+    38 : ('NOT',              1,  1, 0x02,  1, 'V', 'V'),
+    39 : ('MOD',              2,  2, 0x02,  2, 'V', 'VV'),
+    40 : ('DCOUNT',           3,  3, 0x02,  3, 'V', 'RRR'),
+    41 : ('DSUM',             3,  3, 0x02,  3, 'V', 'RRR'),
+    42 : ('DAVERAGE',         3,  3, 0x02,  3, 'V', 'RRR'),
+    43 : ('DMIN',             3,  3, 0x02,  3, 'V', 'RRR'),
+    44 : ('DMAX',             3,  3, 0x02,  3, 'V', 'RRR'),
+    45 : ('DSTDEV',           3,  3, 0x02,  3, 'V', 'RRR'),
+    46 : ('VAR',              1, 30, 0x04,  1, 'V', 'R'),
+    47 : ('DVAR',             3,  3, 0x02,  3, 'V', 'RRR'),
+    48 : ('TEXT',             2,  2, 0x02,  2, 'V', 'VV'),
+    49 : ('LINEST',           1,  4, 0x04,  4, 'A', 'RRVV'),
+    50 : ('TREND',            1,  4, 0x04,  4, 'A', 'RRRV'),
+    51 : ('LOGEST',           1,  4, 0x04,  4, 'A', 'RRVV'),
+    52 : ('GROWTH',           1,  4, 0x04,  4, 'A', 'RRRV'),
+    56 : ('PV',               3,  5, 0x04,  5, 'V', 'VVVVV'),
+    57 : ('FV',               3,  5, 0x04,  5, 'V', 'VVVVV'),
+    58 : ('NPER',             3,  5, 0x04,  5, 'V', 'VVVVV'),
+    59 : ('PMT',              3,  5, 0x04,  5, 'V', 'VVVVV'),
+    60 : ('RATE',             3,  6, 0x04,  6, 'V', 'VVVVVV'),
+    61 : ('MIRR',             3,  3, 0x02,  3, 'V', 'RVV'),
+    62 : ('IRR',              1,  2, 0x04,  2, 'V', 'RV'),
+    63 : ('RAND',             0,  0, 0x0a,  0, 'V', ''),
+    64 : ('MATCH',            2,  3, 0x04,  3, 'V', 'VRR'),
+    65 : ('DATE',             3,  3, 0x02,  3, 'V', 'VVV'),
+    66 : ('TIME',             3,  3, 0x02,  3, 'V', 'VVV'),
+    67 : ('DAY',              1,  1, 0x02,  1, 'V', 'V'),
+    68 : ('MONTH',            1,  1, 0x02,  1, 'V', 'V'),
+    69 : ('YEAR',             1,  1, 0x02,  1, 'V', 'V'),
+    70 : ('WEEKDAY',          1,  2, 0x04,  2, 'V', 'VV'),
+    71 : ('HOUR',             1,  1, 0x02,  1, 'V', 'V'),
+    72 : ('MINUTE',           1,  1, 0x02,  1, 'V', 'V'),
+    73 : ('SECOND',           1,  1, 0x02,  1, 'V', 'V'),
+    74 : ('NOW',              0,  0, 0x0a,  0, 'V', ''),
+    75 : ('AREAS',            1,  1, 0x02,  1, 'V', 'R'),
+    76 : ('ROWS',             1,  1, 0x02,  1, 'V', 'R'),
+    77 : ('COLUMNS',          1,  1, 0x02,  1, 'V', 'R'),
+    78 : ('OFFSET',           3,  5, 0x04,  5, 'R', 'RVVVV'),
+    82 : ('SEARCH',           2,  3, 0x04,  3, 'V', 'VVV'),
+    83 : ('TRANSPOSE',        1,  1, 0x02,  1, 'A', 'A'),
+    86 : ('TYPE',             1,  1, 0x02,  1, 'V', 'V'),
+    92 : ('SERIESSUM',        4,  4, 0x02,  4, 'V', 'VVVA'),
+    97 : ('ATAN2',            2,  2, 0x02,  2, 'V', 'VV'),
+    98 : ('ASIN',             1,  1, 0x02,  1, 'V', 'V'),
+    99 : ('ACOS',             1,  1, 0x02,  1, 'V', 'V'),
+    100: ('CHOOSE',           2, 30, 0x04,  2, 'V', 'VR'),
+    101: ('HLOOKUP',          3,  4, 0x04,  4, 'V', 'VRRV'),
+    102: ('VLOOKUP',          3,  4, 0x04,  4, 'V', 'VRRV'),
+    105: ('ISREF',            1,  1, 0x02,  1, 'V', 'R'),
+    109: ('LOG',              1,  2, 0x04,  2, 'V', 'VV'),
+    111: ('CHAR',             1,  1, 0x02,  1, 'V', 'V'),
+    112: ('LOWER',            1,  1, 0x02,  1, 'V', 'V'),
+    113: ('UPPER',            1,  1, 0x02,  1, 'V', 'V'),
+    114: ('PROPER',           1,  1, 0x02,  1, 'V', 'V'),
+    115: ('LEFT',             1,  2, 0x04,  2, 'V', 'VV'),
+    116: ('RIGHT',            1,  2, 0x04,  2, 'V', 'VV'),
+    117: ('EXACT',            2,  2, 0x02,  2, 'V', 'VV'),
+    118: ('TRIM',             1,  1, 0x02,  1, 'V', 'V'),
+    119: ('REPLACE',          4,  4, 0x02,  4, 'V', 'VVVV'),
+    120: ('SUBSTITUTE',       3,  4, 0x04,  4, 'V', 'VVVV'),
+    121: ('CODE',             1,  1, 0x02,  1, 'V', 'V'),
+    124: ('FIND',             2,  3, 0x04,  3, 'V', 'VVV'),
+    125: ('CELL',             1,  2, 0x0c,  2, 'V', 'VR'),
+    126: ('ISERR',            1,  1, 0x02,  1, 'V', 'V'),
+    127: ('ISTEXT',           1,  1, 0x02,  1, 'V', 'V'),
+    128: ('ISNUMBER',         1,  1, 0x02,  1, 'V', 'V'),
+    129: ('ISBLANK',          1,  1, 0x02,  1, 'V', 'V'),
+    130: ('T',                1,  1, 0x02,  1, 'V', 'R'),
+    131: ('N',                1,  1, 0x02,  1, 'V', 'R'),
+    140: ('DATEVALUE',        1,  1, 0x02,  1, 'V', 'V'),
+    141: ('TIMEVALUE',        1,  1, 0x02,  1, 'V', 'V'),
+    142: ('SLN',              3,  3, 0x02,  3, 'V', 'VVV'),
+    143: ('SYD',              4,  4, 0x02,  4, 'V', 'VVVV'),
+    144: ('DDB',              4,  5, 0x04,  5, 'V', 'VVVVV'),
+    148: ('INDIRECT',         1,  2, 0x0c,  2, 'R', 'VV'),
+    162: ('CLEAN',            1,  1, 0x02,  1, 'V', 'V'),
+    163: ('MDETERM',          1,  1, 0x02,  1, 'V', 'A'),
+    164: ('MINVERSE',         1,  1, 0x02,  1, 'A', 'A'),
+    165: ('MMULT',            2,  2, 0x02,  2, 'A', 'AA'),
+    167: ('IPMT',             4,  6, 0x04,  6, 'V', 'VVVVVV'),
+    168: ('PPMT',             4,  6, 0x04,  6, 'V', 'VVVVVV'),
+    169: ('COUNTA',           0, 30, 0x04,  1, 'V', 'R'),
+    183: ('PRODUCT',          0, 30, 0x04,  1, 'V', 'R'),
+    184: ('FACT',             1,  1, 0x02,  1, 'V', 'V'),
+    189: ('DPRODUCT',         3,  3, 0x02,  3, 'V', 'RRR'),
+    190: ('ISNONTEXT',        1,  1, 0x02,  1, 'V', 'V'),
+    193: ('STDEVP',           1, 30, 0x04,  1, 'V', 'R'),
+    194: ('VARP',             1, 30, 0x04,  1, 'V', 'R'),
+    195: ('DSTDEVP',          3,  3, 0x02,  3, 'V', 'RRR'),
+    196: ('DVARP',            3,  3, 0x02,  3, 'V', 'RRR'),
+    197: ('TRUNC',            1,  2, 0x04,  2, 'V', 'VV'),
+    198: ('ISLOGICAL',        1,  1, 0x02,  1, 'V', 'V'),
+    199: ('DCOUNTA',          3,  3, 0x02,  3, 'V', 'RRR'),
+    204: ('USDOLLAR',         1,  2, 0x04,  2, 'V', 'VV'),
+    205: ('FINDB',            2,  3, 0x04,  3, 'V', 'VVV'),
+    206: ('SEARCHB',          2,  3, 0x04,  3, 'V', 'VVV'),
+    207: ('REPLACEB',         4,  4, 0x02,  4, 'V', 'VVVV'),
+    208: ('LEFTB',            1,  2, 0x04,  2, 'V', 'VV'),
+    209: ('RIGHTB',           1,  2, 0x04,  2, 'V', 'VV'),
+    210: ('MIDB',             3,  3, 0x02,  3, 'V', 'VVV'),
+    211: ('LENB',             1,  1, 0x02,  1, 'V', 'V'),
+    212: ('ROUNDUP',          2,  2, 0x02,  2, 'V', 'VV'),
+    213: ('ROUNDDOWN',        2,  2, 0x02,  2, 'V', 'VV'),
+    214: ('ASC',              1,  1, 0x02,  1, 'V', 'V'),
+    215: ('DBCS',             1,  1, 0x02,  1, 'V', 'V'),
+    216: ('RANK',             2,  3, 0x04,  3, 'V', 'VRV'),
+    219: ('ADDRESS',          2,  5, 0x04,  5, 'V', 'VVVVV'),
+    220: ('DAYS360',          2,  3, 0x04,  3, 'V', 'VVV'),
+    221: ('TODAY',            0,  0, 0x0a,  0, 'V', ''),
+    222: ('VDB',              5,  7, 0x04,  7, 'V', 'VVVVVVV'),
+    227: ('MEDIAN',           1, 30, 0x04,  1, 'V', 'R'),
+    228: ('SUMPRODUCT',       1, 30, 0x04,  1, 'V', 'A'),
+    229: ('SINH',             1,  1, 0x02,  1, 'V', 'V'),
+    230: ('COSH',             1,  1, 0x02,  1, 'V', 'V'),
+    231: ('TANH',             1,  1, 0x02,  1, 'V', 'V'),
+    232: ('ASINH',            1,  1, 0x02,  1, 'V', 'V'),
+    233: ('ACOSH',            1,  1, 0x02,  1, 'V', 'V'),
+    234: ('ATANH',            1,  1, 0x02,  1, 'V', 'V'),
+    235: ('DGET',             3,  3, 0x02,  3, 'V', 'RRR'),
+    244: ('INFO',             1,  1, 0x02,  1, 'V', 'V'),
+    247: ('DB',               4,  5, 0x04,  5, 'V', 'VVVVV'),
+    252: ('FREQUENCY',        2,  2, 0x02,  2, 'A', 'RR'),
+    261: ('ERROR.TYPE',       1,  1, 0x02,  1, 'V', 'V'),
+    269: ('AVEDEV',           1, 30, 0x04,  1, 'V', 'R'),
+    270: ('BETADIST',         3,  5, 0x04,  1, 'V', 'V'),
+    271: ('GAMMALN',          1,  1, 0x02,  1, 'V', 'V'),
+    272: ('BETAINV',          3,  5, 0x04,  1, 'V', 'V'),
+    273: ('BINOMDIST',        4,  4, 0x02,  4, 'V', 'VVVV'),
+    274: ('CHIDIST',          2,  2, 0x02,  2, 'V', 'VV'),
+    275: ('CHIINV',           2,  2, 0x02,  2, 'V', 'VV'),
+    276: ('COMBIN',           2,  2, 0x02,  2, 'V', 'VV'),
+    277: ('CONFIDENCE',       3,  3, 0x02,  3, 'V', 'VVV'),
+    278: ('CRITBINOM',        3,  3, 0x02,  3, 'V', 'VVV'),
+    279: ('EVEN',             1,  1, 0x02,  1, 'V', 'V'),
+    280: ('EXPONDIST',        3,  3, 0x02,  3, 'V', 'VVV'),
+    281: ('FDIST',            3,  3, 0x02,  3, 'V', 'VVV'),
+    282: ('FINV',             3,  3, 0x02,  3, 'V', 'VVV'),
+    283: ('FISHER',           1,  1, 0x02,  1, 'V', 'V'),
+    284: ('FISHERINV',        1,  1, 0x02,  1, 'V', 'V'),
+    285: ('FLOOR',            2,  2, 0x02,  2, 'V', 'VV'),
+    286: ('GAMMADIST',        4,  4, 0x02,  4, 'V', 'VVVV'),
+    287: ('GAMMAINV',         3,  3, 0x02,  3, 'V', 'VVV'),
+    288: ('CEILING',          2,  2, 0x02,  2, 'V', 'VV'),
+    289: ('HYPGEOMDIST',      4,  4, 0x02,  4, 'V', 'VVVV'),
+    290: ('LOGNORMDIST',      3,  3, 0x02,  3, 'V', 'VVV'),
+    291: ('LOGINV',           3,  3, 0x02,  3, 'V', 'VVV'),
+    292: ('NEGBINOMDIST',     3,  3, 0x02,  3, 'V', 'VVV'),
+    293: ('NORMDIST',         4,  4, 0x02,  4, 'V', 'VVVV'),
+    294: ('NORMSDIST',        1,  1, 0x02,  1, 'V', 'V'),
+    295: ('NORMINV',          3,  3, 0x02,  3, 'V', 'VVV'),
+    296: ('NORMSINV',         1,  1, 0x02,  1, 'V', 'V'),
+    297: ('STANDARDIZE',      3,  3, 0x02,  3, 'V', 'VVV'),
+    298: ('ODD',              1,  1, 0x02,  1, 'V', 'V'),
+    299: ('PERMUT',           2,  2, 0x02,  2, 'V', 'VV'),
+    300: ('POISSON',          3,  3, 0x02,  3, 'V', 'VVV'),
+    301: ('TDIST',            3,  3, 0x02,  3, 'V', 'VVV'),
+    302: ('WEIBULL',          4,  4, 0x02,  4, 'V', 'VVVV'),
+    303: ('SUMXMY2',          2,  2, 0x02,  2, 'V', 'AA'),
+    304: ('SUMX2MY2',         2,  2, 0x02,  2, 'V', 'AA'),
+    305: ('SUMX2PY2',         2,  2, 0x02,  2, 'V', 'AA'),
+    306: ('CHITEST',          2,  2, 0x02,  2, 'V', 'AA'),
+    307: ('CORREL',           2,  2, 0x02,  2, 'V', 'AA'),
+    308: ('COVAR',            2,  2, 0x02,  2, 'V', 'AA'),
+    309: ('FORECAST',         3,  3, 0x02,  3, 'V', 'VAA'),
+    310: ('FTEST',            2,  2, 0x02,  2, 'V', 'AA'),
+    311: ('INTERCEPT',        2,  2, 0x02,  2, 'V', 'AA'),
+    312: ('PEARSON',          2,  2, 0x02,  2, 'V', 'AA'),
+    313: ('RSQ',              2,  2, 0x02,  2, 'V', 'AA'),
+    314: ('STEYX',            2,  2, 0x02,  2, 'V', 'AA'),
+    315: ('SLOPE',            2,  2, 0x02,  2, 'V', 'AA'),
+    316: ('TTEST',            4,  4, 0x02,  4, 'V', 'AAVV'),
+    317: ('PROB',             3,  4, 0x04,  3, 'V', 'AAV'),
+    318: ('DEVSQ',            1, 30, 0x04,  1, 'V', 'R'),
+    319: ('GEOMEAN',          1, 30, 0x04,  1, 'V', 'R'),
+    320: ('HARMEAN',          1, 30, 0x04,  1, 'V', 'R'),
+    321: ('SUMSQ',            0, 30, 0x04,  1, 'V', 'R'),
+    322: ('KURT',             1, 30, 0x04,  1, 'V', 'R'),
+    323: ('SKEW',             1, 30, 0x04,  1, 'V', 'R'),
+    324: ('ZTEST',            2,  3, 0x04,  2, 'V', 'RV'),
+    325: ('LARGE',            2,  2, 0x02,  2, 'V', 'RV'),
+    326: ('SMALL',            2,  2, 0x02,  2, 'V', 'RV'),
+    327: ('QUARTILE',         2,  2, 0x02,  2, 'V', 'RV'),
+    328: ('PERCENTILE',       2,  2, 0x02,  2, 'V', 'RV'),
+    329: ('PERCENTRANK',      2,  3, 0x04,  2, 'V', 'RV'),
+    330: ('MODE',             1, 30, 0x04,  1, 'V', 'A'),
+    331: ('TRIMMEAN',         2,  2, 0x02,  2, 'V', 'RV'),
+    332: ('TINV',             2,  2, 0x02,  2, 'V', 'VV'),
+    336: ('CONCATENATE',      0, 30, 0x04,  1, 'V', 'V'),
+    337: ('POWER',            2,  2, 0x02,  2, 'V', 'VV'),
+    342: ('RADIANS',          1,  1, 0x02,  1, 'V', 'V'),
+    343: ('DEGREES',          1,  1, 0x02,  1, 'V', 'V'),
+    344: ('SUBTOTAL',         2, 30, 0x04,  2, 'V', 'VR'),
+    345: ('SUMIF',            2,  3, 0x04,  3, 'V', 'RVR'),
+    346: ('COUNTIF',          2,  2, 0x02,  2, 'V', 'RV'),
+    347: ('COUNTBLANK',       1,  1, 0x02,  1, 'V', 'R'),
+    350: ('ISPMT',            4,  4, 0x02,  4, 'V', 'VVVV'),
+    351: ('DATEDIF',          3,  3, 0x02,  3, 'V', 'VVV'),
+    352: ('DATESTRING',       1,  1, 0x02,  1, 'V', 'V'),
+    353: ('NUMBERSTRING',     2,  2, 0x02,  2, 'V', 'VV'),
+    354: ('ROMAN',            1,  2, 0x04,  2, 'V', 'VV'),
+    358: ('GETPIVOTDATA',     2,  2, 0x02,  2, 'V', 'RV'),
+    359: ('HYPERLINK',        1,  2, 0x04,  2, 'V', 'VV'),
+    360: ('PHONETIC',         1,  1, 0x02,  1, 'V', 'V'),
+    361: ('AVERAGEA',         1, 30, 0x04,  1, 'V', 'R'),
+    362: ('MAXA',             1, 30, 0x04,  1, 'V', 'R'),
+    363: ('MINA',             1, 30, 0x04,  1, 'V', 'R'),
+    364: ('STDEVPA',          1, 30, 0x04,  1, 'V', 'R'),
+    365: ('VARPA',            1, 30, 0x04,  1, 'V', 'R'),
+    366: ('STDEVA',           1, 30, 0x04,  1, 'V', 'R'),
+    367: ('VARA',             1, 30, 0x04,  1, 'V', 'R'),
+    368: ('BAHTTEXT',         1,  1, 0x02,  1, 'V', 'V'),
+    369: ('THAIDAYOFWEEK',    1,  1, 0x02,  1, 'V', 'V'),
+    370: ('THAIDIGIT',        1,  1, 0x02,  1, 'V', 'V'),
+    371: ('THAIMONTHOFYEAR',  1,  1, 0x02,  1, 'V', 'V'),
+    372: ('THAINUMSOUND',     1,  1, 0x02,  1, 'V', 'V'),
+    373: ('THAINUMSTRING',    1,  1, 0x02,  1, 'V', 'V'),
+    374: ('THAISTRINGLENGTH', 1,  1, 0x02,  1, 'V', 'V'),
+    375: ('ISTHAIDIGIT',      1,  1, 0x02,  1, 'V', 'V'),
+    376: ('ROUNDBAHTDOWN',    1,  1, 0x02,  1, 'V', 'V'),
+    377: ('ROUNDBAHTUP',      1,  1, 0x02,  1, 'V', 'V'),
+    378: ('THAIYEAR',         1,  1, 0x02,  1, 'V', 'V'),
+    379: ('RTD',              2,  5, 0x04,  1, 'V', 'V'),
+}
+
+tAttrNames = {
+    0x00: "Skip??", # seen in SAMPLES.XLS which shipped with Excel 5.0
+    0x01: "Volatile",
+    0x02: "If",
+    0x04: "Choose",
+    0x08: "Skip",
+    0x10: "Sum",
+    0x20: "Assign",
+    0x40: "Space",
+    0x41: "SpaceVolatile",
+}
+
+error_opcodes = set([0x07, 0x08, 0x0A, 0x0B, 0x1C, 0x1D, 0x2F])
+
+tRangeFuncs = (min, max, min, max, min, max)
+tIsectFuncs = (max, min, max, min, max, min)
+
+def do_box_funcs(box_funcs, boxa, boxb):
+    return tuple(
+        func(numa, numb)
+        for func, numa, numb in zip(box_funcs, boxa.coords, boxb.coords)
+    )
+
+def adjust_cell_addr_biff8(rowval, colval, reldelta, browx=None, bcolx=None):
+    row_rel = (colval >> 15) & 1
+    col_rel = (colval >> 14) & 1
+    rowx = rowval
+    colx = colval & 0xff
+    if reldelta:
+        if row_rel and rowx >= 32768:
+            rowx -= 65536
+        if col_rel and colx >= 128:
+            colx -= 256
+    else:
+        if row_rel:
+            rowx -= browx
+        if col_rel:
+            colx -= bcolx
+    return rowx, colx, row_rel, col_rel
+
+def adjust_cell_addr_biff_le7(
+        rowval, colval, reldelta, browx=None, bcolx=None):
+    row_rel = (rowval >> 15) & 1
+    col_rel = (rowval >> 14) & 1
+    rowx = rowval & 0x3fff
+    colx = colval
+    if reldelta:
+        if row_rel and rowx >= 8192:
+            rowx -= 16384
+        if col_rel and colx >= 128:
+            colx -= 256
+    else:
+        if row_rel:
+            rowx -= browx
+        if col_rel:
+            colx -= bcolx
+    return rowx, colx, row_rel, col_rel
+
+def get_cell_addr(data, pos, bv, reldelta, browx=None, bcolx=None):
+    if bv >= 80:
+        rowval, colval = unpack("<HH", data[pos:pos+4])
+        # print "    rv=%04xh cv=%04xh" % (rowval, colval)
+        return adjust_cell_addr_biff8(rowval, colval, reldelta, browx, bcolx)
+    else:
+        rowval, colval = unpack("<HB", data[pos:pos+3])
+        # print "    rv=%04xh cv=%04xh" % (rowval, colval)
+        return adjust_cell_addr_biff_le7(
+                    rowval, colval, reldelta, browx, bcolx)
+
+def get_cell_range_addr(data, pos, bv, reldelta, browx=None, bcolx=None):
+    if bv >= 80:
+        row1val, row2val, col1val, col2val = unpack("<HHHH", data[pos:pos+8])
+        # print "    rv=%04xh cv=%04xh" % (row1val, col1val)
+        # print "    rv=%04xh cv=%04xh" % (row2val, col2val)
+        res1 = adjust_cell_addr_biff8(row1val, col1val, reldelta, browx, bcolx)
+        res2 = adjust_cell_addr_biff8(row2val, col2val, reldelta, browx, bcolx)
+        return res1, res2
+    else:
+        row1val, row2val, col1val, col2val = unpack("<HHBB", data[pos:pos+6])
+        # print "    rv=%04xh cv=%04xh" % (row1val, col1val)
+        # print "    rv=%04xh cv=%04xh" % (row2val, col2val)
+        res1 = adjust_cell_addr_biff_le7(
+                    row1val, col1val, reldelta, browx, bcolx)
+        res2 = adjust_cell_addr_biff_le7(
+                    row2val, col2val, reldelta, browx, bcolx)
+        return res1, res2
+
+def get_externsheet_local_range(bk, refx, blah=0):
+    try:
+        info = bk._externsheet_info[refx]
+    except IndexError:
+        print("!!! get_externsheet_local_range: refx=%d, not in range(%d)"
+            % (refx, len(bk._externsheet_info)), file=bk.logfile)
+        return (-101, -101)
+    ref_recordx, ref_first_sheetx, ref_last_sheetx = info
+    if ref_recordx == bk._supbook_addins_inx:
+        if blah:
+            print("/// get_externsheet_local_range(refx=%d) -> addins %r" % (refx, info), file=bk.logfile)
+        assert ref_first_sheetx == 0xFFFE == ref_last_sheetx
+        return (-5, -5)
+    if ref_recordx != bk._supbook_locals_inx:
+        if blah:
+            print("/// get_externsheet_local_range(refx=%d) -> external %r" % (refx, info), file=bk.logfile)
+        return (-4, -4) # external reference
+    if ref_first_sheetx == 0xFFFE == ref_last_sheetx:
+        if blah:
+            print("/// get_externsheet_local_range(refx=%d) -> unspecified sheet %r" % (refx, info), file=bk.logfile)
+        return (-1, -1) # internal reference, any sheet
+    if ref_first_sheetx == 0xFFFF == ref_last_sheetx:
+        if blah:
+            print("/// get_externsheet_local_range(refx=%d) -> deleted sheet(s)" % (refx, ), file=bk.logfile)
+        return (-2, -2) # internal reference, deleted sheet(s)
+    nsheets = len(bk._all_sheets_map)
+    if not(0 <= ref_first_sheetx <= ref_last_sheetx < nsheets):
+        if blah:
+            print("/// get_externsheet_local_range(refx=%d) -> %r" % (refx, info), file=bk.logfile)
+            print("--- first/last sheet not in range(%d)" % nsheets, file=bk.logfile)
+        return (-102, -102) # stuffed up somewhere :-(
+    xlrd_sheetx1 = bk._all_sheets_map[ref_first_sheetx]
+    xlrd_sheetx2 = bk._all_sheets_map[ref_last_sheetx]
+    if not(0 <= xlrd_sheetx1 <= xlrd_sheetx2):
+        return (-3, -3) # internal reference, but to a macro sheet
+    return xlrd_sheetx1, xlrd_sheetx2
+
+def get_externsheet_local_range_b57(
+        bk, raw_extshtx, ref_first_sheetx, ref_last_sheetx, blah=0):
+    if raw_extshtx > 0:
+        if blah:
+            print("/// get_externsheet_local_range_b57(raw_extshtx=%d) -> external" % raw_extshtx, file=bk.logfile)
+        return (-4, -4) # external reference
+    if ref_first_sheetx == -1 and ref_last_sheetx == -1:
+        return (-2, -2) # internal reference, deleted sheet(s)
+    nsheets = len(bk._all_sheets_map)
+    if not(0 <= ref_first_sheetx <= ref_last_sheetx < nsheets):
+        if blah:
+            print("/// get_externsheet_local_range_b57(%d, %d, %d) -> ???"
+                % (raw_extshtx, ref_first_sheetx, ref_last_sheetx), file=bk.logfile)
+            print("--- first/last sheet not in range(%d)" % nsheets, file=bk.logfile)
+        return (-103, -103) # stuffed up somewhere :-(
+    xlrd_sheetx1 = bk._all_sheets_map[ref_first_sheetx]
+    xlrd_sheetx2 = bk._all_sheets_map[ref_last_sheetx]
+    if not(0 <= xlrd_sheetx1 <= xlrd_sheetx2):
+        return (-3, -3) # internal reference, but to a macro sheet
+    return xlrd_sheetx1, xlrd_sheetx2
+
+class FormulaError(Exception):
+    pass
+
+
+class Operand(object):
+    """
+    Used in evaluating formulas.
+    The following table describes the kinds and how their values
+    are represented.
+
+    .. raw:: html
+
+        <table border="1" cellpadding="7">
+        <tr>
+        <th>Kind symbol</th>
+        <th>Kind number</th>
+        <th>Value representation</th>
+        </tr>
+        <tr>
+        <td>oBOOL</td>
+        <td align="center">3</td>
+        <td>integer: 0 => False; 1 => True</td>
+        </tr>
+        <tr>
+        <td>oERR</td>
+        <td align="center">4</td>
+        <td>None, or an int error code (same as XL_CELL_ERROR in the Cell class).
+        </td>
+        </tr>
+        <tr>
+        <td>oMSNG</td>
+        <td align="center">5</td>
+        <td>Used by Excel as a placeholder for a missing (not supplied) function
+        argument. Should *not* appear as a final formula result. Value is None.</td>
+        </tr>
+        <tr>
+        <td>oNUM</td>
+        <td align="center">2</td>
+        <td>A float. Note that there is no way of distinguishing dates.</td>
+        </tr>
+        <tr>
+        <td>oREF</td>
+        <td align="center">-1</td>
+        <td>The value is either None or a non-empty list of
+        absolute Ref3D instances.<br>
+        </td>
+        </tr>
+        <tr>
+        <td>oREL</td>
+        <td align="center">-2</td>
+        <td>The value is None or a non-empty list of
+        fully or partially relative Ref3D instances.
+        </td>
+        </tr>
+        <tr>
+        <td>oSTRG</td>
+        <td align="center">1</td>
+        <td>A Unicode string.</td>
+        </tr>
+        <tr>
+        <td>oUNK</td>
+        <td align="center">0</td>
+        <td>The kind is unknown or ambiguous. The value is None</td>
+        </tr>
+        </table>
+    """
+
+    #: None means that the actual value of the operand is a variable
+    #: (depends on cell data), not a constant.
+    value = None
+
+    #: oUNK means that the kind of operand is not known unambiguously.
+    kind = oUNK
+
+    #: The reconstituted text of the original formula. Function names will be
+    #: in English irrespective of the original language, which doesn't seem
+    #: to be recorded anywhere. The separator is ",", not ";" or whatever else
+    #: might be more appropriate for the end-user's locale; patches welcome.
+    text = '?'
+
+    def __init__(self, akind=None, avalue=None, arank=0, atext='?'):
+        if akind is not None:
+            self.kind = akind
+        if avalue is not None:
+            self.value = avalue
+        self.rank = arank
+        # rank is an internal gizmo (operator precedence);
+        # it's used in reconstructing formula text.
+        self.text = atext
+
+    def __repr__(self):
+        kind_text = okind_dict.get(self.kind, "?Unknown kind?")
+        return "Operand(kind=%s, value=%r, text=%r)" \
+            % (kind_text, self.value, self.text)
+
+
+class Ref3D(tuple):
+    """
+    Represents an absolute or relative 3-dimensional reference to a box
+    of one or more cells.
+
+    The ``coords`` attribute is a tuple of the form::
+
+      (shtxlo, shtxhi, rowxlo, rowxhi, colxlo, colxhi)
+
+    where ``0 <= thingxlo <= thingx < thingxhi``.
+
+    .. note::
+      It is quite possible to have ``thingx > nthings``; for example
+      ``Print_Titles`` could have ``colxhi == 256`` and/or ``rowxhi == 65536``
+      irrespective of how many columns/rows are actually used in the worksheet.
+      The caller will need to decide how to handle this situation.
+      Keyword: :class:`IndexError` :-)
+
+    The components of the coords attribute are also available as individual
+    attributes: ``shtxlo``, ``shtxhi``, ``rowxlo``, ``rowxhi``, ``colxlo``, and
+    ``colxhi``.
+
+    The ``relflags`` attribute is a 6-tuple of flags which indicate whether
+    the corresponding (sheet|row|col)(lo|hi) is relative (1) or absolute (0).
+
+    .. note::
+      There is necessarily no information available as to what cell(s)
+      the reference could possibly be relative to. The caller must decide what
+      if any use to make of ``oREL`` operands.
+
+    .. note:
+      A partially relative reference may well be a typo.
+      For example, define name ``A1Z10`` as ``$a$1:$z10`` (missing ``$`` after
+      ``z``) while the cursor is on cell ``Sheet3!A27``.
+
+      The resulting :class:`Ref3D` instance will have
+      ``coords = (2, 3, 0, -16, 0, 26)``
+      and ``relflags = (0, 0, 0, 1, 0, 0).<br>
+
+      So far, only one possibility of a sheet-relative component in
+      a reference has been noticed: a 2D reference located in the
+      "current sheet".
+
+      This will appear as ``coords = (0, 1, ...)`` and
+      ``relflags = (1, 1, ...)``.
+
+    .. versionadded:: 0.6.0
+    """
+
+    def __init__(self, atuple):
+        self.coords = atuple[0:6]
+        self.relflags = atuple[6:12]
+        if not self.relflags:
+            self.relflags = (0, 0, 0, 0, 0, 0)
+        (self.shtxlo, self.shtxhi,
+        self.rowxlo, self.rowxhi,
+        self.colxlo, self.colxhi) = self.coords
+
+    def __repr__(self):
+        if not self.relflags or self.relflags == (0, 0, 0, 0, 0, 0):
+            return "Ref3D(coords=%r)" % (self.coords, )
+        else:
+            return "Ref3D(coords=%r, relflags=%r)" \
+                % (self.coords, self.relflags)
+
+tAdd = 0x03
+tSub = 0x04
+tMul = 0x05
+tDiv = 0x06
+tPower = 0x07
+tConcat = 0x08
+tLT, tLE, tEQ, tGE, tGT, tNE = range(0x09, 0x0F)
+
+
+def nop(x):
+    return x
+
+def _opr_pow(x, y): return x ** y
+
+def _opr_lt(x, y): return x <  y
+def _opr_le(x, y): return x <= y
+def _opr_eq(x, y): return x == y
+def _opr_ge(x, y): return x >= y
+def _opr_gt(x, y): return x >  y
+def _opr_ne(x, y): return x != y
+
+def num2strg(num):
+    """
+    Attempt to emulate Excel's default conversion from number to string.
+    """
+    s = str(num)
+    if s.endswith(".0"):
+        s = s[:-2]
+    return s
+
+_arith_argdict = {oNUM: nop,     oSTRG: float}
+_cmp_argdict =   {oNUM: nop,     oSTRG: nop}
+# Seems no conversions done on relops; in Excel, "1" > 9 produces TRUE.
+_strg_argdict =  {oNUM:num2strg, oSTRG:nop}
+binop_rules = {
+    tAdd:   (_arith_argdict, oNUM, opr.add,  30, '+'),
+    tSub:   (_arith_argdict, oNUM, opr.sub,  30, '-'),
+    tMul:   (_arith_argdict, oNUM, opr.mul,  40, '*'),
+    tDiv:   (_arith_argdict, oNUM, opr.truediv,  40, '/'),
+    tPower: (_arith_argdict, oNUM, _opr_pow, 50, '^',),
+    tConcat:(_strg_argdict, oSTRG, opr.add,  20, '&'),
+    tLT:    (_cmp_argdict, oBOOL, _opr_lt,   10, '<'),
+    tLE:    (_cmp_argdict, oBOOL, _opr_le,   10, '<='),
+    tEQ:    (_cmp_argdict, oBOOL, _opr_eq,   10, '='),
+    tGE:    (_cmp_argdict, oBOOL, _opr_ge,   10, '>='),
+    tGT:    (_cmp_argdict, oBOOL, _opr_gt,   10, '>'),
+    tNE:    (_cmp_argdict, oBOOL, _opr_ne,   10, '<>'),
+}
+
+unop_rules = {
+    0x13: (lambda x: -x,        70, '-', ''), # unary minus
+    0x12: (lambda x: x,         70, '+', ''), # unary plus
+    0x14: (lambda x: x / 100.0, 60, '',  '%'),# percent
+}
+
+LEAF_RANK = 90
+FUNC_RANK = 90
+
+STACK_ALARM_LEVEL = 5
+STACK_PANIC_LEVEL = 10
+
+def evaluate_name_formula(bk, nobj, namex, blah=0, level=0):
+    if level > STACK_ALARM_LEVEL:
+        blah = 1
+    data = nobj.raw_formula
+    fmlalen = nobj.basic_formula_len
+    bv = bk.biff_version
+    reldelta = 1 # All defined name formulas use "Method B" [OOo docs]
+    if blah:
+        print("::: evaluate_name_formula %r %r %d %d %r level=%d"
+            % (namex, nobj.name, fmlalen, bv, data, level), file=bk.logfile)
+        hex_char_dump(data, 0, fmlalen, fout=bk.logfile)
+    if level > STACK_PANIC_LEVEL:
+        raise XLRDError("Excessive indirect references in NAME formula")
+    sztab = szdict[bv]
+    pos = 0
+    stack = []
+    any_rel = 0
+    any_err = 0
+    any_external = 0
+    unk_opnd = Operand(oUNK, None)
+    error_opnd = Operand(oERR, None)
+    spush = stack.append
+
+    def do_binop(opcd, stk):
+        assert len(stk) >= 2
+        bop = stk.pop()
+        aop = stk.pop()
+        argdict, result_kind, func, rank, sym = binop_rules[opcd]
+        otext = ''.join([
+            '('[:aop.rank < rank],
+            aop.text,
+            ')'[:aop.rank < rank],
+            sym,
+            '('[:bop.rank < rank],
+            bop.text,
+            ')'[:bop.rank < rank],
+        ])
+        resop = Operand(result_kind, None, rank, otext)
+        try:
+            bconv = argdict[bop.kind]
+            aconv = argdict[aop.kind]
+        except KeyError:
+            stk.append(resop)
+            return
+        if bop.value is None or aop.value is None:
+            stk.append(resop)
+            return
+        bval = bconv(bop.value)
+        aval = aconv(aop.value)
+        result = func(aval, bval)
+        if result_kind == oBOOL:
+            result = 1 if result else 0
+        resop.value = result
+        stk.append(resop)
+
+    def do_unaryop(opcode, result_kind, stk):
+        assert len(stk) >= 1
+        aop = stk.pop()
+        val = aop.value
+        func, rank, sym1, sym2 = unop_rules[opcode]
+        otext = ''.join([
+            sym1,
+            '('[:aop.rank < rank],
+            aop.text,
+            ')'[:aop.rank < rank],
+            sym2,
+        ])
+        if val is not None:
+            val = func(val)
+        stk.append(Operand(result_kind, val, rank, otext))
+
+    def not_in_name_formula(op_arg, oname_arg):
+        msg = "ERROR *** Token 0x%02x (%s) found in NAME formula" \
+              % (op_arg, oname_arg)
+        raise FormulaError(msg)
+
+    if fmlalen == 0:
+        stack = [unk_opnd]
+
+    while 0 <= pos < fmlalen:
+        op = BYTES_ORD(data[pos])
+        opcode = op & 0x1f
+        optype = (op & 0x60) >> 5
+        if optype:
+            opx = opcode + 32
+        else:
+            opx = opcode
+        oname = onames[opx] # + [" RVA"][optype]
+        sz = sztab[opx]
+        if blah:
+            print("Pos:%d Op:0x%02x Name:t%s Sz:%d opcode:%02xh optype:%02xh"
+                % (pos, op, oname, sz, opcode, optype), file=bk.logfile)
+            print("Stack =", stack, file=bk.logfile)
+        if sz == -2:
+            msg = 'ERROR *** Unexpected token 0x%02x ("%s"); biff_version=%d' \
+                % (op, oname, bv)
+            raise FormulaError(msg)
+        if not optype:
+            if 0x00 <= opcode <= 0x02: # unk_opnd, tExp, tTbl
+                not_in_name_formula(op, oname)
+            elif 0x03 <= opcode <= 0x0E:
+                # Add, Sub, Mul, Div, Power
+                # tConcat
+                # tLT, ..., tNE
+                do_binop(opcode, stack)
+            elif opcode == 0x0F: # tIsect
+                if blah: print("tIsect pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                sym = ' '
+                rank = 80 ########## check #######
+                otext = ''.join([
+                    '('[:aop.rank < rank],
+                    aop.text,
+                    ')'[:aop.rank < rank],
+                    sym,
+                    '('[:bop.rank < rank],
+                    bop.text,
+                    ')'[:bop.rank < rank],
+                ])
+                res = Operand(oREF)
+                res.text = otext
+                if bop.kind == oERR or aop.kind == oERR:
+                    res.kind = oERR
+                elif bop.kind == oUNK or aop.kind == oUNK:
+                    # This can happen with undefined
+                    # (go search in the current sheet) labels.
+                    # For example =Bob Sales
+                    # Each label gets a NAME record with an empty formula (!)
+                    # Evaluation of the tName token classifies it as oUNK
+                    # res.kind = oREF
+                    pass
+                elif bop.kind == oREF == aop.kind:
+                    if aop.value is not None and bop.value is not None:
+                        assert len(aop.value) == 1
+                        assert len(bop.value) == 1
+                        coords = do_box_funcs(
+                            tIsectFuncs, aop.value[0], bop.value[0])
+                        res.value = [Ref3D(coords)]
+                elif bop.kind == oREL == aop.kind:
+                    res.kind = oREL
+                    if aop.value is not None and bop.value is not None:
+                        assert len(aop.value) == 1
+                        assert len(bop.value) == 1
+                        coords = do_box_funcs(
+                            tIsectFuncs, aop.value[0], bop.value[0])
+                        relfa = aop.value[0].relflags
+                        relfb = bop.value[0].relflags
+                        if relfa == relfb:
+                            res.value = [Ref3D(coords + relfa)]
+                else:
+                    pass
+                spush(res)
+                if blah: print("tIsect post", stack, file=bk.logfile)
+            elif opcode == 0x10: # tList
+                if blah: print("tList pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                sym = ','
+                rank = 80 ########## check #######
+                otext = ''.join([
+                    '('[:aop.rank < rank],
+                    aop.text,
+                    ')'[:aop.rank < rank],
+                    sym,
+                    '('[:bop.rank < rank],
+                    bop.text,
+                    ')'[:bop.rank < rank],
+                ])
+                res = Operand(oREF, None, rank, otext)
+                if bop.kind == oERR or aop.kind == oERR:
+                    res.kind = oERR
+                elif bop.kind in (oREF, oREL) and aop.kind in (oREF, oREL):
+                    res.kind = oREF
+                    if aop.kind == oREL or bop.kind == oREL:
+                        res.kind = oREL
+                    if aop.value is not None and bop.value is not None:
+                        assert len(aop.value) >= 1
+                        assert len(bop.value) == 1
+                        res.value = aop.value + bop.value
+                else:
+                    pass
+                spush(res)
+                if blah: print("tList post", stack, file=bk.logfile)
+            elif opcode == 0x11: # tRange
+                if blah: print("tRange pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                sym = ':'
+                rank = 80 ########## check #######
+                otext = ''.join([
+                    '('[:aop.rank < rank],
+                    aop.text,
+                    ')'[:aop.rank < rank],
+                    sym,
+                    '('[:bop.rank < rank],
+                    bop.text,
+                    ')'[:bop.rank < rank],
+                ])
+                res = Operand(oREF, None, rank, otext)
+                if bop.kind == oERR or aop.kind == oERR:
+                    res = oERR
+                elif bop.kind == oREF == aop.kind:
+                    if aop.value is not None and bop.value is not None:
+                        assert len(aop.value) == 1
+                        assert len(bop.value) == 1
+                        coords = do_box_funcs(
+                            tRangeFuncs, aop.value[0], bop.value[0])
+                        res.value = [Ref3D(coords)]
+                elif bop.kind == oREL == aop.kind:
+                    res.kind = oREL
+                    if aop.value is not None and bop.value is not None:
+                        assert len(aop.value) == 1
+                        assert len(bop.value) == 1
+                        coords = do_box_funcs(
+                            tRangeFuncs, aop.value[0], bop.value[0])
+                        relfa = aop.value[0].relflags
+                        relfb = bop.value[0].relflags
+                        if relfa == relfb:
+                            res.value = [Ref3D(coords + relfa)]
+                else:
+                    pass
+                spush(res)
+                if blah: print("tRange post", stack, file=bk.logfile)
+            elif 0x12 <= opcode <= 0x14: # tUplus, tUminus, tPercent
+                do_unaryop(opcode, oNUM, stack)
+            elif opcode == 0x15: # tParen
+                # source cosmetics
+                pass
+            elif opcode == 0x16: # tMissArg
+                spush(Operand(oMSNG, None, LEAF_RANK, ''))
+            elif opcode == 0x17: # tStr
+                if bv <= 70:
+                    strg, newpos = unpack_string_update_pos(
+                                        data, pos+1, bk.encoding, lenlen=1)
+                else:
+                    strg, newpos = unpack_unicode_update_pos(
+                                        data, pos+1, lenlen=1)
+                sz = newpos - pos
+                if blah: print("   sz=%d strg=%r" % (sz, strg), file=bk.logfile)
+                text = '"' + strg.replace('"', '""') + '"'
+                spush(Operand(oSTRG, strg, LEAF_RANK, text))
+            elif opcode == 0x18: # tExtended
+                # new with BIFF 8
+                assert bv >= 80
+                # not in OOo docs
+                raise FormulaError("tExtended token not implemented")
+            elif opcode == 0x19: # tAttr
+                subop, nc = unpack("<BH", data[pos+1:pos+4])
+                subname = tAttrNames.get(subop, "??Unknown??")
+                if subop == 0x04: # Choose
+                    sz = nc * 2 + 6
+                elif subop == 0x10: # Sum (single arg)
+                    sz = 4
+                    if blah: print("tAttrSum", stack, file=bk.logfile)
+                    assert len(stack) >= 1
+                    aop = stack[-1]
+                    otext = 'SUM(%s)' % aop.text
+                    stack[-1] = Operand(oNUM, None, FUNC_RANK, otext)
+                else:
+                    sz = 4
+                if blah:
+                    print("   subop=%02xh subname=t%s sz=%d nc=%02xh"
+                        % (subop, subname, sz, nc), file=bk.logfile)
+            elif 0x1A <= opcode <= 0x1B: # tSheet, tEndSheet
+                assert bv < 50
+                raise FormulaError("tSheet & tEndsheet tokens not implemented")
+            elif 0x1C <= opcode <= 0x1F: # tErr, tBool, tInt, tNum
+                inx = opcode - 0x1C
+                nb = [1, 1, 2, 8][inx]
+                kind = [oERR, oBOOL, oNUM, oNUM][inx]
+                value, = unpack("<" + "BBHd"[inx], data[pos+1:pos+1+nb])
+                if inx == 2: # tInt
+                    value = float(value)
+                    text = str(value)
+                elif inx == 3: # tNum
+                    text = str(value)
+                elif inx == 1: # tBool
+                    text = ('FALSE', 'TRUE')[value]
+                else:
+                    text = '"' +error_text_from_code[value] + '"'
+                spush(Operand(kind, value, LEAF_RANK, text))
+            else:
+                raise FormulaError("Unhandled opcode: 0x%02x" % opcode)
+            if sz <= 0:
+                raise FormulaError("Size not set for opcode 0x%02x" % opcode)
+            pos += sz
+            continue
+        if opcode == 0x00: # tArray
+            spush(unk_opnd)
+        elif opcode == 0x01: # tFunc
+            nb = 1 + int(bv >= 40)
+            funcx = unpack("<" + " BH"[nb], data[pos+1:pos+1+nb])[0]
+            func_attrs = func_defs.get(funcx, None)
+            if not func_attrs:
+                print("*** formula/tFunc unknown FuncID:%d"
+                      % funcx, file=bk.logfile)
+                spush(unk_opnd)
+            else:
+                func_name, nargs = func_attrs[:2]
+                if blah:
+                    print("    FuncID=%d name=%s nargs=%d"
+                          % (funcx, func_name, nargs), file=bk.logfile)
+                assert len(stack) >= nargs
+                if nargs:
+                    argtext = listsep.join(arg.text for arg in stack[-nargs:])
+                    otext = "%s(%s)" % (func_name, argtext)
+                    del stack[-nargs:]
+                else:
+                    otext = func_name + "()"
+                res = Operand(oUNK, None, FUNC_RANK, otext)
+                spush(res)
+        elif opcode == 0x02: #tFuncVar
+            nb = 1 + int(bv >= 40)
+            nargs, funcx = unpack("<B" + " BH"[nb], data[pos+1:pos+2+nb])
+            prompt, nargs = divmod(nargs, 128)
+            macro, funcx = divmod(funcx, 32768)
+            if blah:
+                print("   FuncID=%d nargs=%d macro=%d prompt=%d"
+                      % (funcx, nargs, macro, prompt), file=bk.logfile)
+            func_attrs = func_defs.get(funcx, None)
+            if not func_attrs:
+                print("*** formula/tFuncVar unknown FuncID:%d"
+                      % funcx, file=bk.logfile)
+                spush(unk_opnd)
+            else:
+                func_name, minargs, maxargs = func_attrs[:3]
+                if blah:
+                    print("    name: %r, min~max args: %d~%d"
+                        % (func_name, minargs, maxargs), file=bk.logfile)
+                assert minargs <= nargs <= maxargs
+                assert len(stack) >= nargs
+                assert len(stack) >= nargs
+                argtext = listsep.join(arg.text for arg in stack[-nargs:])
+                otext = "%s(%s)" % (func_name, argtext)
+                res = Operand(oUNK, None, FUNC_RANK, otext)
+                if funcx == 1: # IF
+                    testarg = stack[-nargs]
+                    if testarg.kind not in (oNUM, oBOOL):
+                        if blah and testarg.kind != oUNK:
+                            print("IF testarg kind?", file=bk.logfile)
+                    elif testarg.value not in (0, 1):
+                        if blah and testarg.value is not None:
+                            print("IF testarg value?", file=bk.logfile)
+                    else:
+                        if nargs == 2 and not testarg.value:
+                            # IF(FALSE, tv) => FALSE
+                            res.kind, res.value = oBOOL, 0
+                        else:
+                            respos = -nargs + 2 - int(testarg.value)
+                            chosen = stack[respos]
+                            if chosen.kind == oMSNG:
+                                res.kind, res.value = oNUM, 0
+                            else:
+                                res.kind, res.value = chosen.kind, chosen.value
+                        if blah:
+                            print("$$$$$$ IF => constant", file=bk.logfile)
+                elif funcx == 100: # CHOOSE
+                    testarg = stack[-nargs]
+                    if testarg.kind == oNUM:
+                        if 1 <= testarg.value < nargs:
+                            chosen = stack[-nargs + int(testarg.value)]
+                            if chosen.kind == oMSNG:
+                                res.kind, res.value = oNUM, 0
+                            else:
+                                res.kind, res.value = chosen.kind, chosen.value
+                del stack[-nargs:]
+                spush(res)
+        elif opcode == 0x03: #tName
+            tgtnamex = unpack("<H", data[pos+1:pos+3])[0] - 1
+            # Only change with BIFF version is number of trailing UNUSED bytes!
+            if blah: print("   tgtnamex=%d" % tgtnamex, file=bk.logfile)
+            tgtobj = bk.name_obj_list[tgtnamex]
+            if not tgtobj.evaluated:
+                ### recursive ###
+                evaluate_name_formula(bk, tgtobj, tgtnamex, blah, level+1)
+            if tgtobj.macro or tgtobj.binary or tgtobj.any_err:
+                if blah:
+                    tgtobj.dump(
+                        bk.logfile,
+                        header="!!! tgtobj has problems!!!",
+                        footer="-----------       --------",
+                    )
+                res = Operand(oUNK, None)
+                any_err = any_err or tgtobj.macro or tgtobj.binary or tgtobj.any_err
+                any_rel = any_rel or tgtobj.any_rel
+            else:
+                assert len(tgtobj.stack) == 1
+                res = copy.deepcopy(tgtobj.stack[0])
+            res.rank = LEAF_RANK
+            if tgtobj.scope == -1:
+                res.text = tgtobj.name
+            else:
+                res.text = "%s!%s" \
+                           % (bk._sheet_names[tgtobj.scope], tgtobj.name)
+            if blah:
+                print("    tName: setting text to", repr(res.text), file=bk.logfile)
+            spush(res)
+        elif opcode == 0x04: # tRef
+            # not_in_name_formula(op, oname)
+            res = get_cell_addr(data, pos+1, bv, reldelta)
+            if blah: print("  ", res, file=bk.logfile)
+            rowx, colx, row_rel, col_rel = res
+            shx1 = shx2 = 0 ####### N.B. relative to the CURRENT SHEET
+            any_rel = 1
+            coords = (shx1, shx2+1, rowx, rowx+1, colx, colx+1)
+            if blah: print("   ", coords, file=bk.logfile)
+            res = Operand(oUNK, None)
+            if optype == 1:
+                relflags = (1, 1, row_rel, row_rel, col_rel, col_rel)
+                res = Operand(oREL, [Ref3D(coords + relflags)])
+            spush(res)
+        elif opcode == 0x05: # tArea
+            # not_in_name_formula(op, oname)
+            res1, res2 = get_cell_range_addr(data, pos+1, bv, reldelta)
+            if blah: print("  ", res1, res2, file=bk.logfile)
+            rowx1, colx1, row_rel1, col_rel1 = res1
+            rowx2, colx2, row_rel2, col_rel2 = res2
+            shx1 = shx2 = 0 ####### N.B. relative to the CURRENT SHEET
+            any_rel = 1
+            coords = (shx1, shx2+1, rowx1, rowx2+1, colx1, colx2+1)
+            if blah: print("   ", coords, file=bk.logfile)
+            res = Operand(oUNK, None)
+            if optype == 1:
+                relflags = (1, 1, row_rel1, row_rel2, col_rel1, col_rel2)
+                res = Operand(oREL, [Ref3D(coords + relflags)])
+            spush(res)
+        elif opcode == 0x06: # tMemArea
+            not_in_name_formula(op, oname)
+        elif opcode == 0x09: # tMemFunc
+            nb = unpack("<H", data[pos+1:pos+3])[0]
+            if blah: print("  %d bytes of cell ref formula" % nb, file=bk.logfile)
+            # no effect on stack
+        elif opcode == 0x0C: #tRefN
+            not_in_name_formula(op, oname)
+            # res = get_cell_addr(data, pos+1, bv, reldelta=1)
+            # # note *ALL* tRefN usage has signed offset for relative addresses
+            # any_rel = 1
+            # if blah: print >> bk.logfile, "   ", res
+            # spush(res)
+        elif opcode == 0x0D: #tAreaN
+            not_in_name_formula(op, oname)
+            # res = get_cell_range_addr(data, pos+1, bv, reldelta=1)
+            # # note *ALL* tAreaN usage has signed offset for relative addresses
+            # any_rel = 1
+            # if blah: print >> bk.logfile, "   ", res
+        elif opcode == 0x1A: # tRef3d
+            if bv >= 80:
+                res = get_cell_addr(data, pos+3, bv, reldelta)
+                refx = unpack("<H", data[pos+1:pos+3])[0]
+                shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+            else:
+                res = get_cell_addr(data, pos+15, bv, reldelta)
+                raw_extshtx, raw_shx1, raw_shx2 = unpack("<hxxxxxxxxhh", data[pos+1:pos+15])
+                if blah:
+                    print("tRef3d", raw_extshtx, raw_shx1, raw_shx2, file=bk.logfile)
+                shx1, shx2 = get_externsheet_local_range_b57(
+                                bk, raw_extshtx, raw_shx1, raw_shx2, blah)
+            rowx, colx, row_rel, col_rel = res
+            is_rel = row_rel or col_rel
+            any_rel = any_rel or is_rel
+            coords = (shx1, shx2+1, rowx, rowx+1, colx, colx+1)
+            any_err |= shx1 < -1
+            if blah: print("   ", coords, file=bk.logfile)
+            res = Operand(oUNK, None)
+            if is_rel:
+                relflags = (0, 0, row_rel, row_rel, col_rel, col_rel)
+                ref3d = Ref3D(coords + relflags)
+                res.kind = oREL
+                res.text = rangename3drel(bk, ref3d, r1c1=1)
+            else:
+                ref3d = Ref3D(coords)
+                res.kind = oREF
+                res.text = rangename3d(bk, ref3d)
+            res.rank = LEAF_RANK
+            if optype == 1:
+                res.value = [ref3d]
+            spush(res)
+        elif opcode == 0x1B: # tArea3d
+            if bv >= 80:
+                res1, res2 = get_cell_range_addr(data, pos+3, bv, reldelta)
+                refx = unpack("<H", data[pos+1:pos+3])[0]
+                shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+            else:
+                res1, res2 = get_cell_range_addr(data, pos+15, bv, reldelta)
+                raw_extshtx, raw_shx1, raw_shx2 = unpack("<hxxxxxxxxhh", data[pos+1:pos+15])
+                if blah:
+                    print("tArea3d", raw_extshtx, raw_shx1, raw_shx2, file=bk.logfile)
+                shx1, shx2 = get_externsheet_local_range_b57(
+                                bk, raw_extshtx, raw_shx1, raw_shx2, blah)
+            any_err |= shx1 < -1
+            rowx1, colx1, row_rel1, col_rel1 = res1
+            rowx2, colx2, row_rel2, col_rel2 = res2
+            is_rel = row_rel1 or col_rel1 or row_rel2 or col_rel2
+            any_rel = any_rel or is_rel
+            coords = (shx1, shx2+1, rowx1, rowx2+1, colx1, colx2+1)
+            if blah: print("   ", coords, file=bk.logfile)
+            res = Operand(oUNK, None)
+            if is_rel:
+                relflags = (0, 0, row_rel1, row_rel2, col_rel1, col_rel2)
+                ref3d = Ref3D(coords + relflags)
+                res.kind = oREL
+                res.text = rangename3drel(bk, ref3d, r1c1=1)
+            else:
+                ref3d = Ref3D(coords)
+                res.kind = oREF
+                res.text = rangename3d(bk, ref3d)
+            res.rank = LEAF_RANK
+            if optype == 1:
+                res.value = [ref3d]
+
+            spush(res)
+        elif opcode == 0x19: # tNameX
+            dodgy = 0
+            res = Operand(oUNK, None)
+            if bv >= 80:
+                refx, tgtnamex = unpack("<HH", data[pos+1:pos+5])
+                tgtnamex -= 1
+                origrefx = refx
+            else:
+                refx, tgtnamex = unpack("<hxxxxxxxxH", data[pos+1:pos+13])
+                tgtnamex -= 1
+                origrefx = refx
+                if refx > 0:
+                    refx -= 1
+                elif refx < 0:
+                    refx = -refx - 1
+                else:
+                    dodgy = 1
+            if blah:
+                print("   origrefx=%d refx=%d tgtnamex=%d dodgy=%d"
+                    % (origrefx, refx, tgtnamex, dodgy), file=bk.logfile)
+            if tgtnamex == namex:
+                if blah: print("!!!! Self-referential !!!!", file=bk.logfile)
+                dodgy = any_err = 1
+            if not dodgy:
+                if bv >= 80:
+                    shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+                elif origrefx > 0:
+                    shx1, shx2 = (-4, -4) # external ref
+                else:
+                    exty = bk._externsheet_type_b57[refx]
+                    if exty == 4: # non-specific sheet in own doc't
+                        shx1, shx2 = (-1, -1) # internal, any sheet
+                    else:
+                        shx1, shx2 = (-666, -666)
+            if dodgy or shx1 < -1:
+                otext = "<<Name #%d in external(?) file #%d>>" \
+                        % (tgtnamex, origrefx)
+                res = Operand(oUNK, None, LEAF_RANK, otext)
+            else:
+                tgtobj = bk.name_obj_list[tgtnamex]
+                if not tgtobj.evaluated:
+                    ### recursive ###
+                    evaluate_name_formula(bk, tgtobj, tgtnamex, blah, level+1)
+                if tgtobj.macro or tgtobj.binary or tgtobj.any_err:
+                    if blah:
+                        tgtobj.dump(
+                            bk.logfile,
+                            header="!!! bad tgtobj !!!",
+                            footer="------------------",
+                        )
+                    res = Operand(oUNK, None)
+                    any_err = any_err or tgtobj.macro or tgtobj.binary or tgtobj.any_err
+                    any_rel = any_rel or tgtobj.any_rel
+                else:
+                    assert len(tgtobj.stack) == 1
+                    res = copy.deepcopy(tgtobj.stack[0])
+                res.rank = LEAF_RANK
+                if tgtobj.scope == -1:
+                    res.text = tgtobj.name
+                else:
+                    res.text = "%s!%s" \
+                               % (bk._sheet_names[tgtobj.scope], tgtobj.name)
+                if blah:
+                    print("    tNameX: setting text to", repr(res.text), file=bk.logfile)
+            spush(res)
+        elif opcode in error_opcodes:
+            any_err = 1
+            spush(error_opnd)
+        else:
+            if blah:
+                print("FORMULA: /// Not handled yet: t" + oname, file=bk.logfile)
+            any_err = 1
+        if sz <= 0:
+            raise FormulaError("Fatal: token size is not positive")
+        pos += sz
+    any_rel = not not any_rel
+    if blah:
+        fprintf(bk.logfile, "End of formula. level=%d any_rel=%d any_err=%d stack=%r\n",
+            level, not not any_rel, any_err, stack)
+        if len(stack) >= 2:
+            print("*** Stack has unprocessed args", file=bk.logfile)
+        print(file=bk.logfile)
+    nobj.stack = stack
+    if len(stack) != 1:
+        nobj.result = None
+    else:
+        nobj.result = stack[0]
+    nobj.any_rel = any_rel
+    nobj.any_err = any_err
+    nobj.any_external = any_external
+    nobj.evaluated = 1
+
+#### under construction #############################################################################
+def decompile_formula(bk, fmla, fmlalen,
+                      fmlatype=None, browx=None, bcolx=None,
+                      blah=0, level=0, r1c1=0):
+    if level > STACK_ALARM_LEVEL:
+        blah = 1
+    reldelta = fmlatype in (FMLA_TYPE_SHARED, FMLA_TYPE_NAME, FMLA_TYPE_COND_FMT, FMLA_TYPE_DATA_VAL)
+    data = fmla
+    bv = bk.biff_version
+    if blah:
+        print("::: decompile_formula len=%d fmlatype=%r browx=%r bcolx=%r reldelta=%d %r level=%d"
+            % (fmlalen, fmlatype, browx, bcolx, reldelta, data, level), file=bk.logfile)
+        hex_char_dump(data, 0, fmlalen, fout=bk.logfile)
+    if level > STACK_PANIC_LEVEL:
+        raise XLRDError("Excessive indirect references in formula")
+    sztab = szdict[bv]
+    pos = 0
+    stack = []
+    any_rel = 0
+    any_err = 0
+    unk_opnd = Operand(oUNK, None)
+    error_opnd = Operand(oERR, None)
+    spush = stack.append
+
+    def do_binop(opcd, stk):
+        assert len(stk) >= 2
+        bop = stk.pop()
+        aop = stk.pop()
+        argdict, result_kind, func, rank, sym = binop_rules[opcd]
+        otext = ''.join([
+            '('[:aop.rank < rank],
+            aop.text,
+            ')'[:aop.rank < rank],
+            sym,
+            '('[:bop.rank < rank],
+            bop.text,
+            ')'[:bop.rank < rank],
+        ])
+        resop = Operand(result_kind, None, rank, otext)
+        stk.append(resop)
+
+    def do_unaryop(opcode, result_kind, stk):
+        assert len(stk) >= 1
+        aop = stk.pop()
+        func, rank, sym1, sym2 = unop_rules[opcode]
+        otext = ''.join([
+            sym1,
+            '('[:aop.rank < rank],
+            aop.text,
+            ')'[:aop.rank < rank],
+            sym2,
+        ])
+        stk.append(Operand(result_kind, None, rank, otext))
+
+    def unexpected_opcode(op_arg, oname_arg):
+        msg = "ERROR *** Unexpected token 0x%02x (%s) found in formula type %s" \
+              % (op_arg, oname_arg, FMLA_TYPEDESCR_MAP[fmlatype])
+        print(msg, file=bk.logfile)
+        # raise FormulaError(msg)
+
+    if fmlalen == 0:
+        stack = [unk_opnd]
+
+    while 0 <= pos < fmlalen:
+        op = BYTES_ORD(data[pos])
+        opcode = op & 0x1f
+        optype = (op & 0x60) >> 5
+        if optype:
+            opx = opcode + 32
+        else:
+            opx = opcode
+        oname = onames[opx] # + [" RVA"][optype]
+        sz = sztab[opx]
+        if blah:
+            print("Pos:%d Op:0x%02x opname:t%s Sz:%d opcode:%02xh optype:%02xh"
+                % (pos, op, oname, sz, opcode, optype), file=bk.logfile)
+            print("Stack =", stack, file=bk.logfile)
+        if sz == -2:
+            msg = 'ERROR *** Unexpected token 0x%02x ("%s"); biff_version=%d' \
+                % (op, oname, bv)
+            raise FormulaError(msg)
+        if _TOKEN_NOT_ALLOWED(opx, 0) & fmlatype:
+            unexpected_opcode(op, oname)
+        if not optype:
+            if opcode <= 0x01: # tExp
+                if bv >= 30:
+                    fmt = '<x2H'
+                else:
+                    fmt = '<xHB'
+                assert pos == 0 and fmlalen == sz and not stack
+                rowx, colx = unpack(fmt, data)
+                text = "SHARED FMLA at rowx=%d colx=%d" % (rowx, colx)
+                spush(Operand(oUNK, None, LEAF_RANK, text))
+                if not fmlatype & (FMLA_TYPE_CELL | FMLA_TYPE_ARRAY):
+                    unexpected_opcode(op, oname)
+            elif 0x03 <= opcode <= 0x0E:
+                # Add, Sub, Mul, Div, Power
+                # tConcat
+                # tLT, ..., tNE
+                do_binop(opcode, stack)
+            elif opcode == 0x0F: # tIsect
+                if blah: print("tIsect pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                sym = ' '
+                rank = 80 ########## check #######
+                otext = ''.join([
+                    '('[:aop.rank < rank],
+                    aop.text,
+                    ')'[:aop.rank < rank],
+                    sym,
+                    '('[:bop.rank < rank],
+                    bop.text,
+                    ')'[:bop.rank < rank],
+                ])
+                res = Operand(oREF)
+                res.text = otext
+                if bop.kind == oERR or aop.kind == oERR:
+                    res.kind = oERR
+                elif bop.kind == oUNK or aop.kind == oUNK:
+                    # This can happen with undefined
+                    # (go search in the current sheet) labels.
+                    # For example =Bob Sales
+                    # Each label gets a NAME record with an empty formula (!)
+                    # Evaluation of the tName token classifies it as oUNK
+                    # res.kind = oREF
+                    pass
+                elif bop.kind == oREF == aop.kind:
+                    pass
+                elif bop.kind == oREL == aop.kind:
+                    res.kind = oREL
+                else:
+                    pass
+                spush(res)
+                if blah: print("tIsect post", stack, file=bk.logfile)
+            elif opcode == 0x10: # tList
+                if blah: print("tList pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                sym = ','
+                rank = 80 ########## check #######
+                otext = ''.join([
+                    '('[:aop.rank < rank],
+                    aop.text,
+                    ')'[:aop.rank < rank],
+                    sym,
+                    '('[:bop.rank < rank],
+                    bop.text,
+                    ')'[:bop.rank < rank],
+                ])
+                res = Operand(oREF, None, rank, otext)
+                if bop.kind == oERR or aop.kind == oERR:
+                    res.kind = oERR
+                elif bop.kind in (oREF, oREL) and aop.kind in (oREF, oREL):
+                    res.kind = oREF
+                    if aop.kind == oREL or bop.kind == oREL:
+                        res.kind = oREL
+                else:
+                    pass
+                spush(res)
+                if blah: print("tList post", stack, file=bk.logfile)
+            elif opcode == 0x11: # tRange
+                if blah: print("tRange pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                sym = ':'
+                rank = 80 ########## check #######
+                otext = ''.join([
+                    '('[:aop.rank < rank],
+                    aop.text,
+                    ')'[:aop.rank < rank],
+                    sym,
+                    '('[:bop.rank < rank],
+                    bop.text,
+                    ')'[:bop.rank < rank],
+                ])
+                res = Operand(oREF, None, rank, otext)
+                if bop.kind == oERR or aop.kind == oERR:
+                    res = oERR
+                elif bop.kind == oREF == aop.kind:
+                    pass
+                else:
+                    pass
+                spush(res)
+                if blah: print("tRange post", stack, file=bk.logfile)
+            elif 0x12 <= opcode <= 0x14: # tUplus, tUminus, tPercent
+                do_unaryop(opcode, oNUM, stack)
+            elif opcode == 0x15: # tParen
+                # source cosmetics
+                pass
+            elif opcode == 0x16: # tMissArg
+                spush(Operand(oMSNG, None, LEAF_RANK, ''))
+            elif opcode == 0x17: # tStr
+                if bv <= 70:
+                    strg, newpos = unpack_string_update_pos(
+                                        data, pos+1, bk.encoding, lenlen=1)
+                else:
+                    strg, newpos = unpack_unicode_update_pos(
+                                        data, pos+1, lenlen=1)
+                sz = newpos - pos
+                if blah: print("   sz=%d strg=%r" % (sz, strg), file=bk.logfile)
+                text = '"' + strg.replace('"', '""') + '"'
+                spush(Operand(oSTRG, None, LEAF_RANK, text))
+            elif opcode == 0x18: # tExtended
+                # new with BIFF 8
+                assert bv >= 80
+                # not in OOo docs, don't even know how to determine its length
+                raise FormulaError("tExtended token not implemented")
+            elif opcode == 0x19: # tAttr
+                subop, nc = unpack("<BH", data[pos+1:pos+4])
+                subname = tAttrNames.get(subop, "??Unknown??")
+                if subop == 0x04: # Choose
+                    sz = nc * 2 + 6
+                elif subop == 0x10: # Sum (single arg)
+                    sz = 4
+                    if blah: print("tAttrSum", stack, file=bk.logfile)
+                    assert len(stack) >= 1
+                    aop = stack[-1]
+                    otext = 'SUM(%s)' % aop.text
+                    stack[-1] = Operand(oNUM, None, FUNC_RANK, otext)
+                else:
+                    sz = 4
+                if blah:
+                    print("   subop=%02xh subname=t%s sz=%d nc=%02xh"
+                        % (subop, subname, sz, nc), file=bk.logfile)
+            elif 0x1A <= opcode <= 0x1B: # tSheet, tEndSheet
+                assert bv < 50
+                raise FormulaError("tSheet & tEndsheet tokens not implemented")
+            elif 0x1C <= opcode <= 0x1F: # tErr, tBool, tInt, tNum
+                inx = opcode - 0x1C
+                nb = [1, 1, 2, 8][inx]
+                kind = [oERR, oBOOL, oNUM, oNUM][inx]
+                value, = unpack("<" + "BBHd"[inx], data[pos+1:pos+1+nb])
+                if inx == 2: # tInt
+                    value = float(value)
+                    text = str(value)
+                elif inx == 3: # tNum
+                    text = str(value)
+                elif inx == 1: # tBool
+                    text = ('FALSE', 'TRUE')[value]
+                else:
+                    text = '"' +error_text_from_code[value] + '"'
+                spush(Operand(kind, None, LEAF_RANK, text))
+            else:
+                raise FormulaError("Unhandled opcode: 0x%02x" % opcode)
+            if sz <= 0:
+                raise FormulaError("Size not set for opcode 0x%02x" % opcode)
+            pos += sz
+            continue
+        if opcode == 0x00: # tArray
+            spush(unk_opnd)
+        elif opcode == 0x01: # tFunc
+            nb = 1 + int(bv >= 40)
+            funcx = unpack("<" + " BH"[nb], data[pos+1:pos+1+nb])[0]
+            func_attrs = func_defs.get(funcx, None)
+            if not func_attrs:
+                print("*** formula/tFunc unknown FuncID:%d" % funcx, file=bk.logfile)
+                spush(unk_opnd)
+            else:
+                func_name, nargs = func_attrs[:2]
+                if blah:
+                    print("    FuncID=%d name=%s nargs=%d"
+                          % (funcx, func_name, nargs), file=bk.logfile)
+                assert len(stack) >= nargs
+                if nargs:
+                    argtext = listsep.join(arg.text for arg in stack[-nargs:])
+                    otext = "%s(%s)" % (func_name, argtext)
+                    del stack[-nargs:]
+                else:
+                    otext = func_name + "()"
+                res = Operand(oUNK, None, FUNC_RANK, otext)
+                spush(res)
+        elif opcode == 0x02: #tFuncVar
+            nb = 1 + int(bv >= 40)
+            nargs, funcx = unpack("<B" + " BH"[nb], data[pos+1:pos+2+nb])
+            prompt, nargs = divmod(nargs, 128)
+            macro, funcx = divmod(funcx, 32768)
+            if blah:
+                print("   FuncID=%d nargs=%d macro=%d prompt=%d"
+                      % (funcx, nargs, macro, prompt), file=bk.logfile)
+            #### TODO #### if funcx == 255: # call add-in function
+            if funcx == 255:
+                func_attrs = ("CALL_ADDIN", 1, 30)
+            else:
+                func_attrs = func_defs.get(funcx, None)
+            if not func_attrs:
+                print("*** formula/tFuncVar unknown FuncID:%d"
+                      % funcx, file=bk.logfile)
+                spush(unk_opnd)
+            else:
+                func_name, minargs, maxargs = func_attrs[:3]
+                if blah:
+                    print("    name: %r, min~max args: %d~%d"
+                        % (func_name, minargs, maxargs), file=bk.logfile)
+                assert minargs <= nargs <= maxargs
+                assert len(stack) >= nargs
+                assert len(stack) >= nargs
+                argtext = listsep.join(arg.text for arg in stack[-nargs:])
+                otext = "%s(%s)" % (func_name, argtext)
+                res = Operand(oUNK, None, FUNC_RANK, otext)
+                del stack[-nargs:]
+                spush(res)
+        elif opcode == 0x03: #tName
+            tgtnamex = unpack("<H", data[pos+1:pos+3])[0] - 1
+            # Only change with BIFF version is number of trailing UNUSED bytes!
+            if blah: print("   tgtnamex=%d" % tgtnamex, file=bk.logfile)
+            tgtobj = bk.name_obj_list[tgtnamex]
+            if tgtobj.scope == -1:
+                otext = tgtobj.name
+            else:
+                otext = "%s!%s" % (bk._sheet_names[tgtobj.scope], tgtobj.name)
+            if blah:
+                print("    tName: setting text to", repr(otext), file=bk.logfile)
+            res = Operand(oUNK, None, LEAF_RANK, otext)
+            spush(res)
+        elif opcode == 0x04: # tRef
+            res = get_cell_addr(data, pos+1, bv, reldelta, browx, bcolx)
+            if blah: print("  ", res, file=bk.logfile)
+            rowx, colx, row_rel, col_rel = res
+            is_rel = row_rel or col_rel
+            if is_rel:
+                okind = oREL
+            else:
+                okind = oREF
+            otext = cellnamerel(rowx, colx, row_rel, col_rel, browx, bcolx, r1c1)
+            res = Operand(okind, None, LEAF_RANK, otext)
+            spush(res)
+        elif opcode == 0x05: # tArea
+            res1, res2 = get_cell_range_addr(
+                            data, pos+1, bv, reldelta, browx, bcolx)
+            if blah: print("  ", res1, res2, file=bk.logfile)
+            rowx1, colx1, row_rel1, col_rel1 = res1
+            rowx2, colx2, row_rel2, col_rel2 = res2
+            coords = (rowx1, rowx2+1, colx1, colx2+1)
+            relflags = (row_rel1, row_rel2, col_rel1, col_rel2)
+            if sum(relflags):  # relative
+                okind = oREL
+            else:
+                okind = oREF
+            if blah: print("   ", coords, relflags, file=bk.logfile)
+            otext = rangename2drel(coords, relflags, browx, bcolx, r1c1)
+            res = Operand(okind, None, LEAF_RANK, otext)
+            spush(res)
+        elif opcode == 0x06: # tMemArea
+            not_in_name_formula(op, oname)
+        elif opcode == 0x09: # tMemFunc
+            nb = unpack("<H", data[pos+1:pos+3])[0]
+            if blah: print("  %d bytes of cell ref formula" % nb, file=bk.logfile)
+            # no effect on stack
+        elif opcode == 0x0C: #tRefN
+            res = get_cell_addr(data, pos+1, bv, reldelta, browx, bcolx)
+            # note *ALL* tRefN usage has signed offset for relative addresses
+            any_rel = 1
+            if blah: print("   ", res, file=bk.logfile)
+            rowx, colx, row_rel, col_rel = res
+            is_rel = row_rel or col_rel
+            if is_rel:
+                okind = oREL
+            else:
+                okind = oREF
+            otext = cellnamerel(rowx, colx, row_rel, col_rel, browx, bcolx, r1c1)
+            res = Operand(okind, None, LEAF_RANK, otext)
+            spush(res)
+        elif opcode == 0x0D: #tAreaN
+            # res = get_cell_range_addr(data, pos+1, bv, reldelta, browx, bcolx)
+            # # note *ALL* tAreaN usage has signed offset for relative addresses
+            # any_rel = 1
+            # if blah: print >> bk.logfile, "   ", res
+            res1, res2 = get_cell_range_addr(
+                            data, pos+1, bv, reldelta, browx, bcolx)
+            if blah: print("  ", res1, res2, file=bk.logfile)
+            rowx1, colx1, row_rel1, col_rel1 = res1
+            rowx2, colx2, row_rel2, col_rel2 = res2
+            coords = (rowx1, rowx2+1, colx1, colx2+1)
+            relflags = (row_rel1, row_rel2, col_rel1, col_rel2)
+            if sum(relflags):  # relative
+                okind = oREL
+            else:
+                okind = oREF
+            if blah: print("   ", coords, relflags, file=bk.logfile)
+            otext = rangename2drel(coords, relflags, browx, bcolx, r1c1)
+            res = Operand(okind, None, LEAF_RANK, otext)
+            spush(res)
+        elif opcode == 0x1A: # tRef3d
+            if bv >= 80:
+                res = get_cell_addr(data, pos+3, bv, reldelta, browx, bcolx)
+                refx = unpack("<H", data[pos+1:pos+3])[0]
+                shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+            else:
+                res = get_cell_addr(data, pos+15, bv, reldelta, browx, bcolx)
+                raw_extshtx, raw_shx1, raw_shx2 = unpack("<hxxxxxxxxhh", data[pos+1:pos+15])
+                if blah:
+                    print("tRef3d", raw_extshtx, raw_shx1, raw_shx2, file=bk.logfile)
+                shx1, shx2 = get_externsheet_local_range_b57(
+                                bk, raw_extshtx, raw_shx1, raw_shx2, blah)
+            rowx, colx, row_rel, col_rel = res
+            is_rel = row_rel or col_rel
+            any_rel = any_rel or is_rel
+            coords = (shx1, shx2+1, rowx, rowx+1, colx, colx+1)
+            any_err |= shx1 < -1
+            if blah: print("   ", coords, file=bk.logfile)
+            res = Operand(oUNK, None)
+            if is_rel:
+                relflags = (0, 0, row_rel, row_rel, col_rel, col_rel)
+                ref3d = Ref3D(coords + relflags)
+                res.kind = oREL
+                res.text = rangename3drel(bk, ref3d, browx, bcolx, r1c1)
+            else:
+                ref3d = Ref3D(coords)
+                res.kind = oREF
+                res.text = rangename3d(bk, ref3d)
+            res.rank = LEAF_RANK
+            res.value = None
+            spush(res)
+        elif opcode == 0x1B: # tArea3d
+            if bv >= 80:
+                res1, res2 = get_cell_range_addr(data, pos+3, bv, reldelta)
+                refx = unpack("<H", data[pos+1:pos+3])[0]
+                shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+            else:
+                res1, res2 = get_cell_range_addr(data, pos+15, bv, reldelta)
+                raw_extshtx, raw_shx1, raw_shx2 = unpack("<hxxxxxxxxhh", data[pos+1:pos+15])
+                if blah:
+                    print("tArea3d", raw_extshtx, raw_shx1, raw_shx2, file=bk.logfile)
+                shx1, shx2 = get_externsheet_local_range_b57(
+                                bk, raw_extshtx, raw_shx1, raw_shx2, blah)
+            any_err |= shx1 < -1
+            rowx1, colx1, row_rel1, col_rel1 = res1
+            rowx2, colx2, row_rel2, col_rel2 = res2
+            is_rel = row_rel1 or col_rel1 or row_rel2 or col_rel2
+            any_rel = any_rel or is_rel
+            coords = (shx1, shx2+1, rowx1, rowx2+1, colx1, colx2+1)
+            if blah: print("   ", coords, file=bk.logfile)
+            res = Operand(oUNK, None)
+            if is_rel:
+                relflags = (0, 0, row_rel1, row_rel2, col_rel1, col_rel2)
+                ref3d = Ref3D(coords + relflags)
+                res.kind = oREL
+                res.text = rangename3drel(bk, ref3d, browx, bcolx, r1c1)
+            else:
+                ref3d = Ref3D(coords)
+                res.kind = oREF
+                res.text = rangename3d(bk, ref3d)
+            res.rank = LEAF_RANK
+            spush(res)
+        elif opcode == 0x19: # tNameX
+            dodgy = 0
+            res = Operand(oUNK, None)
+            if bv >= 80:
+                refx, tgtnamex = unpack("<HH", data[pos+1:pos+5])
+                tgtnamex -= 1
+                origrefx = refx
+            else:
+                refx, tgtnamex = unpack("<hxxxxxxxxH", data[pos+1:pos+13])
+                tgtnamex -= 1
+                origrefx = refx
+                if refx > 0:
+                    refx -= 1
+                elif refx < 0:
+                    refx = -refx - 1
+                else:
+                    dodgy = 1
+            if blah:
+                print("   origrefx=%d refx=%d tgtnamex=%d dodgy=%d"
+                    % (origrefx, refx, tgtnamex, dodgy), file=bk.logfile)
+            # if tgtnamex == namex:
+            #     if blah: print >> bk.logfile, "!!!! Self-referential !!!!"
+            #     dodgy = any_err = 1
+            if not dodgy:
+                if bv >= 80:
+                    shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+                elif origrefx > 0:
+                    shx1, shx2 = (-4, -4) # external ref
+                else:
+                    exty = bk._externsheet_type_b57[refx]
+                    if exty == 4: # non-specific sheet in own doc't
+                        shx1, shx2 = (-1, -1) # internal, any sheet
+                    else:
+                        shx1, shx2 = (-666, -666)
+            okind = oUNK
+            ovalue = None
+            if shx1 == -5: # addin func name
+                okind = oSTRG
+                ovalue = bk.addin_func_names[tgtnamex]
+                otext = '"' + ovalue.replace('"', '""') + '"'
+            elif dodgy or shx1 < -1:
+                otext = "<<Name #%d in external(?) file #%d>>" \
+                        % (tgtnamex, origrefx)
+            else:
+                tgtobj = bk.name_obj_list[tgtnamex]
+                if tgtobj.scope == -1:
+                    otext = tgtobj.name
+                else:
+                    otext = "%s!%s" \
+                            % (bk._sheet_names[tgtobj.scope], tgtobj.name)
+                if blah:
+                    print("    tNameX: setting text to", repr(res.text), file=bk.logfile)
+            res = Operand(okind, ovalue, LEAF_RANK, otext)
+            spush(res)
+        elif opcode in error_opcodes:
+            any_err = 1
+            spush(error_opnd)
+        else:
+            if blah:
+                print("FORMULA: /// Not handled yet: t" + oname, file=bk.logfile)
+            any_err = 1
+        if sz <= 0:
+            raise FormulaError("Fatal: token size is not positive")
+        pos += sz
+    any_rel = not not any_rel
+    if blah:
+        print("End of formula. level=%d any_rel=%d any_err=%d stack=%r" %
+            (level, not not any_rel, any_err, stack), file=bk.logfile)
+        if len(stack) >= 2:
+            print("*** Stack has unprocessed args", file=bk.logfile)
+        print(file=bk.logfile)
+
+    if len(stack) != 1:
+        result = None
+    else:
+        result = stack[0].text
+    return result
+
+#### under deconstruction ###
+def dump_formula(bk, data, fmlalen, bv, reldelta, blah=0, isname=0):
+    if blah:
+        print("dump_formula", fmlalen, bv, len(data), file=bk.logfile)
+        hex_char_dump(data, 0, fmlalen, fout=bk.logfile)
+    assert bv >= 80 #### this function needs updating ####
+    sztab = szdict[bv]
+    pos = 0
+    stack = []
+    any_rel = 0
+    any_err = 0
+    spush = stack.append
+    while 0 <= pos < fmlalen:
+        op = BYTES_ORD(data[pos])
+        opcode = op & 0x1f
+        optype = (op & 0x60) >> 5
+        if optype:
+            opx = opcode + 32
+        else:
+            opx = opcode
+        oname = onames[opx] # + [" RVA"][optype]
+
+        sz = sztab[opx]
+        if blah:
+            print("Pos:%d Op:0x%02x Name:t%s Sz:%d opcode:%02xh optype:%02xh"
+                % (pos, op, oname, sz, opcode, optype), file=bk.logfile)
+        if not optype:
+            if 0x01 <= opcode <= 0x02: # tExp, tTbl
+                # reference to a shared formula or table record
+                rowx, colx = unpack("<HH", data[pos+1:pos+5])
+                if blah: print("  ", (rowx, colx), file=bk.logfile)
+            elif opcode == 0x10: # tList
+                if blah: print("tList pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                spush(aop + bop)
+                if blah: print("tlist post", stack, file=bk.logfile)
+            elif opcode == 0x11: # tRange
+                if blah: print("tRange pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                assert len(aop) == 1
+                assert len(bop) == 1
+                result = do_box_funcs(tRangeFuncs, aop[0], bop[0])
+                spush(result)
+                if blah: print("tRange post", stack, file=bk.logfile)
+            elif opcode == 0x0F: # tIsect
+                if blah: print("tIsect pre", stack, file=bk.logfile)
+                assert len(stack) >= 2
+                bop = stack.pop()
+                aop = stack.pop()
+                assert len(aop) == 1
+                assert len(bop) == 1
+                result = do_box_funcs(tIsectFuncs, aop[0], bop[0])
+                spush(result)
+                if blah: print("tIsect post", stack, file=bk.logfile)
+            elif opcode == 0x19: # tAttr
+                subop, nc = unpack("<BH", data[pos+1:pos+4])
+                subname = tAttrNames.get(subop, "??Unknown??")
+                if subop == 0x04: # Choose
+                    sz = nc * 2 + 6
+                else:
+                    sz = 4
+                if blah: print("   subop=%02xh subname=t%s sz=%d nc=%02xh" % (subop, subname, sz, nc), file=bk.logfile)
+            elif opcode == 0x17: # tStr
+                if bv <= 70:
+                    nc = BYTES_ORD(data[pos+1])
+                    strg = data[pos+2:pos+2+nc] # left in 8-bit encoding
+                    sz = nc + 2
+                else:
+                    strg, newpos = unpack_unicode_update_pos(data, pos+1, lenlen=1)
+                    sz = newpos - pos
+                if blah: print("   sz=%d strg=%r" % (sz, strg), file=bk.logfile)
+            else:
+                if sz <= 0:
+                    print("**** Dud size; exiting ****", file=bk.logfile)
+                    return
+            pos += sz
+            continue
+        if opcode == 0x00: # tArray
+            pass
+        elif opcode == 0x01: # tFunc
+            nb = 1 + int(bv >= 40)
+            funcx = unpack("<" + " BH"[nb], data[pos+1:pos+1+nb])
+            if blah: print("   FuncID=%d" % funcx, file=bk.logfile)
+        elif opcode == 0x02: #tFuncVar
+            nb = 1 + int(bv >= 40)
+            nargs, funcx = unpack("<B" + " BH"[nb], data[pos+1:pos+2+nb])
+            prompt, nargs = divmod(nargs, 128)
+            macro, funcx = divmod(funcx, 32768)
+            if blah: print("   FuncID=%d nargs=%d macro=%d prompt=%d" % (funcx, nargs, macro, prompt), file=bk.logfile)
+        elif opcode == 0x03: #tName
+            namex = unpack("<H", data[pos+1:pos+3])
+            # Only change with BIFF version is the number of trailing UNUSED bytes!!!
+            if blah: print("   namex=%d" % namex, file=bk.logfile)
+        elif opcode == 0x04: # tRef
+            res = get_cell_addr(data, pos+1, bv, reldelta)
+            if blah: print("  ", res, file=bk.logfile)
+        elif opcode == 0x05: # tArea
+            res = get_cell_range_addr(data, pos+1, bv, reldelta)
+            if blah: print("  ", res, file=bk.logfile)
+        elif opcode == 0x09: # tMemFunc
+            nb = unpack("<H", data[pos+1:pos+3])[0]
+            if blah: print("  %d bytes of cell ref formula" % nb, file=bk.logfile)
+        elif opcode == 0x0C: #tRefN
+            res = get_cell_addr(data, pos+1, bv, reldelta=1)
+            # note *ALL* tRefN usage has signed offset for relative addresses
+            any_rel = 1
+            if blah: print("   ", res, file=bk.logfile)
+        elif opcode == 0x0D: #tAreaN
+            res = get_cell_range_addr(data, pos+1, bv, reldelta=1)
+            # note *ALL* tAreaN usage has signed offset for relative addresses
+            any_rel = 1
+            if blah: print("   ", res, file=bk.logfile)
+        elif opcode == 0x1A: # tRef3d
+            refx = unpack("<H", data[pos+1:pos+3])[0]
+            res = get_cell_addr(data, pos+3, bv, reldelta)
+            if blah: print("  ", refx, res, file=bk.logfile)
+            rowx, colx, row_rel, col_rel = res
+            any_rel = any_rel or row_rel or col_rel
+            shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+            any_err |= shx1 < -1
+            coords = (shx1, shx2+1, rowx, rowx+1, colx, colx+1)
+            if blah: print("   ", coords, file=bk.logfile)
+            if optype == 1: spush([coords])
+        elif opcode == 0x1B: # tArea3d
+            refx = unpack("<H", data[pos+1:pos+3])[0]
+            res1, res2 = get_cell_range_addr(data, pos+3, bv, reldelta)
+            if blah: print("  ", refx, res1, res2, file=bk.logfile)
+            rowx1, colx1, row_rel1, col_rel1 = res1
+            rowx2, colx2, row_rel2, col_rel2 = res2
+            any_rel = any_rel or row_rel1 or col_rel1 or row_rel2 or col_rel2
+            shx1, shx2 = get_externsheet_local_range(bk, refx, blah)
+            any_err |= shx1 < -1
+            coords = (shx1, shx2+1, rowx1, rowx2+1, colx1, colx2+1)
+            if blah: print("   ", coords, file=bk.logfile)
+            if optype == 1: spush([coords])
+        elif opcode == 0x19: # tNameX
+            refx, namex = unpack("<HH", data[pos+1:pos+5])
+            if blah: print("   refx=%d namex=%d" % (refx, namex), file=bk.logfile)
+        elif opcode in error_opcodes:
+            any_err = 1
+        else:
+            if blah: print("FORMULA: /// Not handled yet: t" + oname, file=bk.logfile)
+            any_err = 1
+        if sz <= 0:
+            print("**** Dud size; exiting ****", file=bk.logfile)
+            return
+        pos += sz
+    if blah:
+        print("End of formula. any_rel=%d any_err=%d stack=%r" %
+            (not not any_rel, any_err, stack), file=bk.logfile)
+        if len(stack) >= 2:
+            print("*** Stack has unprocessed args", file=bk.logfile)
+
+# === Some helper functions for displaying cell references ===
+
+# I'm aware of only one possibility of a sheet-relative component in
+# a reference: a 2D reference located in the "current sheet".
+# xlrd stores this internally with bounds of (0, 1, ...) and
+# relative flags of (1, 1, ...). These functions display the
+# sheet component as empty, just like Excel etc.
+
+def rownamerel(rowx, rowxrel, browx=None, r1c1=0):
+    # if no base rowx is provided, we have to return r1c1
+    if browx is None:
+        r1c1 = True
+    if not rowxrel:
+        if r1c1:
+            return "R%d" % (rowx+1)
+        return "$%d" % (rowx+1)
+    if r1c1:
+        if rowx:
+            return "R[%d]" % rowx
+        return "R"
+    return "%d" % ((browx + rowx) % 65536 + 1)
+
+def colnamerel(colx, colxrel, bcolx=None, r1c1=0):
+    # if no base colx is provided, we have to return r1c1
+    if bcolx is None:
+        r1c1 = True
+    if not colxrel:
+        if r1c1:
+            return "C%d" % (colx + 1)
+        return "$" + colname(colx)
+    if r1c1:
+        if colx:
+            return "C[%d]" % colx
+        return "C"
+    return colname((bcolx + colx) % 256)
+
+def cellname(rowx, colx):
+    """Utility function: ``(5, 7)`` => ``'H6'``"""
+    return "%s%d" % (colname(colx), rowx+1)
+
+def cellnameabs(rowx, colx, r1c1=0):
+    """Utility function: ``(5, 7)`` => ``'$H$6'``"""
+    if r1c1:
+        return "R%dC%d" % (rowx+1, colx+1)
+    return "$%s$%d" % (colname(colx), rowx+1)
+
+def cellnamerel(rowx, colx, rowxrel, colxrel, browx=None, bcolx=None, r1c1=0):
+    if not rowxrel and not colxrel:
+        return cellnameabs(rowx, colx, r1c1)
+    if (rowxrel and browx is None) or (colxrel and bcolx is None):
+        # must flip the whole cell into R1C1 mode
+        r1c1 = True
+    c = colnamerel(colx, colxrel, bcolx, r1c1)
+    r = rownamerel(rowx, rowxrel, browx, r1c1)
+    if r1c1:
+        return r + c
+    return c + r
+
+def colname(colx):
+    """Utility function: ``7`` => ``'H'``, ``27`` => ``'AB'``"""
+    alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    if colx <= 25:
+        return alphabet[colx]
+    else:
+        xdiv26, xmod26 = divmod(colx, 26)
+        return alphabet[xdiv26 - 1] + alphabet[xmod26]
+
+def rangename2d(rlo, rhi, clo, chi, r1c1=0):
+    """ ``(5, 20, 7, 10)`` => ``'$H$6:$J$20'`` """
+    if r1c1:
+        return
+    if rhi == rlo+1 and chi == clo+1:
+        return cellnameabs(rlo, clo, r1c1)
+    return "%s:%s" % (cellnameabs(rlo, clo, r1c1), cellnameabs(rhi-1, chi-1, r1c1))
+
+def rangename2drel(rlo_rhi_clo_chi, rlorel_rhirel_clorel_chirel, browx=None, bcolx=None, r1c1=0):
+    rlo, rhi, clo, chi = rlo_rhi_clo_chi
+    rlorel, rhirel, clorel, chirel = rlorel_rhirel_clorel_chirel
+    if (rlorel or rhirel) and browx is None:
+        r1c1 = True
+    if (clorel or chirel) and bcolx is None:
+        r1c1 = True
+    return "%s:%s" % (
+        cellnamerel(rlo,   clo,   rlorel, clorel, browx, bcolx, r1c1),
+        cellnamerel(rhi-1, chi-1, rhirel, chirel, browx, bcolx, r1c1),
+    )
+
+
+def rangename3d(book, ref3d):
+    """
+    Utility function:
+    ``Ref3D(1, 4, 5, 20, 7, 10)`` =>
+    ``'Sheet2:Sheet3!$H$6:$J$20'``
+    (assuming Excel's default sheetnames)
+    """
+    coords = ref3d.coords
+    return "%s!%s" % (
+        sheetrange(book, *coords[:2]),
+        rangename2d(*coords[2:6]))
+
+def rangename3drel(book, ref3d, browx=None, bcolx=None, r1c1=0):
+    """
+    Utility function:
+    ``Ref3D(coords=(0, 1, -32, -22, -13, 13), relflags=(0, 0, 1, 1, 1, 1))``
+
+    In R1C1 mode => ``'Sheet1!R[-32]C[-13]:R[-23]C[12]'``
+
+    In A1 mode => depends on base cell ``(browx, bcolx)``
+    """
+    coords = ref3d.coords
+    relflags = ref3d.relflags
+    shdesc = sheetrangerel(book, coords[:2], relflags[:2])
+    rngdesc = rangename2drel(coords[2:6], relflags[2:6], browx, bcolx, r1c1)
+    if not shdesc:
+        return rngdesc
+    return "%s!%s" % (shdesc, rngdesc)
+
+def quotedsheetname(shnames, shx):
+    if shx >= 0:
+        shname = shnames[shx]
+    else:
+        shname = {
+            -1: "?internal; any sheet?",
+            -2: "internal; deleted sheet",
+            -3: "internal; macro sheet",
+            -4: "<<external>>",
+        }.get(shx, "?error %d?" % shx)
+    if "'" in shname:
+        return "'" + shname.replace("'", "''") + "'"
+    if " " in shname:
+        return "'" + shname + "'"
+    return shname
+
+def sheetrange(book, slo, shi):
+    shnames = book.sheet_names()
+    shdesc = quotedsheetname(shnames, slo)
+    if slo != shi-1:
+        shdesc += ":" + quotedsheetname(shnames, shi-1)
+    return shdesc
+
+def sheetrangerel(book, srange, srangerel):
+    slo, shi = srange
+    slorel, shirel = srangerel
+    if not slorel and not shirel:
+        return sheetrange(book, slo, shi)
+    assert (slo == 0 == shi-1) and slorel and shirel
+    return ""
+
+# ==============================================================
diff --git a/.venv/lib/python3.12/site-packages/xlrd/info.py b/.venv/lib/python3.12/site-packages/xlrd/info.py
new file mode 100644
index 00000000..f26b6bb2
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/info.py
@@ -0,0 +1 @@
+__version__ = __VERSION__ = "2.0.1"
diff --git a/.venv/lib/python3.12/site-packages/xlrd/sheet.py b/.venv/lib/python3.12/site-packages/xlrd/sheet.py
new file mode 100644
index 00000000..a8313980
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/sheet.py
@@ -0,0 +1,2490 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2005-2013 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+
+from __future__ import print_function
+
+from array import array
+from struct import calcsize, unpack
+
+from .biffh import *
+from .formatting import Format, nearest_colour_index
+from .formula import (
+    FMLA_TYPE_CELL, FMLA_TYPE_SHARED, decompile_formula, dump_formula,
+    rangename2d,
+)
+from .timemachine import *
+
+DEBUG = 0
+OBJ_MSO_DEBUG = 0
+
+_WINDOW2_options = (
+    # Attribute names and initial values to use in case
+    # a WINDOW2 record is not written.
+    ("show_formulas", 0),
+    ("show_grid_lines", 1),
+    ("show_sheet_headers", 1),
+    ("panes_are_frozen", 0),
+    ("show_zero_values", 1),
+    ("automatic_grid_line_colour", 1),
+    ("columns_from_right_to_left", 0),
+    ("show_outline_symbols", 1),
+    ("remove_splits_if_pane_freeze_is_removed", 0),
+    # Multiple sheets can be selected, but only one can be active
+    # (hold down Ctrl and click multiple tabs in the file in OOo)
+    ("sheet_selected", 0),
+    # "sheet_visible" should really be called "sheet_active"
+    # and is 1 when this sheet is the sheet displayed when the file
+    # is open. More than likely only one sheet should ever be set as
+    # visible.
+    # This would correspond to the Book's sheet_active attribute, but
+    # that doesn't exist as WINDOW1 records aren't currently processed.
+    # The real thing is the visibility attribute from the BOUNDSHEET record.
+    ("sheet_visible", 0),
+    ("show_in_page_break_preview", 0),
+)
+
+
+
+class Sheet(BaseObject):
+    """
+    Contains the data for one worksheet.
+
+    In the cell access functions, ``rowx`` is a row index, counting from
+    zero, and ``colx`` is a column index, counting from zero.
+    Negative values for row/column indexes and slice positions are supported in
+    the expected fashion.
+
+    For information about cell types and cell values, refer to the documentation
+    of the :class:`Cell` class.
+
+    .. warning::
+
+      You don't instantiate this class yourself. You access :class:`Sheet`
+      objects via the :class:`~xlrd.book.Book` object that
+      was returned when you called :func:`xlrd.open_workbook`.
+    """
+
+    #: Name of sheet.
+    name = ''
+
+    #: A reference to the :class:`~xlrd.book.Book` object to which this sheet
+    #: belongs.
+    #:
+    #: Example usage: ``some_sheet.book.datemode``
+    book = None
+
+    #: Number of rows in sheet. A row index is in ``range(thesheet.nrows)``.
+    nrows = 0
+
+    #: Nominal number of columns in sheet. It is one more than the maximum
+    #: column index found, ignoring trailing empty cells.
+    #: See also the ``ragged_rows`` parameter to :func:`~xlrd.open_workbook`
+    #: and :meth:`~xlrd.sheet.Sheet.row_len`.
+    ncols = 0
+
+
+    #: The map from a column index to a :class:`Colinfo` object. Often there is
+    #: an entry in ``COLINFO`` records for all column indexes in ``range(257)``.
+    #:
+    #: .. note::
+    #:   xlrd ignores the entry for the non-existent
+    #:   257th column.
+    #:
+    #: On the other hand, there may be no entry for unused columns.
+    #:
+    #: .. versionadded:: 0.6.1
+    #:
+    #: Populated only if ``open_workbook(..., formatting_info=True)``
+    colinfo_map = {}
+
+    #: The map from a row index to a :class:`Rowinfo` object.
+    #:
+    #: ..note::
+    #:   It is possible to have missing entries -- at least one source of
+    #:   XLS files doesn't bother writing ``ROW`` records.
+    #:
+    #: .. versionadded:: 0.6.1
+    #:
+    #: Populated only if ``open_workbook(..., formatting_info=True)``
+    rowinfo_map = {}
+
+    #: List of address ranges of cells containing column labels.
+    #: These are set up in Excel by Insert > Name > Labels > Columns.
+    #:
+    #: .. versionadded:: 0.6.0
+    #:
+    #: How to deconstruct the list:
+    #:
+    #: .. code-block:: python
+    #:
+    #:   for crange in thesheet.col_label_ranges:
+    #:       rlo, rhi, clo, chi = crange
+    #:       for rx in xrange(rlo, rhi):
+    #:           for cx in xrange(clo, chi):
+    #:               print "Column label at (rowx=%d, colx=%d) is %r" \
+    #:                   (rx, cx, thesheet.cell_value(rx, cx))
+    col_label_ranges = []
+
+    #: List of address ranges of cells containing row labels.
+    #: For more details, see :attr:`col_label_ranges`.
+    #:
+    #: .. versionadded:: 0.6.0
+    row_label_ranges = []
+
+    #: List of address ranges of cells which have been merged.
+    #: These are set up in Excel by Format > Cells > Alignment, then ticking
+    #: the "Merge cells" box.
+    #:
+    #: .. note::
+    #:   The upper limits are exclusive: i.e. ``[2, 3, 7, 9]`` only
+    #:   spans two cells.
+    #:
+    #: .. note:: Extracted only if ``open_workbook(..., formatting_info=True)``
+    #:
+    #: .. versionadded:: 0.6.1
+    #:
+    #: How to deconstruct the list:
+    #:
+    #: .. code-block:: python
+    #:
+    #:   for crange in thesheet.merged_cells:
+    #:       rlo, rhi, clo, chi = crange
+    #:       for rowx in xrange(rlo, rhi):
+    #:           for colx in xrange(clo, chi):
+    #:               # cell (rlo, clo) (the top left one) will carry the data
+    #:               # and formatting info; the remainder will be recorded as
+    #:               # blank cells, but a renderer will apply the formatting info
+    #:               # for the top left cell (e.g. border, pattern) to all cells in
+    #:               # the range.
+    merged_cells = []
+
+    #: Mapping of ``(rowx, colx)`` to list of ``(offset, font_index)`` tuples.
+    #: The offset defines where in the string the font begins to be used.
+    #: Offsets are expected to be in ascending order.
+    #: If the first offset is not zero, the meaning is that the cell's ``XF``'s
+    #: font should be used from offset 0.
+    #:
+    #: This is a sparse mapping. There is no entry for cells that are not
+    #: formatted with rich text.
+    #:
+    #: How to use:
+    #:
+    #: .. code-block:: python
+    #:
+    #:   runlist = thesheet.rich_text_runlist_map.get((rowx, colx))
+    #:   if runlist:
+    #:       for offset, font_index in runlist:
+    #:           # do work here.
+    #:           pass
+    #:
+    #: .. versionadded:: 0.7.2
+    #:
+    #: Populated only if ``open_workbook(..., formatting_info=True)``
+    rich_text_runlist_map = {}
+
+    #: Default column width from ``DEFCOLWIDTH`` record, else ``None``.
+    #: From the OOo docs:
+    #:
+    #:   Column width in characters, using the width of the zero character
+    #:   from default font (first FONT record in the file). Excel adds some
+    #:   extra space to the default width, depending on the default font and
+    #:   default font size. The algorithm how to exactly calculate the resulting
+    #:   column width is not known.
+    #:   Example: The default width of 8 set in this record results in a column
+    #:   width of 8.43 using Arial font with a size of 10 points.
+    #:
+    #: For the default hierarchy, refer to the :class:`Colinfo` class.
+    #:
+    #: .. versionadded:: 0.6.1
+    defcolwidth = None
+
+    #: Default column width from ``STANDARDWIDTH`` record, else ``None``.
+    #:
+    #: From the OOo docs:
+    #:
+    #:   Default width of the columns in 1/256 of the width of the zero
+    #:   character, using default font (first FONT record in the file).
+    #:
+    #: For the default hierarchy, refer to the :class:`Colinfo` class.
+    #:
+    #: .. versionadded:: 0.6.1
+    standardwidth = None
+
+    #: Default value to be used for a row if there is
+    #: no ``ROW`` record for that row.
+    #: From the *optional* ``DEFAULTROWHEIGHT`` record.
+    default_row_height = None
+
+    #: Default value to be used for a row if there is
+    #: no ``ROW`` record for that row.
+    #: From the *optional* ``DEFAULTROWHEIGHT`` record.
+    default_row_height_mismatch = None
+
+    #: Default value to be used for a row if there is
+    #: no ``ROW`` record for that row.
+    #: From the *optional* ``DEFAULTROWHEIGHT`` record.
+    default_row_hidden = None
+
+    #: Default value to be used for a row if there is
+    #: no ``ROW`` record for that row.
+    #: From the *optional* ``DEFAULTROWHEIGHT`` record.
+    default_additional_space_above = None
+
+    #: Default value to be used for a row if there is
+    #: no ``ROW`` record for that row.
+    #: From the *optional* ``DEFAULTROWHEIGHT`` record.
+    default_additional_space_below = None
+
+    #: Visibility of the sheet:
+    #: ::
+    #:
+    #:   0 = visible
+    #:   1 = hidden (can be unhidden by user -- Format -> Sheet -> Unhide)
+    #:   2 = "very hidden" (can be unhidden only by VBA macro).
+    visibility = 0
+
+    #: A 256-element tuple corresponding to the contents of the GCW record for
+    #: this sheet. If no such record, treat as all bits zero.
+    #: Applies to BIFF4-7 only. See docs of the :class:`Colinfo` class for
+    #: discussion.
+    gcw = (0, ) * 256
+
+    #: A list of :class:`Hyperlink` objects corresponding to ``HLINK`` records
+    #: found in the worksheet.
+    #:
+    #: .. versionadded:: 0.7.2
+    hyperlink_list = []
+
+    #: A sparse mapping from ``(rowx, colx)`` to an item in
+    #: :attr:`~xlrd.sheet.Sheet.hyperlink_list`.
+    #: Cells not covered by a hyperlink are not mapped.
+    #: It is possible using the Excel UI to set up a hyperlink that
+    #: covers a larger-than-1x1 rectangle of cells.
+    #: Hyperlink rectangles may overlap (Excel doesn't check).
+    #: When a multiply-covered cell is clicked on, the hyperlink that is
+    #: activated
+    #: (and the one that is mapped here) is the last in
+    #: :attr:`~xlrd.sheet.Sheet.hyperlink_list`.
+    #:
+    #: .. versionadded:: 0.7.2
+    hyperlink_map = {}
+
+    #: A sparse mapping from ``(rowx, colx)`` to a :class:`Note` object.
+    #: Cells not containing a note ("comment") are not mapped.
+    #:
+    #: .. versionadded:: 0.7.2
+    cell_note_map = {}
+
+    #: Number of columns in left pane (frozen panes; for split panes, see
+    #: comments in code)
+    vert_split_pos = 0
+
+    #: Number of rows in top pane (frozen panes; for split panes, see comments
+    #: in code)
+    horz_split_pos = 0
+
+    #: Index of first visible row in bottom frozen/split pane
+    horz_split_first_visible = 0
+
+    #: Index of first visible column in right frozen/split pane
+    vert_split_first_visible = 0
+
+    #: Frozen panes: ignore it. Split panes: explanation and diagrams in
+    #: OOo docs.
+    split_active_pane = 0
+
+    #: Boolean specifying if a ``PANE`` record was present, ignore unless you're
+    #: ``xlutils.copy``
+    has_pane_record = 0
+
+    #: A list of the horizontal page breaks in this sheet.
+    #: Breaks are tuples in the form
+    #: ``(index of row after break, start col index, end col index)``.
+    #:
+    #: Populated only if ``open_workbook(..., formatting_info=True)``
+    #:
+    #: .. versionadded:: 0.7.2
+    horizontal_page_breaks = []
+
+    #: A list of the vertical page breaks in this sheet.
+    #: Breaks are tuples in the form
+    #: ``(index of col after break, start row index, end row index)``.
+    #:
+    #: Populated only if ``open_workbook(..., formatting_info=True)``
+    #:
+    #: .. versionadded:: 0.7.2
+    vertical_page_breaks = []
+
+    def __init__(self, book, position, name, number):
+        self.book = book
+        self.biff_version = book.biff_version
+        self._position = position
+        self.logfile = book.logfile
+        self.bt = array('B', [XL_CELL_EMPTY])
+        self.bf = array('h', [-1])
+        self.name = name
+        self.number = number
+        self.verbosity = book.verbosity
+        self.formatting_info = book.formatting_info
+        self.ragged_rows = book.ragged_rows
+        if self.ragged_rows:
+            self.put_cell = self.put_cell_ragged
+        else:
+            self.put_cell = self.put_cell_unragged
+        self._xf_index_to_xl_type_map = book._xf_index_to_xl_type_map
+        self.nrows = 0 # actual, including possibly empty cells
+        self.ncols = 0
+        self._maxdatarowx = -1 # highest rowx containing a non-empty cell
+        self._maxdatacolx = -1 # highest colx containing a non-empty cell
+        self._dimnrows = 0 # as per DIMENSIONS record
+        self._dimncols = 0
+        self._cell_values = []
+        self._cell_types = []
+        self._cell_xf_indexes = []
+        self.defcolwidth = None
+        self.standardwidth = None
+        self.default_row_height = None
+        self.default_row_height_mismatch = 0
+        self.default_row_hidden = 0
+        self.default_additional_space_above = 0
+        self.default_additional_space_below = 0
+        self.colinfo_map = {}
+        self.rowinfo_map = {}
+        self.col_label_ranges = []
+        self.row_label_ranges = []
+        self.merged_cells = []
+        self.rich_text_runlist_map = {}
+        self.horizontal_page_breaks = []
+        self.vertical_page_breaks = []
+        self._xf_index_stats = [0, 0, 0, 0]
+        self.visibility = book._sheet_visibility[number] # from BOUNDSHEET record
+        for attr, defval in _WINDOW2_options:
+            setattr(self, attr, defval)
+        self.first_visible_rowx = 0
+        self.first_visible_colx = 0
+        self.gridline_colour_index = 0x40
+        self.gridline_colour_rgb = None # pre-BIFF8
+        self.hyperlink_list = []
+        self.hyperlink_map = {}
+        self.cell_note_map = {}
+
+        # Values calculated by xlrd to predict the mag factors that
+        # will actually be used by Excel to display your worksheet.
+        # Pass these values to xlwt when writing XLS files.
+        # Warning 1: Behaviour of OOo Calc and Gnumeric has been observed to differ from Excel's.
+        # Warning 2: A value of zero means almost exactly what it says. Your sheet will be
+        # displayed as a very tiny speck on the screen. xlwt will reject attempts to set
+        # a mag_factor that is not (10 <= mag_factor <= 400).
+        self.cooked_page_break_preview_mag_factor = 60
+        self.cooked_normal_view_mag_factor = 100
+
+        # Values (if any) actually stored on the XLS file
+        self.cached_page_break_preview_mag_factor = 0  # default (60%), from WINDOW2 record
+        self.cached_normal_view_mag_factor = 0  # default (100%), from WINDOW2 record
+        self.scl_mag_factor = None # from SCL record
+
+        self._ixfe = None # BIFF2 only
+        self._cell_attr_to_xfx = {} # BIFF2.0 only
+
+        if self.biff_version >= 80:
+            self.utter_max_rows = 65536
+        else:
+            self.utter_max_rows = 16384
+        self.utter_max_cols = 256
+
+        self._first_full_rowx = -1
+
+        # self._put_cell_exceptions = 0
+        # self._put_cell_row_widenings = 0
+        # self._put_cell_rows_appended = 0
+        # self._put_cell_cells_appended = 0
+
+    def cell(self, rowx, colx):
+        """
+        :class:`Cell` object in the given row and column.
+        """
+        if self.formatting_info:
+            xfx = self.cell_xf_index(rowx, colx)
+        else:
+            xfx = None
+        return Cell(
+            self._cell_types[rowx][colx],
+            self._cell_values[rowx][colx],
+            xfx,
+        )
+
+    def cell_value(self, rowx, colx):
+        "Value of the cell in the given row and column."
+        return self._cell_values[rowx][colx]
+
+    def cell_type(self, rowx, colx):
+        """
+        Type of the cell in the given row and column.
+
+        Refer to the documentation of the :class:`Cell` class.
+        """
+        return self._cell_types[rowx][colx]
+
+    def cell_xf_index(self, rowx, colx):
+        """
+        XF index of the cell in the given row and column.
+        This is an index into :attr:`~xlrd.book.Book.xf_list`.
+
+        .. versionadded:: 0.6.1
+        """
+        self.req_fmt_info()
+        xfx = self._cell_xf_indexes[rowx][colx]
+        if xfx > -1:
+            self._xf_index_stats[0] += 1
+            return xfx
+        # Check for a row xf_index
+        try:
+            xfx = self.rowinfo_map[rowx].xf_index
+            if xfx > -1:
+                self._xf_index_stats[1] += 1
+                return xfx
+        except KeyError:
+            pass
+        # Check for a column xf_index
+        try:
+            xfx = self.colinfo_map[colx].xf_index
+            if xfx == -1: xfx = 15
+            self._xf_index_stats[2] += 1
+            return xfx
+        except KeyError:
+            # If all else fails, 15 is used as hardwired global default xf_index.
+            self._xf_index_stats[3] += 1
+            return 15
+
+    def row_len(self, rowx):
+        """
+        Returns the effective number of cells in the given row. For use with
+        ``open_workbook(ragged_rows=True)`` which is likely to produce rows
+        with fewer than :attr:`~Sheet.ncols` cells.
+
+        .. versionadded:: 0.7.2
+        """
+        return len(self._cell_values[rowx])
+
+    def row(self, rowx):
+        """
+        Returns a sequence of the :class:`Cell` objects in the given row.
+        """
+        return [
+            self.cell(rowx, colx)
+            for colx in xrange(len(self._cell_values[rowx]))
+        ]
+
+    def __getitem__(self, item):
+        """
+        Takes either rowindex or (rowindex, colindex) as an index,
+        and returns either row or cell respectively.
+        """
+        try:
+            rowix, colix = item
+        except TypeError:
+            # it's not a tuple (or of right size), let's try indexing as is
+            # if this is a problem, let this error propagate back
+            return self.row(item)
+        else:
+            return self.cell(rowix, colix)
+
+    def get_rows(self):
+        "Returns a generator for iterating through each row."
+        return (self.row(index) for index in range(self.nrows))
+
+    # makes `for row in sheet` natural and intuitive
+    __iter__ = get_rows
+
+    def row_types(self, rowx, start_colx=0, end_colx=None):
+        """
+        Returns a slice of the types of the cells in the given row.
+        """
+        if end_colx is None:
+            return self._cell_types[rowx][start_colx:]
+        return self._cell_types[rowx][start_colx:end_colx]
+
+    def row_values(self, rowx, start_colx=0, end_colx=None):
+        """
+        Returns a slice of the values of the cells in the given row.
+        """
+        if end_colx is None:
+            return self._cell_values[rowx][start_colx:]
+        return self._cell_values[rowx][start_colx:end_colx]
+
+    def row_slice(self, rowx, start_colx=0, end_colx=None):
+        """
+        Returns a slice of the :class:`Cell` objects in the given row.
+        """
+        nc = len(self._cell_values[rowx])
+        if start_colx < 0:
+            start_colx += nc
+            if start_colx < 0:
+                start_colx = 0
+        if end_colx is None or end_colx > nc:
+            end_colx = nc
+        elif end_colx < 0:
+            end_colx += nc
+        return [
+            self.cell(rowx, colx)
+            for colx in xrange(start_colx, end_colx)
+        ]
+
+    def col_slice(self, colx, start_rowx=0, end_rowx=None):
+        """
+        Returns a slice of the :class:`Cell` objects in the given column.
+        """
+        nr = self.nrows
+        if start_rowx < 0:
+            start_rowx += nr
+            if start_rowx < 0:
+                start_rowx = 0
+        if end_rowx is None or end_rowx > nr:
+            end_rowx = nr
+        elif end_rowx < 0:
+            end_rowx += nr
+        return [
+            self.cell(rowx, colx)
+            for rowx in xrange(start_rowx, end_rowx)
+        ]
+
+    def col_values(self, colx, start_rowx=0, end_rowx=None):
+        """
+        Returns a slice of the values of the cells in the given column.
+        """
+        nr = self.nrows
+        if start_rowx < 0:
+            start_rowx += nr
+            if start_rowx < 0:
+                start_rowx = 0
+        if end_rowx is None or end_rowx > nr:
+            end_rowx = nr
+        elif end_rowx < 0:
+            end_rowx += nr
+        return [
+            self._cell_values[rowx][colx]
+            for rowx in xrange(start_rowx, end_rowx)
+        ]
+
+    def col_types(self, colx, start_rowx=0, end_rowx=None):
+        """
+        Returns a slice of the types of the cells in the given column.
+        """
+        nr = self.nrows
+        if start_rowx < 0:
+            start_rowx += nr
+            if start_rowx < 0:
+                start_rowx = 0
+        if end_rowx is None or end_rowx > nr:
+            end_rowx = nr
+        elif end_rowx < 0:
+            end_rowx += nr
+        return [
+            self._cell_types[rowx][colx]
+            for rowx in xrange(start_rowx, end_rowx)
+        ]
+
+    col = col_slice
+
+    # === Following methods are used in building the worksheet.
+    # === They are not part of the API.
+
+    def tidy_dimensions(self):
+        if self.verbosity >= 3:
+            fprintf(
+                self.logfile,
+                "tidy_dimensions: nrows=%d ncols=%d \n",
+                self.nrows, self.ncols,
+            )
+        if 1 and self.merged_cells:
+            nr = nc = 0
+            umaxrows = self.utter_max_rows
+            umaxcols = self.utter_max_cols
+            for crange in self.merged_cells:
+                rlo, rhi, clo, chi = crange
+                if not (0 <= rlo < rhi <= umaxrows) or not (0 <= clo < chi <= umaxcols):
+                    fprintf(self.logfile,
+                        "*** WARNING: sheet #%d (%r), MERGEDCELLS bad range %r\n",
+                        self.number, self.name, crange)
+                if rhi > nr: nr = rhi
+                if chi > nc: nc = chi
+            if nc > self.ncols:
+                self.ncols = nc
+                self._first_full_rowx = -2
+            if nr > self.nrows:
+                # we put one empty cell at (nr-1,0) to make sure
+                # we have the right number of rows. The ragged rows
+                # will sort out the rest if needed.
+                self.put_cell(nr-1, 0, XL_CELL_EMPTY, UNICODE_LITERAL(''), -1)
+        if (self.verbosity >= 1 and
+                (self.nrows != self._dimnrows or self.ncols != self._dimncols)):
+            fprintf(
+                self.logfile,
+                "NOTE *** sheet %d (%r): DIMENSIONS R,C = %d,%d should be %d,%d\n",
+                self.number,
+                self.name,
+                self._dimnrows,
+                self._dimncols,
+                self.nrows,
+                self.ncols,
+            )
+        if not self.ragged_rows:
+            # fix ragged rows
+            ncols = self.ncols
+            s_cell_types = self._cell_types
+            s_cell_values = self._cell_values
+            s_cell_xf_indexes = self._cell_xf_indexes
+            s_fmt_info = self.formatting_info
+            # for rowx in xrange(self.nrows):
+            if self._first_full_rowx == -2:
+                ubound = self.nrows
+            else:
+                ubound = self._first_full_rowx
+            for rowx in xrange(ubound):
+                trow = s_cell_types[rowx]
+                rlen = len(trow)
+                nextra = ncols - rlen
+                if nextra > 0:
+                    s_cell_values[rowx][rlen:] = [UNICODE_LITERAL('')] * nextra
+                    trow[rlen:] = self.bt * nextra
+                    if s_fmt_info:
+                        s_cell_xf_indexes[rowx][rlen:] = self.bf * nextra
+
+    def put_cell_ragged(self, rowx, colx, ctype, value, xf_index):
+        if ctype is None:
+            # we have a number, so look up the cell type
+            ctype = self._xf_index_to_xl_type_map[xf_index]
+        assert 0 <= colx < self.utter_max_cols
+        assert 0 <= rowx < self.utter_max_rows
+        fmt_info = self.formatting_info
+
+        try:
+            nr = rowx + 1
+            if self.nrows < nr:
+
+                scta = self._cell_types.append
+                scva = self._cell_values.append
+                scxa = self._cell_xf_indexes.append
+                bt = self.bt
+                bf = self.bf
+                for _unused in xrange(self.nrows, nr):
+                    scta(bt * 0)
+                    scva([])
+                    if fmt_info:
+                        scxa(bf * 0)
+                self.nrows = nr
+
+            types_row = self._cell_types[rowx]
+            values_row = self._cell_values[rowx]
+            if fmt_info:
+                fmt_row = self._cell_xf_indexes[rowx]
+            ltr = len(types_row)
+            if colx >= self.ncols:
+                self.ncols = colx + 1
+            num_empty = colx - ltr
+            if not num_empty:
+                # most common case: colx == previous colx + 1
+                # self._put_cell_cells_appended += 1
+                types_row.append(ctype)
+                values_row.append(value)
+                if fmt_info:
+                    fmt_row.append(xf_index)
+                return
+            if num_empty > 0:
+                num_empty += 1
+                # self._put_cell_row_widenings += 1
+                # types_row.extend(self.bt * num_empty)
+                # values_row.extend([UNICODE_LITERAL('')] * num_empty)
+                # if fmt_info:
+                #     fmt_row.extend(self.bf * num_empty)
+                types_row[ltr:] = self.bt * num_empty
+                values_row[ltr:] = [UNICODE_LITERAL('')] * num_empty
+                if fmt_info:
+                    fmt_row[ltr:] = self.bf * num_empty
+            types_row[colx] = ctype
+            values_row[colx] = value
+            if fmt_info:
+                fmt_row[colx] = xf_index
+        except:
+            print("put_cell", rowx, colx, file=self.logfile)
+            raise
+
+    def put_cell_unragged(self, rowx, colx, ctype, value, xf_index):
+        if ctype is None:
+            # we have a number, so look up the cell type
+            ctype = self._xf_index_to_xl_type_map[xf_index]
+        # assert 0 <= colx < self.utter_max_cols
+        # assert 0 <= rowx < self.utter_max_rows
+        try:
+            self._cell_types[rowx][colx] = ctype
+            self._cell_values[rowx][colx] = value
+            if self.formatting_info:
+                self._cell_xf_indexes[rowx][colx] = xf_index
+        except IndexError:
+            # print >> self.logfile, "put_cell extending", rowx, colx
+            # self.extend_cells(rowx+1, colx+1)
+            # self._put_cell_exceptions += 1
+            nr = rowx + 1
+            nc = colx + 1
+            assert 1 <= nc <= self.utter_max_cols
+            assert 1 <= nr <= self.utter_max_rows
+            if nc > self.ncols:
+                self.ncols = nc
+                # The row self._first_full_rowx and all subsequent rows
+                # are guaranteed to have length == self.ncols. Thus the
+                # "fix ragged rows" section of the tidy_dimensions method
+                # doesn't need to examine them.
+                if nr < self.nrows:
+                    # cell data is not in non-descending row order *AND*
+                    # self.ncols has been bumped up.
+                    # This very rare case ruins this optimisation.
+                    self._first_full_rowx = -2
+                elif rowx > self._first_full_rowx > -2:
+                    self._first_full_rowx = rowx
+            if nr <= self.nrows:
+                # New cell is in an existing row, so extend that row (if necessary).
+                # Note that nr < self.nrows means that the cell data
+                # is not in ascending row order!!
+                trow = self._cell_types[rowx]
+                nextra = self.ncols - len(trow)
+                if nextra > 0:
+                    # self._put_cell_row_widenings += 1
+                    trow.extend(self.bt * nextra)
+                    if self.formatting_info:
+                        self._cell_xf_indexes[rowx].extend(self.bf * nextra)
+                    self._cell_values[rowx].extend([UNICODE_LITERAL('')] * nextra)
+            else:
+                scta = self._cell_types.append
+                scva = self._cell_values.append
+                scxa = self._cell_xf_indexes.append
+                fmt_info = self.formatting_info
+                nc = self.ncols
+                bt = self.bt
+                bf = self.bf
+                for _unused in xrange(self.nrows, nr):
+                    # self._put_cell_rows_appended += 1
+                    scta(bt * nc)
+                    scva([UNICODE_LITERAL('')] * nc)
+                    if fmt_info:
+                        scxa(bf * nc)
+                self.nrows = nr
+            # === end of code from extend_cells()
+            try:
+                self._cell_types[rowx][colx] = ctype
+                self._cell_values[rowx][colx] = value
+                if self.formatting_info:
+                    self._cell_xf_indexes[rowx][colx] = xf_index
+            except:
+                print("put_cell", rowx, colx, file=self.logfile)
+                raise
+        except:
+            print("put_cell", rowx, colx, file=self.logfile)
+            raise
+
+
+    # === Methods after this line neither know nor care about how cells are stored.
+
+    def read(self, bk):
+        global rc_stats
+        DEBUG = 0
+        blah = DEBUG or self.verbosity >= 2
+        blah_rows = DEBUG or self.verbosity >= 4
+        blah_formulas = 0 and blah
+        r1c1 = 0
+        oldpos = bk._position
+        bk._position = self._position
+        XL_SHRFMLA_ETC_ETC = (
+            XL_SHRFMLA, XL_ARRAY, XL_TABLEOP, XL_TABLEOP2,
+            XL_ARRAY2, XL_TABLEOP_B2,
+        )
+        self_put_cell = self.put_cell
+        local_unpack = unpack
+        bk_get_record_parts = bk.get_record_parts
+        bv = self.biff_version
+        fmt_info = self.formatting_info
+        do_sst_rich_text = fmt_info and bk._rich_text_runlist_map
+        rowinfo_sharing_dict = {}
+        txos = {}
+        eof_found = 0
+        while 1:
+            # if DEBUG: print "SHEET.READ: about to read from position %d" % bk._position
+            rc, data_len, data = bk_get_record_parts()
+            # if rc in rc_stats:
+            #     rc_stats[rc] += 1
+            # else:
+            #     rc_stats[rc] = 1
+            # if DEBUG: print "SHEET.READ: op 0x%04x, %d bytes %r" % (rc, data_len, data)
+            if rc == XL_NUMBER:
+                # [:14] in following stmt ignores extraneous rubbish at end of record.
+                # Sample file testEON-8.xls supplied by Jan Kraus.
+                rowx, colx, xf_index, d = local_unpack('<HHHd', data[:14])
+                # if xf_index == 0:
+                #     fprintf(self.logfile,
+                #         "NUMBER: r=%d c=%d xfx=%d %f\n", rowx, colx, xf_index, d)
+                self_put_cell(rowx, colx, None, d, xf_index)
+            elif rc == XL_LABELSST:
+                rowx, colx, xf_index, sstindex = local_unpack('<HHHi', data)
+                # print "LABELSST", rowx, colx, sstindex, bk._sharedstrings[sstindex]
+                self_put_cell(rowx, colx, XL_CELL_TEXT, bk._sharedstrings[sstindex], xf_index)
+                if do_sst_rich_text:
+                    runlist = bk._rich_text_runlist_map.get(sstindex)
+                    if runlist:
+                        self.rich_text_runlist_map[(rowx, colx)] = runlist
+            elif rc == XL_LABEL:
+                rowx, colx, xf_index = local_unpack('<HHH', data[0:6])
+                if bv < BIFF_FIRST_UNICODE:
+                    strg = unpack_string(data, 6, bk.encoding or bk.derive_encoding(), lenlen=2)
+                else:
+                    strg = unpack_unicode(data, 6, lenlen=2)
+                self_put_cell(rowx, colx, XL_CELL_TEXT, strg, xf_index)
+            elif rc == XL_RSTRING:
+                rowx, colx, xf_index = local_unpack('<HHH', data[0:6])
+                if bv < BIFF_FIRST_UNICODE:
+                    strg, pos = unpack_string_update_pos(data, 6, bk.encoding or bk.derive_encoding(), lenlen=2)
+                    nrt = BYTES_ORD(data[pos])
+                    pos += 1
+                    runlist = []
+                    for _unused in xrange(nrt):
+                        runlist.append(unpack('<BB', data[pos:pos+2]))
+                        pos += 2
+                    assert pos == len(data)
+                else:
+                    strg, pos = unpack_unicode_update_pos(data, 6, lenlen=2)
+                    nrt = unpack('<H', data[pos:pos+2])[0]
+                    pos += 2
+                    runlist = []
+                    for _unused in xrange(nrt):
+                        runlist.append(unpack('<HH', data[pos:pos+4]))
+                        pos += 4
+                    assert pos == len(data)
+                self_put_cell(rowx, colx, XL_CELL_TEXT, strg, xf_index)
+                self.rich_text_runlist_map[(rowx, colx)] = runlist
+            elif rc == XL_RK:
+                rowx, colx, xf_index = local_unpack('<HHH', data[:6])
+                d = unpack_RK(data[6:10])
+                self_put_cell(rowx, colx, None, d, xf_index)
+            elif rc == XL_MULRK:
+                mulrk_row, mulrk_first = local_unpack('<HH', data[0:4])
+                mulrk_last, = local_unpack('<H', data[-2:])
+                pos = 4
+                for colx in xrange(mulrk_first, mulrk_last+1):
+                    xf_index, = local_unpack('<H', data[pos:pos+2])
+                    d = unpack_RK(data[pos+2:pos+6])
+                    pos += 6
+                    self_put_cell(mulrk_row, colx, None, d, xf_index)
+            elif rc == XL_ROW:
+                # Version 0.6.0a3: ROW records are just not worth using (for memory allocation).
+                # Version 0.6.1: now used for formatting info.
+                if not fmt_info: continue
+                rowx, bits1, bits2 = local_unpack('<H4xH4xi', data[0:16])
+                if not(0 <= rowx < self.utter_max_rows):
+                    print("*** NOTE: ROW record has row index %d; "
+                        "should have 0 <= rowx < %d -- record ignored!"
+                        % (rowx, self.utter_max_rows), file=self.logfile)
+                    continue
+                key = (bits1, bits2)
+                r = rowinfo_sharing_dict.get(key)
+                if r is None:
+                    rowinfo_sharing_dict[key] = r = Rowinfo()
+                    # Using upkbits() is far too slow on a file
+                    # with 30 sheets each with 10K rows :-(
+                    #    upkbits(r, bits1, (
+                    #        ( 0, 0x7FFF, 'height'),
+                    #        (15, 0x8000, 'has_default_height'),
+                    #        ))
+                    #    upkbits(r, bits2, (
+                    #        ( 0, 0x00000007, 'outline_level'),
+                    #        ( 4, 0x00000010, 'outline_group_starts_ends'),
+                    #        ( 5, 0x00000020, 'hidden'),
+                    #        ( 6, 0x00000040, 'height_mismatch'),
+                    #        ( 7, 0x00000080, 'has_default_xf_index'),
+                    #        (16, 0x0FFF0000, 'xf_index'),
+                    #        (28, 0x10000000, 'additional_space_above'),
+                    #        (29, 0x20000000, 'additional_space_below'),
+                    #        ))
+                    # So:
+                    r.height = bits1 & 0x7fff
+                    r.has_default_height = (bits1 >> 15) & 1
+                    r.outline_level = bits2 & 7
+                    r.outline_group_starts_ends = (bits2 >> 4) & 1
+                    r.hidden = (bits2 >> 5) & 1
+                    r.height_mismatch = (bits2 >> 6) & 1
+                    r.has_default_xf_index = (bits2 >> 7) & 1
+                    r.xf_index = (bits2 >> 16) & 0xfff
+                    r.additional_space_above = (bits2 >> 28) & 1
+                    r.additional_space_below = (bits2 >> 29) & 1
+                    if not r.has_default_xf_index:
+                        r.xf_index = -1
+                self.rowinfo_map[rowx] = r
+                if 0 and r.xf_index > -1:
+                    fprintf(self.logfile,
+                        "**ROW %d %d %d\n",
+                        self.number, rowx, r.xf_index)
+                if blah_rows:
+                    print('ROW', rowx, bits1, bits2, file=self.logfile)
+                    r.dump(self.logfile,
+                        header="--- sh #%d, rowx=%d ---" % (self.number, rowx))
+            elif rc in XL_FORMULA_OPCODES: # 06, 0206, 0406
+                # DEBUG = 1
+                # if DEBUG: print "FORMULA: rc: 0x%04x data: %r" % (rc, data)
+                if bv >= 50:
+                    rowx, colx, xf_index, result_str, flags = local_unpack('<HHH8sH', data[0:16])
+                elif bv >= 30:
+                    rowx, colx, xf_index, result_str, flags = local_unpack('<HHH8sH', data[0:16])
+                else: # BIFF2
+                    rowx, colx, cell_attr,  result_str, flags = local_unpack('<HH3s8sB', data[0:16])
+                    xf_index =  self.fixed_BIFF2_xfindex(cell_attr, rowx, colx)
+                if blah_formulas: # testing formula dumper
+                    #### XXXX FIXME
+                    fprintf(self.logfile, "FORMULA: rowx=%d colx=%d\n", rowx, colx)
+                    fmlalen = local_unpack("<H", data[20:22])[0]
+                    decompile_formula(bk, data[22:], fmlalen, FMLA_TYPE_CELL,
+                        browx=rowx, bcolx=colx, blah=1, r1c1=r1c1)
+                if result_str[6:8] == b"\xFF\xFF":
+                    first_byte = BYTES_ORD(result_str[0])
+                    if first_byte == 0:
+                        # need to read next record (STRING)
+                        gotstring = 0
+                        # if flags & 8:
+                        if 1: # "flags & 8" applies only to SHRFMLA
+                            # actually there's an optional SHRFMLA or ARRAY etc record to skip over
+                            rc2, data2_len, data2 = bk.get_record_parts()
+                            if rc2 == XL_STRING or rc2 == XL_STRING_B2:
+                                gotstring = 1
+                            elif rc2 == XL_ARRAY:
+                                row1x, rownx, col1x, colnx, array_flags, tokslen = \
+                                    local_unpack("<HHBBBxxxxxH", data2[:14])
+                                if blah_formulas:
+                                    fprintf(self.logfile, "ARRAY: %d %d %d %d %d\n",
+                                        row1x, rownx, col1x, colnx, array_flags)
+                                    # dump_formula(bk, data2[14:], tokslen, bv, reldelta=0, blah=1)
+                            elif rc2 == XL_SHRFMLA:
+                                row1x, rownx, col1x, colnx, nfmlas, tokslen = \
+                                    local_unpack("<HHBBxBH", data2[:10])
+                                if blah_formulas:
+                                    fprintf(self.logfile, "SHRFMLA (sub): %d %d %d %d %d\n",
+                                        row1x, rownx, col1x, colnx, nfmlas)
+                                    decompile_formula(bk, data2[10:], tokslen, FMLA_TYPE_SHARED,
+                                        blah=1, browx=rowx, bcolx=colx, r1c1=r1c1)
+                            elif rc2 not in XL_SHRFMLA_ETC_ETC:
+                                raise XLRDError(
+                                    "Expected SHRFMLA, ARRAY, TABLEOP* or STRING record; found 0x%04x" % rc2)
+                            # if DEBUG: print "gotstring:", gotstring
+                        # now for the STRING record
+                        if not gotstring:
+                            rc2, _unused_len, data2 = bk.get_record_parts()
+                            if rc2 not in (XL_STRING, XL_STRING_B2):
+                                raise XLRDError("Expected STRING record; found 0x%04x" % rc2)
+                        # if DEBUG: print "STRING: data=%r BIFF=%d cp=%d" % (data2, self.biff_version, bk.encoding)
+                        strg = self.string_record_contents(data2)
+                        self.put_cell(rowx, colx, XL_CELL_TEXT, strg, xf_index)
+                        # if DEBUG: print "FORMULA strg %r" % strg
+                    elif first_byte == 1:
+                        # boolean formula result
+                        value = BYTES_ORD(result_str[2])
+                        self_put_cell(rowx, colx, XL_CELL_BOOLEAN, value, xf_index)
+                    elif first_byte == 2:
+                        # Error in cell
+                        value = BYTES_ORD(result_str[2])
+                        self_put_cell(rowx, colx, XL_CELL_ERROR, value, xf_index)
+                    elif first_byte == 3:
+                        # empty ... i.e. empty (zero-length) string, NOT an empty cell.
+                        self_put_cell(rowx, colx, XL_CELL_TEXT, "", xf_index)
+                    else:
+                        raise XLRDError("unexpected special case (0x%02x) in FORMULA" % first_byte)
+                else:
+                    # it is a number
+                    d = local_unpack('<d', result_str)[0]
+                    self_put_cell(rowx, colx, None, d, xf_index)
+            elif rc == XL_BOOLERR:
+                rowx, colx, xf_index, value, is_err = local_unpack('<HHHBB', data[:8])
+                # Note OOo Calc 2.0 writes 9-byte BOOLERR records.
+                # OOo docs say 8. Excel writes 8.
+                cellty = (XL_CELL_BOOLEAN, XL_CELL_ERROR)[is_err]
+                # if DEBUG: print "XL_BOOLERR", rowx, colx, xf_index, value, is_err
+                self_put_cell(rowx, colx, cellty, value, xf_index)
+            elif rc == XL_COLINFO:
+                if not fmt_info: continue
+                c = Colinfo()
+                first_colx, last_colx, c.width, c.xf_index, flags \
+                    = local_unpack("<HHHHH", data[:10])
+                #### Colinfo.width is denominated in 256ths of a character,
+                #### *not* in characters.
+                if not(0 <= first_colx <= last_colx <= 256):
+                    # Note: 256 instead of 255 is a common mistake.
+                    # We silently ignore the non-existing 257th column in that case.
+                    print("*** NOTE: COLINFO record has first col index %d, last %d; "
+                        "should have 0 <= first <= last <= 255 -- record ignored!"
+                        % (first_colx, last_colx), file=self.logfile)
+                    del c
+                    continue
+                upkbits(c, flags, (
+                    ( 0, 0x0001, 'hidden'),
+                    ( 1, 0x0002, 'bit1_flag'),
+                    # *ALL* colinfos created by Excel in "default" cases are 0x0002!!
+                    # Maybe it's "locked" by analogy with XFProtection data.
+                    ( 8, 0x0700, 'outline_level'),
+                    (12, 0x1000, 'collapsed'),
+                ))
+                for colx in xrange(first_colx, last_colx+1):
+                    if colx > 255: break # Excel does 0 to 256 inclusive
+                    self.colinfo_map[colx] = c
+                    if 0:
+                        fprintf(self.logfile,
+                            "**COL %d %d %d\n",
+                            self.number, colx, c.xf_index)
+                if blah:
+                    fprintf(
+                        self.logfile,
+                        "COLINFO sheet #%d cols %d-%d: wid=%d xf_index=%d flags=0x%04x\n",
+                        self.number, first_colx, last_colx, c.width, c.xf_index, flags,
+                    )
+                    c.dump(self.logfile, header='===')
+            elif rc == XL_DEFCOLWIDTH:
+                self.defcolwidth, = local_unpack("<H", data[:2])
+                if 0: print('DEFCOLWIDTH', self.defcolwidth, file=self.logfile)
+            elif rc == XL_STANDARDWIDTH:
+                if data_len != 2:
+                    print('*** ERROR *** STANDARDWIDTH', data_len, repr(data), file=self.logfile)
+                self.standardwidth, = local_unpack("<H", data[:2])
+                if 0: print('STANDARDWIDTH', self.standardwidth, file=self.logfile)
+            elif rc == XL_GCW:
+                if not fmt_info: continue # useless w/o COLINFO
+                assert data_len == 34
+                assert data[0:2] == b"\x20\x00"
+                iguff = unpack("<8i", data[2:34])
+                gcw = []
+                for bits in iguff:
+                    for j in xrange(32):
+                        gcw.append(bits & 1)
+                        bits >>= 1
+                self.gcw = tuple(gcw)
+                if 0:
+                    showgcw = "".join(map(lambda x: "F "[x], gcw)).rstrip().replace(' ', '.')
+                    print("GCW:", showgcw, file=self.logfile)
+            elif rc == XL_BLANK:
+                if not fmt_info: continue
+                rowx, colx, xf_index = local_unpack('<HHH', data[:6])
+                # if 0: print >> self.logfile, "BLANK", rowx, colx, xf_index
+                self_put_cell(rowx, colx, XL_CELL_BLANK, '', xf_index)
+            elif rc == XL_MULBLANK: # 00BE
+                if not fmt_info: continue
+                nitems = data_len >> 1
+                result = local_unpack("<%dH" % nitems, data)
+                rowx, mul_first = result[:2]
+                mul_last = result[-1]
+                # print >> self.logfile, "MULBLANK", rowx, mul_first, mul_last, data_len, nitems, mul_last + 4 - mul_first
+                assert nitems == mul_last + 4 - mul_first
+                pos = 2
+                for colx in xrange(mul_first, mul_last + 1):
+                    self_put_cell(rowx, colx, XL_CELL_BLANK, '', result[pos])
+                    pos += 1
+            elif rc == XL_DIMENSION or rc == XL_DIMENSION2:
+                if data_len == 0:
+                    # Four zero bytes after some other record. See github issue 64.
+                    continue
+                # if data_len == 10:
+                # Was crashing on BIFF 4.0 file w/o the two trailing unused bytes.
+                # Reported by Ralph Heimburger.
+                if bv < 80:
+                    dim_tuple = local_unpack('<HxxH', data[2:8])
+                else:
+                    dim_tuple = local_unpack('<ixxH', data[4:12])
+                self.nrows, self.ncols = 0, 0
+                self._dimnrows, self._dimncols = dim_tuple
+                if bv in (21, 30, 40) and self.book.xf_list and not self.book._xf_epilogue_done:
+                    self.book.xf_epilogue()
+                if blah:
+                    fprintf(
+                        self.logfile,
+                        "sheet %d(%r) DIMENSIONS: ncols=%d nrows=%d\n",
+                        self.number, self.name, self._dimncols, self._dimnrows
+                    )
+            elif rc == XL_HLINK:
+                self.handle_hlink(data)
+            elif rc == XL_QUICKTIP:
+                self.handle_quicktip(data)
+            elif rc == XL_EOF:
+                DEBUG = 0
+                if DEBUG: print("SHEET.READ: EOF", file=self.logfile)
+                eof_found = 1
+                break
+            elif rc == XL_OBJ:
+                # handle SHEET-level objects; note there's a separate Book.handle_obj
+                saved_obj = self.handle_obj(data)
+                if saved_obj: saved_obj_id = saved_obj.id
+                else: saved_obj_id = None
+            elif rc == XL_MSO_DRAWING:
+                self.handle_msodrawingetc(rc, data_len, data)
+            elif rc == XL_TXO:
+                txo = self.handle_txo(data)
+                if txo and saved_obj_id:
+                    txos[saved_obj_id] = txo
+                    saved_obj_id = None
+            elif rc == XL_NOTE:
+                self.handle_note(data, txos)
+            elif rc == XL_FEAT11:
+                self.handle_feat11(data)
+            elif rc in bofcodes: ##### EMBEDDED BOF #####
+                version, boftype = local_unpack('<HH', data[0:4])
+                if boftype != 0x20: # embedded chart
+                    print("*** Unexpected embedded BOF (0x%04x) at offset %d: version=0x%04x type=0x%04x"
+                        % (rc, bk._position - data_len - 4, version, boftype), file=self.logfile)
+                while 1:
+                    code, data_len, data = bk.get_record_parts()
+                    if code == XL_EOF:
+                        break
+                if DEBUG: print("---> found EOF", file=self.logfile)
+            elif rc == XL_COUNTRY:
+                bk.handle_country(data)
+            elif rc == XL_LABELRANGES:
+                pos = 0
+                pos = unpack_cell_range_address_list_update_pos(
+                    self.row_label_ranges, data, pos, bv, addr_size=8,
+                )
+                pos = unpack_cell_range_address_list_update_pos(
+                    self.col_label_ranges, data, pos, bv, addr_size=8,
+                )
+                assert pos == data_len
+            elif rc == XL_ARRAY:
+                row1x, rownx, col1x, colnx, array_flags, tokslen = \
+                    local_unpack("<HHBBBxxxxxH", data[:14])
+                if blah_formulas:
+                    print("ARRAY:", row1x, rownx, col1x, colnx, array_flags, file=self.logfile)
+                    # dump_formula(bk, data[14:], tokslen, bv, reldelta=0, blah=1)
+            elif rc == XL_SHRFMLA:
+                row1x, rownx, col1x, colnx, nfmlas, tokslen = \
+                    local_unpack("<HHBBxBH", data[:10])
+                if blah_formulas:
+                    print("SHRFMLA (main):", row1x, rownx, col1x, colnx, nfmlas, file=self.logfile)
+                    decompile_formula(bk, data[10:], tokslen, FMLA_TYPE_SHARED,
+                        blah=1, browx=rowx, bcolx=colx, r1c1=r1c1)
+            elif rc == XL_CONDFMT:
+                if not fmt_info: continue
+                assert bv >= 80
+                num_CFs, needs_recalc, browx1, browx2, bcolx1, bcolx2 = \
+                    unpack("<6H", data[0:12])
+                if self.verbosity >= 1:
+                    fprintf(
+                        self.logfile,
+                        "\n*** WARNING: Ignoring CONDFMT (conditional formatting) record\n"
+                        "*** in Sheet %d (%r).\n"
+                        "*** %d CF record(s); needs_recalc_or_redraw = %d\n"
+                        "*** Bounding box is %s\n",
+                        self.number, self.name, num_CFs, needs_recalc,
+                        rangename2d(browx1, browx2+1, bcolx1, bcolx2+1),
+                    )
+                olist = [] # updated by the function
+                pos = unpack_cell_range_address_list_update_pos(
+                    olist, data, 12, bv, addr_size=8)
+                # print >> self.logfile, repr(result), len(result)
+                if self.verbosity >= 1:
+                    fprintf(
+                        self.logfile,
+                        "*** %d individual range(s):\n"
+                        "*** %s\n",
+                        len(olist),
+                        ", ".join(rangename2d(*coords) for coords in olist),
+                    )
+            elif rc == XL_CF:
+                if not fmt_info: continue
+                cf_type, cmp_op, sz1, sz2, flags = unpack("<BBHHi", data[0:10])
+                font_block = (flags >> 26) & 1
+                bord_block = (flags >> 28) & 1
+                patt_block = (flags >> 29) & 1
+                if self.verbosity >= 1:
+                    fprintf(
+                        self.logfile,
+                        "\n*** WARNING: Ignoring CF (conditional formatting) sub-record.\n"
+                        "*** cf_type=%d, cmp_op=%d, sz1=%d, sz2=%d, flags=0x%08x\n"
+                        "*** optional data blocks: font=%d, border=%d, pattern=%d\n",
+                        cf_type, cmp_op, sz1, sz2, flags,
+                        font_block, bord_block, patt_block,
+                    )
+                # hex_char_dump(data, 0, data_len, fout=self.logfile)
+                pos = 12
+                if font_block:
+                    (font_height, font_options, weight, escapement, underline,
+                     font_colour_index, two_bits, font_esc, font_underl) = unpack("<64x i i H H B 3x i 4x i i i 18x", data[pos:pos+118])
+                    font_style = (two_bits > 1) & 1
+                    posture = (font_options > 1) & 1
+                    font_canc = (two_bits > 7) & 1
+                    cancellation = (font_options > 7) & 1
+                    if self.verbosity >= 1:
+                        fprintf(
+                            self.logfile,
+                            "*** Font info: height=%d, weight=%d, escapement=%d,\n"
+                            "*** underline=%d, colour_index=%d, esc=%d, underl=%d,\n"
+                            "*** style=%d, posture=%d, canc=%d, cancellation=%d\n",
+                            font_height, weight, escapement, underline,
+                            font_colour_index, font_esc, font_underl,
+                            font_style, posture, font_canc, cancellation,
+                        )
+                    pos += 118
+                if bord_block:
+                    pos += 8
+                if patt_block:
+                    pos += 4
+                fmla1 = data[pos:pos+sz1]
+                pos += sz1
+                if blah and sz1:
+                    fprintf(self.logfile, "*** formula 1:\n")
+                    dump_formula(bk, fmla1, sz1, bv, reldelta=0, blah=1)
+                fmla2 = data[pos:pos+sz2]
+                pos += sz2
+                assert pos == data_len
+                if blah and sz2:
+                    fprintf(self.logfile, "*** formula 2:\n")
+                    dump_formula(bk, fmla2, sz2, bv, reldelta=0, blah=1)
+            elif rc == XL_DEFAULTROWHEIGHT:
+                if data_len == 4:
+                    bits, self.default_row_height = unpack("<HH", data[:4])
+                elif data_len == 2:
+                    self.default_row_height, = unpack("<H", data)
+                    bits = 0
+                    fprintf(self.logfile,
+                        "*** WARNING: DEFAULTROWHEIGHT record len is 2, "
+                        "should be 4; assuming BIFF2 format\n")
+                else:
+                    bits = 0
+                    fprintf(self.logfile,
+                        "*** WARNING: DEFAULTROWHEIGHT record len is %d, "
+                        "should be 4; ignoring this record\n",
+                        data_len)
+                self.default_row_height_mismatch = bits & 1
+                self.default_row_hidden = (bits >> 1) & 1
+                self.default_additional_space_above = (bits >> 2) & 1
+                self.default_additional_space_below = (bits >> 3) & 1
+            elif rc == XL_MERGEDCELLS:
+                if not fmt_info: continue
+                pos = unpack_cell_range_address_list_update_pos(
+                    self.merged_cells, data, 0, bv, addr_size=8)
+                if blah:
+                    fprintf(self.logfile,
+                        "MERGEDCELLS: %d ranges\n", (pos - 2) // 8)
+                assert pos == data_len, \
+                    "MERGEDCELLS: pos=%d data_len=%d" % (pos, data_len)
+            elif rc == XL_WINDOW2:
+                if bv >= 80 and data_len >= 14:
+                    (
+                        options,
+                        self.first_visible_rowx, self.first_visible_colx,
+                        self.gridline_colour_index,
+                        self.cached_page_break_preview_mag_factor,
+                        self.cached_normal_view_mag_factor
+                    ) = unpack("<HHHHxxHH", data[:14])
+                else:
+                    assert bv >= 30 # BIFF3-7
+                    (
+                        options,
+                        self.first_visible_rowx, self.first_visible_colx,
+                    ) = unpack("<HHH", data[:6])
+                    self.gridline_colour_rgb = unpack("<BBB", data[6:9])
+                    self.gridline_colour_index = nearest_colour_index(
+                        self.book.colour_map, self.gridline_colour_rgb, debug=0)
+                # options -- Bit, Mask, Contents:
+                # 0 0001H 0 = Show formula results 1 = Show formulas
+                # 1 0002H 0 = Do not show grid lines 1 = Show grid lines
+                # 2 0004H 0 = Do not show sheet headers 1 = Show sheet headers
+                # 3 0008H 0 = Panes are not frozen 1 = Panes are frozen (freeze)
+                # 4 0010H 0 = Show zero values as empty cells 1 = Show zero values
+                # 5 0020H 0 = Manual grid line colour 1 = Automatic grid line colour
+                # 6 0040H 0 = Columns from left to right 1 = Columns from right to left
+                # 7 0080H 0 = Do not show outline symbols 1 = Show outline symbols
+                # 8 0100H 0 = Keep splits if pane freeze is removed 1 = Remove splits if pane freeze is removed
+                # 9 0200H 0 = Sheet not selected 1 = Sheet selected (BIFF5-BIFF8)
+                # 10 0400H 0 = Sheet not visible 1 = Sheet visible (BIFF5-BIFF8)
+                # 11 0800H 0 = Show in normal view 1 = Show in page break preview (BIFF8)
+                # The freeze flag specifies, if a following PANE record (6.71) describes unfrozen or frozen panes.
+                for attr, _unused_defval in _WINDOW2_options:
+                    setattr(self, attr, options & 1)
+                    options >>= 1
+            elif rc == XL_SCL:
+                num, den = unpack("<HH", data)
+                result = 0
+                if den:
+                    result = (num * 100) // den
+                if not(10 <= result <= 400):
+                    if DEBUG or self.verbosity >= 0:
+                        print(
+                            "WARNING *** SCL rcd sheet %d: should have 0.1 <= num/den <= 4; got %d/%d"
+                            % (self.number, num, den),
+                            file=self.logfile,
+                        )
+                    result = 100
+                self.scl_mag_factor = result
+            elif rc == XL_PANE:
+                (
+                    self.vert_split_pos,
+                    self.horz_split_pos,
+                    self.horz_split_first_visible,
+                    self.vert_split_first_visible,
+                    self.split_active_pane,
+                ) = unpack("<HHHHB", data[:9])
+                self.has_pane_record = 1
+            elif rc == XL_HORIZONTALPAGEBREAKS:
+                if not fmt_info: continue
+                num_breaks, = local_unpack("<H", data[:2])
+                assert num_breaks * (2 + 4 * (bv >= 80)) + 2 == data_len
+                pos = 2
+                if bv < 80:
+                    while pos < data_len:
+                        self.horizontal_page_breaks.append((local_unpack("<H", data[pos:pos+2])[0], 0, 255))
+                        pos += 2
+                else:
+                    while pos < data_len:
+                        self.horizontal_page_breaks.append(local_unpack("<HHH", data[pos:pos+6]))
+                        pos += 6
+            elif rc == XL_VERTICALPAGEBREAKS:
+                if not fmt_info: continue
+                num_breaks, = local_unpack("<H", data[:2])
+                assert num_breaks * (2 + 4 * (bv >= 80)) + 2 == data_len
+                pos = 2
+                if bv < 80:
+                    while pos < data_len:
+                        self.vertical_page_breaks.append((local_unpack("<H", data[pos:pos+2])[0], 0, 65535))
+                        pos += 2
+                else:
+                    while pos < data_len:
+                        self.vertical_page_breaks.append(local_unpack("<HHH", data[pos:pos+6]))
+                        pos += 6
+            #### all of the following are for BIFF <= 4W
+            elif bv <= 45:
+                if rc == XL_FORMAT or rc == XL_FORMAT2:
+                    bk.handle_format(data, rc)
+                elif rc == XL_FONT or rc == XL_FONT_B3B4:
+                    bk.handle_font(data)
+                elif rc == XL_STYLE:
+                    if not self.book._xf_epilogue_done:
+                        self.book.xf_epilogue()
+                    bk.handle_style(data)
+                elif rc == XL_PALETTE:
+                    bk.handle_palette(data)
+                elif rc == XL_BUILTINFMTCOUNT:
+                    bk.handle_builtinfmtcount(data)
+                elif rc == XL_XF4 or rc == XL_XF3 or rc == XL_XF2: #### N.B. not XL_XF
+                    bk.handle_xf(data)
+                elif rc == XL_DATEMODE:
+                    bk.handle_datemode(data)
+                elif rc == XL_CODEPAGE:
+                    bk.handle_codepage(data)
+                elif rc == XL_FILEPASS:
+                    bk.handle_filepass(data)
+                elif rc == XL_WRITEACCESS:
+                    bk.handle_writeaccess(data)
+                elif rc == XL_IXFE:
+                    self._ixfe = local_unpack('<H', data)[0]
+                elif rc == XL_NUMBER_B2:
+                    rowx, colx, cell_attr, d = local_unpack('<HH3sd', data)
+                    self_put_cell(rowx, colx, None, d, self.fixed_BIFF2_xfindex(cell_attr, rowx, colx))
+                elif rc == XL_INTEGER:
+                    rowx, colx, cell_attr, d = local_unpack('<HH3sH', data)
+                    self_put_cell(rowx, colx, None, float(d), self.fixed_BIFF2_xfindex(cell_attr, rowx, colx))
+                elif rc == XL_LABEL_B2:
+                    rowx, colx, cell_attr = local_unpack('<HH3s', data[0:7])
+                    strg = unpack_string(data, 7, bk.encoding or bk.derive_encoding(), lenlen=1)
+                    self_put_cell(rowx, colx, XL_CELL_TEXT, strg, self.fixed_BIFF2_xfindex(cell_attr, rowx, colx))
+                elif rc == XL_BOOLERR_B2:
+                    rowx, colx, cell_attr, value, is_err = local_unpack('<HH3sBB', data)
+                    cellty = (XL_CELL_BOOLEAN, XL_CELL_ERROR)[is_err]
+                    # if DEBUG: print "XL_BOOLERR_B2", rowx, colx, cell_attr, value, is_err
+                    self_put_cell(rowx, colx, cellty, value, self.fixed_BIFF2_xfindex(cell_attr, rowx, colx))
+                elif rc == XL_BLANK_B2:
+                    if not fmt_info: continue
+                    rowx, colx, cell_attr = local_unpack('<HH3s', data[:7])
+                    self_put_cell(rowx, colx, XL_CELL_BLANK, '', self.fixed_BIFF2_xfindex(cell_attr, rowx, colx))
+                elif rc == XL_EFONT:
+                    bk.handle_efont(data)
+                elif rc == XL_ROW_B2:
+                    if not fmt_info: continue
+                    rowx, bits1, bits2 = local_unpack('<H4xH2xB', data[0:11])
+                    if not(0 <= rowx < self.utter_max_rows):
+                        print("*** NOTE: ROW_B2 record has row index %d; "
+                            "should have 0 <= rowx < %d -- record ignored!"
+                            % (rowx, self.utter_max_rows), file=self.logfile)
+                        continue
+                    if not (bits2 & 1):  # has_default_xf_index is false
+                        xf_index = -1
+                    elif data_len == 18:
+                        # Seems the XF index in the cell_attr is dodgy
+                        xfx = local_unpack('<H', data[16:18])[0]
+                        xf_index = self.fixed_BIFF2_xfindex(cell_attr=None, rowx=rowx, colx=-1, true_xfx=xfx)
+                    else:
+                        cell_attr = data[13:16]
+                        xf_index = self.fixed_BIFF2_xfindex(cell_attr, rowx, colx=-1)
+                    key = (bits1, bits2, xf_index)
+                    r = rowinfo_sharing_dict.get(key)
+                    if r is None:
+                        rowinfo_sharing_dict[key] = r = Rowinfo()
+                        r.height = bits1 & 0x7fff
+                        r.has_default_height = (bits1 >> 15) & 1
+                        r.has_default_xf_index = bits2 & 1
+                        r.xf_index = xf_index
+                        # r.outline_level = 0             # set in __init__
+                        # r.outline_group_starts_ends = 0 # set in __init__
+                        # r.hidden = 0                    # set in __init__
+                        # r.height_mismatch = 0           # set in __init__
+                        # r.additional_space_above = 0    # set in __init__
+                        # r.additional_space_below = 0    # set in __init__
+                    self.rowinfo_map[rowx] = r
+                    if 0 and r.xf_index > -1:
+                        fprintf(self.logfile,
+                            "**ROW %d %d %d\n",
+                            self.number, rowx, r.xf_index)
+                    if blah_rows:
+                        print('ROW_B2', rowx, bits1, file=self.logfile)
+                        r.dump(self.logfile,
+                            header="--- sh #%d, rowx=%d ---" % (self.number, rowx))
+                elif rc == XL_COLWIDTH: # BIFF2 only
+                    if not fmt_info: continue
+                    first_colx, last_colx, width\
+                        = local_unpack("<BBH", data[:4])
+                    if not(first_colx <= last_colx):
+                        print("*** NOTE: COLWIDTH record has first col index %d, last %d; "
+                            "should have first <= last -- record ignored!"
+                            % (first_colx, last_colx), file=self.logfile)
+                        continue
+                    for colx in xrange(first_colx, last_colx+1):
+                        if colx in self.colinfo_map:
+                            c = self.colinfo_map[colx]
+                        else:
+                            c = Colinfo()
+                            self.colinfo_map[colx] = c
+                        c.width = width
+                    if blah:
+                        fprintf(
+                            self.logfile,
+                            "COLWIDTH sheet #%d cols %d-%d: wid=%d\n",
+                            self.number, first_colx, last_colx, width,
+                        )
+                elif rc == XL_COLUMNDEFAULT: # BIFF2 only
+                    if not fmt_info: continue
+                    first_colx, last_colx = local_unpack("<HH", data[:4])
+                    #### Warning OOo docs wrong; first_colx <= colx < last_colx
+                    if blah:
+                        fprintf(
+                            self.logfile,
+                            "COLUMNDEFAULT sheet #%d cols in range(%d, %d)\n",
+                            self.number, first_colx, last_colx,
+                        )
+                    if not(0 <= first_colx < last_colx <= 256):
+                        print("*** NOTE: COLUMNDEFAULT record has first col index %d, last %d; "
+                            "should have 0 <= first < last <= 256"
+                            % (first_colx, last_colx), file=self.logfile)
+                        last_colx = min(last_colx, 256)
+                    for colx in xrange(first_colx, last_colx):
+                        offset = 4 + 3 * (colx - first_colx)
+                        cell_attr = data[offset:offset+3]
+                        xf_index = self.fixed_BIFF2_xfindex(cell_attr, rowx=-1, colx=colx)
+                        if colx in self.colinfo_map:
+                            c = self.colinfo_map[colx]
+                        else:
+                            c = Colinfo()
+                            self.colinfo_map[colx] = c
+                        c.xf_index = xf_index
+                elif rc == XL_WINDOW2_B2: # BIFF 2 only
+                    attr_names = ("show_formulas", "show_grid_lines", "show_sheet_headers",
+                        "panes_are_frozen", "show_zero_values")
+                    for attr, char in zip(attr_names, data[0:5]):
+                        setattr(self, attr, int(char != b'\0'))
+                    (
+                        self.first_visible_rowx, self.first_visible_colx,
+                        self.automatic_grid_line_colour,
+                    ) = unpack("<HHB", data[5:10])
+                    self.gridline_colour_rgb = unpack("<BBB", data[10:13])
+                    self.gridline_colour_index = nearest_colour_index(
+                        self.book.colour_map, self.gridline_colour_rgb, debug=0)
+            else:
+                # if DEBUG: print "SHEET.READ: Unhandled record type %02x %d bytes %r" % (rc, data_len, data)
+                pass
+        if not eof_found:
+            raise XLRDError("Sheet %d (%r) missing EOF record"
+                % (self.number, self.name))
+        self.tidy_dimensions()
+        self.update_cooked_mag_factors()
+        bk._position = oldpos
+        return 1
+
+    def string_record_contents(self, data):
+        bv = self.biff_version
+        bk = self.book
+        lenlen = (bv >= 30) + 1
+        nchars_expected = unpack("<" + "BH"[lenlen - 1], data[:lenlen])[0]
+        offset = lenlen
+        if bv < 80:
+            enc = bk.encoding or bk.derive_encoding()
+        nchars_found = 0
+        result = UNICODE_LITERAL("")
+        while 1:
+            if bv >= 80:
+                flag = BYTES_ORD(data[offset]) & 1
+                enc = ("latin_1", "utf_16_le")[flag]
+                offset += 1
+            chunk = unicode(data[offset:], enc)
+            result += chunk
+            nchars_found += len(chunk)
+            if nchars_found == nchars_expected:
+                return result
+            if nchars_found > nchars_expected:
+                msg = ("STRING/CONTINUE: expected %d chars, found %d"
+                    % (nchars_expected, nchars_found))
+                raise XLRDError(msg)
+            rc, _unused_len, data = bk.get_record_parts()
+            if rc != XL_CONTINUE:
+                raise XLRDError(
+                    "Expected CONTINUE record; found record-type 0x%04X" % rc)
+            offset = 0
+
+    def update_cooked_mag_factors(self):
+        # Cached values are used ONLY for the non-active view mode.
+        # When the user switches to the non-active view mode,
+        # if the cached value for that mode is not valid,
+        # Excel pops up a window which says:
+        # "The number must be between 10 and 400. Try again by entering a number in this range."
+        # When the user hits OK, it drops into the non-active view mode
+        # but uses the magn from the active mode.
+        # NOTE: definition of "valid" depends on mode ... see below
+        blah = DEBUG or self.verbosity > 0
+        if self.show_in_page_break_preview:
+            if self.scl_mag_factor is None: # no SCL record
+                self.cooked_page_break_preview_mag_factor = 100 # Yes, 100, not 60, NOT a typo
+            else:
+                self.cooked_page_break_preview_mag_factor = self.scl_mag_factor
+            zoom = self.cached_normal_view_mag_factor
+            if not (10 <= zoom <=400):
+                if blah:
+                    print(
+                        "WARNING *** WINDOW2 rcd sheet %d: Bad cached_normal_view_mag_factor: %d"
+                        % (self.number, self.cached_normal_view_mag_factor),
+                        file=self.logfile,
+                    )
+                zoom = self.cooked_page_break_preview_mag_factor
+            self.cooked_normal_view_mag_factor = zoom
+        else:
+            # normal view mode
+            if self.scl_mag_factor is None: # no SCL record
+                self.cooked_normal_view_mag_factor = 100
+            else:
+                self.cooked_normal_view_mag_factor = self.scl_mag_factor
+            zoom = self.cached_page_break_preview_mag_factor
+            if not zoom:
+                # VALID, defaults to 60
+                zoom = 60
+            elif not (10 <= zoom <= 400):
+                if blah:
+                    print(
+                        "WARNING *** WINDOW2 rcd sheet %r: Bad cached_page_break_preview_mag_factor: %r"
+                        % (self.number, self.cached_page_break_preview_mag_factor),
+                        file=self.logfile,
+                    )
+                zoom = self.cooked_normal_view_mag_factor
+            self.cooked_page_break_preview_mag_factor = zoom
+
+    def fixed_BIFF2_xfindex(self, cell_attr, rowx, colx, true_xfx=None):
+        DEBUG = 0
+        blah = DEBUG or self.verbosity >= 2
+        if self.biff_version == 21:
+            if self.book.xf_list:
+                if true_xfx is not None:
+                    xfx = true_xfx
+                else:
+                    xfx = BYTES_ORD(cell_attr[0]) & 0x3F
+                if xfx == 0x3F:
+                    if self._ixfe is None:
+                        raise XLRDError("BIFF2 cell record has XF index 63 but no preceding IXFE record.")
+                    xfx = self._ixfe
+                    # OOo docs are capable of interpretation that each
+                    # cell record is preceded immediately by its own IXFE record.
+                    # Empirical evidence is that (sensibly) an IXFE record applies to all
+                    # following cell records until another IXFE comes along.
+                return xfx
+            # Have either Excel 2.0, or broken 2.1 w/o XF records -- same effect.
+            self.biff_version = self.book.biff_version = 20
+        #### check that XF slot in cell_attr is zero
+        xfx_slot = BYTES_ORD(cell_attr[0]) & 0x3F
+        assert xfx_slot == 0
+        xfx = self._cell_attr_to_xfx.get(cell_attr)
+        if xfx is not None:
+            return xfx
+        if blah:
+            fprintf(self.logfile, "New cell_attr %r at (%r, %r)\n", cell_attr, rowx, colx)
+        if not self.book.xf_list:
+            for xfx in xrange(16):
+                self.insert_new_BIFF20_xf(cell_attr=b"\x40\x00\x00", style=xfx < 15)
+        xfx = self.insert_new_BIFF20_xf(cell_attr=cell_attr)
+        return xfx
+
+    def insert_new_BIFF20_xf(self, cell_attr, style=0):
+        DEBUG = 0
+        blah = DEBUG or self.verbosity >= 2
+        book = self.book
+        xfx = len(book.xf_list)
+        xf = self.fake_XF_from_BIFF20_cell_attr(cell_attr, style)
+        xf.xf_index = xfx
+        book.xf_list.append(xf)
+        if blah:
+            xf.dump(self.logfile, header="=== Faked XF %d ===" % xfx, footer="======")
+        if xf.format_key not in book.format_map:
+            if xf.format_key:
+                msg = "ERROR *** XF[%d] unknown format key (%d, 0x%04x)\n"
+                fprintf(self.logfile, msg,
+                        xf.xf_index, xf.format_key, xf.format_key)
+            fmt = Format(xf.format_key, FUN, UNICODE_LITERAL("General"))
+            book.format_map[xf.format_key] = fmt
+            book.format_list.append(fmt)
+        cellty_from_fmtty = {
+            FNU: XL_CELL_NUMBER,
+            FUN: XL_CELL_NUMBER,
+            FGE: XL_CELL_NUMBER,
+            FDT: XL_CELL_DATE,
+            FTX: XL_CELL_NUMBER, # Yes, a number can be formatted as text.
+        }
+        fmt = book.format_map[xf.format_key]
+        cellty = cellty_from_fmtty[fmt.type]
+        self._xf_index_to_xl_type_map[xf.xf_index] = cellty
+        self._cell_attr_to_xfx[cell_attr] = xfx
+        return xfx
+
+    def fake_XF_from_BIFF20_cell_attr(self, cell_attr, style=0):
+        from .formatting import XF, XFAlignment, XFBorder, XFBackground, XFProtection
+        xf = XF()
+        xf.alignment = XFAlignment()
+        xf.alignment.indent_level = 0
+        xf.alignment.shrink_to_fit = 0
+        xf.alignment.text_direction = 0
+        xf.border = XFBorder()
+        xf.border.diag_up = 0
+        xf.border.diag_down = 0
+        xf.border.diag_colour_index = 0
+        xf.border.diag_line_style = 0 # no line
+        xf.background = XFBackground()
+        xf.protection = XFProtection()
+        (prot_bits, font_and_format, halign_etc) = unpack('<BBB', cell_attr)
+        xf.format_key = font_and_format & 0x3F
+        xf.font_index = (font_and_format & 0xC0) >> 6
+        upkbits(xf.protection, prot_bits, (
+            (6, 0x40, 'cell_locked'),
+            (7, 0x80, 'formula_hidden'),
+        ))
+        xf.alignment.hor_align = halign_etc & 0x07
+        for mask, side in ((0x08, 'left'), (0x10, 'right'), (0x20, 'top'), (0x40, 'bottom')):
+            if halign_etc & mask:
+                colour_index, line_style = 8, 1 # black, thin
+            else:
+                colour_index, line_style = 0, 0 # none, none
+            setattr(xf.border, side + '_colour_index', colour_index)
+            setattr(xf.border, side + '_line_style', line_style)
+        bg = xf.background
+        if halign_etc & 0x80:
+            bg.fill_pattern = 17
+        else:
+            bg.fill_pattern = 0
+        bg.background_colour_index = 9 # white
+        bg.pattern_colour_index = 8 # black
+        xf.parent_style_index = (0x0FFF, 0)[style]
+        xf.alignment.vert_align = 2 # bottom
+        xf.alignment.rotation = 0
+        attr_stems = [
+            'format',
+            'font',
+            'alignment',
+            'border',
+            'background',
+            'protection',
+        ]
+        for attr_stem in attr_stems:
+            attr = "_" + attr_stem + "_flag"
+            setattr(xf, attr, 1)
+        return xf
+
+    def req_fmt_info(self):
+        if not self.formatting_info:
+            raise XLRDError("Feature requires open_workbook(..., formatting_info=True)")
+
+    def computed_column_width(self, colx):
+        """
+        Determine column display width.
+
+        :param colx:
+          Index of the queried column, range 0 to 255.
+          Note that it is possible to find out the width that will be used to
+          display columns with no cell information e.g. column IV (colx=255).
+
+        :return:
+          The column width that will be used for displaying
+          the given column by Excel, in units of 1/256th of the width of a
+          standard character (the digit zero in the first font).
+
+        .. versionadded:: 0.6.1
+        """
+        self.req_fmt_info()
+        if self.biff_version >= 80:
+            colinfo = self.colinfo_map.get(colx, None)
+            if colinfo is not None:
+                return colinfo.width
+            if self.standardwidth is not None:
+                return self.standardwidth
+        elif self.biff_version >= 40:
+            if self.gcw[colx]:
+                if self.standardwidth is not None:
+                    return self.standardwidth
+            else:
+                colinfo = self.colinfo_map.get(colx, None)
+                if colinfo is not None:
+                    return colinfo.width
+        elif self.biff_version == 30:
+            colinfo = self.colinfo_map.get(colx, None)
+            if colinfo is not None:
+                return colinfo.width
+        # All roads lead to Rome and the DEFCOLWIDTH ...
+        if self.defcolwidth is not None:
+            return self.defcolwidth * 256
+        return 8 * 256 # 8 is what Excel puts in a DEFCOLWIDTH record
+
+    def handle_hlink(self, data):
+        # DEBUG = 1
+        if DEBUG: print("\n=== hyperlink ===", file=self.logfile)
+        record_size = len(data)
+        h = Hyperlink()
+        h.frowx, h.lrowx, h.fcolx, h.lcolx, guid0, dummy, options = unpack('<HHHH16s4si', data[:32])
+        assert guid0 == b"\xD0\xC9\xEA\x79\xF9\xBA\xCE\x11\x8C\x82\x00\xAA\x00\x4B\xA9\x0B"
+        assert dummy == b"\x02\x00\x00\x00"
+        if DEBUG: print("options: %08X" % options, file=self.logfile)
+        offset = 32
+
+        def get_nul_terminated_unicode(buf, ofs):
+            nb = unpack('<L', buf[ofs:ofs+4])[0] * 2
+            ofs += 4
+            uc = unicode(buf[ofs:ofs+nb], 'UTF-16le')[:-1]
+            ofs += nb
+            return uc, ofs
+
+        if options & 0x14: # has a description
+            h.desc, offset = get_nul_terminated_unicode(data, offset)
+
+        if options & 0x80: # has a target
+            h.target, offset = get_nul_terminated_unicode(data, offset)
+
+        if (options & 1) and not (options & 0x100): # HasMoniker and not MonikerSavedAsString
+            # an OLEMoniker structure
+            clsid, = unpack('<16s', data[offset:offset + 16])
+            if DEBUG: fprintf(self.logfile, "clsid=%r\n",  clsid)
+            offset += 16
+            if clsid == b"\xE0\xC9\xEA\x79\xF9\xBA\xCE\x11\x8C\x82\x00\xAA\x00\x4B\xA9\x0B":
+                #          E0H C9H EAH 79H F9H BAH CEH 11H 8CH 82H 00H AAH 00H 4BH A9H 0BH
+                # URL Moniker
+                h.type = UNICODE_LITERAL('url')
+                nbytes = unpack('<L', data[offset:offset + 4])[0]
+                offset += 4
+                h.url_or_path = unicode(data[offset:offset + nbytes], 'UTF-16le')
+                if DEBUG: fprintf(self.logfile, "initial url=%r len=%d\n", h.url_or_path, len(h.url_or_path))
+                endpos = h.url_or_path.find('\x00')
+                if DEBUG: print("endpos=%d" % endpos, file=self.logfile)
+                h.url_or_path = h.url_or_path[:endpos]
+                true_nbytes = 2 * (endpos + 1)
+                offset += true_nbytes
+                extra_nbytes = nbytes - true_nbytes
+                extra_data = data[offset:offset + extra_nbytes]
+                offset += extra_nbytes
+                if DEBUG:
+                    fprintf(
+                        self.logfile,
+                        "url=%r\nextra=%r\nnbytes=%d true_nbytes=%d extra_nbytes=%d\n",
+                        h.url_or_path, extra_data, nbytes, true_nbytes, extra_nbytes,
+                    )
+                assert extra_nbytes in (24, 0)
+            elif clsid == b"\x03\x03\x00\x00\x00\x00\x00\x00\xC0\x00\x00\x00\x00\x00\x00\x46":
+                # file moniker
+                h.type = UNICODE_LITERAL('local file')
+                uplevels, nbytes = unpack("<Hi", data[offset:offset + 6])
+                offset += 6
+                shortpath = b"..\\" * uplevels + data[offset:offset + nbytes - 1] #### BYTES, not unicode
+                if DEBUG: fprintf(self.logfile, "uplevels=%d shortpath=%r\n", uplevels, shortpath)
+                offset += nbytes
+                offset += 24 # OOo: "unknown byte sequence"
+                # above is version 0xDEAD + 20 reserved zero bytes
+                sz = unpack('<i', data[offset:offset + 4])[0]
+                if DEBUG: print("sz=%d" % sz, file=self.logfile)
+                offset += 4
+                if sz:
+                    xl = unpack('<i', data[offset:offset + 4])[0]
+                    offset += 4
+                    offset += 2 # "unknown byte sequence" MS: 0x0003
+                    extended_path = unicode(data[offset:offset + xl], 'UTF-16le') # not zero-terminated
+                    offset += xl
+                    h.url_or_path = extended_path
+                else:
+                    h.url_or_path = shortpath
+                    #### MS KLUDGE WARNING ####
+                    # The "shortpath" is bytes encoded in the **UNKNOWN** creator's "ANSI" encoding.
+            else:
+                fprintf(self.logfile, "*** unknown clsid %r\n", clsid)
+        elif options & 0x163 == 0x103: # UNC
+            h.type = UNICODE_LITERAL('unc')
+            h.url_or_path, offset = get_nul_terminated_unicode(data, offset)
+        elif options & 0x16B == 8:
+            h.type = UNICODE_LITERAL('workbook')
+        else:
+            h.type = UNICODE_LITERAL('unknown')
+
+        if options & 0x8: # has textmark
+            h.textmark, offset = get_nul_terminated_unicode(data, offset)
+
+        if DEBUG:
+            h.dump(header="... object dump ...")
+            print("offset=%d record_size=%d" % (offset, record_size))
+
+        extra_nbytes = record_size - offset
+        if extra_nbytes > 0:
+            fprintf(
+                self.logfile,
+                "*** WARNING: hyperlink at R%dC%d has %d extra data bytes: %s\n",
+                h.frowx + 1,
+                h.fcolx + 1,
+                extra_nbytes,
+                REPR(data[-extra_nbytes:]),
+            )
+            # Seen: b"\x00\x00" also b"A\x00", b"V\x00"
+        elif extra_nbytes < 0:
+            raise XLRDError("Bug or corrupt file, send copy of input file for debugging")
+
+        self.hyperlink_list.append(h)
+        for rowx in xrange(h.frowx, h.lrowx+1):
+            for colx in xrange(h.fcolx, h.lcolx+1):
+                self.hyperlink_map[rowx, colx] = h
+
+    def handle_quicktip(self, data):
+        rcx, frowx, lrowx, fcolx, lcolx = unpack('<5H', data[:10])
+        assert rcx == XL_QUICKTIP
+        assert self.hyperlink_list
+        h = self.hyperlink_list[-1]
+        assert (frowx, lrowx, fcolx, lcolx) == (h.frowx, h.lrowx, h.fcolx, h.lcolx)
+        assert data[-2:] == b'\x00\x00'
+        h.quicktip = unicode(data[10:-2], 'utf_16_le')
+
+    def handle_msodrawingetc(self, recid, data_len, data):
+        if not OBJ_MSO_DEBUG:
+            return
+        DEBUG = 1
+        if self.biff_version < 80:
+            return
+        o = MSODrawing()
+        pos = 0
+        while pos < data_len:
+            tmp, fbt, cb = unpack('<HHI', data[pos:pos+8])
+            ver = tmp & 0xF
+            inst = (tmp >> 4) & 0xFFF
+            if ver == 0xF:
+                ndb = 0 # container
+            else:
+                ndb = cb
+            if DEBUG:
+                hex_char_dump(data, pos, ndb + 8, base=0, fout=self.logfile)
+                fprintf(self.logfile,
+                    "fbt:0x%04X  inst:%d  ver:0x%X  cb:%d (0x%04X)\n",
+                    fbt, inst, ver, cb, cb)
+            if fbt == 0xF010: # Client Anchor
+                assert ndb == 18
+                (o.anchor_unk,
+                o.anchor_colx_lo, o.anchor_rowx_lo,
+                o.anchor_colx_hi, o.anchor_rowx_hi) = unpack('<Hiiii', data[pos+8:pos+8+ndb])
+            elif fbt == 0xF011: # Client Data
+                # must be followed by an OBJ record
+                assert cb == 0
+                assert pos + 8 == data_len
+            else:
+                pass
+            pos += ndb + 8
+        else:
+            # didn't break out of while loop
+            assert pos == data_len
+        if DEBUG:
+            o.dump(self.logfile, header="=== MSODrawing ===", footer= " ")
+
+
+    def handle_obj(self, data):
+        if self.biff_version < 80:
+            return None
+        o = MSObj()
+        data_len = len(data)
+        pos = 0
+        if OBJ_MSO_DEBUG:
+            fprintf(self.logfile, "... OBJ record len=%d...\n", data_len)
+        while pos < data_len:
+            ft, cb = unpack('<HH', data[pos:pos+4])
+            if OBJ_MSO_DEBUG:
+                fprintf(self.logfile, "pos=%d ft=0x%04X cb=%d\n", pos, ft, cb)
+                hex_char_dump(data, pos, cb + 4, base=0, fout=self.logfile)
+            if pos == 0 and not (ft == 0x15 and cb == 18):
+                if self.verbosity:
+                    fprintf(self.logfile, "*** WARNING Ignoring antique or corrupt OBJECT record\n")
+                return None
+            if ft == 0x15: # ftCmo ... s/b first
+                assert pos == 0
+                o.type, o.id, option_flags = unpack('<HHH', data[pos+4:pos+10])
+                upkbits(o, option_flags, (
+                    ( 0, 0x0001, 'locked'),
+                    ( 4, 0x0010, 'printable'),
+                    ( 8, 0x0100, 'autofilter'), # not documented in Excel 97 dev kit
+                    ( 9, 0x0200, 'scrollbar_flag'), # not documented in Excel 97 dev kit
+                    (13, 0x2000, 'autofill'),
+                    (14, 0x4000, 'autoline'),
+                ))
+            elif ft == 0x00:
+                if data[pos:data_len] == b'\0' * (data_len - pos):
+                    # ignore "optional reserved" data at end of record
+                    break
+                msg = "Unexpected data at end of OBJECT record"
+                fprintf(self.logfile, "*** ERROR %s\n" % msg)
+                hex_char_dump(data, pos, data_len - pos, base=0, fout=self.logfile)
+                raise XLRDError(msg)
+            elif ft == 0x0C: # Scrollbar
+                values = unpack('<5H', data[pos+8:pos+18])
+                for value, tag in zip(values, ('value', 'min', 'max', 'inc', 'page')):
+                    setattr(o, 'scrollbar_' + tag, value)
+            elif ft == 0x0D: # "Notes structure" [used for cell comments]
+                # not documented in Excel 97 dev kit
+                if OBJ_MSO_DEBUG: fprintf(self.logfile, "*** OBJ record has ft==0x0D 'notes' structure\n")
+            elif ft == 0x13: # list box data
+                if o.autofilter: # non standard exit. NOT documented
+                    break
+            else:
+                pass
+            pos += cb + 4
+        else:
+            # didn't break out of while loop
+            pass
+        if OBJ_MSO_DEBUG:
+            o.dump(self.logfile, header="=== MSOBj ===", footer= " ")
+        return o
+
+    def handle_note(self, data, txos):
+        if OBJ_MSO_DEBUG:
+            fprintf(self.logfile, '... NOTE record ...\n')
+            hex_char_dump(data, 0, len(data), base=0, fout=self.logfile)
+        o = Note()
+        data_len = len(data)
+        if self.biff_version < 80:
+            o.rowx, o.colx, expected_bytes = unpack('<HHH', data[:6])
+            nb = len(data) - 6
+            assert nb <= expected_bytes
+            pieces = [data[6:]]
+            expected_bytes -= nb
+            while expected_bytes > 0:
+                rc2, data2_len, data2 = self.book.get_record_parts()
+                assert rc2 == XL_NOTE
+                dummy_rowx, nb = unpack('<H2xH', data2[:6])
+                assert dummy_rowx == 0xFFFF
+                assert nb == data2_len - 6
+                pieces.append(data2[6:])
+                expected_bytes -= nb
+            assert expected_bytes == 0
+            enc = self.book.encoding or self.book.derive_encoding()
+            o.text = unicode(b''.join(pieces), enc)
+            o.rich_text_runlist = [(0, 0)]
+            o.show = 0
+            o.row_hidden = 0
+            o.col_hidden = 0
+            o.author = UNICODE_LITERAL('')
+            o._object_id = None
+            self.cell_note_map[o.rowx, o.colx] = o
+            return
+        # Excel 8.0+
+        o.rowx, o.colx, option_flags, o._object_id = unpack('<4H', data[:8])
+        o.show = (option_flags >> 1) & 1
+        o.row_hidden = (option_flags >> 7) & 1
+        o.col_hidden = (option_flags >> 8) & 1
+        # XL97 dev kit book says NULL [sic] bytes padding between string count and string data
+        # to ensure that string is word-aligned. Appears to be nonsense.
+        o.author, endpos = unpack_unicode_update_pos(data, 8, lenlen=2)
+        # There is a random/undefined byte after the author string (not counted in the
+        # string length).
+        # Issue 4 on github: Google Spreadsheet doesn't write the undefined byte.
+        assert (data_len - endpos) in (0, 1)
+        if OBJ_MSO_DEBUG:
+            o.dump(self.logfile, header="=== Note ===", footer= " ")
+        txo = txos.get(o._object_id)
+        if txo:
+            o.text = txo.text
+            o.rich_text_runlist = txo.rich_text_runlist
+            self.cell_note_map[o.rowx, o.colx] = o
+
+    def handle_txo(self, data):
+        if self.biff_version < 80:
+            return
+        o = MSTxo()
+        fmt = '<HH6sHHH'
+        fmtsize = calcsize(fmt)
+        option_flags, o.rot, controlInfo, cchText, cbRuns, o.ifntEmpty = unpack(fmt, data[:fmtsize])
+        o.fmla = data[fmtsize:]
+        upkbits(o, option_flags, (
+            ( 3, 0x000E, 'horz_align'),
+            ( 6, 0x0070, 'vert_align'),
+            ( 9, 0x0200, 'lock_text'),
+            (14, 0x4000, 'just_last'),
+            (15, 0x8000, 'secret_edit'),
+        ))
+        totchars = 0
+        o.text = UNICODE_LITERAL('')
+        while totchars < cchText:
+            rc2, data2_len, data2 = self.book.get_record_parts()
+            assert rc2 == XL_CONTINUE
+            if OBJ_MSO_DEBUG:
+                hex_char_dump(data2, 0, data2_len, base=0, fout=self.logfile)
+            nb = BYTES_ORD(data2[0]) # 0 means latin1, 1 means utf_16_le
+            nchars = data2_len - 1
+            if nb:
+                assert nchars % 2 == 0
+                nchars //= 2
+            utext, endpos = unpack_unicode_update_pos(data2, 0, known_len=nchars)
+            assert endpos == data2_len
+            o.text += utext
+            totchars += nchars
+        o.rich_text_runlist = []
+        totruns = 0
+        while totruns < cbRuns: # counts of BYTES, not runs
+            rc3, data3_len, data3 = self.book.get_record_parts()
+            # print totruns, cbRuns, rc3, data3_len, repr(data3)
+            assert rc3 == XL_CONTINUE
+            assert data3_len % 8 == 0
+            for pos in xrange(0, data3_len, 8):
+                run = unpack('<HH4x', data3[pos:pos+8])
+                o.rich_text_runlist.append(run)
+                totruns += 8
+        # remove trailing entries that point to the end of the string
+        while o.rich_text_runlist and o.rich_text_runlist[-1][0] == cchText:
+            del o.rich_text_runlist[-1]
+        if OBJ_MSO_DEBUG:
+            o.dump(self.logfile, header="=== MSTxo ===", footer= " ")
+            print(o.rich_text_runlist, file=self.logfile)
+        return o
+
+    def handle_feat11(self, data):
+        if not OBJ_MSO_DEBUG:
+            return
+        # rt: Record type; this matches the BIFF rt in the first two bytes of the record; =0872h
+        # grbitFrt: FRT cell reference flag (see table below for details)
+        # Ref0: Range reference to a worksheet cell region if grbitFrt=1 (bitFrtRef). Otherwise blank.
+        # isf: Shared feature type index =5 for Table
+        # fHdr: =0 since this is for feat not feat header
+        # reserved0: Reserved for future use =0 for Table
+        # cref: Count of ref ranges this feature is on
+        # cbFeatData: Count of byte for the current feature data.
+        # reserved1: =0 currently not used
+        # Ref1: Repeat of Ref0. UNDOCUMENTED
+        rt, grbitFrt, Ref0, isf, fHdr, reserved0, cref, cbFeatData, reserved1, Ref1 = unpack('<HH8sHBiHiH8s', data[0:35])
+        assert reserved0 == 0
+        assert reserved1 == 0
+        assert isf == 5
+        assert rt == 0x872
+        assert fHdr == 0
+        assert Ref1 == Ref0
+        print(self.logfile, "FEAT11: grbitFrt=%d  Ref0=%r cref=%d cbFeatData=%d\n", grbitFrt, Ref0, cref, cbFeatData)
+        # lt: Table data source type:
+        #   =0 for Excel Worksheet Table =1 for read-write SharePoint linked List
+        #   =2 for XML mapper Table =3 for Query Table
+        # idList: The ID of the Table (unique per worksheet)
+        # crwHeader: How many header/title rows the Table has at the top
+        # crwTotals: How many total rows the Table has at the bottom
+        # idFieldNext: Next id to try when assigning a unique id to a new field
+        # cbFSData: The size of the Fixed Data portion of the Table data structure.
+        # rupBuild: the rupBuild that generated the record
+        # unusedShort: UNUSED short that can be used later. The value is reserved during round-tripping.
+        # listFlags: Collection of bit flags: (see listFlags' bit setting table below for detail.)
+        # lPosStmCache: Table data stream position of cached data
+        # cbStmCache: Count of bytes of cached data
+        # cchStmCache: Count of characters of uncompressed cached data in the stream
+        # lem: Table edit mode (see List (Table) Editing Mode (lem) setting table below for details.)
+        # rgbHashParam: Hash value for SharePoint Table
+        # cchName: Count of characters in the Table name string rgbName
+        (lt, idList, crwHeader, crwTotals, idFieldNext, cbFSData,
+        rupBuild, unusedShort, listFlags, lPosStmCache, cbStmCache,
+        cchStmCache, lem, rgbHashParam, cchName) = unpack('<iiiiiiHHiiiii16sH', data[35:35+66])
+        print("lt=%d  idList=%d crwHeader=%d  crwTotals=%d  idFieldNext=%d cbFSData=%d\n"
+            "rupBuild=%d  unusedShort=%d listFlags=%04X  lPosStmCache=%d  cbStmCache=%d\n"
+            "cchStmCache=%d  lem=%d  rgbHashParam=%r  cchName=%d" % (
+                lt, idList, crwHeader, crwTotals, idFieldNext, cbFSData,
+                rupBuild, unusedShort,listFlags, lPosStmCache, cbStmCache,
+                cchStmCache, lem, rgbHashParam, cchName), file=self.logfile)
+
+    def __repr__(self):
+        return "Sheet {:>2}:<{}>".format(self.number, self.name)
+
+
+class MSODrawing(BaseObject):
+    pass
+
+
+class MSObj(BaseObject):
+    pass
+
+
+class MSTxo(BaseObject):
+    pass
+
+
+class Note(BaseObject):
+    """
+    Represents a user "comment" or "note".
+    Note objects are accessible through :attr:`Sheet.cell_note_map`.
+
+    .. versionadded:: 0.7.2
+    """
+
+    #: Author of note
+    author = UNICODE_LITERAL('')
+
+    #: ``True`` if the containing column is hidden
+    col_hidden = 0
+
+    #: Column index
+    colx = 0
+
+    #: List of ``(offset_in_string, font_index)`` tuples.
+    #: Unlike :attr:`Sheet.rich_text_runlist_map`, the first offset should
+    #: always be 0.
+    rich_text_runlist = None
+
+    #: True if the containing row is hidden
+    row_hidden = 0
+
+    #: Row index
+    rowx = 0
+
+    #: True if note is always shown
+    show = 0
+
+    #: Text of the note
+    text = UNICODE_LITERAL('')
+
+
+class Hyperlink(BaseObject):
+    """
+    Contains the attributes of a hyperlink.
+    Hyperlink objects are accessible through :attr:`Sheet.hyperlink_list`
+    and :attr:`Sheet.hyperlink_map`.
+
+    .. versionadded:: 0.7.2
+    """
+
+    #: Index of first row
+    frowx = None
+
+    #: Index of last row
+    lrowx = None
+
+    #: Index of first column
+    fcolx = None
+
+    #: Index of last column
+    lcolx = None
+
+    #: Type of hyperlink. Unicode string, one of 'url', 'unc',
+    #: 'local file', 'workbook', 'unknown'
+    type = None
+
+    #: The URL or file-path, depending in the type. Unicode string, except
+    #: in the rare case of a local but non-existent file with non-ASCII
+    #: characters in the name, in which case only the "8.3" filename is
+    #: available, as a :class:`bytes` (3.x) or :class:`str` (2.x) string,
+    #: *with unknown encoding.*
+    url_or_path = None
+
+    #: Description.
+    #: This is displayed in the cell,
+    #: and should be identical to the cell value. Unicode string, or ``None``.
+    #: It seems impossible NOT to have a description created by the Excel UI.
+    desc = None
+
+    #: Target frame. Unicode string.
+    #:
+    #: .. note::
+    #:   No cases of this have been seen in the wild.
+    #:   It seems impossible to create one in the Excel UI.
+    target = None
+
+    #: The piece after the "#" in
+    #: "http://docs.python.org/library#struct_module", or the ``Sheet1!A1:Z99``
+    #: part when type is "workbook".
+    textmark = None
+
+    #: The text of the "quick tip" displayed when the cursor
+    #: hovers over the hyperlink.
+    quicktip = None
+
+# === helpers ===
+
+def unpack_RK(rk_str):
+    flags = BYTES_ORD(rk_str[0])
+    if flags & 2:
+        # There's a SIGNED 30-bit integer in there!
+        i,  = unpack('<i', rk_str)
+        i >>= 2 # div by 4 to drop the 2 flag bits
+        if flags & 1:
+            return i / 100.0
+        return float(i)
+    else:
+        # It's the most significant 30 bits of an IEEE 754 64-bit FP number
+        d, = unpack('<d', b'\0\0\0\0' + BYTES_LITERAL(chr(flags & 252)) + rk_str[1:4])
+        if flags & 1:
+            return d / 100.0
+        return d
+
+##### =============== Cell ======================================== #####
+
+cellty_from_fmtty = {
+    FNU: XL_CELL_NUMBER,
+    FUN: XL_CELL_NUMBER,
+    FGE: XL_CELL_NUMBER,
+    FDT: XL_CELL_DATE,
+    FTX: XL_CELL_NUMBER, # Yes, a number can be formatted as text.
+}
+
+ctype_text = {
+    XL_CELL_EMPTY: 'empty',
+    XL_CELL_TEXT: 'text',
+    XL_CELL_NUMBER: 'number',
+    XL_CELL_DATE: 'xldate',
+    XL_CELL_BOOLEAN: 'bool',
+    XL_CELL_ERROR: 'error',
+    XL_CELL_BLANK: 'blank',
+}
+
+
+class Cell(BaseObject):
+    """
+    Contains the data for one cell.
+
+    .. warning::
+      You don't call this class yourself. You access :class:`Cell` objects
+      via methods of the :class:`Sheet` object(s) that you found in the
+      :class:`~xlrd.book.Book` object that was returned when you called
+      :func:`~xlrd.open_workbook`
+
+    Cell objects have three attributes: ``ctype`` is an int, ``value``
+    (which depends on ``ctype``) and ``xf_index``.
+    If ``formatting_info`` is not enabled when the workbook is opened,
+    ``xf_index`` will be ``None``.
+
+    The following table describes the types of cells and how their values
+    are represented in Python.
+
+    .. raw:: html
+
+        <table border="1" cellpadding="7">
+        <tr>
+        <th>Type symbol</th>
+        <th>Type number</th>
+        <th>Python value</th>
+        </tr>
+        <tr>
+        <td>XL_CELL_EMPTY</td>
+        <td align="center">0</td>
+        <td>empty string ''</td>
+        </tr>
+        <tr>
+        <td>XL_CELL_TEXT</td>
+        <td align="center">1</td>
+        <td>a Unicode string</td>
+        </tr>
+        <tr>
+        <td>XL_CELL_NUMBER</td>
+        <td align="center">2</td>
+        <td>float</td>
+        </tr>
+        <tr>
+        <td>XL_CELL_DATE</td>
+        <td align="center">3</td>
+        <td>float</td>
+        </tr>
+        <tr>
+        <td>XL_CELL_BOOLEAN</td>
+        <td align="center">4</td>
+        <td>int; 1 means TRUE, 0 means FALSE</td>
+        </tr>
+        <tr>
+        <td>XL_CELL_ERROR</td>
+        <td align="center">5</td>
+        <td>int representing internal Excel codes; for a text representation,
+        refer to the supplied dictionary error_text_from_code</td>
+        </tr>
+        <tr>
+        <td>XL_CELL_BLANK</td>
+        <td align="center">6</td>
+        <td>empty string ''. Note: this type will appear only when
+        open_workbook(..., formatting_info=True) is used.</td>
+        </tr>
+        </table>
+    """
+
+    __slots__ = ['ctype', 'value', 'xf_index']
+
+    def __init__(self, ctype, value, xf_index=None):
+        self.ctype = ctype
+        self.value = value
+        self.xf_index = xf_index
+
+    def __repr__(self):
+        if self.xf_index is None:
+            return "%s:%r" % (ctype_text[self.ctype], self.value)
+        else:
+            return "%s:%r (XF:%r)" % (ctype_text[self.ctype], self.value, self.xf_index)
+
+empty_cell = Cell(XL_CELL_EMPTY, UNICODE_LITERAL(''))
+
+##### =============== Colinfo and Rowinfo ============================== #####
+
+
+class Colinfo(BaseObject):
+    """
+    Width and default formatting information that applies to one or
+    more columns in a sheet. Derived from ``COLINFO`` records.
+
+    Here is the default hierarchy for width, according to the OOo docs:
+
+      In BIFF3, if a ``COLINFO`` record is missing for a column,
+      the width specified in the record ``DEFCOLWIDTH`` is used instead.
+
+      In BIFF4-BIFF7, the width set in this ``COLINFO`` record is only used,
+      if the corresponding bit for this column is cleared in the ``GCW``
+      record, otherwise the column width set in the ``DEFCOLWIDTH`` record
+      is used (the ``STANDARDWIDTH`` record is always ignored in this case [#f1]_).
+
+      In BIFF8, if a ``COLINFO`` record is missing for a column,
+      the width specified in the record ``STANDARDWIDTH`` is used.
+      If this ``STANDARDWIDTH`` record is also missing,
+      the column width of the record ``DEFCOLWIDTH`` is used instead.
+
+    .. [#f1] The docs on the ``GCW`` record say this:
+
+      If a bit is set, the corresponding column uses the width set in the
+      ``STANDARDWIDTH`` record. If a bit is cleared, the corresponding column
+      uses the width set in the ``COLINFO`` record for this column.
+
+      If a bit is set, and the worksheet does not contain the ``STANDARDWIDTH``
+      record, or if the bit is cleared, and the worksheet does not contain the
+      ``COLINFO`` record, the ``DEFCOLWIDTH`` record of the worksheet will be
+      used instead.
+
+    xlrd goes with the GCW version of the story.
+    Reference to the source may be useful: see
+    :meth:`Sheet.computed_column_width`.
+
+    .. versionadded:: 0.6.1
+    """
+
+    #: Width of the column in 1/256 of the width of the zero character,
+    #: using default font (first ``FONT`` record in the file).
+    width = 0
+
+    #: XF index to be used for formatting empty cells.
+    xf_index = -1
+
+    #: 1 = column is hidden
+    hidden = 0
+
+    #: Value of a 1-bit flag whose purpose is unknown
+    #: but is often seen set to 1
+    bit1_flag = 0
+
+    #: Outline level of the column, in ``range(7)``.
+    #: (0 = no outline)
+    outline_level = 0
+
+    #: 1 = column is collapsed
+    collapsed = 0
+
+_USE_SLOTS = 1
+
+
+class Rowinfo(BaseObject):
+    """
+    Height and default formatting information that applies to a row in a sheet.
+    Derived from ``ROW`` records.
+
+    .. versionadded:: 0.6.1
+    """
+
+    if _USE_SLOTS:
+        __slots__ = (
+            "height",
+            "has_default_height",
+            "outline_level",
+            "outline_group_starts_ends",
+            "hidden",
+            "height_mismatch",
+            "has_default_xf_index",
+            "xf_index",
+            "additional_space_above",
+            "additional_space_below",
+        )
+
+    def __init__(self):
+        #: Height of the row, in twips. One twip == 1/20 of a point.
+        self.height = None
+
+        #: 0 = Row has custom height; 1 = Row has default height.
+        self.has_default_height = None
+
+        #: Outline level of the row (0 to 7)
+        self.outline_level = None
+
+        #: 1 = Outline group starts or ends here (depending on where the
+        #: outline buttons are located, see ``WSBOOL`` record, which is not
+        #: parsed by xlrd), *and* is collapsed.
+        self.outline_group_starts_ends = None
+
+        #: 1 = Row is hidden (manually, or by a filter or outline group)
+        self.hidden = None
+
+        #: 1 = Row height and default font height do not match.
+        self.height_mismatch = None
+
+        #: 1 = the xf_index attribute is usable; 0 = ignore it.
+        self.has_default_xf_index = None
+
+        #: Index to default :class:`~xlrd.formatting.XF` record for empty cells
+        #: in this row. Don't use this if ``has_default_xf_index == 0``.
+        self.xf_index = None
+
+        #: This flag is set if the upper border of at least one cell in this
+        #: row or if the lower border of at least one cell in the row above is
+        #: formatted with a thick line style. Thin and medium line styles are
+        #: not taken into account.
+        self.additional_space_above = None
+
+        #: This flag is set if the lower border of at least one cell in this row
+        #: or if the upper border of at least one cell in the row below is
+        #: formatted with a medium or thick line style. Thin line styles are not
+        #: taken into account.
+        self.additional_space_below = None
+
+    def __getstate__(self):
+        return (
+            self.height,
+            self.has_default_height,
+            self.outline_level,
+            self.outline_group_starts_ends,
+            self.hidden,
+            self.height_mismatch,
+            self.has_default_xf_index,
+            self.xf_index,
+            self.additional_space_above,
+            self.additional_space_below,
+        )
+
+    def __setstate__(self, state):
+        (
+            self.height,
+            self.has_default_height,
+            self.outline_level,
+            self.outline_group_starts_ends,
+            self.hidden,
+            self.height_mismatch,
+            self.has_default_xf_index,
+            self.xf_index,
+            self.additional_space_above,
+            self.additional_space_below,
+        ) = state
diff --git a/.venv/lib/python3.12/site-packages/xlrd/timemachine.py b/.venv/lib/python3.12/site-packages/xlrd/timemachine.py
new file mode 100644
index 00000000..a519299e
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/timemachine.py
@@ -0,0 +1,53 @@
+##
+# <p>Copyright (c) 2006-2012 Stephen John Machin, Lingfo Pty Ltd</p>
+# <p>This module is part of the xlrd package, which is released under a BSD-style licence.</p>
+##
+
+# timemachine.py -- adaptation for single codebase.
+# Currently supported: 2.6 to 2.7, 3.2+
+# usage: from timemachine import *
+
+from __future__ import print_function
+
+import sys
+
+python_version = sys.version_info[:2] # e.g. version 2.6 -> (2, 6)
+
+if python_version >= (3, 0):
+    # Python 3
+    BYTES_LITERAL = lambda x: x.encode('latin1')
+    UNICODE_LITERAL = lambda x: x
+    BYTES_ORD = lambda byte: byte
+    from io import BytesIO as BYTES_IO
+    def fprintf(f, fmt, *vargs):
+        fmt = fmt.replace("%r", "%a")
+        if fmt.endswith('\n'):
+            print(fmt[:-1] % vargs, file=f)
+        else:
+            print(fmt % vargs, end=' ', file=f)
+    EXCEL_TEXT_TYPES = (str, bytes, bytearray) # xlwt: isinstance(obj, EXCEL_TEXT_TYPES)
+    REPR = ascii
+    xrange = range
+    unicode = lambda b, enc: b.decode(enc)
+    ensure_unicode = lambda s: s
+    unichr = chr
+else:
+    # Python 2
+    BYTES_LITERAL = lambda x: x
+    UNICODE_LITERAL = lambda x: x.decode('latin1')
+    BYTES_ORD = ord
+    from cStringIO import StringIO as BYTES_IO
+    def fprintf(f, fmt, *vargs):
+        if fmt.endswith('\n'):
+            print(fmt[:-1] % vargs, file=f)
+        else:
+            print(fmt % vargs, end=' ', file=f)
+    try:
+        EXCEL_TEXT_TYPES = basestring # xlwt: isinstance(obj, EXCEL_TEXT_TYPES)
+    except NameError:
+        EXCEL_TEXT_TYPES = (str, unicode)
+    REPR = repr
+    xrange = xrange
+    # following used only to overcome 2.x ElementTree gimmick which
+    # returns text as `str` if it's ascii, otherwise `unicode`
+    ensure_unicode = unicode # used only in xlsx.py
diff --git a/.venv/lib/python3.12/site-packages/xlrd/xldate.py b/.venv/lib/python3.12/site-packages/xlrd/xldate.py
new file mode 100644
index 00000000..d84c6508
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/xlrd/xldate.py
@@ -0,0 +1,248 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2005-2008 Stephen John Machin, Lingfo Pty Ltd
+# This module is part of the xlrd package, which is released under a
+# BSD-style licence.
+# No part of the content of this file was derived from the works of David Giffin.
+"""
+Tools for working with dates and times in Excel files.
+
+The conversion from ``days`` to ``(year, month, day)`` starts with
+an integral "julian day number" aka JDN.
+FWIW:
+
+- JDN 0 corresponds to noon on Monday November 24 in Gregorian year -4713.
+
+More importantly:
+
+- Noon on Gregorian 1900-03-01 (day 61 in the 1900-based system) is JDN 2415080.0
+- Noon on Gregorian 1904-01-02 (day  1 in the 1904-based system) is JDN 2416482.0
+
+"""
+import datetime
+
+_JDN_delta = (2415080 - 61, 2416482 - 1)
+assert _JDN_delta[1] - _JDN_delta[0] == 1462
+
+# Pre-calculate the datetime epochs for efficiency.
+epoch_1904 = datetime.datetime(1904, 1, 1)
+epoch_1900 = datetime.datetime(1899, 12, 31)
+epoch_1900_minus_1 = datetime.datetime(1899, 12, 30)
+
+# This is equivalent to 10000-01-01:
+_XLDAYS_TOO_LARGE = (2958466, 2958466 - 1462)
+
+
+class XLDateError(ValueError):
+    "A base class for all datetime-related errors."
+
+
+class XLDateNegative(XLDateError):
+    "``xldate < 0.00``"
+
+
+class XLDateAmbiguous(XLDateError):
+    "The 1900 leap-year problem ``(datemode == 0 and 1.0 <= xldate < 61.0)``"
+
+
+class XLDateTooLarge(XLDateError):
+    "Gregorian year 10000 or later"
+
+
+class XLDateBadDatemode(XLDateError):
+    "``datemode`` arg is neither 0 nor 1"
+
+
+class XLDateBadTuple(XLDateError):
+    pass
+
+
+def xldate_as_tuple(xldate, datemode):
+    """
+    Convert an Excel number (presumed to represent a date, a datetime or a time) into
+    a tuple suitable for feeding to datetime or mx.DateTime constructors.
+
+    :param xldate: The Excel number
+    :param datemode: 0: 1900-based, 1: 1904-based.
+    :raises xlrd.xldate.XLDateNegative:
+    :raises xlrd.xldate.XLDateAmbiguous:
+
+    :raises xlrd.xldate.XLDateTooLarge:
+    :raises xlrd.xldate.XLDateBadDatemode:
+    :raises xlrd.xldate.XLDateError:
+    :returns: Gregorian ``(year, month, day, hour, minute, nearest_second)``.
+
+    .. warning::
+
+      When using this function to interpret the contents of a workbook, you
+      should pass in the :attr:`~xlrd.book.Book.datemode`
+      attribute of that workbook. Whether the workbook has ever been anywhere
+      near a Macintosh is irrelevant.
+
+    .. admonition:: Special case
+
+        If ``0.0 <= xldate < 1.0``, it is assumed to represent a time;
+        ``(0, 0, 0, hour, minute, second)`` will be returned.
+
+    .. note::
+
+        ``1904-01-01`` is not regarded as a valid date in the ``datemode==1``
+        system; its "serial number" is zero.
+    """
+    if datemode not in (0, 1):
+        raise XLDateBadDatemode(datemode)
+    if xldate == 0.00:
+        return (0, 0, 0, 0, 0, 0)
+    if xldate < 0.00:
+        raise XLDateNegative(xldate)
+    xldays = int(xldate)
+    frac = xldate - xldays
+    seconds = int(round(frac * 86400.0))
+    assert 0 <= seconds <= 86400
+    if seconds == 86400:
+        hour = minute = second = 0
+        xldays += 1
+    else:
+        # second = seconds % 60; minutes = seconds // 60
+        minutes, second = divmod(seconds, 60)
+        # minute = minutes % 60; hour    = minutes // 60
+        hour, minute = divmod(minutes, 60)
+    if xldays >= _XLDAYS_TOO_LARGE[datemode]:
+        raise XLDateTooLarge(xldate)
+
+    if xldays == 0:
+        return (0, 0, 0, hour, minute, second)
+
+    if xldays < 61 and datemode == 0:
+        raise XLDateAmbiguous(xldate)
+
+    jdn = xldays + _JDN_delta[datemode]
+    yreg = ((((jdn * 4 + 274277) // 146097) * 3 // 4) + jdn + 1363) * 4 + 3
+    mp = ((yreg % 1461) // 4) * 535 + 333
+    d = ((mp % 16384) // 535) + 1
+    # mp /= 16384
+    mp >>= 14
+    if mp >= 10:
+        return ((yreg // 1461) - 4715, mp - 9, d, hour, minute, second)
+    else:
+        return ((yreg // 1461) - 4716, mp + 3, d, hour, minute, second)
+
+
+def xldate_as_datetime(xldate, datemode):
+    """
+    Convert an Excel date/time number into a :class:`datetime.datetime` object.
+
+    :param xldate: The Excel number
+    :param datemode: 0: 1900-based, 1: 1904-based.
+
+    :returns: A :class:`datetime.datetime` object.
+    """
+
+    # Set the epoch based on the 1900/1904 datemode.
+    if datemode:
+        epoch = epoch_1904
+    else:
+        if xldate < 60:
+            epoch = epoch_1900
+        else:
+            # Workaround Excel 1900 leap year bug by adjusting the epoch.
+            epoch = epoch_1900_minus_1
+
+    # The integer part of the Excel date stores the number of days since
+    # the epoch and the fractional part stores the percentage of the day.
+    days = int(xldate)
+    fraction = xldate - days
+
+    # Get the the integer and decimal seconds in Excel's millisecond resolution.
+    seconds = int(round(fraction * 86400000.0))
+    seconds, milliseconds = divmod(seconds, 1000)
+
+    return epoch + datetime.timedelta(days, seconds, 0, milliseconds)
+
+
+# === conversions from date/time to xl numbers
+
+def _leap(y):
+    if y % 4: return 0
+    if y % 100: return 1
+    if y % 400: return 0
+    return 1
+
+_days_in_month = (None, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
+
+
+def xldate_from_date_tuple(date_tuple, datemode):
+    """
+    Convert a date tuple (year, month, day) to an Excel date.
+
+    :param year: Gregorian year.
+    :param month: ``1 <= month <= 12``
+    :param day: ``1 <= day <= last day of that (year, month)``
+    :param datemode: 0: 1900-based, 1: 1904-based.
+    :raises xlrd.xldate.XLDateAmbiguous:
+    :raises xlrd.xldate.XLDateBadDatemode:
+    :raises xlrd.xldate.XLDateBadTuple:
+      ``(year, month, day)`` is too early/late or has invalid component(s)
+    :raises xlrd.xldate.XLDateError:
+    """
+    year, month, day = date_tuple
+
+    if datemode not in (0, 1):
+        raise XLDateBadDatemode(datemode)
+
+    if year == 0 and month == 0 and day == 0:
+        return 0.00
+
+    if not (1900 <= year <= 9999):
+        raise XLDateBadTuple("Invalid year: %r" % ((year, month, day),))
+    if not (1 <= month <= 12):
+        raise XLDateBadTuple("Invalid month: %r" % ((year, month, day),))
+    if  (day < 1 or
+         (day > _days_in_month[month] and not(day == 29 and month == 2 and _leap(year)))):
+        raise XLDateBadTuple("Invalid day: %r" % ((year, month, day),))
+
+    Yp = year + 4716
+    M = month
+    if M <= 2:
+        Yp = Yp - 1
+        Mp = M + 9
+    else:
+        Mp = M - 3
+    jdn = (1461 * Yp // 4) + ((979 * Mp + 16) // 32) + \
+        day - 1364 - (((Yp + 184) // 100) * 3 // 4)
+    xldays = jdn - _JDN_delta[datemode]
+    if xldays <= 0:
+        raise XLDateBadTuple("Invalid (year, month, day): %r" % ((year, month, day),))
+    if xldays < 61 and datemode == 0:
+        raise XLDateAmbiguous("Before 1900-03-01: %r" % ((year, month, day),))
+    return float(xldays)
+
+
+def xldate_from_time_tuple(time_tuple):
+    """
+    Convert a time tuple ``(hour, minute, second)`` to an Excel "date" value
+    (fraction of a day).
+
+    :param hour: ``0 <= hour < 24``
+    :param minute: ``0 <= minute < 60``
+    :param second: ``0 <= second < 60``
+    :raises xlrd.xldate.XLDateBadTuple: Out-of-range hour, minute, or second
+    """
+    hour, minute, second = time_tuple
+    if 0 <= hour < 24 and 0 <= minute < 60 and 0 <= second < 60:
+        return ((second / 60.0 + minute) / 60.0 + hour) / 24.0
+    raise XLDateBadTuple("Invalid (hour, minute, second): %r" % ((hour, minute, second),))
+
+
+def xldate_from_datetime_tuple(datetime_tuple, datemode):
+    """
+    Convert a datetime tuple ``(year, month, day, hour, minute, second)`` to an
+    Excel date value.
+    For more details, refer to other xldate_from_*_tuple functions.
+
+    :param datetime_tuple: ``(year, month, day, hour, minute, second)``
+    :param datemode: 0: 1900-based, 1: 1904-based.
+    """
+    return (
+        xldate_from_date_tuple(datetime_tuple[:3], datemode) +
+        xldate_from_time_tuple(datetime_tuple[3:])
+    )