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+#
+# The Python Imaging Library.
+# $Id$
+#
+# GD file handling
+#
+# History:
+# 1996-04-12 fl   Created
+#
+# Copyright (c) 1997 by Secret Labs AB.
+# Copyright (c) 1996 by Fredrik Lundh.
+#
+# See the README file for information on usage and redistribution.
+#
+
+
+"""
+.. note::
+    This format cannot be automatically recognized, so the
+    class is not registered for use with :py:func:`PIL.Image.open()`.  To open a
+    gd file, use the :py:func:`PIL.GdImageFile.open()` function instead.
+
+.. warning::
+    THE GD FORMAT IS NOT DESIGNED FOR DATA INTERCHANGE.  This
+    implementation is provided for convenience and demonstrational
+    purposes only.
+"""
+from __future__ import annotations
+
+from typing import IO
+
+from . import ImageFile, ImagePalette, UnidentifiedImageError
+from ._binary import i16be as i16
+from ._binary import i32be as i32
+from ._typing import StrOrBytesPath
+
+
+class GdImageFile(ImageFile.ImageFile):
+    """
+    Image plugin for the GD uncompressed format.  Note that this format
+    is not supported by the standard :py:func:`PIL.Image.open()` function.  To use
+    this plugin, you have to import the :py:mod:`PIL.GdImageFile` module and
+    use the :py:func:`PIL.GdImageFile.open()` function.
+    """
+
+    format = "GD"
+    format_description = "GD uncompressed images"
+
+    def _open(self) -> None:
+        # Header
+        assert self.fp is not None
+
+        s = self.fp.read(1037)
+
+        if i16(s) not in [65534, 65535]:
+            msg = "Not a valid GD 2.x .gd file"
+            raise SyntaxError(msg)
+
+        self._mode = "L"  # FIXME: "P"
+        self._size = i16(s, 2), i16(s, 4)
+
+        true_color = s[6]
+        true_color_offset = 2 if true_color else 0
+
+        # transparency index
+        tindex = i32(s, 7 + true_color_offset)
+        if tindex < 256:
+            self.info["transparency"] = tindex
+
+        self.palette = ImagePalette.raw(
+            "XBGR", s[7 + true_color_offset + 4 : 7 + true_color_offset + 4 + 256 * 4]
+        )
+
+        self.tile = [
+            ImageFile._Tile(
+                "raw",
+                (0, 0) + self.size,
+                7 + true_color_offset + 4 + 256 * 4,
+                "L",
+            )
+        ]
+
+
+def open(fp: StrOrBytesPath | IO[bytes], mode: str = "r") -> GdImageFile:
+    """
+    Load texture from a GD image file.
+
+    :param fp: GD file name, or an opened file handle.
+    :param mode: Optional mode.  In this version, if the mode argument
+        is given, it must be "r".
+    :returns: An image instance.
+    :raises OSError: If the image could not be read.
+    """
+    if mode != "r":
+        msg = "bad mode"
+        raise ValueError(msg)
+
+    try:
+        return GdImageFile(fp)
+    except SyntaxError as e:
+        msg = "cannot identify this image file"
+        raise UnidentifiedImageError(msg) from e