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Diffstat (limited to '.venv/lib/python3.12/site-packages/pyasn1/codec/ber/encoder.py')
| -rw-r--r-- | .venv/lib/python3.12/site-packages/pyasn1/codec/ber/encoder.py | 954 |
1 files changed, 954 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/pyasn1/codec/ber/encoder.py b/.venv/lib/python3.12/site-packages/pyasn1/codec/ber/encoder.py new file mode 100644 index 00000000..d16fb1f8 --- /dev/null +++ b/.venv/lib/python3.12/site-packages/pyasn1/codec/ber/encoder.py @@ -0,0 +1,954 @@ +# +# This file is part of pyasn1 software. +# +# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com> +# License: https://pyasn1.readthedocs.io/en/latest/license.html +# +import sys +import warnings + +from pyasn1 import debug +from pyasn1 import error +from pyasn1.codec.ber import eoo +from pyasn1.compat import _MISSING +from pyasn1.compat.integer import to_bytes +from pyasn1.type import char +from pyasn1.type import tag +from pyasn1.type import univ +from pyasn1.type import useful + +__all__ = ['Encoder', 'encode'] + +LOG = debug.registerLoggee(__name__, flags=debug.DEBUG_ENCODER) + + +class AbstractItemEncoder(object): + supportIndefLenMode = True + + # An outcome of otherwise legit call `encodeFun(eoo.endOfOctets)` + eooIntegerSubstrate = (0, 0) + eooOctetsSubstrate = bytes(eooIntegerSubstrate) + + # noinspection PyMethodMayBeStatic + def encodeTag(self, singleTag, isConstructed): + tagClass, tagFormat, tagId = singleTag + encodedTag = tagClass | tagFormat + if isConstructed: + encodedTag |= tag.tagFormatConstructed + + if tagId < 31: + return encodedTag | tagId, + + else: + substrate = tagId & 0x7f, + + tagId >>= 7 + + while tagId: + substrate = (0x80 | (tagId & 0x7f),) + substrate + tagId >>= 7 + + return (encodedTag | 0x1F,) + substrate + + def encodeLength(self, length, defMode): + if not defMode and self.supportIndefLenMode: + return (0x80,) + + if length < 0x80: + return length, + + else: + substrate = () + while length: + substrate = (length & 0xff,) + substrate + length >>= 8 + + substrateLen = len(substrate) + + if substrateLen > 126: + raise error.PyAsn1Error('Length octets overflow (%d)' % substrateLen) + + return (0x80 | substrateLen,) + substrate + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + raise error.PyAsn1Error('Not implemented') + + def encode(self, value, asn1Spec=None, encodeFun=None, **options): + + if asn1Spec is None: + tagSet = value.tagSet + else: + tagSet = asn1Spec.tagSet + + # untagged item? + if not tagSet: + substrate, isConstructed, isOctets = self.encodeValue( + value, asn1Spec, encodeFun, **options + ) + return substrate + + defMode = options.get('defMode', True) + + substrate = b'' + + for idx, singleTag in enumerate(tagSet.superTags): + + defModeOverride = defMode + + # base tag? + if not idx: + try: + substrate, isConstructed, isOctets = self.encodeValue( + value, asn1Spec, encodeFun, **options + ) + + except error.PyAsn1Error as exc: + raise error.PyAsn1Error( + 'Error encoding %r: %s' % (value, exc)) + + if LOG: + LOG('encoded %svalue %s into %s' % ( + isConstructed and 'constructed ' or '', value, substrate + )) + + if not substrate and isConstructed and options.get('ifNotEmpty', False): + return substrate + + if not isConstructed: + defModeOverride = True + + if LOG: + LOG('overridden encoding mode into definitive for primitive type') + + header = self.encodeTag(singleTag, isConstructed) + + if LOG: + LOG('encoded %stag %s into %s' % ( + isConstructed and 'constructed ' or '', + singleTag, debug.hexdump(bytes(header)))) + + header += self.encodeLength(len(substrate), defModeOverride) + + if LOG: + LOG('encoded %s octets (tag + payload) into %s' % ( + len(substrate), debug.hexdump(bytes(header)))) + + if isOctets: + substrate = bytes(header) + substrate + + if not defModeOverride: + substrate += self.eooOctetsSubstrate + + else: + substrate = header + substrate + + if not defModeOverride: + substrate += self.eooIntegerSubstrate + + if not isOctets: + substrate = bytes(substrate) + + return substrate + + +class EndOfOctetsEncoder(AbstractItemEncoder): + def encodeValue(self, value, asn1Spec, encodeFun, **options): + return b'', False, True + + +class BooleanEncoder(AbstractItemEncoder): + supportIndefLenMode = False + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + return value and (1,) or (0,), False, False + + +class IntegerEncoder(AbstractItemEncoder): + supportIndefLenMode = False + supportCompactZero = False + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if value == 0: + if LOG: + LOG('encoding %spayload for zero INTEGER' % ( + self.supportCompactZero and 'no ' or '' + )) + + # de-facto way to encode zero + if self.supportCompactZero: + return (), False, False + else: + return (0,), False, False + + return to_bytes(int(value), signed=True), False, True + + +class BitStringEncoder(AbstractItemEncoder): + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if asn1Spec is not None: + # TODO: try to avoid ASN.1 schema instantiation + value = asn1Spec.clone(value) + + valueLength = len(value) + if valueLength % 8: + alignedValue = value << (8 - valueLength % 8) + else: + alignedValue = value + + maxChunkSize = options.get('maxChunkSize', 0) + if not maxChunkSize or len(alignedValue) <= maxChunkSize * 8: + substrate = alignedValue.asOctets() + return bytes((len(substrate) * 8 - valueLength,)) + substrate, False, True + + if LOG: + LOG('encoding into up to %s-octet chunks' % maxChunkSize) + + baseTag = value.tagSet.baseTag + + # strip off explicit tags + if baseTag: + tagSet = tag.TagSet(baseTag, baseTag) + + else: + tagSet = tag.TagSet() + + alignedValue = alignedValue.clone(tagSet=tagSet) + + stop = 0 + substrate = b'' + while stop < valueLength: + start = stop + stop = min(start + maxChunkSize * 8, valueLength) + substrate += encodeFun(alignedValue[start:stop], asn1Spec, **options) + + return substrate, True, True + + +class OctetStringEncoder(AbstractItemEncoder): + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + + if asn1Spec is None: + substrate = value.asOctets() + + elif not isinstance(value, bytes): + substrate = asn1Spec.clone(value).asOctets() + + else: + substrate = value + + maxChunkSize = options.get('maxChunkSize', 0) + + if not maxChunkSize or len(substrate) <= maxChunkSize: + return substrate, False, True + + if LOG: + LOG('encoding into up to %s-octet chunks' % maxChunkSize) + + # strip off explicit tags for inner chunks + + if asn1Spec is None: + baseTag = value.tagSet.baseTag + + # strip off explicit tags + if baseTag: + tagSet = tag.TagSet(baseTag, baseTag) + + else: + tagSet = tag.TagSet() + + asn1Spec = value.clone(tagSet=tagSet) + + elif not isinstance(value, bytes): + baseTag = asn1Spec.tagSet.baseTag + + # strip off explicit tags + if baseTag: + tagSet = tag.TagSet(baseTag, baseTag) + + else: + tagSet = tag.TagSet() + + asn1Spec = asn1Spec.clone(tagSet=tagSet) + + pos = 0 + substrate = b'' + + while True: + chunk = value[pos:pos + maxChunkSize] + if not chunk: + break + + substrate += encodeFun(chunk, asn1Spec, **options) + pos += maxChunkSize + + return substrate, True, True + + +class NullEncoder(AbstractItemEncoder): + supportIndefLenMode = False + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + return b'', False, True + + +class ObjectIdentifierEncoder(AbstractItemEncoder): + supportIndefLenMode = False + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if asn1Spec is not None: + value = asn1Spec.clone(value) + + oid = value.asTuple() + + # Build the first pair + try: + first = oid[0] + second = oid[1] + + except IndexError: + raise error.PyAsn1Error('Short OID %s' % (value,)) + + if 0 <= second <= 39: + if first == 1: + oid = (second + 40,) + oid[2:] + elif first == 0: + oid = (second,) + oid[2:] + elif first == 2: + oid = (second + 80,) + oid[2:] + else: + raise error.PyAsn1Error('Impossible first/second arcs at %s' % (value,)) + + elif first == 2: + oid = (second + 80,) + oid[2:] + + else: + raise error.PyAsn1Error('Impossible first/second arcs at %s' % (value,)) + + octets = () + + # Cycle through subIds + for subOid in oid: + if 0 <= subOid <= 127: + # Optimize for the common case + octets += (subOid,) + + elif subOid > 127: + # Pack large Sub-Object IDs + res = (subOid & 0x7f,) + subOid >>= 7 + + while subOid: + res = (0x80 | (subOid & 0x7f),) + res + subOid >>= 7 + + # Add packed Sub-Object ID to resulted Object ID + octets += res + + else: + raise error.PyAsn1Error('Negative OID arc %s at %s' % (subOid, value)) + + return octets, False, False + + +class RelativeOIDEncoder(AbstractItemEncoder): + supportIndefLenMode = False + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if asn1Spec is not None: + value = asn1Spec.clone(value) + + octets = () + + # Cycle through subIds + for subOid in value.asTuple(): + if 0 <= subOid <= 127: + # Optimize for the common case + octets += (subOid,) + + elif subOid > 127: + # Pack large Sub-Object IDs + res = (subOid & 0x7f,) + subOid >>= 7 + + while subOid: + res = (0x80 | (subOid & 0x7f),) + res + subOid >>= 7 + + # Add packed Sub-Object ID to resulted RELATIVE-OID + octets += res + + else: + raise error.PyAsn1Error('Negative RELATIVE-OID arc %s at %s' % (subOid, value)) + + return octets, False, False + + +class RealEncoder(AbstractItemEncoder): + supportIndefLenMode = False + binEncBase = 2 # set to None to choose encoding base automatically + + @staticmethod + def _dropFloatingPoint(m, encbase, e): + ms, es = 1, 1 + if m < 0: + ms = -1 # mantissa sign + + if e < 0: + es = -1 # exponent sign + + m *= ms + + if encbase == 8: + m *= 2 ** (abs(e) % 3 * es) + e = abs(e) // 3 * es + + elif encbase == 16: + m *= 2 ** (abs(e) % 4 * es) + e = abs(e) // 4 * es + + while True: + if int(m) != m: + m *= encbase + e -= 1 + continue + break + + return ms, int(m), encbase, e + + def _chooseEncBase(self, value): + m, b, e = value + encBase = [2, 8, 16] + if value.binEncBase in encBase: + return self._dropFloatingPoint(m, value.binEncBase, e) + + elif self.binEncBase in encBase: + return self._dropFloatingPoint(m, self.binEncBase, e) + + # auto choosing base 2/8/16 + mantissa = [m, m, m] + exponent = [e, e, e] + sign = 1 + encbase = 2 + e = float('inf') + + for i in range(3): + (sign, + mantissa[i], + encBase[i], + exponent[i]) = self._dropFloatingPoint(mantissa[i], encBase[i], exponent[i]) + + if abs(exponent[i]) < abs(e) or (abs(exponent[i]) == abs(e) and mantissa[i] < m): + e = exponent[i] + m = int(mantissa[i]) + encbase = encBase[i] + + if LOG: + LOG('automatically chosen REAL encoding base %s, sign %s, mantissa %s, ' + 'exponent %s' % (encbase, sign, m, e)) + + return sign, m, encbase, e + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if asn1Spec is not None: + value = asn1Spec.clone(value) + + if value.isPlusInf: + return (0x40,), False, False + + if value.isMinusInf: + return (0x41,), False, False + + m, b, e = value + + if not m: + return b'', False, True + + if b == 10: + if LOG: + LOG('encoding REAL into character form') + + return b'\x03%dE%s%d' % (m, e == 0 and b'+' or b'', e), False, True + + elif b == 2: + fo = 0x80 # binary encoding + ms, m, encbase, e = self._chooseEncBase(value) + + if ms < 0: # mantissa sign + fo |= 0x40 # sign bit + + # exponent & mantissa normalization + if encbase == 2: + while m & 0x1 == 0: + m >>= 1 + e += 1 + + elif encbase == 8: + while m & 0x7 == 0: + m >>= 3 + e += 1 + fo |= 0x10 + + else: # encbase = 16 + while m & 0xf == 0: + m >>= 4 + e += 1 + fo |= 0x20 + + sf = 0 # scale factor + + while m & 0x1 == 0: + m >>= 1 + sf += 1 + + if sf > 3: + raise error.PyAsn1Error('Scale factor overflow') # bug if raised + + fo |= sf << 2 + eo = b'' + if e == 0 or e == -1: + eo = bytes((e & 0xff,)) + + else: + while e not in (0, -1): + eo = bytes((e & 0xff,)) + eo + e >>= 8 + + if e == 0 and eo and eo[0] & 0x80: + eo = bytes((0,)) + eo + + if e == -1 and eo and not (eo[0] & 0x80): + eo = bytes((0xff,)) + eo + + n = len(eo) + if n > 0xff: + raise error.PyAsn1Error('Real exponent overflow') + + if n == 1: + pass + + elif n == 2: + fo |= 1 + + elif n == 3: + fo |= 2 + + else: + fo |= 3 + eo = bytes((n & 0xff,)) + eo + + po = b'' + + while m: + po = bytes((m & 0xff,)) + po + m >>= 8 + + substrate = bytes((fo,)) + eo + po + + return substrate, False, True + + else: + raise error.PyAsn1Error('Prohibited Real base %s' % b) + + +class SequenceEncoder(AbstractItemEncoder): + omitEmptyOptionals = False + + # TODO: handling three flavors of input is too much -- split over codecs + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + + substrate = b'' + + omitEmptyOptionals = options.get( + 'omitEmptyOptionals', self.omitEmptyOptionals) + + if LOG: + LOG('%sencoding empty OPTIONAL components' % ( + omitEmptyOptionals and 'not ' or '')) + + if asn1Spec is None: + # instance of ASN.1 schema + inconsistency = value.isInconsistent + if inconsistency: + raise error.PyAsn1Error( + f"ASN.1 object {value.__class__.__name__} is inconsistent") + + namedTypes = value.componentType + + for idx, component in enumerate(value.values()): + if namedTypes: + namedType = namedTypes[idx] + + if namedType.isOptional and not component.isValue: + if LOG: + LOG('not encoding OPTIONAL component %r' % (namedType,)) + continue + + if namedType.isDefaulted and component == namedType.asn1Object: + if LOG: + LOG('not encoding DEFAULT component %r' % (namedType,)) + continue + + if omitEmptyOptionals: + options.update(ifNotEmpty=namedType.isOptional) + + # wrap open type blob if needed + if namedTypes and namedType.openType: + + wrapType = namedType.asn1Object + + if wrapType.typeId in ( + univ.SetOf.typeId, univ.SequenceOf.typeId): + + substrate += encodeFun( + component, asn1Spec, + **dict(options, wrapType=wrapType.componentType)) + + else: + chunk = encodeFun(component, asn1Spec, **options) + + if wrapType.isSameTypeWith(component): + substrate += chunk + + else: + substrate += encodeFun(chunk, wrapType, **options) + + if LOG: + LOG('wrapped with wrap type %r' % (wrapType,)) + + else: + substrate += encodeFun(component, asn1Spec, **options) + + else: + # bare Python value + ASN.1 schema + for idx, namedType in enumerate(asn1Spec.componentType.namedTypes): + + try: + component = value[namedType.name] + + except KeyError: + raise error.PyAsn1Error('Component name "%s" not found in %r' % ( + namedType.name, value)) + + if namedType.isOptional and namedType.name not in value: + if LOG: + LOG('not encoding OPTIONAL component %r' % (namedType,)) + continue + + if namedType.isDefaulted and component == namedType.asn1Object: + if LOG: + LOG('not encoding DEFAULT component %r' % (namedType,)) + continue + + if omitEmptyOptionals: + options.update(ifNotEmpty=namedType.isOptional) + + componentSpec = namedType.asn1Object + + # wrap open type blob if needed + if namedType.openType: + + if componentSpec.typeId in ( + univ.SetOf.typeId, univ.SequenceOf.typeId): + + substrate += encodeFun( + component, componentSpec, + **dict(options, wrapType=componentSpec.componentType)) + + else: + chunk = encodeFun(component, componentSpec, **options) + + if componentSpec.isSameTypeWith(component): + substrate += chunk + + else: + substrate += encodeFun(chunk, componentSpec, **options) + + if LOG: + LOG('wrapped with wrap type %r' % (componentSpec,)) + + else: + substrate += encodeFun(component, componentSpec, **options) + + return substrate, True, True + + +class SequenceOfEncoder(AbstractItemEncoder): + def _encodeComponents(self, value, asn1Spec, encodeFun, **options): + + if asn1Spec is None: + inconsistency = value.isInconsistent + if inconsistency: + raise error.PyAsn1Error( + f"ASN.1 object {value.__class__.__name__} is inconsistent") + + else: + asn1Spec = asn1Spec.componentType + + chunks = [] + + wrapType = options.pop('wrapType', None) + + for idx, component in enumerate(value): + chunk = encodeFun(component, asn1Spec, **options) + + if (wrapType is not None and + not wrapType.isSameTypeWith(component)): + # wrap encoded value with wrapper container (e.g. ANY) + chunk = encodeFun(chunk, wrapType, **options) + + if LOG: + LOG('wrapped with wrap type %r' % (wrapType,)) + + chunks.append(chunk) + + return chunks + + def encodeValue(self, value, asn1Spec, encodeFun, **options): + chunks = self._encodeComponents( + value, asn1Spec, encodeFun, **options) + + return b''.join(chunks), True, True + + +class ChoiceEncoder(AbstractItemEncoder): + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if asn1Spec is None: + component = value.getComponent() + else: + names = [namedType.name for namedType in asn1Spec.componentType.namedTypes + if namedType.name in value] + if len(names) != 1: + raise error.PyAsn1Error('%s components for Choice at %r' % (len(names) and 'Multiple ' or 'None ', value)) + + name = names[0] + + component = value[name] + asn1Spec = asn1Spec[name] + + return encodeFun(component, asn1Spec, **options), True, True + + +class AnyEncoder(OctetStringEncoder): + def encodeValue(self, value, asn1Spec, encodeFun, **options): + if asn1Spec is None: + value = value.asOctets() + elif not isinstance(value, bytes): + value = asn1Spec.clone(value).asOctets() + + return value, not options.get('defMode', True), True + + +TAG_MAP = { + eoo.endOfOctets.tagSet: EndOfOctetsEncoder(), + univ.Boolean.tagSet: BooleanEncoder(), + univ.Integer.tagSet: IntegerEncoder(), + univ.BitString.tagSet: BitStringEncoder(), + univ.OctetString.tagSet: OctetStringEncoder(), + univ.Null.tagSet: NullEncoder(), + univ.ObjectIdentifier.tagSet: ObjectIdentifierEncoder(), + univ.RelativeOID.tagSet: RelativeOIDEncoder(), + univ.Enumerated.tagSet: IntegerEncoder(), + univ.Real.tagSet: RealEncoder(), + # Sequence & Set have same tags as SequenceOf & SetOf + univ.SequenceOf.tagSet: SequenceOfEncoder(), + univ.SetOf.tagSet: SequenceOfEncoder(), + univ.Choice.tagSet: ChoiceEncoder(), + # character string types + char.UTF8String.tagSet: OctetStringEncoder(), + char.NumericString.tagSet: OctetStringEncoder(), + char.PrintableString.tagSet: OctetStringEncoder(), + char.TeletexString.tagSet: OctetStringEncoder(), + char.VideotexString.tagSet: OctetStringEncoder(), + char.IA5String.tagSet: OctetStringEncoder(), + char.GraphicString.tagSet: OctetStringEncoder(), + char.VisibleString.tagSet: OctetStringEncoder(), + char.GeneralString.tagSet: OctetStringEncoder(), + char.UniversalString.tagSet: OctetStringEncoder(), + char.BMPString.tagSet: OctetStringEncoder(), + # useful types + useful.ObjectDescriptor.tagSet: OctetStringEncoder(), + useful.GeneralizedTime.tagSet: OctetStringEncoder(), + useful.UTCTime.tagSet: OctetStringEncoder() +} + +# Put in ambiguous & non-ambiguous types for faster codec lookup +TYPE_MAP = { + univ.Boolean.typeId: BooleanEncoder(), + univ.Integer.typeId: IntegerEncoder(), + univ.BitString.typeId: BitStringEncoder(), + univ.OctetString.typeId: OctetStringEncoder(), + univ.Null.typeId: NullEncoder(), + univ.ObjectIdentifier.typeId: ObjectIdentifierEncoder(), + univ.RelativeOID.typeId: RelativeOIDEncoder(), + univ.Enumerated.typeId: IntegerEncoder(), + univ.Real.typeId: RealEncoder(), + # Sequence & Set have same tags as SequenceOf & SetOf + univ.Set.typeId: SequenceEncoder(), + univ.SetOf.typeId: SequenceOfEncoder(), + univ.Sequence.typeId: SequenceEncoder(), + univ.SequenceOf.typeId: SequenceOfEncoder(), + univ.Choice.typeId: ChoiceEncoder(), + univ.Any.typeId: AnyEncoder(), + # character string types + char.UTF8String.typeId: OctetStringEncoder(), + char.NumericString.typeId: OctetStringEncoder(), + char.PrintableString.typeId: OctetStringEncoder(), + char.TeletexString.typeId: OctetStringEncoder(), + char.VideotexString.typeId: OctetStringEncoder(), + char.IA5String.typeId: OctetStringEncoder(), + char.GraphicString.typeId: OctetStringEncoder(), + char.VisibleString.typeId: OctetStringEncoder(), + char.GeneralString.typeId: OctetStringEncoder(), + char.UniversalString.typeId: OctetStringEncoder(), + char.BMPString.typeId: OctetStringEncoder(), + # useful types + useful.ObjectDescriptor.typeId: OctetStringEncoder(), + useful.GeneralizedTime.typeId: OctetStringEncoder(), + useful.UTCTime.typeId: OctetStringEncoder() +} + + +class SingleItemEncoder(object): + fixedDefLengthMode = None + fixedChunkSize = None + + TAG_MAP = TAG_MAP + TYPE_MAP = TYPE_MAP + + def __init__(self, tagMap=_MISSING, typeMap=_MISSING, **ignored): + self._tagMap = tagMap if tagMap is not _MISSING else self.TAG_MAP + self._typeMap = typeMap if typeMap is not _MISSING else self.TYPE_MAP + + def __call__(self, value, asn1Spec=None, **options): + try: + if asn1Spec is None: + typeId = value.typeId + else: + typeId = asn1Spec.typeId + + except AttributeError: + raise error.PyAsn1Error('Value %r is not ASN.1 type instance ' + 'and "asn1Spec" not given' % (value,)) + + if LOG: + LOG('encoder called in %sdef mode, chunk size %s for type %s, ' + 'value:\n%s' % (not options.get('defMode', True) and 'in' or '', + options.get('maxChunkSize', 0), + asn1Spec is None and value.prettyPrintType() or + asn1Spec.prettyPrintType(), value)) + + if self.fixedDefLengthMode is not None: + options.update(defMode=self.fixedDefLengthMode) + + if self.fixedChunkSize is not None: + options.update(maxChunkSize=self.fixedChunkSize) + + try: + concreteEncoder = self._typeMap[typeId] + + if LOG: + LOG('using value codec %s chosen by type ID ' + '%s' % (concreteEncoder.__class__.__name__, typeId)) + + except KeyError: + if asn1Spec is None: + tagSet = value.tagSet + else: + tagSet = asn1Spec.tagSet + + # use base type for codec lookup to recover untagged types + baseTagSet = tag.TagSet(tagSet.baseTag, tagSet.baseTag) + + try: + concreteEncoder = self._tagMap[baseTagSet] + + except KeyError: + raise error.PyAsn1Error('No encoder for %r (%s)' % (value, tagSet)) + + if LOG: + LOG('using value codec %s chosen by tagSet ' + '%s' % (concreteEncoder.__class__.__name__, tagSet)) + + substrate = concreteEncoder.encode(value, asn1Spec, self, **options) + + if LOG: + LOG('codec %s built %s octets of substrate: %s\nencoder ' + 'completed' % (concreteEncoder, len(substrate), + debug.hexdump(substrate))) + + return substrate + + +class Encoder(object): + SINGLE_ITEM_ENCODER = SingleItemEncoder + + def __init__(self, tagMap=_MISSING, typeMap=_MISSING, **options): + self._singleItemEncoder = self.SINGLE_ITEM_ENCODER( + tagMap=tagMap, typeMap=typeMap, **options + ) + + def __call__(self, pyObject, asn1Spec=None, **options): + return self._singleItemEncoder( + pyObject, asn1Spec=asn1Spec, **options) + + +#: Turns ASN.1 object into BER octet stream. +#: +#: Takes any ASN.1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative) +#: walks all its components recursively and produces a BER octet stream. +#: +#: Parameters +#: ---------- +#: value: either a Python or pyasn1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative) +#: A Python or pyasn1 object to encode. If Python object is given, `asnSpec` +#: parameter is required to guide the encoding process. +#: +#: Keyword Args +#: ------------ +#: asn1Spec: +#: Optional ASN.1 schema or value object e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative +#: +#: defMode: :py:class:`bool` +#: If :obj:`False`, produces indefinite length encoding +#: +#: maxChunkSize: :py:class:`int` +#: Maximum chunk size in chunked encoding mode (0 denotes unlimited chunk size) +#: +#: Returns +#: ------- +#: : :py:class:`bytes` +#: Given ASN.1 object encoded into BER octetstream +#: +#: Raises +#: ------ +#: ~pyasn1.error.PyAsn1Error +#: On encoding errors +#: +#: Examples +#: -------- +#: Encode Python value into BER with ASN.1 schema +#: +#: .. code-block:: pycon +#: +#: >>> seq = SequenceOf(componentType=Integer()) +#: >>> encode([1, 2, 3], asn1Spec=seq) +#: b'0\t\x02\x01\x01\x02\x01\x02\x02\x01\x03' +#: +#: Encode ASN.1 value object into BER +#: +#: .. code-block:: pycon +#: +#: >>> seq = SequenceOf(componentType=Integer()) +#: >>> seq.extend([1, 2, 3]) +#: >>> encode(seq) +#: b'0\t\x02\x01\x01\x02\x01\x02\x02\x01\x03' +#: +encode = Encoder() + +def __getattr__(attr: str): + if newAttr := {"tagMap": "TAG_MAP", "typeMap": "TYPE_MAP"}.get(attr): + warnings.warn(f"{attr} is deprecated. Please use {newAttr} instead.", DeprecationWarning) + return globals()[newAttr] + raise AttributeError(attr) |