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decoder.py
# # This file is part of pyasn1 software. # # Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com> # License: http://pyasn1.sf.net/license.html # from pyasn1.type import base, univ, char, useful, tag from pyasn1 import debug, error __all__ = ['decode'] class AbstractScalarDecoder(object): def __call__(self, pyObject, asn1Spec, decodeFun=None, **options): return asn1Spec.clone(pyObject) class BitStringDecoder(AbstractScalarDecoder): def __call__(self, pyObject, asn1Spec, decodeFun=None, **options): return asn1Spec.clone(univ.BitString.fromBinaryString(pyObject)) class SequenceOrSetDecoder(object): def __call__(self, pyObject, asn1Spec, decodeFun=None, **options): asn1Value = asn1Spec.clone() componentsTypes = asn1Spec.componentType for field in asn1Value: if field in pyObject: asn1Value[field] = decodeFun(pyObject[field], componentsTypes[field].asn1Object, **options) return asn1Value class SequenceOfOrSetOfDecoder(object): def __call__(self, pyObject, asn1Spec, decodeFun=None, **options): asn1Value = asn1Spec.clone() for pyValue in pyObject: asn1Value.append(decodeFun(pyValue, asn1Spec.componentType), **options) return asn1Value class ChoiceDecoder(object): def __call__(self, pyObject, asn1Spec, decodeFun=None, **options): asn1Value = asn1Spec.clone() componentsTypes = asn1Spec.componentType for field in pyObject: if field in componentsTypes: asn1Value[field] = decodeFun(pyObject[field], componentsTypes[field].asn1Object, **options) break return asn1Value tagMap = { univ.Integer.tagSet: AbstractScalarDecoder(), univ.Boolean.tagSet: AbstractScalarDecoder(), univ.BitString.tagSet: BitStringDecoder(), univ.OctetString.tagSet: AbstractScalarDecoder(), univ.Null.tagSet: AbstractScalarDecoder(), univ.ObjectIdentifier.tagSet: AbstractScalarDecoder(), univ.Enumerated.tagSet: AbstractScalarDecoder(), univ.Real.tagSet: AbstractScalarDecoder(), univ.Sequence.tagSet: SequenceOrSetDecoder(), # conflicts with SequenceOf univ.Set.tagSet: SequenceOrSetDecoder(), # conflicts with SetOf univ.Choice.tagSet: ChoiceDecoder(), # conflicts with Any # character string types char.UTF8String.tagSet: AbstractScalarDecoder(), char.NumericString.tagSet: AbstractScalarDecoder(), char.PrintableString.tagSet: AbstractScalarDecoder(), char.TeletexString.tagSet: AbstractScalarDecoder(), char.VideotexString.tagSet: AbstractScalarDecoder(), char.IA5String.tagSet: AbstractScalarDecoder(), char.GraphicString.tagSet: AbstractScalarDecoder(), char.VisibleString.tagSet: AbstractScalarDecoder(), char.GeneralString.tagSet: AbstractScalarDecoder(), char.UniversalString.tagSet: AbstractScalarDecoder(), char.BMPString.tagSet: AbstractScalarDecoder(), # useful types useful.ObjectDescriptor.tagSet: AbstractScalarDecoder(), useful.GeneralizedTime.tagSet: AbstractScalarDecoder(), useful.UTCTime.tagSet: AbstractScalarDecoder() } # Put in ambiguous & non-ambiguous types for faster codec lookup typeMap = { univ.Integer.typeId: AbstractScalarDecoder(), univ.Boolean.typeId: AbstractScalarDecoder(), univ.BitString.typeId: BitStringDecoder(), univ.OctetString.typeId: AbstractScalarDecoder(), univ.Null.typeId: AbstractScalarDecoder(), univ.ObjectIdentifier.typeId: AbstractScalarDecoder(), univ.Enumerated.typeId: AbstractScalarDecoder(), univ.Real.typeId: AbstractScalarDecoder(), # ambiguous base types univ.Set.typeId: SequenceOrSetDecoder(), univ.SetOf.typeId: SequenceOfOrSetOfDecoder(), univ.Sequence.typeId: SequenceOrSetDecoder(), univ.SequenceOf.typeId: SequenceOfOrSetOfDecoder(), univ.Choice.typeId: ChoiceDecoder(), univ.Any.typeId: AbstractScalarDecoder(), # character string types char.UTF8String.typeId: AbstractScalarDecoder(), char.NumericString.typeId: AbstractScalarDecoder(), char.PrintableString.typeId: AbstractScalarDecoder(), char.TeletexString.typeId: AbstractScalarDecoder(), char.VideotexString.typeId: AbstractScalarDecoder(), char.IA5String.typeId: AbstractScalarDecoder(), char.GraphicString.typeId: AbstractScalarDecoder(), char.VisibleString.typeId: AbstractScalarDecoder(), char.GeneralString.typeId: AbstractScalarDecoder(), char.UniversalString.typeId: AbstractScalarDecoder(), char.BMPString.typeId: AbstractScalarDecoder(), # useful types useful.ObjectDescriptor.typeId: AbstractScalarDecoder(), useful.GeneralizedTime.typeId: AbstractScalarDecoder(), useful.UTCTime.typeId: AbstractScalarDecoder() } class Decoder(object): # noinspection PyDefaultArgument def __init__(self, tagMap, typeMap): self.__tagMap = tagMap self.__typeMap = typeMap def __call__(self, pyObject, asn1Spec, **options): if debug.logger & debug.flagDecoder: logger = debug.logger else: logger = None if logger: debug.scope.push(type(pyObject).__name__) logger('decoder called at scope %s, working with type %s' % (debug.scope, type(pyObject).__name__)) if asn1Spec is None or not isinstance(asn1Spec, base.Asn1Item): raise error.PyAsn1Error('asn1Spec is not valid (should be an instance of an ASN.1 Item, not %s)' % asn1Spec.__class__.__name__) try: valueDecoder = self.__typeMap[asn1Spec.typeId] except KeyError: # use base type for codec lookup to recover untagged types baseTagSet = tag.TagSet(asn1Spec.tagSet.baseTag, asn1Spec.tagSet.baseTag) try: valueDecoder = self.__tagMap[baseTagSet] except KeyError: raise error.PyAsn1Error('Unknown ASN.1 tag %s' % asn1Spec.tagSet) if logger: logger('calling decoder %s on Python type %s <%s>' % (type(valueDecoder).__name__, type(pyObject).__name__, repr(pyObject))) value = valueDecoder(pyObject, asn1Spec, self, **options) if logger: logger('decoder %s produced ASN.1 type %s <%s>' % (type(valueDecoder).__name__, type(value).__name__, repr(value))) debug.scope.pop() return value #: Turns Python objects of built-in types into ASN.1 objects. #: #: Takes Python objects of built-in types and turns them into a tree of #: ASN.1 objects (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative) which #: may be a scalar or an arbitrary nested structure. #: #: Parameters #: ---------- #: pyObject: :py:class:`object` #: A scalar or nested Python objects #: #: asn1Spec: any pyasn1 type object e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative #: A pyasn1 type object to act as a template guiding the decoder. It is required #: for successful interpretation of Python objects mapping into their ASN.1 #: representations. #: #: Returns #: ------- #: : :py:class:`~pyasn1.type.base.PyAsn1Item` derivative #: A scalar or constructed pyasn1 object #: #: Raises #: ------ #: : :py:class:`pyasn1.error.PyAsn1Error` #: On decoding errors decode = Decoder(tagMap, typeMap)
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