Method valueDecoder

pager_lib/pyasn1/codec/ber/decoder.py:1306–1345

(self, substrate, asn1Spec,
                     tagSet=None, length=None, state=None,
                     decodeFun=None, substrateFun=None,
                     **options)

    protoComponent = univ.Any()

    def valueDecoder(self, substrate, asn1Spec,
                     tagSet=None, length=None, state=None,
                     decodeFun=None, substrateFun=None,
                     **options):
        if asn1Spec is None:
            isUntagged = True

        elif asn1Spec.__class__ is tagmap.TagMap:
            isUntagged = tagSet not in asn1Spec.tagMap

        else:
            isUntagged = tagSet != asn1Spec.tagSet

        if isUntagged:
            fullPosition = substrate.markedPosition
            currentPosition = substrate.tell()

            substrate.seek(fullPosition, os.SEEK_SET)
            length += currentPosition - fullPosition

            if LOG:
                for chunk in peekIntoStream(substrate, length):
                    if isinstance(chunk, SubstrateUnderrunError):
                        yield chunk
                LOG('decoding as untagged ANY, substrate '
                    '%s' % debug.hexdump(chunk))

        if substrateFun:
            for chunk in substrateFun(
                    self._createComponent(asn1Spec, tagSet, noValue, **options),
                    substrate, length, options):
                yield chunk

            return

        for chunk in readFromStream(substrate, length, options):
            if isinstance(chunk, SubstrateUnderrunError):
                yield chunk

        yield self._createComponent(asn1Spec, tagSet, chunk, **options)

    def indefLenValueDecoder(self, substrate, asn1Spec,
                             tagSet=None, length=None, state=None,