decoder.py 文件源码

def indefLenValueDecoder(self, substrate, asn1Spec,
                             tagSet=None, length=None, state=None,
                             decodeFun=None, substrateFun=None,
                             **options):
        if asn1Spec is not None and tagSet == asn1Spec.tagSet:
            # tagged Any type -- consume header substrate
            header = null
        else:
            fullSubstrate = options['fullSubstrate']

            # untagged Any, recover header substrate
            header = fullSubstrate[:-len(substrate)]

        # Any components do not inherit initial tag
        asn1Spec = self.protoComponent

        if substrateFun and substrateFun is not self.substrateCollector:
            asn1Object = self._createComponent(asn1Spec, tagSet)
            return substrateFun(asn1Object, header + substrate, length + len(header))

        # All inner fragments are of the same type, treat them as octet string
        substrateFun = self.substrateCollector

        while substrate:
            component, substrate = decodeFun(substrate, asn1Spec,
                                             substrateFun=substrateFun,
                                             allowEoo=True, **options)
            if component is eoo.endOfOctets:
                break
            header += component
        else:
            raise error.SubstrateUnderrunError(
                'No EOO seen before substrate ends'
            )
        if substrateFun:
            return header, substrate
        else:
            return self._createComponent(asn1Spec, tagSet, header), substrate


# character string types