decoder.py 文件源码

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                     length, state, decodeFun, substrateFun):
        if asn1Spec is None or \
               asn1Spec is not None and tagSet != asn1Spec.getTagSet():
            # untagged Any container, recover inner header substrate
            length = length + len(fullSubstrate) - len(substrate)
            substrate = fullSubstrate
        if substrateFun:
            return substrateFun(self._createComponent(asn1Spec, tagSet),
                                substrate, length)
        head, tail = substrate[:length], substrate[length:]
        return self._createComponent(asn1Spec, tagSet, value=head), tail