decoder.py 文件源码

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                     length, state, decodeFun, substrateFun):
        head, tail = substrate[:length], substrate[length:]
        asn1Object = self._createComponent(asn1Spec, tagSet)
        if substrateFun:
            return substrateFun(asn1Object, substrate, length)
        if asn1Object.tagSet == tagSet:  # explicitly tagged Choice
            component, head = decodeFun(
                head, asn1Object.componentTagMap
            )
        else:
            component, head = decodeFun(
                head, asn1Object.componentTagMap, tagSet, length, state
            )
        effectiveTagSet = component.effectiveTagSet
        asn1Object.setComponentByType(
            effectiveTagSet, component,
            verifyConstraints=False,
            matchTags=False, matchConstraints=False,
            innerFlag=False
        )
        return asn1Object, tail