decoder.py 文件源码

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                     length, state, decodeFun, substrateFun):
        head, tail = substrate[:length], substrate[length:]
        r = self._createComponent(asn1Spec, tagSet)
        if substrateFun:
            return substrateFun(r, substrate, length)
        if r.getTagSet() == tagSet: # explicitly tagged Choice
            component, head = decodeFun(
                head, r.getComponentTagMap()
                )
        else:
            component, head = decodeFun(
                head, r.getComponentTagMap(), tagSet, length, state
                )
        if isinstance(component, univ.Choice):
            effectiveTagSet = component.getEffectiveTagSet()
        else:
            effectiveTagSet = component.getTagSet()
        r.setComponentByType(effectiveTagSet, component, 0, asn1Spec is None)
        return r, tail