encoder.py 文件源码

def encodeValue(self, encodeFun, value, defMode, maxChunkSize, ifNotEmpty=False):
        value.verifySizeSpec()
        substrate = null
        idx = len(value)
        # This is certainly a hack but how else do I distinguish SetOf
        # from Set if they have the same tags&constraints?
        if isinstance(value, univ.SequenceAndSetBase):
            # Set
            namedTypes = value.componentType
            comps = []
            compsMap = {}
            while idx > 0:
                idx -= 1
                if namedTypes:
                    if namedTypes[idx].isOptional and not value[idx].isValue:
                        continue
                    if namedTypes[idx].isDefaulted and value[idx] == namedTypes[idx].asn1Object:
                        continue

                comps.append(value[idx])
                compsMap[id(value[idx])] = namedTypes[idx].isOptional

            for comp in self._sortComponents(comps):
                substrate += encodeFun(comp, defMode, maxChunkSize, ifNotEmpty=compsMap[id(comp)])
        else:
            # SetOf
            compSubs = []
            while idx > 0:
                idx -= 1
                compSubs.append(
                    encodeFun(value[idx], defMode, maxChunkSize)
                )
            compSubs.sort()  # perhaps padding's not needed
            substrate = null
            for compSub in compSubs:
                substrate += compSub
        return substrate, True, True