drsuapi.py 文件源码

def OidFromAttid(prefixTable, attr):
    # separate the ATTRTYP into two parts
    upperWord = attr / 65536
    lowerWord = attr % 65536

    # search in the prefix table to find the upperWord, if found,
    # construct the binary OID by appending lowerWord to the end of
    # found prefix.

    binaryOID = None
    for j, item in enumerate(prefixTable):
        if item['ndx'] == upperWord:
            binaryOID = item['prefix']['elements'][:item['prefix']['length']]
            if lowerWord < 128:
                binaryOID.append(chr(lowerWord))
            else:
                if lowerWord >= 32768:
                    lowerWord -= 32768
                binaryOID.append(chr(((lowerWord/128) % 128)+128))
                binaryOID.append(chr(lowerWord%128))
            break

    if binaryOID is None:
        return None

    return str(decoder.decode('\x06' + chr(len(binaryOID)) + ''.join(binaryOID), asn1Spec = univ.ObjectIdentifier())[0])