XCode path mangling in python

xcrun.py

import struct, hashlib

def hashStringForPath(cls, path):
        hash_path = [None] * 28;
        md5_digest_hex = hashlib.md5(path).digest();
        first_value = struct.unpack('>Q', md5_digest_hex[:8])[0];
        second_value = struct.unpack('>Q', md5_digest_hex[8:])[0];
        
        counter = 13;
        while counter >= 0:
            hash_path[counter] = chr((first_value % 26) + ord('a'));
            first_value = first_value / 26;
            counter -= 1;
        
        counter = 27;
        while counter > 13:
            hash_path[counter] = chr((second_value % 26) + ord('a'));
            second_value = second_value / 26;
            counter -= 1;
        
        return ''.join(hash_path);