########################
# Tested with Python 2.7
# udd file version 1.1
#######################

import os, sys
import struct
import datetime

def FindUs(f, data): # get offset and comments
    index, key = FindKey(data)
    while index: 
        f.seek(index + 7)
        offset = f.read(4)
        hexstr = hex(struct.unpack('I', offset)[0])        
        Writefile(hexstr + '\t\t' + f.readline()[:-2] + \
                  '[*User*]' * (key == 'Us6'), output)  # *User* for User comments       
        data = data.replace(key, 'XXX', 1)
        index, key = FindKey(data)
def Writefile(string, f):
    f.writelines(string + '\r\n')
    
def FindKey(data):
    index_c = data.find('Us:') # OD generated comments
    index_u = data.find('Us6') # User added comments

    if index_c == -1 and index_u == -1:
        return None, None
    elif index_c < index_u or index_u == -1:
        return index_c, 'Us:'
    else:
        return index_u, 'Us6'

def PrintHeader(f, data): # generate the header
    f.seek(8)
    v_str = f.read(21)
    Writefile('"'* 40, output)
    Writefile(v_str, output)
    Writefile('Generated on ' + datetime.datetime.now().strftime('%Y-%m-%d %H:%M'), output)
    Writefile('"' * 40 + '\r\n', output)
        
if __name__ == '__main__':
    try:
        udd_file = sys.argv[1] # get parameter as file
        f = open(udd_file, 'rb')

        data = f.read() # read file as string
        output = open(udd_file + '.txt','w') # create a new file
        Writefile('FileName: ' + udd_file, output)
        
        PrintHeader(f, data)
        Writefile ('Offset\t\t' + 'Comments', output)
        Writefile('======'.ljust(20) + ('='* 25).ljust(50), output)

        FindUs(f, data)        
        Writefile('\r\n[END OF FILE]', output) # File is done
        
        f.close()
        output.close()
        sys.exit(0)
        
    except:
        raise