ZnK ItemTool v1

import struct
import os

def get_data(filename):
    totalbytes = os.path.getsize(filename)
    infile = open(filename, 'rb')
    totalfiledata = infile.read(totalbytes)
    return totalfiledata

def replacestr(origstr,replacestr,startpos,replacelen):
#Returns a string with a replaced sub-string
#origstr - the original string, replacestr = the string to replace
#startpos - where the replacement string should go
#replacelen - how many characters of the original string to replace
    return origstr[:startpos] + replacestr + origstr[startpos+replacelen:]

infile = 't_ittxt.data'
infile1 = 't_ittxt.orig'
origfiledata = get_data(infile1)
outfiledata = get_data(infile1)

tblindex = 0x16
offset = 0
inputindex = 0
lasttblpointer = 0x0
inputdata = []

#Read the input file
with open(infile) as f:
    for line in f:
        inputdata.append(line.split('\t'))

while True:
#Break out of the loop if at end of pointers
    if outfiledata[tblindex:tblindex+2] == '\x00\x00':
        break
    if inputindex == len(inputdata):
        break

    origpointer = struct.unpack('<H',origfiledata[tblindex:tblindex+2])[0]+8
    if origpointer != lasttblpointer:
        lasttblpointer = origpointer
    #Unpack pointer, add offset
        tblpointer = struct.unpack('<H',outfiledata[tblindex:tblindex+2])[0] + offset
    #Rewrite the pointer
        outfiledata = outfiledata[:tblindex] + struct.pack('<H',tblpointer) + outfiledata[tblindex+2:]

        itemnamepointer = tblpointer + 8 #The first pointer.
        itemdescriptionpointer = itemnamepointer + len(inputdata[inputindex][1])
        code = struct.pack('<H',itemnamepointer) + struct.pack('<H',itemdescriptionpointer)


        origend = origfiledata.find('\x00',origpointer)
        origend = origfiledata.find('\x00',origend+1)
        origlength = origend-origpointer

        if inputdata[inputindex+1][0] != "": #A 1-length record (one line long)
            code += inputdata[inputindex][1][:-1] + '\x00' + " "
            inputindex += 1
        elif inputdata[inputindex+2][0] != "": #2-length record
            code += inputdata[inputindex][1][:-1] + '\x00' + inputdata[inputindex+1][1][:-1]
            inputindex += 2
        else: #3-length record
            code += inputdata[inputindex][1][:-1] + '\x00' + inputdata[inputindex+1][1][:-1] + inputdata[inputindex+2][1][:-1]
            inputindex += 3

        newlength = len(code) - 4
        oldoffset = offset
        offset += newlength - origlength

        outfiledata = replacestr(outfiledata,code,tblpointer + 4,origlength + 4)
    else:
    #Unpack pointer, add offset
        tblpointer = struct.unpack('<H',outfiledata[tblindex:tblindex+2])[0] + oldoffset
    #Rewrite the pointer
        outfiledata = outfiledata[:tblindex] + struct.pack('<H',tblpointer) + outfiledata[tblindex+2:]

    tblindex += 2

outfile = open('t_ittxt._dt','wb')
outfile.write(outfiledata) #write the output
outfile.close()