ACLR Test Patcher v2

import os
import shutil
import subprocess
import tempfile
import zlib

replace_list = [('006cc000', 0x6CC000, 25553321, 0x1FAA800,),
                ('09880800', 0x9880800, 13533, 0x09884000),
                ('0c780800', 0xC780800, 15855, 0x0C784800),
                ('093ae800', 0x93AE800, 37749, 0x093B8000)]

def unzip(f, offset, size):
    saved = f.tell()
    f.seek(offset)
    with tempfile.NamedTemporaryFile(delete = False) as g:
        filename = g.name
        g.write(zlib.decompress(f.read(size)))
    f.seek(saved)
    return filename

#Make a copy of AC.BIN
if os.path.isfile('AC.orig'):
    pass
elif os.path.isfile('AC.BIN'):
    shutil.copy('AC.BIN', 'AC.orig')
else:
    print('File AC.BIN not found.')
    quit()

#Extract file and decompress
with open('AC.orig', 'rb') as f:
    with open('AC.BIN', 'wb') as g:
#Sort by sub-file address
        for name, offset, size, next_offset in sorted(replace_list, key = lambda x: x[1]):
            g.write(f.read(offset - g.tell()))          #Copy up to offset
            tempfilename = unzip(f, offset, size)       #Unzip file
            patched = '{}.BIN'.format(name)
#Apply patch using xdelta
            subprocess.run(['xdelta', '-d', '-s', tempfilename, '{}.xdelta'.format(name), patched])
            os.remove(tempfilename)                     #Delete temporary file
            with open(patched, 'rb') as h:              #Compress and write our patched file
                g.write(zlib.compress(h.read()))
            os.remove(patched)                          #Delete temporary file
            g.write(b'\x00' * (next_offset - g.tell())) #Write zeros up to start of next file
            f.seek(next_offset)                         #Align file pointer
        g.write(f.read())                               #Copy the rest of the file