A small patcher to bypass protected Lua functions in World of Warcraft 1.12.1 client `WoW.exe`

patch.py

with open('WoW.exe', 'rb') as f:
    b = bytearray(f.read())

def apply_patch(name, search, patch):
    print("PATCHING", name)

    size = len(patch)
    orig = search[:size]
    if b.count(search) != 1:
        print("not a good patch", b.count(search))
        exit(1)

    offset = b.index(search)
    found = bytes(b[offset:offset+size])
    if found != orig:
        print("error, instruction not found")
        exit(1)

    print("ORIG", found)
    print("NEW", patch)

    b[offset:offset+size] = patch

name = "Skip protected check"
search = b'\x0f\x84\xb1\x00\x00\x00\x68\x90\x00\x00\x00'
patch = b'\xe9\xe1\x00\x00\x00\x90' # kstool x32 'jmp 0x00494b40; nop' 00494a5a
apply_patch(name, search, patch)

name = "Enable logging a"
search = b'\x74\x14\x8b\x86\x18\x01\x00\x00'
patch = b'\x90\x90' # kstool x32 'nop; nop' 0065aca2
apply_patch(name, search, patch)

name = "Enable logging b"
search = b'\x74\x14\x8b\x96\x18\x01\x00\x00'
patch = b'\x90\x90' # kstool x32 'nop; nop' 0065a771
apply_patch(name, search, patch)

with open('WoW-unprotected.exe', 'wb') as f:
    f.write(b)