mirror of
https://github.com/projectPiki/pikmin2.git
synced 2024-11-24 05:49:58 +00:00
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
#! /usr/bin/env python3
|
|
|
|
# Written by Ethan Roseman (ethteck)
|
|
# MIT License
|
|
# Copyright 2021
|
|
|
|
# Modified by EpochFlame
|
|
|
|
import argparse
|
|
|
|
# Byte sequence that marks code size
|
|
CODESIZE_MAGIC = b"\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00\x34"
|
|
BLR_BYTE_SEQ = b"\x4E\x80\x00\x20"
|
|
MTLR_BYTE_SEQ = b"\x7C\x08\x03\xA6"
|
|
|
|
# Example invocation: ./frank.py vanilla.o profile.o output.o
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument("vanilla", help="Path to the vanilla object", type=argparse.FileType('rb'))
|
|
parser.add_argument("target", help="Path to the target object (to write)")
|
|
|
|
args = parser.parse_args()
|
|
|
|
# Read contents into bytearrays and close files
|
|
vanilla_bytes = args.vanilla.read()
|
|
args.vanilla.close()
|
|
|
|
# Reunify mtlr/blr instructions, shifting intermediary instructions up
|
|
idx = 0
|
|
|
|
while idx < len(vanilla_bytes):
|
|
# Find mtlr position
|
|
mtlr_found_pos = vanilla_bytes.find(MTLR_BYTE_SEQ, idx)
|
|
if mtlr_found_pos == -1:
|
|
break # break while loop when no targets remain
|
|
if mtlr_found_pos % 4 != 0: # check 4-byte alignment
|
|
idx += 4
|
|
continue
|
|
# Find paired blr position
|
|
blr_found_pos = vanilla_bytes.find(BLR_BYTE_SEQ, mtlr_found_pos)
|
|
if blr_found_pos == -1:
|
|
break # break while loop when no targets remain
|
|
if blr_found_pos % 4 != 0: # check 4-byte alignment
|
|
idx += 4
|
|
continue
|
|
if mtlr_found_pos + 4 == blr_found_pos:
|
|
idx += 4
|
|
continue # continue if mtlr is followed directly by blr
|
|
|
|
vanilla_bytes = vanilla_bytes[:mtlr_found_pos] + vanilla_bytes[mtlr_found_pos+4:blr_found_pos] + vanilla_bytes[mtlr_found_pos:mtlr_found_pos+4] + vanilla_bytes[blr_found_pos:]
|
|
idx = mtlr_found_pos + len(MTLR_BYTE_SEQ)
|
|
|
|
with open(args.target, "wb") as f:
|
|
f.write(vanilla_bytes)
|