Atmosphere/exosphere/program/split_program.py
2020-06-14 22:07:45 -07:00

33 lines
1.1 KiB
Python

#!/usr/bin/env python
import sys, lz4
from struct import unpack as up
def lz4_compress(data):
return lz4.block.compress(data, 'high_compression', store_size=False)
def split_binary(data):
A, B, START, BOOT_CODE_START, BOOT_CODE_END, PROGRAM_START, C, D = up('<QQQQQQQQ', data[:0x40])
assert A == 0xAAAAAAAAAAAAAAAA
assert B == 0xBBBBBBBBBBBBBBBB
assert C == 0xCCCCCCCCCCCCCCCC
assert D == 0xDDDDDDDDDDDDDDDD
data = data[0x40:]
boot_code = data[BOOT_CODE_START - START:BOOT_CODE_END - BOOT_CODE_START]
program = data[PROGRAM_START - START:]
return [('boot_code.lz4', lz4_compress(boot_code)), ('program.lz4', lz4_compress(program))]
def main(argc, argv):
if argc != 3:
print 'Usage: %s in outdir' % argv[0]
return 1
with open(argv[1], 'rb') as f:
data = f.read()
assert len(data) >= 0x40
for (fn, fdata) in split_binary(data):
with open('%s/%s' % (argv[2], fn), 'wb') as f:
f.write(fdata)
return 0
if __name__ == '__main__':
sys.exit(main(len(sys.argv), sys.argv))