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@doronz88
Last active May 3, 2025 15:25
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Convert between ios14 and ios13 arm64e cpu subtypes for all mach-o in a given directory
import sys
from pathlib import Path
MH_MAGIC_64 = b'\xcf\xfa\xed\xfe'
CPU_TYPE_ARM64 = b'\x0c\x00\x00\x01'
CPU_SUBTYPE_IOS13 = b'\x02\x00\x00\x00'
CPU_SUBTYPE_IOS14 = b'\x02\x00\x00\x80'
IOS13_HEADER = MH_MAGIC_64 + CPU_TYPE_ARM64 + CPU_SUBTYPE_IOS13
IOS14_HEADER = MH_MAGIC_64 + CPU_TYPE_ARM64 + CPU_SUBTYPE_IOS14
HEADER_LEN = len(IOS13_HEADER)
def handle_file(file):
buf = file.read_bytes()
if len(buf) < HEADER_LEN:
return
header = buf[:HEADER_LEN]
buf = buf[HEADER_LEN:]
if header == IOS13_HEADER:
print(f'converting "{file.name}" from ios13 arm64e subtype to ios14')
file.write_bytes(IOS14_HEADER + buf)
elif header == IOS14_HEADER:
print(f'converting "{file.name}" from ios14 arm64e subtype to ios13')
file.write_bytes(IOS13_HEADER + buf)
def main():
if len(sys.argv) != 2:
print(f'USAGE: {sys.argv[0]} <path>')
return
path = sys.argv[1]
path = Path(path)
if path.is_dir():
for file in path.glob('**/*'):
if not file.is_file():
continue
handle_file(file)
else:
handle_file(path)
print('done.')
if __name__ == '__main__':
main()
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