mirror of
https://github.com/notwa/mm
synced 2024-11-05 04:19:03 -08:00
87 lines
2.2 KiB
Python
Executable file
87 lines
2.2 KiB
Python
Executable file
#!/usr/bin/env python3
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# fixes the checksums in a Majora's Mask savefile for Bizhawk
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# note: copies are ignored and overwritten, so don't bother editing them.
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import sys
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from util import R2, W2, swap_order
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lament = lambda *args, **kwargs: print(*args, file=sys.stderr, **kwargs)
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MAX16 = 0xFFFF
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chksum_offset = 0x100A
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save_size = 0x2000
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owl_size = 0x4000
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save_1 = (0x20800, save_size)
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save_2 = (0x24800, save_size)
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owl_1 = (0x28800, owl_size)
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owl_2 = (0x30800, owl_size)
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save_1_copy = (0x22800, save_size)
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save_2_copy = (0x26800, save_size)
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owl_1_copy = (0x2C800, owl_size)
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owl_2_copy = (0x34800, owl_size)
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def calc_sum(data):
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chksum = 0
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for b in data:
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chksum += b
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chksum &= MAX16
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return chksum
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def fix_sum(f, save, owl=False):
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f.seek(save[0])
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data = f.read(save[1])
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chksum = calc_sum(data[:chksum_offset])
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if owl and data != b'\x00'*len(data):
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chksum += 0x24 # don't know why
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chksum &= MAX16
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f.seek(save[0] + chksum_offset)
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old_chksum = R2(f.read(2))
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f.seek(save[0] + chksum_offset)
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f.write(W2(chksum))
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lament('{:04X} -> {:04X}'.format(old_chksum, chksum))
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def copy_save(f, save_from, save_to):
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f.seek(save_from[0])
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data = f.read(save_from[1])
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f.seek(save_to[0])
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f.write(data[:save_to[1]])
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def delete_save(f, save):
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f.seek(save[0])
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f.write(b'\x00'*save[1])
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def run(args):
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for fn in args:
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with open(fn, 'r+b') as f:
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# dumb way to determine byte order
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endian = 'big'
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f.seek(0x10000)
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if f.read(4) != b'\x03\x00\x03\x00':
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endian = 'little'
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if endian == 'little':
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swap_order(f, 'L')
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fix_sum(f, save_1)
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fix_sum(f, save_2)
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fix_sum(f, owl_1, owl=True)
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fix_sum(f, owl_2, owl=True)
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copy_save(f, save_1, save_1_copy)
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copy_save(f, save_2, save_2_copy)
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copy_save(f, owl_1, owl_1_copy)
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copy_save(f, owl_2, owl_2_copy)
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if endian == 'little':
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swap_order(f, 'L')
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return 0
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if __name__ == '__main__':
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try:
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ret = run(sys.argv[1:])
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sys.exit(ret)
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except KeyboardInterrupt:
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sys.exit(1)
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