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cleanup constants

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This commit is contained in:
Connor Olding 2015-03-01 21:00:46 -08:00
parent 2dcab2e22c
commit 6e8d3f9bc2
1 changed files with 17 additions and 11 deletions
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28
chksum.py
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@ -19,39 +19,45 @@ save_2_copy = 0x26800
owl_1_copy = 0x2C800
owl_2_copy = 0x34800
chksum_offset = 0x100A
save_size = 0x2000
owl_size = 0x4000
MAX16 = 0xFFFF
def calc_sum(data):
chksum = 0
for b in data:
chksum += b
chksum &= 0xFFFF
chksum &= MAX16
return chksum
def fix_sum(f, addr, owl=False):
sum_pos = 0x100A
f.seek(addr)
data = f.read(0x2000)
chksum = calc_sum(data[:sum_pos])
data = f.read(save_size)
chksum = calc_sum(data[:chksum_offset])
if owl and data != b'\x00'*0x2000:
if owl and data != b'\x00'*save_size:
chksum += 0x24 # don't know why
chksum &= 0xFFFF
chksum &= MAX16
f.seek(addr + sum_pos)
f.seek(addr + chksum_offset)
old_chksum = R2(f.read(2))
f.seek(addr + sum_pos)
f.seek(addr + chksum_offset)
f.write(W2(chksum))
lament('{:04X} -> {:04X}'.format(old_chksum, chksum))
def copy_save(f, addr, addr2):
sum_pos = 0x100A
f.seek(addr)
data = f.read(0x2000)
# TODO: handle owl size properly
data = f.read(save_size)
f.seek(addr2)
f.write(data)
def delete_save(f, addr):
f.seek(addr)
f.write(b'\x00'*0x2000)
# TODO: handle owl size properly
f.write(b'\x00'*save_size)
def swap_order(f, size='H'):
f.seek(0)