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#!/usr/bin/env python3
# Usage: ./dump_decompress.py 75:7d35 00b6 >decompressed.bin
from sys import argv, stdout, stderr
file = open("DMGAKVJ0.1", "rb").read()
bank_addr = argv[1].split(':')
bank = int(bank_addr[0], 16)
addr = int(bank_addr[1], 16)
length = int(argv[2], 16)
offset = bank * 0x4000 + (addr & 0x3fff)
output = []
i = offset
v = 0x00
for _1 in range(length):
byte = file[i]
i += 1
if byte < 0x80:
for _2 in range(byte + 1):
v ^= file[i]
output.append(v)
i += 1
else:
for _2 in range(byte - 0x7e):
v ^= file[i]
output.append(v)
i += 1
stdout.buffer.write(bytes(output)) # decompressed
#stderr.buffer.write(bytes(file[offset:i])) # compressed
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