Created
May 6, 2024 11:42
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Script to decompress .cx files found in Pokemon Rumble U
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| import zlib | |
| import sys | |
| import struct | |
| """ | |
| .cx file header (0x14 in size): | |
| word[0] 0xe0000000 -> Magic, only the 0x0e is checked | |
| word[1] little endian value, uncompressed size | |
| word[2] 0x624d414c -> "bMAL" Magic | |
| word[3] little endian value, compressed size | |
| word[4] little endian crc32 | |
| """ | |
| with open(sys.argv[1], "rb") as inf: | |
| with open(sys.argv[2], "wb") as outf: | |
| (magic0, decompressed_size, magic1, compressed_size, crc) = struct.unpack("<4sI4sII", inf.read(0x14)) | |
| if magic0[0] != 0xe0 or magic1 != b"bMAL": | |
| raise Exception("Invalid magic values") | |
| compressed = inf.read() | |
| if len(compressed) != compressed_size: | |
| raise Exception("Invalid compressed size") | |
| decompressed = zlib.decompress(compressed) | |
| if len(decompressed) != decompressed_size: | |
| raise Exception("Invalid decompressed size") | |
| if zlib.crc32(decompressed) != crc: | |
| raise Exception("Checksum doesn't match") | |
| outf.write(decompressed) |
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