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import struct | |
import fastlz | |
file = open("/home/dexter/sc/snoita/save00/world/world_0_0.png_petri", "rb") | |
file_content = file.read() | |
# This uses little-endian, the rest of the file uses big-endian | |
compressed_size, uncompressed_size = struct.unpack("<ii", file_content[0:8]) | |
# Noita includes the compressed size at the start, not counting it and the | |
# uncompressed sizes. | |
assert compressed_size == len(file_content) - 8 | |
# pyfastlz expects the decompressed size at the start of the buffer, which | |
# we can match by taking a slice that discards the first 4 bytes | |
uncompressed_data = fastlz.decompress(file_content[4:]) | |
assert uncompressed_size == len(uncompressed_data) | |
version, width, height = struct.unpack(">iii", uncompressed_data[0:12]) | |
print(f"{version=}") | |
print(f"{width=}") | |
print(f"{height=}") | |
# After this comes: | |
# 512*512 bytes that are the materials in the world (these are indices into the materials list) | |
# Material list length followed by that many | |
# - mat name length | |
# - mat name bytes |
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