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Verify type 0 sprite file in TWG
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# -*- coding: utf-8 -*- | |
import argparse | |
import struct | |
import os | |
parser = argparse.ArgumentParser(description='Check sprite file.') | |
parser.add_argument('-f', required=True, help='sprite file', dest='spr') | |
args = parser.parse_args() | |
with open(args.spr, 'rb') as f: | |
f.seek(0, os.SEEK_END) | |
file_len = f.tell() | |
f.seek(0, os.SEEK_SET) | |
bytes = f.read(0x40) | |
assert b'New Fast&Compress Sprite Ver3.0 for 13h mode!!!. SOFTMAX(C)1994.' == bytes | |
f.seek(2, os.SEEK_CUR) | |
# total number of sprites | |
bytes = f.read(2) | |
bytes = struct.unpack('<H', bytes) # little-endian, unsigned short | |
num = bytes[0] | |
# zero padding | |
f.seek(60, os.SEEK_CUR) | |
for n in range(num): | |
# total length of compressed pixel data | |
bytes = f.read(4) | |
bytes = struct.unpack('<I', bytes) # little-endian, unsigned int | |
len = bytes[0] | |
# width of a sprite | |
bytes = f.read(2) | |
bytes = struct.unpack('<H', bytes) | |
assert 320 >= bytes[0] | |
# height of a sprite | |
bytes = f.read(2) | |
bytes = struct.unpack('<H', bytes) | |
assert 200 >= bytes[0] | |
# unknown | |
f.seek(2, os.SEEK_CUR) | |
f.seek(2, os.SEEK_CUR) | |
buf = f.read(2) | |
buf = struct.unpack('<H', buf) | |
blocks = buf[0] | |
l = 0 | |
for b in range(blocks): | |
buf = f.read(2) | |
buf = struct.unpack('<H', buf) | |
blanks = buf[0] | |
buf = f.read(1) | |
buf = struct.unpack('<B', buf) | |
i = buf[0] | |
buf = f.read(1) | |
buf = struct.unpack('<B', buf) | |
j = buf[0] | |
f.read(4 * i + j) | |
l = l + 2 + 1 + 1 + 4 * i + j | |
assert (l + 2) == len | |
assert f.tell() == file_len |
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