mirror of
https://github.com/Polprzewodnikowy/SummerCart64.git
synced 2024-11-22 22:19:14 +01:00
71 lines
1.9 KiB
Python
71 lines
1.9 KiB
Python
#!/usr/bin/env python3
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import sys
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from PIL import Image
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def compress(data: bytes, step_size: int=4) -> bytes:
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uncompressed_length = len(data)
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if ((uncompressed_length % step_size) != 0):
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raise ValueError(f'Data length not aligned to {step_size}')
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compressed_data = bytes()
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compressed_data += uncompressed_length.to_bytes(4, byteorder='big')
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count = 0
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last_value = b''
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for offset in range(0, uncompressed_length + step_size, step_size):
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next_value = data[offset:(offset + step_size)]
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if (offset != 0):
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if ((next_value == last_value) and (count < 255)):
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count += 1
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else:
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compressed_data += count.to_bytes(1, byteorder='big')
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compressed_data += last_value
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count = 0
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last_value = next_value
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return compressed_data
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if __name__ == '__main__':
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if (len(sys.argv) < 3):
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print(f'Usage: python {sys.argv[0]} input_path output_path [--compress]')
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sys.exit(1)
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asset_input = sys.argv[1]
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asset_output = sys.argv[2]
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asset_compress = len(sys.argv) > 3 and (sys.argv[3] == '--compress')
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source_asset = None
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final_asset = None
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try:
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source_asset = Image.open(asset_input)
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converted_asset = source_asset.convert('RGB').tobytes()
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if (asset_compress):
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converted_asset = compress(converted_asset, step_size=3)
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final_asset = open(asset_output, 'wb')
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final_asset.write(converted_asset)
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except FileNotFoundError:
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print(f'Couldn\'t open file "{asset_input}"')
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sys.exit(2)
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except Exception as e:
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print(e)
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sys.exit(3)
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finally:
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if (source_asset):
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source_asset.close()
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if (final_asset):
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final_asset.close()
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