31 lines
590 B
GDScript
31 lines
590 B
GDScript
@tool
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extends RefCounted
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class LSBLZWBitPacker:
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var bit_index: int = 0
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var stream: int = 0
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var chunks: PackedByteArray = PackedByteArray([])
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func put_byte():
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chunks.append(stream & 0xff)
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bit_index -= 8
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stream >>= 8
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func write_bits(value: int, bits_count: int) -> void:
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value &= (1 << bits_count) - 1
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value <<= bit_index
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stream |= value
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bit_index += bits_count
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while bit_index >= 8:
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put_byte()
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func pack() -> PackedByteArray:
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if bit_index != 0:
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put_byte()
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return chunks
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func reset() -> void:
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bit_index = 0
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stream = 0
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chunks = PackedByteArray([])
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