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This compression scheme was quite popular during the 80's, and we can still find it in use inside file formats such as TIFF or PDF.
28 lines
861 B
C++
28 lines
861 B
C++
/*
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* Copyright (c) 2023, Lucas Chollet <lucas.chollet@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/Optional.h>
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namespace Compress::PackBits {
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// This implements the PackBits compression scheme, aka run-length compression
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// It is fairly simple and described here: https://web.archive.org/web/20080705155158/http://developer.apple.com/technotes/tn/tn1023.html
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// But also in section:
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// - 7.4.5 RunLengthDecode Filter of the PDF specification
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// - Section 9: PackBits Compression of the TIFF specification
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enum class CompatibilityMode {
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Original, // 128 is defined as no-op
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PDF, // 128 is defined as end of stream
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};
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ErrorOr<ByteBuffer> decode_all(ReadonlyBytes bytes, Optional<u64> expected_output_size = {}, CompatibilityMode mode = CompatibilityMode::Original);
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}
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