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Libraries: Move to Userland/Libraries/
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1857 changed files with 266 additions and 274 deletions
117
Userland/Libraries/LibCompress/Deflate.h
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117
Userland/Libraries/LibCompress/Deflate.h
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/*
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* Copyright (c) 2020, the SerenityOS developers
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/BitStream.h>
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#include <AK/ByteBuffer.h>
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#include <AK/CircularDuplexStream.h>
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#include <AK/Endian.h>
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#include <AK/Vector.h>
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namespace Compress {
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class CanonicalCode {
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public:
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CanonicalCode() = default;
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u32 read_symbol(InputBitStream&) const;
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static const CanonicalCode& fixed_literal_codes();
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static const CanonicalCode& fixed_distance_codes();
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static Optional<CanonicalCode> from_bytes(ReadonlyBytes);
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private:
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Vector<u32> m_symbol_codes;
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Vector<u32> m_symbol_values;
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};
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class DeflateDecompressor final : public InputStream {
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private:
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class CompressedBlock {
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public:
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CompressedBlock(DeflateDecompressor&, CanonicalCode literal_codes, Optional<CanonicalCode> distance_codes);
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bool try_read_more();
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private:
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bool m_eof { false };
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DeflateDecompressor& m_decompressor;
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CanonicalCode m_literal_codes;
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Optional<CanonicalCode> m_distance_codes;
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};
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class UncompressedBlock {
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public:
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UncompressedBlock(DeflateDecompressor&, size_t);
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bool try_read_more();
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private:
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DeflateDecompressor& m_decompressor;
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size_t m_bytes_remaining;
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};
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enum class State {
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Idle,
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ReadingCompressedBlock,
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ReadingUncompressedBlock
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};
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public:
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friend CompressedBlock;
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friend UncompressedBlock;
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DeflateDecompressor(InputStream&);
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~DeflateDecompressor();
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size_t read(Bytes) override;
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bool read_or_error(Bytes) override;
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bool discard_or_error(size_t) override;
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bool unreliable_eof() const override;
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static Optional<ByteBuffer> decompress_all(ReadonlyBytes);
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private:
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u32 decode_length(u32);
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u32 decode_distance(u32);
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void decode_codes(CanonicalCode& literal_code, Optional<CanonicalCode>& distance_code);
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bool m_read_final_bock { false };
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State m_state { State::Idle };
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union {
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CompressedBlock m_compressed_block;
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UncompressedBlock m_uncompressed_block;
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};
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InputBitStream m_input_stream;
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CircularDuplexStream<32 * 1024> m_output_stream;
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};
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}
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