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46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
/*
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* Copyright (c) 2023, Tim Schumacher <timschumi@gmx.de>
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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/CircularBuffer.h>
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#include <AK/MaybeOwned.h>
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#include <AK/Stream.h>
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#include <LibCompress/Lzma.h>
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namespace Compress {
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// This is based on the human-language description of the LZMA2 format on the English Wikipedia.
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// https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm#LZMA2_format
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class Lzma2Decompressor : public Stream {
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public:
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/// Creates a decompressor that does not require the leading byte indicating the dictionary size.
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static ErrorOr<NonnullOwnPtr<Lzma2Decompressor>> create_from_raw_stream(MaybeOwned<Stream>, u32 dictionary_size);
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virtual ErrorOr<Bytes> read_some(Bytes) override;
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virtual ErrorOr<size_t> write_some(ReadonlyBytes) override;
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virtual bool is_eof() const override;
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virtual bool is_open() const override;
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virtual void close() override;
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private:
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Lzma2Decompressor(MaybeOwned<Stream>, CircularBuffer dictionary);
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MaybeOwned<Stream> m_stream;
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CircularBuffer m_dictionary;
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// Our dictionary is always initialized, but LZMA2 requires that the first chunk resets the dictionary.
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bool m_dictionary_initialized { false };
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bool m_found_end_of_stream { false };
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Optional<MaybeOwned<Stream>> m_current_chunk_stream;
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bool m_in_uncompressed_chunk { false };
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Optional<NonnullOwnPtr<LzmaDecompressor>> m_last_lzma_stream;
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Optional<LzmaDecompressorOptions> m_last_lzma_options;
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};
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}
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