mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 05:22:45 +00:00
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
/*
|
|
* Copyright (c) 2023, Tim Schumacher <timschumi@gmx.de>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/CircularBuffer.h>
|
|
#include <AK/MaybeOwned.h>
|
|
#include <AK/Stream.h>
|
|
#include <LibCompress/Lzma.h>
|
|
|
|
namespace Compress {
|
|
|
|
// This is based on the human-language description of the LZMA2 format on the English Wikipedia.
|
|
// https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm#LZMA2_format
|
|
|
|
class Lzma2Decompressor : public Stream {
|
|
public:
|
|
/// Creates a decompressor that does not require the leading byte indicating the dictionary size.
|
|
static ErrorOr<NonnullOwnPtr<Lzma2Decompressor>> create_from_raw_stream(MaybeOwned<Stream>, u32 dictionary_size);
|
|
|
|
virtual ErrorOr<Bytes> read_some(Bytes) override;
|
|
virtual ErrorOr<size_t> write_some(ReadonlyBytes) override;
|
|
virtual bool is_eof() const override;
|
|
virtual bool is_open() const override;
|
|
virtual void close() override;
|
|
|
|
private:
|
|
Lzma2Decompressor(MaybeOwned<Stream>, CircularBuffer dictionary);
|
|
|
|
MaybeOwned<Stream> m_stream;
|
|
CircularBuffer m_dictionary;
|
|
// Our dictionary is always initialized, but LZMA2 requires that the first chunk resets the dictionary.
|
|
bool m_dictionary_initialized { false };
|
|
bool m_found_end_of_stream { false };
|
|
|
|
Optional<MaybeOwned<Stream>> m_current_chunk_stream;
|
|
bool m_in_uncompressed_chunk { false };
|
|
|
|
Optional<NonnullOwnPtr<LzmaDecompressor>> m_last_lzma_stream;
|
|
Optional<LzmaDecompressorOptions> m_last_lzma_options;
|
|
};
|
|
|
|
}
|