yuzu-android/src/common/lz4_compression.h
Morph 99ceb03a1c general: Convert source file copyright comments over to SPDX
This formats all copyright comments according to SPDX formatting guidelines.
Additionally, this resolves the remaining GPLv2 only licensed files by relicensing them to GPLv2.0-or-later.
2022-04-23 05:55:32 -04:00

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C++

// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <span>
#include <vector>
#include "common/common_types.h"
namespace Common::Compression {
/**
* Compresses a source memory region with LZ4 and returns the compressed data in a vector.
*
* @param source The uncompressed source memory region.
* @param source_size The size of the uncompressed source memory region.
*
* @return the compressed data.
*/
[[nodiscard]] std::vector<u8> CompressDataLZ4(const u8* source, std::size_t source_size);
/**
* Utilizes the LZ4 subalgorithm LZ4HC with the specified compression level. Higher compression
* levels result in a smaller compressed size, but require more CPU time for compression. The
* compression level has almost no impact on decompression speed. Data compressed with LZ4HC can
* also be decompressed with the default LZ4 decompression.
*
* @param source The uncompressed source memory region.
* @param source_size The size of the uncompressed source memory region.
* @param compression_level The used compression level. Should be between 3 and 12.
*
* @return the compressed data.
*/
[[nodiscard]] std::vector<u8> CompressDataLZ4HC(const u8* source, std::size_t source_size,
s32 compression_level);
/**
* Utilizes the LZ4 subalgorithm LZ4HC with the highest possible compression level.
*
* @param source The uncompressed source memory region.
* @param source_size The size of the uncompressed source memory region
*
* @return the compressed data.
*/
[[nodiscard]] std::vector<u8> CompressDataLZ4HCMax(const u8* source, std::size_t source_size);
/**
* Decompresses a source memory region with LZ4 and returns the uncompressed data in a vector.
*
* @param compressed the compressed source memory region.
* @param uncompressed_size the size in bytes of the uncompressed data.
*
* @return the decompressed data.
*/
[[nodiscard]] std::vector<u8> DecompressDataLZ4(std::span<const u8> compressed,
std::size_t uncompressed_size);
} // namespace Common::Compression