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common/zstd_compression: Add Zstandard wrapper

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unknown 2019-02-08 23:11:00 +01:00 committed by FreddyFunk
parent ca82589350
commit 72477731ed
3 changed files with 98 additions and 0 deletions

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@ -125,6 +125,8 @@ add_library(common STATIC
uint128.h uint128.h
vector_math.h vector_math.h
web_result.h web_result.h
zstd_compression.cpp
zstd_compression.h
) )
if(ARCHITECTURE_x86_64) if(ARCHITECTURE_x86_64)

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@ -0,0 +1,52 @@
// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <algorithm>
#include <zstd.h>
#include "common/assert.h"
#include "common/zstd_compression.h"
namespace Common::Compression {
std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size, s32 compression_level) {
compression_level = std::clamp(compression_level, 1, ZSTD_maxCLevel());
const std::size_t max_compressed_size = ZSTD_compressBound(source_size);
std::vector<u8> compressed(max_compressed_size);
const std::size_t compressed_size =
ZSTD_compress(compressed.data(), compressed.size(), source, source_size, compression_level);
if (ZSTD_isError(compressed_size)) {
// Compression failed
return {};
}
compressed.resize(compressed_size);
return compressed;
}
std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size) {
return CompressDataZSTD(source, source_size, ZSTD_CLEVEL_DEFAULT);
}
std::vector<u8> DecompressDataZSTD(const std::vector<u8>& compressed,
std::size_t uncompressed_size) {
std::vector<u8> uncompressed(uncompressed_size);
const std::size_t uncompressed_result_size = ZSTD_decompress(
uncompressed.data(), uncompressed.size(), compressed.data(), compressed.size());
if (uncompressed_size != uncompressed_result_size || ZSTD_isError(uncompressed_result_size)) {
// Decompression failed
return {};
}
return uncompressed;
}
} // namespace Common::Compression

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@ -0,0 +1,44 @@
// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include "common/common_types.h"
namespace Common::Compression {
/**
* Compresses a source memory region with Zstandard and returns the compressed data in a vector.
*
* @param source the uncompressed source memory region.
* @param source_size the size in bytes of the uncompressed source memory region.
* @param compression_level the used compression level. Should be between 1 and 22.
*
* @return the compressed data.
*/
std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size, s32 compression_level);
/**
* Compresses a source memory region with Zstandard with the default compression level and returns
* the compressed data in a vector.
*
* @param source the uncompressed source memory region.
* @param source_size the size in bytes of the uncompressed source memory region.
*
* @return the compressed data.
*/
std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size);
/**
* Decompresses a source memory region with Zstandard 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.
*/
std::vector<u8> DecompressDataZSTD(const std::vector<u8>& compressed,
std::size_t uncompressed_size);
} // namespace Common::Compression