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https://github.com/yuzu-mirror/yuzu
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50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
// Copyright 2019 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <zstd.h>
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#include "common/zstd_compression.h"
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namespace Common::Compression {
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std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size, s32 compression_level) {
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compression_level = std::clamp(compression_level, 1, ZSTD_maxCLevel());
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const std::size_t max_compressed_size = ZSTD_compressBound(source_size);
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std::vector<u8> compressed(max_compressed_size);
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const std::size_t compressed_size =
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ZSTD_compress(compressed.data(), compressed.size(), source, source_size, compression_level);
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if (ZSTD_isError(compressed_size)) {
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// Compression failed
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return {};
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}
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compressed.resize(compressed_size);
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return compressed;
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}
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std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size) {
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return CompressDataZSTD(source, source_size, ZSTD_CLEVEL_DEFAULT);
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}
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std::vector<u8> DecompressDataZSTD(std::span<const u8> compressed) {
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const std::size_t decompressed_size =
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ZSTD_getDecompressedSize(compressed.data(), compressed.size());
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std::vector<u8> decompressed(decompressed_size);
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const std::size_t uncompressed_result_size = ZSTD_decompress(
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decompressed.data(), decompressed.size(), compressed.data(), compressed.size());
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if (decompressed_size != uncompressed_result_size || ZSTD_isError(uncompressed_result_size)) {
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// Decompression failed
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return {};
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}
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return decompressed;
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}
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} // namespace Common::Compression
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