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Diffstat (limited to '')
-rw-r--r-- | src/common/zstd_compression.cpp | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/common/zstd_compression.cpp b/src/common/zstd_compression.cpp new file mode 100644 index 000000000..60a35c67c --- /dev/null +++ b/src/common/zstd_compression.cpp @@ -0,0 +1,53 @@ +// 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) { + const std::size_t decompressed_size = + ZSTD_getDecompressedSize(compressed.data(), compressed.size()); + std::vector<u8> decompressed(decompressed_size); + + const std::size_t uncompressed_result_size = ZSTD_decompress( + decompressed.data(), decompressed.size(), compressed.data(), compressed.size()); + + if (decompressed_size != uncompressed_result_size || ZSTD_isError(uncompressed_result_size)) { + // Decompression failed + return {}; + } + return decompressed; +} + +} // namespace Common::Compression |