73 lines
2.6 KiB
C++
73 lines
2.6 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/logging/log.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(std::span<const u8> source, s32 compression_level) {
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compression_level = std::clamp(compression_level, ZSTD_minCLevel(), ZSTD_maxCLevel());
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const std::size_t max_compressed_size = ZSTD_compressBound(source.size());
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if (ZSTD_isError(max_compressed_size)) {
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LOG_ERROR(Common, "Error determining ZSTD maximum compressed size: {} ({})",
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ZSTD_getErrorName(max_compressed_size), max_compressed_size);
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return {};
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}
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std::vector<u8> compressed(max_compressed_size);
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const std::size_t compressed_size = ZSTD_compress(
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compressed.data(), compressed.size(), source.data(), source.size(), compression_level);
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if (ZSTD_isError(compressed_size)) {
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LOG_ERROR(Common, "Error compressing ZSTD data: {} ({})",
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ZSTD_getErrorName(compressed_size), compressed_size);
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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(std::span<const u8> source) {
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return CompressDataZSTD(source, 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_getFrameContentSize(compressed.data(), compressed.size());
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if (decompressed_size == ZSTD_CONTENTSIZE_UNKNOWN) {
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LOG_ERROR(Common, "ZSTD decompressed size could not be determined.");
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return {};
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}
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if (decompressed_size == ZSTD_CONTENTSIZE_ERROR || ZSTD_isError(decompressed_size)) {
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LOG_ERROR(Common, "Error determining ZSTD decompressed size: {} ({})",
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ZSTD_getErrorName(decompressed_size), decompressed_size);
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return {};
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}
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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) {
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LOG_ERROR(Common, "ZSTD decompression expected {} bytes, got {}", decompressed_size,
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uncompressed_result_size);
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return {};
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}
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if (ZSTD_isError(uncompressed_result_size)) {
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LOG_ERROR(Common, "Error decompressing ZSTD data: {} ({})",
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ZSTD_getErrorName(uncompressed_result_size), uncompressed_result_size);
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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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