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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <zstd.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(std::span<const u8> compressed) {
return TryDecompressDataZSTD(compressed, std::vector<u8>{}.max_size())
.value_or(std::vector<u8>{});
}
std::optional<std::vector<u8>> TryDecompressDataZSTD(std::span<const u8> compressed,
std::size_t max_size) {
// The size comes from the frame header, so check it before allocating
const unsigned long long decompressed_size =
ZSTD_getFrameContentSize(compressed.data(), compressed.size());
if (decompressed_size == ZSTD_CONTENTSIZE_ERROR ||
decompressed_size == ZSTD_CONTENTSIZE_UNKNOWN || decompressed_size > max_size) {
return std::nullopt;
}
std::vector<u8> decompressed(static_cast<std::size_t>(decompressed_size));
const std::size_t uncompressed_result_size = ZSTD_decompress(
decompressed.data(), decompressed.size(), compressed.data(), compressed.size());
if (ZSTD_isError(uncompressed_result_size) || uncompressed_result_size != decompressed_size) {
return std::nullopt;
}
return decompressed;
}
std::size_t DecompressDataZSTD(std::span<const u8> compressed, std::span<u8> output) {
const std::size_t result =
ZSTD_decompress(output.data(), output.size(), compressed.data(), compressed.size());
return ZSTD_isError(result) ? 0 : result;
}
} // namespace Common::Compression
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