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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <lz4hc.h>
#include "common/assert.h"
#include "common/lz4_compression.h"
namespace Common::Compression {
std::vector<u8> CompressDataLZ4(std::span<const u8> source) {
ASSERT_MSG(source.size() <= LZ4_MAX_INPUT_SIZE, "Source size exceeds LZ4 maximum input size");
const auto source_size_int = static_cast<int>(source.size());
const int max_compressed_size = LZ4_compressBound(source_size_int);
std::vector<u8> compressed(max_compressed_size);
const int compressed_size = LZ4_compress_default(reinterpret_cast<const char*>(source.data()),
reinterpret_cast<char*>(compressed.data()),
source_size_int, max_compressed_size);
if (compressed_size <= 0) {
// Compression failed
return {};
}
compressed.resize(compressed_size);
return compressed;
}
std::vector<u8> CompressDataLZ4HC(std::span<const u8> source, s32 compression_level) {
ASSERT_MSG(source.size() <= LZ4_MAX_INPUT_SIZE, "Source size exceeds LZ4 maximum input size");
compression_level = std::clamp(compression_level, LZ4HC_CLEVEL_MIN, LZ4HC_CLEVEL_MAX);
const auto source_size_int = static_cast<int>(source.size());
const int max_compressed_size = LZ4_compressBound(source_size_int);
std::vector<u8> compressed(max_compressed_size);
const int compressed_size = LZ4_compress_HC(
reinterpret_cast<const char*>(source.data()), reinterpret_cast<char*>(compressed.data()),
source_size_int, max_compressed_size, compression_level);
if (compressed_size <= 0) {
// Compression failed
return {};
}
compressed.resize(compressed_size);
return compressed;
}
std::vector<u8> CompressDataLZ4HCMax(std::span<const u8> source) {
return CompressDataLZ4HC(source, LZ4HC_CLEVEL_MAX);
}
std::vector<u8> DecompressDataLZ4(const std::vector<u8>& compressed,
std::size_t uncompressed_size) {
std::vector<u8> uncompressed(uncompressed_size);
const int size_check = LZ4_decompress_safe(reinterpret_cast<const char*>(compressed.data()),
reinterpret_cast<char*>(uncompressed.data()),
static_cast<int>(compressed.size()),
static_cast<int>(uncompressed.size()));
if (static_cast<int>(uncompressed_size) != size_check) {
// Decompression failed
return {};
}
return uncompressed;
}
} // namespace Common::Compression
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