76 lines
2.7 KiB
C++
76 lines
2.7 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 <lz4hc.h>
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#include "common/assert.h"
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#include "common/lz4_compression.h"
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namespace Common::Compression {
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std::vector<u8> CompressDataLZ4(std::span<const u8> source) {
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ASSERT_MSG(source.size() <= LZ4_MAX_INPUT_SIZE, "Source size exceeds LZ4 maximum input size");
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const auto source_size_int = static_cast<int>(source.size());
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const int max_compressed_size = LZ4_compressBound(source_size_int);
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std::vector<u8> compressed(max_compressed_size);
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const int compressed_size = LZ4_compress_default(reinterpret_cast<const char*>(source.data()),
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reinterpret_cast<char*>(compressed.data()),
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source_size_int, max_compressed_size);
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if (compressed_size <= 0) {
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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> CompressDataLZ4HC(std::span<const u8> source, s32 compression_level) {
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ASSERT_MSG(source.size() <= LZ4_MAX_INPUT_SIZE, "Source size exceeds LZ4 maximum input size");
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compression_level = std::clamp(compression_level, LZ4HC_CLEVEL_MIN, LZ4HC_CLEVEL_MAX);
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const auto source_size_int = static_cast<int>(source.size());
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const int max_compressed_size = LZ4_compressBound(source_size_int);
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std::vector<u8> compressed(max_compressed_size);
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const int compressed_size = LZ4_compress_HC(
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reinterpret_cast<const char*>(source.data()), reinterpret_cast<char*>(compressed.data()),
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source_size_int, max_compressed_size, compression_level);
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if (compressed_size <= 0) {
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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> CompressDataLZ4HCMax(std::span<const u8> source) {
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return CompressDataLZ4HC(source, LZ4HC_CLEVEL_MAX);
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}
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std::vector<u8> DecompressDataLZ4(const std::vector<u8>& compressed,
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std::size_t uncompressed_size) {
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std::vector<u8> uncompressed(uncompressed_size);
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const int size_check = LZ4_decompress_safe(reinterpret_cast<const char*>(compressed.data()),
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reinterpret_cast<char*>(uncompressed.data()),
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static_cast<int>(compressed.size()),
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static_cast<int>(uncompressed.size()));
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if (static_cast<int>(uncompressed_size) != size_check) {
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// Decompression failed
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return {};
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}
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return uncompressed;
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}
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} // namespace Common::Compression
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