mirror of
https://github.com/yuzu-mirror/yuzu.git
synced 2024-11-05 23:49:58 +00:00
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
// 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(const u8* source, std::size_t source_size) {
|
|
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 auto max_compressed_size = static_cast<std::size_t>(LZ4_compressBound(source_size_int));
|
|
std::vector<u8> compressed(max_compressed_size);
|
|
|
|
const int compressed_size = LZ4_compress_default(
|
|
reinterpret_cast<const char*>(source), reinterpret_cast<char*>(compressed.data()),
|
|
source_size_int, static_cast<int>(max_compressed_size));
|
|
|
|
if (compressed_size <= 0) {
|
|
// Compression failed
|
|
return {};
|
|
}
|
|
|
|
compressed.resize(static_cast<std::size_t>(compressed_size));
|
|
|
|
return compressed;
|
|
}
|
|
|
|
std::vector<u8> CompressDataLZ4HC(const u8* source, std::size_t source_size,
|
|
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 auto max_compressed_size = static_cast<std::size_t>(LZ4_compressBound(source_size_int));
|
|
std::vector<u8> compressed(max_compressed_size);
|
|
|
|
const int compressed_size = LZ4_compress_HC(
|
|
reinterpret_cast<const char*>(source), reinterpret_cast<char*>(compressed.data()),
|
|
source_size_int, static_cast<int>(max_compressed_size), compression_level);
|
|
|
|
if (compressed_size <= 0) {
|
|
// Compression failed
|
|
return {};
|
|
}
|
|
|
|
compressed.resize(static_cast<std::size_t>(compressed_size));
|
|
|
|
return compressed;
|
|
}
|
|
|
|
std::vector<u8> CompressDataLZ4HCMax(const u8* source, std::size_t source_size) {
|
|
return CompressDataLZ4HC(source, source_size, LZ4HC_CLEVEL_MAX);
|
|
}
|
|
|
|
std::vector<u8> DecompressDataLZ4(std::span<const 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
|