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-rw-r--r--src/common/data_compression.cpp46
1 files changed, 46 insertions, 0 deletions
diff --git a/src/common/data_compression.cpp b/src/common/data_compression.cpp
new file mode 100644
index 000000000..624b8ac47
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+++ b/src/common/data_compression.cpp
@@ -0,0 +1,46 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <lz4.h>
+
+#include "data_compression.h"
+
+namespace Compression {
+
+
+std::vector<u8> CompressDataLZ4(const u8* source, std::size_t source_size) {
+ if (source_size > LZ4_MAX_INPUT_SIZE) {
+ // Source size exceeds LZ4 maximum input size
+ return {};
+ }
+ 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),
+ 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> 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 Compression