From 798d76f4c7018174e58702fb06a042dc8c84f0be Mon Sep 17 00:00:00 2001
From: unknown <FreddyFunk@users.noreply.github.com>
Date: Thu, 7 Feb 2019 18:28:06 +0100
Subject: data_compression: Move LZ4 compression from
 video_core/gl_shader_disk_cache to common/data_compression

---
 src/common/data_compression.cpp | 46 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 src/common/data_compression.cpp

(limited to 'src/common/data_compression.cpp')

diff --git a/src/common/data_compression.cpp b/src/common/data_compression.cpp
new file mode 100644
index 000000000..624b8ac47
--- /dev/null
+++ 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
-- 
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