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authorunknown <FreddyFunk@users.noreply.github.com>2019-02-08 23:11:00 +0100
committerFreddyFunk <FreddyFunk@users.noreply.github.com>2019-03-29 18:22:08 +0100
commit72477731ed20c56a4d6f18a22f43224fab667cef (patch)
treeb42e73051351850148cbffe65c528c0adfff62af /src/common/zstd_compression.cpp
parentcommon: Link libzstd_static (diff)
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Diffstat (limited to 'src/common/zstd_compression.cpp')
-rw-r--r--src/common/zstd_compression.cpp52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/common/zstd_compression.cpp b/src/common/zstd_compression.cpp
new file mode 100644
index 000000000..f6cf7a791
--- /dev/null
+++ b/src/common/zstd_compression.cpp
@@ -0,0 +1,52 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <algorithm>
+#include <zstd.h>
+
+#include "common/assert.h"
+#include "common/zstd_compression.h"
+
+namespace Common::Compression {
+
+std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size, s32 compression_level) {
+
+ compression_level = std::clamp(compression_level, 1, ZSTD_maxCLevel());
+
+ const std::size_t max_compressed_size = ZSTD_compressBound(source_size);
+ std::vector<u8> compressed(max_compressed_size);
+
+ const std::size_t compressed_size =
+ ZSTD_compress(compressed.data(), compressed.size(), source, source_size, compression_level);
+
+ if (ZSTD_isError(compressed_size)) {
+ // Compression failed
+ return {};
+ }
+
+ compressed.resize(compressed_size);
+
+ return compressed;
+}
+
+std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size) {
+ return CompressDataZSTD(source, source_size, ZSTD_CLEVEL_DEFAULT);
+}
+
+std::vector<u8> DecompressDataZSTD(const std::vector<u8>& compressed,
+ std::size_t uncompressed_size) {
+ std::vector<u8> uncompressed(uncompressed_size);
+ const std::size_t uncompressed_result_size = ZSTD_decompress(
+ uncompressed.data(), uncompressed.size(), compressed.data(), compressed.size());
+
+ if (uncompressed_size != uncompressed_result_size || ZSTD_isError(uncompressed_result_size)) {
+ // Decompression failed
+ return {};
+ }
+ return uncompressed;
+}
+
+} // namespace Common::Compression