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authorGravatar unknown2019-02-08 06:45:50 +0100
committerGravatar FreddyFunk2019-03-29 18:12:42 +0100
commitc791192d649cf01483dbea9907c6d13909b8e5a3 (patch)
tree1b62eaf1f16edfe93ce84c61bed9357d55e1e4e6 /src/common/data_compression.cpp
parentcore: Do not link LZ4 to core. Use common/data_compression for nso segment de... (diff)
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-rw-r--r--src/common/data_compression.cpp56
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diff --git a/src/common/data_compression.cpp b/src/common/data_compression.cpp
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1// Copyright 2019 yuzu Emulator Project
2// Licensed under GPLv2 or any later version
3// Refer to the license.txt file included.
4
5#pragma once
6
7#include <lz4hc.h>
8
9#include "data_compression.h"
10
11namespace Compression {
12
13std::vector<u8> CompressDataLZ4(const u8* source, std::size_t source_size,
14 bool use_LZ4_high_compression) {
15 if (source_size > LZ4_MAX_INPUT_SIZE) {
16 // Source size exceeds LZ4 maximum input size
17 return {};
18 }
19 const auto source_size_int = static_cast<int>(source_size);
20 const int max_compressed_size = LZ4_compressBound(source_size_int);
21 std::vector<u8> compressed(max_compressed_size);
22 int compressed_size = 0;
23
24 if (use_LZ4_high_compression) {
25 compressed_size = LZ4_compress_HC(reinterpret_cast<const char*>(source),
26 reinterpret_cast<char*>(compressed.data()),
27 source_size_int, max_compressed_size, LZ4HC_CLEVEL_MAX);
28 } else {
29 compressed_size = LZ4_compress_default(reinterpret_cast<const char*>(source),
30 reinterpret_cast<char*>(compressed.data()),
31 source_size_int, max_compressed_size);
32 }
33
34 if (compressed_size <= 0) {
35 // Compression failed
36 return {};
37 }
38 compressed.resize(compressed_size);
39 return compressed;
40}
41
42std::vector<u8> DecompressDataLZ4(const std::vector<u8>& compressed,
43 std::size_t uncompressed_size) {
44 std::vector<u8> uncompressed(uncompressed_size);
45 const int size_check = LZ4_decompress_safe(reinterpret_cast<const char*>(compressed.data()),
46 reinterpret_cast<char*>(uncompressed.data()),
47 static_cast<int>(compressed.size()),
48 static_cast<int>(uncompressed.size()));
49 if (static_cast<int>(uncompressed_size) != size_check) {
50 // Decompression failed
51 return {};
52 }
53 return uncompressed;
54}
55
56} // namespace Compression