1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "mozilla/Compression.h"
8 #include "mozilla/CheckedInt.h"
9
10 // Without including <string>, MSVC 2015 complains about e.g. the impossibility
11 // to convert `const void* const` to `void*` when calling memchr from
12 // corecrt_memory.h.
13 #include <string>
14
15 #include "lz4.h"
16
17 using namespace mozilla::Compression;
18
19 /* Our wrappers */
20
compress(const char * aSource,size_t aInputSize,char * aDest)21 size_t LZ4::compress(const char* aSource, size_t aInputSize, char* aDest) {
22 CheckedInt<int> inputSizeChecked = aInputSize;
23 MOZ_ASSERT(inputSizeChecked.isValid());
24 return LZ4_compress_default(aSource, aDest, inputSizeChecked.value(),
25 LZ4_compressBound(inputSizeChecked.value()));
26 }
27
compressLimitedOutput(const char * aSource,size_t aInputSize,char * aDest,size_t aMaxOutputSize)28 size_t LZ4::compressLimitedOutput(const char* aSource, size_t aInputSize,
29 char* aDest, size_t aMaxOutputSize) {
30 CheckedInt<int> inputSizeChecked = aInputSize;
31 MOZ_ASSERT(inputSizeChecked.isValid());
32 CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
33 MOZ_ASSERT(maxOutputSizeChecked.isValid());
34 return LZ4_compress_default(aSource, aDest, inputSizeChecked.value(),
35 maxOutputSizeChecked.value());
36 }
37
decompress(const char * aSource,char * aDest,size_t aOutputSize)38 bool LZ4::decompress(const char* aSource, char* aDest, size_t aOutputSize) {
39 CheckedInt<int> outputSizeChecked = aOutputSize;
40 MOZ_ASSERT(outputSizeChecked.isValid());
41 int ret = LZ4_decompress_fast(aSource, aDest, outputSizeChecked.value());
42 return ret >= 0;
43 }
44
decompress(const char * aSource,size_t aInputSize,char * aDest,size_t aMaxOutputSize,size_t * aOutputSize)45 bool LZ4::decompress(const char* aSource, size_t aInputSize, char* aDest,
46 size_t aMaxOutputSize, size_t* aOutputSize) {
47 CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
48 MOZ_ASSERT(maxOutputSizeChecked.isValid());
49 CheckedInt<int> inputSizeChecked = aInputSize;
50 MOZ_ASSERT(inputSizeChecked.isValid());
51
52 int ret = LZ4_decompress_safe(aSource, aDest, inputSizeChecked.value(),
53 maxOutputSizeChecked.value());
54 if (ret >= 0) {
55 *aOutputSize = ret;
56 return true;
57 }
58
59 *aOutputSize = 0;
60 return false;
61 }
62
decompressPartial(const char * aSource,size_t aInputSize,char * aDest,size_t aMaxOutputSize,size_t * aOutputSize)63 bool LZ4::decompressPartial(const char* aSource, size_t aInputSize, char* aDest,
64 size_t aMaxOutputSize, size_t* aOutputSize) {
65 CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
66 MOZ_ASSERT(maxOutputSizeChecked.isValid());
67 CheckedInt<int> inputSizeChecked = aInputSize;
68 MOZ_ASSERT(inputSizeChecked.isValid());
69
70 int ret = LZ4_decompress_safe_partial(
71 aSource, aDest, inputSizeChecked.value(), maxOutputSizeChecked.value(),
72 maxOutputSizeChecked.value());
73 if (ret >= 0) {
74 *aOutputSize = ret;
75 return true;
76 }
77
78 *aOutputSize = 0;
79 return false;
80 }
81