Line data    Source code

       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             : // Because we wrap lz4.c in an anonymous namespace, all of its #includes
      16             : // go in the anonymous namespace too. This would create conflicting
      17             : // declarations for intrinsic functions that are internally defined
      18             : // at top-level. Including intrin.h here prevents it from being included
      19             : // later within the anonymous namespace.
      20             : #ifdef _MSC_VER
      21             : #include <intrin.h>
      22             : #endif
      23             : 
      24             : using namespace mozilla::Compression;
      25             : 
      26             : namespace {
      27             : 
      28             : #include "lz4.c"
      29             : 
      30             : }/* anonymous namespace */
      31             : 
      32             : /* Our wrappers */
      33             : 
      34             : size_t
      35           0 : LZ4::compress(const char* aSource, size_t aInputSize, char* aDest)
      36             : {
      37           0 :   CheckedInt<int> inputSizeChecked = aInputSize;
      38           0 :   MOZ_ASSERT(inputSizeChecked.isValid());
      39           0 :   return LZ4_compress(aSource, aDest, inputSizeChecked.value());
      40             : }
      41             : 
      42             : size_t
      43           0 : LZ4::compressLimitedOutput(const char* aSource, size_t aInputSize, char* aDest,
      44             :                            size_t aMaxOutputSize)
      45             : {
      46           0 :   CheckedInt<int> inputSizeChecked = aInputSize;
      47           0 :   MOZ_ASSERT(inputSizeChecked.isValid());
      48           0 :   CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
      49           0 :   MOZ_ASSERT(maxOutputSizeChecked.isValid());
      50           0 :   return LZ4_compress_limitedOutput(aSource, aDest, inputSizeChecked.value(),
      51           0 :                                     maxOutputSizeChecked.value());
      52             : }
      53             : 
      54             : bool
      55           1 : LZ4::decompress(const char* aSource, char* aDest, size_t aOutputSize)
      56             : {
      57           1 :   CheckedInt<int> outputSizeChecked = aOutputSize;
      58           1 :   MOZ_ASSERT(outputSizeChecked.isValid());
      59           1 :   int ret = LZ4_decompress_fast(aSource, aDest, outputSizeChecked.value());
      60           1 :   return ret >= 0;
      61             : }
      62             : 
      63             : bool
      64           0 : LZ4::decompress(const char* aSource, size_t aInputSize, char* aDest,
      65             :                 size_t aMaxOutputSize, size_t* aOutputSize)
      66             : {
      67           0 :   CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
      68           0 :   MOZ_ASSERT(maxOutputSizeChecked.isValid());
      69           0 :   CheckedInt<int> inputSizeChecked = aInputSize;
      70           0 :   MOZ_ASSERT(inputSizeChecked.isValid());
      71             : 
      72           0 :   int ret = LZ4_decompress_safe(aSource, aDest, inputSizeChecked.value(),
      73           0 :                                 maxOutputSizeChecked.value());
      74           0 :   if (ret >= 0) {
      75           0 :     *aOutputSize = ret;
      76           0 :     return true;
      77             :   }
      78             : 
      79           0 :   *aOutputSize = 0;
      80           0 :   return false;
      81             : }
      82             :