mfbt/Compression.cpp
author L10n Bumper Bot <release+l10nbumper@mozilla.com>
Thu, 08 Nov 2018 03:00:11 -0800
changeset 501100 1cd4f2d571554c4dc89cf1be1d98683c0d14f797
parent 446342 6f31b7226512260726dbd618b94751024a06909f
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
no bug - Bumping Fennec l10n changesets r=release a=l10n-bump DONTBUILD an -> 336e061995b9 ar -> f6834a7d7374 as -> d2c76e616a66 ast -> fcb8f3455237 az -> c4caf3b07cf2 be -> 697eb1022498 bg -> 7bf1f448f743 bn-BD -> 5f7a87adee06 bn-IN -> 49ce3195c4c2 br -> 41cf35b7c5b5 bs -> 4a14aee27904 ca -> 9373e8ce86d4 cak -> a40d767541ba cs -> 4b99defb0525 cy -> 4c948fed2584 de -> 017a7e7a267a dsb -> aadebeccf5ba el -> 2d28a78dcef5 en-CA -> 55ad9171a9f0 en-GB -> 296422b495e9 en-ZA -> c1b5d2128914 eo -> c68e87667d9f es-AR -> bff0a788c711 es-CL -> 1d3efd2532ea es-ES -> 4d1feb70b0e2 es-MX -> fceda607d0f4 et -> 58a8262a0cc7 eu -> 7cebfd46208b fa -> cbc040d58476 ff -> 46f5aec275ea fi -> 235ab13d261e fr -> 8ee417b64f99

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/Compression.h"
#include "mozilla/CheckedInt.h"

// Without including <string>, MSVC 2015 complains about e.g. the impossibility
// to convert `const void* const` to `void*` when calling memchr from
// corecrt_memory.h.
#include <string>

#include "lz4.h"

using namespace mozilla::Compression;

/* Our wrappers */

size_t
LZ4::compress(const char* aSource, size_t aInputSize, char* aDest)
{
  CheckedInt<int> inputSizeChecked = aInputSize;
  MOZ_ASSERT(inputSizeChecked.isValid());
  return LZ4_compress_default(aSource, aDest, inputSizeChecked.value(),
                              LZ4_compressBound(inputSizeChecked.value()));
}

size_t
LZ4::compressLimitedOutput(const char* aSource, size_t aInputSize, char* aDest,
                           size_t aMaxOutputSize)
{
  CheckedInt<int> inputSizeChecked = aInputSize;
  MOZ_ASSERT(inputSizeChecked.isValid());
  CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
  MOZ_ASSERT(maxOutputSizeChecked.isValid());
  return LZ4_compress_default(aSource, aDest, inputSizeChecked.value(),
                              maxOutputSizeChecked.value());
}

bool
LZ4::decompress(const char* aSource, char* aDest, size_t aOutputSize)
{
  CheckedInt<int> outputSizeChecked = aOutputSize;
  MOZ_ASSERT(outputSizeChecked.isValid());
  int ret = LZ4_decompress_fast(aSource, aDest, outputSizeChecked.value());
  return ret >= 0;
}

bool
LZ4::decompress(const char* aSource, size_t aInputSize, char* aDest,
                size_t aMaxOutputSize, size_t* aOutputSize)
{
  CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
  MOZ_ASSERT(maxOutputSizeChecked.isValid());
  CheckedInt<int> inputSizeChecked = aInputSize;
  MOZ_ASSERT(inputSizeChecked.isValid());

  int ret = LZ4_decompress_safe(aSource, aDest, inputSizeChecked.value(),
                                maxOutputSizeChecked.value());
  if (ret >= 0) {
    *aOutputSize = ret;
    return true;
  }

  *aOutputSize = 0;
  return false;
}

bool
LZ4::decompressPartial(const char* aSource, size_t aInputSize, char* aDest,
                       size_t aMaxOutputSize, size_t* aOutputSize)
{
  CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
  MOZ_ASSERT(maxOutputSizeChecked.isValid());
  CheckedInt<int> inputSizeChecked = aInputSize;
  MOZ_ASSERT(inputSizeChecked.isValid());

  int ret = LZ4_decompress_safe_partial(aSource, aDest,
                                        inputSizeChecked.value(),
                                        maxOutputSizeChecked.value(),
                                        maxOutputSizeChecked.value());
  if (ret >= 0) {
    *aOutputSize = ret;
    return true;
  }

  *aOutputSize = 0;
  return false;
}