The Tor Browser: mfbt/Compression.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "mozilla/Compression.h"

     6 #include "mozilla/CheckedInt.h"

     7 using namespace mozilla::Compression;

     9 namespace {

    11 #include "lz4.c"

    13 }/* anonymous namespace */

    15 /* Our wrappers */

    17 size_t

    18 LZ4::compress(const char* source, size_t inputSize, char* dest)

    19 {

    20     CheckedInt<int> inputSizeChecked = inputSize;

    21     MOZ_ASSERT(inputSizeChecked.isValid());

    22     return LZ4_compress(source, dest, inputSizeChecked.value());

    23 }

    25 size_t

    26 LZ4::compressLimitedOutput(const char* source, size_t inputSize, char* dest, size_t maxOutputSize)

    27 {

    28     CheckedInt<int> inputSizeChecked = inputSize;

    29     MOZ_ASSERT(inputSizeChecked.isValid());

    30     CheckedInt<int> maxOutputSizeChecked = maxOutputSize;

    31     MOZ_ASSERT(maxOutputSizeChecked.isValid());

    32     return LZ4_compress_limitedOutput(source, dest, inputSizeChecked.value(),

    33                                       maxOutputSizeChecked.value());

    34 }

    36 bool

    37 LZ4::decompress(const char* source, char* dest, size_t outputSize)

    38 {

    39     CheckedInt<int> outputSizeChecked = outputSize;

    40     MOZ_ASSERT(outputSizeChecked.isValid());

    41     int ret = LZ4_decompress_fast(source, dest, outputSizeChecked.value());

    42     return ret >= 0;

    43 }

    45 bool

    46 LZ4::decompress(const char* source, size_t inputSize, char* dest, size_t maxOutputSize,

    47                 size_t *outputSize)

    48 {

    49     CheckedInt<int> maxOutputSizeChecked = maxOutputSize;

    50     MOZ_ASSERT(maxOutputSizeChecked.isValid());

    51     CheckedInt<int> inputSizeChecked = inputSize;

    52     MOZ_ASSERT(inputSizeChecked.isValid());

    54     int ret = LZ4_decompress_safe(source, dest, inputSizeChecked.value(),

    55                                   maxOutputSizeChecked.value());

    56     if (ret >= 0) {

    57         *outputSize = ret;

    58         return true;

    59     } else {

    60         *outputSize = 0;

    61         return false;

    62     }

    63 }

The Tor Browser / file revision

mfbt/Compression.cpp@97036ab72558

mfbt/Compression.cpp