The Tor Browser: content/media/webaudio/PeriodicWave.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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     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/. */

     7 #include "PeriodicWave.h"

     8 #include "AudioContext.h"

     9 #include "mozilla/dom/PeriodicWaveBinding.h"

    11 namespace mozilla {

    12 namespace dom {

    14 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(PeriodicWave, mContext)

    16 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(PeriodicWave, AddRef)

    17 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(PeriodicWave, Release)

    19 PeriodicWave::PeriodicWave(AudioContext* aContext,

    20                            const float* aRealData,

    21                            const float* aImagData,

    22                            const uint32_t aLength,

    23                            ErrorResult& aRv)

    24   : mContext(aContext)

    25 {

    26   MOZ_ASSERT(aContext);

    27   SetIsDOMBinding();

    29   // Caller should have checked this and thrown.

    30   MOZ_ASSERT(aLength > 0);

    31   MOZ_ASSERT(aLength <= 4096);

    32   mLength = aLength;

    34   // Copy coefficient data. The two arrays share an allocation.

    35   mCoefficients = new ThreadSharedFloatArrayBufferList(2);

    36   float* buffer = static_cast<float*>(malloc(aLength*sizeof(float)*2));

    37   if (buffer == nullptr) {

    38     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);

    39     return;

    40   }

    41   PodCopy(buffer, aRealData, aLength);

    42   mCoefficients->SetData(0, buffer, buffer);

    43   PodCopy(buffer+aLength, aImagData, aLength);

    44   mCoefficients->SetData(1, nullptr, buffer+aLength);

    45 }

    47 size_t

    48 PeriodicWave::SizeOfExcludingThisIfNotShared(MallocSizeOf aMallocSizeOf) const

    49 {

    50   // Not owned:

    51   // - mContext

    52   size_t amount = 0;

    53   if (!mCoefficients->IsShared()) {

    54     amount += mCoefficients->SizeOfIncludingThis(aMallocSizeOf);

    55   }

    57   return amount;

    58 }

    60 JSObject*

    61 PeriodicWave::WrapObject(JSContext* aCx)

    62 {

    63   return PeriodicWaveBinding::Wrap(aCx, this);

    64 }

    66 } // namespace dom

    67 } // namespace mozilla

The Tor Browser / file revision

content/media/webaudio/PeriodicWave.cpp@97036ab72558

content/media/webaudio/PeriodicWave.cpp