The Tor Browser: gfx/thebes/gfxDWriteCommon.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: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-

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

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

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

     6 #include "gfxDWriteCommon.h"

     8 IDWriteFontFileLoader* gfxDWriteFontFileLoader::mInstance = nullptr;

    10 HRESULT STDMETHODCALLTYPE

    11 gfxDWriteFontFileLoader::CreateStreamFromKey(const void *fontFileReferenceKey,

    12                                              UINT32 fontFileReferenceKeySize,

    13                                              IDWriteFontFileStream **fontFileStream)

    14 {

    15     if (!fontFileReferenceKey || !fontFileStream) {

    16         return E_POINTER;

    17     }

    19     *fontFileStream =

    20         new gfxDWriteFontFileStream(

    21         static_cast<const ffReferenceKey*>(fontFileReferenceKey)->mArray);

    23     if (!*fontFileStream) {

    24         return E_OUTOFMEMORY;

    25     }

    26     (*fontFileStream)->AddRef();

    27     return S_OK;

    28 }

    30 gfxDWriteFontFileStream::gfxDWriteFontFileStream(FallibleTArray<uint8_t> *aData)

    31 {

    32     mData.SwapElements(*aData);

    33 }

    35 gfxDWriteFontFileStream::~gfxDWriteFontFileStream()

    36 {

    37 }

    39 HRESULT STDMETHODCALLTYPE

    40 gfxDWriteFontFileStream::GetFileSize(UINT64 *fileSize)

    41 {

    42     *fileSize = mData.Length();

    43     return S_OK;

    44 }

    46 HRESULT STDMETHODCALLTYPE

    47 gfxDWriteFontFileStream::GetLastWriteTime(UINT64 *lastWriteTime)

    48 {

    49     return E_NOTIMPL;

    50 }

    52 HRESULT STDMETHODCALLTYPE

    53 gfxDWriteFontFileStream::ReadFileFragment(const void **fragmentStart,

    54                                           UINT64 fileOffset,

    55                                           UINT64 fragmentSize,

    56                                           void **fragmentContext)

    57 {

    58     // We are required to do bounds checking.

    59     if (fileOffset + fragmentSize > (UINT64)mData.Length()) {

    60         return E_FAIL;

    61     }

    62     // We should be alive for the duration of this.

    63     *fragmentStart = &mData[fileOffset];

    64     *fragmentContext = nullptr;

    65     return S_OK;

    66 }

    68 void STDMETHODCALLTYPE

    69 gfxDWriteFontFileStream::ReleaseFileFragment(void *fragmentContext)

    70 {

    71 }

The Tor Browser / file revision

gfx/thebes/gfxDWriteCommon.cpp@97036ab72558

gfx/thebes/gfxDWriteCommon.cpp