content/media/mediasource/SourceBufferResource.cpp@97036ab72558 (annotated)
content/media/mediasource/SourceBufferResource.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
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.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "SourceBufferResource.h" |
| michael@0 | 8 | |
| michael@0 | 9 | #include <string.h> |
| michael@0 | 10 | #include <algorithm> |
| michael@0 | 11 | |
| michael@0 | 12 | #include "nsISeekableStream.h" |
| michael@0 | 13 | #include "nsISupportsImpl.h" |
| michael@0 | 14 | #include "prenv.h" |
| michael@0 | 15 | #include "prlog.h" |
| michael@0 | 16 | |
| michael@0 | 17 | #ifdef PR_LOGGING |
| michael@0 | 18 | extern PRLogModuleInfo* gMediaSourceLog; |
| michael@0 | 19 | #define MSE_DEBUG(...) PR_LOG(gMediaSourceLog, PR_LOG_DEBUG, (__VA_ARGS__)) |
| michael@0 | 20 | #else |
| michael@0 | 21 | #define MSE_DEBUG(...) |
| michael@0 | 22 | #endif |
| michael@0 | 23 | |
| michael@0 | 24 | namespace mozilla { |
| michael@0 | 25 | |
| michael@0 | 26 | namespace dom { |
| michael@0 | 27 | |
| michael@0 | 28 | class SourceBuffer; |
| michael@0 | 29 | |
| michael@0 | 30 | } // namespace dom |
| michael@0 | 31 | |
| michael@0 | 32 | nsresult |
| michael@0 | 33 | SourceBufferResource::Close() |
| michael@0 | 34 | { |
| michael@0 | 35 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 36 | MSE_DEBUG("%p SBR::Close", this); |
| michael@0 | 37 | //MOZ_ASSERT(!mClosed); |
| michael@0 | 38 | mClosed = true; |
| michael@0 | 39 | mon.NotifyAll(); |
| michael@0 | 40 | return NS_OK; |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | nsresult |
| michael@0 | 44 | SourceBufferResource::Read(char* aBuffer, uint32_t aCount, uint32_t* aBytes) |
| michael@0 | 45 | { |
| michael@0 | 46 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 47 | bool blockingRead = !!aBytes; |
| michael@0 | 48 | |
| michael@0 | 49 | while (blockingRead && |
| michael@0 | 50 | !mEnded && |
| michael@0 | 51 | mOffset + aCount > static_cast<uint64_t>(GetLength())) { |
| michael@0 | 52 | MSE_DEBUG("%p SBR::Read waiting for data", this); |
| michael@0 | 53 | mon.Wait(); |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | uint32_t available = GetLength() - mOffset; |
| michael@0 | 57 | uint32_t count = std::min(aCount, available); |
| michael@0 | 58 | if (!PR_GetEnv("MOZ_QUIET")) { |
| michael@0 | 59 | MSE_DEBUG("%p SBR::Read aCount=%u length=%u offset=%u " |
| michael@0 | 60 | "available=%u count=%u, blocking=%d bufComplete=%d", |
| michael@0 | 61 | this, aCount, GetLength(), mOffset, available, count, |
| michael@0 | 62 | blockingRead, mEnded); |
| michael@0 | 63 | } |
| michael@0 | 64 | if (available == 0) { |
| michael@0 | 65 | MSE_DEBUG("%p SBR::Read EOF", this); |
| michael@0 | 66 | *aBytes = 0; |
| michael@0 | 67 | return NS_OK; |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | mInputBuffer.CopyData(mOffset, count, aBuffer); |
| michael@0 | 71 | *aBytes = count; |
| michael@0 | 72 | mOffset += count; |
| michael@0 | 73 | return NS_OK; |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | nsresult |
| michael@0 | 77 | SourceBufferResource::ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes) |
| michael@0 | 78 | { |
| michael@0 | 79 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 80 | nsresult rv = Seek(nsISeekableStream::NS_SEEK_SET, aOffset); |
| michael@0 | 81 | if (NS_FAILED(rv)) { |
| michael@0 | 82 | return rv; |
| michael@0 | 83 | } |
| michael@0 | 84 | return Read(aBuffer, aCount, aBytes); |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | nsresult |
| michael@0 | 88 | SourceBufferResource::Seek(int32_t aWhence, int64_t aOffset) |
| michael@0 | 89 | { |
| michael@0 | 90 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 91 | if (mClosed) { |
| michael@0 | 92 | return NS_ERROR_FAILURE; |
| michael@0 | 93 | } |
| michael@0 | 94 | |
| michael@0 | 95 | int64_t newOffset = mOffset; |
| michael@0 | 96 | switch (aWhence) { |
| michael@0 | 97 | case nsISeekableStream::NS_SEEK_END: |
| michael@0 | 98 | newOffset = GetLength() - aOffset; |
| michael@0 | 99 | break; |
| michael@0 | 100 | case nsISeekableStream::NS_SEEK_CUR: |
| michael@0 | 101 | newOffset += aOffset; |
| michael@0 | 102 | break; |
| michael@0 | 103 | case nsISeekableStream::NS_SEEK_SET: |
| michael@0 | 104 | newOffset = aOffset; |
| michael@0 | 105 | break; |
| michael@0 | 106 | } |
| michael@0 | 107 | |
| michael@0 | 108 | if (newOffset < 0 || uint64_t(newOffset) < mInputBuffer.GetOffset() || newOffset > GetLength()) { |
| michael@0 | 109 | return NS_ERROR_FAILURE; |
| michael@0 | 110 | } |
| michael@0 | 111 | |
| michael@0 | 112 | mOffset = newOffset; |
| michael@0 | 113 | mon.NotifyAll(); |
| michael@0 | 114 | |
| michael@0 | 115 | return NS_OK; |
| michael@0 | 116 | } |
| michael@0 | 117 | |
| michael@0 | 118 | nsresult |
| michael@0 | 119 | SourceBufferResource::ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount) |
| michael@0 | 120 | { |
| michael@0 | 121 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 122 | nsresult rv = Seek(nsISeekableStream::NS_SEEK_SET, aOffset); |
| michael@0 | 123 | if (NS_FAILED(rv)) { |
| michael@0 | 124 | return rv; |
| michael@0 | 125 | } |
| michael@0 | 126 | return Read(aBuffer, aCount, nullptr); |
| michael@0 | 127 | } |
| michael@0 | 128 | |
| michael@0 | 129 | bool |
| michael@0 | 130 | SourceBufferResource::EvictData(uint32_t aThreshold) |
| michael@0 | 131 | { |
| michael@0 | 132 | return mInputBuffer.Evict(mOffset, aThreshold); |
| michael@0 | 133 | } |
| michael@0 | 134 | |
| michael@0 | 135 | void |
| michael@0 | 136 | SourceBufferResource::EvictBefore(uint64_t aOffset) |
| michael@0 | 137 | { |
| michael@0 | 138 | // If aOffset is past the current playback offset we don't evict. |
| michael@0 | 139 | if (aOffset < mOffset) { |
| michael@0 | 140 | mInputBuffer.Evict(aOffset, 0); |
| michael@0 | 141 | } |
| michael@0 | 142 | } |
| michael@0 | 143 | |
| michael@0 | 144 | void |
| michael@0 | 145 | SourceBufferResource::AppendData(const uint8_t* aData, uint32_t aLength) |
| michael@0 | 146 | { |
| michael@0 | 147 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 148 | mInputBuffer.PushBack(new ResourceItem(aData, aLength)); |
| michael@0 | 149 | mon.NotifyAll(); |
| michael@0 | 150 | } |
| michael@0 | 151 | |
| michael@0 | 152 | void |
| michael@0 | 153 | SourceBufferResource::Ended() |
| michael@0 | 154 | { |
| michael@0 | 155 | ReentrantMonitorAutoEnter mon(mMonitor); |
| michael@0 | 156 | mEnded = true; |
| michael@0 | 157 | mon.NotifyAll(); |
| michael@0 | 158 | } |
| michael@0 | 159 | |
| michael@0 | 160 | SourceBufferResource::~SourceBufferResource() |
| michael@0 | 161 | { |
| michael@0 | 162 | MOZ_COUNT_DTOR(SourceBufferResource); |
| michael@0 | 163 | MSE_DEBUG("%p SBR::~SBR", this); |
| michael@0 | 164 | } |
| michael@0 | 165 | |
| michael@0 | 166 | SourceBufferResource::SourceBufferResource(nsIPrincipal* aPrincipal, |
| michael@0 | 167 | const nsACString& aType) |
| michael@0 | 168 | : mPrincipal(aPrincipal) |
| michael@0 | 169 | , mType(aType) |
| michael@0 | 170 | , mMonitor("mozilla::SourceBufferResource::mMonitor") |
| michael@0 | 171 | , mOffset(0) |
| michael@0 | 172 | , mClosed(false) |
| michael@0 | 173 | , mEnded(false) |
| michael@0 | 174 | { |
| michael@0 | 175 | MOZ_COUNT_CTOR(SourceBufferResource); |
| michael@0 | 176 | MSE_DEBUG("%p SBR::SBR()", this); |
| michael@0 | 177 | } |
| michael@0 | 178 | |
| michael@0 | 179 | } // namespace mozilla |
