The Tor Browser: content/media/EncodedBufferCache.cpp@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     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 "EncodedBufferCache.h"

     8 #include "nsAnonymousTemporaryFile.h"

     9 #include "nsDOMFile.h"

    10 #include "prio.h"

    12 namespace mozilla {

    14 void

    15 EncodedBufferCache::AppendBuffer(nsTArray<uint8_t> & aBuf)

    16 {

    17   MutexAutoLock lock(mMutex);

    18   mDataSize += aBuf.Length();

    20   mEncodedBuffers.AppendElement()->SwapElements(aBuf);

    22   if (!mTempFileEnabled && mDataSize > mMaxMemoryStorage) {

    23     nsresult rv = NS_OpenAnonymousTemporaryFile(&mFD);

    24     if (!NS_FAILED(rv)) {

    25       mTempFileEnabled = true;

    26     }

    27   }

    29   if (mTempFileEnabled) {

    30     // has created temporary file, write buffer in it

    31     for (uint32_t i = 0; i < mEncodedBuffers.Length(); i++) {

    32       int64_t amount = PR_Write(mFD, mEncodedBuffers.ElementAt(i).Elements(), mEncodedBuffers.ElementAt(i).Length());

    33       if (amount <  mEncodedBuffers.ElementAt(i).Length()) {

    34         NS_WARNING("Failed to write media cache block!");

    35       }

    36     }

    37     mEncodedBuffers.Clear();

    38   }

    40 }

    42 already_AddRefed<nsIDOMBlob>

    43 EncodedBufferCache::ExtractBlob(const nsAString &aContentType)

    44 {

    45   MutexAutoLock lock(mMutex);

    46   nsCOMPtr<nsIDOMBlob> blob;

    47   if (mTempFileEnabled) {

    48     // generate new temporary file to write

    49     blob = new nsDOMTemporaryFileBlob(mFD, 0, mDataSize, aContentType);

    50     // fallback to memory blob

    51     mTempFileEnabled = false;

    52     mDataSize = 0;

    53     mFD = nullptr;

    54   } else {

    55     void* blobData = moz_malloc(mDataSize);

    56     NS_ASSERTION(blobData, "out of memory!!");

    58     if (blobData) {

    59       for (uint32_t i = 0, offset = 0; i < mEncodedBuffers.Length(); i++) {

    60         memcpy((uint8_t*)blobData + offset, mEncodedBuffers.ElementAt(i).Elements(),

    61                mEncodedBuffers.ElementAt(i).Length());

    62         offset += mEncodedBuffers.ElementAt(i).Length();

    63       }

    64       blob = new nsDOMMemoryFile(blobData, mDataSize,

    65                                  aContentType);

    66       mEncodedBuffers.Clear();

    67     } else

    68       return nullptr;

    69   }

    70   mDataSize = 0;

    71   return blob.forget();

    72 }

    74 } //end namespace

The Tor Browser / file revision