C++ nsAutoPtr::Init方法代码示例

NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::BeginStream(const nsACString &table,
                                            const nsACString &serverMAC)
{
  LOG(("nsUrlClassifierDBServiceWorker::BeginStream"));

  if (gShuttingDownThread)
    return NS_ERROR_NOT_INITIALIZED;

  NS_ENSURE_STATE(mUpdateObserver);
  NS_ENSURE_STATE(!mInStream);

  mInStream = true;

  NS_ASSERTION(!mProtocolParser, "Should not have a protocol parser.");

  mProtocolParser = new ProtocolParser(mHashKey);
  if (!mProtocolParser)
    return NS_ERROR_OUT_OF_MEMORY;

  mProtocolParser->Init(mCryptoHash);

  nsresult rv;

  // If we're expecting a MAC, create the nsICryptoHMAC component now.
  if (!mUpdateClientKey.IsEmpty()) {
    LOG(("Expecting MAC in this stream"));
    rv = mProtocolParser->InitHMAC(mUpdateClientKey, serverMAC);
    NS_ENSURE_SUCCESS(rv, rv);
  } else {
    LOG(("No MAC in this stream"));
  }

  if (!table.IsEmpty()) {
    mProtocolParser->SetCurrentTable(table);
  }

  return NS_OK;
}

nsresult
StartBluetoothConnection()
{
  if (sDBusConnection) {
    NS_WARNING("DBusConnection already established, skipping");
    return NS_OK;    
  }
  sBluetoothEventObserverTable = new BluetoothEventObserverTable();
  sBluetoothEventObserverTable->Init(100);

  sDBusConnection = new RawDBusConnection();
  sDBusConnection->EstablishDBusConnection();
	
  // Add a filter for all incoming messages_base
  if (!dbus_connection_add_filter(sDBusConnection->mConnection, EventFilter,
                                  NULL, NULL)) {
    NS_WARNING("Cannot create DBus Event Filter for DBus Thread!");
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

bool
WaveReader::LoadListChunk(uint32_t aChunkSize,
    nsAutoPtr<nsHTMLMediaElement::MetadataTags> &aTags)
{
  // List chunks are always word (two byte) aligned.
  NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                    "LoadListChunk called with unaligned resource");

  static const unsigned int MAX_CHUNK_SIZE = 1 << 16;
  PR_STATIC_ASSERT(MAX_CHUNK_SIZE < UINT_MAX / sizeof(char));

  if (aChunkSize > MAX_CHUNK_SIZE) {
    return false;
  }

  nsAutoArrayPtr<char> chunk(new char[aChunkSize]);
  if (!ReadAll(chunk.get(), aChunkSize)) {
    return false;
  }

  static const uint32_t INFO_LIST_MAGIC = 0x494e464f;
  const char *p = chunk.get();
  if (ReadUint32BE(&p) != INFO_LIST_MAGIC) {
    return false;
  }

  const waveIdToName ID_TO_NAME[] = {
    { 0x49415254, NS_LITERAL_CSTRING("artist") },   // IART
    { 0x49434d54, NS_LITERAL_CSTRING("comments") }, // ICMT
    { 0x49474e52, NS_LITERAL_CSTRING("genre") },    // IGNR
    { 0x494e414d, NS_LITERAL_CSTRING("name") },     // INAM
  };

  const char* const end = chunk.get() + aChunkSize;

  aTags = new nsHTMLMediaElement::MetadataTags;
  aTags->Init();

  while (p + 8 < end) {
    uint32_t id = ReadUint32BE(&p);
    // Uppercase tag id, inspired by GStreamer's Wave parser.
    id &= 0xDFDFDFDF;

    uint32_t length = ReadUint32LE(&p);

    // Subchunk shall not exceed parent chunk.
    if (p + length > end) {
      break;
    }

    nsCString val(p, length);
    if (val[length - 1] == '\0') {
      val.SetLength(length - 1);
    }

    // Chunks in List::INFO are always word (two byte) aligned. So round up if
    // necessary.
    length += length % 2;
    p += length;

    if (!IsUTF8(val)) {
      continue;
    }

    for (size_t i = 0; i < mozilla::ArrayLength(ID_TO_NAME); ++i) {
      if (id == ID_TO_NAME[i].id) {
        aTags->Put(ID_TO_NAME[i].name, val);
        break;
      }
    }
  }

  return true;
}