nsresult
RegisterBluetoothEventHandler(const nsCString& aNodeName,
BluetoothEventObserver* aHandler)
{
MOZ_ASSERT(NS_IsMainThread());
BluetoothEventObserverList *ol;
NS_ENSURE_TRUE(sBluetoothEventObserverTable, NS_ERROR_FAILURE);
if (!sBluetoothEventObserverTable->Get(aNodeName, &ol)) {
sBluetoothEventObserverTable->Put(aNodeName,
new BluetoothEventObserverList());
}
sBluetoothEventObserverTable->Get(aNodeName, &ol);
ol->AddObserver(aHandler);
return NS_OK;
}
bool
WaveReader::LoadListChunk(uint32_t aChunkSize,
nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags)
{
// List chunks are always word (two byte) aligned.
MOZ_ASSERT(mDecoder->GetResource()->Tell() % 2 == 0,
"LoadListChunk called with unaligned resource");
static const unsigned int MAX_CHUNK_SIZE = 1 << 16;
static_assert(uint64_t(MAX_CHUNK_SIZE) < UINT_MAX / sizeof(char),
"MAX_CHUNK_SIZE too large for enumerator.");
if (aChunkSize > MAX_CHUNK_SIZE || aChunkSize < 4) {
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 dom::HTMLMediaElement::MetadataTags;
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 (uint32_t(end - p) < length) {
break;
}
// Wrap the string, adjusting length to account for optional
// null termination in the chunk.
nsCString val(p, length);
if (length > 0 && 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;
}
