NS_IMETHODIMP
nsMediaSniffer::GetMIMETypeFromContent(nsIRequest* aRequest,
const uint8_t* aData,
const uint32_t aLength,
nsACString& aSniffedType)
{
// For media, we want to sniff only if the Content-Type is unknown, or if it
// is application/octet-stream.
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
if (channel) {
nsAutoCString contentType;
nsresult rv = channel->GetContentType(contentType);
NS_ENSURE_SUCCESS(rv, rv);
if (!contentType.IsEmpty() &&
!contentType.EqualsLiteral(APPLICATION_OCTET_STREAM) &&
!contentType.EqualsLiteral(UNKNOWN_CONTENT_TYPE)) {
return NS_ERROR_NOT_AVAILABLE;
}
}
const uint32_t clampedLength = std::min(aLength, MAX_BYTES_SNIFFED);
for (uint32_t i = 0; i < mozilla::ArrayLength(sSnifferEntries); ++i) {
const nsMediaSnifferEntry& currentEntry = sSnifferEntries[i];
if (clampedLength < currentEntry.mLength || currentEntry.mLength == 0) {
continue;
}
bool matched = true;
for (uint32_t j = 0; j < currentEntry.mLength; ++j) {
if ((currentEntry.mMask[j] & aData[j]) != currentEntry.mPattern[j]) {
matched = false;
break;
}
}
if (matched) {
aSniffedType.AssignASCII(currentEntry.mContentType);
return NS_OK;
}
}
if (MatchesMP4(aData, clampedLength)) {
aSniffedType.AssignLiteral(VIDEO_MP4);
return NS_OK;
}
if (MatchesWebM(aData, clampedLength)) {
aSniffedType.AssignLiteral(VIDEO_WEBM);
return NS_OK;
}
if (MatchesMP3(aData, clampedLength)) {
aSniffedType.AssignLiteral(AUDIO_MP3);
return NS_OK;
}
// Could not sniff the media type, we are required to set it to
// application/octet-stream.
aSniffedType.AssignLiteral(APPLICATION_OCTET_STREAM);
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP
nsMediaSniffer::GetMIMETypeFromContent(nsIRequest* aRequest,
const uint8_t* aData,
const uint32_t aLength,
nsACString& aSniffedType)
{
const uint32_t clampedLength = NS_MIN(aLength, MAX_BYTES_SNIFFED);
for (uint32_t i = 0; i < NS_ARRAY_LENGTH(sSnifferEntries); ++i) {
const nsMediaSnifferEntry& currentEntry = sSnifferEntries[i];
if (clampedLength < currentEntry.mLength || currentEntry.mLength == 0) {
continue;
}
bool matched = true;
for (uint32_t j = 0; j < currentEntry.mLength; ++j) {
if ((currentEntry.mMask[j] & aData[j]) != currentEntry.mPattern[j]) {
matched = false;
break;
}
}
if (matched) {
aSniffedType.AssignASCII(currentEntry.mContentType);
return NS_OK;
}
}
if (MatchesMP4(aData, clampedLength)) {
aSniffedType.AssignLiteral(VIDEO_MP4);
return NS_OK;
}
// Could not sniff the media type, we are required to set it to
// application/octet-stream.
aSniffedType.AssignLiteral(APPLICATION_OCTET_STREAM);
return NS_ERROR_NOT_AVAILABLE;
}
