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package magic
import (
"bytes"
)
/*
NOTE:
In May 2003, two Internet RFCs were published relating to the format.
The Ogg bitstream was defined in RFC 3533 (which is classified as
'informative') and its Internet content type (application/ogg) in RFC
3534 (which is, as of 2006, a proposed standard protocol). In
September 2008, RFC 3534 was obsoleted by RFC 5334, which added
content types video/ogg, audio/ogg and filename extensions .ogx, .ogv,
.oga, .spx.
See:
https://tools.ietf.org/html/rfc3533
https://developer.mozilla.org/en-US/docs/Web/HTTP/Configuring_servers_for_Ogg_media#Serve_media_with_the_correct_MIME_type
https://github.com/file/file/blob/master/magic/Magdir/vorbis
*/
// Ogg matches an Ogg file.
func Ogg(raw []byte, limit uint32) bool {
return bytes.HasPrefix(raw, []byte("\x4F\x67\x67\x53\x00"))
}
// OggAudio matches an audio ogg file.
func OggAudio(raw []byte, limit uint32) bool {
return len(raw) >= 37 && (bytes.HasPrefix(raw[28:], []byte("\x7fFLAC")) ||
bytes.HasPrefix(raw[28:], []byte("\x01vorbis")) ||
bytes.HasPrefix(raw[28:], []byte("OpusHead")) ||
bytes.HasPrefix(raw[28:], []byte("Speex\x20\x20\x20")))
}
// OggVideo matches a video ogg file.
func OggVideo(raw []byte, limit uint32) bool {
return len(raw) >= 37 && (bytes.HasPrefix(raw[28:], []byte("\x80theora")) ||
bytes.HasPrefix(raw[28:], []byte("fishead\x00")) ||
bytes.HasPrefix(raw[28:], []byte("\x01video\x00\x00\x00"))) // OGM video
}
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