Fabio/Auxio
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

music: fix documentation errors

Browse source 
Fix erros in music documentation.
This commit is contained in:
Alexander Capehart 2022-12-25 20:43:40 -07:00
parent cc8f429044
commit 8fa1c92047
No known key found for this signature in database
GPG key ID: 37DBE3621FE9AD47
1 changed files with 25 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

61
app/src/main/java/org/oxycblt/auxio/music/Music.kt
View file

@ -187,15 +187,34 @@ sealed class Music : Item {
* @return A new auxio-style [UID].
*/
fun auxio(mode: MusicMode, updates: MessageDigest.() -> Unit): UID {
// Auxio hashes consist of the MD5 hash of the non-subjective, consistent
// tags in a music item. For easier use with MusicBrainz IDs, we transform
// this into a UUID too.
val uuid =
val digest =
MessageDigest.getInstance("SHA-256").run {
updates()
digestUUID()
digest()
}
// Convert the digest to a UUID. This does cleave off some of the hash, but this
// is considered okay.
val uuid = UUID(
digest[0]
.toLong()
.shl(56)
.or(digest[1].toLong().and(0xFF).shl(48))
.or(digest[2].toLong().and(0xFF).shl(40))
.or(digest[3].toLong().and(0xFF).shl(32))
.or(digest[4].toLong().and(0xFF).shl(24))
.or(digest[5].toLong().and(0xFF).shl(16))
.or(digest[6].toLong().and(0xFF).shl(8))
.or(digest[7].toLong().and(0xFF)),
digest[8]
.toLong()
.shl(56)
.or(digest[9].toLong().and(0xFF).shl(48))
.or(digest[10].toLong().and(0xFF).shl(40))
.or(digest[11].toLong().and(0xFF).shl(32))
.or(digest[12].toLong().and(0xFF).shl(24))
.or(digest[13].toLong().and(0xFF).shl(16))
.or(digest[14].toLong().and(0xFF).shl(8))
.or(digest[15].toLong().and(0xFF)))
return UID(Format.AUXIO, mode, uuid)
}
@ -237,7 +256,6 @@ sealed class Music : Item {
val mode =
MusicMode.fromIntCode(ids[0].toIntOrNull(16) ?: return null) ?: return null
val uuid = ids[1].toUuidOrNull() ?: return null
return UID(format, mode, uuid)
}
}
@ -1412,32 +1430,3 @@ private fun MessageDigest.update(n: Int?) {
update(0)
}
}
/**
* Digest a 8-byte+ hash into a [UUID].
* @return A [UUID] derived from the first 8 bytes of the digest.
*/
fun MessageDigest.digestUUID(): UUID {
val digest = digest()
return UUID(
digest[0]
.toLong()
.shl(56)
.or(digest[1].toLong().and(0xFF).shl(48))
.or(digest[2].toLong().and(0xFF).shl(40))
.or(digest[3].toLong().and(0xFF).shl(32))
.or(digest[4].toLong().and(0xFF).shl(24))
.or(digest[5].toLong().and(0xFF).shl(16))
.or(digest[6].toLong().and(0xFF).shl(8))
.or(digest[7].toLong().and(0xFF)),
digest[8]
.toLong()
.shl(56)
.or(digest[9].toLong().and(0xFF).shl(48))
.or(digest[10].toLong().and(0xFF).shl(40))
.or(digest[11].toLong().and(0xFF).shl(32))
.or(digest[12].toLong().and(0xFF).shl(24))
.or(digest[13].toLong().and(0xFF).shl(16))
.or(digest[14].toLong().and(0xFF).shl(8))
.or(digest[15].toLong().and(0xFF)))
}