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import java.math.BigInteger
/**
* This class holds information about a single QID.
*/
class QID {
/**
* Does the QID represent a directory?
*/
val isDirectory get() = getIsDirectory()
/**
* Does the QID represent an append-only file?
*/
val isAppendOnly get() = getIsAppendOnly()
/**
* Does the QID represent an exclusive-use file?
*/
val isExclusive get() = getIsExclusive()
/**
* Does the QID represent a temporary file?
*/
val isTemporary get() = getIsTemporary()
/**
* The QID type.
*/
val type: UByte
/**
* The QID file version.
*/
val version: UInt
/**
* The QID path.
*/
val path: ULong
/**
* Constructor for a QID with separate fields. See the `stat(5)` manual page for more information about [type],
* [version], and [path].
*
* @param type The QID type.
* @param version The QID file version.
* @param path The QID path.
*/
constructor(type: UByte, version: UInt, path: ULong) {
this.type = type
this.version = version
this.path = path
}
/**
* Constructor for raw QID data. Only the first 13 elements are read.
*
* @param raw The raw QID data.
* @throws IllegalArgumentException if [raw] does not have at least 13 elements.
*/
constructor(raw: List<UByte>) {
require(raw.size >= 13)
this.type = raw.first()
val rawVersion = raw.slice(1..4)
val rawPath = raw.slice(5..12)
this.version = InMessage.convInteger(rawVersion, 0, rawVersion.size).toInt().toUInt()
this.path = InMessage.convInteger(rawPath, 0, rawPath.size).toLong().toULong()
}
/**
* Check bit values in [type]. In case of multiple bits, the method returns true if at least one of them is 1.
*
* @param bits A byte whose bits set to 1 are checked.
*/
private fun checkTypeBits(bits: UByte): Boolean {
return this.type.and(bits) != 0u.toUByte()
}
private fun getIsDirectory(): Boolean {
return checkTypeBits(0x80u)
}
private fun getIsAppendOnly(): Boolean {
return checkTypeBits(0x40u)
}
private fun getIsExclusive(): Boolean {
return checkTypeBits(0x20u)
}
private fun getIsTemporary(): Boolean {
return checkTypeBits(0x04u)
}
fun toRaw(): List<UByte> {
var bytes: List<UByte> = emptyList()
bytes += this.type
bytes += OutMessage.convIntegerToBytes(BigInteger(this.version.toString()), 4u)
bytes += OutMessage.convIntegerToBytes(BigInteger(this.path.toString()), 8u)
return bytes
}
}
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