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Reformat shifting bytes #152

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merged 3 commits into from
Oct 3, 2024
Merged

Reformat shifting bytes #152

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c9a003b
Reformat shifting bytes
nodh Oct 1, 2024
b5d959c
Rename functions
nodh Oct 3, 2024
2b87948
Convert to infix functions
nodh Oct 3, 2024
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102 changes: 71 additions & 31 deletions ...le/src/commonMain/kotlin/at/asitplus/signum/indispensable/asn1/encoding/NumberEncoding.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -125,59 +125,99 @@ fun Long.toTwosComplementByteArray() = when {
fun Int.toTwosComplementByteArray() = toLong().toTwosComplementByteArray()

fun Int.Companion.fromTwosComplementByteArray(it: ByteArray) = when (it.size) {
4 -> (it[0].toInt() shl 24) or (it[1].toUByte().toInt() shl 16) or (it[2].toUByte()
.toInt() shl 8) or (it[3].toUByte().toInt())
4 -> it[0].shiftLeftFirstInt(24) or
(it[1] shiftLeftAsInt 16) or
(it[2] shiftLeftAsInt 8) or
(it[3] shiftLeftAsInt 0)

3 -> (it[0].toInt() shl 16) or (it[1].toUByte().toInt() shl 8) or (it[2].toUByte().toInt())
2 -> (it[0].toInt() shl 8) or (it[1].toUByte().toInt() shl 0)
1 -> (it[0].toInt())
3 -> it[0].shiftLeftFirstInt(16) or
(it[1] shiftLeftAsInt 8) or
(it[2] shiftLeftAsInt 0)

2 -> it[0].shiftLeftFirstInt(8) or
(it[1] shiftLeftAsInt 0)

1 -> it[0].shiftLeftFirstInt(0)
else -> throw IllegalArgumentException("Input with size $it is out of bounds for Int")
}

private infix fun Byte.shiftLeftAsInt(shift: Int) = this.toUByte().toInt() shl shift
private fun Byte.shiftLeftFirstInt(shift: Int) = toInt() shl shift

fun UInt.Companion.fromTwosComplementByteArray(it: ByteArray) =
Long.fromTwosComplementByteArray(it).let {
require((0 <= it) && (it <= 0xFFFFFFFFL)) { "Value $it is out of bounds for UInt" }
it.toUInt()
}

fun Long.Companion.fromTwosComplementByteArray(it: ByteArray) = when (it.size) {
8 -> (it[0].toLong() shl 56) or (it[1].toUByte().toLong() shl 48) or (it[2].toUByte().toLong() shl 40) or
(it[3].toUByte().toLong() shl 32) or (it[4].toUByte().toLong() shl 24) or
(it[5].toUByte().toLong() shl 16) or (it[6].toUByte().toLong() shl 8) or (it[7].toUByte().toLong())

7 -> (it[0].toLong() shl 48) or (it[1].toUByte().toLong() shl 40) or (it[2].toUByte().toLong() shl 32) or
(it[3].toUByte().toLong() shl 24) or (it[4].toUByte().toLong() shl 16) or
(it[5].toUByte().toLong() shl 8) or (it[6].toUByte().toLong())

6 -> (it[0].toLong() shl 40) or (it[1].toUByte().toLong() shl 32) or (it[2].toUByte().toLong() shl 24) or
(it[3].toUByte().toLong() shl 16) or (it[4].toUByte().toLong() shl 8) or (it[5].toUByte().toLong())

5 -> (it[0].toLong() shl 32) or (it[1].toUByte().toLong() shl 24) or (it[2].toUByte().toLong() shl 16) or
(it[3].toUByte().toLong() shl 8) or (it[4].toUByte().toLong())

4 -> (it[0].toLong() shl 24) or (it[1].toUByte().toLong() shl 16) or (it[2].toUByte().toLong() shl 8) or
(it[3].toUByte().toLong())

3 -> (it[0].toLong() shl 16) or (it[1].toUByte().toLong() shl 8) or (it[2].toUByte().toLong())
2 -> (it[0].toLong() shl 8) or (it[1].toUByte().toLong() shl 0)
1 -> (it[0].toLong())
8 -> it[0].shiftLeftFirstLong(56) or
(it[1] shiftLeftAsLong 48) or
(it[2] shiftLeftAsLong 40) or
(it[3] shiftLeftAsLong 32) or
(it[4] shiftLeftAsLong 24) or
(it[5] shiftLeftAsLong 16) or
(it[6] shiftLeftAsLong 8) or
(it[7] shiftLeftAsLong 0)

7 -> it[0].shiftLeftFirstLong(48) or
(it[1] shiftLeftAsLong 40) or
(it[2] shiftLeftAsLong 32) or
(it[3] shiftLeftAsLong 24) or
(it[4] shiftLeftAsLong 16) or
(it[5] shiftLeftAsLong 8) or
(it[6] shiftLeftAsLong 0)

6 -> it[0].shiftLeftFirstLong(40) or
(it[1] shiftLeftAsLong 32) or
(it[2] shiftLeftAsLong 24) or
(it[3] shiftLeftAsLong 16) or
(it[4] shiftLeftAsLong 8) or
(it[5] shiftLeftAsLong 0)

5 -> it[0].shiftLeftFirstLong(32) or
(it[1] shiftLeftAsLong 24) or
(it[2] shiftLeftAsLong 16) or
(it[3] shiftLeftAsLong 8) or
(it[4] shiftLeftAsLong 0)

4 -> it[0].shiftLeftFirstLong(24) or
(it[1] shiftLeftAsLong 16) or
(it[2] shiftLeftAsLong 8) or
(it[3] shiftLeftAsLong 0)

3 -> it[0].shiftLeftFirstLong(16) or
(it[1] shiftLeftAsLong 8) or
(it[2] shiftLeftAsLong 0)

2 -> it[0].shiftLeftFirstLong(8) or
(it[1] shiftLeftAsLong 0)

1 -> it[0].shiftLeftFirstLong(0)
else -> throw IllegalArgumentException("Input with size $it is out of bounds for Long")
}

private infix fun Byte.shiftLeftAsLong(shift: Int) = this.toUByte().toLong() shl shift
private fun Byte.shiftLeftFirstLong(shift: Int) = toLong() shl shift

fun ULong.Companion.fromTwosComplementByteArray(it: ByteArray) = when {
((it.size == 9) && (it[0] == 0.toByte())) ->
(it[1].toUByte().toULong() shl 56) or (it[2].toUByte().toULong() shl 48) or (it[3].toUByte()
.toULong() shl 40) or
(it[4].toUByte().toULong() shl 32) or (it[5].toUByte().toULong() shl 24) or
(it[6].toUByte().toULong() shl 16) or (it[7].toUByte().toULong() shl 8) or
(it[8].toUByte().toULong())
((it.size == 9) && (it[0] == 0.toByte())) -> it.shiftLeftAsULong(1, 56) or
it.shiftLeftAsULong(2, 48) or
it.shiftLeftAsULong(3, 40) or
it.shiftLeftAsULong(4, 32) or
it.shiftLeftAsULong(5, 24) or
it.shiftLeftAsULong(6, 16) or
it.shiftLeftAsULong(7, 8) or
it.shiftLeftAsULong(8, 0)

else -> Long.fromTwosComplementByteArray(it).let {
require(it >= 0) { "Value $it is out of bounds for ULong" }
it.toULong()
}
}

private fun ByteArray.shiftLeftAsULong(index: Int, shift: Int) = this[index].toUByte().toULong() shl shift

/** Encodes an unsigned Long to a minimum-size unsigned byte array */
fun Long.toUnsignedByteArray(): ByteArray {
require(this >= 0)
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