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chore: rename some local variables to align with the stdlib
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@TheMrMilchmann
TheMrMilchmann committed Jan 3, 2025
1 parent 3d814e2 commit 4f9c1c4
Showing 1 changed file with 33 additions and 32 deletions.
65 changes: 33 additions & 32 deletions src/commonMain/kotlin/com/osmerion/kotlin/io/encoding/Base32.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -331,76 +331,77 @@ public open class Base32 private constructor(
}

private fun decodeImpl(source: ByteArray, destination: ByteArray, destinationOffset: Int, startIndex: Int, endIndex: Int): Int {
val alphabet = if (isHexExtended) base32HexDecodeMap else base32DecodeMap
var offset = startIndex
val decodeMap = if (isHexExtended) base32HexDecodeMap else base32DecodeMap

var sourceIndex = startIndex
var destinationIndex = destinationOffset

var dstOffset = destinationOffset
var bits: Long = 0
var shiftTo = 35

val requiresPadding = ((startIndex - endIndex) % symbolsPerGroup) != 0
var hasPadding = false

while (offset < endIndex) {
if (shiftTo == 35 && offset < endIndex - 8) {
val dstLength: Int = this.decodeBlock(source, offset, endIndex, destination, dstOffset)
while (sourceIndex < endIndex) {
if (shiftTo == 35 && sourceIndex < endIndex - 8) {
val dstLength: Int = this.decodeBlock(source, sourceIndex, endIndex, destination, destinationIndex)
val charsDecoded = (dstLength / 5) * 8

offset += charsDecoded
dstOffset += dstLength
sourceIndex += charsDecoded
destinationIndex += dstLength
}

if (offset >= endIndex) {
if (sourceIndex >= endIndex) {
break
}

var b: Int = source[offset++].toInt() and 0xFF
if ((alphabet[b].also { b = it }) < 0) {
var b: Int = source[sourceIndex++].toInt() and 0xFF
if ((decodeMap[b].also { b = it }) < 0) {
if (b == -2) { // padding byte '='
if (shiftTo == 35 || shiftTo == 30 || shiftTo == 5 ||
shiftTo == 25 && (offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte()) ||
shiftTo == 20 && (offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte()) ||
shiftTo == 15 && (offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte()) ||
shiftTo == 10 && (offset == endIndex || source[offset++] != '='.code.toByte() || offset == endIndex || source[offset++] != '='.code.toByte())
shiftTo == 25 && (sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte()) ||
shiftTo == 20 && (sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte()) ||
shiftTo == 15 && (sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte()) ||
shiftTo == 10 && (sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte() || sourceIndex == endIndex || source[sourceIndex++] != '='.code.toByte())
) {
throw IllegalArgumentException("The last unit of input does not have enough bits")
}

hasPadding = true
break
} else {
throw IllegalArgumentException("Illegal base32 character " + source[offset - 1].toString(radix = 16))
throw IllegalArgumentException("Illegal base32 character " + source[sourceIndex - 1].toString(radix = 16))
}
}

bits = bits or (b.toLong() shl shiftTo)
shiftTo -= 5
shiftTo -= bitsPerSymbol

if (shiftTo < 0) {
destination[dstOffset++] = (bits shr 32).toByte()
destination[dstOffset++] = (bits shr 24).toByte()
destination[dstOffset++] = (bits shr 16).toByte()
destination[dstOffset++] = (bits shr 8).toByte()
destination[dstOffset++] = (bits).toByte()
destination[destinationIndex++] = (bits shr 32).toByte()
destination[destinationIndex++] = (bits shr 24).toByte()
destination[destinationIndex++] = (bits shr 16).toByte()
destination[destinationIndex++] = (bits shr 8).toByte()
destination[destinationIndex++] = (bits).toByte()
shiftTo = 35
bits = 0
}
}

if (shiftTo == 0 || shiftTo == 5) {
destination[dstOffset++] = (bits shr 32).toByte()
destination[dstOffset++] = (bits shr 24).toByte()
destination[dstOffset++] = (bits shr 16).toByte()
destination[dstOffset++] = (bits shr 8).toByte()
destination[destinationIndex++] = (bits shr 32).toByte()
destination[destinationIndex++] = (bits shr 24).toByte()
destination[destinationIndex++] = (bits shr 16).toByte()
destination[destinationIndex++] = (bits shr 8).toByte()
} else if (shiftTo == 10) {
destination[dstOffset++] = (bits shr 32).toByte()
destination[dstOffset++] = (bits shr 24).toByte()
destination[dstOffset++] = (bits shr 16).toByte()
destination[destinationIndex++] = (bits shr 32).toByte()
destination[destinationIndex++] = (bits shr 24).toByte()
destination[destinationIndex++] = (bits shr 16).toByte()
} else if (shiftTo == 15) {
destination[dstOffset++] = (bits shr 32).toByte()
destination[dstOffset++] = (bits shr 24).toByte()
destination[destinationIndex++] = (bits shr 32).toByte()
destination[destinationIndex++] = (bits shr 24).toByte()
} else if ((shiftTo == 20) or (shiftTo == 25)) {
destination[dstOffset++] = (bits shr 32).toByte()
destination[destinationIndex++] = (bits shr 32).toByte()
} else if (shiftTo == 30) {
throw IllegalArgumentException("Last unit does not have enough valid bits")
}
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