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/*
* Copyright 2017-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.serialization.test
object InternalHexConverter {
private const val hexCode = "0123456789ABCDEF"
fun parseHexBinary(s: String): ByteArray {
val len = s.length
require(len % 2 == 0) { "HexBinary string must be even length" }
val bytes = ByteArray(len / 2)
var i = 0
while (i < len) {
val h = hexToInt(s[i])
val l = hexToInt(s[i + 1])
require(!(h == -1 || l == -1)) { "Invalid hex chars: ${s[i]}${s[i+1]}" }
bytes[i / 2] = ((h shl 4) + l).toByte()
i += 2
}
return bytes
}
private fun hexToInt(ch: Char): Int = when (ch) {
in '0'..'9' -> ch - '0'
in 'A'..'F' -> ch - 'A' + 10
in 'a'..'f' -> ch - 'a' + 10
else -> -1
}
fun printHexBinary(data: ByteArray, lowerCase: Boolean = false): String {
val r = StringBuilder(data.size * 2)
for (b in data) {
r.append(hexCode[b.toInt() shr 4 and 0xF])
r.append(hexCode[b.toInt() and 0xF])
}
return if (lowerCase) r.toString().lowercase() else r.toString()
}
fun toHexString(n: Int): String {
val arr = ByteArray(4)
for (i in 0 until 4) {
arr[i] = (n shr (24 - i * 8)).toByte()
}
return printHexBinary(arr, true).trimStart('0').takeIf { it.isNotEmpty() } ?: "0"
}
}
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