package it.unisannio.assd.tkn

import java.math.BigInteger
import java.nio.ByteBuffer
import java.nio.ByteOrder

fun Short.toLeByteArray(): ByteArray {
    val buffer = ByteBuffer
        .allocate(2).apply {
            order(ByteOrder.LITTLE_ENDIAN)
            putShort(this@toLeByteArray)
        }

    return buffer.array()
}

fun ByteArray.toHexString(): String {
    val builder = StringBuilder()
    this.map { String.format("%02x", it) }
        .forEach { builder.append(it) }
    return builder.toString()
}

fun String.toHexByteArray(): ByteArray = BigInteger(this, 16).toByteArray()

fun ByteBuffer.read(n: Int): ByteArray {
    val bytes = ByteArray(n)
    this.get(bytes)
    return bytes
}