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/*
* Copyright 2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kotlinx.serialization.internal
import kotlinx.io.ByteBuffer
import kotlinx.io.IOException
import kotlinx.io.InputStream
internal fun InputStream.readExactNBytes(bytes: Int): ByteArray {
val array = ByteArray(bytes)
var read = 0
while (read < bytes) {
val i = this.read(array, read, bytes - read)
if (i == -1) throw IOException("Unexpected EOF")
read += i
}
return array
}
internal fun InputStream.readToByteBuffer(bytes: Int): ByteBuffer {
val arr = readExactNBytes(bytes)
val buf = ByteBuffer.allocate(bytes)
buf.put(arr).flip()
return buf
}
object HexConverter {
fun parseHexBinary(s: String): ByteArray {
val len = s.length
if (len % 2 != 0) {
throw IllegalArgumentException("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])
if (h == -1 || l == -1) {
throw IllegalArgumentException("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
}
private const val hexCode = "0123456789ABCDEF"
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().toLowerCase() else r.toString()
}
fun toHexString(n: Int) = printHexBinary(ByteBuffer.allocate(4).putInt(n).flip().array(), true)
.trimStart('0').takeIf { it.isNotEmpty() } ?: "0"
}
fun ByteBuffer.getUnsignedByte(): Int = this.get().toInt() and 0xff
fun ByteBuffer.getUnsignedShort(): Int = this.getShort().toInt() and 0xffff
fun ByteBuffer.getUnsignedInt(): Long = this.getInt().toLong() and 0xffffffffL
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