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A Scala library for JSON (de)serialization

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package sjsonnew

object BUtil {
  def fromHex(hex0: String): Array[Byte] =
    {
      def doFromHex(hex: String): Array[Byte] =
        {
          require((hex.length & 1) == 0, "Hex string must have length 2n.")
          val array = new Array[Byte](hex.length >> 1)
          for (i <- 0 until hex.length by 2) {
            val c1 = hex.charAt(i)
            val c2 = hex.charAt(i + 1)
            array(i >> 1) = ((fromHex(c1) << 4) | fromHex(c2)).asInstanceOf[Byte]
          }
          array
        }
      doFromHex(hex0.replaceAll("\\s", ""))
    }
  private def fromHex(c: Char): Int =
    {
      val b =
        if (c >= '0' && c <= '9')
          (c - '0')
        else if (c >= 'a' && c <= 'f')
          (c - 'a') + 10
        else if (c >= 'A' && c <= 'F')
          (c - 'A') + 10
        else
          throw new RuntimeException("Invalid hex character: '" + c + "'.")
      b
    }

  def toHex(bytes: Array[Byte]): String =
    {
      val buffer = new StringBuilder(bytes.length * 2)
      for (i <- 0 until bytes.length) {
        val b = bytes(i)
        val bi: Int = if (b < 0) b + 256 else b
        buffer append toHex((bi >>> 4).asInstanceOf[Byte])
        buffer append toHex((bi & 0x0F).asInstanceOf[Byte])
      }
      buffer.toString
    }

  private def toHex(b: Byte): Char =
    {
      require(b >= 0 && b <= 15, "Byte " + b + " was not between 0 and 15")
      if (b < 10)
        ('0'.asInstanceOf[Int] + b).asInstanceOf[Char]
      else
        ('A'.asInstanceOf[Int] + (b - 10)).asInstanceOf[Char]
    }
}