hexdump -C compatible dump in Scala

dump.scala

def dump(s: java.io.InputStream): Unit = {
  val buf = new StringBuilder(64)
  val chars = new StringBuilder(32)
  var offset = 0

  def dumpLine = {
    println("%08x  %48s |%16s|".format(offset, buf, chars))
    buf.setLength(0)
    chars.setLength(0)
    offset += 0x10
  }

  var ch = s.read
  var i: Int = 0
  while (ch != -1) {
    if (i != 0) {
      if (i % 16 == 0) dumpLine
      else if (i % 8 == 0) buf.append(" ")
    }

    buf.append("%02x ".format(ch))
    if (ch < 32 || ch > 126) chars.append('.')
    else chars.append(ch.toChar)
    ch = s.read
    i += 1
  }

  if (buf.length > 0) dumpLine
}