BytesToString.Scala

import io.Codec
import java.nio.ByteBuffer

val UTF8 = “UTF-8”
val ISO8859 = “ISO-8859–1”
val REPLACEMENT_CHAR = ‘\uFFFD’

def bytesToString(bytes: Array[Byte], encoding: String) = {
  val upper = encoding.toUpperCase
  val codec = if (ISO8859 == upper) Codec.ISO8859 else Codec.UTF8
  val decoded = codec.decode(ByteBuffer.wrap(bytes)).toString
 
  if (!decoded.contains(REPLACEMENT_CHAR)) {
    decoded
  } else {
    val otherCodec = if (ISO8859 == upper) Codec.UTF8 else Codec.ISO8859
    val otherDecoded = otherCodec.decode(ByteBuffer.wrap(bytes)).toString
 
    if (!otherDecoded.contains(REPLACEMENT_CHAR)) {
      otherDecoded
    } else {
      val utf8 = if (ISO8859 == upper) otherDecoded else decoded
      utf8.replace(REPLACEMENT_CHAR, ‘?’)
    }
  }
}