Create an #Enumeratee transforming Bytes in lines. Compose it with am #Iteratee or an #Enumerator

parser.scala

private val LB = "\r\n"

val concatLine: Iteratee[Parsing.MatchInfo[Array[Byte]],String] =
  (Enumeratee.breakE[Parsing.MatchInfo[Array[Byte]]](_.isMatch) ><>
   Enumeratee.collect{ case Parsing.Unmatched(bytes) => new String(bytes)} &>>
   Iteratee.consume()).flatMap(r => Iteratee.head.map(_ => r))

def lineParser =
  Enumeratee.map{ s: Array[Byte] =>
    (if(s.contains(LB + LB))
      Parsing.Matched(s)
    else
      Parsing.Unmatched(s)): Parsing.MatchInfo[Array[Byte]]
  } ><>
  Enumeratee.grouped(concatLine) ><>
  Enumeratee.filter((s: String) => !s.trim.isEmpty)