Tar as the JSON of UNIX

tarmap.scala

import org.kamranzafar.jtar._
import java.io.{ByteArrayInputStream, ByteArrayOutputStream}
import scala.collection.mutable.ArrayBuffer
import com.google.common.base.Charsets

object Tar {
  def toTar(entries: Map[String,String]): Array[Byte] = {
    val bytesOut = new ByteArrayOutputStream()
    val archive  = new TarOutputStream(bytesOut)
    val mTime: Long = System.currentTimeMillis() / 1000
    val paired = for ((name, data) <- entries) yield {
      val bytes: Array[Byte] = data.getBytes(Charsets.UTF_8)
      (TarHeader.createHeader(name, bytes.length, mTime, false), bytes)
    }
    for ((header, bytes) <- paired) {
      val entry = new TarEntry(header)
      entry.setGroupId(0)
      entry.setUserId(0)
      archive.putNextEntry(entry)
      archive.write(bytes)
    }
    archive.close()
    bytesOut.toByteArray
  }

  def unTar(tar: Array[Byte]): Map[String,String] = {
    val asTar = new TarInputStream(new ByteArrayInputStream(tar))
    var entry: TarEntry = null
    val entries: ArrayBuffer[(String, String)] = new ArrayBuffer()
    while ({ entry = asTar.getNextEntry ; entry != null }) {
      val name = entry.getName
      if (name.last != '/') {
        val data = new Array[Byte](entry.getSize.toInt)
        asTar.read(data)
        entries.append((name, new String(data, Charsets.UTF_8)))
      }
    }
    entries.toMap
  }
}