Scala: InputStream to Array[Byte]

Question

With Scala, what is the best way to read from an InputStream to a bytearray?

I can see that you can convert an InputStream to char array

Source.fromInput         


        

Answer 1

How about buffered version of solution based on streams plus ByteArraOutputStream to minimize boilerplate around final array growing?

val EOF: Int = -1

def readBytes(is: InputStream, bufferSize: Int): Array[Byte] = {
  val buf = Array.ofDim[Byte](bufferSize)
  val out = new ByteArrayOutputStream(bufferSize)

  Stream.continually(is.read(buf)) takeWhile { _ != EOF } foreach { n =>
    out.write(buf, 0, n)
  }

  out.toByteArray
}