Data+InputStream.swift

extension Data {
  init(inputStream: InputStream) throws {
    inputStream.open()
    defer { inputStream.close() }
    self.init()
    let bufferSize = 512
    var readBuffer = [UInt8](repeating: 0, count: bufferSize)
    while inputStream.hasBytesAvailable {
      let readBytes = inputStream.read(&readBuffer, maxLength: bufferSize)
      switch readBytes {
        case 0:
          break
        case ..<0:
          throw inputStream.streamError!
        default:
          append(readBuffer, count: readBytes)
        }
      }
  }
}