) {
      private val headerList = mutableListOf<Header>()
      private val source: BufferedSource = source.buffer()

      // Visible for testing.
      @JvmField var dynamicTable = arrayOfNulls<Header>(8)

      // Array is populated back to front, so new entries always have lowest index.
      private var nextHeaderIndex = dynamicTable.size - 1

      @JvmField var headerCount = 0

  }

  return Headers(namesAndValues)
}

internal fun Map<String, String>.commonToHeaders(): Headers {
  // Make a defensive copy and clean it up.
  val namesAndValues = arrayOfNulls<String>(size * 2)
  var i = 0
  for ((k, v) in this) {
    val name = k.trim()
    val value = v.trim()
    headersCheckName(name)
    headersCheckValue(value, name)
    namesAndValues[i] = name