) {
    if (byteCount < 0L || byteCount > source.size) {
      throw IndexOutOfBoundsException()
    }
    var mutablePos = pos
    var mutableByteCount = byteCount

    while (mutableByteCount > 0L) {
      val bytesWritten = fileChannel.transferFrom(source, mutablePos, mutableByteCount)
      mutablePos += bytesWritten
      mutableByteCount -= bytesWritten
    }
  }

  /**

  tag: T?,
) = apply {
  if (tag == null) {
    if (tags.isNotEmpty()) {
      (tags as MutableMap).remove(type)
    }
  } else {
    val mutableTags: MutableMap<KClass<*>, Any> =
      when {
        tags.isEmpty() -> mutableMapOf<KClass<*>, Any>().also { tags = it }
        else -> tags as MutableMap<KClass<*>, Any>
      }
    mutableTags[type] = tag
  }
}

import assertk.assertThat
import assertk.assertions.containsExactly
import java.net.InetAddress
import java.net.UnknownHostException
import okio.Buffer

class FakeDns : Dns {
  private val hostAddresses: MutableMap<String, List<InetAddress>> = mutableMapOf()
  private val requestedHosts: MutableList<String> = mutableListOf()
  private var nextAddress = 0xff000064L // 255.0.0.100 in IPv4; ::ff00:64 in IPv6.