private Source source(Source source) {
      return new ForwardingSource(source) {
        long totalBytesRead = 0L;

        @Override public long read(Buffer sink, long byteCount) throws IOException {
          long bytesRead = super.read(sink, byteCount);
          // read() returns the number of bytes read, or -1 if this source is exhausted.
          totalBytesRead += bytesRead != -1 ? bytesRead : 0;

01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] responseBodyStart
01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] responseBodyEnd: byteCount=128
01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] connectionReleased
01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] callEnd
01-01 12:53:32.816 10999 11090 D OkHttp  : [54 ms] responseHeadersStart

  inner class FaultySink(sink: Sink, private val file: Path) : ForwardingSink(sink) {
    override fun write(
      source: Buffer,
      byteCount: Long,
    ) {
      if (writeFaults.contains(file)) {
        throw IOException("boom!")
      } else {
        super.write(source, byteCount)
      }
    }
  }

        this.nativeLanMan = readString(buffer, bufferIndex, start + this.byteCount, 255, this.isUseUnicode());
        bufferIndex += stringWireLength(this.nativeLanMan, bufferIndex);
        if ( !this.isExtendedSecurity() ) {
            this.primaryDomain = readString(buffer, bufferIndex, start + this.byteCount, 255, this.isUseUnicode());
            bufferIndex += stringWireLength(this.primaryDomain, bufferIndex);

 * sample of code points to detect unicode control characters commonly used in binary file
 * signatures.
 */
fun Buffer.isProbablyUtf8(): Boolean {
  try {
    val prefix = Buffer()
    val byteCount = size.coerceAtMost(64)
    copyTo(prefix, 0, byteCount)
    for (i in 0 until 16) {
      if (prefix.exhausted()) {
        break
      }
      val codePoint = prefix.readUtf8CodePoint()

        var closed = false

        override fun close() {
          closed = true
        }

        override fun read(
          sink: Buffer,
          byteCount: Long,
        ): Long {
          check(!closed)
          return data.read(sink, byteCount)
        }

        override fun timeout(): Timeout {
          return Timeout.NONE
        }
      }
    return source.buffer().asResponseBody(null, -1)
  }

        bufferIndex += stringWireLength( nativeOs, bufferIndex );
        nativeLanMan = readString( buffer, bufferIndex, start + byteCount, 255, useUnicode );
        bufferIndex += stringWireLength( nativeLanMan, bufferIndex );
        if (!extendedSecurity) {
            primaryDomain = readString(buffer, bufferIndex, start + byteCount, 255, useUnicode);
            bufferIndex += stringWireLength(primaryDomain, bufferIndex);
        }

        val buffer = Buffer()
        try {
          sink.use {
            source.use {
              while (true) {
                val byteCount = source.read(buffer, 8192L)
                if (byteCount == -1L) break
                sink.write(buffer, byteCount)
                sink.emit()
              }
            }
          }
        } catch (e: IOException) {

        var closed = false

        override fun close() {
          closed = true
        }

        override fun read(
          sink: Buffer,
          byteCount: Long,
        ): Long {
          check(!closed)
          return data.read(sink, byteCount)
        }

        override fun timeout(): Timeout {
          return Timeout.NONE
        }
      }
    return source.buffer().asResponseBody(null, -1)

    assertThat(body.bytes()).isEqualTo(text)
  }
}

abstract class ForwardingSource(
  val delegate: Source,
) : Source {
  override fun read(
    sink: Buffer,
    byteCount: Long,
  ): Long = delegate.read(sink, byteCount)

  override fun timeout() = delegate.timeout()

  override fun close() = delegate.close()