callback.onRetryChange(retryMs)
          }
        }

        -1 -> {
          val lineEnd = source.indexOfElement(CRLF)
          if (lineEnd != -1L) {
            // Skip the line and newline
            source.skip(lineEnd)
            source.select(options)
          } else {
            return false // No more newlines.
          }
        }

        else -> throw AssertionError()
      }

private fun BufferedSource.skipWhitespace() {
  while (!exhausted()) {
    if (buffer[0] != ' '.code.toByte()) return
    skip(1L)
  }
}

private fun BufferedSource.skipRestOfLine() {
  when (val newline = indexOf('\n'.code.toByte())) {
    -1L -> skip(buffer.size) // Exhaust this source.
    else -> skip(newline + 1)
  }
}

/**
 * Reads lines from `IdnaMappingTable.txt`.
 *

          // Append new upstream bytes into the buffer. Trim it to its max size.
          buffer.write(upstreamBuffer, upstreamBytesRead)
          if (buffer.size > bufferMaxSize) {
            buffer.skip(buffer.size - bufferMaxSize)
          }

          // Now that the file and buffer have bytes, adjust upstreamPos.
          ******@****.***amPos += upstreamBytesRead
        }

        return bytesRead

        '{'.code,
        '}'.code,
        '|'.code,
        '^'.code,
        '\''.code,
        ';'.code,
        '='.code,
        '@'.code,
      )
      .override(
        Encoding.SKIP,
        ':'.code,
        '/'.code,
        '\\'.code,
        '?'.code,
        '#'.code,
      )
      .test(UrlComponentEncodingTester.Component.USER)
  }

  @Test

        source.skip(dashDashBoundary.size.toLong())
      } else {
        // This is a subsequent part or a preamble. Skip until "\r\n--" followed by the boundary.
        while (true) {
          val toSkip = currentPartBytesRemaining(maxResult = 8192)
          if (toSkip == 0L) break
          source.skip(toSkip)
        }
        source.skip(crlfDashDashBoundary.size.toLong())
      }

      )

    assertFailsWith<ProtocolException> {
      parts.nextPart()
    }.also { expected ->
      assertThat(expected).hasMessage("expected at least 1 part")
    }
  }

  @Test fun `skip preamble`() {
    val multipart =
      """
      |this is the preamble! it is invisible to application code
      |
      |--simple boundary
      |
      |abcd
      |--simple boundary--

  val onException: (IOException) -> Unit,
) : ForwardingSink(delegate) {
  private var hasErrors = false

  override fun write(
    source: Buffer,
    byteCount: Long,
  ) {
    if (hasErrors) {
      source.skip(byteCount)
      return
    }
    try {
      super.write(source, byteCount)
    } catch (e: IOException) {
      hasErrors = true
      onException(e)
    }
  }

  override fun flush() {

      FormBody.Builder()
        .add("a", String(intArrayOf('b'.code, codePoint, 'c'.code), 0, 3))
        .build()
    val buffer = Buffer()
    body.writeTo(buffer)
    buffer.skip(3) // Skip "a=b" prefix.
    return buffer.readUtf8(buffer.size - 1) // Skip the "c" suffix.
  }

  @Test
  fun manualCharset() {
    val body =
      FormBody.Builder(StandardCharsets.ISO_8859_1)
        .add("name", "Nicolás")

    if (length < 0) {
      // compressed name pointer, first two bits are 1
      // drop second byte of compression offset
      source.skip(1)
    } else {
      while (length > 0) {
        // skip each part of the domain name
        source.skip(length.toLong())
        length = source.readByte().toInt()
      }
    }
  }

 *  6. Read from and close that source.
 *
 * Exchanges that do not have a request body may skip creating and closing the request body.
 * Exchanges that do not have a response body can call
 * [newFixedLengthSource(0)][newFixedLengthSource] and may skip reading and closing that source.
 */
class Http1ExchangeCodec(
  /** The client that configures this stream. May be null for HTTPS proxy tunnels. */