// Skip comment and empty lines.
    when (select(optionsDelimiter)) {
      DELIMITER_HASH -> {
        skipRestOfLine()
        continue
      }

      DELIMITER_NEWLINE -> {
        continue
      }

      DELIMITER_DOT, DELIMITER_SPACE, DELIMITER_SEMICOLON -> {
        throw IOException("unexpected delimiter")
      }
    }

    // "002F" or "0000..002C"

  var i = pos
  while (i < limit) {
    if (b == address.size) return null // Too many groups.

    // Read a delimiter.
    if (i + 2 <= limit && input.startsWith("::", startIndex = i)) {
      // Compression "::" delimiter, which is anywhere in the input, including its prefix.
      if (compress != -1) return null // Multiple "::" delimiters.
      i += 2
      b += 2
      compress = b
      if (i == limit) break
    } else if (b != 0) {

 * if there is no such character.
 */
fun String.delimiterOffset(
  delimiter: Char,
  startIndex: Int = 0,
  endIndex: Int = length,
): Int {
  for (i in startIndex until endIndex) {
    if (this[i] == delimiter) return i
  }
  return endIndex
}

/**
 * Returns the index of the first character in this string that is either a control character (like

  }
}

/**
 * Consumes and returns a non-empty token, terminating at special characters in
 * [TOKEN_DELIMITERS]. Returns null if the buffer is empty or prefixed with a delimiter.
 */
private fun Buffer.readToken(): String? {
  var tokenSize = indexOfElement(TOKEN_DELIMITERS)
  if (tokenSize == -1L) tokenSize = size

  return when {
    tokenSize != 0L -> readUtf8(tokenSize)
    else -> null
  }

    assertThat(part.headers).isEqualTo(headersOf())
    assertThat(part.body.readUtf8()).isEqualTo("abcd")

    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `skip whitespace after close delimiter`() {
    val multipart =
      """
      |--simple boundary
      |
      |abcd
      |--simple boundary--
      """.trimMargin()

    @get:JvmName("boundary") val boundary: String,
  ) : Closeable {
    /** This delimiter typically precedes the first part. */
    private val dashDashBoundary =
      Buffer()
        .writeUtf8("--")
        .writeUtf8(boundary)
        .readByteString()

    /**
     * This delimiter typically precedes all subsequent parts. It may also precede the first part
     * if the body contains a preamble.

    var b = 0
    for (codePoint in input) {
      if (codePoint < INITIAL_N) {
        result.writeByte(codePoint)
        b++
      }
    }

    // Copy a delimiter if any basic code points were emitted.
    if (b > 0) result.writeByte('-'.code)

    var n = INITIAL_N
    var delta = 0
    var bias = INITIAL_BIAS
    var h = b
    while (h < input.size) {

 * Fix: Do not directly support any authentication schemes other than "Basic".
 * Fix: Respect read timeouts on recycled connections.
 * Fix: Transmit multiple cookie values as a single header with delimiter.
 * Fix: Ensure `null` is never returned from a connection's `getHeaderFields()`.
 * Fix: Persist proper `Content-Encoding` header to cache for GZip responses.

    }

  /**
   * Removes and returns the stream's received response headers, blocking if necessary until headers
   * have been received. If the returned list contains multiple blocks of headers the blocks will be
   * delimited by 'null'.
   *
   * @param callerIsIdle true if the caller isn't sending any more bytes until the peer responds.
   *     This is true after a `Expect-Continue` request, false for duplex requests, and false for

0F0B          ; valid                                  # 2.0  TIBETAN MARK INTERSYLLABIC TSHEG
0F0C          ; mapped                 ; 0F0B          # 2.0  TIBETAN MARK DELIMITER TSHEG BSTAR
0F0D..0F17    ; valid                  ;      ; NV8    # 2.0  TIBETAN MARK SHAD..TIBETAN ASTROLOGICAL SIGN SGRA GCAN -CHAR RTAGS