/** Byte 0 reserved flag 3. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV3 = 16

  /** Byte 0 mask for the frame opcode. */
  internal const val B0_MASK_OPCODE = 15

  /** Flag in the opcode which indicates a control frame. */
  internal const val OPCODE_FLAG_CONTROL = 8

  /**
   * Byte 1 flag for whether the payload data is masked.
   *
   * If this flag is set, the next four

			return frame
		}
	}

	return runtime.Frame{}
}

// FileWithLineNum return the file name and line number of the current file
func FileWithLineNum() string {
	// Keep FileWithLineNum one frame outer than CallerFrame to preserve pre-v1.31.1 semantics.
	frame := callerFrame(4)
	if frame.PC != 0 {
		return string(strconv.AppendInt(append([]byte(frame.File), ':'), int64(frame.Line), 10))
	}

	return ""
}

        }

        // Write a frame.
        val length = (end - start).toInt()
        outputStream.write(outBytes, start.toInt(), length)

        // If the last frame was truncated, immediately close the connection.
        if (truncated) {
          socket.close()
        }
      } else {
        // read a frame
        val inFrame = InFrame(i, reader)

      direction,
      streamId,
      length,
      formattedType,
      formattedFlags,
    )
  }

  /**
   * Returns a human-readable representation of a `WINDOW_UPDATE` frame. This frame includes the
   * window size increment instead of flags.
   */
  fun frameLogWindowUpdate(
    inbound: Boolean,
    streamId: Int,
    length: Int,
    windowSizeIncrement: Long,
  ): String {

		</postConstruct>
		<postConstruct name="put">
			<arg>"//AREA"</arg>
			<arg>"href"</arg>
		</postConstruct>
		<postConstruct name="put">
			<arg>"//FRAME"</arg>
			<arg>"src"</arg>
		</postConstruct>
		<postConstruct name="put">
			<arg>"//IFRAME"</arg>
			<arg>"src"</arg>
		</postConstruct>
		<postConstruct name="put">
			<arg>"//IMG"</arg>
			<arg>"src"</arg>
		</postConstruct>

import okhttp3.internal.ws.WebSocketProtocol.validateCloseCode
import okio.Buffer
import okio.BufferedSink
import okio.ByteString

/**
 * An [RFC 6455][rfc_6455]-compatible WebSocket frame writer.
 *
 * This class is not thread safe.
 *
 * [rfc_6455]: http://tools.ietf.org/html/rfc6455
 */
class WebSocketWriter(
  private val isClient: Boolean,
  val sink: BufferedSink,
  val random: Random,

// Continuation Message
// ====================
// Header specification
// --------------------
// Continuation messages contain two headers, as follows:
// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-cont.png
//
// Payload specification
// ---------------------
// Continuation messages have no payload.
func genContinuationMessage() {
	buf := new(bytes.Buffer)

	buf.WriteByte(13)

    /** HTTP/2: The peer must not send a PUSH_PROMISE frame when this is 0. */
    const val ENABLE_PUSH = 2

    /** Sender's maximum number of concurrent streams. */
    const val MAX_CONCURRENT_STREAMS = 3

    /** Window size in bytes. */
    const val INITIAL_WINDOW_SIZE = 4

    /** HTTP/2: Size in bytes of the largest frame payload the sender will accept. */
    const val MAX_FRAME_SIZE = 5

	if strings.Contains(buf.String(), "gorm/logger/slog.go") {
		t.Error("Found internal slog.go reference in caller frame. Expected only test file references.")
	}

	if !strings.Contains(buf.String(), "gorm/logger/slog_test.go") {
		t.Error("Missing expected test file reference. 'gorm/logger/slog_test.go' should appear in caller frames.")
	}

Blocking APIs may be inefficient because you hold a thread idle while waiting on the network. Threads are expensive because they have both a memory overhead and a context-switching overhead.

#### Framed protocols