/**
 * Classifies stack frames by their {@link StackTraceRelevance relevance}.
 * <p>
 * Classifiers are meant to be heuristic, determining the relevance on the best-effort basis.
 */
public interface StackTraceClassifier {

    StackTraceClassifier USER_CODE = new StackTraceClassifier() {
        @Override
        public StackTraceRelevance classify(StackTraceElement frame) {
            return StackTraceRelevance.USER_CODE;

     *
     * @see Throwable#toString()
     */
    String getHeader();

    /**
     * Stack frames from the original exception.
     */
    List<StackTraceElement> getStackTrace();

    /**
     * Relevance of a given stack frame in the {@link #getStackTrace() stack trace}.
     */
    StackTraceRelevance getStackTraceRelevance(int frameIndex);

    /**

import okio.ByteString
import okio.Source
import okio.Timeout

/**
 * Reads HTTP/2 transport frames.
 *
 * This implementation assumes we do not send an increased [frame][Settings.getMaxFrameSize] to the
 * peer. Hence, we expect all frames to have a max length of [Http2.INITIAL_MAX_FRAME_SIZE].
 */
class Http2Reader(
  /** Creates a frame reader with max header table size of 4096. */
  private val source: BufferedSource,

  ): Boolean {
    // Don't send new frames after we've failed or enqueued a close frame.
    if (failed || enqueuedClose) return false

    // If this frame overflows the buffer, reject it and close the web socket.
    if (queueSize + data.size > MAX_QUEUE_SIZE) {
      close(CLOSE_CLIENT_GOING_AWAY, null)
      return false
    }

    // Enqueue the message frame.
    queueSize += data.size.toLong()

				lastAddr = addr
			} else if (addr-lastAddr <= neighborhood) && lastFrames != nil {
				frames = lastFrames
			}

			sp.addStack(addr, frames)
		}
	}
}

func (sp *sourcePrinter) addStack(addr uint64, frames []plugin.Frame) {
	// See if the stack contains a function we are interested in.
	for i, f := range frames {
		if !sp.interest[f.Func] {
			continue
		}

  }

  /** Maximum length of an outbound data frame.  */
  fun maxOutboundDataLength(): Int = writer.maxDataLength()

  /** Count of frames sent or received.  */
  fun frameCount(): Int = frameCount

  fun sendFrame(): Http2Writer {
    outFrames.add(OutFrame(frameCount++, bytesOut.size, false))
    return writer
  }

  /**
   * Shortens the last frame from its original length to `length`. This will cause the peer to

	// and implies that each frame's disposal method is 0 (no disposal
	// specified).
	Disposal []byte
	// Config is the global color table (palette), width and height. A nil or
	// empty-color.Palette Config.ColorModel means that each frame has its own
	// color table and there is no global color table. Each frame's bounds must
	// be within the rectangle defined by the two points (0, 0) and

			filtered.Events = append(filtered.Events, e)
		}
	}
	return
}

func stackFrames(data *format.Data, stackID int) (frames []string) {
	for {
		frame, ok := data.Frames[strconv.Itoa(stackID)]
		if !ok {
			return
		}
		frames = append(frames, frame.Name)
		stackID = frame.Parent
	}
}

func checkProcStartStop(t *testing.T, data format.Data) {
	procStarted := map[uint64]bool{}

	byteorder.LePutUint16(e.buf[7:9], uint16(b.Dy()))
	e.write(e.buf[:9])

	// To determine whether or not this frame's palette is the same as the
	// global palette, we can check a couple things. First, do they actually
	// point to the same []color.Color? If so, they are equal so long as the
	// frame's palette is not longer than the global palette...
	paddedSize := log2(len(pm.Palette)) // Size of Local Color Table: 2^(1+n).

			return false
		}
	}
	return true
}

var frames = []string{
	"../testdata/video-001.gif",
	"../testdata/video-005.gray.gif",
}

func testEncodeAll(t *testing.T, go1Dot5Fields bool, useGlobalColorModel bool) {
	const width, height = 150, 103

	g0 := &GIF{
		Image:     make([]*image.Paletted, len(frames)),
		Delay:     make([]int, len(frames)),
		LoopCount: 5,
	}
	for i, f := range frames {