Method readSettingsFrame

java/org/apache/coyote/http2/Http2Parser.java:338–368

(int flags, int payloadSize, ByteBuffer buffer)

    protected void readSettingsFrame(int flags, int payloadSize, ByteBuffer buffer) throws Http2Exception, IOException {
        boolean ack = Flags.isAck(flags);
        if (payloadSize > 0 && ack) {
            throw new ConnectionException(sm.getString("http2Parser.processFrameSettings.ackWithNonZeroPayload"),
                    Http2Error.FRAME_SIZE_ERROR);
        }

        if (payloadSize == 0 && !ack) {
            // Ensure empty SETTINGS frame increments the overhead count
            output.setting(null, 0);
        } else {
            // Process the settings
            byte[] setting = new byte[6];
            for (int i = 0; i < payloadSize / 6; i++) {
                if (buffer == null) {
                    input.fill(true, setting);
                } else {
                    buffer.get(setting);
                }
                int id = ByteUtil.getTwoBytes(setting, 0);
                long value = ByteUtil.getFourBytes(setting, 2);
                Setting key = Setting.valueOf(id);
                if (key == Setting.UNKNOWN) {
                    log.warn(sm.getString("connectionSettings.unknown", connectionId, Integer.toString(id),
                            Long.toString(value)));
                }
                output.setting(key, value);
            }
        }
        output.settingsEnd(ack);
    }


    /**