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255 lines
8.7 KiB
Java
255 lines
8.7 KiB
Java
package com.genymobile.scrcpy;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.ByteBuffer;
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import java.nio.charset.StandardCharsets;
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public class ControlMessageReader {
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static final int INJECT_KEYCODE_PAYLOAD_LENGTH = 13;
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static final int INJECT_TOUCH_EVENT_PAYLOAD_LENGTH = 31;
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static final int INJECT_SCROLL_EVENT_PAYLOAD_LENGTH = 20;
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static final int BACK_OR_SCREEN_ON_LENGTH = 1;
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static final int SET_SCREEN_POWER_MODE_PAYLOAD_LENGTH = 1;
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static final int GET_CLIPBOARD_LENGTH = 1;
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static final int SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH = 9;
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static final int UHID_CREATE_FIXED_PAYLOAD_LENGTH = 4;
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static final int UHID_INPUT_FIXED_PAYLOAD_LENGTH = 4;
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private static final int MESSAGE_MAX_SIZE = 1 << 18; // 256k
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public static final int CLIPBOARD_TEXT_MAX_LENGTH = MESSAGE_MAX_SIZE - 14; // type: 1 byte; sequence: 8 bytes; paste flag: 1 byte; length: 4 bytes
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public static final int INJECT_TEXT_MAX_LENGTH = 300;
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private final byte[] rawBuffer = new byte[MESSAGE_MAX_SIZE];
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private final ByteBuffer buffer = ByteBuffer.wrap(rawBuffer);
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public ControlMessageReader() {
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// invariant: the buffer is always in "get" mode
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buffer.limit(0);
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}
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public boolean isFull() {
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return buffer.remaining() == rawBuffer.length;
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}
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public void readFrom(InputStream input) throws IOException {
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if (isFull()) {
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throw new IllegalStateException("Buffer full, call next() to consume");
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}
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buffer.compact();
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int head = buffer.position();
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int r = input.read(rawBuffer, head, rawBuffer.length - head);
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if (r == -1) {
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throw new EOFException("Controller socket closed");
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}
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buffer.position(head + r);
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buffer.flip();
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}
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public ControlMessage next() {
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if (!buffer.hasRemaining()) {
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return null;
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}
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int savedPosition = buffer.position();
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int type = buffer.get();
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ControlMessage msg;
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switch (type) {
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case ControlMessage.TYPE_INJECT_KEYCODE:
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msg = parseInjectKeycode();
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break;
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case ControlMessage.TYPE_INJECT_TEXT:
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msg = parseInjectText();
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break;
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case ControlMessage.TYPE_INJECT_TOUCH_EVENT:
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msg = parseInjectTouchEvent();
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break;
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case ControlMessage.TYPE_INJECT_SCROLL_EVENT:
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msg = parseInjectScrollEvent();
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break;
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case ControlMessage.TYPE_BACK_OR_SCREEN_ON:
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msg = parseBackOrScreenOnEvent();
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break;
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case ControlMessage.TYPE_GET_CLIPBOARD:
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msg = parseGetClipboard();
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break;
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case ControlMessage.TYPE_SET_CLIPBOARD:
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msg = parseSetClipboard();
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break;
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case ControlMessage.TYPE_SET_SCREEN_POWER_MODE:
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msg = parseSetScreenPowerMode();
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break;
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case ControlMessage.TYPE_EXPAND_NOTIFICATION_PANEL:
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case ControlMessage.TYPE_EXPAND_SETTINGS_PANEL:
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case ControlMessage.TYPE_COLLAPSE_PANELS:
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case ControlMessage.TYPE_ROTATE_DEVICE:
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msg = ControlMessage.createEmpty(type);
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break;
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case ControlMessage.TYPE_UHID_CREATE:
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msg = parseUhidCreate();
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break;
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case ControlMessage.TYPE_UHID_INPUT:
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msg = parseUhidInput();
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break;
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default:
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Ln.w("Unknown event type: " + type);
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msg = null;
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break;
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}
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if (msg == null) {
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// failure, reset savedPosition
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buffer.position(savedPosition);
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}
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return msg;
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}
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private ControlMessage parseInjectKeycode() {
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if (buffer.remaining() < INJECT_KEYCODE_PAYLOAD_LENGTH) {
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return null;
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}
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int action = Binary.toUnsigned(buffer.get());
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int keycode = buffer.getInt();
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int repeat = buffer.getInt();
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int metaState = buffer.getInt();
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return ControlMessage.createInjectKeycode(action, keycode, repeat, metaState);
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}
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private int parseBufferLength(int sizeBytes) {
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assert sizeBytes > 0 && sizeBytes <= 4;
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if (buffer.remaining() < sizeBytes) {
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return -1;
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}
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int value = 0;
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for (int i = 0; i < sizeBytes; ++i) {
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value = (value << 8) | (buffer.get() & 0xFF);
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}
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return value;
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}
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private String parseString() {
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int len = parseBufferLength(4);
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if (len == -1 || buffer.remaining() < len) {
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return null;
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}
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int position = buffer.position();
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// Move the buffer position to consume the text
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buffer.position(position + len);
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return new String(rawBuffer, position, len, StandardCharsets.UTF_8);
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}
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private byte[] parseByteArray(int sizeBytes) {
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int len = parseBufferLength(sizeBytes);
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if (len == -1 || buffer.remaining() < len) {
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return null;
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}
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byte[] data = new byte[len];
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buffer.get(data);
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return data;
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}
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private ControlMessage parseInjectText() {
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String text = parseString();
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if (text == null) {
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return null;
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}
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return ControlMessage.createInjectText(text);
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}
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private ControlMessage parseInjectTouchEvent() {
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if (buffer.remaining() < INJECT_TOUCH_EVENT_PAYLOAD_LENGTH) {
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return null;
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}
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int action = Binary.toUnsigned(buffer.get());
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long pointerId = buffer.getLong();
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Position position = readPosition(buffer);
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float pressure = Binary.u16FixedPointToFloat(buffer.getShort());
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int actionButton = buffer.getInt();
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int buttons = buffer.getInt();
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return ControlMessage.createInjectTouchEvent(action, pointerId, position, pressure, actionButton, buttons);
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}
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private ControlMessage parseInjectScrollEvent() {
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if (buffer.remaining() < INJECT_SCROLL_EVENT_PAYLOAD_LENGTH) {
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return null;
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}
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Position position = readPosition(buffer);
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float hScroll = Binary.i16FixedPointToFloat(buffer.getShort());
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float vScroll = Binary.i16FixedPointToFloat(buffer.getShort());
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int buttons = buffer.getInt();
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return ControlMessage.createInjectScrollEvent(position, hScroll, vScroll, buttons);
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}
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private ControlMessage parseBackOrScreenOnEvent() {
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if (buffer.remaining() < BACK_OR_SCREEN_ON_LENGTH) {
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return null;
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}
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int action = Binary.toUnsigned(buffer.get());
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return ControlMessage.createBackOrScreenOn(action);
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}
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private ControlMessage parseGetClipboard() {
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if (buffer.remaining() < GET_CLIPBOARD_LENGTH) {
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return null;
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}
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int copyKey = Binary.toUnsigned(buffer.get());
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return ControlMessage.createGetClipboard(copyKey);
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}
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private ControlMessage parseSetClipboard() {
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if (buffer.remaining() < SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH) {
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return null;
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}
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long sequence = buffer.getLong();
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boolean paste = buffer.get() != 0;
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String text = parseString();
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if (text == null) {
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return null;
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}
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return ControlMessage.createSetClipboard(sequence, text, paste);
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}
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private ControlMessage parseSetScreenPowerMode() {
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if (buffer.remaining() < SET_SCREEN_POWER_MODE_PAYLOAD_LENGTH) {
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return null;
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}
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int mode = buffer.get();
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return ControlMessage.createSetScreenPowerMode(mode);
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}
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private ControlMessage parseUhidCreate() {
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if (buffer.remaining() < UHID_CREATE_FIXED_PAYLOAD_LENGTH) {
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return null;
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}
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int id = buffer.getShort();
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byte[] data = parseByteArray(2);
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if (data == null) {
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return null;
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}
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return ControlMessage.createUhidCreate(id, data);
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}
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private ControlMessage parseUhidInput() {
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if (buffer.remaining() < UHID_INPUT_FIXED_PAYLOAD_LENGTH) {
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return null;
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}
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int id = buffer.getShort();
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byte[] data = parseByteArray(2);
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if (data == null) {
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return null;
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}
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return ControlMessage.createUhidInput(id, data);
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}
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private static Position readPosition(ByteBuffer buffer) {
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int x = buffer.getInt();
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int y = buffer.getInt();
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int screenWidth = Binary.toUnsigned(buffer.getShort());
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int screenHeight = Binary.toUnsigned(buffer.getShort());
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return new Position(x, y, screenWidth, screenHeight);
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}
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}
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