mirror of https://github.com/Genymobile/scrcpy
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152 lines
4.9 KiB
Java
152 lines
4.9 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 ControlEventReader {
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private static final int KEYCODE_PAYLOAD_LENGTH = 9;
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private static final int MOUSE_PAYLOAD_LENGTH = 13;
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private static final int SCROLL_PAYLOAD_LENGTH = 16;
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private static final int COMMAND_PAYLOAD_LENGTH = 1;
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public static final int TEXT_MAX_LENGTH = 300;
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private static final int RAW_BUFFER_SIZE = 1024;
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private final byte[] rawBuffer = new byte[RAW_BUFFER_SIZE];
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private final ByteBuffer buffer = ByteBuffer.wrap(rawBuffer);
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private final byte[] textBuffer = new byte[TEXT_MAX_LENGTH];
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public ControlEventReader() {
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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("Event 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 ControlEvent 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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ControlEvent controlEvent;
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switch (type) {
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case ControlEvent.TYPE_KEYCODE:
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controlEvent = parseKeycodeControlEvent();
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break;
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case ControlEvent.TYPE_TEXT:
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controlEvent = parseTextControlEvent();
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break;
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case ControlEvent.TYPE_MOUSE:
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controlEvent = parseMouseControlEvent();
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break;
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case ControlEvent.TYPE_SCROLL:
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controlEvent = parseScrollControlEvent();
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break;
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case ControlEvent.TYPE_COMMAND:
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controlEvent = parseCommandControlEvent();
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break;
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default:
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Ln.w("Unknown event type: " + type);
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controlEvent = null;
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break;
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}
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if (controlEvent == null) {
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// failure, reset savedPosition
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buffer.position(savedPosition);
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}
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return controlEvent;
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}
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private ControlEvent parseKeycodeControlEvent() {
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if (buffer.remaining() < KEYCODE_PAYLOAD_LENGTH) {
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return null;
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}
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int action = toUnsigned(buffer.get());
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int keycode = buffer.getInt();
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int metaState = buffer.getInt();
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return ControlEvent.createKeycodeControlEvent(action, keycode, metaState);
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}
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private ControlEvent parseTextControlEvent() {
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if (buffer.remaining() < 1) {
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return null;
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}
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int len = toUnsigned(buffer.getShort());
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if (buffer.remaining() < len) {
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return null;
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}
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buffer.get(textBuffer, 0, len);
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String text = new String(textBuffer, 0, len, StandardCharsets.UTF_8);
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return ControlEvent.createTextControlEvent(text);
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}
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private ControlEvent parseMouseControlEvent() {
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if (buffer.remaining() < MOUSE_PAYLOAD_LENGTH) {
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return null;
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}
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int action = toUnsigned(buffer.get());
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int buttons = buffer.getInt();
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Position position = readPosition(buffer);
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return ControlEvent.createMotionControlEvent(action, buttons, position);
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}
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private ControlEvent parseScrollControlEvent() {
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if (buffer.remaining() < SCROLL_PAYLOAD_LENGTH) {
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return null;
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}
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Position position = readPosition(buffer);
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int hScroll = buffer.getInt();
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int vScroll = buffer.getInt();
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return ControlEvent.createScrollControlEvent(position, hScroll, vScroll);
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}
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private ControlEvent parseCommandControlEvent() {
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if (buffer.remaining() < COMMAND_PAYLOAD_LENGTH) {
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return null;
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}
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int action = toUnsigned(buffer.get());
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return ControlEvent.createCommandControlEvent(action);
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}
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private static Position readPosition(ByteBuffer buffer) {
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int x = toUnsigned(buffer.getShort());
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int y = toUnsigned(buffer.getShort());
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int screenWidth = toUnsigned(buffer.getShort());
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int screenHeight = toUnsigned(buffer.getShort());
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return new Position(x, y, screenWidth, screenHeight);
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}
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@SuppressWarnings("checkstyle:MagicNumber")
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private static int toUnsigned(short value) {
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return value & 0xffff;
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}
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@SuppressWarnings("checkstyle:MagicNumber")
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private static int toUnsigned(byte value) {
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return value & 0xff;
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}
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}
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