Fix text input event segfault
The text input control_event was initially designed for mapping SDL_TextInputEvent, limited to 32 characters. For simplicity, the copy/paste feature was implemented using the same control_event: it just sends the text to paste. However, the pasted text might have a length breaking some assumptions: - on the client, the event max-size was smaller than the text max-length, - on the server, the raw buffer storing the events was smaller than the max event size. Fix these inconsistencies, and encode the length on 2 bytes, to accept more than 256 characters. Fixes <https://github.com/Genymobile/scrcpy/issues/10>.
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5 changed files with 57 additions and 15 deletions
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@ -39,9 +39,9 @@ int control_event_serialize(const struct control_event *event, unsigned char *bu
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// injecting a text takes time, so limit the text length
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len = TEXT_MAX_LENGTH;
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}
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buf[1] = (Uint8) len;
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memcpy(&buf[2], event->text_event.text, len);
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return 2 + len;
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write16(&buf[1], (Uint16) len);
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memcpy(&buf[3], event->text_event.text, len);
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return 3 + len;
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}
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case CONTROL_EVENT_TYPE_MOUSE:
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buf[1] = event->mouse_event.action;
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@ -9,8 +9,8 @@
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#include "common.h"
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#define CONTROL_EVENT_QUEUE_SIZE 64
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#define SERIALIZED_EVENT_MAX_SIZE 33
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#define TEXT_MAX_LENGTH 256
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#define TEXT_MAX_LENGTH 300
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#define SERIALIZED_EVENT_MAX_SIZE 3 + TEXT_MAX_LENGTH
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enum control_event_type {
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CONTROL_EVENT_TYPE_KEYCODE,
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@ -35,16 +35,36 @@ static void test_serialize_text_event() {
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unsigned char buf[SERIALIZED_EVENT_MAX_SIZE];
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int size = control_event_serialize(&event, buf);
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assert(size == 15);
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assert(size == 16);
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const unsigned char expected[] = {
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0x01, // CONTROL_EVENT_TYPE_KEYCODE
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0x0d, // text length
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0x00, 0x0d, // text length
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'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', // text
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};
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assert(!memcmp(buf, expected, sizeof(expected)));
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}
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static void test_serialize_long_text_event() {
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struct control_event event;
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event.type = CONTROL_EVENT_TYPE_TEXT;
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char text[TEXT_MAX_LENGTH];
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memset(text, 'a', sizeof(text));
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event.text_event.text = text;
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unsigned char buf[SERIALIZED_EVENT_MAX_SIZE];
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int size = control_event_serialize(&event, buf);
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assert(size == 3 + sizeof(text));
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unsigned char expected[3 + TEXT_MAX_LENGTH];
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expected[0] = 0x01; // CONTROL_EVENT_TYPE_KEYCODE
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expected[1] = 0x01;
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expected[2] = 0x2c; // text length (16 bits)
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memset(&expected[3], 'a', TEXT_MAX_LENGTH);
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assert(!memcmp(buf, expected, sizeof(expected)));
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}
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static void test_serialize_mouse_event() {
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struct control_event event = {
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.type = CONTROL_EVENT_TYPE_MOUSE,
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@ -114,6 +134,7 @@ static void test_serialize_scroll_event() {
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int main() {
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test_serialize_keycode_event();
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test_serialize_text_event();
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test_serialize_long_text_event();
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test_serialize_mouse_event();
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test_serialize_scroll_event();
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return 0;
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@ -13,8 +13,8 @@ public class ControlEventReader {
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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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private static final int TEXT_MAX_LENGTH = 256;
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private static final int RAW_BUFFER_SIZE = 128;
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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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@ -94,7 +94,7 @@ public class ControlEventReader {
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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.get());
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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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@ -3,14 +3,15 @@ package com.genymobile.scrcpy;
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import android.view.KeyEvent;
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import android.view.MotionEvent;
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import org.junit.Assert;
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import org.junit.Test;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.util.Arrays;
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import org.junit.Assert;
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import org.junit.Test;
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public class ControlEventReaderTest {
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@ -43,8 +44,8 @@ public class ControlEventReaderTest {
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DataOutputStream dos = new DataOutputStream(bos);
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dos.writeByte(ControlEvent.TYPE_TEXT);
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byte[] text = "testé".getBytes(StandardCharsets.UTF_8);
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dos.writeByte(text.length);
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dos.write("testé".getBytes(StandardCharsets.UTF_8));
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dos.writeShort(text.length);
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dos.write(text);
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byte[] packet = bos.toByteArray();
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reader.readFrom(new ByteArrayInputStream(packet));
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@ -54,6 +55,26 @@ public class ControlEventReaderTest {
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Assert.assertEquals("testé", event.getText());
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}
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@Test
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public void testParseLongTextEvent() throws IOException {
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ControlEventReader reader = new ControlEventReader();
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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DataOutputStream dos = new DataOutputStream(bos);
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dos.writeByte(ControlEvent.TYPE_TEXT);
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byte[] text = new byte[ControlEventReader.TEXT_MAX_LENGTH];
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Arrays.fill(text, (byte) 'a');
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dos.writeShort(text.length);
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dos.write(text);
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byte[] packet = bos.toByteArray();
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reader.readFrom(new ByteArrayInputStream(packet));
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ControlEvent event = reader.next();
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Assert.assertEquals(ControlEvent.TYPE_TEXT, event.getType());
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Assert.assertEquals(new String(text, StandardCharsets.US_ASCII), event.getText());
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}
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@Test
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public void testParseMouseEvent() throws IOException {
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ControlEventReader reader = new ControlEventReader();
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