app: harden mirroring lifecycle and state

1 files changed, 28 insertions, 1 deletions

diff --git a/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java b/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java
index 1890860..142bb34 100644
--- a/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java
+++ b/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java
@@ -16,6 +16,28 @@ public class ControlMessagesTest {
     }
 
     @Test
+    public void clipboardLimitsMatchScrcpyMessageSize() {
+        // The server caps a whole control message at MESSAGE_MAX_SIZE and
+        // derives each direction's text limit by subtracting that
+        // direction's header. Derive it the same way rather than copying
+        // the numbers, so a server bump shows up here as a failure.
+        final int messageMax = 1 << 18;                       // 256 KiB
+        assertEquals(messageMax - (1 + 8 + 1 + 4),            // SET_CLIPBOARD
+                ControlMessages.MAX_CLIPBOARD_BYTES);
+        assertEquals(messageMax - (1 + 4),                    // DeviceMessage
+                ControlMessages.MAX_DEVICE_CLIPBOARD_BYTES);
+    }
+
+    @Test
+    public void clipboardAcceptsExactlyTheLimit() {
+        char[] chars = new char[ControlMessages.MAX_CLIPBOARD_BYTES];
+        java.util.Arrays.fill(chars, 'a');   // 1 byte per char in UTF-8
+        byte[] m = ControlMessages.setClipboard(0, false, new String(chars));
+        assertEquals(14 + ControlMessages.MAX_CLIPBOARD_BYTES, m.length);
+        assertEquals(ControlMessages.MAX_CLIPBOARD_BYTES, Wire.readBe32(m, 10));
+    }
+
+    @Test
     public void touchByteLayout() {
         // ACTION_DOWN=0, single finger, target 1080x2400, x=100, y=200, full pressure
         byte[] m = ControlMessages.touch(/* action */ 0, /* pointerId */ 0L,
@@ -47,8 +69,13 @@ public class ControlMessagesTest {
     }
 
     @Test
+    public void resetVideoByteLayout() {
+        assertArrayEquals(new byte[]{17}, ControlMessages.resetVideo());
+    }
+
+    @Test
     public void setClipboardWithUtf8Payload() {
-        String text = "héllo 🎉";   // includes a 4-byte surrogate pair
+        String text = "héllo \ud83c\udf89";   // includes a 4-byte surrogate pair
         byte[] expected = text.getBytes(StandardCharsets.UTF_8);
         byte[] m = ControlMessages.setClipboard(0xdeadbeefcafeL, /* paste */ true, text);
         assertEquals(1 + 8 + 1 + 4 + expected.length, m.length);