Forward Alt to the device

There is no reason not to forward it.

.gitignore

@@ -1,8 +1,5 @@
 build/
 /dist/
-/build-*/
-/build_*/
-/release-*/
 .idea/
 .gradle/
 /x/

README.md

@@ -354,7 +354,7 @@ scrcpy --fullscreen
 scrcpy -f  # short version
 ```
 
-Fullscreen can then be toggled dynamically with `RCtrl`+`f`.
+Fullscreen can then be toggled dynamically with `Ctrl`+`f`.
 
 #### Rotation
 
@@ -370,18 +370,18 @@ Possibles values are:
  - `2`: 180 degrees
  - `3`: 90 degrees clockwise
 
-The rotation can also be changed dynamically with `RCtrl`+`←` _(left)_ and
-`RCtrl`+`→` _(right)_.
+The rotation can also be changed dynamically with `Ctrl`+`←` _(left)_ and
+`Ctrl`+`→` _(right)_.
 
 Note that _scrcpy_ manages 3 different rotations:
- - `RCtrl`+`r` requests the device to switch between portrait and landscape (the
+ - `Ctrl`+`r` requests the device to switch between portrait and landscape (the
    current running app may refuse, if it does support the requested
    orientation).
  - `--lock-video-orientation` changes the mirroring orientation (the orientation
    of the video sent from the device to the computer). This affects the
    recording.
- - `--rotation` (or `RCtrl`+`←`/`RCtrl`+`→`) rotates only the window content.
-   This affects only the display, not the recording.
+ - `--rotation` (or `Ctrl`+`←`/`Ctrl`+`→`) rotates only the window content. This
+   affects only the display, not the recording.
 
 
 ### Other mirroring options
@@ -437,9 +437,9 @@ scrcpy --turn-screen-off
 scrcpy -S
 ```
 
-Or by pressing `RCtrl`+`o` at any time.
+Or by pressing `Ctrl`+`o` at any time.
 
-To turn it back on, press `RCtrl`+`Shift`+`o` (or `POWER`, `RCtrl`+`p`).
+To turn it back on, press `Ctrl`+`Shift`+`o` (or `POWER`, `Ctrl`+`p`).
 
 It can be useful to also prevent the device to sleep:
 
@@ -483,22 +483,24 @@ Note that it only shows _physical_ touches (with the finger on the device).
 
 #### Rotate device screen
 
-Press `RCtrl`+`r` to switch between portrait and landscape modes.
+Press `Ctrl`+`r` to switch between portrait and landscape modes.
 
 Note that it rotates only if the application in foreground supports the
 requested orientation.
 
 #### Copy-paste
 
-Any time the Android clipboard changes, it is automatically synchronized to the
-computer clipboard.
+It is possible to synchronize clipboards between the computer and the device, in
+both directions:
 
-`Ctrl`+`c` (copy), `Ctrl`+`x` (cut) and `LCtrl`+`v` (paste) work as you expect.
-
-In addition, `RCtrl`+`v` allows to inject the computer clipboard content as a
-sequence of text event. Even if it can break non-ASCII content, this is
-sometimes necessary when pasting directly is not possible.
+ - `Ctrl`+`c` copies the device clipboard to the computer clipboard;
+ - `Ctrl`+`Shift`+`v` copies the computer clipboard to the device clipboard (and
+   pastes if the device runs Android >= 7);
+ - `Ctrl`+`v` _pastes_ the computer clipboard as a sequence of text events (but
+   breaks non-ASCII characters).
 
+Moreover, any time the Android clipboard changes, it is automatically
+synchronized to the computer clipboard.
 
 #### Text injection preference
 
@@ -558,34 +560,33 @@ Also see [issue #14].
 
 ## Shortcuts
 
-`RCtrl` is the right `Ctrl` key (the left `Ctrl` key is forwarded to the
+`LCtrl` is the left `Ctrl` key (the right `Ctrl` key is forwarded to the
 device).
 
-On macOS, `Cmd` also works (for shortcuts which are not already captured by the
-system).
-
- | Action                                      |   Shortcut
- | ------------------------------------------- |:-----------------------------
- | Switch fullscreen mode                      | `RCtrl`+`f`
- | Rotate display left                         | `RCtrl`+`←`
- | Rotate display right                        | `RCtrl`+`→`
- | Resize window to 1:1 (pixel-perfect)        | `RCtrl`+`g`
- | Resize window to remove black borders       | `RCtrl`+`w` \| _Double-click¹_
- | Click on `HOME`                             | `RCtrl`+`h` \| _Middle-click_
- | Click on `BACK`                             | `RCtrl`+`b` \| _Right-click²_
- | Click on `APP_SWITCH`                       | `RCtrl`+`s`
- | Click on `MENU`                             | `RCtrl`+`m`
- | Click on `VOLUME_UP`                        | `RCtrl`+`↑` _(up)_
- | Click on `VOLUME_DOWN`                      | `RCtrl`+`↓` _(down)_
- | Click on `POWER`                            | `RCtrl`+`p`
- | Power on                                    | _Right-click²_
- | Turn device screen off (keep mirroring)     | `RCtrl`+`o`
- | Turn device screen on                       | `RCtrl`+`Shift`+`o`
- | Rotate device screen                        | `RCtrl`+`r`
- | Expand notification panel                   | `RCtrl`+`n`
- | Collapse notification panel                 | `RCtrl`+`Shift`+`n`
- | Inject computer clipboard text              | `RCtrl`+`v`
- | Enable/disable FPS counter (on stdout)      | `RCtrl`+`i`
+ | Action                                      |   Shortcut                    |   Shortcut (macOS)
+ | ------------------------------------------- |:----------------------------- |:-----------------------------
+ | Switch fullscreen mode                      | `LCtrl`+`f`                    | `Cmd`+`f`
+ | Rotate display left                         | `LCtrl`+`←` _(left)_           | `Cmd`+`←` _(left)_
+ | Rotate display right                        | `LCtrl`+`→` _(right)_          | `Cmd`+`→` _(right)_
+ | Resize window to 1:1 (pixel-perfect)        | `LCtrl`+`g`                    | `Cmd`+`g`
+ | Resize window to remove black borders       | `LCtrl`+`x` \| _Double-click¹_ | `Cmd`+`x`  \| _Double-click¹_
+ | Click on `HOME`                             | `LCtrl`+`h` \| _Middle-click_  | `Ctrl`+`h` \| _Middle-click_
+ | Click on `BACK`                             | `LCtrl`+`b` \| _Right-click²_  | `Cmd`+`b`  \| _Right-click²_
+ | Click on `APP_SWITCH`                       | `LCtrl`+`s`                    | `Cmd`+`s`
+ | Click on `MENU`                             | `LCtrl`+`m`                    | `Ctrl`+`m`
+ | Click on `VOLUME_UP`                        | `LCtrl`+`↑` _(up)_             | `Cmd`+`↑` _(up)_
+ | Click on `VOLUME_DOWN`                      | `LCtrl`+`↓` _(down)_           | `Cmd`+`↓` _(down)_
+ | Click on `POWER`                            | `LCtrl`+`p`                    | `Cmd`+`p`
+ | Power on                                    | _Right-click²_                 | _Right-click²_
+ | Turn device screen off (keep mirroring)     | `LCtrl`+`o`                    | `Cmd`+`o`
+ | Turn device screen on                       | `LCtrl`+`Shift`+`o`            | `Cmd`+`Shift`+`o`
+ | Rotate device screen                        | `LCtrl`+`r`                    | `Cmd`+`r`
+ | Expand notification panel                   | `LCtrl`+`n`                    | `Cmd`+`n`
+ | Collapse notification panel                 | `LCtrl`+`Shift`+`n`            | `Cmd`+`Shift`+`n`
+ | Copy device clipboard to computer           | `LCtrl`+`c`                    | `Cmd`+`c`
+ | Paste computer clipboard to device          | `LCtrl`+`v`                    | `Cmd`+`v`
+ | Copy computer clipboard to device and paste | `LCtrl`+`Shift`+`v`            | `Cmd`+`Shift`+`v`
+ | Enable/disable FPS counter (on stdout)      | `LCtrl`+`i`                    | `Cmd`+`i`
 
 _¹Double-click on black borders to remove them._  
 _²Right-click turns the screen on if it was off, presses BACK otherwise._

app/meson.build

@@ -164,12 +164,12 @@ if get_option('buildtype') == 'debug'
             'src/cli.c',
             'src/util/str_util.c',
         ]],
-        ['test_control_msg_serialize', [
+        ['test_control_event_serialize', [
             'tests/test_control_msg_serialize.c',
             'src/control_msg.c',
             'src/util/str_util.c',
         ]],
-        ['test_device_msg_deserialize', [
+        ['test_device_event_deserialize', [
             'tests/test_device_msg_deserialize.c',
             'src/device_msg.c',
         ]],

app/scrcpy.1

@@ -203,54 +203,54 @@ Default is 0 (automatic).\n
 
 .SH SHORTCUTS
 
-RCtrl is the right Ctrl key (the left Ctrl key is forwarded to the device).
+\fBLCtrl\fR is the left Ctrl key (the right Ctrl key is forwarded to the device).
 
 .TP
-.B RCtrl+f
+.B LCtrl+f
 Switch fullscreen mode
 
 .TP
-.B RCtrl+Left
+.B LCtrl+Left
 Rotate display left
 
 .TP
-.B RCtrl+Right
+.B LCtrl+Right
 Rotate display right
 
 .TP
-.B RCtrl+g
+.B LCtrl+g
 Resize window to 1:1 (pixel\-perfect)
 
 .TP
-.B RCtrl+w, Double\-click on black borders
+.B LCtrl+x, Double\-click on black borders
 Resize window to remove black borders
 
 .TP
-.B RCtrl+h, Home, Middle\-click
+.B LCtrl+h, Home, Middle\-click
 Click on HOME
 
 .TP
-.B RCtrl+b, RCtrl+Backspace, Right\-click (when screen is on)
+.B LCtrl+b, Ctrl+Backspace, Right\-click (when screen is on)
 Click on BACK
 
 .TP
-.B RCtrl+s
+.B LCtrl+s
 Click on APP_SWITCH
 
 .TP
-.B RCtrl+m
+.B LCtrl+m
 Click on MENU
 
 .TP
-.B RCtrl+Up
+.B LCtrl+Up
 Click on VOLUME_UP
 
 .TP
-.B RCtrl+Down
+.B LCtrl+Down
 Click on VOLUME_DOWN
 
 .TP
-.B RCtrl+p
+.B LCtrl+p
 Click on POWER (turn screen on/off)
 
 .TP
@@ -258,31 +258,39 @@ Click on POWER (turn screen on/off)
 Turn screen on
 
 .TP
-.B RCtrl+o
+.B LCtrl+o
 Turn device screen off (keep mirroring)
 
 .TP
-.B RCtrl+Shift+o
+.B LCtrl+Shift+o
 Turn device screen on
 
 .TP
-.B RCtrl+r
+.B LCtrl+r
 Rotate device screen
 
 .TP
-.B RCtrl+n
+.B LCtrl+n
 Expand notification panel
 
 .TP
-.B RCtrl+Shift+n
+.B LCtrl+Shift+n
 Collapse notification panel
 
 .TP
-.B RCtrl+v
-Inject computer clipboard text
+.B LCtrl+c
+Copy device clipboard to computer
 
 .TP
-.B RCtrl+i
+.B LCtrl+v
+Paste computer clipboard to device
+
+.TP
+.B LCtrl+Shift+v
+Copy computer clipboard to device (and paste if the device runs Android >= 7)
+
+.TP
+.B LCtrl+i
 Enable/disable FPS counter (print frames/second in logs)
 
 .TP

app/src/cli.c

@@ -12,6 +12,11 @@
 
 void
 scrcpy_print_usage(const char *arg0) {
+#ifdef __APPLE__
+# define CTRL_OR_CMD "Cmd"
+#else
+# define CTRL_OR_CMD "LCtrl"
+#endif
     fprintf(stderr,
         "Usage: %s [options]\n"
         "\n"
@@ -181,71 +186,78 @@ scrcpy_print_usage(const char *arg0) {
         "\n"
         "Shortcuts:\n"
         "\n"
-        "    RCtrl is the right Ctrl key (the left Ctrl key is forwarded to\n"
-        "    the device.\n"
+        "    LCtrl is the left Ctrl key (the right Ctrl key is forwarded to\n"
+        "    the device).\n"
         "\n"
-        "    RCtrl+f\n"
+        "    " CTRL_OR_CMD "+f\n"
         "        Switch fullscreen mode\n"
         "\n"
-        "    RCtrl+Left\n"
+        "    " CTRL_OR_CMD "+Left\n"
         "        Rotate display left\n"
         "\n"
-        "    RCtrl+Right\n"
+        "    " CTRL_OR_CMD "+Right\n"
         "        Rotate display right\n"
         "\n"
-        "    RCtrl+g\n"
+        "    " CTRL_OR_CMD "+g\n"
         "        Resize window to 1:1 (pixel-perfect)\n"
         "\n"
-        "    RCtrl+w\n"
+        "    " CTRL_OR_CMD "+x\n"
         "    Double-click on black borders\n"
         "        Resize window to remove black borders\n"
         "\n"
-        "    RCtrl+h\n"
+        "    LCtrl+h\n"
         "    Middle-click\n"
         "        Click on HOME\n"
         "\n"
-        "    RCtrl+b\n"
-        "    RCtrl+Backspace\n"
+        "    " CTRL_OR_CMD "+b\n"
+        "    " CTRL_OR_CMD "+Backspace\n"
         "    Right-click (when screen is on)\n"
         "        Click on BACK\n"
         "\n"
-        "    RCtrl+s\n"
+        "    " CTRL_OR_CMD "+s\n"
         "        Click on APP_SWITCH\n"
         "\n"
-        "    RCtrl+m\n"
+        "    LCtrl+m\n"
         "        Click on MENU\n"
         "\n"
-        "    RCtrl+Up\n"
+        "    " CTRL_OR_CMD "+Up\n"
         "        Click on VOLUME_UP\n"
         "\n"
-        "    RCtrl+Down\n"
+        "    " CTRL_OR_CMD "+Down\n"
         "        Click on VOLUME_DOWN\n"
         "\n"
-        "    RCtrl+p\n"
+        "    " CTRL_OR_CMD "+p\n"
         "        Click on POWER (turn screen on/off)\n"
         "\n"
         "    Right-click (when screen is off)\n"
         "        Power on\n"
         "\n"
-        "    RCtrl+o\n"
+        "    " CTRL_OR_CMD "+o\n"
         "        Turn device screen off (keep mirroring)\n"
         "\n"
-        "    RCtrl+Shift+o\n"
+        "    " CTRL_OR_CMD "+Shift+o\n"
         "        Turn device screen on\n"
         "\n"
-        "    RCtrl+r\n"
+        "    " CTRL_OR_CMD "+r\n"
         "        Rotate device screen\n"
         "\n"
-        "    RCtrl+n\n"
+        "    " CTRL_OR_CMD "+n\n"
         "        Expand notification panel\n"
         "\n"
-        "    RCtrl+Shift+n\n"
+        "    " CTRL_OR_CMD "+Shift+n\n"
         "        Collapse notification panel\n"
         "\n"
-        "    RCtrl+v\n"
-        "        Inject computer clipboard text\n"
+        "    " CTRL_OR_CMD "+c\n"
+        "        Copy device clipboard to computer\n"
         "\n"
-        "    RCtrl+i\n"
+        "    " CTRL_OR_CMD "+v\n"
+        "        Paste computer clipboard to device\n"
+        "\n"
+        "    " CTRL_OR_CMD "+Shift+v\n"
+        "        Copy computer clipboard to device (and paste if the device\n"
+        "        runs Android >= 7)\n"
+        "\n"
+        "    " CTRL_OR_CMD "+i\n"
         "        Enable/disable FPS counter (print frames/second in logs)\n"
         "\n"
         "    Drag & drop APK file\n"

app/src/control_msg.c

@@ -20,9 +20,9 @@ write_position(uint8_t *buf, const struct position *position) {
 static size_t
 write_string(const char *utf8, size_t max_len, unsigned char *buf) {
     size_t len = utf8_truncation_index(utf8, max_len);
-    buffer_write32be(buf, len);
-    memcpy(&buf[4], utf8, len);
-    return 4 + len;
+    buffer_write16be(buf, (uint16_t) len);
+    memcpy(&buf[2], utf8, len);
+    return 2 + len;
 }
 
 static uint16_t
@@ -67,10 +67,11 @@ control_msg_serialize(const struct control_msg *msg, unsigned char *buf) {
                              (uint32_t) msg->inject_scroll_event.vscroll);
             return 21;
         case CONTROL_MSG_TYPE_SET_CLIPBOARD: {
+            buf[1] = !!msg->set_clipboard.paste;
             size_t len = write_string(msg->set_clipboard.text,
                                       CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH,
-                                      &buf[1]);
-            return 1 + len;
+                                      &buf[2]);
+            return 2 + len;
         }
         case CONTROL_MSG_TYPE_SET_SCREEN_POWER_MODE:
             buf[1] = msg->set_screen_power_mode.mode;

app/src/control_msg.h

@@ -10,11 +10,10 @@
 #include "android/keycodes.h"
 #include "common.h"
 
-#define CONTROL_MSG_MAX_SIZE (1 << 18) // 256k
-
 #define CONTROL_MSG_INJECT_TEXT_MAX_LENGTH 300
-// type: 1 byte; length: 4 bytes
-#define CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH (CONTROL_MSG_MAX_SIZE - 5)
+#define CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH 4092
+#define CONTROL_MSG_SERIALIZED_MAX_SIZE \
+    (4 + CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH)
 
 #define POINTER_ID_MOUSE UINT64_C(-1);
 
@@ -63,6 +62,7 @@ struct control_msg {
         } inject_scroll_event;
         struct {
             char *text; // owned, to be freed by SDL_free()
+            bool paste;
         } set_clipboard;
         struct {
             enum screen_power_mode mode;
@@ -70,7 +70,7 @@ struct control_msg {
     };
 };
 
-// buf size must be at least CONTROL_MSG_MAX_SIZE
+// buf size must be at least CONTROL_MSG_SERIALIZED_MAX_SIZE
 // return the number of bytes written
 size_t
 control_msg_serialize(const struct control_msg *msg, unsigned char *buf);

app/src/controller.c

@@ -60,7 +60,7 @@ controller_push_msg(struct controller *controller,
 static bool
 process_msg(struct controller *controller,
               const struct control_msg *msg) {
-    static unsigned char serialized_msg[CONTROL_MSG_MAX_SIZE];
+    unsigned char serialized_msg[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int length = control_msg_serialize(msg, serialized_msg);
     if (!length) {
         return false;

app/src/device_msg.c

@@ -9,7 +9,7 @@
 ssize_t
 device_msg_deserialize(const unsigned char *buf, size_t len,
                        struct device_msg *msg) {
-    if (len < 5) {
+    if (len < 3) {
         // at least type + empty string length
         return 0; // not available
     }
@@ -17,8 +17,8 @@ device_msg_deserialize(const unsigned char *buf, size_t len,
     msg->type = buf[0];
     switch (msg->type) {
         case DEVICE_MSG_TYPE_CLIPBOARD: {
-            size_t clipboard_len = buffer_read32be(&buf[1]);
-            if (clipboard_len > len - 5) {
+            uint16_t clipboard_len = buffer_read16be(&buf[1]);
+            if (clipboard_len > len - 3) {
                 return 0; // not available
             }
             char *text = SDL_malloc(clipboard_len + 1);
@@ -27,12 +27,12 @@ device_msg_deserialize(const unsigned char *buf, size_t len,
                 return -1;
             }
             if (clipboard_len) {
-                memcpy(text, &buf[5], clipboard_len);
+                memcpy(text, &buf[3], clipboard_len);
             }
             text[clipboard_len] = '\0';
 
             msg->clipboard.text = text;
-            return 5 + clipboard_len;
+            return 3 + clipboard_len;
         }
         default:
             LOGW("Unknown device message type: %d", (int) msg->type);

app/src/device_msg.h

@@ -7,9 +7,8 @@
 
 #include "config.h"
 
-#define DEVICE_MSG_MAX_SIZE (1 << 18) // 256k
-// type: 1 byte; length: 4 bytes
-#define DEVICE_MSG_TEXT_MAX_LENGTH (DEVICE_MSG_MAX_SIZE - 5)
+#define DEVICE_MSG_TEXT_MAX_LENGTH 4093
+#define DEVICE_MSG_SERIALIZED_MAX_SIZE (3 + DEVICE_MSG_TEXT_MAX_LENGTH)
 
 enum device_msg_type {
     DEVICE_MSG_TYPE_CLIPBOARD,

app/src/event_converter.c

@@ -92,9 +92,11 @@ convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod,
         MAP(SDLK_LEFT,         AKEYCODE_DPAD_LEFT);
         MAP(SDLK_DOWN,         AKEYCODE_DPAD_DOWN);
         MAP(SDLK_UP,           AKEYCODE_DPAD_UP);
-        MAP(SDLK_LCTRL,        AKEYCODE_CTRL_LEFT);
+        MAP(SDLK_RCTRL,        AKEYCODE_CTRL_RIGHT);
         MAP(SDLK_LSHIFT,       AKEYCODE_SHIFT_LEFT);
         MAP(SDLK_RSHIFT,       AKEYCODE_SHIFT_RIGHT);
+        MAP(SDLK_LALT,         AKEYCODE_ALT_LEFT);
+        MAP(SDLK_RALT,         AKEYCODE_ALT_RIGHT);
     }
 
     if (!(mod & (KMOD_NUM | KMOD_SHIFT))) {
@@ -114,7 +116,7 @@ convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod,
         }
     }
 
-    if (prefer_text && !(mod & KMOD_LCTRL)) {
+    if (prefer_text) {
         // do not forward alpha and space key events
         return false;
     }

app/src/input_manager.c

@@ -102,7 +102,17 @@ collapse_notification_panel(struct controller *controller) {
 }
 
 static void
-set_device_clipboard(struct controller *controller) {
+request_device_clipboard(struct controller *controller) {
+    struct control_msg msg;
+    msg.type = CONTROL_MSG_TYPE_GET_CLIPBOARD;
+
+    if (!controller_push_msg(controller, &msg)) {
+        LOGW("Could not request device clipboard");
+    }
+}
+
+static void
+set_device_clipboard(struct controller *controller, bool paste) {
     char *text = SDL_GetClipboardText();
     if (!text) {
         LOGW("Could not get clipboard text: %s", SDL_GetError());
@@ -117,6 +127,7 @@ set_device_clipboard(struct controller *controller) {
     struct control_msg msg;
     msg.type = CONTROL_MSG_TYPE_SET_CLIPBOARD;
     msg.set_clipboard.text = text;
+    msg.set_clipboard.paste = paste;
 
     if (!controller_push_msg(controller, &msg)) {
         SDL_free(text);
@@ -241,25 +252,6 @@ convert_input_key(const SDL_KeyboardEvent *from, struct control_msg *to,
     return true;
 }
 
-static void
-inject_as_ctrl(struct input_manager *im, const SDL_KeyboardEvent *event) {
-    struct control_msg msg;
-
-    if (!convert_input_key(event, &msg, false)) {
-        return;
-    }
-
-    // Disable RCtrl and Meta
-    msg.inject_keycode.metastate &=
-        ~(AMETA_CTRL_RIGHT_ON | AMETA_META_LEFT_ON | AMETA_META_RIGHT_ON);
-    // Enable LCtrl
-    msg.inject_keycode.metastate |= AMETA_CTRL_LEFT_ON;
-
-    if (!controller_push_msg(im->controller, &msg)) {
-        LOGW("Could not request 'inject keycode'");
-    }
-}
-
 void
 input_manager_process_key(struct input_manager *im,
                           const SDL_KeyboardEvent *event,
@@ -267,69 +259,64 @@ input_manager_process_key(struct input_manager *im,
     // control: indicates the state of the command-line option --no-control
     // ctrl: the Ctrl key
 
-    bool lctrl = event->keysym.mod & KMOD_LCTRL;
-    bool rctrl = event->keysym.mod & KMOD_RCTRL;
-    bool alt = event->keysym.mod & (KMOD_LALT | KMOD_RALT);
+    // Only capture Left-Ctrl, Right-Ctrl is forwarded to the device
+    bool ctrl = event->keysym.mod & KMOD_LCTRL;
     bool meta = event->keysym.mod & (KMOD_LGUI | KMOD_RGUI);
-    bool shift = event->keysym.mod & (KMOD_LSHIFT | KMOD_RSHIFT);
 
-    bool shortcut_key = rctrl;
+    // use Cmd on macOS, Ctrl on other platforms
 #ifdef __APPLE__
-    shortcut_key |= meta;
+    bool cmd = !ctrl && meta;
 #else
     if (meta) {
-        // No shortcut involve Meta, and it is not forwarded to the device
+        // no shortcuts involve Meta on platforms other than macOS, and it must
+        // not be forwarded to the device
         return;
     }
+    bool cmd = ctrl; // && !meta, already guaranteed
 #endif
 
-    if (alt) {
-        // No shortcuts involve Alt, and it is not forwarded to the device
-        return;
-    }
-
     struct controller *controller = im->controller;
 
-    SDL_Keycode keycode = event->keysym.sym;
-    bool down = event->type == SDL_KEYDOWN;
-
-    // Capture all RCtrl events
-    if (shortcut_key) {
+    // capture all Ctrl events
+    if (ctrl || cmd) {
+        SDL_Keycode keycode = event->keysym.sym;
+        bool down = event->type == SDL_KEYDOWN;
         int action = down ? ACTION_DOWN : ACTION_UP;
         bool repeat = event->repeat;
+        bool shift = event->keysym.mod & (KMOD_LSHIFT | KMOD_RSHIFT);
         switch (keycode) {
             case SDLK_h:
                 // Ctrl+h on all platform, since Cmd+h is already captured by
                 // the system on macOS to hide the window
-                if (control && !shift && !repeat) {
+                if (control && ctrl && !meta && !shift && !repeat) {
                     action_home(controller, action);
                 }
                 return;
             case SDLK_b: // fall-through
             case SDLK_BACKSPACE:
-                if (control && !shift && !repeat) {
+                if (control && cmd && !shift && !repeat) {
                     action_back(controller, action);
                 }
                 return;
             case SDLK_s:
-                if (control && !shift && !repeat) {
+                if (control && cmd && !shift && !repeat) {
                     action_app_switch(controller, action);
                 }
                 return;
             case SDLK_m:
                 // Ctrl+m on all platform, since Cmd+m is already captured by
                 // the system on macOS to minimize the window
-                if (control && !shift && !repeat) {
+                if (control && ctrl && !meta && !shift && !repeat) {
                     action_menu(controller, action);
                 }
                 return;
             case SDLK_p:
-                if (control && !shift && !repeat) {
+                if (control && cmd && !shift && !repeat) {
                     action_power(controller, action);
                 }
                 return;
             case SDLK_o:
-                if (control && !repeat && down) {
+                if (control && cmd && down) {
                     enum screen_power_mode mode = shift
                                                 ? SCREEN_POWER_MODE_NORMAL
                                                 : SCREEN_POWER_MODE_OFF;
@@ -337,57 +324,67 @@ input_manager_process_key(struct input_manager *im,
                 }
                 return;
             case SDLK_DOWN:
-                if (control && !shift) {
+                if (control && cmd && !shift) {
                     // forward repeated events
                     action_volume_down(controller, action);
                 }
                 return;
             case SDLK_UP:
-                if (control && !shift) {
+                if (control && cmd && !shift) {
                     // forward repeated events
                     action_volume_up(controller, action);
                 }
                 return;
             case SDLK_LEFT:
-                if (!shift && !repeat && down) {
+                if (cmd && !shift && down) {
                     rotate_client_left(im->screen);
                 }
                 return;
             case SDLK_RIGHT:
-                if (!shift && !repeat && down) {
+                if (cmd && !shift && down) {
                     rotate_client_right(im->screen);
                 }
                 return;
+            case SDLK_c:
+                if (control && cmd && !shift && !repeat && down) {
+                    request_device_clipboard(controller);
+                }
+                return;
             case SDLK_v:
-                if (control && !shift && !repeat && down) {
-                    // Inject the text as input events
-                    clipboard_paste(controller);
+                if (control && cmd && !repeat && down) {
+                    if (shift) {
+                        // store the text in the device clipboard and paste
+                        set_device_clipboard(controller, true);
+                    } else {
+                        // inject the text as input events
+                        clipboard_paste(controller);
+                    }
                 }
                 return;
             case SDLK_f:
-                if (!shift && !repeat && down) {
+                if (!shift && cmd && !repeat && down) {
                     screen_switch_fullscreen(im->screen);
                 }
                 return;
-            case SDLK_w:
-                if (!shift && !repeat && down) {
+            case SDLK_x:
+                if (!shift && cmd && !repeat && down) {
                     screen_resize_to_fit(im->screen);
                 }
                 return;
             case SDLK_g:
-                if (!shift && !repeat && down) {
+                if (!shift && cmd && !repeat && down) {
                     screen_resize_to_pixel_perfect(im->screen);
                 }
                 return;
             case SDLK_i:
-                if (!shift && !repeat && down) {
+                if (!shift && cmd && !repeat && down) {
                     struct fps_counter *fps_counter =
                         im->video_buffer->fps_counter;
                     switch_fps_counter_state(fps_counter);
                 }
                 return;
             case SDLK_n:
-                if (control && !repeat && down) {
+                if (control && cmd && !repeat && down) {
                     if (shift) {
                         collapse_notification_panel(controller);
                     } else {
@@ -396,19 +393,10 @@ input_manager_process_key(struct input_manager *im,
                 }
                 return;
             case SDLK_r:
-                if (control && !shift && !repeat && down) {
+                if (control && cmd && !shift && !repeat && down) {
                     rotate_device(controller);
                 }
                 return;
-            case SDLK_c:
-            case SDLK_x:
-                if (control && !shift) {
-                    // For convenience, forward shortcut_key+c and
-                    // shortcut_key+x as Ctrl+c and Ctrl+x (typically "copy" and
-                    // "cut", but not always) to the device
-                    inject_as_ctrl(im, event);
-                }
-                return;
         }
 
         return;
@@ -418,12 +406,6 @@ input_manager_process_key(struct input_manager *im,
         return;
     }
 
-    if (lctrl && !shift && keycode == SDLK_v && down) {
-        // Synchronize the computer clipboard to the device clipboard before
-        // sending Ctrl+V, to allow seamless copy-paste.
-        set_device_clipboard(controller);
-    }
-
     struct control_msg msg;
     if (convert_input_key(event, &msg, im->prefer_text)) {
         if (!controller_push_msg(controller, &msg)) {

app/src/main.c

@@ -42,7 +42,7 @@ convert_log_level_to_sdl(enum sc_log_level level) {
             return SDL_LOG_PRIORITY_ERROR;
         default:
             assert(!"unexpected log level");
-            return SDL_LOG_PRIORITY_INFO;
+            return SC_LOG_LEVEL_INFO;
     }
 }
 
@@ -71,7 +71,7 @@ main(int argc, char *argv[]) {
     }
 
     SDL_LogPriority sdl_log = convert_log_level_to_sdl(args.opts.log_level);
-    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, sdl_log);
+    SDL_LogSetAllPriority(sdl_log);
 
     if (args.help) {
         scrcpy_print_usage(argv[0]);

app/src/receiver.c

@@ -60,29 +60,28 @@ static int
 run_receiver(void *data) {
     struct receiver *receiver = data;
 
-    static unsigned char buf[DEVICE_MSG_MAX_SIZE];
+    unsigned char buf[DEVICE_MSG_SERIALIZED_MAX_SIZE];
     size_t head = 0;
 
     for (;;) {
-        assert(head < DEVICE_MSG_MAX_SIZE);
-        ssize_t r = net_recv(receiver->control_socket, buf + head,
-                             DEVICE_MSG_MAX_SIZE - head);
+        assert(head < DEVICE_MSG_SERIALIZED_MAX_SIZE);
+        ssize_t r = net_recv(receiver->control_socket, buf,
+                             DEVICE_MSG_SERIALIZED_MAX_SIZE - head);
         if (r <= 0) {
             LOGD("Receiver stopped");
             break;
         }
 
-        head += r;
-        ssize_t consumed = process_msgs(buf, head);
+        ssize_t consumed = process_msgs(buf, r);
         if (consumed == -1) {
             // an error occurred
             break;
         }
 
         if (consumed) {
-            head -= consumed;
             // shift the remaining data in the buffer
-            memmove(buf, &buf[consumed], head);
+            memmove(buf, &buf[consumed], r - consumed);
+            head = r - consumed;
         }
     }
 

app/tests/test_control_msg_serialize.c

@@ -13,7 +13,7 @@ static void test_serialize_inject_keycode(void) {
         },
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 10);
 
@@ -34,13 +34,13 @@ static void test_serialize_inject_text(void) {
         },
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
-    assert(size == 18);
+    assert(size == 16);
 
     const unsigned char expected[] = {
         CONTROL_MSG_TYPE_INJECT_TEXT,
-        0x00, 0x00, 0x00, 0x0d, // text length
+        0x00, 0x0d, // text length
         'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', // text
     };
     assert(!memcmp(buf, expected, sizeof(expected)));
@@ -54,17 +54,15 @@ static void test_serialize_inject_text_long(void) {
     text[CONTROL_MSG_INJECT_TEXT_MAX_LENGTH] = '\0';
     msg.inject_text.text = text;
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
-    assert(size == 5 + CONTROL_MSG_INJECT_TEXT_MAX_LENGTH);
+    assert(size == 3 + CONTROL_MSG_INJECT_TEXT_MAX_LENGTH);
 
-    unsigned char expected[5 + CONTROL_MSG_INJECT_TEXT_MAX_LENGTH];
+    unsigned char expected[3 + CONTROL_MSG_INJECT_TEXT_MAX_LENGTH];
     expected[0] = CONTROL_MSG_TYPE_INJECT_TEXT;
-    expected[1] = 0x00;
-    expected[2] = 0x00;
-    expected[3] = 0x01;
-    expected[4] = 0x2c; // text length (32 bits)
-    memset(&expected[5], 'a', CONTROL_MSG_INJECT_TEXT_MAX_LENGTH);
+    expected[1] = 0x01;
+    expected[2] = 0x2c; // text length (16 bits)
+    memset(&expected[3], 'a', CONTROL_MSG_INJECT_TEXT_MAX_LENGTH);
 
     assert(!memcmp(buf, expected, sizeof(expected)));
 }
@@ -90,7 +88,7 @@ static void test_serialize_inject_touch_event(void) {
         },
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 28);
 
@@ -125,7 +123,7 @@ static void test_serialize_inject_scroll_event(void) {
         },
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 21);
 
@@ -144,7 +142,7 @@ static void test_serialize_back_or_screen_on(void) {
         .type = CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON,
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 1);
 
@@ -159,7 +157,7 @@ static void test_serialize_expand_notification_panel(void) {
         .type = CONTROL_MSG_TYPE_EXPAND_NOTIFICATION_PANEL,
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 1);
 
@@ -174,7 +172,7 @@ static void test_serialize_collapse_notification_panel(void) {
         .type = CONTROL_MSG_TYPE_COLLAPSE_NOTIFICATION_PANEL,
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 1);
 
@@ -189,7 +187,7 @@ static void test_serialize_get_clipboard(void) {
         .type = CONTROL_MSG_TYPE_GET_CLIPBOARD,
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 1);
 
@@ -203,17 +201,19 @@ static void test_serialize_set_clipboard(void) {
     struct control_msg msg = {
         .type = CONTROL_MSG_TYPE_SET_CLIPBOARD,
         .set_clipboard = {
+            .paste = true,
             .text = "hello, world!",
         },
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
-    assert(size == 18);
+    assert(size == 17);
 
     const unsigned char expected[] = {
         CONTROL_MSG_TYPE_SET_CLIPBOARD,
-        0x00, 0x00, 0x00, 0x0d, // text length
+        1, // paste
+        0x00, 0x0d, // text length
         'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', // text
     };
     assert(!memcmp(buf, expected, sizeof(expected)));
@@ -227,7 +227,7 @@ static void test_serialize_set_screen_power_mode(void) {
         },
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 2);
 
@@ -243,7 +243,7 @@ static void test_serialize_rotate_device(void) {
         .type = CONTROL_MSG_TYPE_ROTATE_DEVICE,
     };
 
-    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    unsigned char buf[CONTROL_MSG_SERIALIZED_MAX_SIZE];
     int size = control_msg_serialize(&msg, buf);
     assert(size == 1);
 

app/tests/test_device_msg_deserialize.c

@@ -4,17 +4,16 @@
 #include "device_msg.h"
 
 #include <stdio.h>
-
 static void test_deserialize_clipboard(void) {
     const unsigned char input[] = {
         DEVICE_MSG_TYPE_CLIPBOARD,
-        0x00, 0x00, 0x00, 0x03, // text length
+        0x00, 0x03, // text length
         0x41, 0x42, 0x43, // "ABC"
     };
 
     struct device_msg msg;
     ssize_t r = device_msg_deserialize(input, sizeof(input), &msg);
-    assert(r == 8);
+    assert(r == 6);
 
     assert(msg.type == DEVICE_MSG_TYPE_CLIPBOARD);
     assert(msg.clipboard.text);
@@ -23,30 +22,7 @@ static void test_deserialize_clipboard(void) {
     device_msg_destroy(&msg);
 }
 
-static void test_deserialize_clipboard_big(void) {
-    unsigned char input[DEVICE_MSG_MAX_SIZE];
-    input[0] = DEVICE_MSG_TYPE_CLIPBOARD;
-    input[1] = (DEVICE_MSG_TEXT_MAX_LENGTH & 0xff000000u) >> 24;
-    input[2] = (DEVICE_MSG_TEXT_MAX_LENGTH & 0x00ff0000u) >> 16;
-    input[3] = (DEVICE_MSG_TEXT_MAX_LENGTH & 0x0000ff00u) >> 8;
-    input[4] =  DEVICE_MSG_TEXT_MAX_LENGTH & 0x000000ffu;
-
-    memset(input + 5, 'a', DEVICE_MSG_TEXT_MAX_LENGTH);
-
-    struct device_msg msg;
-    ssize_t r = device_msg_deserialize(input, sizeof(input), &msg);
-    assert(r == DEVICE_MSG_MAX_SIZE);
-
-    assert(msg.type == DEVICE_MSG_TYPE_CLIPBOARD);
-    assert(msg.clipboard.text);
-    assert(strlen(msg.clipboard.text) == DEVICE_MSG_TEXT_MAX_LENGTH);
-    assert(msg.clipboard.text[0] == 'a');
-
-    device_msg_destroy(&msg);
-}
-
 int main(void) {
     test_deserialize_clipboard();
-    test_deserialize_clipboard_big();
     return 0;
 }

server/src/main/java/com/genymobile/scrcpy/ControlMessage.java

@@ -17,6 +17,8 @@ public final class ControlMessage {
     public static final int TYPE_SET_SCREEN_POWER_MODE = 9;
     public static final int TYPE_ROTATE_DEVICE = 10;
 
+    public static final int FLAGS_PASTE = 1;
+
     private int type;
     private String text;
     private int metaState; // KeyEvent.META_*
@@ -28,6 +30,7 @@ public final class ControlMessage {
     private Position position;
     private int hScroll;
     private int vScroll;
+    private int flags;
 
     private ControlMessage() {
     }
@@ -68,10 +71,13 @@ public final class ControlMessage {
         return msg;
     }
 
-    public static ControlMessage createSetClipboard(String text) {
+    public static ControlMessage createSetClipboard(String text, boolean paste) {
         ControlMessage msg = new ControlMessage();
         msg.type = TYPE_SET_CLIPBOARD;
         msg.text = text;
+        if (paste) {
+            msg.flags = FLAGS_PASTE;
+        }
         return msg;
     }
 
@@ -134,4 +140,8 @@ public final class ControlMessage {
     public int getVScroll() {
         return vScroll;
     }
+
+    public int getFlags() {
+        return flags;
+    }
 }

server/src/main/java/com/genymobile/scrcpy/ControlMessageReader.java

@@ -12,14 +12,16 @@ public class ControlMessageReader {
     static final int INJECT_TOUCH_EVENT_PAYLOAD_LENGTH = 27;
     static final int INJECT_SCROLL_EVENT_PAYLOAD_LENGTH = 20;
     static final int SET_SCREEN_POWER_MODE_PAYLOAD_LENGTH = 1;
+    static final int SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH = 1;
 
-    private static final int MESSAGE_MAX_SIZE = 1 << 18; // 256k
-
-    public static final int CLIPBOARD_TEXT_MAX_LENGTH = MESSAGE_MAX_SIZE - 5; // type: 1 byte; length: 4 bytes
+    public static final int CLIPBOARD_TEXT_MAX_LENGTH = 4092; // 4096 - 1 (type) - 1 (parse flag) - 2 (length)
     public static final int INJECT_TEXT_MAX_LENGTH = 300;
 
-    private final byte[] rawBuffer = new byte[MESSAGE_MAX_SIZE];
+    private static final int RAW_BUFFER_SIZE = 4096;
+
+    private final byte[] rawBuffer = new byte[RAW_BUFFER_SIZE];
     private final ByteBuffer buffer = ByteBuffer.wrap(rawBuffer);
+    private final byte[] textBuffer = new byte[CLIPBOARD_TEXT_MAX_LENGTH];
 
     public ControlMessageReader() {
         // invariant: the buffer is always in "get" mode
@@ -102,17 +104,15 @@ public class ControlMessageReader {
     }
 
     private String parseString() {
-        if (buffer.remaining() < 4) {
+        if (buffer.remaining() < 2) {
             return null;
         }
-        int len = buffer.getInt();
+        int len = toUnsigned(buffer.getShort());
         if (buffer.remaining() < len) {
             return null;
         }
-        int position = buffer.position();
-        // Move the buffer position to consume the text
-        buffer.position(position + len);
-        return new String(rawBuffer, position, len, StandardCharsets.UTF_8);
+        buffer.get(textBuffer, 0, len);
+        return new String(textBuffer, 0, len, StandardCharsets.UTF_8);
     }
 
     private ControlMessage parseInjectText() {
@@ -149,11 +149,15 @@ public class ControlMessageReader {
     }
 
     private ControlMessage parseSetClipboard() {
+        if (buffer.remaining() < SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH) {
+            return null;
+        }
+        boolean parse = buffer.get() != 0;
         String text = parseString();
         if (text == null) {
             return null;
         }
-        return ControlMessage.createSetClipboard(text);
+        return ControlMessage.createSetClipboard(text, parse);
     }
 
     private ControlMessage parseSetScreenPowerMode() {

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -1,5 +1,6 @@
 package com.genymobile.scrcpy;
 
+import android.os.Build;
 import android.os.SystemClock;
 import android.view.InputDevice;
 import android.view.KeyCharacterMap;
@@ -109,7 +110,8 @@ public class Controller {
                 }
                 break;
             case ControlMessage.TYPE_SET_CLIPBOARD:
-                setClipboard(msg.getText());
+                boolean paste = (msg.getFlags() & ControlMessage.FLAGS_PASTE) != 0;
+                setClipboard(msg.getText(), paste);
                 break;
             case ControlMessage.TYPE_SET_SCREEN_POWER_MODE:
                 if (device.supportsInputEvents()) {
@@ -227,13 +229,17 @@ public class Controller {
         return device.injectKeycode(keycode);
     }
 
-    private boolean setClipboard(String text) {
+    private boolean setClipboard(String text, boolean paste) {
         boolean ok = device.setClipboardText(text);
         if (ok) {
             Ln.i("Device clipboard set");
-            return true;
         }
 
-        return false;
+        // On Android >= 7, also press the PASTE key if requested
+        if (paste && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && device.supportsInputEvents()) {
+            device.injectKeycode(KeyEvent.KEYCODE_PASTE);
+        }
+
+        return ok;
     }
 }

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -207,14 +207,6 @@ public final class Device {
     }
 
     public boolean setClipboardText(String text) {
-        String currentClipboard = getClipboardText();
-        if (currentClipboard == null || currentClipboard.equals("text")) {
-            // The clipboard already contains the requested text.
-            // Since pasting text from the computer involves setting the device clipboard, it could be set twice on a copy-paste. This would cause
-            // the clipboard listeners to be notified twice, and that would flood the Android keyboard clipboard history. To workaround this
-            // problem, do not explicitly set the clipboard text if it already contains the expected content.
-            return false;
-        }
         isSettingClipboard.set(true);
         boolean ok = serviceManager.getClipboardManager().setText(text);
         isSettingClipboard.set(false);

server/src/main/java/com/genymobile/scrcpy/DeviceMessageWriter.java

@@ -7,10 +7,10 @@ import java.nio.charset.StandardCharsets;
 
 public class DeviceMessageWriter {
 
-    private static final int MESSAGE_MAX_SIZE = 1 << 18; // 256k
-    public static final int CLIPBOARD_TEXT_MAX_LENGTH = MESSAGE_MAX_SIZE - 5; // type: 1 byte; length: 4 bytes
+    public static final int CLIPBOARD_TEXT_MAX_LENGTH = 4093;
+    private static final int MAX_EVENT_SIZE = CLIPBOARD_TEXT_MAX_LENGTH + 3;
 
-    private final byte[] rawBuffer = new byte[MESSAGE_MAX_SIZE];
+    private final byte[] rawBuffer = new byte[MAX_EVENT_SIZE];
     private final ByteBuffer buffer = ByteBuffer.wrap(rawBuffer);
 
     public void writeTo(DeviceMessage msg, OutputStream output) throws IOException {
@@ -21,7 +21,7 @@ public class DeviceMessageWriter {
                 String text = msg.getText();
                 byte[] raw = text.getBytes(StandardCharsets.UTF_8);
                 int len = StringUtils.getUtf8TruncationIndex(raw, CLIPBOARD_TEXT_MAX_LENGTH);
-                buffer.putInt(len);
+                buffer.putShort((short) len);
                 buffer.put(raw, 0, len);
                 output.write(rawBuffer, 0, buffer.position());
                 break;

server/src/test/java/com/genymobile/scrcpy/ControlMessageReaderTest.java

@@ -48,7 +48,7 @@ public class ControlMessageReaderTest {
         DataOutputStream dos = new DataOutputStream(bos);
         dos.writeByte(ControlMessage.TYPE_INJECT_TEXT);
         byte[] text = "testé".getBytes(StandardCharsets.UTF_8);
-        dos.writeInt(text.length);
+        dos.writeShort(text.length);
         dos.write(text);
         byte[] packet = bos.toByteArray();
 
@@ -68,7 +68,7 @@ public class ControlMessageReaderTest {
         dos.writeByte(ControlMessage.TYPE_INJECT_TEXT);
         byte[] text = new byte[ControlMessageReader.INJECT_TEXT_MAX_LENGTH];
         Arrays.fill(text, (byte) 'a');
-        dos.writeInt(text.length);
+        dos.writeShort(text.length);
         dos.write(text);
         byte[] packet = bos.toByteArray();
 
@@ -216,8 +216,9 @@ public class ControlMessageReaderTest {
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         DataOutputStream dos = new DataOutputStream(bos);
         dos.writeByte(ControlMessage.TYPE_SET_CLIPBOARD);
+        dos.writeByte(1); // paste
         byte[] text = "testé".getBytes(StandardCharsets.UTF_8);
-        dos.writeInt(text.length);
+        dos.writeShort(text.length);
         dos.write(text);
 
         byte[] packet = bos.toByteArray();
@@ -227,6 +228,9 @@ public class ControlMessageReaderTest {
 
         Assert.assertEquals(ControlMessage.TYPE_SET_CLIPBOARD, event.getType());
         Assert.assertEquals("testé", event.getText());
+
+        boolean parse = (event.getFlags() & ControlMessage.FLAGS_PASTE) != 0;
+        Assert.assertTrue(parse);
     }
 
     @Test
@@ -238,10 +242,11 @@ public class ControlMessageReaderTest {
         dos.writeByte(ControlMessage.TYPE_SET_CLIPBOARD);
 
         byte[] rawText = new byte[ControlMessageReader.CLIPBOARD_TEXT_MAX_LENGTH];
+        dos.writeByte(1); // paste
         Arrays.fill(rawText, (byte) 'a');
         String text = new String(rawText, 0, rawText.length);
 
-        dos.writeInt(rawText.length);
+        dos.writeShort(rawText.length);
         dos.write(rawText);
 
         byte[] packet = bos.toByteArray();
@@ -251,6 +256,9 @@ public class ControlMessageReaderTest {
 
         Assert.assertEquals(ControlMessage.TYPE_SET_CLIPBOARD, event.getType());
         Assert.assertEquals(text, event.getText());
+
+        boolean parse = (event.getFlags() & ControlMessage.FLAGS_PASTE) != 0;
+        Assert.assertTrue(parse);
     }
 
     @Test

server/src/test/java/com/genymobile/scrcpy/DeviceMessageWriterTest.java

@@ -19,7 +19,7 @@ public class DeviceMessageWriterTest {
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         DataOutputStream dos = new DataOutputStream(bos);
         dos.writeByte(DeviceMessage.TYPE_CLIPBOARD);
-        dos.writeInt(data.length);
+        dos.writeShort(data.length);
         dos.write(data);
 
         byte[] expected = bos.toByteArray();