Make message buffer static

Now that the message max size is 256k, do not put the buffer on the
stack.

README.md

@@ -490,17 +490,19 @@ requested orientation.
 
 #### Copy-paste
 
-It is possible to synchronize clipboards between the computer and the device, in
-both directions:
+Any time the Android clipboard changes, it is automatically synchronized to the
+computer clipboard.
 
- - `RCtrl`+`c` copies the device clipboard to the computer clipboard;
- - `RCtrl`+`Shift`+`v` copies the computer clipboard to the device clipboard
-   (and pastes if the device runs Android >= 7);
- - `RCtrl`+`v` _pastes_ the computer clipboard as a sequence of text events (but
-   breaks non-ASCII characters).
+`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 events . This is useful when the component does not accept text
+pasting (for example in _Termux_), but it can break non-ASCII content.
+
+Another shortcut, `RCtrl`+`Shift`+`v`, only copies the computer clipboard to the
+device clipboard. This is useful when `Ctrl`+`v` does not paste on the device
+(for example, again, in _Termux_).
 
-Moreover, any time the Android clipboard changes, it is automatically
-synchronized to the computer clipboard.
 
 #### Text injection preference
 
@@ -563,13 +565,16 @@ Also see [issue #14].
 `RCtrl` is the right `Ctrl` key (the left `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`+`x` \| _Double-click¹_
+ | 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`
@@ -583,9 +588,8 @@ device).
  | Rotate device screen                        | `RCtrl`+`r`
  | Expand notification panel                   | `RCtrl`+`n`
  | Collapse notification panel                 | `RCtrl`+`Shift`+`n`
- | Copy device clipboard to computer           | `RCtrl`+`c`
- | Paste computer clipboard to device          | `RCtrl`+`v`
- | Copy computer clipboard to device and paste | `RCtrl`+`Shift`+`v`
+ | Inject computer clipboard text              | `RCtrl`+`v`
+ | Copy computer clipboard to device           | `RCtrl`+`Shift`+`v`
  | Enable/disable FPS counter (on stdout)      | `RCtrl`+`i`
 
 _¹Double-click on black borders to remove them._  

app/meson.build

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

app/scrcpy.1

@@ -222,7 +222,7 @@ Rotate display right
 Resize window to 1:1 (pixel\-perfect)
 
 .TP
-.B RCtrl+x, Double\-click on black borders
+.B RCtrl+w, Double\-click on black borders
 Resize window to remove black borders
 
 .TP
@@ -277,17 +277,13 @@ Expand notification panel
 .B RCtrl+Shift+n
 Collapse notification panel
 
-.TP
-.B RCtrl+c
-Copy device clipboard to computer
-
 .TP
 .B RCtrl+v
-Paste computer clipboard to device
+Inject computer clipboard text
 
 .TP
 .B RCtrl+Shift+v
-Copy computer clipboard to device (and paste if the device runs Android >= 7)
+Copy computer clipboard to device
 
 .TP
 .B RCtrl+i

app/src/cli.c

@@ -196,7 +196,7 @@ scrcpy_print_usage(const char *arg0) {
         "    RCtrl+g\n"
         "        Resize window to 1:1 (pixel-perfect)\n"
         "\n"
-        "    RCtrl+x\n"
+        "    RCtrl+w\n"
         "    Double-click on black borders\n"
         "        Resize window to remove black borders\n"
         "\n"
@@ -242,15 +242,11 @@ scrcpy_print_usage(const char *arg0) {
         "    RCtrl+Shift+n\n"
         "        Collapse notification panel\n"
         "\n"
-        "    RCtrl+c\n"
-        "        Copy device clipboard to computer\n"
-        "\n"
         "    RCtrl+v\n"
-        "        Paste computer clipboard to device\n"
+        "        Inject computer clipboard text\n"
         "\n"
         "    RCtrl+Shift+v\n"
-        "        Copy computer clipboard to device (and paste if the device\n"
-        "        runs Android >= 7)\n"
+        "        Copy computer clipboard to device\n"
         "\n"
         "    RCtrl+i\n"
         "        Enable/disable FPS counter (print frames/second in logs)\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_write16be(buf, (uint16_t) len);
-    memcpy(&buf[2], utf8, len);
-    return 2 + len;
+    buffer_write32be(buf, len);
+    memcpy(&buf[4], utf8, len);
+    return 4 + len;
 }
 
 static uint16_t
@@ -67,11 +67,10 @@ 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[2]);
-            return 2 + len;
+                                      &buf[1]);
+            return 1 + len;
         }
         case CONTROL_MSG_TYPE_SET_SCREEN_POWER_MODE:
             buf[1] = msg->set_screen_power_mode.mode;

app/src/control_msg.h

@@ -10,10 +10,11 @@
 #include "android/keycodes.h"
 #include "common.h"
 
+#define CONTROL_MSG_MAX_SIZE (1 << 18) // 256k
+
 #define CONTROL_MSG_INJECT_TEXT_MAX_LENGTH 300
-#define CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH 4092
-#define CONTROL_MSG_SERIALIZED_MAX_SIZE \
-    (4 + CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH)
+// type: 1 byte; length: 4 bytes
+#define CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH (CONTROL_MSG_MAX_SIZE - 5)
 
 #define POINTER_ID_MOUSE UINT64_C(-1);
 
@@ -62,7 +63,6 @@ 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_SERIALIZED_MAX_SIZE
+// buf size must be at least CONTROL_MSG_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) {
-    unsigned char serialized_msg[CONTROL_MSG_SERIALIZED_MAX_SIZE];
+    static unsigned char serialized_msg[CONTROL_MSG_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 < 3) {
+    if (len < 5) {
         // 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: {
-            uint16_t clipboard_len = buffer_read16be(&buf[1]);
-            if (clipboard_len > len - 3) {
+            size_t clipboard_len = buffer_read32be(&buf[1]);
+            if (clipboard_len > len - 5) {
                 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[3], clipboard_len);
+                memcpy(text, &buf[5], clipboard_len);
             }
             text[clipboard_len] = '\0';
 
             msg->clipboard.text = text;
-            return 3 + clipboard_len;
+            return 5 + clipboard_len;
         }
         default:
             LOGW("Unknown device message type: %d", (int) msg->type);

app/src/device_msg.h

@@ -7,8 +7,9 @@
 
 #include "config.h"
 
-#define DEVICE_MSG_TEXT_MAX_LENGTH 4093
-#define DEVICE_MSG_SERIALIZED_MAX_SIZE (3 + DEVICE_MSG_TEXT_MAX_LENGTH)
+#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)
 
 enum device_msg_type {
     DEVICE_MSG_TYPE_CLIPBOARD,

app/src/input_manager.c

@@ -102,17 +102,7 @@ collapse_notification_panel(struct controller *controller) {
 }
 
 static void
-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) {
+set_device_clipboard(struct controller *controller) {
     char *text = SDL_GetClipboardText();
     if (!text) {
         LOGW("Could not get clipboard text: %s", SDL_GetError());
@@ -127,7 +117,6 @@ set_device_clipboard(struct controller *controller, bool paste) {
     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);
@@ -252,6 +241,25 @@ 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,
@@ -259,25 +267,36 @@ 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);
     bool meta = event->keysym.mod & (KMOD_LGUI | KMOD_RGUI);
+    bool shift = event->keysym.mod & (KMOD_LSHIFT | KMOD_RSHIFT);
 
-    if (alt || meta) {
-        // No shortcuts involve Alt or Meta, and they are not forwarded to the
-        // device
+    bool shortcut_key = rctrl;
+#ifdef __APPLE__
+    shortcut_key |= meta;
+#else
+    if (meta) {
+        // No shortcut involve Meta, and it is not forwarded to the device
+        return;
+    }
+#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 (rctrl) {
-        SDL_Keycode keycode = event->keysym.sym;
-        bool down = event->type == SDL_KEYDOWN;
+    if (shortcut_key) {
         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
@@ -339,16 +358,11 @@ input_manager_process_key(struct input_manager *im,
                     rotate_client_right(im->screen);
                 }
                 return;
-            case SDLK_c:
-                if (control && !shift && !repeat && down) {
-                    request_device_clipboard(controller);
-                }
-                return;
             case SDLK_v:
                 if (control && !repeat && down) {
                     if (shift) {
-                        // store the text in the device clipboard and paste
-                        set_device_clipboard(controller, true);
+                        // store the text in the device clipboard
+                        set_device_clipboard(controller);
                     } else {
                         // inject the text as input events
                         clipboard_paste(controller);
@@ -360,7 +374,7 @@ input_manager_process_key(struct input_manager *im,
                     screen_switch_fullscreen(im->screen);
                 }
                 return;
-            case SDLK_x:
+            case SDLK_w:
                 if (!shift && !repeat && down) {
                     screen_resize_to_fit(im->screen);
                 }
@@ -391,6 +405,15 @@ input_manager_process_key(struct input_manager *im,
                     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;
@@ -400,6 +423,12 @@ 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/receiver.c

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

app/tests/test_control_msg_serialize.c

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

app/tests/test_device_msg_deserialize.c

@@ -4,16 +4,17 @@
 #include "device_msg.h"
 
 #include <stdio.h>
+
 static void test_deserialize_clipboard(void) {
     const unsigned char input[] = {
         DEVICE_MSG_TYPE_CLIPBOARD,
-        0x00, 0x03, // text length
+        0x00, 0x00, 0x00, 0x03, // text length
         0x41, 0x42, 0x43, // "ABC"
     };
 
     struct device_msg msg;
     ssize_t r = device_msg_deserialize(input, sizeof(input), &msg);
-    assert(r == 6);
+    assert(r == 8);
 
     assert(msg.type == DEVICE_MSG_TYPE_CLIPBOARD);
     assert(msg.clipboard.text);
@@ -22,7 +23,30 @@ 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

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

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

@@ -12,16 +12,14 @@ 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;
 
-    public static final int CLIPBOARD_TEXT_MAX_LENGTH = 4092; // 4096 - 1 (type) - 1 (parse flag) - 2 (length)
+    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 INJECT_TEXT_MAX_LENGTH = 300;
 
-    private static final int RAW_BUFFER_SIZE = 4096;
-
-    private final byte[] rawBuffer = new byte[RAW_BUFFER_SIZE];
+    private final byte[] rawBuffer = new byte[MESSAGE_MAX_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
@@ -104,15 +102,17 @@ public class ControlMessageReader {
     }
 
     private String parseString() {
-        if (buffer.remaining() < 2) {
+        if (buffer.remaining() < 4) {
             return null;
         }
-        int len = toUnsigned(buffer.getShort());
+        int len = buffer.getInt();
         if (buffer.remaining() < len) {
             return null;
         }
-        buffer.get(textBuffer, 0, len);
-        return new String(textBuffer, 0, len, StandardCharsets.UTF_8);
+        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);
     }
 
     private ControlMessage parseInjectText() {
@@ -149,15 +149,11 @@ 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, parse);
+        return ControlMessage.createSetClipboard(text);
     }
 
     private ControlMessage parseSetScreenPowerMode() {

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

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

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

@@ -207,6 +207,14 @@ 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 {
 
-    public static final int CLIPBOARD_TEXT_MAX_LENGTH = 4093;
-    private static final int MAX_EVENT_SIZE = CLIPBOARD_TEXT_MAX_LENGTH + 3;
+    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
 
-    private final byte[] rawBuffer = new byte[MAX_EVENT_SIZE];
+    private final byte[] rawBuffer = new byte[MESSAGE_MAX_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.putShort((short) len);
+                buffer.putInt(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.writeShort(text.length);
+        dos.writeInt(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.writeShort(text.length);
+        dos.writeInt(text.length);
         dos.write(text);
         byte[] packet = bos.toByteArray();
 
@@ -216,9 +216,8 @@ 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.writeShort(text.length);
+        dos.writeInt(text.length);
         dos.write(text);
 
         byte[] packet = bos.toByteArray();
@@ -228,9 +227,6 @@ 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
@@ -242,11 +238,10 @@ 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.writeShort(rawText.length);
+        dos.writeInt(rawText.length);
         dos.write(rawText);
 
         byte[] packet = bos.toByteArray();
@@ -256,9 +251,6 @@ 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.writeShort(data.length);
+        dos.writeInt(data.length);
         dos.write(data);
 
         byte[] expected = bos.toByteArray();