vnc: add mouse button 6, 7, 8 support

vnc/vnc.c

@@ -547,7 +547,12 @@ lib_mod_event(struct vnc *v, int msg, long param1, long param2,
  }
  }
  }
- else if (msg >= 100 && msg <= 110) /* mouse events */
+ /* mouse events
+ *
+ * VNC supports up to 8 mouse buttons because mouse buttons are
+ * represented by 7 bits bitmask
+ */
+ else if (msg >= WM_MOUSEMOVE && msg <= WM_BUTTON8DOWN) /* 100 to 116 */
  {
  switch (msg)
  {
@@ -583,6 +588,24 @@ lib_mod_event(struct vnc *v, int msg, long param1, long param2,
  case WM_BUTTON5DOWN:
  v->mod_mouse_state |= 16;
  break;
+ case WM_BUTTON6UP:
+ v->mod_mouse_state &= ~32;
+ break;
+ case WM_BUTTON6DOWN:
+ v->mod_mouse_state |= 32;
+ break;
+ case WM_BUTTON7UP:
+ v->mod_mouse_state &= ~64;
+ break;
+ case WM_BUTTON7DOWN:
+ v->mod_mouse_state |= 64;
+ break;
+ case WM_BUTTON8UP:
+ v->mod_mouse_state &= ~128;
+ break;
+ case WM_BUTTON8DOWN:
+ v->mod_mouse_state |= 128;
+ break;
  }
 
  init_stream(s, 8192);