xkeymap.c

Linux环境下的远程登陆客户端软件,其采用RDP协议

				return True;
			break;

	}
	return False;
}


key_translation
xkeymap_translate_key(uint32 keysym, unsigned int keycode, unsigned int state)
{
	key_translation tr = { 0, 0 };

	tr = keymap[keysym & KEYMAP_MASK];

	if (tr.modifiers & MapInhibitMask)
	{
		DEBUG_KBD(("Inhibiting key\n"));
		tr.scancode = 0;
		return tr;
	}

	if (tr.modifiers & MapLocalStateMask)
	{
		/* The modifiers to send for this key should be obtained
		   from the local state. Currently, only shift is implemented. */
		if (state & ShiftMask)
		{
			tr.modifiers = MapLeftShiftMask;
		}
	}

	if (((remote_modifier_state & MapLeftCtrlMask)
	     || (remote_modifier_state & MapRightCtrlMask)) && get_key_state(state, XK_Caps_Lock))
	{
		DEBUG_KBD(("CapsLock + Ctrl pressed, releasing LeftShift\n"));
		tr.modifiers ^= MapLeftShiftMask;
	}

	if (tr.scancode != 0)
	{
		DEBUG_KBD(("Found key translation, scancode=0x%x, modifiers=0x%x\n",
			   tr.scancode, tr.modifiers));
		return tr;
	}

	if (keymap_loaded)
		warning("No translation for (keysym 0x%lx, %s)\n", keysym, get_ksname(keysym));

	/* not in keymap, try to interpret the raw scancode */
	if (((int) keycode >= min_keycode) && (keycode <= 0x60))
	{
		tr.scancode = keycode - min_keycode;

		/* The modifiers to send for this key should be
		   obtained from the local state. Currently, only
		   shift is implemented. */
		if (state & ShiftMask)
		{
			tr.modifiers = MapLeftShiftMask;
		}

		DEBUG_KBD(("Sending guessed scancode 0x%x\n", tr.scancode));
	}
	else
	{
		DEBUG_KBD(("No good guess for keycode 0x%x found\n", keycode));
	}

	return tr;
}

uint16
xkeymap_translate_button(unsigned int button)
{
	switch (button)
	{
		case Button1:	/* left */
			return MOUSE_FLAG_BUTTON1;
		case Button2:	/* middle */
			return MOUSE_FLAG_BUTTON3;
		case Button3:	/* right */
			return MOUSE_FLAG_BUTTON2;
		case Button4:	/* wheel up */
			return MOUSE_FLAG_BUTTON4;
		case Button5:	/* wheel down */
			return MOUSE_FLAG_BUTTON5;
	}

	return 0;
}

char *
get_ksname(uint32 keysym)
{
	char *ksname = NULL;

	if (keysym == NoSymbol)
		ksname = "NoSymbol";
	else if (!(ksname = XKeysymToString(keysym)))
		ksname = "(no name)";

	return ksname;
}

static BOOL
is_modifier(uint8 scancode)
{
	switch (scancode)
	{
		case SCANCODE_CHAR_LSHIFT:
		case SCANCODE_CHAR_RSHIFT:
		case SCANCODE_CHAR_LCTRL:
		case SCANCODE_CHAR_RCTRL:
		case SCANCODE_CHAR_LALT:
		case SCANCODE_CHAR_RALT:
		case SCANCODE_CHAR_LWIN:
		case SCANCODE_CHAR_RWIN:
		case SCANCODE_CHAR_NUMLOCK:
			return True;
		default:
			break;
	}
	return False;
}

void
save_remote_modifiers(uint8 scancode)
{
	if (is_modifier(scancode))
		return;

	saved_remote_modifier_state = remote_modifier_state;
}

void
restore_remote_modifiers(uint32 ev_time, uint8 scancode)
{
	key_translation dummy;

	if (is_modifier(scancode))
		return;

	dummy.scancode = 0;
	dummy.modifiers = saved_remote_modifier_state;
	ensure_remote_modifiers(ev_time, dummy);
}

void
ensure_remote_modifiers(uint32 ev_time, key_translation tr)
{
	/* If this key is a modifier, do nothing */
	if (is_modifier(tr.scancode))
		return;

	if (!g_numlock_sync)
	{
		/* NumLock */
		if (MASK_HAS_BITS(tr.modifiers, MapNumLockMask)
		    != MASK_HAS_BITS(remote_modifier_state, MapNumLockMask))
		{
			/* The remote modifier state is not correct */
			uint16 new_remote_state;

			if (MASK_HAS_BITS(tr.modifiers, MapNumLockMask))
			{
				DEBUG_KBD(("Remote NumLock state is incorrect, activating NumLock.\n"));
				new_remote_state = KBD_FLAG_NUMLOCK;
				remote_modifier_state = MapNumLockMask;
			}
			else
			{
				DEBUG_KBD(("Remote NumLock state is incorrect, deactivating NumLock.\n"));
				new_remote_state = 0;
				remote_modifier_state = 0;
			}

			rdp_send_input(0, RDP_INPUT_SYNCHRONIZE, 0, new_remote_state, 0);
		}
	}


	/* Shift. Left shift and right shift are treated as equal; either is fine. */
	if (MASK_HAS_BITS(tr.modifiers, MapShiftMask)
	    != MASK_HAS_BITS(remote_modifier_state, MapShiftMask))
	{
		/* The remote modifier state is not correct */
		if (MASK_HAS_BITS(tr.modifiers, MapLeftShiftMask))
		{
			/* Needs left shift. Send down. */
			rdp_send_scancode(ev_time, RDP_KEYPRESS, SCANCODE_CHAR_LSHIFT);
		}
		else if (MASK_HAS_BITS(tr.modifiers, MapRightShiftMask))
		{
			/* Needs right shift. Send down. */
			rdp_send_scancode(ev_time, RDP_KEYPRESS, SCANCODE_CHAR_RSHIFT);
		}
		else
		{
			/* Should not use this modifier. Send up for shift currently pressed. */
			if (MASK_HAS_BITS(remote_modifier_state, MapLeftShiftMask))
				/* Left shift is down */
				rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_LSHIFT);
			else
				/* Right shift is down */
				rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_RSHIFT);
		}
	}

	/* AltGr */
	if (MASK_HAS_BITS(tr.modifiers, MapAltGrMask)
	    != MASK_HAS_BITS(remote_modifier_state, MapAltGrMask))
	{
		/* The remote modifier state is not correct */
		if (MASK_HAS_BITS(tr.modifiers, MapAltGrMask))
		{
			/* Needs this modifier. Send down. */
			rdp_send_scancode(ev_time, RDP_KEYPRESS, SCANCODE_CHAR_RALT);
		}
		else
		{
			/* Should not use this modifier. Send up. */
			rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_RALT);
		}
	}


}


unsigned int
read_keyboard_state()
{
#ifdef RDP2VNC
	return 0;
#else
	unsigned int state;
	Window wdummy;
	int dummy;

	XQueryPointer(g_display, g_wnd, &wdummy, &wdummy, &dummy, &dummy, &dummy, &dummy, &state);
	return state;
#endif
}


uint16
ui_get_numlock_state(unsigned int state)
{
	uint16 numlock_state = 0;

	if (get_key_state(state, XK_Num_Lock))
		numlock_state = KBD_FLAG_NUMLOCK;

	return numlock_state;
}


void
reset_modifier_keys()
{
	unsigned int state = read_keyboard_state();

	/* reset keys */
	uint32 ev_time;
	ev_time = time(NULL);

	if (MASK_HAS_BITS(remote_modifier_state, MapLeftShiftMask)
	    && !get_key_state(state, XK_Shift_L))
		rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_LSHIFT);

	if (MASK_HAS_BITS(remote_modifier_state, MapRightShiftMask)
	    && !get_key_state(state, XK_Shift_R))
		rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_RSHIFT);

	if (MASK_HAS_BITS(remote_modifier_state, MapLeftCtrlMask)
	    && !get_key_state(state, XK_Control_L))
		rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_LCTRL);

	if (MASK_HAS_BITS(remote_modifier_state, MapRightCtrlMask)
	    && !get_key_state(state, XK_Control_R))
		rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_RCTRL);

	if (MASK_HAS_BITS(remote_modifier_state, MapLeftAltMask) && !get_key_state(state, XK_Alt_L))
		rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_LALT);

	if (MASK_HAS_BITS(remote_modifier_state, MapRightAltMask) &&
	    !get_key_state(state, XK_Alt_R) && !get_key_state(state, XK_Mode_switch)
	    && !get_key_state(state, XK_ISO_Level3_Shift))
		rdp_send_scancode(ev_time, RDP_KEYRELEASE, SCANCODE_CHAR_RALT);

	reset_winkey(ev_time);

	if (g_numlock_sync)
		rdp_send_input(ev_time, RDP_INPUT_SYNCHRONIZE, 0, ui_get_numlock_state(state), 0);
}


static void
update_modifier_state(uint8 scancode, BOOL pressed)
{
#ifdef WITH_DEBUG_KBD
	uint16 old_modifier_state;

	old_modifier_state = remote_modifier_state;
#endif

	switch (scancode)
	{
		case SCANCODE_CHAR_LSHIFT:
			MASK_CHANGE_BIT(remote_modifier_state, MapLeftShiftMask, pressed);
			break;
		case SCANCODE_CHAR_RSHIFT:
			MASK_CHANGE_BIT(remote_modifier_state, MapRightShiftMask, pressed);
			break;
		case SCANCODE_CHAR_LCTRL:
			MASK_CHANGE_BIT(remote_modifier_state, MapLeftCtrlMask, pressed);
			break;
		case SCANCODE_CHAR_RCTRL:
			MASK_CHANGE_BIT(remote_modifier_state, MapRightCtrlMask, pressed);
			break;
		case SCANCODE_CHAR_LALT:
			MASK_CHANGE_BIT(remote_modifier_state, MapLeftAltMask, pressed);
			break;
		case SCANCODE_CHAR_RALT:
			MASK_CHANGE_BIT(remote_modifier_state, MapRightAltMask, pressed);
			break;
		case SCANCODE_CHAR_LWIN:
			MASK_CHANGE_BIT(remote_modifier_state, MapLeftWinMask, pressed);
			break;
		case SCANCODE_CHAR_RWIN:
			MASK_CHANGE_BIT(remote_modifier_state, MapRightWinMask, pressed);
			break;
		case SCANCODE_CHAR_NUMLOCK:
			/* KeyReleases for NumLocks are sent immediately. Toggle the
			   modifier state only on Keypress */
			if (pressed && !g_numlock_sync)
			{
				BOOL newNumLockState;
				newNumLockState =
					(MASK_HAS_BITS
					 (remote_modifier_state, MapNumLockMask) == False);
				MASK_CHANGE_BIT(remote_modifier_state,
						MapNumLockMask, newNumLockState);
			}
	}

#ifdef WITH_DEBUG_KBD
	if (old_modifier_state != remote_modifier_state)
	{
		DEBUG_KBD(("Before updating modifier_state:0x%x, pressed=0x%x\n",
			   old_modifier_state, pressed));
		DEBUG_KBD(("After updating modifier_state:0x%x\n", remote_modifier_state));
	}
#endif

}

/* Send keyboard input */
void
rdp_send_scancode(uint32 time, uint16 flags, uint8 scancode)
{
	update_modifier_state(scancode, !(flags & RDP_KEYRELEASE));

	if (scancode & SCANCODE_EXTENDED)
	{
		DEBUG_KBD(("Sending extended scancode=0x%x, flags=0x%x\n",
			   scancode & ~SCANCODE_EXTENDED, flags));
		rdp_send_input(time, RDP_INPUT_SCANCODE, flags | KBD_FLAG_EXT,
			       scancode & ~SCANCODE_EXTENDED, 0);
	}
	else
	{
		DEBUG_KBD(("Sending scancode=0x%x, flags=0x%x\n", scancode, flags));
		rdp_send_input(time, RDP_INPUT_SCANCODE, flags, scancode, 0);
	}
}