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nuttx/graphics/vnc/server/vnc_keymap.c

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/****************************************************************************
* graphics/vnc/vnc_keymap.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <errno.h>
#include <nuttx/ascii.h>
#define XK_MISCELLANY 1 /* Select X11 character set */
#define XK_LATIN1 1
#define XK_XKB_KEYS 1
#include <nuttx/nx/nx.h>
#include <nuttx/video/vnc.h>
#include <nuttx/input/x11_keysymdef.h>
#include <nuttx/input/kbd_codec.h>
#include "vnc_server.h"
#ifdef CONFIG_NX_KBD
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define FIRST_PRTCHAR ASCII_SPACE
#define LAST_PRTCHAR ASCII_TILDE
#define NPRTCHARS (ASCII_TILDE + ASCII_SPACE - 1)
#define ISPRINTABLE(c) ((c) >= FIRST_PRTCHAR && (c) <= LAST_PRTCHAR)
#define ISLOWERCASE(c) ((c) >= ASCII_a && (c) <= ASCII_z)
#define ISUPPERCASE(c) ((c) >= ASCII_A && (c) <= ASCII_Z)
#define ISALPHABETIC(c) (ISLOWERCASE(c) || ISUPPERCASE(c))
/****************************************************************************
* Private types
****************************************************************************/
enum vnc_modifier_e
{
MOD_SHIFT = 0, /* Left or right shift key */
MOD_CONTROL, /* Left or right control key */
MOD_ALT, /* Alt key */
MOD_CAPSLOCK, /* Caps lock */
MOD_SHIFTLOCK, /* Shift lock */
#ifdef CONFIG_VNCSERVER_KBDENCODE
MOD_SCROLLLOCK, /* Scroll lock */
MOD_NUMLOCK, /* Num lock */
#endif
NMODIFIERS
};
struct vnc_keymap_s
{
uint16_t nxcode;
uint16_t x11code;
};
/****************************************************************************
* Private Data
****************************************************************************/
/* Special key modifiers */
static const struct vnc_keymap_s g_modifiers[] =
{
{MOD_SHIFT, XK_Shift_L},
{MOD_SHIFT, XK_Shift_R},
{MOD_CONTROL, XK_Control_L},
{MOD_CONTROL, XK_Control_R},
{MOD_ALT, XK_Alt_L},
{MOD_ALT, XK_Alt_R},
{MOD_CAPSLOCK, XK_Caps_Lock},
{MOD_SHIFTLOCK, XK_Shift_Lock},
#ifdef CONFIG_VNCSERVER_KBDENCODE
{MOD_SCROLLLOCK, XK_Scroll_Lock},
{MOD_NUMLOCK, XK_Num_Lock},
#endif
};
#define G_MODIFIERS_NELEM (sizeof(g_modifiers) / sizeof(struct vnc_keymap_s))
/* Map special mappings for X11 codes to ASCII characters */
static const struct vnc_keymap_s g_asciimap[] =
{
/* Control characters */
#ifdef CONFIG_VNCSERVER_KBDENCODE
{ASCII_BS, XK_BackSpace},
#endif
{ASCII_TAB, XK_Tab},
{ASCII_LF, XK_Linefeed},
{ASCII_CR, XK_Return},
{ASCII_ESC, XK_Escape},
#ifdef CONFIG_VNCSERVER_KBDENCODE
{ASCII_DEL, XK_Delete},
#endif
/* Alternative encodings */
{'`', XK_dead_grave},
{'<EFBFBD>', XK_dead_acute},
{ASCII_TILDE, XK_dead_tilde},
{ASCII_CARET, XK_dead_circumflex},
/* Keypad aliases */
{ASCII_0, XK_KP_0},
{ASCII_1, XK_KP_1},
{ASCII_2, XK_KP_2},
{ASCII_3, XK_KP_3},
{ASCII_4, XK_KP_4},
{ASCII_5, XK_KP_5},
{ASCII_6, XK_KP_6},
{ASCII_7, XK_KP_7},
{ASCII_8, XK_KP_8},
{ASCII_9, XK_KP_9},
{ASCII_ASTERISK, XK_KP_Multiply},
{ASCII_PLUS, XK_KP_Add},
{ASCII_COMMA, XK_KP_Separator},
{ASCII_HYPHEN, XK_KP_Subtract},
{ASCII_PERIOD, XK_KP_Decimal},
{ASCII_DIVIDE, XK_KP_Divide},
{ASCII_SPACE, XK_KP_Space},
{ASCII_TAB, XK_KP_Tab},
{ASCII_CR, XK_KP_Enter}
#ifdef CONFIG_VNCSERVER_KBDENCODE
, {ASCII_DEL, XK_KP_Delete}
#endif
};
#define G_ASCIIMAP_NELEM (sizeof(g_asciimap) / sizeof(struct vnc_keymap_s))
#ifdef CONFIG_VNCSERVER_KBDENCODE
static const struct vnc_keymap_s g_cursor[] =
{
{KEYCODE_BACKDEL, XK_BackSpace},
{KEYCODE_FWDDEL, XK_Delete},
{KEYCODE_FWDDEL, XK_KP_Delete},
{KEYCODE_HOME, XK_Home},
{KEYCODE_HOME, XK_KP_Home},
{KEYCODE_END, XK_End},
{KEYCODE_END, XK_KP_End},
{KEYCODE_LEFT, XK_Left},
{KEYCODE_LEFT, XK_KP_Left},
{KEYCODE_RIGHT, XK_Right},
{KEYCODE_RIGHT, XK_KP_Right},
{KEYCODE_UP, XK_Up},
{KEYCODE_UP, XK_KP_Up},
{KEYCODE_DOWN, XK_Down},
{KEYCODE_DOWN, XK_KP_Down},
{KEYCODE_PAGEUP, XK_Page_Up},
{KEYCODE_PAGEUP, XK_KP_Prior},
{KEYCODE_PAGEUP, XK_KP_Page_Up},
{KEYCODE_PAGEDOWN, XK_Page_Down},
{KEYCODE_PAGEDOWN, XK_KP_Next},
{KEYCODE_PAGEDOWN, XK_KP_Page_Down},
{KEYCODE_INSERT, XK_Insert},
{KEYCODE_INSERT, XK_KP_Insert},
{KEYCODE_SELECT, XK_Select},
{KEYCODE_EXECUTE, XK_Execute},
{KEYCODE_HELP, XK_Help},
{KEYCODE_MENU, XK_Alt_L},
{KEYCODE_MENU, XK_Alt_R},
{KEYCODE_PAUSE, XK_Pause},
{KEYCODE_PRTSCRN, XK_Print},
{KEYCODE_CLEAR, XK_Clear},
{MOD_SCROLLLOCK, XK_Scroll_Lock},
{MOD_NUMLOCK, XK_Num_Lock},
{KEYCODE_F1, XK_KP_F1},
{KEYCODE_F1, XK_F1},
{KEYCODE_F2, XK_KP_F2},
{KEYCODE_F2, XK_F2},
{KEYCODE_F3, XK_KP_F3},
{KEYCODE_F3, XK_F3},
{KEYCODE_F4, XK_KP_F4},
{KEYCODE_F4, XK_F4},
{KEYCODE_F5, XK_F5},
{KEYCODE_F6, XK_F6},
{KEYCODE_F7, XK_F7},
{KEYCODE_F8, XK_F8},
{KEYCODE_F9, XK_F9},
{KEYCODE_F10, XK_F10},
{KEYCODE_F11, XK_F11},
{KEYCODE_F12, XK_F12},
{KEYCODE_F13, XK_F13},
{KEYCODE_F14, XK_F14},
{KEYCODE_F15, XK_F15},
{KEYCODE_F16, XK_F16},
{KEYCODE_F17, XK_F17},
{KEYCODE_F18, XK_F18},
{KEYCODE_F19, XK_F19},
{KEYCODE_F20, XK_F20},
{KEYCODE_F21, XK_F21},
{KEYCODE_F22, XK_F22},
{KEYCODE_F23, XK_F23},
{KEYCODE_F24, XK_F24},
};
#endif
/* Changes the case of a character. Based on US keyboard layout */
static const uint8_t g_caseswap[NPRTCHARS] =
{
ASCII_SPACE, ASCII_1, ASCII_RSQUOTE, ASCII_3, /* ! " # */
ASCII_4, ASCII_5, ASCII_7, ASCII_QUOTE, /* $ % & ' */
ASCII_9, ASCII_0, ASCII_8, ASCII_EQUAL, /* ( ) * + */
ASCII_LT, ASCII_UNDERSCORE, ASCII_GT, ASCII_QUESTION, /* , - . / */
ASCII_RPAREN, ASCII_EXCLAM, ASCII_AT, ASCII_NUMBER, /* 0 1 2 3 */
ASCII_DOLLAR, ASCII_PERCENT, ASCII_CIRCUMFLEX, ASCII_AMPERSAND, /* 4 5 6 7 */
ASCII_ASTERISK, ASCII_LPAREN, ASCII_SEMICOLON, ASCII_COLON, /* 8 9 : ; */
ASCII_COMMA, ASCII_PLUS, ASCII_PERIOD, ASCII_SLASH, /* < = > ? */
ASCII_2, ASCII_a, ASCII_b, ASCII_c, /* @ A B C */
ASCII_d, ASCII_e, ASCII_f, ASCII_g, /* D E F G */
ASCII_h, ASCII_i, ASCII_j, ASCII_k, /* H I J K */
ASCII_l, ASCII_m, ASCII_n, ASCII_o, /* L M N O */
ASCII_p, ASCII_q, ASCII_r, ASCII_s, /* P Q R S */
ASCII_t, ASCII_u, ASCII_v, ASCII_v, /* T U V W */
ASCII_x, ASCII_y, ASCII_z, ASCII_LBRACE, /* X Y Z [ */
ASCII_VERTBAR, ASCII_RBRACE, ASCII_6, ASCII_HYPHEN, /* \ ] ^ _ */
ASCII_TILDE, ASCII_A, ASCII_B, ASCII_C, /* ' a b c */
ASCII_D, ASCII_E, ASCII_F, ASCII_G, /* c e f g */
ASCII_H, ASCII_I, ASCII_J, ASCII_K, /* h i j k */
ASCII_L, ASCII_M, ASCII_N, ASCII_O, /* l m n o */
ASCII_P, ASCII_Q, ASCII_R, ASCII_S, /* p q r s */
ASCII_T, ASCII_U, ASCII_V, ASCII_W, /* t u v w */
ASCII_X, ASCII_Y, ASCII_Z, ASCII_LBRACKET, /* x y z { */
ASCII_BACKSLASH, ASCII_RBRACKET, ASCII_RSQUOTE, /* | } ~ */
};
/* State of each modifier */
static bool g_modstate[NMODIFIERS];
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: vnc_kbd_encode
*
* Description:
* Encode one escape sequence command into the proivded buffer.
*
* Input Parameters:
* buffer - The location to write the sequence
* keycode - The command to be added to the output stream.
* terminator - Escape sequence terminating character.
*
* Returned Value:
* Number of bytes written
*
****************************************************************************/
#ifdef CONFIG_VNCSERVER_KBDENCODE
static inline int vnc_kbd_encode(FAR uint8_t *buffer, uint8_t keycode,
uint8_t terminator)
{
*buffer++ = ASCII_ESC;
*buffer++ = ASCII_LBRACKET;
*buffer++ = keycode;
*buffer = terminator;
return 4;
}
#endif
/****************************************************************************
* Name: vnc_kbd_press
*
* Description:
* Indicates a normal key press event. Put one byte of normal keyboard
* data into the user provided buffer.
*
* Input Parameters:
* buffer - The location to write the sequence
* ch - The character to be added to the output stream.
*
* Returned Value:
* Number of bytes written
*
****************************************************************************/
#ifdef CONFIG_VNCSERVER_KBDENCODE
static inline void vnc_kbd_press(FAR uint8_t *buffer, uint8_t ch)
{
*buffer = ch;
return 1;
}
#endif
/****************************************************************************
* Name: vnc_kbd_release
*
* Description:
* Encode the release of a normal key.
*
* Input Parameters:
* buffer - The location to write the sequence
* ch - The character associated with the key that was releared.
*
* Returned Value:
* Number of bytes written
*
****************************************************************************/
#ifdef CONFIG_VNCSERVER_KBDENCODE
static inline void vnc_kbd_release(FAR uint8_t *buffer, uint8_t ch)
{
return vnc_kbd_encode(buffer, ch, ('a' + KBD_RELEASE));
}
#endif
/****************************************************************************
* Name: vnc_kbd_specpress
*
* Description:
* Denotes a special key press event. Put one special keyboard command
* into the user provided buffer.
*
* Input Parameters:
* buffer - The location to write the sequence
* keycode - The command to be added to the output stream.
*
* Returned Value:
* Number of bytes written
*
****************************************************************************/
#ifdef CONFIG_VNCSERVER_KBDENCODE
static inline void vnc_kbd_specpress(FAR uint8_t *buffer, uint8_t keycode)
{
return vnc_kbd_encode(buffer, keycode, stream, ('a' + KBD_SPECPRESS));
}
#endif
/****************************************************************************
* Name: vnc_kbd_specrel
*
* Description:
* Denotes a special key release event. Put one special keyboard
* command into the user provided buffer.
*
* Input Parameters:
* buffer - The location to write the sequence
* keycode - The command to be added to the output stream.
*
* Returned Value:
* Number of bytes written
*
****************************************************************************/
#ifdef CONFIG_VNCSERVER_KBDENCODE
static inline void vnc_kbd_specrel(FAR uint8_t *buffer, uint8_t keycode)
{
return vnc_kbd_encode(buffer, keycode, stream, ('a' + KBD_SPECREL));
}
#endif
/****************************************************************************
* Name: vnc_kbd_lookup
*
* Description:
* Attempt to map the X11 keycode by searching in a lookup table.
*
****************************************************************************/
static int vnc_kbd_lookup(FAR const struct vnc_keymap_s *table,
unsigned int nelem, uint16_t keysym)
{
int i;
/* First just try to map the virtual keycode using our lookup-table */
for (i = 0; i < nelem; i++)
{
if (table[i].x11code == keysym)
{
/* We have a match */
return (int)table[i].nxcode;
}
}
/* No match */
return -EINVAL;
}
/****************************************************************************
* Name: vnc_kbd_ascii
*
* Description:
* Attempt to map the X11 keycode into the corresponding ASCII code.
*
****************************************************************************/
static int vnc_kbd_ascii(uint16_t keysym)
{
/* ISO/IEC 8859-1 Latin1 matches C ASCII in this range: */
#ifdef CONFIG_VNCSERVER_KBDENCODE
if (keysym >= ASCII_SPACE && keysym < ASCII_DEL)
#else
if (keysym >= ASCII_SPACE && keysym <= ASCII_DEL)
#endif
{
return (int)keysym;
}
/* Perform a lookup to handler some special cases */
return vnc_kbd_lookup(g_asciimap, G_ASCIIMAP_NELEM, keysym);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: vnc_key_map
*
* Description:
* Map the receive X11 keysym into something understood by NuttX and route
* that through NX to the appropriate window.
*
* Input Parameters:
* session - An instance of the session structure allocated by
* vnc_create_session().
* keysym - The X11 keysym value (see include/nuttx/inputx11_keysymdef)
* keydown - True: Key pressed; False: Key released
*
* Returned Value:
* None
*
****************************************************************************/
void vnc_key_map(FAR struct vnc_session_s *session, uint16_t keysym,
bool keydown)
{
#ifdef CONFIG_VNCSERVER_KBDENCODE
uint8_t buffer[4]
int nch;
#else
uint8_t buffer;
#endif
int16_t keych;
/* Check for modifier keys */
keych = vnc_kbd_lookup(g_modifiers, G_MODIFIERS_NELEM, keysym);
if (keych >= 0)
{
g_modstate[keych] = keydown;
return;
}
#ifndef CONFIG_VNCSERVER_KBDENCODE
/* If we are not encoding key presses, then we have to ignore key release
* events.
*/
if (!keydown)
{
return;
}
#endif
/* If no external keyboard input handler has been provided, then we have to drop the keyboard input.
*/
if (session->kbdout == NULL)
{
return;
}
/* Try to convert the keycode to an ASCII value */
keych = vnc_kbd_ascii((char)(keysym & 255));
if (keych >= 0)
{
/* It is a simple ASCII-mappable LATIN1 character. Now we need
* to apply any modifiers.
*/
if (g_modstate[MOD_CONTROL])
{
/* Make into a control character */
keych &= 0x1f;
}
/* Other modifiers apply only to printable characters */
else if (ISPRINTABLE(keych))
{
/* If Shift Lock is selected, then the case of all printable
* characters should be reversed (unless the Shift key is also
* pressed)
*/
if (g_modstate[MOD_SHIFTLOCK])
{
if (g_modstate[MOD_SHIFT])
{
/* Swap case */
keych = g_caseswap[keych];
}
}
/* If Caps Lock is selected, then the case of alphabetic
* characters should be reversed (unless the Shift key is also
* pressed)
*/
else if (g_modstate[MOD_CAPSLOCK] && ISALPHABETIC(keych))
{
if (g_modstate[MOD_SHIFT])
{
/* Swap case */
keych = g_caseswap[keych];
}
}
/* If (1) only the Shift Key is pressed or (2) the Shift key is
* pressed with Caps Lock, but the character is not alphabetic,
* then the case of all printable characters should be reversed.
*/
else if (g_modstate[MOD_SHIFT])
{
keych = g_caseswap[keych];
}
}
#ifdef CONFIG_VNCSERVER_KBDENCODE
/* Encode the normal character */
if (keydown)
{
nch = vnc_kbd_press(buffer, keych);
}
else
{
nch = vnc_kbd_release(buffer, keych);
}
/* Inject the normal character sequence into NX */
session->kbdout(session->arg, nch, buffer);
#else
/* Inject the single key press into NX */
buffer = (uint8_t)keych;
session->kbdout(session->arg, 1, &buffer);
#endif
}
/* Not mappable to an ASCII LATIN1 character */
#ifdef CONFIG_VNCSERVER_KBDENCODE
else
{
/* Lookup cursor movement/screen control keysyms */
keych = vnc_kbd_lookup(g_modifiers, G_MODIFIERS_NELEM, keysym);
if (keych >= 0)
{
/* Encode the speical character */
if (keydown)
{
nch = vnc_kbd_specpress(buffer, keych);
}
else
{
nch = vnc_kbd_specrel(buffer, keych);
}
/* Inject the special character sequence into NX */
session->kbdout(session->arg, nch, buffer);
}
}
#endif
}
/****************************************************************************
* Name: vnc_kbdout
*
* Description:
* This is the default keyboard callout function. This is simply wrappers around nx_kdbout(), respectively. When configured using vnc_fbinitialize(), the 'arg' must be the correct NXHANDLE value.
*
* Input Parameters:
* arg - The NXHANDLE from the NX graphics subsystem
* nch - Number of characters
* ch - An array of input characters.
*
* Returned Value:
* None
*
****************************************************************************/
void vnc_kbdout(FAR void *arg, uint8_t nch, FAR const uint8_t *ch)
{
DEBUGASSERT(arg != NULL);
(void)nx_kbdin((NXHANDLE)arg, nch, ch);
}
#endif /* CONFIG_NX_KBD */
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