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xrdp/common/scancode.c

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/**
* Copyright (C) 2022 Matt Burt, all xrdp contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/**
* @file common/scancode.c
* @brief Scancode handling
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <stddef.h>
#include <string.h>
#include "scancode.h"
struct scancode_to_keycode
{
unsigned short scancode; // 0x1xx implies an extended key
unsigned char keycode;
};
#define ELEMENTS(x) (sizeof(x) / sizeof(x[0]))
// Sources:-
// file:/usr/share/X11/xkb/keycodes/evdev
// https://wiki.osdev.org/PS/2_Keyboard
// https://www.kbdlayout.info/
static const struct scancode_to_keycode
evdev_scancode_to_keycode_map[] =
{
// Virtual XKB
// Key (US) Symbol
// -------- ------
{ 0x001, 9 }, // VK_ESCAPE ESC
{ 0x002, 10 }, // VK_1 AE01
{ 0x003, 11 }, // VK_2 AE02
{ 0x004, 12 }, // VK_3 AE03
{ 0x005, 13 }, // VK_4 AE04
{ 0x006, 14 }, // VK_5 AE05
{ 0x007, 15 }, // VK_6 AE06
{ 0x008, 16 }, // VK_7 AE07
{ 0x009, 17 }, // VK_8 AE08
{ 0x00a, 18 }, // VK_9 AE09
{ 0x00b, 19 }, // VK_0 AE10
{ 0x00c, 20 }, // VK_OEM_MINUS AE11
{ 0x00d, 21 }, // VK_OEM_PLUS AE12
{ 0x00e, 22 }, // VK_BACK BKSP
{ 0x00f, 23 }, // VK_TAB TAB
{ 0x010, 24 }, // VK_Q AD01
{ 0x011, 25 }, // VK_W AD02
{ 0x012, 26 }, // VK_E AD03
{ 0x013, 27 }, // VK_R AD04
{ 0x014, 28 }, // VK_T AD05
{ 0x015, 29 }, // VK_Y AD06
{ 0x016, 30 }, // VK_U AD07
{ 0x017, 31 }, // VK_I AD08
{ 0x018, 32 }, // VK_O AD09
{ 0x019, 33 }, // VK_P AD10
{ 0x01a, 34 }, // VK_OEM_4 AD11
{ 0x01b, 35 }, // VK_OEM_6 AD12
{ 0x01c, 36 }, // VK_RETURN RTRN
{ 0x01d, 37 }, // VK_LCONTROL LCTL
{ 0x01e, 38 }, // VK_A AC01
{ 0x01f, 39 }, // VK_S AC02
{ 0x020, 40 }, // VK_D AC03
{ 0x021, 41 }, // VK_F AC04
{ 0x022, 42 }, // VK_G AC05
{ 0x023, 43 }, // VK_H AC06
{ 0x024, 44 }, // VK_J AC07
{ 0x025, 45 }, // VK_K AC08
{ 0x026, 46 }, // VK_L AC09
{ 0x027, 47 }, // VK_OEM_1 AC10
{ 0x028, 48 }, // VK_OEM_7 AC11
{ 0x029, 49 }, // VK_OEM_3 TLDE
{ 0x02a, 50 }, // VK_LSHIFT LFSH
{ 0x02b, 51 }, // VK_OEM_5 BKSL
{ 0x02c, 52 }, // VK_Z AB01
{ 0x02d, 53 }, // VK_X AB02
{ 0x02e, 54 }, // VK_C AB03
{ 0x02f, 55 }, // VK_V AB04
{ 0x030, 56 }, // VK_B AB05
{ 0x031, 57 }, // VK_N AB06
{ 0x032, 58 }, // VK_M AB07
{ 0x033, 59 }, // VK_OEM_COMMA AB08
{ 0x034, 60 }, // VK_OEM_PERIOD AB09
{ 0x035, 61 }, // VK_OEM_2 AB10
{ 0x036, 62 }, // VK_RSHIFT RTSH
{ 0x037, 63 }, // VK_MULTIPLY KPMU
{ 0x038, 64 }, // VK_LMENU LALT
{ 0x039, 65 }, // VK_SPACE SPCE
{ 0x03a, 66 }, // VK_CAPITAL CAPS
{ 0x03b, 67 }, // VK_F1 FK01
{ 0x03c, 68 }, // VK_F2 FK02
{ 0x03d, 69 }, // VK_F3 FK03
{ 0x03e, 70 }, // VK_F4 FK04
{ 0x03f, 71 }, // VK_F5 FK05
{ 0x040, 72 }, // VK_F6 FK06
{ 0x041, 73 }, // VK_F7 FK07
{ 0x042, 74 }, // VK_F8 FK08
{ 0x043, 75 }, // VK_F9 FK09
{ 0x044, 76 }, // VK_F10 FK10
{ 0x045, 77 }, // VK_NUMLOCK NMLK
{ 0x046, 78 }, // VK_SCROLL SCLK
{ 0x047, 79 }, // VK_HOME KP7
{ 0x048, 80 }, // VK_UP KP8
{ 0x049, 81 }, // VK_PRIOR KP9
{ 0x04a, 82 }, // VK_SUBTRACT KPSU
{ 0x04b, 83 }, // VK_LEFT KP4
{ 0x04c, 84 }, // VK_CLEAR KP5
{ 0x04d, 85 }, // VK_RIGHT KP6
{ 0x04e, 86 }, // VK_ADD KPAD
{ 0x04f, 87 }, // VK_END KP1
{ 0x050, 88 }, // VK_DOWN KP2
{ 0x051, 89 }, // VK_NEXT KP3
{ 0x052, 90 }, // VK_INSERT KP0
{ 0x053, 91 }, // VK_DELETE KPDL
{ 0x056, 94 }, // VK_OEM_102 LSGT
{ 0x057, 95 }, // VK_F11 FK11
{ 0x058, 96 }, // VK_F12 FK12
{ 0x070, 101 }, // - HKTG
{ 0x073, 97 }, // VK_ABNT_C1 AB11
{ 0x079, 100 }, // - HENK
{ 0x07b, 102 }, // VK_OEM_PA1 MUHE
{ 0x07d, 132 }, // - AE13
{ 0x07e, 129 }, // VK_ABNT_C2 KPPT (Brazil ABNT2)
{ 0x110, 173 }, // VK_MEDIA_PREV_TRACK I173 (KEY_PREVIOUSSONG)
{ 0x119, 171 }, // VK_MEDIA_NEXT_TRACK I171 (KEY_NEXTSONG)
{ 0x11c, 104 }, // VK_RETURN KPEN
{ 0x11d, 105 }, // VK_RCONTROL RCTL
{ 0x120, 121 }, // VK_VOLUME_MUTE MUTE
{ 0x121, 148 }, // VK_LAUNCH_APP2 I148 (KEY_CALC)
{ 0x122, 172 }, // VK_PLAY_PAUSE I172 (KEY_PLAYPAUSE)
{ 0x124, 174 }, // VK_MEDIA_STOP I174 (KEY_STOPCD)
{ 0x12e, 122 }, // VK_VOLUME_DOWN VOL-
{ 0x130, 123 }, // VK_VOLUME_UP VOL+
{ 0x132, 180 }, // VK_BROWSER_HOME I180 (KEY_HOMEPAGE)
{ 0x135, 106 }, // VK_DIVIDE KPDV
{ 0x137, 107 }, // VK_SNAPSHOT PRSC
{ 0x138, 108 }, // VK_RMENU RALT
{ 0x147, 110 }, // VK_HOME HOME
{ 0x148, 111 }, // VK_UP UP
{ 0x149, 112 }, // VK_PRIOR PGUP (KEY_COMPUTER)
{ 0x14b, 113 }, // VK_LEFT LEFT
{ 0x14d, 114 }, // VK_RIGHT RGHT
{ 0x14f, 115 }, // VK_END END
{ 0x150, 116 }, // VK_DOWN DOWN
{ 0x151, 117 }, // VK_NEXT PGDN
{ 0x152, 118 }, // VK_INSERT INS
{ 0x153, 119 }, // VK_DELETE DELE
{ 0x15b, 133 }, // VK_LWIN LWIN
{ 0x15c, 134 }, // VK_RWIN RWIN
{ 0x15d, 135 }, // VK_APPS COMP
{ 0x165, 225 }, // VK_BROWSER_SEARCH I225 (KEY_SEARCH)
{ 0x166, 164 }, // VK_BROWSER_FAVORITES I164 (KEY_BOOKMARKS)
{ 0x16b, 165 }, // VK_LAUNCH_APP1 I165 (KEY_COMPUTER)
{ 0x16c, 163 }, // VK_LAUNCH_MAIL I163 (KEY_MAIL)
{ 0x21d, 127 } // VK_PAUSE PAUS (KEY_PAUSE)
};
// Sources:-
// file:/usr/share/X11/xkb/keycodes/xfree86
// https://wiki.osdev.org/PS/2_Keyboard
// https://www.kbdlayout.info/
static const struct scancode_to_keycode
base_scancode_to_keycode_map[] =
{
// Virtual XKB
// Key (US) Symbol
// -------- ------
{ 0x001, 9 }, // VK_ESCAPE ESC
{ 0x002, 10 }, // VK_1 AE01
{ 0x003, 11 }, // VK_2 AE02
{ 0x004, 12 }, // VK_3 AE03
{ 0x005, 13 }, // VK_4 AE04
{ 0x006, 14 }, // VK_5 AE05
{ 0x007, 15 }, // VK_6 AE06
{ 0x008, 16 }, // VK_7 AE07
{ 0x009, 17 }, // VK_8 AE08
{ 0x00a, 18 }, // VK_9 AE09
{ 0x00b, 19 }, // VK_0 AE10
{ 0x00c, 20 }, // VK_OEM_MINUS AE11
{ 0x00d, 21 }, // VK_OEM_PLUS AE12
{ 0x00e, 22 }, // VK_BACK BKSP
{ 0x00f, 23 }, // VK_TAB TAB
{ 0x010, 24 }, // VK_Q AD01
{ 0x011, 25 }, // VK_W AD02
{ 0x012, 26 }, // VK_E AD03
{ 0x013, 27 }, // VK_R AD04
{ 0x014, 28 }, // VK_T AD05
{ 0x015, 29 }, // VK_Y AD06
{ 0x016, 30 }, // VK_U AD07
{ 0x017, 31 }, // VK_I AD08
{ 0x018, 32 }, // VK_O AD09
{ 0x019, 33 }, // VK_P AD10
{ 0x01a, 34 }, // VK_OEM_4 AD11
{ 0x01b, 35 }, // VK_OEM_6 AD12
{ 0x01c, 36 }, // VK_RETURN RTRN
{ 0x01d, 37 }, // VK_LCONTROL LCTL
{ 0x01e, 38 }, // VK_A AC01
{ 0x01f, 39 }, // VK_S AC02
{ 0x020, 40 }, // VK_D AC03
{ 0x021, 41 }, // VK_F AC04
{ 0x022, 42 }, // VK_G AC05
{ 0x023, 43 }, // VK_H AC06
{ 0x024, 44 }, // VK_J AC07
{ 0x025, 45 }, // VK_K AC08
{ 0x026, 46 }, // VK_L AC09
{ 0x027, 47 }, // VK_OEM_1 AC10
{ 0x028, 48 }, // VK_OEM_7 AC11
{ 0x029, 49 }, // VK_OEM_3 TLDE
{ 0x02a, 50 }, // VK_LSHIFT LFSH
{ 0x02b, 51 }, // VK_OEM_5 BKSL
{ 0x02c, 52 }, // VK_Z AB01
{ 0x02d, 53 }, // VK_X AB02
{ 0x02e, 54 }, // VK_C AB03
{ 0x02f, 55 }, // VK_V AB04
{ 0x030, 56 }, // VK_B AB05
{ 0x031, 57 }, // VK_N AB06
{ 0x032, 58 }, // VK_M AB07
{ 0x033, 59 }, // VK_OEM_COMMA AB08
{ 0x034, 60 }, // VK_OEM_PERIOD AB09
{ 0x035, 61 }, // VK_OEM_2 AB10
{ 0x036, 62 }, // VK_RSHIFT RTSH
{ 0x037, 63 }, // VK_MULTIPLY KPMU
{ 0x038, 64 }, // VK_LMENU LALT
{ 0x039, 65 }, // VK_SPACE SPCE
{ 0x03a, 66 }, // VK_CAPITAL CAPS
{ 0x03b, 67 }, // VK_F1 FK01
{ 0x03c, 68 }, // VK_F2 FK02
{ 0x03d, 69 }, // VK_F3 FK03
{ 0x03e, 70 }, // VK_F4 FK04
{ 0x03f, 71 }, // VK_F5 FK05
{ 0x040, 72 }, // VK_F6 FK06
{ 0x041, 73 }, // VK_F7 FK07
{ 0x042, 74 }, // VK_F8 FK08
{ 0x043, 75 }, // VK_F9 FK09
{ 0x044, 76 }, // VK_F10 FK10
{ 0x045, 77 }, // VK_NUMLOCK NMLK
{ 0x046, 78 }, // VK_SCROLL SCLK
{ 0x047, 79 }, // VK_HOME KP7
{ 0x048, 80 }, // VK_UP KP8
{ 0x049, 81 }, // VK_PRIOR KP9
{ 0x04a, 82 }, // VK_SUBTRACT KPSU
{ 0x04b, 83 }, // VK_LEFT KP4
{ 0x04c, 84 }, // VK_CLEAR KP5
{ 0x04d, 85 }, // VK_RIGHT KP6
{ 0x04e, 86 }, // VK_ADD KPAD
{ 0x04f, 87 }, // VK_END KP1
{ 0x050, 88 }, // VK_DOWN KP2
{ 0x051, 89 }, // VK_NEXT KP3
{ 0x052, 90 }, // VK_INSERT KP0
{ 0x053, 91 }, // VK_DELETE KPDL
{ 0x056, 94 }, // VK_OEM_102 LSGT
{ 0x057, 95 }, // VK_F11 FK11
{ 0x058, 96 }, // VK_F12 FK12
{ 0x070, 208 }, // - HKTG
{ 0x073, 211 }, // VK_ABNT_C1 AB11
{ 0x079, 129 }, // - XFER
{ 0x07b, 131 }, // VK_OEM_PA1 NFER
{ 0x07d, 133 }, // - AE13
{ 0x07e, 134 }, // VK_ABNT_C2 KPPT (Brazil ABNT2)
{ 0x11c, 108 }, // VK_RETURN KPEN
{ 0x11d, 109 }, // VK_RCONTROL RCTL
{ 0x120, 141 }, // VK_VOLUME_MUTE MUTE
{ 0x12e, 142 }, // VK_VOLUME_DOWN VOL-
{ 0x130, 143 }, // VK_VOLUME_UP VOL+
{ 0x135, 112 }, // VK_DIVIDE KPDV
{ 0x137, 121 }, // VK_SNAPSHOT PRSC
{ 0x138, 113 }, // VK_RMENU RALT
{ 0x147, 97 }, // VK_HOME HOME
{ 0x148, 98 }, // VK_UP UP
{ 0x149, 99 }, // VK_PRIOR PGUP (KEY_COMPUTER)
{ 0x14b, 100 }, // VK_LEFT LEFT
{ 0x14d, 102 }, // VK_RIGHT RGHT
{ 0x14f, 103 }, // VK_END END
{ 0x150, 104 }, // VK_DOWN DOWN
{ 0x151, 105 }, // VK_NEXT PGDN
{ 0x152, 106 }, // VK_INSERT INS
{ 0x153, 107 }, // VK_DELETE DELE
{ 0x15b, 115 }, // VK_LWIN LWIN
{ 0x15c, 116 }, // VK_RWIN RWIN
{ 0x15d, 117 }, // VK_APPS COMP
{ 0x21d, 110 } // VK_PAUSE PAUS (KEY_PAUSE)
};
struct map_settings
{
const struct scancode_to_keycode *map;
const char *name;
unsigned int size;
};
enum settings_index
{
SI_EVDEV = 0,
SI_BASE
};
const struct map_settings global_settings[] =
{
{
// SI_EVDEV
.map = evdev_scancode_to_keycode_map,
.name = "evdev",
.size = ELEMENTS(evdev_scancode_to_keycode_map),
},
{
// SI_BASE
.map = base_scancode_to_keycode_map,
.name = "base",
.size = ELEMENTS(base_scancode_to_keycode_map)
}
};
// Default mapping set is "evdev"
const struct map_settings *settings = &global_settings[SI_EVDEV];
/*****************************************************************************/
int
scancode_to_index(unsigned short scancode)
{
if (scancode <= 0x7f)
{
return scancode;
}
if (scancode <= 0xff)
{
// 0x80 - 0xff : Invalid code
return -1;
}
if (scancode <= 0x177)
{
// 01x100 - 0x177 : Move bit 9 to bit 8
return (scancode & 0x7f) | 0x80;
}
if (scancode == SCANCODE_PAUSE_KEY)
{
return SCANCODE_INDEX_PAUSE_KEY;
}
// This leaves the following which are all rejected
// 0x178 - 0x17f (currently unused). These would map to indexes 0xf8
// to 0xff which we are reserving for extended1 keys.
// 0x180 - 0x1ff Illegal format
// >0x200 Anything not mentioned explicitly above (e.g.
// SCANCODE_PAUSE_KEY)
return -1;
}
/*****************************************************************************/
unsigned short
scancode_from_index(int index)
{
index &= 0xff;
unsigned short result;
if (index == SCANCODE_INDEX_PAUSE_KEY)
{
result = SCANCODE_PAUSE_KEY;
}
else if (index < 0x80)
{
result = index;
}
else
{
result = (index & 0x7f) | 0x100;
}
return result;
}
/*****************************************************************************/
unsigned short
scancode_to_x11_keycode(unsigned short scancode)
{
unsigned int min = 0;
unsigned int max = settings->size;
unsigned short rv = 0;
// Check scancode is in range of map
if (scancode >= settings->map[min].scancode &&
scancode <= settings->map[max - 1].scancode)
{
// Use a binary chop to locate the correct index
// in logarithmic time.
while (1)
{
unsigned int index = (min + max) / 2;
if (scancode == settings->map[index].scancode)
{
rv = settings->map[index].keycode;
break;
}
// Adjust min or max, checking for end
// of iteration
if (scancode < settings->map[index].scancode)
{
max = index;
}
else if (min == index)
{
// We've already checked this value
break;
}
else
{
min = index;
}
}
}
return rv;
}
/*****************************************************************************/
unsigned short
scancode_get_next(unsigned int *iter)
{
unsigned short rv = 0;
if (*iter < settings->size)
{
rv = settings->map[*iter].scancode;
++(*iter);
}
return rv;
}
/*****************************************************************************/
int
scancode_set_keycode_set(const char *kk_set)
{
int rv = 0;
if (kk_set == NULL)
{
rv = 1;
}
else if (strncmp(kk_set, "evdev", 5) == 0)
{
settings = &global_settings[SI_EVDEV];
}
else if (strncmp(kk_set, "base", 4) == 0)
{
settings = &global_settings[SI_BASE];
}
else if (strncmp(kk_set, "xfree86", 7) == 0)
{
settings = &global_settings[SI_BASE];
}
else
{
rv = 1;
}
return rv;
}
/*****************************************************************************/
const char *
scancode_get_keycode_set(void)
{
return settings->name;
}
/*****************************************************************************/
const char *
scancode_get_xkb_rules(void)
{
// Currently supported keycods map directly to the same name for
// the rules which use them.
return settings->name;
}
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