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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
#ifndef GUAC_RDP_KEYBOARD_H
#define GUAC_RDP_KEYBOARD_H
#include "keymap.h"
#include <freerdp/freerdp.h>
#include <guacamole/client.h>
/**
* The maximum number of distinct keysyms that any particular keyboard may support.
*/
#define GUAC_RDP_KEYBOARD_MAX_KEYSYMS 1024
/**
* The maximum number of unique modifier variations that any particular keysym
* may define. For example, on a US English keyboard, an uppercase "A" may be
* typed by pressing Shift+A with Caps Lock unset, or by pressing A with Caps
* Lock set (two variations).
*/
#define GUAC_RDP_KEY_MAX_DEFINITIONS 4
/**
* All possible sources of RDP key events tracked by guac_rdp_keyboard.
*/
typedef enum guac_rdp_key_source {
/**
* The key event was received directly from the Guacamole client via a
* "key" instruction.
*/
GUAC_RDP_KEY_SOURCE_CLIENT = 0,
/**
* The key event is being synthesized internally within the RDP support.
*/
GUAC_RDP_KEY_SOURCE_SYNTHETIC = 1
} guac_rdp_key_source;
/**
* A representation of a single key within the overall local keyboard,
* including the definition of that key within the RDP server's keymap and
* whether the key is currently pressed locally.
*/
typedef struct guac_rdp_key {
/**
* All definitions of this key within the RDP server's keymap (keyboard
* layout). Each definition describes which scancode corresponds to this
* key from the perspective of the RDP server, as well as which other
* scancodes must be pressed/released for this key to have the desired
* meaning.
*/
const guac_rdp_keysym_desc* definitions[GUAC_RDP_KEY_MAX_DEFINITIONS];
/**
* The number of definitions within the definitions array. If this key does
* not exist within the RDP server's keymap, this will be 0.
*/
int num_definitions;
/**
* The definition of this key that is currently pressed. If this key is not
* currently pressed, this will be NULL.
*/
const guac_rdp_keysym_desc* pressed;
/**
* Whether this key is currently pressed by the user, and is included among
* the total tracked by user_pressed_keys within guac_rdp_keyboard.
*/
int user_pressed;
} guac_rdp_key;
/**
* The current keyboard state of an RDP session.
*/
typedef struct guac_rdp_keyboard {
/**
* The guac_client associated with the RDP session whose keyboard state is
* being managed by this guac_rdp_keyboard.
*/
guac_client* client;
/**
* The local state of all known lock keys, as a bitwise OR of all RDP lock
* key flags. Legal flags are KBD_SYNC_SCROLL_LOCK, KBD_SYNC_NUM_LOCK,
* KBD_SYNC_CAPS_LOCK, and KBD_SYNC_KANA_LOCK.
*/
UINT32 lock_flags;
/**
* Whether the states of remote lock keys (Caps lock, Num lock, etc.) have
* been synchronized with local lock key states.
*/
int synchronized;
/**
* The number of keys stored within the keys array.
*/
unsigned int num_keys;
/**
* The local state of all keys, as well as the necessary information to
* translate received keysyms into scancodes or sequences of scancodes for
* RDP. The state of each key is updated based on received Guacamole key
* events, while the information describing the behavior and scancode
* mapping of each key is populated based on an associated keymap.
*
* Keys within this array are in arbitrary order.
*/
guac_rdp_key keys[GUAC_RDP_KEYBOARD_MAX_KEYSYMS];
/**
* Lookup table into the overall keys array, locating the guac_rdp_key
* associated with any particular keysym. If a keysym has no corresponding
* guac_rdp_key within the keys array, its entry within this lookuptable
* will be NULL.
*
* The index of the key for a given keysym is determined based on a
* simple transformation of the keysym itself. Keysyms between 0x0000 and
* 0xFFFF inclusive are mapped to 0x00000 through 0x0FFFF, while keysyms
* between 0x1000000 and 0x100FFFF inclusive (keysyms which are derived
* from Unicode) are mapped to 0x10000 through 0x1FFFF.
*/
guac_rdp_key* keys_by_keysym[0x20000];
/**
* The total number of keys that the user of the connection is currently
* holding down. This value indicates only the client-side keyboard state.
* It DOES NOT indicate the number of keys currently pressed within the RDP
* server.
*/
int user_pressed_keys;
} guac_rdp_keyboard;
/**
* Allocates a new guac_rdp_keyboard which manages the keyboard state of the
* RDP session associated with the given guac_client. Keyboard events will be
* dynamically translated from keysym to RDP scancode according to the provided
* keymap. The returned guac_rdp_keyboard must eventually be freed with
* guac_rdp_keyboard_free().
*
* @param client
* The guac_client associated with the RDP session whose keyboard state is
* to be managed by the newly-allocated guac_rdp_keyboard.
*
* @param keymap
* The keymap which should be used to translate keyboard events.
*
* @return
* A newly-allocated guac_rdp_keyboard which manages the keyboard state
* for the RDP session associated given guac_client.
*/
guac_rdp_keyboard* guac_rdp_keyboard_alloc(guac_client* client,
const guac_rdp_keymap* keymap);
/**
* Frees all memory allocated for the given guac_rdp_keyboard. The
* guac_rdp_keyboard must have been previously allocated via
* guac_rdp_keyboard_alloc().
*
* @param keyboard
* The guac_rdp_keyboard instance which should be freed.
*/
void guac_rdp_keyboard_free(guac_rdp_keyboard* keyboard);
/**
* Returns whether the given keysym is defined for the keyboard layout
* associated with the given keyboard.
*
* @param keyboard
* The guac_rdp_keyboard instance to check.
*
* @param keysym
* The keysym of the key being checked against the keyboard layout of the
* given keyboard.
*
* @return
* Non-zero if the key is explicitly defined within the keyboard layout of
* the given keyboard, zero otherwise.
*/
int guac_rdp_keyboard_is_defined(guac_rdp_keyboard* keyboard, int keysym);
/**
* Returns whether the key having the given keysym is currently pressed.
*
* @param keyboard
* The guac_rdp_keyboard instance to check.
*
* @param keysym
* The keysym of the key being checked.
*
* @return
* Non-zero if the key is currently pressed, zero otherwise.
*/
int guac_rdp_keyboard_is_pressed(guac_rdp_keyboard* keyboard, int keysym);
/**
* Returns the local state of all known modifier keys, as a bitwise OR of the
* modifier flags used by the keymaps. Alternative methods of producing the
* effect of certain modifiers, such as holding Ctrl+Alt for AltGr when a
* dedicated AltGr key is unavailable, are taken into account.
*
* @see GUAC_RDP_KEYMAP_MODIFIER_SHIFT
* @see GUAC_RDP_KEYMAP_MODIFIER_ALTGR
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*
* @return
* The local state of all known modifier keys.
*/
unsigned int guac_rdp_keyboard_get_modifier_flags(guac_rdp_keyboard* keyboard);
/**
* Updates the local state of the lock keys (such as Caps lock or Num lock),
* synchronizing the remote state of those keys if it is expected to differ.
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*
* @param set_flags
* The lock key flags which should be set. Legal flags are
* KBD_SYNC_SCROLL_LOCK, KBD_SYNC_NUM_LOCK, KBD_SYNC_CAPS_LOCK, and
* KBD_SYNC_KANA_LOCK.
*
* @param clear_flags
* The lock key flags which should be cleared. Legal flags are
* KBD_SYNC_SCROLL_LOCK, KBD_SYNC_NUM_LOCK, KBD_SYNC_CAPS_LOCK, and
* KBD_SYNC_KANA_LOCK.
*/
void guac_rdp_keyboard_update_locks(guac_rdp_keyboard* keyboard,
unsigned int set_flags, unsigned int clear_flags);
/**
* Updates the local state of the modifier keys (such as Shift or AltGr),
* synchronizing the remote state of those keys if it is expected to differ.
* Valid modifier flags are defined by keymap.h.
*
* @see GUAC_RDP_KEYMAP_MODIFIER_SHIFT
* @see GUAC_RDP_KEYMAP_MODIFIER_ALTGR
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*
* @param set_flags
* The modifier key flags which should be set.
*
* @param clear_flags
* The modifier key flags which should be cleared.
*/
void guac_rdp_keyboard_update_modifiers(guac_rdp_keyboard* keyboard,
unsigned int set_flags, unsigned int clear_flags);
/**
* Updates the local state of the given keysym, sending the key events required
* to replicate that state remotely (on the RDP server). The key events sent
* will depend on the current keymap.
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*
* @param keysym
* The keysym being pressed or released.
*
* @param pressed
* Zero if the keysym is being released, non-zero otherwise.
*
* @param source
* The source of the key event represented by this call to
* guac_rdp_keyboard_update_keysym().
*
* @return
* Zero if the keys were successfully sent, non-zero otherwise.
*/
int guac_rdp_keyboard_update_keysym(guac_rdp_keyboard* keyboard,
int keysym, int pressed, guac_rdp_key_source source);
/**
* Releases all currently pressed keys, sending key release events to the RDP
* server as necessary. Lock states (Caps Lock, etc.) are not affected.
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*/
void guac_rdp_keyboard_reset(guac_rdp_keyboard* keyboard);
/**
* Callback which is invoked by FreeRDP when the RDP server reports changes to
* keyboard lock status using a Server Set Keyboard Indicators PDU.
*
* @param context
* The rdpContext associated with the current RDP session.
*
* @param flags
* The remote state of all lock keys, as a bitwise OR of all RDP lock key
* flags. Legal flags are KBD_SYNC_SCROLL_LOCK, KBD_SYNC_NUM_LOCK,
* KBD_SYNC_CAPS_LOCK, and KBD_SYNC_KANA_LOCK.
*
* @return
* TRUE if successful, FALSE otherwise.
*/
BOOL guac_rdp_keyboard_set_indicators(rdpContext* context, UINT16 flags);
#endif