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GUACAMOLE-352: Merge clean up keymap lookup/update logic for the sake of verifiability.

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This commit is contained in:
Nick Couchman 2018-01-29 12:13:21 -05:00
commit c543adddb2
3 changed files with 169 additions and 87 deletions
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130
src/protocols/rdp/keyboard.c
View File

@ -187,6 +187,75 @@ static void guac_rdp_send_synchronize_event(guac_rdp_client* rdp_client,
}
/**
* Given a keyboard instance and X11 keysym, returns a pointer to the key
* structure that represents or can represent the key having that keysym within
* the keyboard, regardless of whether the key is currently defined. If no such
* key can exist (the keysym cannot be mapped or is out of range), NULL is
* returned.
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*
* @param keysym
* The keysym of the key to lookup within the given keyboard.
*
* @return
* A pointer to the guac_rdp_key structure which represents or can
* represent the key having the given keysym, or NULL if no such keysym can
* be defined within a guac_rdp_keyboard structure.
*/
static guac_rdp_key* guac_rdp_keyboard_map_key(guac_rdp_keyboard* keyboard,
int keysym) {
int index;
/* Map keysyms between 0x0000 and 0xFFFF directly */
if (keysym >= 0x0000 && keysym <= 0xFFFF)
index = keysym;
/* Map all Unicode keysyms from U+0000 to U+FFFF */
else if (keysym >= 0x1000000 && keysym <= 0x100FFFF)
index = 0x10000 + (keysym & 0xFFFF);
/* All other keysyms are unmapped */
else
return NULL;
/* Corresponding key mapping (defined or not) has been located */
return &(keyboard->keys[index]);
}
/**
* Returns a pointer to the guac_rdp_key structure representing the definition
* and state of the key having the given keysym. If no such key is defined
* within the keyboard layout of the RDP server, NULL is returned.
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
*
* @param keysym
* The keysym of the key to lookup within the given keyboard.
*
* @return
* A pointer to the guac_rdp_key structure representing the definition and
* state of the key having the given keysym, or NULL if no such key is
* defined within the keyboard layout of the RDP server.
*/
static guac_rdp_key* guac_rdp_keyboard_get_key(guac_rdp_keyboard* keyboard,
int keysym) {
/* Verify that the key is actually defined */
guac_rdp_key* key = guac_rdp_keyboard_map_key(keyboard, keysym);
if (key == NULL || key->definition == NULL)
return NULL;
/* Key is defined within keyboard */
return key;
}
/**
* Loads all keysym/scancode mappings declared within the given keymap and its
* parent keymap, if any. These mappings are stored within the given
@ -218,8 +287,16 @@ static void __guac_rdp_keyboard_load_keymap(guac_rdp_keyboard* keyboard,
/* Load mapping into keymap */
while (mapping->keysym != 0) {
/* Copy mapping */
GUAC_RDP_KEYSYM_LOOKUP(keyboard->keymap, mapping->keysym) = *mapping;
/* Locate corresponding key definition within keyboard */
guac_rdp_key* key = guac_rdp_keyboard_map_key(keyboard,
mapping->keysym);
/* Copy mapping (if key is mappable) */
if (key != NULL)
key->definition = mapping;
else
guac_client_log(keyboard->client, GUAC_LOG_DEBUG,
"Ignoring unmappable keysym 0x%X", mapping->keysym);
/* Next keysym */
mapping++;
@ -247,16 +324,8 @@ void guac_rdp_keyboard_free(guac_rdp_keyboard* keyboard) {
int guac_rdp_keyboard_is_defined(guac_rdp_keyboard* keyboard, int keysym) {
/* Verify keysym can actually be stored within keymap */
if (!GUAC_RDP_KEYSYM_STORABLE(keysym))
return 0;
/* Look up scancode mapping */
const guac_rdp_keysym_desc* keysym_desc =
&GUAC_RDP_KEYSYM_LOOKUP(keyboard->keymap, keysym);
/* Return whether the mapping actually exists */
return keysym_desc->scancode != 0;
return guac_rdp_keyboard_get_key(keyboard, keysym) != NULL;
}
@ -266,12 +335,12 @@ int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
guac_client* client = keyboard->client;
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
/* If keysym can be in lookup table */
if (GUAC_RDP_KEYSYM_STORABLE(keysym)) {
/* If keysym is actually defined within keyboard */
guac_rdp_key* key = guac_rdp_keyboard_get_key(keyboard, keysym);
if (key != NULL) {
/* Look up scancode mapping */
const guac_rdp_keysym_desc* keysym_desc =
&GUAC_RDP_KEYSYM_LOOKUP(keyboard->keymap, keysym);
const guac_rdp_keysym_desc* keysym_desc = key->definition;
/* If defined, send event */
if (keysym_desc->scancode != 0) {
@ -284,12 +353,16 @@ int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
/* If defined, send any prerequesite keys that must be set */
if (keysym_desc->set_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->set_keysyms, 0, 1);
keysym_desc->set_keysyms,
GUAC_RDP_KEY_RELEASED,
GUAC_RDP_KEY_PRESSED);
/* If defined, release any keys that must be cleared */
if (keysym_desc->clear_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->clear_keysyms, 1, 0);
keysym_desc->clear_keysyms,
GUAC_RDP_KEY_PRESSED,
GUAC_RDP_KEY_RELEASED);
/* Fire actual key event for target key */
guac_rdp_send_key_event(rdp_client, keysym_desc->scancode,
@ -298,12 +371,16 @@ int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
/* If defined, release any keys that were originally released */
if (keysym_desc->set_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->set_keysyms, 0, 0);
keysym_desc->set_keysyms,
GUAC_RDP_KEY_RELEASED,
GUAC_RDP_KEY_RELEASED);
/* If defined, send any keys that were originally set */
if (keysym_desc->clear_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->clear_keysyms, 1, 1);
keysym_desc->clear_keysyms,
GUAC_RDP_KEY_PRESSED,
GUAC_RDP_KEY_PRESSED);
return 0;
@ -344,20 +421,18 @@ int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
}
void guac_rdp_keyboard_send_events(guac_rdp_keyboard* keyboard,
const int* keysym_string, int from, int to) {
const int* keysym_string, guac_rdp_key_state from,
guac_rdp_key_state to) {
int keysym;
/* Send all keysyms in string, NULL terminated */
while ((keysym = *keysym_string) != 0) {
/* Get current keysym state */
int current_state =
GUAC_RDP_KEYSYM_LOOKUP(keyboard->keysym_state, keysym);
/* If key is currently in given state, send event for changing it to
* specified "to" state */
if (current_state == from)
guac_rdp_key* key = guac_rdp_keyboard_get_key(keyboard, keysym);
if (key != NULL && key->state == from)
guac_rdp_keyboard_send_event(keyboard, *keysym_string, to);
/* Next keysym */
@ -404,8 +479,9 @@ int guac_rdp_keyboard_update_keysym(guac_rdp_keyboard* keyboard,
keyboard->lock_flags ^= guac_rdp_keyboard_lock_flag(keysym);
/* Update keysym state */
if (GUAC_RDP_KEYSYM_STORABLE(keysym))
GUAC_RDP_KEYSYM_LOOKUP(keyboard->keysym_state, keysym) = pressed;
guac_rdp_key* key = guac_rdp_keyboard_get_key(keyboard, keysym);
if (key != NULL)
key->state = pressed ? GUAC_RDP_KEY_PRESSED : GUAC_RDP_KEY_RELEASED;
return guac_rdp_keyboard_send_event(keyboard, keysym, pressed);

85
src/protocols/rdp/keyboard.h
View File

@ -24,6 +24,50 @@
#include <guacamole/client.h>
/**
* The current local state of a key - either pressed or released.
*/
typedef enum guac_rdp_key_state {
/**
* The state associated with a key that is released (not currently
* pressed / held down).
*/
GUAC_RDP_KEY_RELEASED = 0,
/**
* The state associated with a key that is currently pressed (held down).
*/
GUAC_RDP_KEY_PRESSED = 1
} guac_rdp_key_state;
/**
* 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 {
/**
* The definition of this key within the RDP server's keymap (keyboard
* layout). This 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. If this key does not exist within the RDP server's keymap, this
* will be NULL.
*/
const guac_rdp_keysym_desc* definition;
/**
* The local state of this key. For the sake of simplicity, it is assumed
* that this state is also an accurate representation of the remote state
* of this key within the RDP session.
*/
guac_rdp_key_state state;
} guac_rdp_key;
/**
* The current keyboard state of an RDP session.
*/
@ -49,18 +93,19 @@ typedef struct guac_rdp_keyboard {
int synchronized;
/**
* The keymap to use when translating keysyms into scancodes or sequences
* of scancodes for RDP.
* 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.
*
* 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_static_keymap keymap;
/**
* The local state of all keys, based on whether Guacamole key events for
* pressing/releasing particular keysyms have been received. This is used
* together with the associated keymap to determine the sequence of RDP key
* events sent to duplicate the effect of a particular keysym.
*/
guac_rdp_keysym_state_map keysym_state;
guac_rdp_key keys[0x20000];
} guac_rdp_keyboard;
@ -136,9 +181,8 @@ int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
* For every keysym in the given NULL-terminated array of keysyms, send the RDP
* key events required to update the remote state of those keys as specified,
* depending on the current local state of those keysyms. For each key in the
* "from" state (0 being released and 1 being pressed), that key will be
* updated to the "to" state. The locally-stored state of each key is remains
* untouched.
* "from" state, that key will be updated to the "to" state. The locally-stored
* state of each key is remains untouched.
*
* @param keyboard
* The guac_rdp_keyboard associated with the current RDP session.
@ -147,15 +191,18 @@ int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
* A NULL-terminated array of keysyms, each of which will be updated.
*
* @param from
* 0 if the state of currently-released keys should be updated, or 1 if
* the state of currently-pressed keys should be updated.
* GUAC_RDP_KEY_RELEASED if the state of currently-released keys should be
* updated, or GUAC_RDP_KEY_PRESSED if the state of currently-pressed keys
* should be updated.
*
* @param to
* 0 if the keys being updated should be marked as released, or 1 if
* the keys being updated should be marked as pressed.
* GUAC_RDP_KEY_RELEASED if the keys being updated should be marked as
* released, or GUAC_RDP_KEY_PRESSED if the keys being updated should be
* marked as pressed.
*/
void guac_rdp_keyboard_send_events(guac_rdp_keyboard* keyboard,
const int* keysym_string, int from, int to);
const int* keysym_string, guac_rdp_key_state from,
guac_rdp_key_state to);
/**
* Updates the local state of the lock keys (such as Caps lock or Num lock),

41
src/protocols/rdp/rdp_keymap.h
View File

@ -112,47 +112,6 @@ struct guac_rdp_keymap {
};
/**
* Static mapping from keysyms to scancodes.
*/
typedef guac_rdp_keysym_desc guac_rdp_static_keymap[0x200][0x100];
/**
* Mapping from keysym to current state
*/
typedef int guac_rdp_keysym_state_map[0x200][0x100];
/**
* Simple macro for determing whether a keysym can be stored (or retrieved)
* from any keymap.
*
* @param keysym
* The keysym to check.
*
* @return
* Non-zero if the keysym can be stored or retrieved, zero otherwise.
*/
#define GUAC_RDP_KEYSYM_STORABLE(keysym) ((keysym) <= 0xFFFF || ((keysym) & 0xFFFF0000) == 0x01000000)
/**
* Simple macro for referencing the mapped value of a scancode for a given
* keysym. The idea here is that a keysym of the form 0xABCD will map to
* mapping[0xAB][0xCD] while a keysym of the form 0x100ABCD will map to
* mapping[0x1AB][0xCD].
*
* @param keysym_mapping
* A 512-entry array of 256-entry arrays of arbitrary values, where the
* location of each array and value is determined by the given keysym.
*
* @param keysym
* The keysym of the entry to look up.
*/
#define GUAC_RDP_KEYSYM_LOOKUP(keysym_mapping, keysym) ( \
(keysym_mapping) \
[(((keysym) & 0xFF00) >> 8) | ((keysym) >> 16)] \
[(keysym) & 0xFF] \
)
/**
* The name of the default keymap, which MUST exist.
*/