android/charmap.h

/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
*/
#ifndef _android_charmap_h
#define _android_charmap_h

#include "android/keycode.h"
#include "android/keycode-array.h"

/* this defines a structure used to describe an Android keyboard charmap */
typedef struct AKeyEntry {
    unsigned short  code;
    unsigned short  base;
    unsigned short  caps;
    unsigned short  fn;
    unsigned short  caps_fn;
    unsigned short  number;
} AKeyEntry;

/* Defines size of name buffer in AKeyCharmap entry. */
#define AKEYCHARMAP_NAME_SIZE   32

typedef struct AKeyCharmap {
    const AKeyEntry*  entries;
    int               num_entries;
    char              name[ AKEYCHARMAP_NAME_SIZE ];
} AKeyCharmap;

/* Extracts charmap name from .kcm file name.
 * Charmap name, extracted by this routine is a name of the kcm file, trimmed
 * of file name extension, and shrinked (if necessary) to fit into the name
 * buffer. Here are examples on how this routine extracts charmap name:
 * /a/path/to/kcmfile.kcm       -> kcmfile
 * /a/path/to/kcmfile.ext.kcm   -> kcmfile.ext
 * /a/path/to/kcmfile           -> kcmfile
 * /a/path/to/.kcmfile          -> kcmfile
 * /a/path/to/.kcmfile.kcm      -> .kcmfile
 * kcm_file_path - Path to key charmap file to extract charmap name from.
 * charmap_name - Buffer, where to save extracted charname.
 * max_len - charmap_name buffer size.
*/
void kcm_extract_charmap_name(const char* kcm_file_path,
                              char* charmap_name,
                              int max_len);

/* Gets a pointer to the default hard-coded charmap */
const AKeyCharmap* android_get_default_charmap(void);

/* Parse a charmap file and add it to our list.
 * Key charmap array always contains two maps: one for qwerty, and
 * another for qwerty2 keyboard layout. However, a custom layout can
 * be requested with -charmap option. In tha case kcm_file_path
 * parameter contains path to a .kcm file that defines that custom
 * layout, and as the result, key charmap array will contain another
 * entry built from that file. If -charmap option was not specified,
 * kcm_file_path is NULL and final key charmap array will contain only
 * two default entries.
 * Returns a zero value on success, or -1 on failure.
 *
 * Note: on success, the charmap will be returned by android_get_charmap()
 */
int android_charmap_setup(const char* kcm_file_path);

/* Cleanups initialization performed in android_charmap_setup routine. */
void android_charmap_done(void);

/* Gets charmap descriptor by its name.
 * This routine tries to find a charmap by name. This will compare the
 * name to the default charmap's name, or any charmap loaded with
 * android_charmap_setup(). Returns NULL on failure.
 */
const AKeyCharmap* android_get_charmap_by_name(const char* name);

/* Maps given unicode key character into a keycode and adds mapped keycode into
 * keycode array. This routine uses charmap passed as cmap parameter to do the
 * translation, and 'down' parameter to generate appropriate ('down' or 'up')
 * keycode.
 */
int
android_charmap_reverse_map_unicode(const AKeyCharmap* cmap,
                                    unsigned int unicode,
                                    int  down,
                                    AKeycodeBuffer* keycodes);

/* Return a pointer to the active charmap. If android_charmap_setup() was
 * called succesfully, this corresponds to the newly loaded charmap.
 *
 * Otherwise, return a pointer to the default charmap.
 */
const AKeyCharmap* android_get_charmap(void);

/* Return the name of the charmap to be used. Same as
 * android_get_charmap()->name */
const char* android_get_charmap_name(void);

#endif /* _android_charmap_h */