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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#ifndef BRLTTY_INCLUDED_TTB_INTERNAL
#define BRLTTY_INCLUDED_TTB_INTERNAL
#include "bitmask.h"
#include "unicode.h"
#include "dataarea.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef uint32_t TextTableOffset;
#define CHARSET_BYTE_BITS 8
#define CHARSET_BYTE_COUNT (1 << CHARSET_BYTE_BITS)
#define CHARSET_BYTE_MAXIMUM (CHARSET_BYTE_COUNT - 1)
typedef struct {
unsigned char cells[UNICODE_CELLS_PER_ROW];
BITMASK(cellDefined, UNICODE_CELLS_PER_ROW, char);
BITMASK(cellAliased, UNICODE_CELLS_PER_ROW, char);
} UnicodeRowEntry;
typedef struct {
TextTableOffset rows[UNICODE_ROWS_PER_PLANE];
} UnicodePlaneEntry;
typedef struct {
TextTableOffset planes[UNICODE_PLANES_PER_GROUP];
} UnicodeGroupEntry;
typedef struct {
wchar_t from;
wchar_t to;
} TextTableAliasEntry;
typedef struct {
TextTableOffset unicodeGroups[UNICODE_GROUP_COUNT];
wchar_t inputCharacters[0X100];
BITMASK(inputCharacterDefined, 0X100, char);
DataOffset aliasArray;
uint32_t aliasCount;
} TextTableHeader;
struct TextTableStruct {
union {
TextTableHeader *fields;
const unsigned char *bytes;
} header;
size_t size;
struct {
unsigned char tryBaseCharacter;
} options;
struct {
const unsigned char *replacementCharacter;
} cells;
};
extern const TextTableAliasEntry *locateTextTableAlias (
wchar_t character, const TextTableAliasEntry *array, size_t count
);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* BRLTTY_INCLUDED_TTB_INTERNAL */
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