src/charset.h

   1 /* Header for charset handler.
   2    Copyright (C) 2001-2011 Free Software Foundation, Inc.
   3    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4      2005, 2006, 2007, 2008, 2009, 2010, 2011
   5      National Institute of Advanced Industrial Science and Technology (AIST)
   6      Registration Number H14PRO021
   7
   8    Copyright (C) 2003
   9      National Institute of Advanced Industrial Science and Technology (AIST)
  10      Registration Number H13PRO009
  11
  12 This file is part of GNU Emacs.
  13
  14 GNU Emacs is free software: you can redistribute it and/or modify
  15 it under the terms of the GNU General Public License as published by
  16 the Free Software Foundation, either version 3 of the License, or
  17 (at your option) any later version.
  18
  19 GNU Emacs is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef EMACS_CHARSET_H
  28 #define EMACS_CHARSET_H
  29
  30 /* Index to arguments of Fdefine_charset_internal.  */
  31
  32 enum define_charset_arg_index
  33   {
  34     charset_arg_name,
  35     charset_arg_dimension,
  36     charset_arg_code_space,
  37     charset_arg_min_code,
  38     charset_arg_max_code,
  39     charset_arg_iso_final,
  40     charset_arg_iso_revision,
  41     charset_arg_emacs_mule_id,
  42     charset_arg_ascii_compatible_p,
  43     charset_arg_supplementary_p,
  44     charset_arg_invalid_code,
  45     charset_arg_code_offset,
  46     charset_arg_map,
  47     charset_arg_subset,
  48     charset_arg_superset,
  49     charset_arg_unify_map,
  50     charset_arg_plist,
  51     charset_arg_max
  52   };
  53
  54
  55 /* Indices to charset attributes vector.  */
  56
  57 enum charset_attr_index
  58   {
  59     /* ID number of the charset.  */
  60     charset_id,
  61
  62     /* Name of the charset (symbol).  */
  63     charset_name,
  64
  65     /* Property list of the charset.  */
  66     charset_plist,
  67
  68     /* If the method of the charset is `MAP', the value is a mapping
  69        vector or a file name that contains mapping vector.  Otherwise,
  70        nil.  */
  71     charset_map,
  72
  73     /* If the method of the charset is `MAP', the value is a vector
  74        that maps code points of the charset to characters.  The vector
  75        is indexed by a character index.  A character index is
  76        calculated from a code point and the code-space table of the
  77        charset.  */
  78     charset_decoder,
  79
  80     /* If the method of the charset is `MAP', the value is a
  81        char-table that maps characters of the charset to code
  82        points.  */
  83     charset_encoder,
  84
  85     /* If the method of the charset is `SUBSET', the value is a vector
  86        that has this form:
  87
  88         [ CHARSET-ID MIN-CODE MAX-CODE OFFSET ]
  89
  90        CHARSET-ID is an ID number of a parent charset.  MIN-CODE and
  91        MAX-CODE specify the range of characters inherited from the
  92        parent.  OFFSET is an integer value to add to a code point of
  93        the parent charset to get the corresponding code point of this
  94        charset.  */
  95     charset_subset,
  96
  97     /* If the method of the charset is `SUPERSET', the value is a list
  98        whose elements have this form:
  99
 100         (CHARSET-ID . OFFSET)
 101
 102        CHARSET-IDs are ID numbers of parent charsets.  OFFSET is an
 103        integer value to add to a code point of the parent charset to
 104        get the corresponding code point of this charset.  */
 105     charset_superset,
 106
 107     /* The value is a mapping vector or a file name that contains the
 108        mapping.  This defines how characters in the charset should be
 109        unified with Unicode.  The value of the member
 110        `charset_deunifier' is created from this information.  */
 111     charset_unify_map,
 112
 113     /* If characters in the charset must be unified Unicode, the value
 114        is a char table that maps a unified Unicode character code to
 115        the non-unified character code in the charset.  */
 116     charset_deunifier,
 117
 118     /* The length of the charset attribute vector.  */
 119     charset_attr_max
 120   };
 121
 122 /* Methods for converting code points and characters of charsets.  */
 123
 124 enum charset_method
 125   {
 126     /* For a charset of this method, a character code is calculated
 127        from a character index (which is calculated from a code point)
 128        simply by adding an offset value.  */
 129     CHARSET_METHOD_OFFSET,
 130
 131     /* For a charset of this method, a decoder vector and an encoder
 132        char-table is used for code point <-> character code
 133        conversion.  */
 134     CHARSET_METHOD_MAP,
 135
 136     /* A charset of this method is a subset of another charset.  */
 137     CHARSET_METHOD_SUBSET,
 138
 139     /* A charset of this method is a superset of other charsets.  */
 140     CHARSET_METHOD_SUPERSET
 141   };
 142
 143 struct charset
 144 {
 145   /* Index to charset_table.  */
 146   int id;
 147
 148   /* Index to Vcharset_hash_table.  */
 149   int hash_index;
 150
 151   /* Dimension of the charset: 1, 2, 3, or 4.  */
 152   int dimension;
 153
 154   /* Byte code range of each dimension.  <code_space>[4N] is a mininum
 155      byte code of the (N+1)th dimension, <code_space>[4N+1] is a
 156      maximum byte code of the (N+1)th dimension, <code_space>[4N+2] is
 157      (<code_space>[4N+1] - <code_space>[4N] + 1), <code_space>[4N+3]
 158      is the number of characters contained in the first through (N+1)th
 159      dimensions, except that there is no <code_space>[15].
 160      We get `char-index' of a `code-point' from this
 161      information.  */
 162   int code_space[15];
 163
 164   /* If B is a byte of Nth dimension of a code-point, the (N-1)th bit
 165      of code_space_mask[B] is set.  This array is used to quickly
 166      check if a code-point is in a valid range.  */
 167   unsigned char *code_space_mask;
 168
 169   /* 1 if there's no gap in code-points.  */
 170   int code_linear_p;
 171
 172   /* If the charset is treated as 94-chars in ISO-2022, the value is 0.
 173      If the charset is treated as 96-chars in ISO-2022, the value is 1.  */
 174   int iso_chars_96;
 175
 176   /* ISO final byte of the charset: 48..127.  It may be -1 if the
 177      charset doesn't conform to ISO-2022.  */
 178   int iso_final;
 179
 180   /* ISO revision number of the charset.  */
 181   int iso_revision;
 182
 183   /* If the charset is identical to what supported by Emacs 21 and the
 184      priors, the identification number of the charset used in those
 185      version.  Otherwise, -1.  */
 186   int emacs_mule_id;
 187
 188   /* Nonzero if the charset is compatible with ASCII.  */
 189   int ascii_compatible_p;
 190
 191   /* Nonzero if the charset is supplementary.  */
 192   int supplementary_p;
 193
 194   /* Nonzero if all the code points are representable by Lisp_Int.  */
 195   int compact_codes_p;
 196
 197   /* The method for encoding/decoding characters of the charset.  */
 198   enum charset_method method;
 199
 200   /* Mininum and Maximum code points of the charset.  */
 201   unsigned min_code, max_code;
 202
 203   /* Offset value used by macros CODE_POINT_TO_INDEX and
 204       INDEX_TO_CODE_POINT. .  */
 205   unsigned char_index_offset;
 206
 207   /* Mininum and Maximum character codes of the charset.  If the
 208      charset is compatible with ASCII, min_char is a minimum non-ASCII
 209      character of the charset.  If the method of charset is
 210      CHARSET_METHOD_OFFSET, even if the charset is unified, min_char
 211      and max_char doesn't change.  */
 212   int min_char, max_char;
 213
 214   /* The code returned by ENCODE_CHAR if a character is not encodable
 215      by the charset.  */
 216   unsigned invalid_code;
 217
 218   /* If the method of the charset is CHARSET_METHOD_MAP, this is a
 219      table of bits used to quickly and roughly guess if a character
 220      belongs to the charset.
 221
 222      The first 64 elements are 512 bits for characters less than
 223      0x10000.  Each bit corresponds to 128-character block.  The last
 224      126 elements are 1008 bits for the greater characters
 225      (0x10000..0x3FFFFF).  Each bit corresponds to 4096-character
 226      block.
 227
 228      If a bit is 1, at least one character in the corresponding block is
 229      in this charset.  */
 230   unsigned char fast_map[190];
 231
 232   /* Offset value to calculate a character code from code-point, and
 233      visa versa.  */
 234   int code_offset;
 235
 236   int unified_p;
 237 };
 238
 239 /* Hash table of charset symbols vs. the correponding attribute
 240    vectors.  */
 241 extern Lisp_Object Vcharset_hash_table;
 242
 243 /* Table of struct charset.  */
 244 extern struct charset *charset_table;
 245
 246 #define CHARSET_FROM_ID(id) (charset_table + (id))
 247
 248 extern Lisp_Object Vcharset_ordered_list;
 249 extern Lisp_Object Vcharset_non_preferred_head;
 250
 251 /* Incremented everytime we change the priority of charsets.  */
 252 extern unsigned short charset_ordered_list_tick;
 253
 254 extern Lisp_Object Viso_2022_charset_list;
 255 extern Lisp_Object Vemacs_mule_charset_list;
 256
 257 extern int emacs_mule_charset[256];
 258
 259 /* Macros to access information about charset.  */
 260
 261 /* Return the attribute vector of charset whose symbol is SYMBOL.  */
 262 #define CHARSET_SYMBOL_ATTRIBUTES(symbol)       \
 263   Fgethash ((symbol), Vcharset_hash_table, Qnil)
 264
 265 #define CHARSET_ATTR_ID(attrs)          AREF ((attrs), charset_id)
 266 #define CHARSET_ATTR_NAME(attrs)        AREF ((attrs), charset_name)
 267 #define CHARSET_ATTR_PLIST(attrs)       AREF ((attrs), charset_plist)
 268 #define CHARSET_ATTR_MAP(attrs)         AREF ((attrs), charset_map)
 269 #define CHARSET_ATTR_DECODER(attrs)     AREF ((attrs), charset_decoder)
 270 #define CHARSET_ATTR_ENCODER(attrs)     AREF ((attrs), charset_encoder)
 271 #define CHARSET_ATTR_SUBSET(attrs)      AREF ((attrs), charset_subset)
 272 #define CHARSET_ATTR_SUPERSET(attrs)    AREF ((attrs), charset_superset)
 273 #define CHARSET_ATTR_UNIFY_MAP(attrs)   AREF ((attrs), charset_unify_map)
 274 #define CHARSET_ATTR_DEUNIFIER(attrs)   AREF ((attrs), charset_deunifier)
 275
 276 #define CHARSET_SYMBOL_ID(symbol)       \
 277   CHARSET_ATTR_ID (CHARSET_SYMBOL_ATTRIBUTES (symbol))
 278
 279 /* Return an index to Vcharset_hash_table of the charset whose symbol
 280    is SYMBOL.  */
 281 #define CHARSET_SYMBOL_HASH_INDEX(symbol)       \
 282   hash_lookup (XHASH_TABLE (Vcharset_hash_table), symbol, NULL)
 283
 284 /* Return the attribute vector of CHARSET.  */
 285 #define CHARSET_ATTRIBUTES(charset)     \
 286   (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), (charset)->hash_index))
 287
 288 #define CHARSET_ID(charset)             ((charset)->id)
 289 #define CHARSET_HASH_INDEX(charset)     ((charset)->hash_index)
 290 #define CHARSET_DIMENSION(charset)      ((charset)->dimension)
 291 #define CHARSET_CODE_SPACE(charset)     ((charset)->code_space)
 292 #define CHARSET_CODE_LINEAR_P(charset)  ((charset)->code_linear_p)
 293 #define CHARSET_ISO_CHARS_96(charset)   ((charset)->iso_chars_96)
 294 #define CHARSET_ISO_FINAL(charset)      ((charset)->iso_final)
 295 #define CHARSET_ISO_PLANE(charset)      ((charset)->iso_plane)
 296 #define CHARSET_ISO_REVISION(charset)   ((charset)->iso_revision)
 297 #define CHARSET_EMACS_MULE_ID(charset)  ((charset)->emacs_mule_id)
 298 #define CHARSET_ASCII_COMPATIBLE_P(charset) ((charset)->ascii_compatible_p)
 299 #define CHARSET_COMPACT_CODES_P(charset) ((charset)->compact_codes_p)
 300 #define CHARSET_METHOD(charset)         ((charset)->method)
 301 #define CHARSET_MIN_CODE(charset)       ((charset)->min_code)
 302 #define CHARSET_MAX_CODE(charset)       ((charset)->max_code)
 303 #define CHARSET_INVALID_CODE(charset)   ((charset)->invalid_code)
 304 #define CHARSET_MIN_CHAR(charset)       ((charset)->min_char)
 305 #define CHARSET_MAX_CHAR(charset)       ((charset)->max_char)
 306 #define CHARSET_CODE_OFFSET(charset)    ((charset)->code_offset)
 307 #define CHARSET_UNIFIED_P(charset)      ((charset)->unified_p)
 308
 309 #define CHARSET_NAME(charset)           \
 310   (CHARSET_ATTR_NAME (CHARSET_ATTRIBUTES (charset)))
 311 #define CHARSET_MAP(charset)    \
 312   (CHARSET_ATTR_MAP (CHARSET_ATTRIBUTES (charset)))
 313 #define CHARSET_DECODER(charset)        \
 314   (CHARSET_ATTR_DECODER (CHARSET_ATTRIBUTES (charset)))
 315 #define CHARSET_ENCODER(charset)        \
 316   (CHARSET_ATTR_ENCODER (CHARSET_ATTRIBUTES (charset)))
 317 #define CHARSET_SUBSET(charset) \
 318   (CHARSET_ATTR_SUBSET (CHARSET_ATTRIBUTES (charset)))
 319 #define CHARSET_SUPERSET(charset)       \
 320   (CHARSET_ATTR_SUPERSET (CHARSET_ATTRIBUTES (charset)))
 321 #define CHARSET_UNIFY_MAP(charset)      \
 322   (CHARSET_ATTR_UNIFY_MAP (CHARSET_ATTRIBUTES (charset)))
 323 #define CHARSET_DEUNIFIER(charset)      \
 324   (CHARSET_ATTR_DEUNIFIER (CHARSET_ATTRIBUTES (charset)))
 325
 326
 327 /* Nonzero if OBJ is a valid charset symbol.  */
 328 #define CHARSETP(obj) (CHARSET_SYMBOL_HASH_INDEX (obj) >= 0)
 329
 330 /* Check if X is a valid charset symbol.  If not, signal an error.  */
 331 #define CHECK_CHARSET(x)                                        \
 332   do {                                                          \
 333     if (! SYMBOLP (x) || CHARSET_SYMBOL_HASH_INDEX (x) < 0)     \
 334       wrong_type_argument (Qcharsetp, (x));                     \
 335   } while (0)
 336
 337
 338 /* Check if X is a valid charset symbol.  If valid, set ID to the id
 339    number of the charset.  Otherwise, signal an error. */
 340 #define CHECK_CHARSET_GET_ID(x, id)                                     \
 341   do {                                                                  \
 342     int idx;                                                            \
 343                                                                         \
 344     if (! SYMBOLP (x) || (idx = CHARSET_SYMBOL_HASH_INDEX (x)) < 0)     \
 345       wrong_type_argument (Qcharsetp, (x));                             \
 346     id = XINT (AREF (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), idx), \
 347                      charset_id));                                      \
 348   } while (0)
 349
 350
 351 /* Check if X is a valid charset symbol.  If valid, set ATTR to the
 352    attr vector of the charset.  Otherwise, signal an error. */
 353 #define CHECK_CHARSET_GET_ATTR(x, attr)                         \
 354   do {                                                                  \
 355     if (!SYMBOLP (x) || NILP (attr = CHARSET_SYMBOL_ATTRIBUTES (x)))    \
 356       wrong_type_argument (Qcharsetp, (x));                             \
 357   } while (0)
 358
 359
 360 #define CHECK_CHARSET_GET_CHARSET(x, charset)   \
 361   do {                                          \
 362     int csid;                                   \
 363     CHECK_CHARSET_GET_ID (x, csid);             \
 364     charset = CHARSET_FROM_ID (csid);           \
 365   } while (0)
 366
 367
 368 /* Lookup Vcharset_ordered_list and return the first charset that
 369    contains the character C.  */
 370 #define CHAR_CHARSET(c)                         \
 371   ((c) < 0x80 ? CHARSET_FROM_ID (charset_ascii) \
 372    : char_charset ((c), Qnil, NULL))
 373
 374 #if 0
 375 /* Char-table of charset-sets.  Each element is a bool vector indexed
 376    by a charset ID.  */
 377 extern Lisp_Object Vchar_charset_set;
 378
 379 /* Charset-bag of character C.  */
 380 #define CHAR_CHARSET_SET(c) \
 381   CHAR_TABLE_REF (Vchar_charset_set, c)
 382
 383 /* Check if two characters C1 and C2 belong to the same charset.  */
 384 #define SAME_CHARSET_P(c1, c2)  \
 385   intersection_p (CHAR_CHARSET_SET (c1), CHAR_CHARSET_SET (c2))
 386
 387 #endif
 388
 389
 390 /* Return a character correponding to the code-point CODE of CHARSET.
 391    Try some optimization before calling decode_char.  */
 392
 393 #define DECODE_CHAR(charset, code)                                      \
 394   ((ASCII_BYTE_P (code) && (charset)->ascii_compatible_p)               \
 395    ? (code)                                                             \
 396    : ((code) < (charset)->min_code || (code) > (charset)->max_code)     \
 397    ? -1                                                                 \
 398    : (charset)->unified_p                                               \
 399    ? decode_char ((charset), (code))                                    \
 400    : (charset)->method == CHARSET_METHOD_OFFSET                         \
 401    ? ((charset)->code_linear_p                                          \
 402       ? (code) - (charset)->min_code + (charset)->code_offset           \
 403       : decode_char ((charset), (code)))                                \
 404    : (charset)->method == CHARSET_METHOD_MAP                            \
 405    ? (((charset)->code_linear_p                                         \
 406        && VECTORP (CHARSET_DECODER (charset)))                          \
 407       ? XINT (AREF (CHARSET_DECODER (charset),                          \
 408                     (code) - (charset)->min_code))                      \
 409       : decode_char ((charset), (code)))                                \
 410    : decode_char ((charset), (code)))
 411
 412
 413 /* If CHARSET is a simple offset base charset, return it's offset,
 414    otherwise return -1.  */
 415 #define CHARSET_OFFSET(charset)                         \
 416   (((charset)->method == CHARSET_METHOD_OFFSET          \
 417     && (charset)->code_linear_p                         \
 418     && ! (charset)->unified_p)                          \
 419    ? (charset)->code_offset - (charset)->min_code       \
 420    : -1)
 421
 422 extern Lisp_Object charset_work;
 423
 424 /* Return a code point of CHAR in CHARSET.
 425    Try some optimization before calling encode_char.  */
 426
 427 #define ENCODE_CHAR(charset, c)                                          \
 428   ((ASCII_CHAR_P (c) && (charset)->ascii_compatible_p)                   \
 429    ? (c)                                                                 \
 430    : ((charset)->unified_p                                               \
 431       || (charset)->method == CHARSET_METHOD_SUBSET                      \
 432       || (charset)->method == CHARSET_METHOD_SUPERSET)                   \
 433    ? encode_char ((charset), (c))                                        \
 434    : ((c) < (charset)->min_char || (c) > (charset)->max_char)            \
 435    ? (charset)->invalid_code                                             \
 436    : (charset)->method == CHARSET_METHOD_OFFSET                          \
 437    ? ((charset)->code_linear_p                                           \
 438       ? (c) - (charset)->code_offset + (charset)->min_code               \
 439       : encode_char ((charset), (c)))                                    \
 440    : (charset)->method == CHARSET_METHOD_MAP                             \
 441    ? (((charset)->compact_codes_p                                        \
 442        && CHAR_TABLE_P (CHARSET_ENCODER (charset)))                      \
 443       ? (charset_work = CHAR_TABLE_REF (CHARSET_ENCODER (charset), (c)), \
 444          (NILP (charset_work)                                            \
 445           ? (charset)->invalid_code                                      \
 446           : XFASTINT (charset_work)))                                    \
 447       : encode_char ((charset), (c)))                                    \
 448    : encode_char ((charset), (c)))
 449
 450
 451 /* Set to 1 when a charset map is loaded to warn that a buffer text
 452    and a string data may be relocated.  */
 453 extern int charset_map_loaded;
 454
 455
 456 /* Set CHARSET to the charset highest priority of C, CODE to the
 457    code-point of C in CHARSET.  */
 458 #define SPLIT_CHAR(c, charset, code)    \
 459   ((charset) = char_charset ((c), Qnil, &(code)))
 460
 461
 462 #define ISO_MAX_DIMENSION 3
 463 #define ISO_MAX_CHARS 2
 464 #define ISO_MAX_FINAL 0x80      /* only 0x30..0xFF are used */
 465
 466 /* Mapping table from ISO2022's charset (specified by DIMENSION,
 467    CHARS, and FINAL_CHAR) to Emacs' charset ID.  Should be accessed by
 468    macro ISO_CHARSET_TABLE (DIMENSION, CHARS, FINAL_CHAR).  */
 469 extern int iso_charset_table[ISO_MAX_DIMENSION][ISO_MAX_CHARS][ISO_MAX_FINAL];
 470
 471 /* A charset of type iso2022 who has DIMENSION, CHARS, and FINAL
 472    (final character).  */
 473 #define ISO_CHARSET_TABLE(dimension, chars_96, final)   \
 474   iso_charset_table[(dimension) - 1][(chars_96)][(final)]
 475
 476 /* Nonzero if the charset who has FAST_MAP may contain C.  */
 477 #define CHARSET_FAST_MAP_REF(c, fast_map)               \
 478   ((c) < 0x10000                                        \
 479    ? fast_map[(c) >> 10] & (1 << (((c) >> 7) & 7))      \
 480    : fast_map[((c) >> 15) + 62] & (1 << (((c) >> 12) & 7)))
 481
 482 #define CHARSET_FAST_MAP_SET(c, fast_map)                       \
 483   do {                                                          \
 484     if ((c) < 0x10000)                                          \
 485       (fast_map)[(c) >> 10] |= 1 << (((c) >> 7) & 7);           \
 486     else                                                        \
 487       (fast_map)[((c) >> 15) + 62] |= 1 << (((c) >> 12) & 7);   \
 488   } while (0)
 489
 490
 491
 492 /* 1 if CHARSET may contain the character C.  */
 493 #define CHAR_CHARSET_P(c, charset)                                       \
 494   ((ASCII_CHAR_P (c) && (charset)->ascii_compatible_p)                   \
 495    || ((CHARSET_UNIFIED_P (charset)                                      \
 496         || (charset)->method == CHARSET_METHOD_SUBSET                    \
 497         || (charset)->method == CHARSET_METHOD_SUPERSET)                 \
 498        ? encode_char ((charset), (c)) != (charset)->invalid_code         \
 499        : (CHARSET_FAST_MAP_REF ((c), (charset)->fast_map)                \
 500           && ((charset)->method == CHARSET_METHOD_OFFSET                 \
 501               ? (c) >= (charset)->min_char && (c) <= (charset)->max_char \
 502               : ((charset)->method == CHARSET_METHOD_MAP                 \
 503                  && (charset)->compact_codes_p                           \
 504                  && CHAR_TABLE_P (CHARSET_ENCODER (charset)))            \
 505               ? ! NILP (CHAR_TABLE_REF (CHARSET_ENCODER (charset), (c))) \
 506               : encode_char ((charset), (c)) != (charset)->invalid_code))))
 507
 508 \f
 509 /* Special macros for emacs-mule encoding.  */
 510
 511 /* Leading-code followed by extended leading-code.    DIMENSION/COLUMN */
 512 #define EMACS_MULE_LEADING_CODE_PRIVATE_11      0x9A /* 1/1 */
 513 #define EMACS_MULE_LEADING_CODE_PRIVATE_12      0x9B /* 1/2 */
 514 #define EMACS_MULE_LEADING_CODE_PRIVATE_21      0x9C /* 2/2 */
 515 #define EMACS_MULE_LEADING_CODE_PRIVATE_22      0x9D /* 2/2 */
 516
 517 \f
 518
 519 extern Lisp_Object Qcharsetp;
 520
 521 extern Lisp_Object Qascii;
 522 extern int charset_ascii, charset_eight_bit;
 523 extern int charset_unicode;
 524 extern int charset_jisx0201_roman;
 525 extern int charset_jisx0208_1978;
 526 extern int charset_jisx0208;
 527 extern int charset_ksc5601;
 528
 529 extern int charset_unibyte;
 530
 531 extern struct charset *char_charset (int, Lisp_Object, unsigned *);
 532 extern Lisp_Object charset_attributes (int);
 533
 534 extern int maybe_unify_char (int, Lisp_Object);
 535 extern int decode_char (struct charset *, unsigned);
 536 extern unsigned encode_char (struct charset *, int);
 537 extern int string_xstring_p (Lisp_Object);
 538
 539 extern void map_charset_chars (void (*) (Lisp_Object, Lisp_Object),
 540                                Lisp_Object, Lisp_Object,
 541                                struct charset *, unsigned, unsigned);
 542
 543 #endif /* EMACS_CHARSET_H */