src/charset.h

   1 /* Header for charset handler.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   5      2005, 2006, 2007, 2008, 2009, 2010, 2011
   6      National Institute of Advanced Industrial Science and Technology (AIST)
   7      Registration Number H14PRO021
   8
   9    Copyright (C) 2003
  10      National Institute of Advanced Industrial Science and Technology (AIST)
  11      Registration Number H13PRO009
  12
  13 This file is part of GNU Emacs.
  14
  15 GNU Emacs is free software: you can redistribute it and/or modify
  16 it under the terms of the GNU General Public License as published by
  17 the Free Software Foundation, either version 3 of the License, or
  18 (at your option) any later version.
  19
  20 GNU Emacs is distributed in the hope that it will be useful,
  21 but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 GNU General Public License for more details.
  24
  25 You should have received a copy of the GNU General Public License
  26 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  27
  28 #ifndef EMACS_CHARSET_H
  29 #define EMACS_CHARSET_H
  30
  31 /* Index to arguments of Fdefine_charset_internal.  */
  32
  33 enum define_charset_arg_index
  34   {
  35     charset_arg_name,
  36     charset_arg_dimension,
  37     charset_arg_code_space,
  38     charset_arg_min_code,
  39     charset_arg_max_code,
  40     charset_arg_iso_final,
  41     charset_arg_iso_revision,
  42     charset_arg_emacs_mule_id,
  43     charset_arg_ascii_compatible_p,
  44     charset_arg_supplementary_p,
  45     charset_arg_invalid_code,
  46     charset_arg_code_offset,
  47     charset_arg_map,
  48     charset_arg_subset,
  49     charset_arg_superset,
  50     charset_arg_unify_map,
  51     charset_arg_plist,
  52     charset_arg_max
  53   };
  54
  55
  56 /* Indices to charset attributes vector.  */
  57
  58 enum charset_attr_index
  59   {
  60     /* ID number of the charset.  */
  61     charset_id,
  62
  63     /* Name of the charset (symbol).  */
  64     charset_name,
  65
  66     /* Property list of the charset.  */
  67     charset_plist,
  68
  69     /* If the method of the charset is `MAP', the value is a mapping
  70        vector or a file name that contains mapping vector.  Otherwise,
  71        nil.  */
  72     charset_map,
  73
  74     /* If the method of the charset is `MAP', the value is a vector
  75        that maps code points of the charset to characters.  The vector
  76        is indexed by a character index.  A character index is
  77        calculated from a code point and the code-space table of the
  78        charset.  */
  79     charset_decoder,
  80
  81     /* If the method of the charset is `MAP', the value is a
  82        char-table that maps characters of the charset to code
  83        points.  */
  84     charset_encoder,
  85
  86     /* If the method of the charset is `SUBSET', the value is a vector
  87        that has this form:
  88
  89         [ CHARSET-ID MIN-CODE MAX-CODE OFFSET ]
  90
  91        CHARSET-ID is an ID number of a parent charset.  MIN-CODE and
  92        MAX-CODE specify the range of characters inherited from the
  93        parent.  OFFSET is an integer value to add to a code point of
  94        the parent charset to get the corresponding code point of this
  95        charset.  */
  96     charset_subset,
  97
  98     /* If the method of the charset is `SUPERSET', the value is a list
  99        whose elements have this form:
 100
 101         (CHARSET-ID . OFFSET)
 102
 103        CHARSET-IDs are ID numbers of parent charsets.  OFFSET is an
 104        integer value to add to a code point of the parent charset to
 105        get the corresponding code point of this charset.  */
 106     charset_superset,
 107
 108     /* The value is a mapping vector or a file name that contains the
 109        mapping.  This defines how characters in the charset should be
 110        unified with Unicode.  The value of the member
 111        `charset_deunifier' is created from this information.  */
 112     charset_unify_map,
 113
 114     /* If characters in the charset must be unified Unicode, the value
 115        is a char table that maps a unified Unicode character code to
 116        the non-unified character code in the charset.  */
 117     charset_deunifier,
 118
 119     /* The length of the charset attribute vector.  */
 120     charset_attr_max
 121   };
 122
 123 /* Methods for converting code points and characters of charsets.  */
 124
 125 enum charset_method
 126   {
 127     /* For a charset of this method, a character code is calculated
 128        from a character index (which is calculated from a code point)
 129        simply by adding an offset value.  */
 130     CHARSET_METHOD_OFFSET,
 131
 132     /* For a charset of this method, a decoder vector and an encoder
 133        char-table is used for code point <-> character code
 134        conversion.  */
 135     CHARSET_METHOD_MAP,
 136
 137     /* A charset of this method is a subset of another charset.  */
 138     CHARSET_METHOD_SUBSET,
 139
 140     /* A charset of this method is a superset of other charsets.  */
 141     CHARSET_METHOD_SUPERSET
 142   };
 143
 144 struct charset
 145 {
 146   /* Index to charset_table.  */
 147   int id;
 148
 149   /* Index to Vcharset_hash_table.  */
 150   int hash_index;
 151
 152   /* Dimension of the charset: 1, 2, 3, or 4.  */
 153   int dimension;
 154
 155   /* Byte code range of each dimension.  <code_space>[4N] is a mininum
 156      byte code of the (N+1)th dimension, <code_space>[4N+1] is a
 157      maximum byte code of the (N+1)th dimension, <code_space>[4N+2] is
 158      (<code_space>[4N+1] - <code_space>[4N] + 1), <code_space>[4N+3]
 159      is a number of characters containd in the first to (N+1)th
 160      dismesions.  We get `char-index' of a `code-point' from this
 161      information.  */
 162   int code_space[16];
 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 Vcharset_list;
 255 extern Lisp_Object Viso_2022_charset_list;
 256 extern Lisp_Object Vemacs_mule_charset_list;
 257
 258 extern int emacs_mule_charset[256];
 259
 260 extern Lisp_Object Vcurrent_iso639_language;
 261
 262 /* Macros to access information about charset.  */
 263
 264 /* Return the attribute vector of charset whose symbol is SYMBOL.  */
 265 #define CHARSET_SYMBOL_ATTRIBUTES(symbol)       \
 266   Fgethash ((symbol), Vcharset_hash_table, Qnil)
 267
 268 #define CHARSET_ATTR_ID(attrs)          AREF ((attrs), charset_id)
 269 #define CHARSET_ATTR_NAME(attrs)        AREF ((attrs), charset_name)
 270 #define CHARSET_ATTR_PLIST(attrs)       AREF ((attrs), charset_plist)
 271 #define CHARSET_ATTR_MAP(attrs)         AREF ((attrs), charset_map)
 272 #define CHARSET_ATTR_DECODER(attrs)     AREF ((attrs), charset_decoder)
 273 #define CHARSET_ATTR_ENCODER(attrs)     AREF ((attrs), charset_encoder)
 274 #define CHARSET_ATTR_SUBSET(attrs)      AREF ((attrs), charset_subset)
 275 #define CHARSET_ATTR_SUPERSET(attrs)    AREF ((attrs), charset_superset)
 276 #define CHARSET_ATTR_UNIFY_MAP(attrs)   AREF ((attrs), charset_unify_map)
 277 #define CHARSET_ATTR_DEUNIFIER(attrs)   AREF ((attrs), charset_deunifier)
 278
 279 #define CHARSET_SYMBOL_ID(symbol)       \
 280   CHARSET_ATTR_ID (CHARSET_SYMBOL_ATTRIBUTES (symbol))
 281
 282 /* Return an index to Vcharset_hash_table of the charset whose symbol
 283    is SYMBOL.  */
 284 #define CHARSET_SYMBOL_HASH_INDEX(symbol)       \
 285   hash_lookup (XHASH_TABLE (Vcharset_hash_table), symbol, NULL)
 286
 287 /* Return the attribute vector of CHARSET.  */
 288 #define CHARSET_ATTRIBUTES(charset)     \
 289   (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), (charset)->hash_index))
 290
 291 #define CHARSET_ID(charset)             ((charset)->id)
 292 #define CHARSET_HASH_INDEX(charset)     ((charset)->hash_index)
 293 #define CHARSET_DIMENSION(charset)      ((charset)->dimension)
 294 #define CHARSET_CODE_SPACE(charset)     ((charset)->code_space)
 295 #define CHARSET_CODE_LINEAR_P(charset)  ((charset)->code_linear_p)
 296 #define CHARSET_ISO_CHARS_96(charset)   ((charset)->iso_chars_96)
 297 #define CHARSET_ISO_FINAL(charset)      ((charset)->iso_final)
 298 #define CHARSET_ISO_PLANE(charset)      ((charset)->iso_plane)
 299 #define CHARSET_ISO_REVISION(charset)   ((charset)->iso_revision)
 300 #define CHARSET_EMACS_MULE_ID(charset)  ((charset)->emacs_mule_id)
 301 #define CHARSET_ASCII_COMPATIBLE_P(charset) ((charset)->ascii_compatible_p)
 302 #define CHARSET_COMPACT_CODES_P(charset) ((charset)->compact_codes_p)
 303 #define CHARSET_METHOD(charset)         ((charset)->method)
 304 #define CHARSET_MIN_CODE(charset)       ((charset)->min_code)
 305 #define CHARSET_MAX_CODE(charset)       ((charset)->max_code)
 306 #define CHARSET_INVALID_CODE(charset)   ((charset)->invalid_code)
 307 #define CHARSET_MIN_CHAR(charset)       ((charset)->min_char)
 308 #define CHARSET_MAX_CHAR(charset)       ((charset)->max_char)
 309 #define CHARSET_CODE_OFFSET(charset)    ((charset)->code_offset)
 310 #define CHARSET_UNIFIED_P(charset)      ((charset)->unified_p)
 311
 312 #define CHARSET_NAME(charset)           \
 313   (CHARSET_ATTR_NAME (CHARSET_ATTRIBUTES (charset)))
 314 #define CHARSET_MAP(charset)    \
 315   (CHARSET_ATTR_MAP (CHARSET_ATTRIBUTES (charset)))
 316 #define CHARSET_DECODER(charset)        \
 317   (CHARSET_ATTR_DECODER (CHARSET_ATTRIBUTES (charset)))
 318 #define CHARSET_ENCODER(charset)        \
 319   (CHARSET_ATTR_ENCODER (CHARSET_ATTRIBUTES (charset)))
 320 #define CHARSET_SUBSET(charset) \
 321   (CHARSET_ATTR_SUBSET (CHARSET_ATTRIBUTES (charset)))
 322 #define CHARSET_SUPERSET(charset)       \
 323   (CHARSET_ATTR_SUPERSET (CHARSET_ATTRIBUTES (charset)))
 324 #define CHARSET_UNIFY_MAP(charset)      \
 325   (CHARSET_ATTR_UNIFY_MAP (CHARSET_ATTRIBUTES (charset)))
 326 #define CHARSET_DEUNIFIER(charset)      \
 327   (CHARSET_ATTR_DEUNIFIER (CHARSET_ATTRIBUTES (charset)))
 328
 329
 330 /* Nonzero if OBJ is a valid charset symbol.  */
 331 #define CHARSETP(obj) (CHARSET_SYMBOL_HASH_INDEX (obj) >= 0)
 332
 333 /* Check if X is a valid charset symbol.  If not, signal an error.  */
 334 #define CHECK_CHARSET(x)                                        \
 335   do {                                                          \
 336     if (! SYMBOLP (x) || CHARSET_SYMBOL_HASH_INDEX (x) < 0)     \
 337       wrong_type_argument (Qcharsetp, (x));                     \
 338   } while (0)
 339
 340
 341 /* Check if X is a valid charset symbol.  If valid, set ID to the id
 342    number of the charset.  Otherwise, signal an error. */
 343 #define CHECK_CHARSET_GET_ID(x, id)                                     \
 344   do {                                                                  \
 345     int idx;                                                            \
 346                                                                         \
 347     if (! SYMBOLP (x) || (idx = CHARSET_SYMBOL_HASH_INDEX (x)) < 0)     \
 348       wrong_type_argument (Qcharsetp, (x));                             \
 349     id = XINT (AREF (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), idx), \
 350                      charset_id));                                      \
 351   } while (0)
 352
 353
 354 /* Check if X is a valid charset symbol.  If valid, set ATTR to the
 355    attr vector of the charset.  Otherwise, signal an error. */
 356 #define CHECK_CHARSET_GET_ATTR(x, attr)                         \
 357   do {                                                                  \
 358     if (!SYMBOLP (x) || NILP (attr = CHARSET_SYMBOL_ATTRIBUTES (x)))    \
 359       wrong_type_argument (Qcharsetp, (x));                             \
 360   } while (0)
 361
 362
 363 #define CHECK_CHARSET_GET_CHARSET(x, charset)   \
 364   do {                                          \
 365     int id;                                     \
 366     CHECK_CHARSET_GET_ID (x, id);               \
 367     charset = CHARSET_FROM_ID (id);             \
 368   } while (0)
 369
 370
 371 /* Lookup Vcharset_ordered_list and return the first charset that
 372    contains the character C.  */
 373 #define CHAR_CHARSET(c)                         \
 374   ((c) < 0x80 ? CHARSET_FROM_ID (charset_ascii) \
 375    : char_charset ((c), Qnil, NULL))
 376
 377 #if 0
 378 /* Char-table of charset-sets.  Each element is a bool vector indexed
 379    by a charset ID.  */
 380 extern Lisp_Object Vchar_charset_set;
 381
 382 /* Charset-bag of character C.  */
 383 #define CHAR_CHARSET_SET(c) \
 384   CHAR_TABLE_REF (Vchar_charset_set, c)
 385
 386 /* Check if two characters C1 and C2 belong to the same charset.  */
 387 #define SAME_CHARSET_P(c1, c2)  \
 388   intersection_p (CHAR_CHARSET_SET (c1), CHAR_CHARSET_SET (c2))
 389
 390 #endif
 391
 392
 393 /* Return a character correponding to the code-point CODE of CHARSET.
 394    Try some optimization before calling decode_char.  */
 395
 396 #define DECODE_CHAR(charset, code)                                      \
 397   ((ASCII_BYTE_P (code) && (charset)->ascii_compatible_p)               \
 398    ? (code)                                                             \
 399    : ((code) < (charset)->min_code || (code) > (charset)->max_code)     \
 400    ? -1                                                                 \
 401    : (charset)->unified_p                                               \
 402    ? decode_char ((charset), (code))                                    \
 403    : (charset)->method == CHARSET_METHOD_OFFSET                         \
 404    ? ((charset)->code_linear_p                                          \
 405       ? (code) - (charset)->min_code + (charset)->code_offset           \
 406       : decode_char ((charset), (code)))                                \
 407    : (charset)->method == CHARSET_METHOD_MAP                            \
 408    ? (((charset)->code_linear_p                                         \
 409        && VECTORP (CHARSET_DECODER (charset)))                          \
 410       ? XINT (AREF (CHARSET_DECODER (charset),                          \
 411                     (code) - (charset)->min_code))                      \
 412       : decode_char ((charset), (code)))                                \
 413    : decode_char ((charset), (code)))
 414
 415
 416 /* If CHARSET is a simple offset base charset, return it's offset,
 417    otherwise return -1.  */
 418 #define CHARSET_OFFSET(charset)                         \
 419   (((charset)->method == CHARSET_METHOD_OFFSET          \
 420     && (charset)->code_linear_p                         \
 421     && ! (charset)->unified_p)                          \
 422    ? (charset)->code_offset - (charset)->min_code       \
 423    : -1)
 424
 425 extern Lisp_Object charset_work;
 426
 427 /* Return a code point of CHAR in CHARSET.
 428    Try some optimization before calling encode_char.  */
 429
 430 #define ENCODE_CHAR(charset, c)                                          \
 431   ((ASCII_CHAR_P (c) && (charset)->ascii_compatible_p)                   \
 432    ? (c)                                                                 \
 433    : ((charset)->unified_p                                               \
 434       || (charset)->method == CHARSET_METHOD_SUBSET                      \
 435       || (charset)->method == CHARSET_METHOD_SUPERSET)                   \
 436    ? encode_char ((charset), (c))                                        \
 437    : ((c) < (charset)->min_char || (c) > (charset)->max_char)            \
 438    ? (charset)->invalid_code                                             \
 439    : (charset)->method == CHARSET_METHOD_OFFSET                          \
 440    ? ((charset)->code_linear_p                                           \
 441       ? (c) - (charset)->code_offset + (charset)->min_code               \
 442       : encode_char ((charset), (c)))                                    \
 443    : (charset)->method == CHARSET_METHOD_MAP                             \
 444    ? (((charset)->compact_codes_p                                        \
 445        && CHAR_TABLE_P (CHARSET_ENCODER (charset)))                      \
 446       ? (charset_work = CHAR_TABLE_REF (CHARSET_ENCODER (charset), (c)), \
 447          (NILP (charset_work)                                            \
 448           ? (charset)->invalid_code                                      \
 449           : XFASTINT (charset_work)))                                    \
 450       : encode_char ((charset), (c)))                                    \
 451    : encode_char ((charset), (c)))
 452
 453
 454 /* Set to 1 when a charset map is loaded to warn that a buffer text
 455    and a string data may be relocated.  */
 456 extern int charset_map_loaded;
 457
 458
 459 /* Set CHARSET to the charset highest priority of C, CODE to the
 460    code-point of C in CHARSET.  */
 461 #define SPLIT_CHAR(c, charset, code)    \
 462   ((charset) = char_charset ((c), Qnil, &(code)))
 463
 464
 465 #define ISO_MAX_DIMENSION 3
 466 #define ISO_MAX_CHARS 2
 467 #define ISO_MAX_FINAL 0x80      /* only 0x30..0xFF are used */
 468
 469 /* Mapping table from ISO2022's charset (specified by DIMENSION,
 470    CHARS, and FINAL_CHAR) to Emacs' charset ID.  Should be accessed by
 471    macro ISO_CHARSET_TABLE (DIMENSION, CHARS, FINAL_CHAR).  */
 472 extern int iso_charset_table[ISO_MAX_DIMENSION][ISO_MAX_CHARS][ISO_MAX_FINAL];
 473
 474 /* A charset of type iso2022 who has DIMENSION, CHARS, and FINAL
 475    (final character).  */
 476 #define ISO_CHARSET_TABLE(dimension, chars_96, final)   \
 477   iso_charset_table[(dimension) - 1][(chars_96)][(final)]
 478
 479 /* Nonzero if the charset who has FAST_MAP may contain C.  */
 480 #define CHARSET_FAST_MAP_REF(c, fast_map)               \
 481   ((c) < 0x10000                                        \
 482    ? fast_map[(c) >> 10] & (1 << (((c) >> 7) & 7))      \
 483    : fast_map[((c) >> 15) + 62] & (1 << (((c) >> 12) & 7)))
 484
 485 #define CHARSET_FAST_MAP_SET(c, fast_map)                       \
 486   do {                                                          \
 487     if ((c) < 0x10000)                                          \
 488       (fast_map)[(c) >> 10] |= 1 << (((c) >> 7) & 7);           \
 489     else                                                        \
 490       (fast_map)[((c) >> 15) + 62] |= 1 << (((c) >> 12) & 7);   \
 491   } while (0)
 492
 493
 494
 495 /* 1 if CHARSET may contain the character C.  */
 496 #define CHAR_CHARSET_P(c, charset)                                       \
 497   ((ASCII_CHAR_P (c) && (charset)->ascii_compatible_p)                   \
 498    || ((CHARSET_UNIFIED_P (charset)                                      \
 499         || (charset)->method == CHARSET_METHOD_SUBSET                    \
 500         || (charset)->method == CHARSET_METHOD_SUPERSET)                 \
 501        ? encode_char ((charset), (c)) != (charset)->invalid_code         \
 502        : (CHARSET_FAST_MAP_REF ((c), (charset)->fast_map)                \
 503           && ((charset)->method == CHARSET_METHOD_OFFSET                 \
 504               ? (c) >= (charset)->min_char && (c) <= (charset)->max_char \
 505               : ((charset)->method == CHARSET_METHOD_MAP                 \
 506                  && (charset)->compact_codes_p                           \
 507                  && CHAR_TABLE_P (CHARSET_ENCODER (charset)))            \
 508               ? ! NILP (CHAR_TABLE_REF (CHARSET_ENCODER (charset), (c))) \
 509               : encode_char ((charset), (c)) != (charset)->invalid_code))))
 510
 511 \f
 512 /* Special macros for emacs-mule encoding.  */
 513
 514 /* Leading-code followed by extended leading-code.    DIMENSION/COLUMN */
 515 #define EMACS_MULE_LEADING_CODE_PRIVATE_11      0x9A /* 1/1 */
 516 #define EMACS_MULE_LEADING_CODE_PRIVATE_12      0x9B /* 1/2 */
 517 #define EMACS_MULE_LEADING_CODE_PRIVATE_21      0x9C /* 2/2 */
 518 #define EMACS_MULE_LEADING_CODE_PRIVATE_22      0x9D /* 2/2 */
 519
 520 \f
 521
 522 extern Lisp_Object Qcharsetp;
 523
 524 extern Lisp_Object Qascii, Qunicode;
 525 extern int charset_ascii, charset_eight_bit;
 526 extern int charset_iso_8859_1;
 527 extern int charset_unicode;
 528 extern int charset_jisx0201_roman;
 529 extern int charset_jisx0208_1978;
 530 extern int charset_jisx0208;
 531 extern int charset_ksc5601;
 532
 533 extern int charset_unibyte;
 534
 535 extern struct charset *char_charset (int, Lisp_Object, unsigned *);
 536 extern Lisp_Object charset_attributes (int);
 537
 538 extern int maybe_unify_char (int, Lisp_Object);
 539 extern int decode_char (struct charset *, unsigned);
 540 extern unsigned encode_char (struct charset *, int);
 541 extern int string_xstring_p (Lisp_Object);
 542
 543 extern void map_charset_chars (void (*) (Lisp_Object, Lisp_Object),
 544                                Lisp_Object, Lisp_Object,
 545                                struct charset *, unsigned, unsigned);
 546
 547 #endif /* EMACS_CHARSET_H */
 548