src/charset.h

   1 /* Header for charset handler.
   2    Copyright (C) 2001-2012 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 #include <verify.h>
  31
  32 /* Index to arguments of Fdefine_charset_internal.  */
  33
  34 enum define_charset_arg_index
  35   {
  36     charset_arg_name,
  37     charset_arg_dimension,
  38     charset_arg_code_space,
  39     charset_arg_min_code,
  40     charset_arg_max_code,
  41     charset_arg_iso_final,
  42     charset_arg_iso_revision,
  43     charset_arg_emacs_mule_id,
  44     charset_arg_ascii_compatible_p,
  45     charset_arg_supplementary_p,
  46     charset_arg_invalid_code,
  47     charset_arg_code_offset,
  48     charset_arg_map,
  49     charset_arg_subset,
  50     charset_arg_superset,
  51     charset_arg_unify_map,
  52     charset_arg_plist,
  53     charset_arg_max
  54   };
  55
  56
  57 /* Indices to charset attributes vector.  */
  58
  59 enum charset_attr_index
  60   {
  61     /* ID number of the charset.  */
  62     charset_id,
  63
  64     /* Name of the charset (symbol).  */
  65     charset_name,
  66
  67     /* Property list of the charset.  */
  68     charset_plist,
  69
  70     /* If the method of the charset is `MAP', the value is a mapping
  71        vector or a file name that contains mapping vector.  Otherwise,
  72        nil.  */
  73     charset_map,
  74
  75     /* If the method of the charset is `MAP', the value is a vector
  76        that maps code points of the charset to characters.  The vector
  77        is indexed by a character index.  A character index is
  78        calculated from a code point and the code-space table of the
  79        charset.  */
  80     charset_decoder,
  81
  82     /* If the method of the charset is `MAP', the value is a
  83        char-table that maps characters of the charset to code
  84        points.  */
  85     charset_encoder,
  86
  87     /* If the method of the charset is `SUBSET', the value is a vector
  88        that has this form:
  89
  90         [ CHARSET-ID MIN-CODE MAX-CODE OFFSET ]
  91
  92        CHARSET-ID is an ID number of a parent charset.  MIN-CODE and
  93        MAX-CODE specify the range of characters inherited from the
  94        parent.  OFFSET is an integer value to add to a code point of
  95        the parent charset to get the corresponding code point of this
  96        charset.  */
  97     charset_subset,
  98
  99     /* If the method of the charset is `SUPERSET', the value is a list
 100        whose elements have this form:
 101
 102         (CHARSET-ID . OFFSET)
 103
 104        CHARSET-IDs are ID numbers of parent charsets.  OFFSET is an
 105        integer value to add to a code point of the parent charset to
 106        get the corresponding code point of this charset.  */
 107     charset_superset,
 108
 109     /* The value is a mapping vector or a file name that contains the
 110        mapping.  This defines how characters in the charset should be
 111        unified with Unicode.  The value of the member
 112        `charset_deunifier' is created from this information.  */
 113     charset_unify_map,
 114
 115     /* If characters in the charset must be unified Unicode, the value
 116        is a char table that maps a unified Unicode character code to
 117        the non-unified character code in the charset.  */
 118     charset_deunifier,
 119
 120     /* The length of the charset attribute vector.  */
 121     charset_attr_max
 122   };
 123
 124 /* Methods for converting code points and characters of charsets.  */
 125
 126 enum charset_method
 127   {
 128     /* For a charset of this method, a character code is calculated
 129        from a character index (which is calculated from a code point)
 130        simply by adding an offset value.  */
 131     CHARSET_METHOD_OFFSET,
 132
 133     /* For a charset of this method, a decoder vector and an encoder
 134        char-table is used for code point <-> character code
 135        conversion.  */
 136     CHARSET_METHOD_MAP,
 137
 138     /* A charset of this method is a subset of another charset.  */
 139     CHARSET_METHOD_SUBSET,
 140
 141     /* A charset of this method is a superset of other charsets.  */
 142     CHARSET_METHOD_SUPERSET
 143   };
 144
 145 struct charset
 146 {
 147   /* Index to charset_table.  */
 148   int id;
 149
 150   /* Index to Vcharset_hash_table.  */
 151   ptrdiff_t hash_index;
 152
 153   /* Dimension of the charset: 1, 2, 3, or 4.  */
 154   int dimension;
 155
 156   /* Byte code range of each dimension.  <code_space>[4N] is a minimum
 157      byte code of the (N+1)th dimension, <code_space>[4N+1] is a
 158      maximum byte code of the (N+1)th dimension, <code_space>[4N+2] is
 159      (<code_space>[4N+1] - <code_space>[4N] + 1), <code_space>[4N+3]
 160      is the number of characters contained in the first through (N+1)th
 161      dimensions, except that there is no <code_space>[15].
 162      We get `char-index' of a `code-point' from this
 163      information.  */
 164   int code_space[15];
 165
 166   /* If B is a byte of Nth dimension of a code-point, the (N-1)th bit
 167      of code_space_mask[B] is set.  This array is used to quickly
 168      check if a code-point is in a valid range.  */
 169   unsigned char *code_space_mask;
 170
 171   /* 1 if there's no gap in code-points.  */
 172   int code_linear_p;
 173
 174   /* If the charset is treated as 94-chars in ISO-2022, the value is 0.
 175      If the charset is treated as 96-chars in ISO-2022, the value is 1.  */
 176   int iso_chars_96;
 177
 178   /* ISO final byte of the charset: 48..127.  It may be -1 if the
 179      charset doesn't conform to ISO-2022.  */
 180   int iso_final;
 181
 182   /* ISO revision number of the charset.  */
 183   int iso_revision;
 184
 185   /* If the charset is identical to what supported by Emacs 21 and the
 186      priors, the identification number of the charset used in those
 187      version.  Otherwise, -1.  */
 188   int emacs_mule_id;
 189
 190   /* Nonzero if the charset is compatible with ASCII.  */
 191   int ascii_compatible_p;
 192
 193   /* Nonzero if the charset is supplementary.  */
 194   int supplementary_p;
 195
 196   /* Nonzero if all the code points are representable by Lisp_Int.  */
 197   int compact_codes_p;
 198
 199   /* The method for encoding/decoding characters of the charset.  */
 200   enum charset_method method;
 201
 202   /* Minimum and Maximum code points of the charset.  */
 203   unsigned min_code, max_code;
 204
 205   /* Offset value used by macros CODE_POINT_TO_INDEX and
 206       INDEX_TO_CODE_POINT. .  */
 207   unsigned char_index_offset;
 208
 209   /* Minimum and Maximum character codes of the charset.  If the
 210      charset is compatible with ASCII, min_char is a minimum non-ASCII
 211      character of the charset.  If the method of charset is
 212      CHARSET_METHOD_OFFSET, even if the charset is unified, min_char
 213      and max_char doesn't change.  */
 214   int min_char, max_char;
 215
 216   /* The code returned by ENCODE_CHAR if a character is not encodable
 217      by the charset.  */
 218   unsigned invalid_code;
 219
 220   /* If the method of the charset is CHARSET_METHOD_MAP, this is a
 221      table of bits used to quickly and roughly guess if a character
 222      belongs to the charset.
 223
 224      The first 64 elements are 512 bits for characters less than
 225      0x10000.  Each bit corresponds to 128-character block.  The last
 226      126 elements are 1008 bits for the greater characters
 227      (0x10000..0x3FFFFF).  Each bit corresponds to 4096-character
 228      block.
 229
 230      If a bit is 1, at least one character in the corresponding block is
 231      in this charset.  */
 232   unsigned char fast_map[190];
 233
 234   /* Offset value to calculate a character code from code-point, and
 235      visa versa.  */
 236   int code_offset;
 237
 238   int unified_p;
 239 };
 240
 241 /* Hash table of charset symbols vs. the corresponding attribute
 242    vectors.  */
 243 extern Lisp_Object Vcharset_hash_table;
 244
 245 /* Table of struct charset.  */
 246 extern struct charset *charset_table;
 247
 248 #define CHARSET_FROM_ID(id) (charset_table + (id))
 249
 250 extern Lisp_Object Vcharset_ordered_list;
 251 extern Lisp_Object Vcharset_non_preferred_head;
 252
 253 /* Incremented everytime we change the priority of charsets.  */
 254 extern unsigned short charset_ordered_list_tick;
 255
 256 extern Lisp_Object Viso_2022_charset_list;
 257 extern Lisp_Object Vemacs_mule_charset_list;
 258
 259 extern int emacs_mule_charset[256];
 260
 261 /* Macros to access information about charset.  */
 262
 263 /* Return the attribute vector of charset whose symbol is SYMBOL.  */
 264 #define CHARSET_SYMBOL_ATTRIBUTES(symbol)       \
 265   Fgethash ((symbol), Vcharset_hash_table, Qnil)
 266
 267 #define CHARSET_ATTR_ID(attrs)          AREF ((attrs), charset_id)
 268 #define CHARSET_ATTR_NAME(attrs)        AREF ((attrs), charset_name)
 269 #define CHARSET_ATTR_PLIST(attrs)       AREF ((attrs), charset_plist)
 270 #define CHARSET_ATTR_MAP(attrs)         AREF ((attrs), charset_map)
 271 #define CHARSET_ATTR_DECODER(attrs)     AREF ((attrs), charset_decoder)
 272 #define CHARSET_ATTR_ENCODER(attrs)     AREF ((attrs), charset_encoder)
 273 #define CHARSET_ATTR_SUBSET(attrs)      AREF ((attrs), charset_subset)
 274 #define CHARSET_ATTR_SUPERSET(attrs)    AREF ((attrs), charset_superset)
 275 #define CHARSET_ATTR_UNIFY_MAP(attrs)   AREF ((attrs), charset_unify_map)
 276 #define CHARSET_ATTR_DEUNIFIER(attrs)   AREF ((attrs), charset_deunifier)
 277
 278 #define CHARSET_SYMBOL_ID(symbol)       \
 279   CHARSET_ATTR_ID (CHARSET_SYMBOL_ATTRIBUTES (symbol))
 280
 281 /* Return an index to Vcharset_hash_table of the charset whose symbol
 282    is SYMBOL.  */
 283 #define CHARSET_SYMBOL_HASH_INDEX(symbol)       \
 284   hash_lookup (XHASH_TABLE (Vcharset_hash_table), symbol, NULL)
 285
 286 /* Return the attribute vector of CHARSET.  */
 287 #define CHARSET_ATTRIBUTES(charset)     \
 288   (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), (charset)->hash_index))
 289
 290 #define CHARSET_ID(charset)             ((charset)->id)
 291 #define CHARSET_HASH_INDEX(charset)     ((charset)->hash_index)
 292 #define CHARSET_DIMENSION(charset)      ((charset)->dimension)
 293 #define CHARSET_CODE_SPACE(charset)     ((charset)->code_space)
 294 #define CHARSET_CODE_LINEAR_P(charset)  ((charset)->code_linear_p)
 295 #define CHARSET_ISO_CHARS_96(charset)   ((charset)->iso_chars_96)
 296 #define CHARSET_ISO_FINAL(charset)      ((charset)->iso_final)
 297 #define CHARSET_ISO_PLANE(charset)      ((charset)->iso_plane)
 298 #define CHARSET_ISO_REVISION(charset)   ((charset)->iso_revision)
 299 #define CHARSET_EMACS_MULE_ID(charset)  ((charset)->emacs_mule_id)
 300 #define CHARSET_ASCII_COMPATIBLE_P(charset) ((charset)->ascii_compatible_p)
 301 #define CHARSET_COMPACT_CODES_P(charset) ((charset)->compact_codes_p)
 302 #define CHARSET_METHOD(charset)         ((charset)->method)
 303 #define CHARSET_MIN_CODE(charset)       ((charset)->min_code)
 304 #define CHARSET_MAX_CODE(charset)       ((charset)->max_code)
 305 #define CHARSET_INVALID_CODE(charset)   ((charset)->invalid_code)
 306 #define CHARSET_MIN_CHAR(charset)       ((charset)->min_char)
 307 #define CHARSET_MAX_CHAR(charset)       ((charset)->max_char)
 308 #define CHARSET_CODE_OFFSET(charset)    ((charset)->code_offset)
 309 #define CHARSET_UNIFIED_P(charset)      ((charset)->unified_p)
 310
 311 #define CHARSET_NAME(charset)           \
 312   (CHARSET_ATTR_NAME (CHARSET_ATTRIBUTES (charset)))
 313 #define CHARSET_MAP(charset)    \
 314   (CHARSET_ATTR_MAP (CHARSET_ATTRIBUTES (charset)))
 315 #define CHARSET_DECODER(charset)        \
 316   (CHARSET_ATTR_DECODER (CHARSET_ATTRIBUTES (charset)))
 317 #define CHARSET_ENCODER(charset)        \
 318   (CHARSET_ATTR_ENCODER (CHARSET_ATTRIBUTES (charset)))
 319 #define CHARSET_SUBSET(charset) \
 320   (CHARSET_ATTR_SUBSET (CHARSET_ATTRIBUTES (charset)))
 321 #define CHARSET_SUPERSET(charset)       \
 322   (CHARSET_ATTR_SUPERSET (CHARSET_ATTRIBUTES (charset)))
 323 #define CHARSET_UNIFY_MAP(charset)      \
 324   (CHARSET_ATTR_UNIFY_MAP (CHARSET_ATTRIBUTES (charset)))
 325 #define CHARSET_DEUNIFIER(charset)      \
 326   (CHARSET_ATTR_DEUNIFIER (CHARSET_ATTRIBUTES (charset)))
 327
 328
 329 /* Nonzero if OBJ is a valid charset symbol.  */
 330 #define CHARSETP(obj) (CHARSET_SYMBOL_HASH_INDEX (obj) >= 0)
 331
 332 /* Check if X is a valid charset symbol.  If not, signal an error.  */
 333 #define CHECK_CHARSET(x)                                        \
 334   do {                                                          \
 335     if (! SYMBOLP (x) || CHARSET_SYMBOL_HASH_INDEX (x) < 0)     \
 336       wrong_type_argument (Qcharsetp, (x));                     \
 337   } while (0)
 338
 339
 340 /* Check if X is a valid charset symbol.  If valid, set ID to the id
 341    number of the charset.  Otherwise, signal an error. */
 342 #define CHECK_CHARSET_GET_ID(x, id)                                     \
 343   do {                                                                  \
 344     ptrdiff_t idx;                                                      \
 345                                                                         \
 346     if (! SYMBOLP (x) || (idx = CHARSET_SYMBOL_HASH_INDEX (x)) < 0)     \
 347       wrong_type_argument (Qcharsetp, (x));                             \
 348     id = XINT (AREF (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), idx), \
 349                      charset_id));                                      \
 350   } while (0)
 351
 352
 353 /* Check if X is a valid charset symbol.  If valid, set ATTR to the
 354    attr vector of the charset.  Otherwise, signal an error. */
 355 #define CHECK_CHARSET_GET_ATTR(x, attr)                         \
 356   do {                                                                  \
 357     if (!SYMBOLP (x) || NILP (attr = CHARSET_SYMBOL_ATTRIBUTES (x)))    \
 358       wrong_type_argument (Qcharsetp, (x));                             \
 359   } while (0)
 360
 361
 362 #define CHECK_CHARSET_GET_CHARSET(x, charset)   \
 363   do {                                          \
 364     int csid;                                   \
 365     CHECK_CHARSET_GET_ID (x, csid);             \
 366     charset = CHARSET_FROM_ID (csid);           \
 367   } while (0)
 368
 369
 370 /* Lookup Vcharset_ordered_list and return the first charset that
 371    contains the character C.  */
 372 #define CHAR_CHARSET(c)                         \
 373   ((c) < 0x80 ? CHARSET_FROM_ID (charset_ascii) \
 374    : char_charset ((c), Qnil, NULL))
 375
 376 #if 0
 377 /* Char-table of charset-sets.  Each element is a bool vector indexed
 378    by a charset ID.  */
 379 extern Lisp_Object Vchar_charset_set;
 380
 381 /* Charset-bag of character C.  */
 382 #define CHAR_CHARSET_SET(c) \
 383   CHAR_TABLE_REF (Vchar_charset_set, c)
 384
 385 /* Check if two characters C1 and C2 belong to the same charset.  */
 386 #define SAME_CHARSET_P(c1, c2)  \
 387   intersection_p (CHAR_CHARSET_SET (c1), CHAR_CHARSET_SET (c2))
 388
 389 #endif
 390
 391
 392 /* Return a character corresponding to the code-point CODE of CHARSET.
 393    Try some optimization before calling decode_char.  */
 394
 395 #define DECODE_CHAR(charset, code)                                      \
 396   ((ASCII_BYTE_P (code) && (charset)->ascii_compatible_p)               \
 397    ? (code)                                                             \
 398    : ((code) < (charset)->min_code || (code) > (charset)->max_code)     \
 399    ? -1                                                                 \
 400    : (charset)->unified_p                                               \
 401    ? decode_char ((charset), (code))                                    \
 402    : (charset)->method == CHARSET_METHOD_OFFSET                         \
 403    ? ((charset)->code_linear_p                                          \
 404       ? (int) ((code) - (charset)->min_code) + (charset)->code_offset   \
 405       : decode_char ((charset), (code)))                                \
 406    : (charset)->method == CHARSET_METHOD_MAP                            \
 407    ? (((charset)->code_linear_p                                         \
 408        && VECTORP (CHARSET_DECODER (charset)))                          \
 409       ? XINT (AREF (CHARSET_DECODER (charset),                          \
 410                     (code) - (charset)->min_code))                      \
 411       : decode_char ((charset), (code)))                                \
 412    : decode_char ((charset), (code)))
 413
 414 extern Lisp_Object charset_work;
 415
 416 /* Return a code point of CHAR in CHARSET.
 417    Try some optimization before calling encode_char.  */
 418
 419 #define ENCODE_CHAR(charset, c)                                         \
 420   (verify_expr                                                          \
 421    (sizeof (c) <= sizeof (int),                                         \
 422     (ASCII_CHAR_P (c) && (charset)->ascii_compatible_p                  \
 423      ? (unsigned) (c)                                                   \
 424      : ((charset)->unified_p                                            \
 425         || (charset)->method == CHARSET_METHOD_SUBSET                   \
 426         || (charset)->method == CHARSET_METHOD_SUPERSET)                \
 427      ? encode_char (charset, c)                                         \
 428      : (c) < (charset)->min_char || (c) > (charset)->max_char           \
 429      ? (charset)->invalid_code                                          \
 430      : (charset)->method == CHARSET_METHOD_OFFSET                       \
 431      ? ((charset)->code_linear_p                                        \
 432         ? (unsigned) ((c) - (charset)->code_offset) + (charset)->min_code \
 433         : encode_char (charset, c))                                     \
 434      : (charset)->method == CHARSET_METHOD_MAP                          \
 435      ? (((charset)->compact_codes_p                                     \
 436          && CHAR_TABLE_P (CHARSET_ENCODER (charset)))                   \
 437         ? (charset_work = CHAR_TABLE_REF (CHARSET_ENCODER (charset), c), \
 438            (NILP (charset_work)                                         \
 439             ? (charset)->invalid_code                                   \
 440             : (unsigned) XFASTINT (charset_work)))                      \
 441         : encode_char (charset, c))                                     \
 442      : encode_char (charset, c))))
 443
 444
 445 /* Set to 1 when a charset map is loaded to warn that a buffer text
 446    and a string data may be relocated.  */
 447 extern int charset_map_loaded;
 448
 449
 450 /* Set CHARSET to the charset highest priority of C, CODE to the
 451    code-point of C in CHARSET.  */
 452 #define SPLIT_CHAR(c, charset, code)    \
 453   ((charset) = char_charset ((c), Qnil, &(code)))
 454
 455
 456 #define ISO_MAX_DIMENSION 3
 457 #define ISO_MAX_CHARS 2
 458 #define ISO_MAX_FINAL 0x80      /* only 0x30..0xFF are used */
 459
 460 /* Mapping table from ISO2022's charset (specified by DIMENSION,
 461    CHARS, and FINAL_CHAR) to Emacs' charset ID.  Should be accessed by
 462    macro ISO_CHARSET_TABLE (DIMENSION, CHARS, FINAL_CHAR).  */
 463 extern int iso_charset_table[ISO_MAX_DIMENSION][ISO_MAX_CHARS][ISO_MAX_FINAL];
 464
 465 /* A charset of type iso2022 who has DIMENSION, CHARS, and FINAL
 466    (final character).  */
 467 #define ISO_CHARSET_TABLE(dimension, chars_96, final)   \
 468   iso_charset_table[(dimension) - 1][(chars_96)][(final)]
 469
 470 /* Nonzero if the charset who has FAST_MAP may contain C.  */
 471 #define CHARSET_FAST_MAP_REF(c, fast_map)               \
 472   ((c) < 0x10000                                        \
 473    ? fast_map[(c) >> 10] & (1 << (((c) >> 7) & 7))      \
 474    : fast_map[((c) >> 15) + 62] & (1 << (((c) >> 12) & 7)))
 475
 476 #define CHARSET_FAST_MAP_SET(c, fast_map)                       \
 477   do {                                                          \
 478     if ((c) < 0x10000)                                          \
 479       (fast_map)[(c) >> 10] |= 1 << (((c) >> 7) & 7);           \
 480     else                                                        \
 481       (fast_map)[((c) >> 15) + 62] |= 1 << (((c) >> 12) & 7);   \
 482   } while (0)
 483
 484
 485
 486 /* 1 if CHARSET may contain the character C.  */
 487 #define CHAR_CHARSET_P(c, charset)                                       \
 488   ((ASCII_CHAR_P (c) && (charset)->ascii_compatible_p)                   \
 489    || ((CHARSET_UNIFIED_P (charset)                                      \
 490         || (charset)->method == CHARSET_METHOD_SUBSET                    \
 491         || (charset)->method == CHARSET_METHOD_SUPERSET)                 \
 492        ? encode_char ((charset), (c)) != (charset)->invalid_code         \
 493        : (CHARSET_FAST_MAP_REF ((c), (charset)->fast_map)                \
 494           && ((charset)->method == CHARSET_METHOD_OFFSET                 \
 495               ? (c) >= (charset)->min_char && (c) <= (charset)->max_char \
 496               : ((charset)->method == CHARSET_METHOD_MAP                 \
 497                  && (charset)->compact_codes_p                           \
 498                  && CHAR_TABLE_P (CHARSET_ENCODER (charset)))            \
 499               ? ! NILP (CHAR_TABLE_REF (CHARSET_ENCODER (charset), (c))) \
 500               : encode_char ((charset), (c)) != (charset)->invalid_code))))
 501
 502 \f
 503 /* Special macros for emacs-mule encoding.  */
 504
 505 /* Leading-code followed by extended leading-code.    DIMENSION/COLUMN */
 506 #define EMACS_MULE_LEADING_CODE_PRIVATE_11      0x9A /* 1/1 */
 507 #define EMACS_MULE_LEADING_CODE_PRIVATE_12      0x9B /* 1/2 */
 508 #define EMACS_MULE_LEADING_CODE_PRIVATE_21      0x9C /* 2/2 */
 509 #define EMACS_MULE_LEADING_CODE_PRIVATE_22      0x9D /* 2/2 */
 510
 511 \f
 512
 513 extern Lisp_Object Qcharsetp;
 514
 515 extern Lisp_Object Qascii;
 516 extern int charset_ascii, charset_eight_bit;
 517 extern int charset_unicode;
 518 extern int charset_jisx0201_roman;
 519 extern int charset_jisx0208_1978;
 520 extern int charset_jisx0208;
 521 extern int charset_ksc5601;
 522
 523 extern int charset_unibyte;
 524
 525 extern struct charset *char_charset (int, Lisp_Object, unsigned *);
 526 extern Lisp_Object charset_attributes (int);
 527
 528 extern int maybe_unify_char (int, Lisp_Object);
 529 extern int decode_char (struct charset *, unsigned);
 530 extern unsigned encode_char (struct charset *, int);
 531 extern int string_xstring_p (Lisp_Object);
 532
 533 extern void map_charset_chars (void (*) (Lisp_Object, Lisp_Object),
 534                                Lisp_Object, Lisp_Object,
 535                                struct charset *, unsigned, unsigned);
 536
 537 #endif /* EMACS_CHARSET_H */