code.delx.au - gnu-emacs/blob - src/coding.h

   1 /* Header for coding system handler.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007, 2008  Free Software Foundation, Inc.
   4    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   5      2005, 2006, 2007, 2008
   6      National Institute of Advanced Industrial Science and Technology (AIST)
   7      Registration Number H14PRO021
   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, or (at your option)
  17 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; see the file COPYING.  If not, write to
  26 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  27 Boston, MA 02110-1301, USA.  */
  28
  29 #ifndef EMACS_CODING_H
  30 #define EMACS_CODING_H
  31
  32 /* Index to arguments of Fdefine_coding_system_internal.  */
  33
  34 enum define_coding_system_arg_index
  35   {
  36     coding_arg_name,
  37     coding_arg_mnemonic,
  38     coding_arg_coding_type,
  39     coding_arg_charset_list,
  40     coding_arg_ascii_compatible_p,
  41     coding_arg_decode_translation_table,
  42     coding_arg_encode_translation_table,
  43     coding_arg_post_read_conversion,
  44     coding_arg_pre_write_conversion,
  45     coding_arg_default_char,
  46     coding_arg_for_unibyte,
  47     coding_arg_plist,
  48     coding_arg_eol_type,
  49     coding_arg_max
  50   };
  51
  52 enum define_coding_iso2022_arg_index
  53   {
  54     coding_arg_iso2022_initial = coding_arg_max,
  55     coding_arg_iso2022_reg_usage,
  56     coding_arg_iso2022_request,
  57     coding_arg_iso2022_flags,
  58     coding_arg_iso2022_max
  59   };
  60
  61 enum define_coding_utf16_arg_index
  62   {
  63     coding_arg_utf16_bom = coding_arg_max,
  64     coding_arg_utf16_endian,
  65     coding_arg_utf16_max
  66   };
  67
  68 enum define_coding_ccl_arg_index
  69   {
  70     coding_arg_ccl_decoder = coding_arg_max,
  71     coding_arg_ccl_encoder,
  72     coding_arg_ccl_valids,
  73     coding_arg_ccl_max
  74   };
  75
  76 /* Hash table for all coding systems.  Keys are coding system symbols
  77    and values are spec vectors of the corresponding coding system.  A
  78    spec vector has the form [ ATTRS ALIASES EOL-TYPE ].  ATTRS is a
  79    vector of attribute of the coding system.  ALIASES is a list of
  80    aliases (symbols) of the coding system.  EOL-TYPE is `unix', `dos',
  81    `mac' or a vector of coding systems (symbols).  */
  82
  83 extern Lisp_Object Vcoding_system_hash_table;
  84
  85
  86 /* Enumeration of coding system type.  */
  87
  88 enum coding_system_type
  89   {
  90     coding_type_charset,
  91     coding_type_utf_8,
  92     coding_type_utf_16,
  93     coding_type_iso_2022,
  94     coding_type_emacs_mule,
  95     coding_type_sjis,
  96     coding_type_ccl,
  97     coding_type_raw_text,
  98     coding_type_undecided,
  99     coding_type_max
 100   };
 101
 102
 103 /* Enumeration of end-of-line format type.  */
 104
 105 enum end_of_line_type
 106   {
 107     eol_lf,             /* Line-feed only, same as Emacs' internal
 108                            format.  */
 109     eol_crlf,           /* Sequence of carriage-return and
 110                            line-feed.  */
 111     eol_cr,             /* Carriage-return only.  */
 112     eol_any,            /* Accept any of above.  Produce line-feed
 113                            only.  */
 114     eol_undecided,      /* This value is used to denote that the
 115                            eol-type is not yet undecided.  */
 116     eol_type_max
 117   };
 118
 119 /* Enumeration of index to an attribute vector of a coding system.  */
 120
 121 enum coding_attr_index
 122   {
 123     coding_attr_base_name,
 124     coding_attr_docstring,
 125     coding_attr_mnemonic,
 126     coding_attr_type,
 127     coding_attr_charset_list,
 128     coding_attr_ascii_compat,
 129     coding_attr_decode_tbl,
 130     coding_attr_encode_tbl,
 131     coding_attr_trans_tbl,
 132     coding_attr_post_read,
 133     coding_attr_pre_write,
 134     coding_attr_default_char,
 135     coding_attr_for_unibyte,
 136     coding_attr_plist,
 137
 138     coding_attr_category,
 139     coding_attr_safe_charsets,
 140
 141     /* The followings are extra attributes for each type.  */
 142     coding_attr_charset_valids,
 143
 144     coding_attr_ccl_decoder,
 145     coding_attr_ccl_encoder,
 146     coding_attr_ccl_valids,
 147
 148     coding_attr_iso_initial,
 149     coding_attr_iso_usage,
 150     coding_attr_iso_request,
 151     coding_attr_iso_flags,
 152
 153     coding_attr_utf_16_bom,
 154     coding_attr_utf_16_endian,
 155
 156     coding_attr_emacs_mule_full,
 157
 158     coding_attr_last_index
 159   };
 160
 161
 162 /* Macros to access an element of an attribute vector.  */
 163
 164 #define CODING_ATTR_BASE_NAME(attrs)    AREF (attrs, coding_attr_base_name)
 165 #define CODING_ATTR_TYPE(attrs)         AREF (attrs, coding_attr_type)
 166 #define CODING_ATTR_CHARSET_LIST(attrs) AREF (attrs, coding_attr_charset_list)
 167 #define CODING_ATTR_MNEMONIC(attrs)     AREF (attrs, coding_attr_mnemonic)
 168 #define CODING_ATTR_DOCSTRING(attrs)    AREF (attrs, coding_attr_docstring)
 169 #define CODING_ATTR_ASCII_COMPAT(attrs) AREF (attrs, coding_attr_ascii_compat)
 170 #define CODING_ATTR_DECODE_TBL(attrs)   AREF (attrs, coding_attr_decode_tbl)
 171 #define CODING_ATTR_ENCODE_TBL(attrs)   AREF (attrs, coding_attr_encode_tbl)
 172 #define CODING_ATTR_TRANS_TBL(attrs)    AREF (attrs, coding_attr_trans_tbl)
 173 #define CODING_ATTR_POST_READ(attrs)    AREF (attrs, coding_attr_post_read)
 174 #define CODING_ATTR_PRE_WRITE(attrs)    AREF (attrs, coding_attr_pre_write)
 175 #define CODING_ATTR_DEFAULT_CHAR(attrs) AREF (attrs, coding_attr_default_char)
 176 #define CODING_ATTR_FOR_UNIBYTE(attrs)  AREF (attrs, coding_attr_for_unibyte)
 177 #define CODING_ATTR_FLUSHING(attrs)     AREF (attrs, coding_attr_flushing)
 178 #define CODING_ATTR_PLIST(attrs)        AREF (attrs, coding_attr_plist)
 179 #define CODING_ATTR_CATEGORY(attrs)     AREF (attrs, coding_attr_category)
 180 #define CODING_ATTR_SAFE_CHARSETS(attrs)AREF (attrs, coding_attr_safe_charsets)
 181
 182
 183 /* Return the name of a coding system specified by ID.  */
 184 #define CODING_ID_NAME(id) \
 185   (HASH_KEY (XHASH_TABLE (Vcoding_system_hash_table), id))
 186
 187 /* Return the attribute vector of a coding system specified by ID.  */
 188
 189 #define CODING_ID_ATTRS(id)     \
 190   (AREF (HASH_VALUE (XHASH_TABLE (Vcoding_system_hash_table), id), 0))
 191
 192 /* Return the list of aliases of a coding system specified by ID.  */
 193
 194 #define CODING_ID_ALIASES(id)   \
 195   (AREF (HASH_VALUE (XHASH_TABLE (Vcoding_system_hash_table), id), 1))
 196
 197 /* Return the eol-type of a coding system specified by ID.  */
 198
 199 #define CODING_ID_EOL_TYPE(id)  \
 200   (AREF (HASH_VALUE (XHASH_TABLE (Vcoding_system_hash_table), id), 2))
 201
 202
 203 /* Return the spec vector of CODING_SYSTEM_SYMBOL.  */
 204
 205 #define CODING_SYSTEM_SPEC(coding_system_symbol)        \
 206   (Fgethash (coding_system_symbol, Vcoding_system_hash_table, Qnil))
 207
 208
 209 /* Return the ID of CODING_SYSTEM_SYMBOL.  */
 210
 211 #define CODING_SYSTEM_ID(coding_system_symbol)                  \
 212   hash_lookup (XHASH_TABLE (Vcoding_system_hash_table),         \
 213                coding_system_symbol, NULL)
 214
 215 /* Return 1 if CODING_SYSTEM_SYMBOL is a coding system.  */
 216
 217 #define CODING_SYSTEM_P(coding_system_symbol)           \
 218   (CODING_SYSTEM_ID (coding_system_symbol) >= 0         \
 219    || (! NILP (coding_system_symbol)                    \
 220        && ! NILP (Fcoding_system_p (coding_system_symbol))))
 221
 222 /* Check if X is a coding system or not.  */
 223
 224 #define CHECK_CODING_SYSTEM(x)                          \
 225   do {                                                  \
 226     if (CODING_SYSTEM_ID (x) < 0                        \
 227         && NILP (Fcheck_coding_system (x)))             \
 228       wrong_type_argument (Qcoding_system_p, (x));      \
 229   } while (0)
 230
 231
 232 /* Check if X is a coding system or not.  If it is, set SEPC to the
 233    spec vector of the coding system.  */
 234
 235 #define CHECK_CODING_SYSTEM_GET_SPEC(x, spec)           \
 236   do {                                                  \
 237     spec = CODING_SYSTEM_SPEC (x);                      \
 238     if (NILP (spec))                                    \
 239       {                                                 \
 240         Fcheck_coding_system (x);                       \
 241         spec = CODING_SYSTEM_SPEC (x);                  \
 242       }                                                 \
 243     if (NILP (spec))                                    \
 244       x = wrong_type_argument (Qcoding_system_p, (x));  \
 245   } while (0)
 246
 247
 248 /* Check if X is a coding system or not.  If it is, set ID to the
 249    ID of the coding system.  */
 250
 251 #define CHECK_CODING_SYSTEM_GET_ID(x, id)                       \
 252   do                                                            \
 253     {                                                           \
 254       id = CODING_SYSTEM_ID (x);                                \
 255       if (id < 0)                                               \
 256         {                                                       \
 257           Fcheck_coding_system (x);                             \
 258           id = CODING_SYSTEM_ID (x);                            \
 259         }                                                       \
 260       if (id < 0)                                               \
 261         x = wrong_type_argument (Qcoding_system_p, (x));        \
 262     } while (0)
 263
 264
 265 /*** GENERAL section ***/
 266
 267 /* Enumeration of result code of code conversion.  */
 268 enum coding_result_code
 269   {
 270     CODING_RESULT_SUCCESS,
 271     CODING_RESULT_INSUFFICIENT_SRC,
 272     CODING_RESULT_INSUFFICIENT_DST,
 273     CODING_RESULT_INCONSISTENT_EOL,
 274     CODING_RESULT_INVALID_SRC,
 275     CODING_RESULT_INTERRUPT,
 276     CODING_RESULT_INSUFFICIENT_MEM
 277   };
 278
 279
 280 /* Macros used for the member `mode' of the struct coding_system.  */
 281
 282 /* If set, recover the original CR or LF of the already decoded text
 283    when the decoding routine encounters an inconsistent eol format.  */
 284 #define CODING_MODE_INHIBIT_INCONSISTENT_EOL    0x01
 285
 286 /* If set, the decoding/encoding routines treat the current data as
 287    the last block of the whole text to be converted, and do the
 288    appropriate finishing job.  */
 289 #define CODING_MODE_LAST_BLOCK                  0x02
 290
 291 /* If set, it means that the current source text is in a buffer which
 292    enables selective display.  */
 293 #define CODING_MODE_SELECTIVE_DISPLAY           0x04
 294
 295 /* This flag is used by the decoding/encoding routines on the fly.  If
 296    set, it means that right-to-left text is being processed.  */
 297 #define CODING_MODE_DIRECTION                   0x08
 298
 299 #define CODING_MODE_FIXED_DESTINATION           0x10
 300
 301 /* If set, it means that the encoding routines produces some safe
 302    ASCII characters (usually '?') for unsupported characters.  */
 303 #define CODING_MODE_SAFE_ENCODING               0x20
 304
 305 /* Structure of the field `spec.iso_2022' in the structure
 306    `coding_system'.  */
 307 struct iso_2022_spec
 308 {
 309   /* Bit-wise-or of CODING_ISO_FLAG_XXX.  */
 310   unsigned flags;
 311
 312   /* The current graphic register invoked to each graphic plane.  */
 313   int current_invocation[2];
 314
 315   /* The current charset designated to each graphic register.  The
 316      value -1 means that not charset is designated, -2 means that
 317      there was an invalid designation previously.  */
 318   int current_designation[4];
 319
 320   /* Set to 1 temporarily only when graphic register 2 or 3 is invoked
 321      by single-shift while encoding.  */
 322   int single_shifting;
 323
 324   /* Set to 1 temporarily only when processing at beginning of line.  */
 325   int bol;
 326 };
 327
 328 struct ccl_spec;
 329
 330 enum utf_16_bom_type
 331   {
 332     utf_16_detect_bom,
 333     utf_16_without_bom,
 334     utf_16_with_bom
 335   };
 336
 337 enum utf_16_endian_type
 338   {
 339     utf_16_big_endian,
 340     utf_16_little_endian
 341   };
 342
 343 struct utf_16_spec
 344 {
 345   enum utf_16_bom_type bom;
 346   enum utf_16_endian_type endian;
 347   int surrogate;
 348 };
 349
 350 struct coding_detection_info
 351 {
 352   /* Values of these members are bitwise-OR of CATEGORY_MASK_XXXs.  */
 353   /* Which categories are already checked.  */
 354   int checked;
 355   /* Which categories are strongly found.  */
 356   int found;
 357   /* Which categories are rejected.  */
 358   int rejected;
 359 };
 360
 361
 362 struct coding_system
 363 {
 364   /* ID number of the coding system.  This is an index to
 365      Vcoding_system_hash_table.  This value is set by
 366      setup_coding_system.  At the early stage of building time, this
 367      value is -1 in the array coding_categories to indicate that no
 368      coding-system of that category is yet defined.  */
 369   int id;
 370
 371   /* Flag bits of the coding system.  The meaning of each bit is common
 372      to all types of coding systems.  */
 373   int common_flags;
 374
 375   /* Mode bits of the coding system.  See the comments of the macros
 376      CODING_MODE_XXX.  */
 377   unsigned int mode;
 378
 379   /* Detailed information specific to each type of coding system.  */
 380   union
 381     {
 382       struct iso_2022_spec iso_2022;
 383       struct ccl_spec *ccl;     /* Defined in ccl.h.  */
 384       struct utf_16_spec utf_16;
 385       int emacs_mule_full_support;
 386     } spec;
 387
 388   int max_charset_id;
 389   char *safe_charsets;
 390
 391   /* The following two members specify how binary 8-bit code 128..255
 392      are represented in source and destination text respectively.  1
 393      means they are represented by 2-byte sequence, 0 means they are
 394      represented by 1-byte as is (see the comment in character.h).  */
 395   unsigned src_multibyte : 1;
 396   unsigned dst_multibyte : 1;
 397
 398   /* How may heading bytes we can skip for decoding.  This is set to
 399      -1 in setup_coding_system, and updated by detect_coding.  So,
 400      when this is equal to the byte length of the text being
 401      converted, we can skip the actual conversion process.  */
 402   int head_ascii;
 403
 404   /* The following members are set by encoding/decoding routine.  */
 405   EMACS_INT produced, produced_char, consumed, consumed_char;
 406
 407   /* Number of error source data found in a decoding routine.  */
 408   int errors;
 409
 410   /* Store the positions of error source data. */
 411   EMACS_INT *error_positions;
 412
 413   /* Finish status of code conversion.  */
 414   enum coding_result_code result;
 415
 416   EMACS_INT src_pos, src_pos_byte, src_chars, src_bytes;
 417   Lisp_Object src_object;
 418   const unsigned char *source;
 419
 420   EMACS_INT dst_pos, dst_pos_byte, dst_bytes;
 421   Lisp_Object dst_object;
 422   unsigned char *destination;
 423
 424   /* Set to 1 if the source of conversion is not in the member
 425      `charbuf', but at `src_object'.  */
 426   int chars_at_source;
 427
 428   /* If an element is non-negative, it is a character code.
 429
 430      If it is in the range -128..-1, it is a 8-bit character code
 431      minus 256.
 432
 433      If it is less than -128, it specifies the start of an annotation
 434      chunk.  The length of the chunk is -128 minus the value of the
 435      element.  The following elements are OFFSET, ANNOTATION-TYPE, and
 436      a sequence of actual data for the annotation.  OFFSET is a
 437      character position offset from dst_pos or src_pos,
 438      ANNOTATION-TYPE specfies the meaning of the annotation and how to
 439      handle the following data..  */
 440   int *charbuf;
 441   int charbuf_size, charbuf_used;
 442
 443   /* Set to 1 if charbuf contains an annotation.  */
 444   int annotated;
 445
 446   unsigned char carryover[64];
 447   int carryover_bytes;
 448
 449   int default_char;
 450
 451   int (*detector) P_ ((struct coding_system *,
 452                        struct coding_detection_info *));
 453   void (*decoder) P_ ((struct coding_system *));
 454   int (*encoder) P_ ((struct coding_system *));
 455 };
 456
 457 /* Meanings of bits in the member `common_flags' of the structure
 458    coding_system.  The lowest 8 bits are reserved for various kind of
 459    annotations (currently two of them are used).  */
 460 #define CODING_ANNOTATION_MASK                  0x00FF
 461 #define CODING_ANNOTATE_COMPOSITION_MASK        0x0001
 462 #define CODING_ANNOTATE_DIRECTION_MASK          0x0002
 463 #define CODING_ANNOTATE_CHARSET_MASK            0x0003
 464 #define CODING_FOR_UNIBYTE_MASK                 0x0100
 465 #define CODING_REQUIRE_FLUSHING_MASK            0x0200
 466 #define CODING_REQUIRE_DECODING_MASK            0x0400
 467 #define CODING_REQUIRE_ENCODING_MASK            0x0800
 468 #define CODING_REQUIRE_DETECTION_MASK           0x1000
 469 #define CODING_RESET_AT_BOL_MASK                0x2000
 470
 471 /* Return 1 if the coding context CODING requires annotaion
 472    handling.  */
 473 #define CODING_REQUIRE_ANNOTATION(coding) \
 474   ((coding)->common_flags & CODING_ANNOTATION_MASK)
 475
 476 /* Return 1 if the coding context CODING prefers decoding into unibyte.  */
 477 #define CODING_FOR_UNIBYTE(coding) \
 478   ((coding)->common_flags & CODING_FOR_UNIBYTE_MASK)
 479
 480 /* Return 1 if the coding context CODING requires specific code to be
 481    attached at the tail of converted text.  */
 482 #define CODING_REQUIRE_FLUSHING(coding) \
 483   ((coding)->common_flags & CODING_REQUIRE_FLUSHING_MASK)
 484
 485 /* Return 1 if the coding context CODING requires code conversion on
 486    decoding.  */
 487 #define CODING_REQUIRE_DECODING(coding) \
 488   ((coding)->dst_multibyte              \
 489    || (coding)->common_flags & CODING_REQUIRE_DECODING_MASK)
 490
 491
 492 /* Return 1 if the coding context CODING requires code conversion on
 493    encoding.
 494    The non-multibyte part of the condition is to support encoding of
 495    unibyte strings/buffers generated by string-as-unibyte or
 496    (set-buffer-multibyte nil) from multibyte strings/buffers.  */
 497 #define CODING_REQUIRE_ENCODING(coding)                         \
 498   ((coding)->src_multibyte                                      \
 499    || (coding)->common_flags & CODING_REQUIRE_ENCODING_MASK     \
 500    || (coding)->mode & CODING_MODE_SELECTIVE_DISPLAY)
 501
 502
 503 /* Return 1 if the coding context CODING requires some kind of code
 504    detection.  */
 505 #define CODING_REQUIRE_DETECTION(coding) \
 506   ((coding)->common_flags & CODING_REQUIRE_DETECTION_MASK)
 507
 508 /* Return 1 if the coding context CODING requires code conversion on
 509    decoding or some kind of code detection.  */
 510 #define CODING_MAY_REQUIRE_DECODING(coding)     \
 511   (CODING_REQUIRE_DECODING (coding)             \
 512    || CODING_REQUIRE_DETECTION (coding))
 513
 514 /* Macros to decode or encode a character of JISX0208 in SJIS.  S1 and
 515    S2 are the 1st and 2nd position-codes of JISX0208 in SJIS coding
 516    system.  C1 and C2 are the 1st and 2nd position codes of Emacs'
 517    internal format.  */
 518
 519 #define SJIS_TO_JIS(code)                               \
 520   do {                                                  \
 521     int s1, s2, j1, j2;                                 \
 522                                                         \
 523     s1 = (code) >> 8, s2 = (code) & 0xFF;               \
 524                                                         \
 525     if (s2 >= 0x9F)                                     \
 526       (j1 = s1 * 2 - (s1 >= 0xE0 ? 0x160 : 0xE0),       \
 527        j2 = s2 - 0x7E);                                 \
 528     else                                                \
 529       (j1 = s1 * 2 - ((s1 >= 0xE0) ? 0x161 : 0xE1),     \
 530        j2 = s2 - ((s2 >= 0x7F) ? 0x20 : 0x1F));         \
 531     (code) = (j1 << 8) | j2;                            \
 532   } while (0)
 533
 534 #define SJIS_TO_JIS2(code)                              \
 535   do {                                                  \
 536     int s1, s2, j1, j2;                                 \
 537                                                         \
 538     s1 = (code) >> 8, s2 = (code) & 0xFF;               \
 539                                                         \
 540     if (s2 >= 0x9F)                                     \
 541       {                                                 \
 542         j1 = (s1 == 0xF0 ? 0x28                         \
 543               : s1 == 0xF1 ? 0x24                       \
 544               : s1 == 0xF2 ? 0x2C                       \
 545               : s1 == 0xF3 ? 0x2E                       \
 546               : 0x6E + (s1 - 0xF4) * 2);                \
 547         j2 = s2 - 0x7E;                                 \
 548       }                                                 \
 549     else                                                \
 550       {                                                 \
 551         j1 = (s1 <= 0xF2 ? 0x21 + (s1 - 0xF0) * 2       \
 552               : s1 <= 0xF4 ? 0x2D + (s1 - 0xF3) * 2     \
 553               : 0x6F + (s1 - 0xF5) * 2);                \
 554         j2 = s2 - ((s2 >= 0x7F ? 0x20 : 0x1F));         \
 555       }                                                 \
 556     (code) = (j1 << 8) | j2;                            \
 557   } while (0)
 558
 559
 560 #define JIS_TO_SJIS(code)                               \
 561   do {                                                  \
 562     int s1, s2, j1, j2;                                 \
 563                                                         \
 564     j1 = (code) >> 8, j2 = (code) & 0xFF;               \
 565     if (j1 & 1)                                         \
 566       (s1 = j1 / 2 + ((j1 < 0x5F) ? 0x71 : 0xB1),       \
 567        s2 = j2 + ((j2 >= 0x60) ? 0x20 : 0x1F));         \
 568     else                                                \
 569       (s1 = j1 / 2 + ((j1 < 0x5F) ? 0x70 : 0xB0),       \
 570        s2 = j2 + 0x7E);                                 \
 571     (code) = (s1 << 8) | s2;                            \
 572   } while (0)
 573
 574 #define JIS_TO_SJIS2(code)                              \
 575   do {                                                  \
 576     int s1, s2, j1, j2;                                 \
 577                                                         \
 578     j1 = (code) >> 8, j2 = (code) & 0xFF;               \
 579     if (j1 & 1)                                         \
 580       {                                                 \
 581         s1 = (j1 <= 0x25 ? 0xF0 + (j1 - 0x21) / 2       \
 582               : j1 <= 0x27 ? 0xF3 + (j1 - 0x2D) / 2     \
 583               : 0xF5 + (j1 - 0x6F) / 2);                \
 584         s2 = j2 + ((j2 >= 0x60) ? 0x20 : 0x1F);         \
 585       }                                                 \
 586     else                                                \
 587       {                                                 \
 588         s1 = (j1 == 0x28 ? 0xF0                         \
 589               : j1 == 0x24 ? 0xF1                       \
 590               : j1 == 0x2C ? 0xF2                       \
 591               : j1 == 0x2E ? 0xF3                       \
 592               : 0xF4 + (j1 - 0x6E) / 2);                \
 593         s2 = j2 + 0x7E;                                 \
 594       }                                                 \
 595     (code) = (s1 << 8) | s2;                            \
 596   } while (0)
 597
 598 /* Encode the file name NAME using the specified coding system
 599    for file names, if any.  */
 600 #define ENCODE_FILE(name)                                                  \
 601   (! NILP (Vfile_name_coding_system)                                       \
 602    && !EQ (Vfile_name_coding_system, make_number (0))                      \
 603    ? code_convert_string_norecord (name, Vfile_name_coding_system, 1)      \
 604    : (! NILP (Vdefault_file_name_coding_system)                            \
 605       && !EQ (Vdefault_file_name_coding_system, make_number (0))           \
 606       ? code_convert_string_norecord (name, Vdefault_file_name_coding_system, 1) \
 607       : name))
 608
 609
 610 /* Decode the file name NAME using the specified coding system
 611    for file names, if any.  */
 612 #define DECODE_FILE(name)                                                  \
 613   (! NILP (Vfile_name_coding_system)                                       \
 614    && !EQ (Vfile_name_coding_system, make_number (0))                      \
 615    ? code_convert_string_norecord (name, Vfile_name_coding_system, 0)      \
 616    : (! NILP (Vdefault_file_name_coding_system)                            \
 617       && !EQ (Vdefault_file_name_coding_system, make_number (0))           \
 618       ? code_convert_string_norecord (name, Vdefault_file_name_coding_system, 0) \
 619       : name))
 620
 621
 622 /* Encode the string STR using the specified coding system
 623    for system functions, if any.  */
 624 #define ENCODE_SYSTEM(str)                                                 \
 625   (! NILP (Vlocale_coding_system)                                          \
 626    && !EQ (Vlocale_coding_system, make_number (0))                         \
 627    ? code_convert_string_norecord (str, Vlocale_coding_system, 1)          \
 628    : str)
 629
 630 /* Decode the string STR using the specified coding system
 631    for system functions, if any.  */
 632 #define DECODE_SYSTEM(str)                                                 \
 633   (! NILP (Vlocale_coding_system)                                          \
 634    && !EQ (Vlocale_coding_system, make_number (0))                         \
 635    ? code_convert_string_norecord (str, Vlocale_coding_system, 0)          \
 636    : str)
 637
 638 /* Used by the gtk menu code.  Note that this encodes utf-8, not
 639    utf-8-emacs, so it's not a no-op.  */
 640 #define ENCODE_UTF_8(str) code_convert_string_norecord (str, Qutf_8, 1)
 641
 642 /* Extern declarations.  */
 643 extern Lisp_Object code_conversion_save P_ ((int, int));
 644 extern int decoding_buffer_size P_ ((struct coding_system *, int));
 645 extern int encoding_buffer_size P_ ((struct coding_system *, int));
 646 extern void setup_coding_system P_ ((Lisp_Object, struct coding_system *));
 647 extern Lisp_Object coding_charset_list P_ ((struct coding_system *));
 648 extern void detect_coding P_ ((struct coding_system *));
 649 extern Lisp_Object code_convert_region P_ ((Lisp_Object, Lisp_Object,
 650                                             Lisp_Object, Lisp_Object,
 651                                             int, int));
 652 extern Lisp_Object code_convert_string P_ ((Lisp_Object, Lisp_Object,
 653                                             Lisp_Object, int, int, int));
 654 extern Lisp_Object code_convert_string_norecord P_ ((Lisp_Object, Lisp_Object,
 655                                                      int));
 656 extern Lisp_Object raw_text_coding_system P_ ((Lisp_Object));
 657 extern Lisp_Object coding_inherit_eol_type P_ ((Lisp_Object, Lisp_Object));
 658
 659 extern int decode_coding_gap P_ ((struct coding_system *,
 660                                   EMACS_INT, EMACS_INT));
 661 extern int encode_coding_gap P_ ((struct coding_system *,
 662                                   EMACS_INT, EMACS_INT));
 663 extern void decode_coding_object P_ ((struct coding_system *,
 664                                       Lisp_Object, EMACS_INT, EMACS_INT,
 665                                       EMACS_INT, EMACS_INT, Lisp_Object));
 666 extern void encode_coding_object P_ ((struct coding_system *,
 667                                       Lisp_Object, EMACS_INT, EMACS_INT,
 668                                       EMACS_INT, EMACS_INT, Lisp_Object));
 669
 670 /* Macros for backward compatibility.  */
 671
 672 #define decode_coding_region(coding, from, to)          \
 673   decode_coding_object (coding, Fcurrent_buffer (),     \
 674                         from, CHAR_TO_BYTE (from),      \
 675                         to, CHAR_TO_BYTE (to), Fcurrent_buffer ())
 676
 677
 678 #define encode_coding_region(coding, from, to)          \
 679   encode_coding_object (coding, Fcurrent_buffer (),     \
 680                         from, CHAR_TO_BYTE (from),      \
 681                         to, CHAR_TO_BYTE (to), Fcurrent_buffer ())
 682
 683
 684 #define decode_coding_string(coding, string, nocopy)                    \
 685   decode_coding_object (coding, string, 0, 0, XSTRING (string)->size,   \
 686                         STRING_BYTES (XSTRING (string)), Qt)
 687
 688 #define encode_coding_string(coding, string, nocopy)                    \
 689   (encode_coding_object (coding, string, 0, 0, XSTRING (string)->size,  \
 690                          STRING_BYTES (XSTRING (string)), Qt),          \
 691    (coding)->dst_object)
 692
 693
 694 #define decode_coding_c_string(coding, src, bytes, dst_object)          \
 695   do {                                                                  \
 696     (coding)->source = (src);                                           \
 697     (coding)->src_chars = (coding)->src_bytes = (bytes);                \
 698     decode_coding_object ((coding), Qnil, 0, 0, (bytes), (bytes),       \
 699                           (dst_object));                                \
 700   } while (0)
 701
 702
 703 extern Lisp_Object preferred_coding_system P_ (());
 704
 705
 706 extern Lisp_Object Qutf_8, Qutf_8_emacs;
 707
 708 extern Lisp_Object Qcoding_system, Qeol_type, Qcoding_category_index;
 709 extern Lisp_Object Qcoding_system_p;
 710 extern Lisp_Object Qraw_text, Qemacs_mule, Qno_conversion, Qundecided;
 711 extern Lisp_Object Qiso_2022;
 712 extern Lisp_Object Qbuffer_file_coding_system;
 713
 714 extern Lisp_Object Qunix, Qdos, Qmac;
 715
 716 extern Lisp_Object Qtranslation_table;
 717 extern Lisp_Object Qtranslation_table_id;
 718
 719 /* Mnemonic strings to indicate each type of end-of-line.  */
 720 extern Lisp_Object eol_mnemonic_unix, eol_mnemonic_dos, eol_mnemonic_mac;
 721 /* Mnemonic string to indicate type of end-of-line is not yet decided.  */
 722 extern Lisp_Object eol_mnemonic_undecided;
 723
 724 #ifdef emacs
 725 extern Lisp_Object Qfile_coding_system;
 726 extern Lisp_Object Qcall_process, Qcall_process_region;
 727 extern Lisp_Object Qstart_process, Qopen_network_stream;
 728 extern Lisp_Object Qwrite_region;
 729
 730 extern char *emacs_strerror P_ ((int));
 731
 732 /* Coding-system for reading files and receiving data from process.  */
 733 extern Lisp_Object Vcoding_system_for_read;
 734 /* Coding-system for writing files and sending data to process.  */
 735 extern Lisp_Object Vcoding_system_for_write;
 736 /* Coding-system actually used in the latest I/O.  */
 737 extern Lisp_Object Vlast_coding_system_used;
 738 /* Coding-system to use with system messages (e.g. strerror).  */
 739 extern Lisp_Object Vlocale_coding_system;
 740
 741 /* If non-zero, process buffer inherits the coding system used to decode
 742    the subprocess output.  */
 743 extern int inherit_process_coding_system;
 744
 745 /* Coding system to be used to encode text for terminal display when
 746    terminal coding system is nil.  */
 747 extern struct coding_system safe_terminal_coding;
 748
 749 /* Default coding systems used for process I/O.  */
 750 extern Lisp_Object Vdefault_process_coding_system;
 751
 752 /* Function to call to force a user to force select a propert coding
 753    system.  */
 754 extern Lisp_Object Vselect_safe_coding_system_function;
 755
 756 /* If nonzero, on writing a file, Vselect_safe_coding_system_function
 757    is called even if Vcoding_system_for_write is non-nil.  */
 758 extern int coding_system_require_warning;
 759
 760 /* Coding system for file names, or nil if none.  */
 761 extern Lisp_Object Vfile_name_coding_system;
 762
 763 /* Coding system for file names used only when
 764    Vfile_name_coding_system is nil.  */
 765 extern Lisp_Object Vdefault_file_name_coding_system;
 766
 767 #endif
 768
 769 /* Error signaled when there's a problem with detecting coding system */
 770 extern Lisp_Object Qcoding_system_error;
 771
 772 extern char emacs_mule_bytes[256];
 773 extern int emacs_mule_string_char P_ ((unsigned char *));
 774
 775 #endif /* EMACS_CODING_H */
 776
 777 /* arch-tag: 2bc3b4fa-6870-4f64-8135-b962b2d290e4
 778    (do not change this comment) */