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1 | /* Header for coding system handler. |
2 | Ver.1.0 | |
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3 | Copyright (C) 1995 Free Software Foundation, Inc. |
4 | Copyright (C) 1995 Electrotechnical Laboratory, JAPAN. | |
5 | ||
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6 | This file is part of GNU Emacs. |
7 | ||
8 | GNU Emacs is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
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13 | GNU Emacs is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
4ed46869 | 17 | |
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18 | You should have received a copy of the GNU General Public License |
19 | along with GNU Emacs; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
4ed46869 KH |
22 | |
23 | #ifndef _CODING_H | |
24 | #define _CODING_H | |
25 | ||
26 | #ifndef _CCL_H | |
27 | #include "../src/ccl.h" | |
28 | #endif | |
29 | ||
30 | /*** EMACS' INTERNAL FORMAT section ***/ | |
31 | ||
32 | /* All code (1-byte) of Emacs' internal format is classified into one | |
33 | of the followings. See also `charset.h'. */ | |
34 | enum emacs_code_class_type | |
35 | { | |
36 | EMACS_control_code, /* Control codes in the range | |
37 | 0x00..0x1F and 0x7F except for the | |
38 | following two codes. */ | |
39 | EMACS_linefeed_code, /* 0x0A (linefeed) to denote | |
40 | end-of-line. */ | |
41 | EMACS_carriage_return_code, /* 0x0D (carriage-return) to be used | |
42 | in selective display mode. */ | |
43 | EMACS_ascii_code, /* ASCII characters. */ | |
44 | EMACS_leading_code_composition, /* Leading code of a composite | |
45 | character. */ | |
46 | EMACS_leading_code_2, /* Base leading code of official | |
47 | TYPE9N character. */ | |
48 | EMACS_leading_code_3, /* Base leading code of private TYPE9N | |
49 | or official TYPE9Nx9N character. */ | |
50 | EMACS_leading_code_4, /* Base leading code of private | |
51 | TYPE9Nx9N character. */ | |
52 | EMACS_invalid_code /* Invalid code, i.e. a base leading | |
53 | code not yet assigned to any | |
54 | charset, or a code of the range | |
55 | 0xA0..0xFF. */ | |
56 | }; | |
57 | ||
58 | extern enum emacs_code_class_type emacs_code_class[256]; | |
59 | ||
60 | /*** ISO2022 section ***/ | |
61 | ||
62 | /* Macros to define code of control characters for ISO2022's functions. */ | |
63 | /* code */ /* function */ | |
64 | #define ISO_CODE_LF 0x0A /* line-feed */ | |
65 | #define ISO_CODE_CR 0x0D /* carriage-return */ | |
66 | #define ISO_CODE_SO 0x0E /* shift-out */ | |
67 | #define ISO_CODE_SI 0x0F /* shift-in */ | |
68 | #define ISO_CODE_SS2_7 0x19 /* single-shift-2 for 7-bit code */ | |
69 | #define ISO_CODE_ESC 0x1B /* escape */ | |
70 | #define ISO_CODE_SS2 0x8E /* single-shift-2 */ | |
71 | #define ISO_CODE_SS3 0x8F /* single-shift-3 */ | |
72 | #define ISO_CODE_CSI 0x9B /* control-sequence-introduce */ | |
73 | ||
74 | /* All code (1-byte) of ISO2022 is classified into one of the | |
75 | followings. */ | |
76 | enum iso_code_class_type | |
77 | { | |
78 | ISO_control_code, /* Control codes in the range | |
79 | 0x00..0x1F, 0x7F, and 0x80..0x9F, | |
80 | except for the following seven | |
81 | codes. */ | |
82 | ISO_carriage_return, /* ISO_CODE_CR (0x0D) */ | |
83 | ISO_shift_out, /* ISO_CODE_SO (0x0E) */ | |
84 | ISO_shift_in, /* ISO_CODE_SI (0x0F) */ | |
85 | ISO_single_shift_2_7, /* ISO_CODE_SS2_7 (0x19) */ | |
86 | ISO_escape, /* ISO_CODE_SO (0x1B) */ | |
87 | ISO_single_shift_2, /* ISO_CODE_SS2 (0x8E) */ | |
88 | ISO_single_shift_3, /* ISO_CODE_SS3 (0x8F) */ | |
89 | ISO_control_sequence_introducer, /* ISO_CODE_CSI (0x9B) */ | |
90 | ISO_0x20_or_0x7F, /* Codes of the values 0x20 or 0x7F. */ | |
91 | ISO_graphic_plane_0, /* Graphic codes in the range 0x21..0x7E. */ | |
92 | ISO_0xA0_or_0xFF, /* Codes of the values 0xA0 or 0xFF. */ | |
93 | ISO_graphic_plane_1 /* Graphic codes in the range 0xA1..0xFE. */ | |
94 | }; | |
95 | ||
96 | /** The macros CODING_FLAG_ISO_XXX defines a flag bit of the `flags' | |
97 | element in the structure `coding_system'. This information is used | |
98 | while encoding a text to ISO2022. **/ | |
99 | ||
100 | /* If set, produce short-form designation sequence (e.g. ESC $ A) | |
101 | instead of long-form sequence (e.g. ESC $ ( A). */ | |
102 | #define CODING_FLAG_ISO_SHORT_FORM 0x0001 | |
103 | ||
104 | /* If set, reset graphic planes and registers at end-of-line to the | |
105 | initial state. */ | |
106 | #define CODING_FLAG_ISO_RESET_AT_EOL 0x0002 | |
107 | ||
108 | /* If set, reset graphic planes and registers before any control | |
109 | characters to the initial state. */ | |
110 | #define CODING_FLAG_ISO_RESET_AT_CNTL 0x0004 | |
111 | ||
112 | /* If set, encode by 7-bit environment. */ | |
113 | #define CODING_FLAG_ISO_SEVEN_BITS 0x0008 | |
114 | ||
115 | /* If set, use locking-shift function. */ | |
116 | #define CODING_FLAG_ISO_LOCKING_SHIFT 0x0010 | |
117 | ||
118 | /* If set, use single-shift function. Overwrite | |
119 | CODING_FLAG_ISO_LOCKING_SHIFT. */ | |
120 | #define CODING_FLAG_ISO_SINGLE_SHIFT 0x0020 | |
121 | ||
122 | /* If set, designate JISX0201-Roman instead of ASCII. */ | |
123 | #define CODING_FLAG_ISO_USE_ROMAN 0x0040 | |
124 | ||
125 | /* If set, designate JISX0208-1978 instead of JISX0208-1983. */ | |
126 | #define CODING_FLAG_ISO_USE_OLDJIS 0x0080 | |
127 | ||
128 | /* If set, do not produce ISO6429's direction specifying sequence. */ | |
129 | #define CODING_FLAG_ISO_NO_DIRECTION 0x0100 | |
130 | ||
131 | /* Structure of the field `spec.iso2022' in the structure `coding_system'. */ | |
132 | struct iso2022_spec | |
133 | { | |
134 | /* The current graphic register invoked to each graphic plane. */ | |
135 | int current_invocation[2]; | |
136 | ||
137 | /* The current charset designated to each graphic register. */ | |
138 | int current_designation[4]; | |
139 | ||
140 | /* A charset initially designated to each graphic register. */ | |
141 | int initial_designation[4]; | |
142 | ||
143 | /* A graphic register to which each charset should be designated. */ | |
144 | int requested_designation[MAX_CHARSET]; | |
145 | ||
146 | /* Set to 1 temporarily only when graphic register 2 or 3 is invoked | |
147 | by single-shift while encoding. */ | |
148 | int single_shifting; | |
149 | }; | |
150 | ||
151 | /* Macros to access each field in the structure `spec.iso2022'. */ | |
152 | #define CODING_SPEC_ISO_INVOCATION(coding, plane) \ | |
153 | coding->spec.iso2022.current_invocation[plane] | |
154 | #define CODING_SPEC_ISO_DESIGNATION(coding, reg) \ | |
155 | coding->spec.iso2022.current_designation[reg] | |
156 | #define CODING_SPEC_ISO_INITIAL_DESIGNATION(coding, reg) \ | |
157 | coding->spec.iso2022.initial_designation[reg] | |
158 | #define CODING_SPEC_ISO_REQUESTED_DESIGNATION(coding, charset) \ | |
159 | coding->spec.iso2022.requested_designation[charset] | |
160 | ||
161 | /* Set to 1 temporarily only when encoding a character with | |
162 | single-shift function. */ | |
163 | #define CODING_SPEC_ISO_SINGLE_SHIFTING(coding) \ | |
164 | coding->spec.iso2022.single_shifting | |
165 | ||
166 | /* Return a charset which is currently designated to the graphic plane | |
167 | PLANE in the coding-system CODING. */ | |
168 | #define CODING_SPEC_ISO_PLANE_CHARSET(coding, plane) \ | |
169 | CODING_SPEC_ISO_DESIGNATION \ | |
170 | (coding, CODING_SPEC_ISO_INVOCATION (coding, plane)) | |
171 | ||
172 | /*** BIG5 section ***/ | |
173 | ||
174 | /* Macros to denote each type of BIG5 coding system. */ | |
175 | #define CODING_FLAG_BIG5_HKU 0x00 /* BIG5-HKU is one of variants of | |
176 | BIG5 developed by Hong Kong | |
177 | University. */ | |
178 | #define CODING_FLAG_BIG5_ETEN 0x01 /* BIG5_ETen is one of variants | |
179 | of BIG5 developed by the | |
180 | company ETen in Taiwan. */ | |
181 | ||
182 | /*** GENERAL section ***/ | |
183 | ||
184 | /* Types of coding system. */ | |
185 | enum coding_type | |
186 | { | |
187 | coding_type_no_conversion, /* A coding system which requires no | |
188 | conversion for reading and writing | |
189 | including end-of-line format. */ | |
190 | coding_type_internal, /* A coding system used in Emacs' | |
191 | buffer and string. Requires no | |
192 | conversion for reading and writing | |
193 | except for end-of-line format. */ | |
194 | coding_type_automatic, /* A coding system which requires | |
195 | automatic detection of a real | |
196 | coding system. */ | |
197 | coding_type_sjis, /* SJIS coding system for Japanese. */ | |
198 | coding_type_iso2022, /* Any coding system of ISO2022 | |
199 | variants. */ | |
200 | coding_type_big5, /* BIG5 coding system for Chinese. */ | |
201 | coding_type_ccl /* The coding system of which decoder | |
202 | and encoder are written in CCL. */ | |
203 | }; | |
204 | ||
205 | /* Formats of end-of-line. */ | |
206 | #define CODING_EOL_LF 0 /* Line-feed only, same as Emacs' | |
207 | internal format. */ | |
208 | #define CODING_EOL_CRLF 1 /* Sequence of carriage-return and | |
209 | line-feed. */ | |
210 | #define CODING_EOL_CR 2 /* Carriage-return only. */ | |
211 | #define CODING_EOL_AUTOMATIC 3 /* This value is used to denote the | |
212 | eol-type is not yet decided. */ | |
213 | ||
214 | /* Character composition status while encoding/decoding. */ | |
215 | #define COMPOSING_NO 0 /* not composing */ | |
216 | #define COMPOSING_WITH_RULE_HEAD 1 /* 1st char of with-rule composing follow */ | |
217 | #define COMPOSING_NO_RULE_HEAD 2 /* 1st char of no-rule composing follow */ | |
218 | #define COMPOSING_WITH_RULE_TAIL 3 /* Nth char of with-rule composing follow */ | |
219 | #define COMPOSING_NO_RULE_TAIL 4 /* Nth char of no-rule composing follow */ | |
220 | #define COMPOSING_WITH_RULE_RULE 5 /* composition rule follow */ | |
221 | ||
222 | /* 1 iff composing. */ | |
223 | #define COMPOSING_P(composing) (composing) | |
224 | /* 1 iff 1st char of composing element follows. */ | |
225 | #define COMPOSING_HEAD_P(composing) \ | |
226 | ((composing) && (composing) <= COMPOSING_NO_RULE_HEAD) | |
227 | /* 1 iff composing with embeded composition rule. */ | |
228 | #define COMPOSING_WITH_RULE_P(composing) ((composing) & 1) | |
229 | ||
230 | struct coding_system | |
231 | { | |
232 | /* Type of the coding system. */ | |
233 | enum coding_type type; | |
234 | ||
235 | /* If the coding system requires specific code to be attached at the | |
236 | tail of converted text, this value should be set to `1'. */ | |
237 | int require_flushing; | |
238 | ||
239 | /* Flag bits of the coding system. The meaning of each bit depends | |
240 | on the type of the coding system. */ | |
241 | unsigned int flags; | |
242 | ||
243 | /* Type of end-of-line format (LF, CRLF, or CR) of the coding system. */ | |
244 | int eol_type; | |
245 | ||
246 | /* Non-zero means that the current source text is the last block of the | |
247 | whole text to be converted. */ | |
248 | int last_block; | |
249 | ||
250 | /* Non-zero means that characters are being composed currently while | |
251 | decoding or encoding. See macros COMPOSING_XXXX above for the | |
252 | meaing of each non-zero value. */ | |
253 | int composing; | |
254 | ||
255 | /* 0 (left-to-right) or 1 (right-to-left): the direction of the text | |
256 | being processed currently. */ | |
257 | int direction; | |
258 | ||
259 | /* Non-zero means that the current source text is in a buffer which | |
260 | enables selective display. */ | |
261 | int selective; | |
262 | ||
263 | /* Detailed information specific to each type of coding system. */ | |
264 | union spec | |
265 | { | |
266 | struct iso2022_spec iso2022; | |
267 | struct ccl_spec ccl; /* Defined in ccl.h. */ | |
268 | } spec; | |
269 | ||
270 | /* Backward pointer to the Lisp symbol of the coding system. */ | |
271 | Lisp_Object symbol; | |
272 | ||
273 | /* Lisp function (symbol) to be called after decoding to do | |
274 | additional conversion. */ | |
275 | Lisp_Object post_read_conversion; | |
276 | ||
277 | /* Lisp function (symbol) to be called before encoding to do | |
278 | additional conversion. */ | |
279 | Lisp_Object pre_write_conversion; | |
280 | ||
281 | /* Carryover yielded by decoding/encoding incomplete source. No | |
282 | coding-system yields more than 7-byte of carryover. This does | |
283 | not include a text which is not processed because of short of | |
284 | output buffer. */ | |
285 | char carryover[8]; | |
286 | ||
287 | /* Actual data length in the above array. */ | |
288 | int carryover_size; | |
289 | }; | |
290 | ||
291 | /* Return 1 if the coding-system CODING requires conversion of | |
292 | representation of a visible character (text). */ | |
293 | #define CODING_REQUIRE_TEXT_CONVERSION(coding) \ | |
294 | ((coding)->type != coding_type_no_conversion \ | |
295 | && (coding)->type != coding_type_internal) | |
296 | ||
297 | /* Return 1 if the coding-system CODING requires conversion of the | |
298 | format of end-of-line. */ | |
299 | #define CODING_REQUIRE_EOL_CONVERSION(coding) \ | |
300 | ((coding)->eol_type != CODING_EOL_AUTOMATIC \ | |
301 | && (coding)->eol_type != CODING_EOL_LF) | |
302 | ||
303 | /* Return 1 if the coding-system CODING requires some conversion. */ | |
304 | #define CODING_REQUIRE_CONVERSION(coding) \ | |
305 | (CODING_REQUIRE_TEXT_CONVERSION (coding) \ | |
306 | || CODING_REQUIRE_EOL_CONVERSION (coding)) | |
307 | ||
308 | /* Index for each coding category in `coding_category_table' */ | |
309 | #define CODING_CATEGORY_IDX_INTERNAL 0 | |
310 | #define CODING_CATEGORY_IDX_SJIS 1 | |
311 | #define CODING_CATEGORY_IDX_ISO_7 2 | |
312 | #define CODING_CATEGORY_IDX_ISO_8_1 3 | |
313 | #define CODING_CATEGORY_IDX_ISO_8_2 4 | |
314 | #define CODING_CATEGORY_IDX_ISO_ELSE 5 | |
315 | #define CODING_CATEGORY_IDX_BIG5 6 | |
316 | #define CODING_CATEGORY_IDX_BINARY 7 | |
317 | #define CODING_CATEGORY_IDX_MAX 8 | |
318 | ||
319 | /* Definitions of flag bits returned by the function | |
320 | detect_coding_mask (). */ | |
321 | #define CODING_CATEGORY_MASK_INTERNAL (1 << CODING_CATEGORY_IDX_INTERNAL) | |
322 | #define CODING_CATEGORY_MASK_SJIS (1 << CODING_CATEGORY_IDX_SJIS) | |
323 | #define CODING_CATEGORY_MASK_ISO_7 (1 << CODING_CATEGORY_IDX_ISO_7) | |
324 | #define CODING_CATEGORY_MASK_ISO_8_1 (1 << CODING_CATEGORY_IDX_ISO_8_1) | |
325 | #define CODING_CATEGORY_MASK_ISO_8_2 (1 << CODING_CATEGORY_IDX_ISO_8_2) | |
326 | #define CODING_CATEGORY_MASK_ISO_ELSE (1 << CODING_CATEGORY_IDX_ISO_ELSE) | |
327 | #define CODING_CATEGORY_MASK_BIG5 (1 << CODING_CATEGORY_IDX_BIG5) | |
328 | ||
329 | /* This value is returned if detect_coding_mask () find nothing other | |
330 | than ASCII characters. */ | |
331 | #define CODING_CATEGORY_MASK_ANY \ | |
332 | ( CODING_CATEGORY_MASK_INTERNAL \ | |
333 | | CODING_CATEGORY_MASK_SJIS \ | |
334 | | CODING_CATEGORY_MASK_ISO_7 \ | |
335 | | CODING_CATEGORY_MASK_ISO_8_1 \ | |
336 | | CODING_CATEGORY_MASK_ISO_8_2 \ | |
337 | | CODING_CATEGORY_MASK_ISO_ELSE \ | |
338 | | CODING_CATEGORY_MASK_BIG5) | |
339 | ||
340 | /* Macros to decode or encode a character of JISX0208 in SJIS. S1 and | |
341 | S2 are the 1st and 2nd position-codes of JISX0208 in SJIS coding | |
342 | system. C1 and C2 are the 1st and 2nd position codes of Emacs' | |
343 | internal format. */ | |
344 | ||
345 | #define DECODE_SJIS(s1, s2, c1, c2) \ | |
346 | do { \ | |
347 | if (s2 >= 0x9F) \ | |
348 | c1 = s1 * 2 - (s1 >= 0xE0 ? 0x160 : 0xE0), \ | |
349 | c2 = s2 - 0x7E; \ | |
350 | else \ | |
351 | c1 = s1 * 2 - ((s1 >= 0xE0) ? 0x161 : 0xE1), \ | |
352 | c2 = s2 - ((s2 >= 0x7F) ? 0x20 : 0x1F); \ | |
353 | } while (0) | |
354 | ||
355 | #define ENCODE_SJIS(c1, c2, s1, s2) \ | |
356 | do { \ | |
357 | if (c1 & 1) \ | |
358 | s1 = c1 / 2 + ((c1 < 0x5F) ? 0x71 : 0xB1), \ | |
359 | s2 = c2 + ((c2 >= 0x60) ? 0x20 : 0x1F); \ | |
360 | else \ | |
361 | s1 = c1 / 2 + ((c1 < 0x5F) ? 0x70 : 0xB0), \ | |
362 | s2 = c2 + 0x7E; \ | |
363 | } while (0) | |
364 | ||
365 | /* Extern declarations. */ | |
366 | extern int decode_coding (), encode_coding (); | |
367 | extern int decoding_buffer_size (), encoding_buffer_size (); | |
368 | extern int conversion_buffer_size; | |
369 | extern char *conversion_buffer, *get_conversion_buffer (); | |
370 | extern Lisp_Object Fcheck_coding_system (); | |
371 | extern Lisp_Object Qcoding_system, Qeol_type, Qcoding_category_index; | |
372 | extern Lisp_Object Qbuffer_file_coding_system; | |
373 | extern Lisp_Object Vcoding_category_list; | |
374 | ||
375 | /* Mnemonic character to indicate each type of end-of-line. */ | |
376 | extern int eol_mnemonic_unix, eol_mnemonic_dos, eol_mnemonic_mac; | |
377 | /* Mnemonic character to indicate type of end-of-line is not yet decided. */ | |
378 | extern int eol_mnemonic_undecided; | |
379 | ||
380 | /* Table of coding-systems currently assigned to each coding-category. */ | |
381 | extern Lisp_Object coding_category_table[CODING_CATEGORY_IDX_MAX]; | |
382 | /* Table of names of symbol for each coding-category. */ | |
383 | extern char *coding_category_name[CODING_CATEGORY_IDX_MAX]; | |
384 | ||
385 | #ifdef emacs | |
386 | extern Lisp_Object Qfile_coding_system; | |
387 | extern Lisp_Object Qcall_process, Qcall_process_region, Qprocess_argument; | |
388 | extern Lisp_Object Qstart_process, Qopen_network_stream; | |
389 | ||
390 | /* Coding-system for reading files and receiving data from process. */ | |
391 | extern Lisp_Object Vcoding_system_for_read; | |
392 | /* Coding-system for writing files and sending data to process. */ | |
393 | extern Lisp_Object Vcoding_system_for_write; | |
394 | /* Coding-system actually used in the latest I/O. */ | |
395 | extern Lisp_Object Vlast_coding_system_used; | |
396 | ||
397 | /* Coding-system to be used for encoding terminal output. This | |
398 | structure contains information of a coding-system specified by the | |
399 | function `set-terminal-coding-system'. */ | |
400 | extern struct coding_system terminal_coding; | |
401 | ||
402 | /* Coding-system of what is sent from terminal keyboard. This | |
403 | structure contains information of a coding-system specified by the | |
404 | function `set-keyboard-coding-system'. */ | |
405 | extern struct coding_system keyboard_coding; | |
406 | ||
407 | extern Lisp_Object Vcoding_system_alist; | |
408 | ||
409 | #endif | |
410 | ||
411 | #endif /* _CODING_H */ |