1 /* Code conversion functions.
2 Copyright (C) 1991, 1995 Free Software Foundation, Inc.
3 Copyright (C) 1995 Sun Microsystems, Inc.
5 This file is part of SXEmacs
7 SXEmacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 SXEmacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 /* Synched up with: Mule 2.3. Not in FSF. */
23 /* Rewritten by Ben Wing <ben@xemacs.org>. */
30 #include "ui/insdel.h"
37 #include "file-coding.h"
39 Lisp_Object Qcoding_system_error;
41 Lisp_Object Vkeyboard_coding_system;
42 Lisp_Object Vterminal_coding_system;
43 Lisp_Object Vcoding_system_for_read;
44 Lisp_Object Vcoding_system_for_write;
45 Lisp_Object Vfile_name_coding_system;
47 /* Table of symbols identifying each coding category. */
48 Lisp_Object coding_category_symbol[CODING_CATEGORY_LAST];
50 struct file_coding_dump {
51 /* Coding system currently associated with each coding category. */
52 Lisp_Object coding_category_system[CODING_CATEGORY_LAST];
54 /* Table of all coding categories in decreasing order of priority.
55 This describes a permutation of the possible coding categories. */
56 int coding_category_by_priority[CODING_CATEGORY_LAST];
59 Lisp_Object ucs_to_mule_table[65536];
63 static const struct lrecord_description fcd_description_1[] = {
64 {XD_LISP_OBJECT_ARRAY,
65 offsetof(struct file_coding_dump, coding_category_system),
66 CODING_CATEGORY_LAST},
68 {XD_LISP_OBJECT_ARRAY,
69 offsetof(struct file_coding_dump, ucs_to_mule_table),
70 countof(fcd->ucs_to_mule_table)},
75 static const struct struct_description fcd_description = {
76 sizeof(struct file_coding_dump),
80 Lisp_Object mule_to_ucs_table;
82 Lisp_Object Qcoding_systemp;
84 Lisp_Object Qraw_text, Qno_conversion, Qccl, Qiso2022;
85 /* Qinternal in general.c */
87 Lisp_Object Qmnemonic, Qeol_type;
88 Lisp_Object Qcr, Qcrlf, Qlf;
89 Lisp_Object Qeol_cr, Qeol_crlf, Qeol_lf;
90 Lisp_Object Qpost_read_conversion;
91 Lisp_Object Qpre_write_conversion;
94 Lisp_Object Qucs4, Qutf8;
95 Lisp_Object Qbig5, Qshift_jis;
96 Lisp_Object Qcharset_g0, Qcharset_g1, Qcharset_g2, Qcharset_g3;
97 Lisp_Object Qforce_g0_on_output, Qforce_g1_on_output;
98 Lisp_Object Qforce_g2_on_output, Qforce_g3_on_output;
99 Lisp_Object Qno_iso6429;
100 Lisp_Object Qinput_charset_conversion, Qoutput_charset_conversion;
101 Lisp_Object Qescape_quoted;
102 Lisp_Object Qno_ascii_eol, Qno_ascii_cntl, Qseven, Qlock_shift;
104 Lisp_Object Qencode, Qdecode;
106 Lisp_Object Vcoding_system_hash_table;
108 int enable_multibyte_characters;
111 /* Additional information used by the ISO2022 decoder and detector. */
112 struct iso2022_decoder {
113 /* CHARSET holds the character sets currently assigned to the G0
114 through G3 variables. It is initialized from the array
115 INITIAL_CHARSET in CODESYS. */
116 Lisp_Object charset[4];
118 /* Which registers are currently invoked into the left (GL) and
119 right (GR) halves of the 8-bit encoding space? */
120 int register_left, register_right;
122 /* ISO_ESC holds a value indicating part of an escape sequence
123 that has already been seen. */
124 enum iso_esc_flag esc;
126 /* This records the bytes we've seen so far in an escape sequence,
127 in case the sequence is invalid (we spit out the bytes unchanged). */
128 unsigned char esc_bytes[8];
130 /* Index for next byte to store in ISO escape sequence. */
133 #ifdef ENABLE_COMPOSITE_CHARS
134 /* Stuff seen so far when composing a string. */
135 unsigned_char_dynarr *composite_chars;
138 /* If we saw an invalid designation sequence for a particular
139 register, we flag it here and switch to ASCII. The next time we
140 see a valid designation for this register, we turn off the flag
141 and do the designation normally, but pretend the sequence was
142 invalid. The effect of all this is that (most of the time) the
143 escape sequences for both the switch to the unknown charset, and
144 the switch back to the known charset, get inserted literally into
145 the buffer and saved out as such. The hope is that we can
146 preserve the escape sequences so that the resulting written out
147 file makes sense. If we don't do any of this, the designation
148 to the invalid charset will be preserved but that switch back
149 to the known charset will probably get eaten because it was
150 the same charset that was already present in the register. */
151 unsigned char invalid_designated[4];
153 /* We try to do similar things as above for direction-switching
154 sequences. If we encountered a direction switch while an
155 invalid designation was present, or an invalid designation
156 just after a direction switch (i.e. no valid designation
157 encountered yet), we insert the direction-switch escape
158 sequence literally into the output stream, and later on
159 insert the corresponding direction-restoring escape sequence
161 unsigned int switched_dir_and_no_valid_charset_yet:1;
162 unsigned int invalid_switch_dir:1;
164 /* Tells the decoder to output the escape sequence literally
165 even though it was valid. Used in the games we play to
166 avoid lossage when we encounter invalid designations. */
167 unsigned int output_literally:1;
168 /* We encountered a direction switch followed by an invalid
169 designation. We didn't output the direction switch
170 literally because we didn't know about the invalid designation;
171 but we have to do so now. */
172 unsigned int output_direction_sequence:1;
175 EXFUN(Fcopy_coding_system, 2);
177 struct detection_state;
178 static int detect_coding_sjis(struct detection_state *st,
179 const Extbyte * src, Lstream_data_count n);
180 static void decode_coding_sjis(lstream_t decoding, const Extbyte * src,
181 unsigned_char_dynarr * dst,
182 Lstream_data_count n);
183 static void encode_coding_sjis(lstream_t encoding, const Bufbyte * src,
184 unsigned_char_dynarr * dst,
185 Lstream_data_count n);
186 static int detect_coding_big5(struct detection_state *st, const Extbyte * src,
187 Lstream_data_count n);
188 static void decode_coding_big5(lstream_t decoding, const Extbyte * src,
189 unsigned_char_dynarr * dst,
190 Lstream_data_count n);
191 static void encode_coding_big5(lstream_t encoding, const Bufbyte * src,
192 unsigned_char_dynarr * dst,
193 Lstream_data_count n);
194 static int detect_coding_ucs4(struct detection_state *st, const Extbyte * src,
195 Lstream_data_count n);
196 static void decode_coding_ucs4(lstream_t decoding, const Extbyte * src,
197 unsigned_char_dynarr * dst,
198 Lstream_data_count n);
199 static void encode_coding_ucs4(lstream_t encoding, const Bufbyte * src,
200 unsigned_char_dynarr * dst,
201 Lstream_data_count n);
202 static int detect_coding_utf8(struct detection_state *st, const Extbyte * src,
203 Lstream_data_count n);
204 static void decode_coding_utf8(lstream_t decoding, const Extbyte * src,
205 unsigned_char_dynarr * dst,
206 Lstream_data_count n);
207 static void encode_coding_utf8(lstream_t encoding, const Bufbyte * src,
208 unsigned_char_dynarr * dst,
209 Lstream_data_count n);
210 static int postprocess_iso2022_mask(int mask);
211 static void reset_iso2022(Lisp_Object coding_system,
212 struct iso2022_decoder *iso);
213 static int detect_coding_iso2022(struct detection_state *st,
214 const Extbyte * src, Lstream_data_count n);
215 static void decode_coding_iso2022(lstream_t decoding, const Extbyte * src,
216 unsigned_char_dynarr * dst,
217 Lstream_data_count n);
218 static void encode_coding_iso2022(lstream_t encoding, const Bufbyte * src,
219 unsigned_char_dynarr * dst,
220 Lstream_data_count n);
222 static void decode_coding_no_conversion(lstream_t decoding, const Extbyte * src,
223 unsigned_char_dynarr * dst,
224 Lstream_data_count n);
225 static void encode_coding_no_conversion(lstream_t encoding, const Bufbyte * src,
226 unsigned_char_dynarr * dst,
227 Lstream_data_count n);
228 static void mule_decode(lstream_t decoding, const Extbyte * src,
229 unsigned_char_dynarr * dst, Lstream_data_count n);
230 static void mule_encode(lstream_t encoding, const Bufbyte * src,
231 unsigned_char_dynarr * dst, Lstream_data_count n);
233 typedef struct codesys_prop codesys_prop;
234 struct codesys_prop {
240 Dynarr_declare(codesys_prop);
241 } codesys_prop_dynarr;
243 static const struct lrecord_description codesys_prop_description_1[] = {
244 {XD_LISP_OBJECT, offsetof(codesys_prop, sym)},
248 static const struct struct_description codesys_prop_description = {
249 sizeof(codesys_prop),
250 codesys_prop_description_1
253 static const struct lrecord_description codesys_prop_dynarr_description_1[] = {
254 XD_DYNARR_DESC(codesys_prop_dynarr, &codesys_prop_description),
258 static const struct struct_description codesys_prop_dynarr_description = {
259 sizeof(codesys_prop_dynarr),
260 codesys_prop_dynarr_description_1
263 codesys_prop_dynarr *the_codesys_prop_dynarr;
265 enum codesys_prop_enum {
267 CODESYS_PROP_ISO2022,
271 /************************************************************************/
272 /* Coding system functions */
273 /************************************************************************/
275 static Lisp_Object mark_coding_system(Lisp_Object);
276 static void print_coding_system(Lisp_Object, Lisp_Object, int);
277 static void finalize_coding_system(void *header, int for_disksave);
280 static const struct lrecord_description ccs_description_1[] = {
281 {XD_LISP_OBJECT, offsetof(charset_conversion_spec, from_charset)},
282 {XD_LISP_OBJECT, offsetof(charset_conversion_spec, to_charset)},
286 static const struct struct_description ccs_description = {
287 sizeof(charset_conversion_spec),
291 static const struct lrecord_description ccsd_description_1[] = {
292 XD_DYNARR_DESC(charset_conversion_spec_dynarr, &ccs_description),
296 static const struct struct_description ccsd_description = {
297 sizeof(charset_conversion_spec_dynarr),
302 static const struct lrecord_description coding_system_description[] = {
303 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, name)},
304 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, doc_string)},
305 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, mnemonic)},
306 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, post_read_conversion)},
307 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, pre_write_conversion)},
308 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, eol_lf)},
309 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, eol_crlf)},
310 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, eol_cr)},
312 {XD_LISP_OBJECT_ARRAY,
313 offsetof(Lisp_Coding_System, iso2022.initial_charset), 4},
314 {XD_STRUCT_PTR, offsetof(Lisp_Coding_System, iso2022.input_conv), 1,
316 {XD_STRUCT_PTR, offsetof(Lisp_Coding_System, iso2022.output_conv), 1,
318 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, ccl.decode)},
319 {XD_LISP_OBJECT, offsetof(Lisp_Coding_System, ccl.encode)},
324 DEFINE_LRECORD_IMPLEMENTATION("coding-system", coding_system,
325 mark_coding_system, print_coding_system,
326 finalize_coding_system,
327 0, 0, coding_system_description,
330 static Lisp_Object mark_coding_system(Lisp_Object obj)
332 Lisp_Coding_System *codesys = XCODING_SYSTEM(obj);
334 mark_object(CODING_SYSTEM_NAME(codesys));
335 mark_object(CODING_SYSTEM_DOC_STRING(codesys));
336 mark_object(CODING_SYSTEM_MNEMONIC(codesys));
337 mark_object(CODING_SYSTEM_EOL_LF(codesys));
338 mark_object(CODING_SYSTEM_EOL_CRLF(codesys));
339 mark_object(CODING_SYSTEM_EOL_CR(codesys));
341 switch (CODING_SYSTEM_TYPE(codesys)) {
344 case CODESYS_ISO2022:
345 for (i = 0; i < 4; i++)
346 mark_object(CODING_SYSTEM_ISO2022_INITIAL_CHARSET
348 if (codesys->iso2022.input_conv) {
350 i < Dynarr_length(codesys->iso2022.input_conv);
352 struct charset_conversion_spec *ccs =
353 Dynarr_atp(codesys->iso2022.input_conv, i);
354 mark_object(ccs->from_charset);
355 mark_object(ccs->to_charset);
358 if (codesys->iso2022.output_conv) {
360 i < Dynarr_length(codesys->iso2022.output_conv);
362 struct charset_conversion_spec *ccs =
363 Dynarr_atp(codesys->iso2022.output_conv, i);
364 mark_object(ccs->from_charset);
365 mark_object(ccs->to_charset);
371 mark_object(CODING_SYSTEM_CCL_DECODE(codesys));
372 mark_object(CODING_SYSTEM_CCL_ENCODE(codesys));
375 /* list the rest of them lot explicitly */
376 case CODESYS_AUTODETECT:
377 case CODESYS_SHIFT_JIS:
381 case CODESYS_NO_CONVERSION:
383 case CODESYS_INTERNAL:
390 mark_object(CODING_SYSTEM_PRE_WRITE_CONVERSION(codesys));
391 return CODING_SYSTEM_POST_READ_CONVERSION(codesys);
395 print_coding_system(Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
397 Lisp_Coding_System *c = XCODING_SYSTEM(obj);
399 error("printing unreadable object #<coding-system 0x%x>",
402 write_c_string("#<coding-system ", printcharfun);
403 print_internal(c->name, printcharfun, 1);
404 write_c_string(">", printcharfun);
407 static void finalize_coding_system(void *header, int for_disksave)
409 Lisp_Coding_System *c = (Lisp_Coding_System *) header;
410 /* Since coding systems never go away, this function is not
411 necessary. But it would be necessary if we changed things
412 so that coding systems could go away. */
413 if (!for_disksave) { /* see comment in lstream.c */
414 switch (CODING_SYSTEM_TYPE(c)) {
416 case CODESYS_ISO2022:
417 if (c->iso2022.input_conv) {
418 Dynarr_free(c->iso2022.input_conv);
419 c->iso2022.input_conv = 0;
421 if (c->iso2022.output_conv) {
422 Dynarr_free(c->iso2022.output_conv);
423 c->iso2022.output_conv = 0;
427 /* list the rest of them lot explicitly */
428 case CODESYS_AUTODETECT:
429 case CODESYS_SHIFT_JIS:
434 case CODESYS_NO_CONVERSION:
436 case CODESYS_INTERNAL:
445 static eol_type_t symbol_to_eol_type(Lisp_Object symbol)
447 CHECK_SYMBOL(symbol);
449 return EOL_AUTODETECT;
452 if (EQ(symbol, Qcrlf))
457 signal_simple_error("Unrecognized eol type", symbol);
458 return EOL_AUTODETECT; /* not reached */
461 static Lisp_Object eol_type_to_symbol(eol_type_t type)
478 static void setup_eol_coding_systems(Lisp_Coding_System * codesys)
480 Lisp_Object codesys_obj;
481 int len = string_length(XSYMBOL(CODING_SYSTEM_NAME(codesys))->name);
482 char *codesys_name = (char *)alloca(len + 7);
484 char *codesys_mnemonic = 0;
486 Lisp_Object codesys_name_sym, sub_codesys_obj;
490 XSETCODING_SYSTEM(codesys_obj, codesys);
493 string_data(XSYMBOL(CODING_SYSTEM_NAME(codesys))->name), len);
495 if (STRINGP(CODING_SYSTEM_MNEMONIC(codesys))) {
496 mlen = XSTRING_LENGTH(CODING_SYSTEM_MNEMONIC(codesys));
497 codesys_mnemonic = (char *)alloca(mlen + 7);
498 memcpy(codesys_mnemonic,
499 XSTRING_DATA(CODING_SYSTEM_MNEMONIC(codesys)), mlen);
501 #define DEFINE_SUB_CODESYS(op_sys, op_sys_abbr, Type) do { \
502 strcpy (codesys_name + len, "-" op_sys); \
504 strcpy (codesys_mnemonic + mlen, op_sys_abbr); \
505 codesys_name_sym = intern (codesys_name); \
506 sub_codesys_obj = Fcopy_coding_system (codesys_obj, codesys_name_sym); \
507 XCODING_SYSTEM_EOL_TYPE (sub_codesys_obj) = Type; \
509 XCODING_SYSTEM_MNEMONIC(sub_codesys_obj) = \
510 build_string (codesys_mnemonic); \
511 CODING_SYSTEM_##Type (codesys) = sub_codesys_obj; \
514 DEFINE_SUB_CODESYS("unix", "", EOL_LF);
515 DEFINE_SUB_CODESYS("dos", ":T", EOL_CRLF);
516 DEFINE_SUB_CODESYS("mac", ":t", EOL_CR);
519 DEFUN("coding-system-p", Fcoding_system_p, 1, 1, 0, /*
520 Return t if OBJECT is a coding system.
521 A coding system is an object that defines how text containing multiple
522 character sets is encoded into a stream of (typically 8-bit) bytes.
523 The coding system is used to decode the stream into a series of
524 characters (which may be from multiple charsets) when the text is read
525 from a file or process, and is used to encode the text back into the
526 same format when it is written out to a file or process.
528 For example, many ISO2022-compliant coding systems (such as Compound
529 Text, which is used for inter-client data under the X Window System)
530 use escape sequences to switch between different charsets -- Japanese
531 Kanji, for example, is invoked with "ESC $ ( B"; ASCII is invoked
532 with "ESC ( B"; and Cyrillic is invoked with "ESC - L". See
533 `make-coding-system' for more information.
535 Coding systems are normally identified using a symbol, and the
536 symbol is accepted in place of the actual coding system object whenever
537 a coding system is called for. (This is similar to how faces work.)
541 return CODING_SYSTEMP(object) ? Qt : Qnil;
544 DEFUN("find-coding-system", Ffind_coding_system, 1, 1, 0, /*
545 Retrieve the coding system of the given name.
547 If CODING-SYSTEM-OR-NAME is a coding-system object, it is simply
548 returned. Otherwise, CODING-SYSTEM-OR-NAME should be a symbol.
549 If there is no such coding system, nil is returned. Otherwise the
550 associated coding system object is returned.
552 (coding_system_or_name))
554 if (NILP(coding_system_or_name))
555 coding_system_or_name = Qbinary;
556 else if (CODING_SYSTEMP(coding_system_or_name))
557 return coding_system_or_name;
559 CHECK_SYMBOL(coding_system_or_name);
562 coding_system_or_name =
563 Fgethash(coding_system_or_name, Vcoding_system_hash_table,
566 if (CODING_SYSTEMP(coding_system_or_name)
567 || NILP(coding_system_or_name))
568 return coding_system_or_name;
572 DEFUN("get-coding-system", Fget_coding_system, 1, 1, 0, /*
573 Retrieve the coding system of the given name.
574 Same as `find-coding-system' except that if there is no such
575 coding system, an error is signaled instead of returning nil.
579 Lisp_Object coding_system = Ffind_coding_system(name);
581 if (NILP(coding_system))
582 signal_simple_error("No such coding system", name);
583 return coding_system;
586 /* We store the coding systems in hash tables with the names as the key and the
587 actual coding system object as the value. Occasionally we need to use them
588 in a list format. These routines provide us with that. */
589 struct coding_system_list_closure {
590 Lisp_Object *coding_system_list;
594 add_coding_system_to_list_mapper(Lisp_Object key, Lisp_Object value,
595 void *coding_system_list_closure)
597 /* This function can GC */
598 struct coding_system_list_closure *cscl =
599 (struct coding_system_list_closure *)coding_system_list_closure;
600 Lisp_Object *coding_system_list = cscl->coding_system_list;
602 *coding_system_list = Fcons(key, *coding_system_list);
606 DEFUN("coding-system-list", Fcoding_system_list, 0, 0, 0, /*
607 Return a list of the names of all defined coding systems.
611 Lisp_Object coding_system_list = Qnil;
613 struct coding_system_list_closure coding_system_list_closure;
615 GCPRO1(coding_system_list);
616 coding_system_list_closure.coding_system_list = &coding_system_list;
617 elisp_maphash(add_coding_system_to_list_mapper,
618 Vcoding_system_hash_table, &coding_system_list_closure);
621 return coding_system_list;
624 DEFUN("coding-system-name", Fcoding_system_name, 1, 1, 0, /*
625 Return the name of the given coding system.
629 coding_system = Fget_coding_system(coding_system);
630 return XCODING_SYSTEM_NAME(coding_system);
633 static Lisp_Coding_System *allocate_coding_system(enum coding_system_type type,
636 Lisp_Coding_System *codesys =
637 alloc_lcrecord_type(Lisp_Coding_System, &lrecord_coding_system);
639 zero_lcrecord(codesys);
640 CODING_SYSTEM_PRE_WRITE_CONVERSION(codesys) = Qnil;
641 CODING_SYSTEM_POST_READ_CONVERSION(codesys) = Qnil;
642 CODING_SYSTEM_EOL_TYPE(codesys) = EOL_AUTODETECT;
643 CODING_SYSTEM_EOL_CRLF(codesys) = Qnil;
644 CODING_SYSTEM_EOL_CR(codesys) = Qnil;
645 CODING_SYSTEM_EOL_LF(codesys) = Qnil;
646 CODING_SYSTEM_TYPE(codesys) = type;
647 CODING_SYSTEM_MNEMONIC(codesys) = Qnil;
649 if (type == CODESYS_ISO2022) {
651 for (i = 0; i < 4; i++)
652 CODING_SYSTEM_ISO2022_INITIAL_CHARSET(codesys, i) =
654 } else if (type == CODESYS_CCL) {
655 CODING_SYSTEM_CCL_DECODE(codesys) = Qnil;
656 CODING_SYSTEM_CCL_ENCODE(codesys) = Qnil;
659 CODING_SYSTEM_NAME(codesys) = name;
665 /* Given a list of charset conversion specs as specified in a Lisp
666 program, parse it into STORE_HERE. */
669 parse_charset_conversion_specs(charset_conversion_spec_dynarr * store_here,
670 Lisp_Object spec_list)
674 EXTERNAL_LIST_LOOP(rest, spec_list) {
675 Lisp_Object car = XCAR(rest);
676 Lisp_Object from, to;
677 struct charset_conversion_spec spec;
679 if (!CONSP(car) || !CONSP(XCDR(car)) || !NILP(XCDR(XCDR(car))))
680 signal_simple_error("Invalid charset conversion spec",
682 from = Fget_charset(XCAR(car));
683 to = Fget_charset(XCAR(XCDR(car)));
684 if (XCHARSET_TYPE(from) != XCHARSET_TYPE(to))
685 signal_simple_error_2
686 ("Attempted conversion between different charset types",
688 spec.from_charset = from;
689 spec.to_charset = to;
691 Dynarr_add(store_here, spec);
695 /* Given a dynarr LOAD_HERE of internally-stored charset conversion
696 specs, return the equivalent as the Lisp programmer would see it.
698 If LOAD_HERE is 0, return Qnil. */
701 unparse_charset_conversion_specs(charset_conversion_spec_dynarr * load_here)
708 for (i = 0, result = Qnil; i < Dynarr_length(load_here); i++) {
709 struct charset_conversion_spec *ccs = Dynarr_atp(load_here, i);
711 Fcons(list2(ccs->from_charset, ccs->to_charset), result);
714 return Fnreverse(result);
719 DEFUN("make-coding-system", Fmake_coding_system, 2, 4, 0, /*
720 Register symbol NAME as a coding system.
722 TYPE describes the conversion method used and should be one of
725 Automatic conversion. SXEmacs attempts to detect the coding system
728 No conversion. Use this for binary files and such. On output,
729 graphic characters that are not in ASCII or Latin-1 will be
730 replaced by a ?. (For a no-conversion-encoded buffer, these
731 characters will only be present if you explicitly insert them.)
733 Shift-JIS (a Japanese encoding commonly used in PC operating systems).
735 ISO 10646 UCS-4 encoding.
737 ISO 10646 UTF-8 encoding.
739 Any ISO2022-compliant encoding. Among other things, this includes
740 JIS (the Japanese encoding commonly used for e-mail), EUC (the
741 standard Unix encoding for Japanese and other languages), and
742 Compound Text (the encoding used in X11). You can specify more
743 specific information about the conversion with the PROPS argument.
745 Big5 (the encoding commonly used for Taiwanese).
747 The conversion is performed using a user-written pseudo-code
748 program. CCL (Code Conversion Language) is the name of this
751 Write out or read in the raw contents of the memory representing
752 the buffer's text. This is primarily useful for debugging
753 purposes, and is only enabled when SXEmacs has been compiled with
754 DEBUG_SXEMACS defined (via the --debug configure option).
755 WARNING: Reading in a file using 'internal conversion can result
756 in an internal inconsistency in the memory representing a
757 buffer's text, which will produce unpredictable results and may
758 cause SXEmacs to crash. Under normal circumstances you should
759 never use 'internal conversion.
761 DOC-STRING is a string describing the coding system.
763 PROPS is a property list, describing the specific nature of the
764 character set. Recognized properties are:
767 String to be displayed in the modeline when this coding system is
771 End-of-line conversion to be used. It should be one of
774 Automatically detect the end-of-line type (LF, CRLF,
775 or CR). Also generate subsidiary coding systems named
776 `NAME-unix', `NAME-dos', and `NAME-mac', that are
777 identical to this coding system but have an EOL-TYPE
778 value of 'lf, 'crlf, and 'cr, respectively.
780 The end of a line is marked externally using ASCII LF.
781 Since this is also the way that SXEmacs represents an
782 end-of-line internally, specifying this option results
783 in no end-of-line conversion. This is the standard
784 format for Unix text files.
786 The end of a line is marked externally using ASCII
787 CRLF. This is the standard format for MS-DOS text
790 The end of a line is marked externally using ASCII CR.
791 This is the standard format for Macintosh text files.
793 Automatically detect the end-of-line type but do not
794 generate subsidiary coding systems. (This value is
795 converted to nil when stored internally, and
796 `coding-system-property' will return nil.)
798 'post-read-conversion
799 Function called after a file has been read in, to perform the
800 decoding. Called with two arguments, START and END, denoting
801 a region of the current buffer to be decoded.
803 'pre-write-conversion
804 Function called before a file is written out, to perform the
805 encoding. Called with two arguments, START and END, denoting
806 a region of the current buffer to be encoded.
808 The following additional properties are recognized if TYPE is 'iso2022:
814 The character set initially designated to the G0 - G3 registers.
815 The value should be one of
817 -- A charset object (designate that character set)
818 -- nil (do not ever use this register)
819 -- t (no character set is initially designated to
820 the register, but may be later on; this automatically
821 sets the corresponding `force-g*-on-output' property)
827 If non-nil, send an explicit designation sequence on output before
828 using the specified register.
831 If non-nil, use the short forms "ESC $ @", "ESC $ A", and
832 "ESC $ B" on output in place of the full designation sequences
833 "ESC $ ( @", "ESC $ ( A", and "ESC $ ( B".
836 If non-nil, don't designate ASCII to G0 at each end of line on output.
837 Setting this to non-nil also suppresses other state-resetting that
838 normally happens at the end of a line.
841 If non-nil, don't designate ASCII to G0 before control chars on output.
844 If non-nil, use 7-bit environment on output. Otherwise, use 8-bit
848 If non-nil, use locking-shift (SO/SI) instead of single-shift
849 or designation by escape sequence.
852 If non-nil, don't use ISO6429's direction specification.
855 If non-nil, literal control characters that are the same as
856 the beginning of a recognized ISO2022 or ISO6429 escape sequence
857 (in particular, ESC (0x1B), SO (0x0E), SI (0x0F), SS2 (0x8E),
858 SS3 (0x8F), and CSI (0x9B)) are "quoted" with an escape character
859 so that they can be properly distinguished from an escape sequence.
860 (Note that doing this results in a non-portable encoding.) This
861 encoding flag is used for byte-compiled files. Note that ESC
862 is a good choice for a quoting character because there are no
863 escape sequences whose second byte is a character from the Control-0
864 or Control-1 character sets; this is explicitly disallowed by the
867 'input-charset-conversion
868 A list of conversion specifications, specifying conversion of
869 characters in one charset to another when decoding is performed.
870 Each specification is a list of two elements: the source charset,
871 and the destination charset.
873 'output-charset-conversion
874 A list of conversion specifications, specifying conversion of
875 characters in one charset to another when encoding is performed.
876 The form of each specification is the same as for
877 'input-charset-conversion.
879 The following additional properties are recognized (and required)
883 CCL program used for decoding (converting to internal format).
886 CCL program used for encoding (converting to external format).
888 (name, type, doc_string, props))
890 Lisp_Coding_System *codesys;
891 enum coding_system_type ty;
892 int need_to_setup_eol_systems = 1;
894 /* Convert type to constant */
895 if (NILP(type) || EQ(type, Qundecided)) {
896 ty = CODESYS_AUTODETECT;
899 else if (EQ(type, Qshift_jis)) {
900 ty = CODESYS_SHIFT_JIS;
901 } else if (EQ(type, Qiso2022)) {
902 ty = CODESYS_ISO2022;
903 } else if (EQ(type, Qbig5)) {
905 } else if (EQ(type, Qucs4)) {
907 } else if (EQ(type, Qutf8)) {
909 } else if (EQ(type, Qccl)) {
913 else if (EQ(type, Qno_conversion)) {
914 ty = CODESYS_NO_CONVERSION;
917 else if (EQ(type, Qinternal)) {
918 ty = CODESYS_INTERNAL;
922 signal_simple_error("Invalid coding system type", type);
926 codesys = allocate_coding_system(ty, name);
928 if (NILP(doc_string))
929 doc_string = build_string("");
931 CHECK_STRING(doc_string);
932 CODING_SYSTEM_DOC_STRING(codesys) = doc_string;
935 EXTERNAL_PROPERTY_LIST_LOOP_3(key, value, props) {
936 if (EQ(key, Qmnemonic)) {
939 CODING_SYSTEM_MNEMONIC(codesys) = value;
942 else if (EQ(key, Qeol_type)) {
943 need_to_setup_eol_systems = NILP(value);
946 CODING_SYSTEM_EOL_TYPE(codesys) =
947 symbol_to_eol_type(value);
950 else if (EQ(key, Qpost_read_conversion))
951 CODING_SYSTEM_POST_READ_CONVERSION(codesys) =
953 else if (EQ(key, Qpre_write_conversion))
954 CODING_SYSTEM_PRE_WRITE_CONVERSION(codesys) =
957 else if (ty == CODESYS_ISO2022) {
958 #define FROB_INITIAL_CHARSET(charset_num) \
959 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, charset_num) = \
960 ((EQ (value, Qt) || EQ (value, Qnil)) ? value : Fget_charset (value))
962 if (EQ(key, Qcharset_g0))
963 FROB_INITIAL_CHARSET(0);
964 else if (EQ(key, Qcharset_g1))
965 FROB_INITIAL_CHARSET(1);
966 else if (EQ(key, Qcharset_g2))
967 FROB_INITIAL_CHARSET(2);
968 else if (EQ(key, Qcharset_g3))
969 FROB_INITIAL_CHARSET(3);
971 #define FROB_FORCE_CHARSET(charset_num) \
972 CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (codesys, charset_num) = !NILP (value)
974 else if (EQ(key, Qforce_g0_on_output))
975 FROB_FORCE_CHARSET(0);
976 else if (EQ(key, Qforce_g1_on_output))
977 FROB_FORCE_CHARSET(1);
978 else if (EQ(key, Qforce_g2_on_output))
979 FROB_FORCE_CHARSET(2);
980 else if (EQ(key, Qforce_g3_on_output))
981 FROB_FORCE_CHARSET(3);
983 #define FROB_BOOLEAN_PROPERTY(prop) \
984 CODING_SYSTEM_ISO2022_##prop (codesys) = !NILP (value)
986 else if (EQ(key, Qshort))
987 FROB_BOOLEAN_PROPERTY(SHORT);
988 else if (EQ(key, Qno_ascii_eol))
989 FROB_BOOLEAN_PROPERTY(NO_ASCII_EOL);
990 else if (EQ(key, Qno_ascii_cntl))
991 FROB_BOOLEAN_PROPERTY(NO_ASCII_CNTL);
992 else if (EQ(key, Qseven))
993 FROB_BOOLEAN_PROPERTY(SEVEN);
994 else if (EQ(key, Qlock_shift))
995 FROB_BOOLEAN_PROPERTY(LOCK_SHIFT);
996 else if (EQ(key, Qno_iso6429))
997 FROB_BOOLEAN_PROPERTY(NO_ISO6429);
998 else if (EQ(key, Qescape_quoted))
999 FROB_BOOLEAN_PROPERTY(ESCAPE_QUOTED);
1001 else if (EQ(key, Qinput_charset_conversion)) {
1002 codesys->iso2022.input_conv =
1003 Dynarr_new(charset_conversion_spec);
1004 parse_charset_conversion_specs(codesys->
1008 } else if (EQ(key, Qoutput_charset_conversion)) {
1009 codesys->iso2022.output_conv =
1010 Dynarr_new(charset_conversion_spec);
1011 parse_charset_conversion_specs(codesys->
1017 ("Unrecognized property", key);
1018 } else if (EQ(type, Qccl)) {
1020 struct ccl_program test_ccl;
1023 /* Check key first. */
1024 if (EQ(key, Qdecode))
1025 suffix = "-ccl-decode";
1026 else if (EQ(key, Qencode))
1027 suffix = "-ccl-encode";
1030 ("Unrecognized property", key);
1032 /* If value is vector, register it as a ccl program
1033 associated with an newly created symbol for
1034 backward compatibility. */
1035 if (VECTORP(value)) {
1038 (Fsymbol_name(name),
1039 build_string(suffix)),
1041 Fregister_ccl_program(sym, value);
1043 CHECK_SYMBOL(value);
1046 /* check if the given ccl programs are valid. */
1047 if (setup_ccl_program(&test_ccl, sym) < 0)
1049 ("Invalid CCL program", value);
1051 if (EQ(key, Qdecode))
1052 CODING_SYSTEM_CCL_DECODE(codesys) = sym;
1053 else if (EQ(key, Qencode))
1054 CODING_SYSTEM_CCL_ENCODE(codesys) = sym;
1059 signal_simple_error("Unrecognized property",
1064 if (need_to_setup_eol_systems)
1065 setup_eol_coding_systems(codesys);
1068 Lisp_Object codesys_obj;
1069 XSETCODING_SYSTEM(codesys_obj, codesys);
1070 Fputhash(name, codesys_obj, Vcoding_system_hash_table);
1075 DEFUN("copy-coding-system", Fcopy_coding_system, 2, 2, 0, /*
1076 Copy OLD-CODING-SYSTEM to NEW-NAME.
1077 If NEW-NAME does not name an existing coding system, a new one will
1080 (old_coding_system, new_name))
1082 Lisp_Object new_coding_system;
1083 old_coding_system = Fget_coding_system(old_coding_system);
1084 new_coding_system = Ffind_coding_system(new_name);
1085 if (NILP(new_coding_system)) {
1086 XSETCODING_SYSTEM(new_coding_system,
1087 allocate_coding_system
1088 (XCODING_SYSTEM_TYPE(old_coding_system),
1090 Fputhash(new_name, new_coding_system,
1091 Vcoding_system_hash_table);
1095 Lisp_Coding_System *to = XCODING_SYSTEM(new_coding_system);
1096 Lisp_Coding_System *from = XCODING_SYSTEM(old_coding_system);
1097 memcpy(((char *)to) + sizeof(to->header),
1098 ((char *)from) + sizeof(from->header),
1099 sizeof(*from) - sizeof(from->header));
1100 to->name = new_name;
1102 return new_coding_system;
1105 DEFUN("coding-system-canonical-name-p", Fcoding_system_canonical_name_p, 1, 1, 0, /*
1106 Return t if OBJECT names a coding system, and is not a coding system alias.
1110 Lisp_Object val = Fgethash(object, Vcoding_system_hash_table, Qnil);
1111 return CODING_SYSTEMP(val) ? Qt : Qnil;
1114 DEFUN("coding-system-alias-p", Fcoding_system_alias_p, 1, 1, 0, /*
1115 Return t if OBJECT is a coding system alias.
1116 All coding system aliases are created by `define-coding-system-alias'.
1120 Lisp_Object val = Fgethash(object, Vcoding_system_hash_table, Qzero);
1121 return SYMBOLP(val) ? Qt : Qnil;
1124 DEFUN("coding-system-aliasee", Fcoding_system_aliasee, 1, 1, 0, /*
1125 Return the coding-system symbol for which symbol ALIAS is an alias.
1129 Lisp_Object aliasee = Fgethash(alias, Vcoding_system_hash_table, Qnil);
1130 if (SYMBOLP(aliasee)) {
1133 signal_simple_error(
1134 "Symbol is not a coding system alias", alias);
1136 /* To keep the compiler happy */
1141 append_suffix_to_symbol(Lisp_Object symbol, char *ascii_string)
1143 return Fintern(concat2(Fsymbol_name(symbol),
1144 build_string(ascii_string)), Qnil);
1147 /* A maphash function, for removing dangling coding system aliases. */
1149 dangling_coding_system_alias_p(Lisp_Object alias,
1150 Lisp_Object aliasee, void *dangling_aliases)
1152 if (SYMBOLP(aliasee)
1153 && NILP(Fgethash(aliasee, Vcoding_system_hash_table, Qnil))) {
1154 (*(int *)dangling_aliases)++;
1161 DEFUN("define-coding-system-alias", Fdefine_coding_system_alias, 2, 2, 0, /*
1162 Define symbol ALIAS as an alias for coding system ALIASEE.
1164 You can use this function to redefine an alias that has already been defined,
1165 but you cannot redefine a name which is the canonical name for a coding system.
1166 \(a canonical name of a coding system is what is returned when you call
1167 `coding-system-name' on a coding system).
1169 ALIASEE itself can be an alias, which allows you to define nested aliases.
1171 You are forbidden, however, from creating alias loops or `dangling' aliases.
1172 These will be detected, and an error will be signaled if you attempt to do so.
1174 If ALIASEE is nil, then ALIAS will simply be undefined.
1176 See also `coding-system-alias-p', `coding-system-aliasee',
1177 and `coding-system-canonical-name-p'.
1181 Lisp_Object real_coding_system, probe;
1183 CHECK_SYMBOL(alias);
1185 if (!NILP(Fcoding_system_canonical_name_p(alias)))
1187 ("Symbol is the canonical name of a coding system and cannot be redefined",
1190 if (NILP(aliasee)) {
1191 Lisp_Object subsidiary_unix =
1192 append_suffix_to_symbol(alias, "-unix");
1193 Lisp_Object subsidiary_dos =
1194 append_suffix_to_symbol(alias, "-dos");
1195 Lisp_Object subsidiary_mac =
1196 append_suffix_to_symbol(alias, "-mac");
1198 Fremhash(alias, Vcoding_system_hash_table);
1200 /* Undefine subsidiary aliases,
1201 presumably created by a previous call to this function */
1202 if (!NILP(Fcoding_system_alias_p(subsidiary_unix)) &&
1203 !NILP(Fcoding_system_alias_p(subsidiary_dos)) &&
1204 !NILP(Fcoding_system_alias_p(subsidiary_mac))) {
1205 Fdefine_coding_system_alias(subsidiary_unix, Qnil);
1206 Fdefine_coding_system_alias(subsidiary_dos, Qnil);
1207 Fdefine_coding_system_alias(subsidiary_mac, Qnil);
1210 /* Undefine dangling coding system aliases. */
1212 int dangling_aliases;
1215 dangling_aliases = 0;
1217 (dangling_coding_system_alias_p,
1218 Vcoding_system_hash_table,
1220 } while (dangling_aliases > 0);
1226 if (CODING_SYSTEMP(aliasee))
1227 aliasee = XCODING_SYSTEM_NAME(aliasee);
1229 /* Checks that aliasee names a coding-system */
1230 real_coding_system = Fget_coding_system(aliasee);
1232 /* Check for coding system alias loops */
1233 if (EQ(alias, aliasee))
1234 alias_loop:signal_simple_error_2
1235 ("Attempt to create a coding system alias loop", alias,
1238 for (probe = aliasee;
1240 probe = Fgethash(probe, Vcoding_system_hash_table, Qzero)) {
1241 if (EQ(probe, alias))
1245 Fputhash(alias, aliasee, Vcoding_system_hash_table);
1247 /* Set up aliases for subsidiaries.
1248 #### There must be a better way to handle subsidiary coding
1251 static char *suffixes[] = { "-unix", "-dos", "-mac" };
1253 for (int i = 0; i < countof(suffixes); i++) {
1254 Lisp_Object alias_subsidiary =
1255 append_suffix_to_symbol(alias, suffixes[i]);
1256 Lisp_Object aliasee_subsidiary =
1257 append_suffix_to_symbol(aliasee, suffixes[i]);
1259 if (!NILP(Ffind_coding_system(aliasee_subsidiary))) {
1260 Fdefine_coding_system_alias(alias_subsidiary,
1261 aliasee_subsidiary);
1265 /* FSF return value is a vector of [ALIAS-unix ALIAS-dos ALIAS-mac],
1266 but it doesn't look intentional, so I'd rather return something
1267 meaningful or nothing at all. */
1272 subsidiary_coding_system(Lisp_Object coding_system, eol_type_t type)
1274 Lisp_Coding_System *cs = XCODING_SYSTEM(coding_system);
1275 Lisp_Object new_coding_system;
1277 if (CODING_SYSTEM_EOL_TYPE(cs) != EOL_AUTODETECT)
1278 return coding_system;
1281 case EOL_AUTODETECT:
1282 return coding_system;
1284 new_coding_system = CODING_SYSTEM_EOL_LF(cs);
1287 new_coding_system = CODING_SYSTEM_EOL_CR(cs);
1290 new_coding_system = CODING_SYSTEM_EOL_CRLF(cs);
1297 return NILP(new_coding_system) ? coding_system : new_coding_system;
1300 DEFUN("subsidiary-coding-system", Fsubsidiary_coding_system, 2, 2, 0, /*
1301 Return the subsidiary coding system of CODING-SYSTEM with eol type EOL-TYPE.
1303 (coding_system, eol_type))
1305 coding_system = Fget_coding_system(coding_system);
1307 return subsidiary_coding_system(coding_system,
1308 symbol_to_eol_type(eol_type));
1311 /************************************************************************/
1312 /* Coding system accessors */
1313 /************************************************************************/
1315 DEFUN("coding-system-doc-string", Fcoding_system_doc_string, 1, 1, 0, /*
1316 Return the doc string for CODING-SYSTEM.
1320 coding_system = Fget_coding_system(coding_system);
1321 return XCODING_SYSTEM_DOC_STRING(coding_system);
1324 DEFUN("coding-system-type", Fcoding_system_type, 1, 1, 0, /*
1325 Return the type of CODING-SYSTEM.
1329 Lisp_Object tmp = Fget_coding_system(coding_system);
1331 switch (XCODING_SYSTEM_TYPE(tmp)) {
1335 case CODESYS_AUTODETECT:
1338 case CODESYS_SHIFT_JIS:
1340 case CODESYS_ISO2022:
1351 case CODESYS_NO_CONVERSION:
1352 return Qno_conversion;
1353 #ifdef DEBUG_SXEMACS
1354 case CODESYS_INTERNAL:
1362 Lisp_Object coding_system_charset(Lisp_Object coding_system, int gnum)
1365 = XCODING_SYSTEM_ISO2022_INITIAL_CHARSET(coding_system, gnum);
1367 return CHARSETP(cs) ? XCHARSET_NAME(cs) : Qnil;
1370 DEFUN("coding-system-charset", Fcoding_system_charset, 2, 2, 0, /*
1371 Return initial charset of CODING-SYSTEM designated to GNUM.
1374 (coding_system, gnum))
1376 coding_system = Fget_coding_system(coding_system);
1379 return coding_system_charset(coding_system, XINT(gnum));
1383 DEFUN("coding-system-property", Fcoding_system_property, 2, 2, 0, /*
1384 Return the PROP property of CODING-SYSTEM.
1386 (coding_system, prop))
1389 enum coding_system_type type;
1391 coding_system = Fget_coding_system(coding_system);
1393 type = XCODING_SYSTEM_TYPE(coding_system);
1395 for (i = 0; !ok && i < Dynarr_length(the_codesys_prop_dynarr); i++)
1396 if (EQ(Dynarr_at(the_codesys_prop_dynarr, i).sym, prop)) {
1398 switch (Dynarr_at(the_codesys_prop_dynarr, i).prop_type) {
1399 case CODESYS_PROP_ALL_OK:
1402 case CODESYS_PROP_ISO2022:
1403 if (type != CODESYS_ISO2022)
1405 ("Property only valid in ISO2022 coding systems",
1409 case CODESYS_PROP_CCL:
1410 if (type != CODESYS_CCL)
1412 ("Property only valid in CCL coding systems",
1422 signal_simple_error("Unrecognized property", prop);
1424 if (EQ(prop, Qname))
1425 return XCODING_SYSTEM_NAME(coding_system);
1426 else if (EQ(prop, Qtype))
1427 return Fcoding_system_type(coding_system);
1428 else if (EQ(prop, Qdoc_string))
1429 return XCODING_SYSTEM_DOC_STRING(coding_system);
1430 else if (EQ(prop, Qmnemonic))
1431 return XCODING_SYSTEM_MNEMONIC(coding_system);
1432 else if (EQ(prop, Qeol_type))
1434 eol_type_to_symbol(XCODING_SYSTEM_EOL_TYPE(coding_system));
1435 else if (EQ(prop, Qeol_lf))
1436 return XCODING_SYSTEM_EOL_LF(coding_system);
1437 else if (EQ(prop, Qeol_crlf))
1438 return XCODING_SYSTEM_EOL_CRLF(coding_system);
1439 else if (EQ(prop, Qeol_cr))
1440 return XCODING_SYSTEM_EOL_CR(coding_system);
1441 else if (EQ(prop, Qpost_read_conversion))
1442 return XCODING_SYSTEM_POST_READ_CONVERSION(coding_system);
1443 else if (EQ(prop, Qpre_write_conversion))
1444 return XCODING_SYSTEM_PRE_WRITE_CONVERSION(coding_system);
1446 else if (type == CODESYS_ISO2022) {
1447 if (EQ(prop, Qcharset_g0))
1448 return coding_system_charset(coding_system, 0);
1449 else if (EQ(prop, Qcharset_g1))
1450 return coding_system_charset(coding_system, 1);
1451 else if (EQ(prop, Qcharset_g2))
1452 return coding_system_charset(coding_system, 2);
1453 else if (EQ(prop, Qcharset_g3))
1454 return coding_system_charset(coding_system, 3);
1456 #define FORCE_CHARSET(charset_num) \
1457 (XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT \
1458 (coding_system, charset_num) ? Qt : Qnil)
1460 else if (EQ(prop, Qforce_g0_on_output))
1461 return FORCE_CHARSET(0);
1462 else if (EQ(prop, Qforce_g1_on_output))
1463 return FORCE_CHARSET(1);
1464 else if (EQ(prop, Qforce_g2_on_output))
1465 return FORCE_CHARSET(2);
1466 else if (EQ(prop, Qforce_g3_on_output))
1467 return FORCE_CHARSET(3);
1469 #define LISP_BOOLEAN(prop) \
1470 (XCODING_SYSTEM_ISO2022_##prop (coding_system) ? Qt : Qnil)
1472 else if (EQ(prop, Qshort))
1473 return LISP_BOOLEAN(SHORT);
1474 else if (EQ(prop, Qno_ascii_eol))
1475 return LISP_BOOLEAN(NO_ASCII_EOL);
1476 else if (EQ(prop, Qno_ascii_cntl))
1477 return LISP_BOOLEAN(NO_ASCII_CNTL);
1478 else if (EQ(prop, Qseven))
1479 return LISP_BOOLEAN(SEVEN);
1480 else if (EQ(prop, Qlock_shift))
1481 return LISP_BOOLEAN(LOCK_SHIFT);
1482 else if (EQ(prop, Qno_iso6429))
1483 return LISP_BOOLEAN(NO_ISO6429);
1484 else if (EQ(prop, Qescape_quoted))
1485 return LISP_BOOLEAN(ESCAPE_QUOTED);
1487 else if (EQ(prop, Qinput_charset_conversion))
1489 unparse_charset_conversion_specs
1490 (XCODING_SYSTEM(coding_system)->iso2022.input_conv);
1491 else if (EQ(prop, Qoutput_charset_conversion))
1493 unparse_charset_conversion_specs
1494 (XCODING_SYSTEM(coding_system)->iso2022.
1498 } else if (type == CODESYS_CCL) {
1499 if (EQ(prop, Qdecode))
1500 return XCODING_SYSTEM_CCL_DECODE(coding_system);
1501 else if (EQ(prop, Qencode))
1502 return XCODING_SYSTEM_CCL_ENCODE(coding_system);
1510 return Qnil; /* not reached */
1513 /************************************************************************/
1514 /* Coding category functions */
1515 /************************************************************************/
1517 static int decode_coding_category(Lisp_Object symbol)
1521 CHECK_SYMBOL(symbol);
1522 for (i = 0; i < CODING_CATEGORY_LAST; i++)
1523 if (EQ(coding_category_symbol[i], symbol))
1526 signal_simple_error("Unrecognized coding category", symbol);
1527 return 0; /* not reached */
1530 DEFUN("coding-category-list", Fcoding_category_list, 0, 0, 0, /*
1531 Return a list of all recognized coding categories.
1536 Lisp_Object list = Qnil;
1538 for (i = CODING_CATEGORY_LAST - 1; i >= 0; i--)
1539 list = Fcons(coding_category_symbol[i], list);
1543 DEFUN("set-coding-priority-list", Fset_coding_priority_list, 1, 1, 0, /*
1544 Change the priority order of the coding categories.
1545 LIST should be list of coding categories, in descending order of
1546 priority. Unspecified coding categories will be lower in priority
1547 than all specified ones, in the same relative order they were in
1552 int category_to_priority[CODING_CATEGORY_LAST];
1556 /* First generate a list that maps coding categories to priorities. */
1558 for (i = 0; i < CODING_CATEGORY_LAST; i++)
1559 category_to_priority[i] = -1;
1561 /* Highest priority comes from the specified list. */
1563 EXTERNAL_LIST_LOOP(rest, list) {
1564 int cat = decode_coding_category(XCAR(rest));
1566 if (category_to_priority[cat] >= 0)
1567 signal_simple_error("Duplicate coding category in list",
1569 category_to_priority[cat] = i++;
1572 /* Now go through the existing categories by priority to retrieve
1573 the categories not yet specified and preserve their priority
1575 for (j = 0; j < CODING_CATEGORY_LAST; j++) {
1576 int cat = fcd->coding_category_by_priority[j];
1577 if (category_to_priority[cat] < 0)
1578 category_to_priority[cat] = i++;
1581 /* Now we need to construct the inverse of the mapping we just
1584 for (i = 0; i < CODING_CATEGORY_LAST; i++)
1585 fcd->coding_category_by_priority[category_to_priority[i]] = i;
1587 /* Phew! That was confusing. */
1591 DEFUN("coding-priority-list", Fcoding_priority_list, 0, 0, 0, /*
1592 Return a list of coding categories in descending order of priority.
1597 Lisp_Object list = Qnil;
1599 for (i = CODING_CATEGORY_LAST - 1; i >= 0; i--)
1601 Fcons(coding_category_symbol
1602 [fcd->coding_category_by_priority[i]], list);
1606 DEFUN("set-coding-category-system", Fset_coding_category_system, 2, 2, 0, /*
1607 Change the coding system associated with a coding category.
1609 (coding_category, coding_system))
1611 int cat = decode_coding_category(coding_category);
1613 coding_system = Fget_coding_system(coding_system);
1614 fcd->coding_category_system[cat] = coding_system;
1618 DEFUN("coding-category-system", Fcoding_category_system, 1, 1, 0, /*
1619 Return the coding system associated with a coding category.
1623 int cat = decode_coding_category(coding_category);
1624 Lisp_Object sys = fcd->coding_category_system[cat];
1627 return XCODING_SYSTEM_NAME(sys);
1631 /************************************************************************/
1632 /* Detecting the encoding of data */
1633 /************************************************************************/
1635 struct detection_state {
1636 eol_type_t eol_type;
1663 struct iso2022_decoder iso;
1665 int high_byte_count;
1666 unsigned int saw_single_shift:1;
1675 static int acceptable_control_char_p(int c)
1678 /* Allow and ignore control characters that you might
1679 reasonably see in a text file */
1684 case 8: /* backspace */
1685 case 11: /* vertical tab */
1686 case 12: /* form feed */
1687 case 26: /* MS-DOS C-z junk */
1688 case 31: /* '^_' -- for info */
1695 static int mask_has_at_most_one_bit_p(int mask)
1697 /* Perhaps the only thing useful you learn from intensive Microsoft
1698 technical interviews */
1699 return (mask & (mask - 1)) == 0;
1703 detect_eol_type(struct detection_state *st, const Extbyte * src,
1704 Lstream_data_count n)
1707 const unsigned char c = *(const unsigned char*)src++;
1709 if (st->eol.just_saw_cr)
1711 else if (st->eol.seen_anything)
1713 } else if (st->eol.just_saw_cr)
1716 st->eol.just_saw_cr = 1;
1718 st->eol.just_saw_cr = 0;
1719 st->eol.seen_anything = 1;
1722 return EOL_AUTODETECT;
1725 /* Attempt to determine the encoding and EOL type of the given text.
1726 Before calling this function for the first type, you must initialize
1727 st->eol_type as appropriate and initialize st->mask to ~0.
1729 st->eol_type holds the determined EOL type, or EOL_AUTODETECT if
1732 st->mask holds the determined coding category mask, or ~0 if only
1733 ASCII has been seen so far.
1737 0 == st->eol_type is EOL_AUTODETECT and/or more than coding category
1738 is present in st->mask
1739 1 == definitive answers are here for both st->eol_type and st->mask
1743 detect_coding_type(struct detection_state *st, const Extbyte * src,
1744 Lstream_data_count n, int just_do_eol)
1746 if (st->eol_type == EOL_AUTODETECT)
1747 st->eol_type = detect_eol_type(st, src, n);
1750 return st->eol_type != EOL_AUTODETECT;
1752 if (!st->seen_non_ascii) {
1753 for (; n; n--, src++) {
1754 const unsigned char c = *(const unsigned char *)src;
1755 if ((c < 0x20 && !acceptable_control_char_p(c))
1757 st->seen_non_ascii = 1;
1759 st->shift_jis.mask = ~0;
1763 st->iso2022.mask = ~0;
1774 if (!mask_has_at_most_one_bit_p(st->iso2022.mask))
1775 st->iso2022.mask = detect_coding_iso2022(st, src, n);
1776 if (!mask_has_at_most_one_bit_p(st->shift_jis.mask))
1777 st->shift_jis.mask = detect_coding_sjis(st, src, n);
1778 if (!mask_has_at_most_one_bit_p(st->big5.mask))
1779 st->big5.mask = detect_coding_big5(st, src, n);
1780 if (!mask_has_at_most_one_bit_p(st->utf8.mask))
1781 st->utf8.mask = detect_coding_utf8(st, src, n);
1782 if (!mask_has_at_most_one_bit_p(st->ucs4.mask))
1783 st->ucs4.mask = detect_coding_ucs4(st, src, n);
1785 st->mask = st->iso2022.mask | st->shift_jis.mask | st->big5.mask
1786 | st->utf8.mask | st->ucs4.mask;
1789 int retval = mask_has_at_most_one_bit_p(st->mask);
1790 st->mask |= CODING_CATEGORY_NO_CONVERSION_MASK;
1791 return retval && st->eol_type != EOL_AUTODETECT;
1795 static Lisp_Object coding_system_from_mask(int mask)
1798 /* If the file was entirely or basically ASCII, use the
1799 default value of `buffer-file-coding-system'. */
1800 Lisp_Object retval =
1801 XBUFFER(Vbuffer_defaults)->buffer_file_coding_system;
1802 if (!NILP(retval)) {
1803 retval = Ffind_coding_system(retval);
1806 (Qbad_variable, Qwarning,
1807 "Invalid `default-buffer-file-coding-system', set to nil");
1808 XBUFFER(Vbuffer_defaults)->
1809 buffer_file_coding_system = Qnil;
1813 retval = Fget_coding_system(Qraw_text);
1819 mask = postprocess_iso2022_mask(mask);
1821 /* Look through the coding categories by priority and find
1822 the first one that is allowed. */
1823 for (i = 0; i < CODING_CATEGORY_LAST; i++) {
1824 cat = fcd->coding_category_by_priority[i];
1827 if ((mask & (1 << cat)) &&
1828 !NILP(fcd->coding_category_system[cat]))
1832 return fcd->coding_category_system[cat];
1834 return Fget_coding_system(Qraw_text);
1838 /* Given a seekable read stream and potential coding system and EOL type
1839 as specified, do any autodetection that is called for. If the
1840 coding system and/or EOL type are not `autodetect', they will be left
1841 alone; but this function will never return an autodetect coding system
1844 This function does not automatically fetch subsidiary coding systems;
1845 that should be unnecessary with the explicit eol-type argument. */
1847 #define LENGTH(string_constant) (sizeof (string_constant) - 1)
1848 /* number of leading lines to check for a coding cookie */
1849 #define LINES_TO_CHECK 2
1852 determine_real_coding_system(lstream_t stream, Lisp_Object * codesys_in_out,
1853 eol_type_t * eol_type_in_out)
1855 struct detection_state decst;
1857 if (*eol_type_in_out == EOL_AUTODETECT)
1858 *eol_type_in_out = XCODING_SYSTEM_EOL_TYPE(*codesys_in_out);
1861 decst.eol_type = *eol_type_in_out;
1864 /* If autodetection is called for, do it now. */
1865 if (XCODING_SYSTEM_TYPE(*codesys_in_out) == CODESYS_AUTODETECT
1866 || *eol_type_in_out == EOL_AUTODETECT) {
1868 Lisp_Object coding_system = Qnil;
1870 Lstream_data_count nread =
1871 Lstream_read(stream, buf, sizeof(buf));
1873 int lines_checked = 0;
1875 /* Look for initial "-*-"; mode line prefix */
1877 scan_end = buf + nread - LENGTH("-*-coding:?-*-");
1878 p <= scan_end && lines_checked < LINES_TO_CHECK; p++)
1879 if (*p == '-' && *(p + 1) == '*' && *(p + 2) == '-') {
1880 Extbyte *local_vars_beg = p + 3;
1881 /* Look for final "-*-"; mode line suffix */
1882 for (p = local_vars_beg, scan_end = buf + nread - LENGTH("-*-");
1883 p <= scan_end && lines_checked < LINES_TO_CHECK; p++)
1884 if (*p == '-' && *(p + 1) == '*' && *(p + 2) == '-') {
1885 Extbyte *suffix = p;
1886 /* Look for "coding:" */
1887 for (p = local_vars_beg, scan_end = suffix - LENGTH("coding:?");
1889 if (memcmp("coding:", p, LENGTH("coding:")) == 0
1890 && (p == local_vars_beg
1893 || *(p - 1) == ';'))) {
1896 p += LENGTH("coding:");
1897 while (*p == ' ' || *p == '\t') {
1901 /* Get coding system name */
1904 /* Characters valid in a MIME charset name (rfc 1521),
1905 and in a Lisp symbol name. */
1906 n = strspn((char *)p,
1907 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1908 "abcdefghijklmnopqrstuvwxyz"
1915 coding_system = Ffind_coding_system(intern((char *)p));
1922 /* #### file must use standard EOLs or we miss 2d line */
1923 /* #### not to mention this is broken for UTF-16 DOS files */
1924 else if (*p == '\n' || *p == '\r') {
1926 /* skip past multibyte (DOS) newline */
1928 && *(p + 1) == '\n')
1933 /* #### file must use standard EOLs or we miss 2d line */
1934 /* #### not to mention this is broken for UTF-16 DOS files */
1935 else if (*p == '\n' || *p == '\r') {
1937 /* skip past multibyte (DOS) newline */
1938 if (*p == '\r' && *(p + 1) == '\n')
1942 if (NILP(coding_system))
1944 if (detect_coding_type(&decst, buf, nread,
1945 XCODING_SYSTEM_TYPE(*codesys_in_out)
1946 != CODESYS_AUTODETECT))
1948 nread = Lstream_read(stream, buf, sizeof(buf));
1954 else if (XCODING_SYSTEM_TYPE(*codesys_in_out) == CODESYS_AUTODETECT
1955 && XCODING_SYSTEM_EOL_TYPE(coding_system) == EOL_AUTODETECT)
1957 if (detect_coding_type(&decst, buf, nread, 1))
1959 nread = Lstream_read(stream, buf, sizeof(buf));
1965 *eol_type_in_out = decst.eol_type;
1966 if (XCODING_SYSTEM_TYPE(*codesys_in_out) == CODESYS_AUTODETECT) {
1967 if (NILP(coding_system))
1969 coding_system_from_mask(decst.mask);
1971 *codesys_in_out = coding_system;
1975 /* If we absolutely can't determine the EOL type, just assume LF. */
1976 if (*eol_type_in_out == EOL_AUTODETECT)
1977 *eol_type_in_out = EOL_LF;
1979 Lstream_rewind(stream);
1982 DEFUN("detect-coding-region", Fdetect_coding_region, 2, 3, 0, /*
1983 Detect coding system of the text in the region between START and END.
1984 Return a list of possible coding systems ordered by priority.
1985 If only ASCII characters are found, return 'undecided or one of
1986 its subsidiary coding systems according to a detected end-of-line
1987 type. Optional arg BUFFER defaults to the current buffer.
1989 (start, end, buffer))
1991 Lisp_Object val = Qnil;
1992 struct buffer *buf = decode_buffer(buffer, 0);
1994 Lisp_Object instream, lb_instream;
1995 lstream_t istr, lb_istr;
1996 struct detection_state decst;
1997 struct gcpro gcpro1, gcpro2;
1999 get_buffer_range_char(buf, start, end, &b, &e, 0);
2000 lb_instream = make_lisp_buffer_input_stream(buf, b, e, 0);
2001 lb_istr = XLSTREAM(lb_instream);
2003 make_encoding_input_stream(lb_istr, Fget_coding_system(Qbinary));
2004 istr = XLSTREAM(instream);
2005 GCPRO2(instream, lb_instream);
2007 decst.eol_type = EOL_AUTODETECT;
2010 Extbyte random_buffer[4096];
2011 Lstream_data_count nread =
2012 Lstream_read(istr, random_buffer, sizeof(random_buffer));
2016 if (detect_coding_type(&decst, random_buffer, nread, 0))
2020 if (decst.mask == ~0)
2021 val = subsidiary_coding_system(Fget_coding_system(Qundecided),
2028 decst.mask = postprocess_iso2022_mask(decst.mask);
2030 for (i = CODING_CATEGORY_LAST - 1; i >= 0; i--) {
2031 int sys = fcd->coding_category_by_priority[i];
2032 if (decst.mask & (1 << sys)) {
2033 Lisp_Object codesys =
2034 fcd->coding_category_system[sys];
2037 subsidiary_coding_system(codesys,
2040 val = Fcons(codesys, val);
2044 Lstream_close(istr);
2046 Lstream_delete(istr);
2047 Lstream_delete(lb_istr);
2051 /************************************************************************/
2052 /* Converting to internal Mule format ("decoding") */
2053 /************************************************************************/
2055 /* A decoding stream is a stream used for decoding text (i.e.
2056 converting from some external format to internal format).
2057 The decoding-stream object keeps track of the actual coding
2058 stream, the stream that is at the other end, and data that
2059 needs to be persistent across the lifetime of the stream. */
2061 /* Handle the EOL stuff related to just-read-in character C.
2062 EOL_TYPE is the EOL type of the coding stream.
2063 FLAGS is the current value of FLAGS in the coding stream, and may
2064 be modified by this macro. (The macro only looks at the
2065 CODING_STATE_CR flag.) DST is the Dynarr to which the decoded
2066 bytes are to be written. You need to also define a local goto
2067 label "label_continue_loop" that is at the end of the main
2068 character-reading loop.
2070 If C is a CR character, then this macro handles it entirely and
2071 jumps to label_continue_loop. Otherwise, this macro does not add
2072 anything to DST, and continues normally. You should continue
2073 processing C normally after this macro. */
2075 #define DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst) \
2079 if (eol_type == EOL_CR) \
2080 Dynarr_add (dst, '\n'); \
2081 else if (eol_type != EOL_CRLF || flags & CODING_STATE_CR) \
2082 Dynarr_add (dst, c); \
2084 flags |= CODING_STATE_CR; \
2085 goto label_continue_loop; \
2087 else if (flags & CODING_STATE_CR) \
2088 { /* eol_type == CODING_SYSTEM_EOL_CRLF */ \
2090 Dynarr_add (dst, '\r'); \
2091 flags &= ~CODING_STATE_CR; \
2095 /* C should be a binary character in the range 0 - 255; convert
2096 to internal format and add to Dynarr DST. */
2098 #define DECODE_ADD_BINARY_CHAR(c, dst) \
2100 if (BYTE_ASCII_P (c)) \
2101 Dynarr_add (dst, c); \
2102 else if (BYTE_C1_P (c)) \
2104 Dynarr_add (dst, LEADING_BYTE_CONTROL_1); \
2105 Dynarr_add (dst, c + 0x20); \
2109 Dynarr_add (dst, LEADING_BYTE_LATIN_ISO8859_1); \
2110 Dynarr_add (dst, c); \
2114 #define DECODE_OUTPUT_PARTIAL_CHAR(ch) \
2118 DECODE_ADD_BINARY_CHAR (ch, dst); \
2123 #define DECODE_HANDLE_END_OF_CONVERSION(flags, ch, dst) \
2125 if (flags & CODING_STATE_END) \
2127 DECODE_OUTPUT_PARTIAL_CHAR (ch); \
2128 if (flags & CODING_STATE_CR) \
2129 Dynarr_add (dst, '\r'); \
2133 #define DECODING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, decoding)
2135 typedef struct decoding_stream_s *decoding_stream_t;
2136 struct decoding_stream_s {
2137 /* Coding system that governs the conversion. */
2138 Lisp_Coding_System *codesys;
2140 /* Stream that we read the encoded data from or
2141 write the decoded data to. */
2142 lstream_t other_end;
2144 /* If we are reading, then we can return only a fixed amount of
2145 data, so if the conversion resulted in too much data, we store it
2146 here for retrieval the next time around. */
2147 unsigned_char_dynarr *runoff;
2149 /* FLAGS holds flags indicating the current state of the decoding.
2150 Some of these flags are dependent on the coding system. */
2153 /* CH holds a partially built-up character. Since we only deal
2154 with one- and two-byte characters at the moment, we only use
2155 this to store the first byte of a two-byte character. */
2158 /* EOL_TYPE specifies the type of end-of-line conversion that
2159 currently applies. We need to keep this separate from the
2160 EOL type stored in CODESYS because the latter might indicate
2161 automatic EOL-type detection while the former will always
2162 indicate a particular EOL type. */
2163 eol_type_t eol_type;
2165 /* Additional ISO2022 information. We define the structure above
2166 because it's also needed by the detection routines. */
2167 struct iso2022_decoder iso2022;
2169 /* Additional information (the state of the running CCL program)
2170 used by the CCL decoder. */
2171 struct ccl_program ccl;
2173 /* counter for UTF-8 or UCS-4 */
2174 unsigned char counter;
2176 struct detection_state decst;
2179 static Lstream_data_count
2180 decoding_reader(lstream_t stream, unsigned char *data, Lstream_data_count size);
2181 static Lstream_data_count
2182 decoding_writer(lstream_t stream,
2183 const unsigned char *data, Lstream_data_count size);
2184 static int decoding_rewinder(lstream_t stream);
2185 static int decoding_seekable_p(lstream_t stream);
2186 static int decoding_flusher(lstream_t stream);
2187 static int decoding_closer(lstream_t stream);
2189 static Lisp_Object decoding_marker(Lisp_Object stream);
2191 DEFINE_LSTREAM_IMPLEMENTATION("decoding", lstream_decoding,
2192 sizeof(struct decoding_stream_s));
2195 decoding_marker(Lisp_Object stream)
2197 lstream_t str = DECODING_STREAM_DATA(XLSTREAM(stream))->other_end;
2198 Lisp_Object str_obj;
2200 /* We do not need to mark the coding systems or charsets stored
2201 within the stream because they are stored in a global list
2202 and automatically marked. */
2204 XSETLSTREAM(str_obj, str);
2205 mark_object(str_obj);
2206 if (str->imp->marker) {
2207 return str->imp->marker(str_obj);
2213 /* Read SIZE bytes of data and store it into DATA. We are a decoding stream
2214 so we read data from the other end, decode it, and store it into DATA. */
2216 static Lstream_data_count
2217 decoding_reader(lstream_t stream, unsigned char *data, Lstream_data_count size)
2219 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2220 unsigned char *orig_data = data;
2221 Lstream_data_count read_size;
2222 int error_occurred = 0;
2224 /* We need to interface to mule_decode(), which expects to take some
2225 amount of data and store the result into a Dynarr. We have
2226 mule_decode() store into str->runoff, and take data from there
2229 /* We loop until we have enough data, reading chunks from the other
2230 end and decoding it. */
2232 /* Take data from the runoff if we can. Make sure to take at
2233 most SIZE bytes, and delete the data from the runoff. */
2234 if (Dynarr_length(str->runoff) > 0) {
2235 Lstream_data_count chunk =
2237 (Lstream_data_count)
2238 Dynarr_length(str->runoff));
2239 memcpy(data, Dynarr_atp(str->runoff, 0), chunk);
2240 Dynarr_delete_many(str->runoff, 0, chunk);
2246 /* No more room for data */
2250 if (str->flags & CODING_STATE_END) {
2251 /* This means that on the previous iteration, we hit the
2252 EOF on the other end. We loop once more so that
2253 mule_decode() can output any final stuff it may be
2254 holding, or any "go back to a sane state" escape
2255 sequences. (This latter makes sense during
2260 /* Exhausted the runoff, so get some more. DATA has at least
2261 SIZE bytes left of storage in it, so it's OK to read directly
2262 into it. (We'll be overwriting above, after we've decoded it
2263 into the runoff.) */
2264 read_size = Lstream_read(str->other_end, data, size);
2265 if (read_size < 0) {
2269 if (read_size == 0) {
2270 /* There might be some more end data produced in the
2271 translation. See the comment above. */
2272 str->flags |= CODING_STATE_END;
2274 mule_decode(stream, (Extbyte *) data, str->runoff, read_size);
2277 if (data - orig_data == 0) {
2278 return error_occurred ? -1 : 0;
2280 return data - orig_data;
2284 static Lstream_data_count
2285 decoding_writer(lstream_t stream, const unsigned char *data,
2286 Lstream_data_count size)
2288 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2289 Lstream_data_count retval;
2291 /* Decode all our data into the runoff, and then attempt to write
2292 it all out to the other end. Remove whatever chunk we succeeded
2294 mule_decode(stream, (const Extbyte *)data, str->runoff, size);
2295 retval = Lstream_write(str->other_end, Dynarr_atp(str->runoff, 0),
2296 Dynarr_length(str->runoff));
2298 Dynarr_delete_many(str->runoff, 0, retval);
2300 /* Do NOT return retval. The return value indicates how much
2301 of the incoming data was written, not how many bytes were
2307 reset_decoding_stream(decoding_stream_t str)
2310 if (CODING_SYSTEM_TYPE(str->codesys) == CODESYS_ISO2022) {
2311 Lisp_Object coding_system;
2312 XSETCODING_SYSTEM(coding_system, str->codesys);
2313 reset_iso2022(coding_system, &str->iso2022);
2314 } else if (CODING_SYSTEM_TYPE(str->codesys) == CODESYS_CCL) {
2315 setup_ccl_program(&str->ccl,
2316 CODING_SYSTEM_CCL_DECODE(str->codesys));
2320 if (CODING_SYSTEM_TYPE(str->codesys) == CODESYS_AUTODETECT
2321 || CODING_SYSTEM_EOL_TYPE(str->codesys) == EOL_AUTODETECT) {
2323 str->decst.eol_type = EOL_AUTODETECT;
2324 str->decst.mask = ~0;
2326 str->flags = str->ch = 0;
2330 decoding_rewinder(lstream_t stream)
2332 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2333 reset_decoding_stream(str);
2334 Dynarr_reset(str->runoff);
2335 return Lstream_rewind(str->other_end);
2339 decoding_seekable_p(lstream_t stream)
2341 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2342 return Lstream_seekable_p(str->other_end);
2346 decoding_flusher(lstream_t stream)
2348 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2349 return Lstream_flush(str->other_end);
2353 decoding_closer(lstream_t stream)
2355 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2356 if (stream->flags & LSTREAM_FL_WRITE) {
2357 str->flags |= CODING_STATE_END;
2358 decoding_writer(stream, 0, 0);
2360 Dynarr_free(str->runoff);
2362 #ifdef ENABLE_COMPOSITE_CHARS
2363 if (str->iso2022.composite_chars) {
2364 Dynarr_free(str->iso2022.composite_chars);
2368 return Lstream_close(str->other_end);
2372 decoding_stream_coding_system(lstream_t stream)
2374 Lisp_Object coding_system;
2375 decoding_stream_t str = DECODING_STREAM_DATA(stream);
2377 XSETCODING_SYSTEM(coding_system, str->codesys);
2378 return subsidiary_coding_system(coding_system, str->eol_type);
2382 set_decoding_stream_coding_system(lstream_t lstr, Lisp_Object codesys)
2384 Lisp_Coding_System *cs = XCODING_SYSTEM(codesys);
2385 decoding_stream_t str = DECODING_STREAM_DATA(lstr);
2387 if (CODING_SYSTEM_EOL_TYPE(cs) != EOL_AUTODETECT) {
2388 str->eol_type = CODING_SYSTEM_EOL_TYPE(cs);
2390 reset_decoding_stream(str);
2394 /* WARNING WARNING WARNING WARNING!!!!! If you open up a decoding
2395 stream for writing, no automatic code detection will be performed.
2396 The reason for this is that automatic code detection requires a
2397 seekable input. Things will also fail if you open a decoding
2398 stream for reading using a non-fully-specified coding system and
2399 a non-seekable input stream. */
2402 make_decoding_stream_1(lstream_t stream, Lisp_Object codesys, const char *mode)
2404 lstream_t lstr = Lstream_new(lstream_decoding, mode);
2405 decoding_stream_t str = DECODING_STREAM_DATA(lstr);
2409 str->other_end = stream;
2410 str->runoff = (unsigned_char_dynarr *) Dynarr_new(unsigned_char);
2411 str->eol_type = EOL_AUTODETECT;
2412 if (!strcmp(mode, "r") && Lstream_seekable_p(stream)) {
2413 /* We can determine the coding system now. */
2414 determine_real_coding_system(stream, &codesys, &str->eol_type);
2416 set_decoding_stream_coding_system(lstr, codesys);
2417 str->decst.eol_type = str->eol_type;
2418 str->decst.mask = ~0;
2419 XSETLSTREAM(obj, lstr);
2424 make_decoding_input_stream(lstream_t stream, Lisp_Object codesys)
2426 return make_decoding_stream_1(stream, codesys, "r");
2430 make_decoding_output_stream(lstream_t stream, Lisp_Object codesys)
2432 return make_decoding_stream_1(stream, codesys, "w");
2435 /* Note: the decode_coding_* functions all take the same
2436 arguments as mule_decode(), which is to say some SRC data of
2437 size N, which is to be stored into dynamic array DST.
2438 DECODING is the stream within which the decoding is
2439 taking place, but no data is actually read from or
2440 written to that stream; that is handled in decoding_reader()
2441 or decoding_writer(). This allows the same functions to
2442 be used for both reading and writing. */
2445 mule_decode(lstream_t decoding, const Extbyte * src,
2446 unsigned_char_dynarr * dst, Lstream_data_count n)
2448 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
2450 /* If necessary, do encoding-detection now. We do this when
2451 we're a writing stream or a non-seekable reading stream,
2452 meaning that we can't just process the whole input,
2453 rewind, and start over. */
2455 if (CODING_SYSTEM_TYPE(str->codesys) == CODESYS_AUTODETECT ||
2456 str->eol_type == EOL_AUTODETECT) {
2457 Lisp_Object codesys;
2459 XSETCODING_SYSTEM(codesys, str->codesys);
2460 detect_coding_type(&str->decst, src, n,
2461 CODING_SYSTEM_TYPE(str->codesys) !=
2462 CODESYS_AUTODETECT);
2463 if (CODING_SYSTEM_TYPE(str->codesys) == CODESYS_AUTODETECT &&
2464 str->decst.mask != ~0)
2465 /* #### This is cheesy. What we really ought to do is
2466 buffer up a certain amount of data so as to get a
2467 less random result. */
2468 codesys = coding_system_from_mask(str->decst.mask);
2469 str->eol_type = str->decst.eol_type;
2470 if (XCODING_SYSTEM(codesys) != str->codesys) {
2471 /* Preserve the CODING_STATE_END flag in case it was set.
2472 If we erase it, bad things might happen. */
2473 int was_end = str->flags & CODING_STATE_END;
2474 set_decoding_stream_coding_system(decoding, codesys);
2476 str->flags |= CODING_STATE_END;
2480 switch (CODING_SYSTEM_TYPE(str->codesys)) {
2481 #ifdef DEBUG_SXEMACS
2482 case CODESYS_INTERNAL:
2483 Dynarr_add_many(dst, src, n);
2486 case CODESYS_AUTODETECT:
2487 /* If we got this far and still haven't decided on the coding
2488 system, then do no conversion. */
2489 case CODESYS_NO_CONVERSION:
2490 decode_coding_no_conversion(decoding, src, dst, n);
2493 case CODESYS_SHIFT_JIS:
2494 decode_coding_sjis(decoding, src, dst, n);
2497 decode_coding_big5(decoding, src, dst, n);
2500 decode_coding_ucs4(decoding, src, dst, n);
2503 decode_coding_utf8(decoding, src, dst, n);
2506 str->ccl.last_block = str->flags & CODING_STATE_END;
2507 /* When applying ccl program to stream, MUST NOT set NULL
2509 ccl_driver(&str->ccl,
2511 ? (const unsigned char *)src
2512 : (const unsigned char *)""),
2513 dst, n, 0, CCL_MODE_DECODING);
2515 case CODESYS_ISO2022:
2516 decode_coding_iso2022(decoding, src, dst, n);
2524 DEFUN("decode-coding-region", Fdecode_coding_region, 3, 4, 0, /*
2525 Decode the text between START and END which is encoded in CODING-SYSTEM.
2526 This is useful if you've read in encoded text from a file without decoding
2527 it (e.g. you read in a JIS-formatted file but used the `binary' or
2528 `no-conversion' coding system, so that it shows up as "^[$B!<!+^[(B").
2529 Return length of decoded text.
2530 BUFFER defaults to the current buffer if unspecified.
2532 (start, end, coding_system, buffer))
2535 struct buffer *buf = decode_buffer(buffer, 0);
2536 Lisp_Object instream, lb_outstream, de_outstream, outstream;
2537 lstream_t istr, ostr;
2538 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
2540 get_buffer_range_char(buf, start, end, &b, &e, 0);
2542 barf_if_buffer_read_only(buf, b, e);
2544 coding_system = Fget_coding_system(coding_system);
2545 instream = make_lisp_buffer_input_stream(buf, b, e, 0);
2546 lb_outstream = make_lisp_buffer_output_stream(buf, b, 0);
2547 de_outstream = make_decoding_output_stream(XLSTREAM(lb_outstream),
2549 outstream = make_encoding_output_stream(XLSTREAM(de_outstream),
2550 Fget_coding_system(Qbinary));
2551 istr = XLSTREAM(instream);
2552 ostr = XLSTREAM(outstream);
2553 GCPRO4(instream, lb_outstream, de_outstream, outstream);
2555 /* The chain of streams looks like this:
2557 [BUFFER] <----- send through
2558 ------> [ENCODE AS BINARY]
2559 ------> [DECODE AS SPECIFIED]
2564 char tempbuf[1024]; /* some random amount */
2565 Bufpos newpos, even_newer_pos;
2566 Bufpos oldpos = lisp_buffer_stream_startpos(istr);
2567 Lstream_data_count size_in_bytes =
2568 Lstream_read(istr, tempbuf, sizeof(tempbuf));
2572 newpos = lisp_buffer_stream_startpos(istr);
2573 Lstream_write(ostr, tempbuf, size_in_bytes);
2574 even_newer_pos = lisp_buffer_stream_startpos(istr);
2575 buffer_delete_range(buf, even_newer_pos - (newpos - oldpos),
2578 Lstream_close(istr);
2579 Lstream_close(ostr);
2581 Lstream_delete(istr);
2582 Lstream_delete(ostr);
2583 Lstream_delete(XLSTREAM(de_outstream));
2584 Lstream_delete(XLSTREAM(lb_outstream));
2588 /************************************************************************/
2589 /* Converting to an external encoding ("encoding") */
2590 /************************************************************************/
2592 /* An encoding stream is an output stream. When you create the
2593 stream, you specify the coding system that governs the encoding
2594 and another stream that the resulting encoded data is to be
2595 sent to, and then start sending data to it. */
2597 #define ENCODING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, encoding)
2599 typedef struct encoding_stream_s *encoding_stream_t;
2600 struct encoding_stream_s {
2601 /* Coding system that governs the conversion. */
2602 Lisp_Coding_System *codesys;
2604 /* Stream that we read the encoded data from or
2605 write the decoded data to. */
2606 lstream_t other_end;
2608 /* If we are reading, then we can return only a fixed amount of
2609 data, so if the conversion resulted in too much data, we store it
2610 here for retrieval the next time around. */
2611 unsigned_char_dynarr *runoff;
2613 /* FLAGS holds flags indicating the current state of the encoding.
2614 Some of these flags are dependent on the coding system. */
2617 /* CH holds a partially built-up character. Since we only deal
2618 with one- and two-byte characters at the moment, we only use
2619 this to store the first byte of a two-byte character. */
2622 /* Additional information used by the ISO2022 encoder. */
2624 /* CHARSET holds the character sets currently assigned to the G0
2625 through G3 registers. It is initialized from the array
2626 INITIAL_CHARSET in CODESYS. */
2627 Lisp_Object charset[4];
2629 /* Which registers are currently invoked into the left (GL) and
2630 right (GR) halves of the 8-bit encoding space? */
2631 int register_left, register_right;
2633 /* Whether we need to explicitly designate the charset in the
2634 G? register before using it. It is initialized from the
2635 array FORCE_CHARSET_ON_OUTPUT in CODESYS. */
2636 unsigned char force_charset_on_output[4];
2638 /* Other state variables that need to be preserved across
2640 Lisp_Object current_charset;
2642 int current_char_boundary;
2645 /* Additional information (the state of the running CCL program)
2646 used by the CCL encoder. */
2647 struct ccl_program ccl;
2651 static Lstream_data_count
2652 encoding_reader(lstream_t stream, unsigned char *data, Lstream_data_count size);
2653 static Lstream_data_count
2654 encoding_writer(lstream_t stream,
2655 const unsigned char *data, Lstream_data_count size);
2656 static int encoding_rewinder(lstream_t stream);
2657 static int encoding_seekable_p(lstream_t stream);
2658 static int encoding_flusher(lstream_t stream);
2659 static int encoding_closer(lstream_t stream);
2661 static Lisp_Object encoding_marker(Lisp_Object stream);
2663 DEFINE_LSTREAM_IMPLEMENTATION("encoding", lstream_encoding,
2664 sizeof(struct encoding_stream_s));
2667 encoding_marker(Lisp_Object stream)
2669 lstream_t str = ENCODING_STREAM_DATA(XLSTREAM(stream))->other_end;
2670 Lisp_Object str_obj;
2672 /* We do not need to mark the coding systems or charsets stored
2673 within the stream because they are stored in a global list
2674 and automatically marked. */
2676 XSETLSTREAM(str_obj, str);
2677 mark_object(str_obj);
2678 if (str->imp->marker) {
2679 return str->imp->marker(str_obj);
2685 /* Read SIZE bytes of data and store it into DATA. We are a encoding stream
2686 so we read data from the other end, encode it, and store it into DATA. */
2688 static Lstream_data_count
2689 encoding_reader(lstream_t stream, unsigned char *data, Lstream_data_count size)
2691 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2692 unsigned char *orig_data = data;
2693 Lstream_data_count read_size;
2694 int error_occurred = 0;
2696 /* We need to interface to mule_encode(), which expects to take some
2697 amount of data and store the result into a Dynarr. We have
2698 mule_encode() store into str->runoff, and take data from there
2701 /* We loop until we have enough data, reading chunks from the other
2702 end and encoding it. */
2704 /* Take data from the runoff if we can. Make sure to take at
2705 most SIZE bytes, and delete the data from the runoff. */
2706 if (Dynarr_length(str->runoff) > 0) {
2707 int chunk = min((int)size, Dynarr_length(str->runoff));
2708 memcpy(data, Dynarr_atp(str->runoff, 0), chunk);
2709 Dynarr_delete_many(str->runoff, 0, chunk);
2715 /* No more room for data */
2719 if (str->flags & CODING_STATE_END) {
2720 /* This means that on the previous iteration, we hit the
2721 EOF on the other end. We loop once more so that
2722 mule_encode() can output any final stuff it may be
2723 holding, or any "go back to a sane state" escape
2724 sequences. (This latter makes sense during
2729 /* Exhausted the runoff, so get some more. DATA at least SIZE
2730 bytes left of storage in it, so it's OK to read directly into
2731 it. (We'll be overwriting above, after we've encoded it into
2733 read_size = Lstream_read(str->other_end, data, size);
2734 if (read_size < 0) {
2738 if (read_size == 0) {
2739 /* There might be some more end data produced in the
2740 translation. See the comment above. */
2741 str->flags |= CODING_STATE_END;
2743 mule_encode(stream, data, str->runoff, read_size);
2746 if (data == orig_data) {
2747 return error_occurred ? -1 : 0;
2749 return data - orig_data;
2753 static Lstream_data_count
2754 encoding_writer(lstream_t stream, const unsigned char *data,
2755 Lstream_data_count size)
2757 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2758 Lstream_data_count retval;
2760 /* Encode all our data into the runoff, and then attempt to write
2761 it all out to the other end. Remove whatever chunk we succeeded
2763 mule_encode(stream, data, str->runoff, size);
2764 retval = Lstream_write(str->other_end, Dynarr_atp(str->runoff, 0),
2765 Dynarr_length(str->runoff));
2767 Dynarr_delete_many(str->runoff, 0, retval);
2769 /* Do NOT return retval. The return value indicates how much
2770 of the incoming data was written, not how many bytes were
2776 reset_encoding_stream(encoding_stream_t str)
2779 switch (CODING_SYSTEM_TYPE(str->codesys)) {
2780 case CODESYS_ISO2022: {
2783 for (i = 0; i < 4; i++) {
2784 str->iso2022.charset[i] =
2785 CODING_SYSTEM_ISO2022_INITIAL_CHARSET(
2787 str->iso2022.force_charset_on_output[i] =
2788 CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT(
2791 str->iso2022.register_left = 0;
2792 str->iso2022.register_right = 1;
2793 str->iso2022.current_charset = Qnil;
2794 str->iso2022.current_half = 0;
2795 str->iso2022.current_char_boundary = 1;
2799 setup_ccl_program(&str->ccl,
2800 CODING_SYSTEM_CCL_ENCODE(str->codesys));
2803 /* list the rest of them lot explicitly */
2804 case CODESYS_AUTODETECT:
2805 case CODESYS_SHIFT_JIS:
2809 case CODESYS_NO_CONVERSION:
2810 #ifdef DEBUG_SXEMACS
2811 case CODESYS_INTERNAL:
2818 str->flags = str->ch = 0;
2822 encoding_rewinder(lstream_t stream)
2824 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2825 reset_encoding_stream(str);
2826 Dynarr_reset(str->runoff);
2827 return Lstream_rewind(str->other_end);
2831 encoding_seekable_p(lstream_t stream)
2833 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2834 return Lstream_seekable_p(str->other_end);
2838 encoding_flusher(lstream_t stream)
2840 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2841 return Lstream_flush(str->other_end);
2845 encoding_closer(lstream_t stream)
2847 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2848 if (stream->flags & LSTREAM_FL_WRITE) {
2849 str->flags |= CODING_STATE_END;
2850 encoding_writer(stream, 0, 0);
2852 Dynarr_free(str->runoff);
2853 return Lstream_close(str->other_end);
2857 encoding_stream_coding_system(lstream_t stream)
2859 Lisp_Object coding_system;
2860 encoding_stream_t str = ENCODING_STREAM_DATA(stream);
2862 XSETCODING_SYSTEM(coding_system, str->codesys);
2863 return coding_system;
2867 set_encoding_stream_coding_system(lstream_t lstr, Lisp_Object codesys)
2869 Lisp_Coding_System *cs = XCODING_SYSTEM(codesys);
2870 encoding_stream_t str = ENCODING_STREAM_DATA(lstr);
2872 reset_encoding_stream(str);
2876 make_encoding_stream_1(lstream_t stream, Lisp_Object codesys, const char *mode)
2878 lstream_t lstr = Lstream_new(lstream_encoding, mode);
2879 encoding_stream_t str = ENCODING_STREAM_DATA(lstr);
2883 str->runoff = Dynarr_new(unsigned_char);
2884 str->other_end = stream;
2885 set_encoding_stream_coding_system(lstr, codesys);
2886 XSETLSTREAM(obj, lstr);
2891 make_encoding_input_stream(lstream_t stream, Lisp_Object codesys)
2893 return make_encoding_stream_1(stream, codesys, "r");
2897 make_encoding_output_stream(lstream_t stream, Lisp_Object codesys)
2899 return make_encoding_stream_1(stream, codesys, "w");
2902 /* Convert N bytes of internally-formatted data stored in SRC to an
2903 external format, according to the encoding stream ENCODING.
2904 Store the encoded data into DST. */
2907 mule_encode(lstream_t encoding, const Bufbyte * src,
2908 unsigned_char_dynarr * dst, Lstream_data_count n)
2910 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
2912 switch (CODING_SYSTEM_TYPE(str->codesys)) {
2913 #ifdef DEBUG_SXEMACS
2914 case CODESYS_INTERNAL:
2915 Dynarr_add_many(dst, src, n);
2918 case CODESYS_AUTODETECT:
2919 /* If we got this far and still haven't decided on the coding
2920 system, then do no conversion. */
2921 case CODESYS_NO_CONVERSION:
2922 encode_coding_no_conversion(encoding, src, dst, n);
2925 case CODESYS_SHIFT_JIS:
2926 encode_coding_sjis(encoding, src, dst, n);
2929 encode_coding_big5(encoding, src, dst, n);
2932 encode_coding_ucs4(encoding, src, dst, n);
2935 encode_coding_utf8(encoding, src, dst, n);
2938 str->ccl.last_block = str->flags & CODING_STATE_END;
2939 /* When applying ccl program to stream, MUST NOT set NULL
2941 ccl_driver(&str->ccl, ((src) ? src : (unsigned char *)""),
2942 dst, n, 0, CCL_MODE_ENCODING);
2944 case CODESYS_ISO2022:
2945 encode_coding_iso2022(encoding, src, dst, n);
2953 DEFUN("encode-coding-region", Fencode_coding_region, 3, 4, 0, /*
2954 Encode the text between START and END using CODING-SYSTEM.
2955 This will, for example, convert Japanese characters into stuff such as
2956 "^[$B!<!+^[(B" if you use the JIS encoding. Return length of encoded
2957 text. BUFFER defaults to the current buffer if unspecified.
2959 (start, end, coding_system, buffer))
2962 struct buffer *buf = decode_buffer(buffer, 0);
2963 Lisp_Object instream, lb_outstream, de_outstream, outstream;
2964 lstream_t istr, ostr;
2965 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
2967 get_buffer_range_char(buf, start, end, &b, &e, 0);
2969 barf_if_buffer_read_only(buf, b, e);
2971 coding_system = Fget_coding_system(coding_system);
2972 instream = make_lisp_buffer_input_stream(buf, b, e, 0);
2973 lb_outstream = make_lisp_buffer_output_stream(buf, b, 0);
2974 de_outstream = make_decoding_output_stream(XLSTREAM(lb_outstream),
2975 Fget_coding_system(Qbinary));
2976 outstream = make_encoding_output_stream(XLSTREAM(de_outstream),
2978 istr = XLSTREAM(instream);
2979 ostr = XLSTREAM(outstream);
2980 GCPRO4(instream, outstream, de_outstream, lb_outstream);
2981 /* The chain of streams looks like this:
2983 [BUFFER] <----- send through
2984 ------> [ENCODE AS SPECIFIED]
2985 ------> [DECODE AS BINARY]
2989 char tempbuf[1024]; /* some random amount */
2990 Bufpos newpos, even_newer_pos;
2991 Bufpos oldpos = lisp_buffer_stream_startpos(istr);
2992 Lstream_data_count size_in_bytes =
2993 Lstream_read(istr, tempbuf, sizeof(tempbuf));
2997 newpos = lisp_buffer_stream_startpos(istr);
2998 Lstream_write(ostr, tempbuf, size_in_bytes);
2999 even_newer_pos = lisp_buffer_stream_startpos(istr);
3000 buffer_delete_range(buf, even_newer_pos - (newpos - oldpos),
3006 lisp_buffer_stream_startpos(XLSTREAM(instream)) - b;
3007 Lstream_close(istr);
3008 Lstream_close(ostr);
3010 Lstream_delete(istr);
3011 Lstream_delete(ostr);
3012 Lstream_delete(XLSTREAM(de_outstream));
3013 Lstream_delete(XLSTREAM(lb_outstream));
3014 return make_int(retlen);
3020 /************************************************************************/
3021 /* Shift-JIS methods */
3022 /************************************************************************/
3024 /* Shift-JIS is a coding system encoding three character sets: ASCII, right
3025 half of JISX0201-Kana, and JISX0208. An ASCII character is encoded
3026 as is. A character of JISX0201-Kana (DIMENSION1_CHARS94 character set) is
3027 encoded by "position-code + 0x80". A character of JISX0208
3028 (DIMENSION2_CHARS94 character set) is encoded in 2-byte but two
3029 position-codes are divided and shifted so that it fit in the range
3032 --- CODE RANGE of Shift-JIS ---
3033 (character set) (range)
3035 JISX0201-Kana 0xA0 .. 0xDF
3036 JISX0208 (1st byte) 0x80 .. 0x9F and 0xE0 .. 0xEF
3037 (2nd byte) 0x40 .. 0x7E and 0x80 .. 0xFC
3038 -------------------------------
3042 /* Is this the first byte of a Shift-JIS two-byte char? */
3044 #define BYTE_SJIS_TWO_BYTE_1_P(c) \
3045 (((c) >= 0x81 && (c) <= 0x9F) || ((c) >= 0xE0 && (c) <= 0xEF))
3047 /* Is this the second byte of a Shift-JIS two-byte char? */
3049 #define BYTE_SJIS_TWO_BYTE_2_P(c) \
3050 (((c) >= 0x40 && (c) <= 0x7E) || ((c) >= 0x80 && (c) <= 0xFC))
3052 #define BYTE_SJIS_KATAKANA_P(c) \
3053 ((c) >= 0xA1 && (c) <= 0xDF)
3056 detect_coding_sjis(struct detection_state *st, const Extbyte * src,
3057 Lstream_data_count n)
3060 const unsigned char c = *(const unsigned char *)src++;
3061 if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
3063 if (st->shift_jis.in_second_byte) {
3064 st->shift_jis.in_second_byte = 0;
3067 } else if ((c >= 0x80 && c < 0xA0) || c >= 0xE0)
3068 st->shift_jis.in_second_byte = 1;
3070 return CODING_CATEGORY_SHIFT_JIS_MASK;
3073 /* Convert Shift-JIS data to internal format. */
3076 decode_coding_sjis(lstream_t decoding, const Extbyte * src,
3077 unsigned_char_dynarr * dst, Lstream_data_count n)
3079 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
3080 unsigned int flags = str->flags;
3081 unsigned int ch = str->ch;
3082 eol_type_t eol_type = str->eol_type;
3085 const unsigned char c = *(const unsigned char *)src++;
3088 /* Previous character was first byte of Shift-JIS Kanji
3090 if (BYTE_SJIS_TWO_BYTE_2_P(c)) {
3091 unsigned char e1, e2;
3093 Dynarr_add(dst, LEADING_BYTE_JAPANESE_JISX0208);
3094 DECODE_SJIS(ch, c, e1, e2);
3095 Dynarr_add(dst, e1);
3096 Dynarr_add(dst, e2);
3098 DECODE_ADD_BINARY_CHAR(ch, dst);
3099 DECODE_ADD_BINARY_CHAR(c, dst);
3103 DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst);
3104 if (BYTE_SJIS_TWO_BYTE_1_P(c))
3106 else if (BYTE_SJIS_KATAKANA_P(c)) {
3107 Dynarr_add(dst, LEADING_BYTE_KATAKANA_JISX0201);
3110 DECODE_ADD_BINARY_CHAR(c, dst);
3112 label_continue_loop:;
3115 DECODE_HANDLE_END_OF_CONVERSION(flags, ch, dst);
3121 /* Convert internally-formatted data to Shift-JIS. */
3124 encode_coding_sjis(lstream_t encoding, const Bufbyte * src,
3125 unsigned_char_dynarr * dst, Lstream_data_count n)
3127 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
3128 unsigned int flags = str->flags;
3129 unsigned int ch = str->ch;
3130 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE(str->codesys);
3135 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
3136 Dynarr_add(dst, '\r');
3137 if (eol_type != EOL_CR)
3138 Dynarr_add(dst, '\n');
3140 } else if (BYTE_ASCII_P(c)) {
3143 } else if (BUFBYTE_LEADING_BYTE_P(c))
3144 ch = (c == LEADING_BYTE_KATAKANA_JISX0201 ||
3145 c == LEADING_BYTE_JAPANESE_JISX0208_1978 ||
3146 c == LEADING_BYTE_JAPANESE_JISX0208) ? c : 0;
3148 if (ch == LEADING_BYTE_KATAKANA_JISX0201) {
3151 } else if (ch == LEADING_BYTE_JAPANESE_JISX0208_1978 ||
3152 ch == LEADING_BYTE_JAPANESE_JISX0208)
3155 /* j1 is bessel j1 function,
3156 * so we use something else */
3157 /* unsigned char j1, j2; */
3158 unsigned char tt1, tt2;
3160 ENCODE_SJIS(ch, c, tt1, tt2);
3161 Dynarr_add(dst, tt1);
3162 Dynarr_add(dst, tt2);
3172 DEFUN("decode-shift-jis-char", Fdecode_shift_jis_char, 1, 1, 0, /*
3173 Decode a JISX0208 character of Shift-JIS coding-system.
3174 CODE is the character code in Shift-JIS as a cons of type bytes.
3175 Return the corresponding character.
3179 unsigned char c1, c2, s1, s2;
3182 CHECK_INT(XCAR(code));
3183 CHECK_INT(XCDR(code));
3184 s1 = XINT(XCAR(code));
3185 s2 = XINT(XCDR(code));
3186 if (BYTE_SJIS_TWO_BYTE_1_P(s1) && BYTE_SJIS_TWO_BYTE_2_P(s2)) {
3187 DECODE_SJIS(s1, s2, c1, c2);
3188 return make_char(MAKE_CHAR(Vcharset_japanese_jisx0208,
3189 c1 & 0x7F, c2 & 0x7F));
3194 DEFUN("encode-shift-jis-char", Fencode_shift_jis_char, 1, 1, 0, /*
3195 Encode a JISX0208 character CHARACTER to SHIFT-JIS coding-system.
3196 Return the corresponding character code in SHIFT-JIS as a cons of two bytes.
3200 Lisp_Object charset;
3203 CHECK_CHAR_COERCE_INT(character);
3204 BREAKUP_CHAR(XCHAR(character), charset, c1, c2);
3205 if (EQ(charset, Vcharset_japanese_jisx0208)) {
3206 ENCODE_SJIS(c1 | 0x80, c2 | 0x80, s1, s2);
3207 return Fcons(make_int(s1), make_int(s2));
3212 /************************************************************************/
3214 /************************************************************************/
3216 /* BIG5 is a coding system encoding two character sets: ASCII and
3217 Big5. An ASCII character is encoded as is. Big5 is a two-byte
3218 character set and is encoded in two-byte.
3220 --- CODE RANGE of BIG5 ---
3221 (character set) (range)
3223 Big5 (1st byte) 0xA1 .. 0xFE
3224 (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE
3225 --------------------------
3227 Since the number of characters in Big5 is larger than maximum
3228 characters in Emacs' charset (96x96), it can't be handled as one
3229 charset. So, in Emacs, Big5 is divided into two: `charset-big5-1'
3230 and `charset-big5-2'. Both <type>s are DIMENSION2_CHARS94. The former
3231 contains frequently used characters and the latter contains less
3232 frequently used characters. */
3234 #define BYTE_BIG5_TWO_BYTE_1_P(c) \
3235 ((c) >= 0xA1 && (c) <= 0xFE)
3237 /* Is this the second byte of a Shift-JIS two-byte char? */
3239 #define BYTE_BIG5_TWO_BYTE_2_P(c) \
3240 (((c) >= 0x40 && (c) <= 0x7E) || ((c) >= 0xA1 && (c) <= 0xFE))
3242 /* Number of Big5 characters which have the same code in 1st byte. */
3244 #define BIG5_SAME_ROW (0xFF - 0xA1 + 0x7F - 0x40)
3246 /* Code conversion macros. These are macros because they are used in
3247 inner loops during code conversion.
3249 Note that temporary variables in macros introduce the classic
3250 dynamic-scoping problems with variable names. We use capital-
3251 lettered variables in the assumption that SXEmacs does not use
3252 capital letters in variables except in a very formalized way
3255 /* Convert Big5 code (b1, b2) into its internal string representation
3258 /* There is a much simpler way to split the Big5 charset into two.
3259 For the moment I'm going to leave the algorithm as-is because it
3260 claims to separate out the most-used characters into a single
3261 charset, which perhaps will lead to optimizations in various
3264 The way the algorithm works is something like this:
3266 Big5 can be viewed as a 94x157 charset, where the row is
3267 encoded into the bytes 0xA1 .. 0xFE and the column is encoded
3268 into the bytes 0x40 .. 0x7E and 0xA1 .. 0xFE. As for frequency,
3269 the split between low and high column numbers is apparently
3270 meaningless; ascending rows produce less and less frequent chars.
3271 Therefore, we assign the lower half of rows (0xA1 .. 0xC8) to
3272 the first charset, and the upper half (0xC9 .. 0xFE) to the
3273 second. To do the conversion, we convert the character into
3274 a single number where 0 .. 156 is the first row, 157 .. 313
3275 is the second, etc. That way, the characters are ordered by
3276 decreasing frequency. Then we just chop the space in two
3277 and coerce the result into a 94x94 space.
3280 #define DECODE_BIG5(b1, b2, lb, c1, c2) do \
3282 int B1 = b1, B2 = b2; \
3284 = (B1 - 0xA1) * BIG5_SAME_ROW + B2 - (B2 < 0x7F ? 0x40 : 0x62); \
3288 lb = LEADING_BYTE_CHINESE_BIG5_1; \
3292 lb = LEADING_BYTE_CHINESE_BIG5_2; \
3293 I -= (BIG5_SAME_ROW) * (0xC9 - 0xA1); \
3295 c1 = I / (0xFF - 0xA1) + 0xA1; \
3296 c2 = I % (0xFF - 0xA1) + 0xA1; \
3299 /* Convert the internal string representation of a Big5 character
3300 (lb, c1, c2) into Big5 code (b1, b2). */
3302 #define ENCODE_BIG5(lb, c1, c2, b1, b2) do \
3304 unsigned int I = ((c1) - 0xA1) * (0xFF - 0xA1) + ((c2) - 0xA1); \
3306 if (lb == LEADING_BYTE_CHINESE_BIG5_2) \
3308 I += BIG5_SAME_ROW * (0xC9 - 0xA1); \
3310 b1 = I / BIG5_SAME_ROW + 0xA1; \
3311 b2 = I % BIG5_SAME_ROW; \
3312 b2 += b2 < 0x3F ? 0x40 : 0x62; \
3316 detect_coding_big5(struct detection_state *st, const Extbyte * src,
3317 Lstream_data_count n)
3320 const unsigned char c = *(const unsigned char *)src++;
3321 if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO ||
3322 (c >= 0x80 && c <= 0xA0))
3324 if (st->big5.in_second_byte) {
3325 st->big5.in_second_byte = 0;
3326 if (c < 0x40 || (c >= 0x80 && c <= 0xA0))
3328 } else if (c >= 0xA1)
3329 st->big5.in_second_byte = 1;
3331 return CODING_CATEGORY_BIG5_MASK;
3334 /* Convert Big5 data to internal format. */
3337 decode_coding_big5(lstream_t decoding, const Extbyte * src,
3338 unsigned_char_dynarr * dst, Lstream_data_count n)
3340 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
3341 unsigned int flags = str->flags;
3342 unsigned int ch = str->ch;
3343 eol_type_t eol_type = str->eol_type;
3346 const unsigned char c = *(const unsigned char *)src++;
3348 /* Previous character was first byte of Big5 char. */
3349 if (BYTE_BIG5_TWO_BYTE_2_P(c)) {
3350 unsigned char b1, b2, b3;
3351 DECODE_BIG5(ch, c, b1, b2, b3);
3352 Dynarr_add(dst, b1);
3353 Dynarr_add(dst, b2);
3354 Dynarr_add(dst, b3);
3356 DECODE_ADD_BINARY_CHAR(ch, dst);
3357 DECODE_ADD_BINARY_CHAR(c, dst);
3361 DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst);
3362 if (BYTE_BIG5_TWO_BYTE_1_P(c))
3365 DECODE_ADD_BINARY_CHAR(c, dst);
3367 label_continue_loop:;
3370 DECODE_HANDLE_END_OF_CONVERSION(flags, ch, dst);
3376 /* Convert internally-formatted data to Big5. */
3379 encode_coding_big5(lstream_t encoding, const Bufbyte * src,
3380 unsigned_char_dynarr * dst, Lstream_data_count n)
3383 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
3384 unsigned int flags = str->flags;
3385 unsigned int ch = str->ch;
3386 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE(str->codesys);
3391 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
3392 Dynarr_add(dst, '\r');
3393 if (eol_type != EOL_CR)
3394 Dynarr_add(dst, '\n');
3395 } else if (BYTE_ASCII_P(c)) {
3398 } else if (BUFBYTE_LEADING_BYTE_P(c)) {
3399 if (c == LEADING_BYTE_CHINESE_BIG5_1 ||
3400 c == LEADING_BYTE_CHINESE_BIG5_2) {
3401 /* A recognized leading byte. */
3403 continue; /* not done with this character. */
3405 /* otherwise just ignore this character. */
3406 } else if (ch == LEADING_BYTE_CHINESE_BIG5_1 ||
3407 ch == LEADING_BYTE_CHINESE_BIG5_2) {
3408 /* Previous char was a recognized leading byte. */
3410 continue; /* not done with this character. */
3412 /* Encountering second byte of a Big5 character. */
3413 unsigned char b1, b2;
3415 ENCODE_BIG5(ch >> 8, ch & 0xFF, c, b1, b2);
3416 Dynarr_add(dst, b1);
3417 Dynarr_add(dst, b2);
3427 DEFUN("decode-big5-char", Fdecode_big5_char, 1, 1, 0, /*
3428 Decode a Big5 character CODE of BIG5 coding-system.
3429 CODE is the character code in BIG5, a cons of two integers.
3430 Return the corresponding character.
3434 unsigned char c1, c2, b1, b2;
3437 CHECK_INT(XCAR(code));
3438 CHECK_INT(XCDR(code));
3439 b1 = XINT(XCAR(code));
3440 b2 = XINT(XCDR(code));
3441 if (BYTE_BIG5_TWO_BYTE_1_P(b1) && BYTE_BIG5_TWO_BYTE_2_P(b2)) {
3443 Lisp_Object charset;
3444 DECODE_BIG5(b1, b2, leading_byte, c1, c2);
3445 charset = CHARSET_BY_LEADING_BYTE(leading_byte);
3446 return make_char(MAKE_CHAR(charset, c1 & 0x7F, c2 & 0x7F));
3451 DEFUN("encode-big5-char", Fencode_big5_char, 1, 1, 0, /*
3452 Encode the Big5 character CHARACTER in the BIG5 coding-system.
3453 Return the corresponding character code in Big5.
3457 Lisp_Object charset;
3460 CHECK_CHAR_COERCE_INT(character);
3461 BREAKUP_CHAR(XCHAR(character), charset, c1, c2);
3462 if (EQ(charset, Vcharset_chinese_big5_1) ||
3463 EQ(charset, Vcharset_chinese_big5_2)) {
3464 ENCODE_BIG5(XCHARSET_LEADING_BYTE(charset), c1 | 0x80,
3466 return Fcons(make_int(b1), make_int(b2));
3471 /************************************************************************/
3474 /* UCS-4 character codes are implemented as nonnegative integers. */
3476 /************************************************************************/
3478 DEFUN("set-ucs-char", Fset_ucs_char, 2, 2, 0, /*
3479 Map UCS-4 code CODE to Mule character CHARACTER.
3481 Return T on success, NIL on failure.
3487 CHECK_CHAR(character);
3491 if (c < countof(fcd->ucs_to_mule_table)) {
3492 fcd->ucs_to_mule_table[c] = character;
3498 static Lisp_Object ucs_to_char(unsigned long code)
3500 if (code < countof(fcd->ucs_to_mule_table)) {
3501 return fcd->ucs_to_mule_table[code];
3502 } else if ((0xe00000 <= code) && (code <= 0xe00000 + 94 * 94 * 14)) {
3506 c = code % (94 * 94);
3508 (MAKE_CHAR(CHARSET_BY_ATTRIBUTES
3509 (CHARSET_TYPE_94X94, code / (94 * 94) + '@',
3510 CHARSET_LEFT_TO_RIGHT),
3511 c / 94 + 33, c % 94 + 33));
3516 DEFUN("ucs-char", Fucs_char, 1, 1, 0, /*
3517 Return Mule character corresponding to UCS code CODE (a positive integer).
3522 return ucs_to_char(XINT(code));
3525 DEFUN("set-char-ucs", Fset_char_ucs, 2, 2, 0, /*
3526 Map Mule character CHARACTER to UCS code CODE (a positive integer).
3530 /* #### Isn't this gilding the lily? Fput_char_table checks its args.
3531 Fset_char_ucs is more restrictive on index arg, but should
3532 check code arg in a char_table method. */
3533 CHECK_CHAR(character);
3535 return Fput_char_table(character, code, mule_to_ucs_table);
3538 DEFUN("char-ucs", Fchar_ucs, 1, 1, 0, /*
3539 Return the UCS code (a positive integer) corresponding to CHARACTER.
3543 return Fget_char_table(character, mule_to_ucs_table);
3546 /* Decode a UCS-4 character into a buffer. If the lookup fails, use
3547 <GETA MARK> (U+3013) of JIS X 0208, which means correct character
3548 is not found, instead.
3549 #### do something more appropriate (use blob?)
3550 Danger, Will Robinson! Data loss. Should we signal user? */
3551 static void decode_ucs4(unsigned long ch, unsigned_char_dynarr * dst)
3553 Lisp_Object chr = ucs_to_char(ch);
3556 Bufbyte work[MAX_EMCHAR_LEN];
3561 simple_set_charptr_emchar(work, ch) :
3562 non_ascii_set_charptr_emchar(work, ch);
3563 Dynarr_add_many(dst, work, len);
3565 Dynarr_add(dst, LEADING_BYTE_JAPANESE_JISX0208);
3566 Dynarr_add(dst, 34 + 128);
3567 Dynarr_add(dst, 46 + 128);
3571 static unsigned long
3572 mule_char_to_ucs4(Lisp_Object charset, unsigned char h, unsigned char l)
3575 = Fget_char_table(make_char(MAKE_CHAR(charset, h & 127, l & 127)),
3580 } else if ((XCHARSET_DIMENSION(charset) == 2) &&
3581 (XCHARSET_CHARS(charset) == 94)) {
3582 unsigned char final = XCHARSET_FINAL(charset);
3584 if (('@' <= final) && (final < 0x7f)) {
3585 return 0xe00000 + (final - '@') * 94 * 94
3586 + ((h & 127) - 33) * 94 + (l & 127) - 33;
3596 encode_ucs4(Lisp_Object charset,
3597 unsigned char h, unsigned char l, unsigned_char_dynarr * dst)
3599 unsigned long code = mule_char_to_ucs4(charset, h, l);
3600 Dynarr_add(dst, code >> 24);
3601 Dynarr_add(dst, (code >> 16) & 255);
3602 Dynarr_add(dst, (code >> 8) & 255);
3603 Dynarr_add(dst, code & 255);
3607 detect_coding_ucs4(struct detection_state *st, const Extbyte * src,
3608 Lstream_data_count n)
3611 const unsigned char c = *(const unsigned char *)src++;
3612 switch (st->ucs4.in_byte) {
3620 st->ucs4.in_byte = 0;
3626 return CODING_CATEGORY_UCS4_MASK;
3630 decode_coding_ucs4(lstream_t decoding, const Extbyte * src,
3631 unsigned_char_dynarr * dst, Lstream_data_count n)
3633 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
3634 unsigned int flags = str->flags;
3635 unsigned int ch = str->ch;
3636 unsigned char counter = str->counter;
3639 const unsigned char c = *(const unsigned char *)src++;
3646 decode_ucs4((ch << 8) | c, dst);
3655 if (counter & CODING_STATE_END)
3656 DECODE_OUTPUT_PARTIAL_CHAR(ch);
3660 str->counter = counter;
3664 encode_coding_ucs4(lstream_t encoding, const Bufbyte * src,
3665 unsigned_char_dynarr * dst, Lstream_data_count n)
3667 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
3668 unsigned int flags = str->flags;
3669 unsigned int ch = str->ch;
3670 unsigned char char_boundary = str->iso2022.current_char_boundary;
3671 Lisp_Object charset = str->iso2022.current_charset;
3673 #ifdef ENABLE_COMPOSITE_CHARS
3674 /* flags for handling composite chars. We do a little switcharoo
3675 on the source while we're outputting the composite char. */
3676 unsigned int saved_n = 0;
3677 const unsigned char *saved_src = NULL;
3678 int in_composite = 0;
3684 unsigned char c = *src++;
3686 if (BYTE_ASCII_P(c)) { /* Processing ASCII character */
3688 encode_ucs4(Vcharset_ascii, c, 0, dst);
3690 } else if (BUFBYTE_LEADING_BYTE_P(c) || BUFBYTE_LEADING_BYTE_P(ch)) { /* Processing Leading Byte */
3692 charset = CHARSET_BY_LEADING_BYTE(c);
3693 if (LEADING_BYTE_PREFIX_P(c))
3696 } else { /* Processing Non-ASCII character */
3698 if (EQ(charset, Vcharset_control_1)) {
3699 encode_ucs4(Vcharset_control_1, c, 0, dst);
3701 switch (XCHARSET_REP_BYTES(charset)) {
3703 encode_ucs4(charset, c, 0, dst);
3706 if (XCHARSET_PRIVATE_P(charset)) {
3707 encode_ucs4(charset, c, 0, dst);
3710 #ifdef ENABLE_COMPOSITE_CHARS
3713 Vcharset_composite)) {
3715 /* #### Bother! We don't know how to
3728 (Vcharset_composite,
3733 composite_char_string
3742 n = XSTRING_LENGTH(lstr);
3745 #endif /* ENABLE_COMPOSITE_CHARS */
3747 encode_ucs4(charset, ch,
3758 encode_ucs4(charset, ch, c,
3773 #ifdef ENABLE_COMPOSITE_CHARS
3778 goto back_to_square_n; /* Wheeeeeeeee ..... */
3780 #endif /* ENABLE_COMPOSITE_CHARS */
3784 str->iso2022.current_char_boundary = char_boundary;
3785 str->iso2022.current_charset = charset;
3787 /* Verbum caro factum est! */
3790 /************************************************************************/
3792 /************************************************************************/
3795 detect_coding_utf8(struct detection_state *st, const Extbyte * src,
3796 Lstream_data_count n)
3799 const unsigned char c = *(const unsigned char *)src++;
3800 switch (st->utf8.in_byte) {
3802 if (c == ISO_CODE_ESC || c == ISO_CODE_SI
3803 || c == ISO_CODE_SO)
3806 st->utf8.in_byte = 5;
3808 st->utf8.in_byte = 4;
3810 st->utf8.in_byte = 3;
3812 st->utf8.in_byte = 2;
3814 st->utf8.in_byte = 1;
3819 if ((c & 0xc0) != 0x80)
3825 return CODING_CATEGORY_UTF8_MASK;
3829 decode_coding_utf8(lstream_t decoding, const Extbyte * src,
3830 unsigned_char_dynarr * dst, Lstream_data_count n)
3832 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
3833 unsigned int flags = str->flags;
3834 unsigned int ch = str->ch;
3835 eol_type_t eol_type = str->eol_type;
3836 unsigned char counter = str->counter;
3839 const unsigned char c = *(const unsigned char *)src++;
3845 } else if (c >= 0xf8) {
3848 } else if (c >= 0xf0) {
3851 } else if (c >= 0xe0) {
3854 } else if (c >= 0xc0) {
3858 DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst);
3859 decode_ucs4(c, dst);
3863 ch = (ch << 6) | (c & 0x3f);
3864 decode_ucs4(ch, dst);
3869 ch = (ch << 6) | (c & 0x3f);
3872 label_continue_loop:;
3875 if (flags & CODING_STATE_END)
3876 DECODE_OUTPUT_PARTIAL_CHAR(ch);
3880 str->counter = counter;
3884 encode_utf8(Lisp_Object charset,
3885 unsigned char h, unsigned char l, unsigned_char_dynarr * dst)
3887 unsigned long code = mule_char_to_ucs4(charset, h, l);
3889 Dynarr_add(dst, code);
3890 } else if (code <= 0x7ff) {
3891 Dynarr_add(dst, (code >> 6) | 0xc0);
3892 Dynarr_add(dst, (code & 0x3f) | 0x80);
3893 } else if (code <= 0xffff) {
3894 Dynarr_add(dst, (code >> 12) | 0xe0);
3895 Dynarr_add(dst, ((code >> 6) & 0x3f) | 0x80);
3896 Dynarr_add(dst, (code & 0x3f) | 0x80);
3897 } else if (code <= 0x1fffff) {
3898 Dynarr_add(dst, (code >> 18) | 0xf0);
3899 Dynarr_add(dst, ((code >> 12) & 0x3f) | 0x80);
3900 Dynarr_add(dst, ((code >> 6) & 0x3f) | 0x80);
3901 Dynarr_add(dst, (code & 0x3f) | 0x80);
3902 } else if (code <= 0x3ffffff) {
3903 Dynarr_add(dst, (code >> 24) | 0xf8);
3904 Dynarr_add(dst, ((code >> 18) & 0x3f) | 0x80);
3905 Dynarr_add(dst, ((code >> 12) & 0x3f) | 0x80);
3906 Dynarr_add(dst, ((code >> 6) & 0x3f) | 0x80);
3907 Dynarr_add(dst, (code & 0x3f) | 0x80);
3909 Dynarr_add(dst, (code >> 30) | 0xfc);
3910 Dynarr_add(dst, ((code >> 24) & 0x3f) | 0x80);
3911 Dynarr_add(dst, ((code >> 18) & 0x3f) | 0x80);
3912 Dynarr_add(dst, ((code >> 12) & 0x3f) | 0x80);
3913 Dynarr_add(dst, ((code >> 6) & 0x3f) | 0x80);
3914 Dynarr_add(dst, (code & 0x3f) | 0x80);
3919 encode_coding_utf8(lstream_t encoding, const Bufbyte * src,
3920 unsigned_char_dynarr * dst, Lstream_data_count n)
3922 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
3923 unsigned int flags = str->flags;
3924 unsigned int ch = str->ch;
3925 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE(str->codesys);
3926 unsigned char char_boundary = str->iso2022.current_char_boundary;
3927 Lisp_Object charset = str->iso2022.current_charset;
3929 #ifdef ENABLE_COMPOSITE_CHARS
3930 /* flags for handling composite chars. We do a little switcharoo
3931 on the source while we're outputting the composite char. */
3932 unsigned int saved_n = 0;
3933 const unsigned char *saved_src = NULL;
3934 int in_composite = 0;
3937 #endif /* ENABLE_COMPOSITE_CHARS */
3940 unsigned char c = *src++;
3942 if (BYTE_ASCII_P(c)) { /* Processing ASCII character */
3945 if (eol_type != EOL_LF
3946 && eol_type != EOL_AUTODETECT)
3947 Dynarr_add(dst, '\r');
3948 if (eol_type != EOL_CR)
3951 encode_utf8(Vcharset_ascii, c, 0, dst);
3953 } else if (BUFBYTE_LEADING_BYTE_P(c) || BUFBYTE_LEADING_BYTE_P(ch)) { /* Processing Leading Byte */
3955 charset = CHARSET_BY_LEADING_BYTE(c);
3956 if (LEADING_BYTE_PREFIX_P(c))
3959 } else { /* Processing Non-ASCII character */
3961 if (EQ(charset, Vcharset_control_1)) {
3962 encode_utf8(Vcharset_control_1, c, 0, dst);
3964 switch (XCHARSET_REP_BYTES(charset)) {
3966 encode_utf8(charset, c, 0, dst);
3969 if (XCHARSET_PRIVATE_P(charset)) {
3970 encode_utf8(charset, c, 0, dst);
3973 #ifdef ENABLE_COMPOSITE_CHARS
3976 Vcharset_composite)) {
3978 /* #### Bother! We don't know how to
3987 (Vcharset_composite,
3992 composite_char_string
4001 n = XSTRING_LENGTH(lstr);
4004 #endif /* ENABLE_COMPOSITE_CHARS */
4006 encode_utf8(charset, ch,
4017 encode_utf8(charset, ch, c,
4032 #ifdef ENABLE_COMPOSITE_CHARS
4037 goto back_to_square_n; /* Wheeeeeeeee ..... */
4043 str->iso2022.current_char_boundary = char_boundary;
4044 str->iso2022.current_charset = charset;
4046 /* Verbum caro factum est! */
4049 /************************************************************************/
4050 /* ISO2022 methods */
4051 /************************************************************************/
4053 /* The following note describes the coding system ISO2022 briefly.
4054 Since the intention of this note is to help understand the
4055 functions in this file, some parts are NOT ACCURATE or OVERLY
4056 SIMPLIFIED. For thorough understanding, please refer to the
4057 original document of ISO2022.
4059 ISO2022 provides many mechanisms to encode several character sets
4060 in 7-bit and 8-bit environments. For 7-bit environments, all text
4061 is encoded using bytes less than 128. This may make the encoded
4062 text a little bit longer, but the text passes more easily through
4063 several gateways, some of which strip off MSB (Most Signigant Bit).
4065 There are two kinds of character sets: control character set and
4066 graphic character set. The former contains control characters such
4067 as `newline' and `escape' to provide control functions (control
4068 functions are also provided by escape sequences). The latter
4069 contains graphic characters such as 'A' and '-'. Emacs recognizes
4070 two control character sets and many graphic character sets.
4072 Graphic character sets are classified into one of the following
4073 four classes, according to the number of bytes (DIMENSION) and
4074 number of characters in one dimension (CHARS) of the set:
4075 - DIMENSION1_CHARS94
4076 - DIMENSION1_CHARS96
4077 - DIMENSION2_CHARS94
4078 - DIMENSION2_CHARS96
4080 In addition, each character set is assigned an identification tag,
4081 unique for each set, called "final character" (denoted as <F>
4082 hereafter). The <F> of each character set is decided by ECMA(*)
4083 when it is registered in ISO. The code range of <F> is 0x30..0x7F
4084 (0x30..0x3F are for private use only).
4086 Note (*): ECMA = European Computer Manufacturers Association
4088 Here are examples of graphic character set [NAME(<F>)]:
4089 o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ...
4090 o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ...
4091 o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ...
4092 o DIMENSION2_CHARS96 -- none for the moment
4094 A code area (1 byte = 8 bits) is divided into 4 areas, C0, GL, C1, and GR.
4095 C0 [0x00..0x1F] -- control character plane 0
4096 GL [0x20..0x7F] -- graphic character plane 0
4097 C1 [0x80..0x9F] -- control character plane 1
4098 GR [0xA0..0xFF] -- graphic character plane 1
4100 A control character set is directly designated and invoked to C0 or
4101 C1 by an escape sequence. The most common case is that:
4102 - ISO646's control character set is designated/invoked to C0, and
4103 - ISO6429's control character set is designated/invoked to C1,
4104 and usually these designations/invocations are omitted in encoded
4105 text. In a 7-bit environment, only C0 can be used, and a control
4106 character for C1 is encoded by an appropriate escape sequence to
4107 fit into the environment. All control characters for C1 are
4108 defined to have corresponding escape sequences.
4110 A graphic character set is at first designated to one of four
4111 graphic registers (G0 through G3), then these graphic registers are
4112 invoked to GL or GR. These designations and invocations can be
4113 done independently. The most common case is that G0 is invoked to
4114 GL, G1 is invoked to GR, and ASCII is designated to G0. Usually
4115 these invocations and designations are omitted in encoded text.
4116 In a 7-bit environment, only GL can be used.
4118 When a graphic character set of CHARS94 is invoked to GL, codes
4119 0x20 and 0x7F of the GL area work as control characters SPACE and
4120 DEL respectively, and codes 0xA0 and 0xFF of the GR area should not
4123 There are two ways of invocation: locking-shift and single-shift.
4124 With locking-shift, the invocation lasts until the next different
4125 invocation, whereas with single-shift, the invocation affects the
4126 following character only and doesn't affect the locking-shift
4127 state. Invocations are done by the following control characters or
4130 ----------------------------------------------------------------------
4131 abbrev function cntrl escape seq description
4132 ----------------------------------------------------------------------
4133 SI/LS0 (shift-in) 0x0F none invoke G0 into GL
4134 SO/LS1 (shift-out) 0x0E none invoke G1 into GL
4135 LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL
4136 LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL
4137 LS1R (locking-shift-1 right) none ESC '~' invoke G1 into GR (*)
4138 LS2R (locking-shift-2 right) none ESC '}' invoke G2 into GR (*)
4139 LS3R (locking-shift 3 right) none ESC '|' invoke G3 into GR (*)
4140 SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 for one char
4141 SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 for one char
4142 ----------------------------------------------------------------------
4143 (*) These are not used by any known coding system.
4145 Control characters for these functions are defined by macros
4146 ISO_CODE_XXX in `coding.h'.
4148 Designations are done by the following escape sequences:
4149 ----------------------------------------------------------------------
4150 escape sequence description
4151 ----------------------------------------------------------------------
4152 ESC '(' <F> designate DIMENSION1_CHARS94<F> to G0
4153 ESC ')' <F> designate DIMENSION1_CHARS94<F> to G1
4154 ESC '*' <F> designate DIMENSION1_CHARS94<F> to G2
4155 ESC '+' <F> designate DIMENSION1_CHARS94<F> to G3
4156 ESC ',' <F> designate DIMENSION1_CHARS96<F> to G0 (*)
4157 ESC '-' <F> designate DIMENSION1_CHARS96<F> to G1
4158 ESC '.' <F> designate DIMENSION1_CHARS96<F> to G2
4159 ESC '/' <F> designate DIMENSION1_CHARS96<F> to G3
4160 ESC '$' '(' <F> designate DIMENSION2_CHARS94<F> to G0 (**)
4161 ESC '$' ')' <F> designate DIMENSION2_CHARS94<F> to G1
4162 ESC '$' '*' <F> designate DIMENSION2_CHARS94<F> to G2
4163 ESC '$' '+' <F> designate DIMENSION2_CHARS94<F> to G3
4164 ESC '$' ',' <F> designate DIMENSION2_CHARS96<F> to G0 (*)
4165 ESC '$' '-' <F> designate DIMENSION2_CHARS96<F> to G1
4166 ESC '$' '.' <F> designate DIMENSION2_CHARS96<F> to G2
4167 ESC '$' '/' <F> designate DIMENSION2_CHARS96<F> to G3
4168 ----------------------------------------------------------------------
4170 In this list, "DIMENSION1_CHARS94<F>" means a graphic character set
4171 of dimension 1, chars 94, and final character <F>, etc...
4173 Note (*): Although these designations are not allowed in ISO2022,
4174 Emacs accepts them on decoding, and produces them on encoding
4175 CHARS96 character sets in a coding system which is characterized as
4176 7-bit environment, non-locking-shift, and non-single-shift.
4178 Note (**): If <F> is '@', 'A', or 'B', the intermediate character
4179 '(' can be omitted. We refer to this as "short-form" hereafter.
4181 Now you may notice that there are a lot of ways for encoding the
4182 same multilingual text in ISO2022. Actually, there exist many
4183 coding systems such as Compound Text (used in X11's inter client
4184 communication, ISO-2022-JP (used in Japanese internet), ISO-2022-KR
4185 (used in Korean internet), EUC (Extended UNIX Code, used in Asian
4186 localized platforms), and all of these are variants of ISO2022.
4188 In addition to the above, Emacs handles two more kinds of escape
4189 sequences: ISO6429's direction specification and Emacs' private
4190 sequence for specifying character composition.
4192 ISO6429's direction specification takes the following form:
4193 o CSI ']' -- end of the current direction
4194 o CSI '0' ']' -- end of the current direction
4195 o CSI '1' ']' -- start of left-to-right text
4196 o CSI '2' ']' -- start of right-to-left text
4197 The control character CSI (0x9B: control sequence introducer) is
4198 abbreviated to the escape sequence ESC '[' in a 7-bit environment.
4200 Character composition specification takes the following form:
4201 o ESC '0' -- start character composition
4202 o ESC '1' -- end character composition
4203 Since these are not standard escape sequences of any ISO standard,
4204 their use with these meanings is restricted to Emacs only. */
4207 reset_iso2022(Lisp_Object coding_system, struct iso2022_decoder *iso)
4211 for (i = 0; i < 4; i++) {
4212 if (!NILP(coding_system))
4214 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET
4217 iso->charset[i] = Qt;
4218 iso->invalid_designated[i] = 0;
4220 iso->esc = ISO_ESC_NOTHING;
4221 iso->esc_bytes_index = 0;
4222 iso->register_left = 0;
4223 iso->register_right = 1;
4224 iso->switched_dir_and_no_valid_charset_yet = 0;
4225 iso->invalid_switch_dir = 0;
4226 iso->output_direction_sequence = 0;
4227 iso->output_literally = 0;
4228 #ifdef ENABLE_COMPOSITE_CHARS
4229 if (iso->composite_chars)
4230 Dynarr_reset(iso->composite_chars);
4234 static int fit_to_be_escape_quoted(unsigned char c)
4250 /* Parse one byte of an ISO2022 escape sequence.
4251 If the result is an invalid escape sequence, return 0 and
4252 do not change anything in STR. Otherwise, if the result is
4253 an incomplete escape sequence, update ISO2022.ESC and
4254 ISO2022.ESC_BYTES and return -1. Otherwise, update
4255 all the state variables (but not ISO2022.ESC_BYTES) and
4258 If CHECK_INVALID_CHARSETS is non-zero, check for designation
4259 or invocation of an invalid character set and treat that as
4260 an unrecognized escape sequence.
4262 ********************************************************************
4264 #### Strategies for error annotation and coding orthogonalization
4266 We really want to separate out a number of things. Conceptually,
4267 there is a nested syntax.
4269 At the top level is the ISO 2022 extension syntax, including charset
4270 designation and invocation, and certain auxiliary controls such as the
4271 ISO 6429 direction specification. These are octet-oriented, with the
4272 single exception (AFAIK) of the "exit Unicode" sequence which uses the
4273 UTF's natural width (1 byte for UTF-7 and UTF-8, 2 bytes for UCS-2 and
4274 UTF-16, and 4 bytes for UCS-4 and UTF-32). This will be treated as a
4275 (deprecated) special case in Unicode processing.
4277 The middle layer is ISO 2022 character interpretation. This will depend
4278 on the current state of the ISO 2022 registers, and assembles octets
4279 into the character's internal representation.
4281 The lowest level is translating system control conventions. At present
4282 this is restricted to newline translation, but one could imagine doing
4283 tab conversion or line wrapping here. "Escape from Unicode" processing
4284 would be done at this level.
4286 At each level the parser will verify the syntax. In the case of a
4287 syntax error or warning (such as a redundant escape sequence that affects
4288 no characters), the parser will take some action, typically inserting the
4289 erroneous octets directly into the output and creating an annotation
4290 which can be used by higher level I/O to mark the affected region.
4292 This should make it possible to do something sensible about separating
4293 newline convention processing from character construction, and about
4294 preventing ISO 2022 escape sequences from being recognized
4297 The basic strategy will be to have octet classification tables, and
4298 switch processing according to the table entry.
4300 It's possible that, by doing the processing with tables of functions or
4301 the like, the parser can be used for both detection and translation. */
4304 parse_iso2022_esc(Lisp_Object codesys, struct iso2022_decoder *iso,
4305 unsigned char c, unsigned int *flags,
4306 int check_invalid_charsets)
4308 /* (1) If we're at the end of a designation sequence, CS is the
4309 charset being designated and REG is the register to designate
4312 (2) If we're at the end of a locking-shift sequence, REG is
4313 the register to invoke and HALF (0 == left, 1 == right) is
4314 the half to invoke it into.
4316 (3) If we're at the end of a single-shift sequence, REG is
4317 the register to invoke. */
4318 Lisp_Object cs = Qnil;
4321 /* NOTE: This code does goto's all over the fucking place.
4322 The reason for this is that we're basically implementing
4323 a state machine here, and hierarchical languages like C
4324 don't really provide a clean way of doing this. */
4326 if (!(*flags & CODING_STATE_ESCAPE))
4327 /* At beginning of escape sequence; we need to reset our
4328 escape-state variables. */
4329 iso->esc = ISO_ESC_NOTHING;
4331 iso->output_literally = 0;
4332 iso->output_direction_sequence = 0;
4335 case ISO_ESC_NOTHING:
4336 iso->esc_bytes_index = 0;
4338 case ISO_CODE_ESC: /* Start escape sequence */
4339 *flags |= CODING_STATE_ESCAPE;
4343 case ISO_CODE_CSI: /* ISO6429 (specifying directionality) */
4344 *flags |= CODING_STATE_ESCAPE;
4345 iso->esc = ISO_ESC_5_11;
4348 case ISO_CODE_SO: /* locking shift 1 */
4352 case ISO_CODE_SI: /* locking shift 0 */
4357 case ISO_CODE_SS2: /* single shift */
4360 case ISO_CODE_SS3: /* single shift */
4364 default: /* Other control characters */
4370 /**** single shift ****/
4372 case 'N': /* single shift 2 */
4375 case 'O': /* single shift 3 */
4379 /**** locking shift ****/
4381 case '~': /* locking shift 1 right */
4385 case 'n': /* locking shift 2 */
4389 case '}': /* locking shift 2 right */
4393 case 'o': /* locking shift 3 */
4397 case '|': /* locking shift 3 right */
4402 #ifdef ENABLE_COMPOSITE_CHARS
4403 /**** composite ****/
4406 iso->esc = ISO_ESC_START_COMPOSITE;
4407 *flags = (*flags & CODING_STATE_ISO2022_LOCK) |
4408 CODING_STATE_COMPOSITE;
4412 iso->esc = ISO_ESC_END_COMPOSITE;
4413 *flags = (*flags & CODING_STATE_ISO2022_LOCK) &
4414 ~CODING_STATE_COMPOSITE;
4416 #endif /* ENABLE_COMPOSITE_CHARS */
4418 /**** directionality ****/
4421 iso->esc = ISO_ESC_5_11;
4424 /**** designation ****/
4426 case '$': /* multibyte charset prefix */
4427 iso->esc = ISO_ESC_2_4;
4431 if (0x28 <= c && c <= 0x2F) {
4433 (enum iso_esc_flag)(c - 0x28 + ISO_ESC_2_8);
4437 /* This function is called with CODESYS equal to nil when
4438 doing coding-system detection. */
4440 && XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys)
4441 && fit_to_be_escape_quoted(c)) {
4442 iso->esc = ISO_ESC_LITERAL;
4443 *flags &= CODING_STATE_ISO2022_LOCK;
4451 /**** directionality ****/
4453 case ISO_ESC_5_11: /* ISO6429 direction control */
4456 (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L);
4457 goto directionality;
4460 iso->esc = ISO_ESC_5_11_0;
4462 iso->esc = ISO_ESC_5_11_1;
4464 iso->esc = ISO_ESC_5_11_2;
4469 case ISO_ESC_5_11_0:
4472 (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L);
4473 goto directionality;
4477 case ISO_ESC_5_11_1:
4480 (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L);
4481 goto directionality;
4485 case ISO_ESC_5_11_2:
4488 (*flags & CODING_STATE_ISO2022_LOCK) |
4490 goto directionality;
4495 iso->esc = ISO_ESC_DIRECTIONALITY;
4496 /* Various junk here to attempt to preserve the direction
4497 sequences literally in the text if they would otherwise be
4498 swallowed due to invalid designations that don't show up as
4499 actual charset changes in the text. */
4500 if (iso->invalid_switch_dir) {
4501 /* We already inserted a direction switch literally into
4502 the text. We assume (#### this may not be right)
4503 that the next direction switch is the one going the
4504 other way, and we need to output that literally as
4506 iso->output_literally = 1;
4507 iso->invalid_switch_dir = 0;
4511 /* If we are in the thrall of an invalid designation,
4512 then stick the directionality sequence literally into
4513 the output stream so it ends up in the original text
4515 for (jj = 0; jj < 4; jj++)
4516 if (iso->invalid_designated[jj])
4519 iso->output_literally = 1;
4520 iso->invalid_switch_dir = 1;
4522 /* Indicate that we haven't yet seen a valid
4523 designation, so that if a switch-dir is
4524 directly followed by an invalid designation,
4525 both get inserted literally. */
4526 iso->switched_dir_and_no_valid_charset_yet = 1;
4530 /**** designation ****/
4533 if (0x28 <= c && c <= 0x2F) {
4535 (enum iso_esc_flag)(c - 0x28 + ISO_ESC_2_4_8);
4538 if (0x40 <= c && c <= 0x42) {
4539 cs = CHARSET_BY_ATTRIBUTES(CHARSET_TYPE_94X94, c,
4540 *flags & CODING_STATE_R2L ?
4541 CHARSET_RIGHT_TO_LEFT :
4542 CHARSET_LEFT_TO_RIGHT);
4559 case ISO_ESC_2_4_10:
4560 case ISO_ESC_2_4_11:
4561 case ISO_ESC_2_4_12:
4562 case ISO_ESC_2_4_13:
4563 case ISO_ESC_2_4_14:
4564 case ISO_ESC_2_4_15:
4565 case ISO_ESC_SINGLE_SHIFT:
4566 case ISO_ESC_LOCKING_SHIFT:
4567 case ISO_ESC_DESIGNATE:
4568 case ISO_ESC_DIRECTIONALITY:
4569 case ISO_ESC_LITERAL:
4574 if (c < '0' || c > '~')
4575 return 0; /* bad final byte */
4577 if (iso->esc >= ISO_ESC_2_8 && iso->esc <= ISO_ESC_2_15) {
4578 type = ((iso->esc >= ISO_ESC_2_12) ?
4579 CHARSET_TYPE_96 : CHARSET_TYPE_94);
4580 reg = (iso->esc - ISO_ESC_2_8) & 3;
4581 } else if (iso->esc >= ISO_ESC_2_4_8 &&
4582 iso->esc <= ISO_ESC_2_4_15) {
4583 type = ((iso->esc >= ISO_ESC_2_4_12) ?
4584 CHARSET_TYPE_96X96 :
4585 CHARSET_TYPE_94X94);
4586 reg = (iso->esc - ISO_ESC_2_4_8) & 3;
4588 /* Can this ever be reached? -slb */
4593 cs = CHARSET_BY_ATTRIBUTES(type, c,
4594 *flags & CODING_STATE_R2L ?
4595 CHARSET_RIGHT_TO_LEFT :
4596 CHARSET_LEFT_TO_RIGHT);
4602 iso->esc_bytes[iso->esc_bytes_index++] = (unsigned char)c;
4606 if (check_invalid_charsets && !CHARSETP(iso->charset[reg]))
4607 /* can't invoke something that ain't there. */
4609 iso->esc = ISO_ESC_SINGLE_SHIFT;
4610 *flags &= CODING_STATE_ISO2022_LOCK;
4612 *flags |= CODING_STATE_SS2;
4614 *flags |= CODING_STATE_SS3;
4618 if (check_invalid_charsets && !CHARSETP(iso->charset[reg]))
4619 /* can't invoke something that ain't there. */
4622 iso->register_right = reg;
4624 iso->register_left = reg;
4625 *flags &= CODING_STATE_ISO2022_LOCK;
4626 iso->esc = ISO_ESC_LOCKING_SHIFT;
4630 if (NILP(cs) && check_invalid_charsets) {
4631 iso->invalid_designated[reg] = 1;
4632 iso->charset[reg] = Vcharset_ascii;
4633 iso->esc = ISO_ESC_DESIGNATE;
4634 *flags &= CODING_STATE_ISO2022_LOCK;
4635 iso->output_literally = 1;
4636 if (iso->switched_dir_and_no_valid_charset_yet) {
4637 /* We encountered a switch-direction followed by an
4638 invalid designation. Ensure that the switch-direction
4639 gets outputted; otherwise it will probably get eaten
4640 when the text is written out again. */
4641 iso->switched_dir_and_no_valid_charset_yet = 0;
4642 iso->output_direction_sequence = 1;
4643 /* And make sure that the switch-dir going the other
4644 way gets outputted, as well. */
4645 iso->invalid_switch_dir = 1;
4649 /* This function is called with CODESYS equal to nil when
4650 doing coding-system detection. */
4651 if (!NILP(codesys)) {
4652 charset_conversion_spec_dynarr *dyn =
4653 XCODING_SYSTEM(codesys)->iso2022.input_conv;
4658 for (i = 0; i < Dynarr_length(dyn); i++) {
4659 struct charset_conversion_spec *spec =
4661 if (EQ(cs, spec->from_charset))
4662 cs = spec->to_charset;
4667 iso->charset[reg] = cs;
4668 iso->esc = ISO_ESC_DESIGNATE;
4669 *flags &= CODING_STATE_ISO2022_LOCK;
4670 if (iso->invalid_designated[reg]) {
4671 iso->invalid_designated[reg] = 0;
4672 iso->output_literally = 1;
4674 if (iso->switched_dir_and_no_valid_charset_yet)
4675 iso->switched_dir_and_no_valid_charset_yet = 0;
4680 detect_coding_iso2022(struct detection_state *st, const Extbyte * src,
4681 Lstream_data_count n)
4685 /* #### There are serious deficiencies in the recognition mechanism
4686 here. This needs to be much smarter if it's going to cut it.
4687 The sequence "\xff\x0f" is currently detected as LOCK_SHIFT while
4688 it should be detected as Latin-1.
4689 All the ISO2022 stuff in this file should be synced up with the
4690 code from FSF Emacs-20.4, in which Mule should be more or less stable.
4691 Perhaps we should wait till R2L works in FSF Emacs? */
4693 if (!st->iso2022.initted) {
4694 reset_iso2022(Qnil, &st->iso2022.iso);
4695 st->iso2022.mask = (CODING_CATEGORY_ISO_7_MASK |
4696 CODING_CATEGORY_ISO_8_DESIGNATE_MASK |
4697 CODING_CATEGORY_ISO_8_1_MASK |
4698 CODING_CATEGORY_ISO_8_2_MASK |
4699 CODING_CATEGORY_ISO_LOCK_SHIFT_MASK);
4700 st->iso2022.flags = 0;
4701 st->iso2022.high_byte_count = 0;
4702 st->iso2022.saw_single_shift = 0;
4703 st->iso2022.initted = 1;
4706 mask = st->iso2022.mask;
4709 const unsigned char c = *(const unsigned char *)src++;
4711 mask &= ~CODING_CATEGORY_ISO_7_MASK;
4712 st->iso2022.high_byte_count++;
4714 if (st->iso2022.high_byte_count
4715 && !st->iso2022.saw_single_shift) {
4716 if (st->iso2022.high_byte_count & 1)
4717 /* odd number of high bytes; assume not iso-8-2 */
4718 mask &= ~CODING_CATEGORY_ISO_8_2_MASK;
4720 st->iso2022.high_byte_count = 0;
4721 st->iso2022.saw_single_shift = 0;
4723 mask &= ~CODING_CATEGORY_ISO_7_MASK;
4725 if (!(st->iso2022.flags & CODING_STATE_ESCAPE)
4726 && (BYTE_C0_P(c) || BYTE_C1_P(c))) { /* control chars */
4728 /* Allow and ignore control characters that you might
4729 reasonably see in a text file */
4734 case 8: /* backspace */
4735 case 11: /* vertical tab */
4736 case 12: /* form feed */
4737 case 26: /* MS-DOS C-z junk */
4738 case 31: /* '^_' -- for info */
4739 goto label_continue_loop;
4746 if ((st->iso2022.flags & CODING_STATE_ESCAPE) || BYTE_C0_P(c)
4748 if (parse_iso2022_esc(Qnil, &st->iso2022.iso, c,
4749 &st->iso2022.flags, 0)) {
4750 switch (st->iso2022.iso.esc) {
4751 case ISO_ESC_DESIGNATE:
4752 mask &= ~CODING_CATEGORY_ISO_8_1_MASK;
4753 mask &= ~CODING_CATEGORY_ISO_8_2_MASK;
4755 case ISO_ESC_LOCKING_SHIFT:
4756 mask = CODING_CATEGORY_ISO_LOCK_SHIFT_MASK;
4757 goto ran_out_of_chars;
4758 case ISO_ESC_SINGLE_SHIFT:
4759 mask &= ~CODING_CATEGORY_ISO_8_DESIGNATE_MASK;
4760 st->iso2022.saw_single_shift = 1;
4764 case ISO_ESC_NOTHING:
4777 case ISO_ESC_2_4_10:
4778 case ISO_ESC_2_4_11:
4779 case ISO_ESC_2_4_12:
4780 case ISO_ESC_2_4_13:
4781 case ISO_ESC_2_4_14:
4782 case ISO_ESC_2_4_15:
4784 case ISO_ESC_5_11_0:
4785 case ISO_ESC_5_11_1:
4786 case ISO_ESC_5_11_2:
4787 case ISO_ESC_DIRECTIONALITY:
4788 case ISO_ESC_LITERAL:
4794 goto ran_out_of_chars;
4797 label_continue_loop:;
4804 static int postprocess_iso2022_mask(int mask)
4806 /* #### kind of cheesy */
4807 /* If seven-bit ISO is allowed, then assume that the encoding is
4808 entirely seven-bit and turn off the eight-bit ones. */
4809 if (mask & CODING_CATEGORY_ISO_7_MASK)
4810 mask &= ~(CODING_CATEGORY_ISO_8_DESIGNATE_MASK |
4811 CODING_CATEGORY_ISO_8_1_MASK |
4812 CODING_CATEGORY_ISO_8_2_MASK);
4816 /* If FLAGS is a null pointer or specifies right-to-left motion,
4817 output a switch-dir-to-left-to-right sequence to DST.
4818 Also update FLAGS if it is not a null pointer.
4819 If INTERNAL_P is set, we are outputting in internal format and
4820 need to handle the CSI differently. */
4823 restore_left_to_right_direction(Lisp_Coding_System * codesys,
4824 unsigned_char_dynarr * dst,
4825 unsigned int *flags, int internal_p)
4827 if (!flags || (*flags & CODING_STATE_R2L)) {
4828 if (CODING_SYSTEM_ISO2022_SEVEN(codesys)) {
4829 Dynarr_add(dst, ISO_CODE_ESC);
4830 Dynarr_add(dst, '[');
4831 } else if (internal_p)
4832 DECODE_ADD_BINARY_CHAR(ISO_CODE_CSI, dst);
4834 Dynarr_add(dst, ISO_CODE_CSI);
4835 Dynarr_add(dst, '0');
4836 Dynarr_add(dst, ']');
4838 *flags &= ~CODING_STATE_R2L;
4842 /* If FLAGS is a null pointer or specifies a direction different from
4843 DIRECTION (which should be either CHARSET_RIGHT_TO_LEFT or
4844 CHARSET_LEFT_TO_RIGHT), output the appropriate switch-dir escape
4845 sequence to DST. Also update FLAGS if it is not a null pointer.
4846 If INTERNAL_P is set, we are outputting in internal format and
4847 need to handle the CSI differently. */
4850 ensure_correct_direction(int direction, Lisp_Coding_System * codesys,
4851 unsigned_char_dynarr * dst, unsigned int *flags,
4854 if ((!flags || (*flags & CODING_STATE_R2L)) &&
4855 direction == CHARSET_LEFT_TO_RIGHT)
4856 restore_left_to_right_direction(codesys, dst, flags,
4858 else if (!CODING_SYSTEM_ISO2022_NO_ISO6429(codesys)
4859 && (!flags || !(*flags & CODING_STATE_R2L)) &&
4860 direction == CHARSET_RIGHT_TO_LEFT) {
4861 if (CODING_SYSTEM_ISO2022_SEVEN(codesys)) {
4862 Dynarr_add(dst, ISO_CODE_ESC);
4863 Dynarr_add(dst, '[');
4864 } else if (internal_p)
4865 DECODE_ADD_BINARY_CHAR(ISO_CODE_CSI, dst);
4867 Dynarr_add(dst, ISO_CODE_CSI);
4868 Dynarr_add(dst, '2');
4869 Dynarr_add(dst, ']');
4871 *flags |= CODING_STATE_R2L;
4875 /* Convert ISO2022-format data to internal format. */
4878 decode_coding_iso2022(lstream_t decoding, const Extbyte * src,
4879 unsigned_char_dynarr * dst, Lstream_data_count n)
4881 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
4882 unsigned int flags = str->flags;
4883 unsigned int ch = str->ch;
4884 eol_type_t eol_type = str->eol_type;
4885 #ifdef ENABLE_COMPOSITE_CHARS
4886 unsigned_char_dynarr *real_dst = dst;
4888 Lisp_Object coding_system;
4890 XSETCODING_SYSTEM(coding_system, str->codesys);
4892 #ifdef ENABLE_COMPOSITE_CHARS
4893 if (flags & CODING_STATE_COMPOSITE)
4894 dst = str->iso2022.composite_chars;
4895 #endif /* ENABLE_COMPOSITE_CHARS */
4898 const unsigned char c = *(const unsigned char *)src++;
4899 if (flags & CODING_STATE_ESCAPE) {
4900 /* Within ESC sequence */
4901 int retval = parse_iso2022_esc(
4902 coding_system, &str->iso2022, c, &flags, 1);
4905 switch (str->iso2022.esc) {
4906 #ifdef ENABLE_COMPOSITE_CHARS
4907 case ISO_ESC_START_COMPOSITE:
4908 if (str->iso2022.composite_chars)
4909 Dynarr_reset(str->iso2022.
4912 str->iso2022.composite_chars =
4913 Dynarr_new(unsigned_char);
4914 dst = str->iso2022.composite_chars;
4916 case ISO_ESC_END_COMPOSITE:
4918 Bufbyte comstr[MAX_EMCHAR_LEN];
4921 lookup_composite_char
4922 (Dynarr_atp(dst, 0),
4923 Dynarr_length(dst));
4926 set_charptr_emchar(comstr,
4928 Dynarr_add_many(dst, comstr,
4932 #endif /* ENABLE_COMPOSITE_CHARS */
4934 case ISO_ESC_LITERAL:
4935 DECODE_ADD_BINARY_CHAR(c, dst);
4938 case ISO_ESC_NOTHING:
4951 case ISO_ESC_2_4_10:
4952 case ISO_ESC_2_4_11:
4953 case ISO_ESC_2_4_12:
4954 case ISO_ESC_2_4_13:
4955 case ISO_ESC_2_4_14:
4956 case ISO_ESC_2_4_15:
4958 case ISO_ESC_5_11_0:
4959 case ISO_ESC_5_11_1:
4960 case ISO_ESC_5_11_2:
4961 case ISO_ESC_SINGLE_SHIFT:
4962 case ISO_ESC_LOCKING_SHIFT:
4963 case ISO_ESC_DESIGNATE:
4964 case ISO_ESC_DIRECTIONALITY:
4967 /* Everything else handled already */
4972 /* Attempted error recovery. */
4973 if (str->iso2022.output_direction_sequence)
4974 ensure_correct_direction(flags &
4976 CHARSET_RIGHT_TO_LEFT :
4977 CHARSET_LEFT_TO_RIGHT,
4978 str->codesys, dst, 0,
4980 /* More error recovery. */
4981 if (!retval || str->iso2022.output_literally) {
4982 /* Output the (possibly invalid) sequence */
4984 for (i = 0; i < str->iso2022.esc_bytes_index;
4986 DECODE_ADD_BINARY_CHAR(str->iso2022.
4989 flags &= CODING_STATE_ISO2022_LOCK;
4991 n++, src--; /* Repeat the loop with the same character. */
4993 /* No sense in reprocessing the final byte of the
4994 escape sequence; it could mess things up anyway.
4996 DECODE_ADD_BINARY_CHAR(c, dst);
5000 } else if (BYTE_C0_P(c) || BYTE_C1_P(c)) { /* Control characters */
5002 /***** Error-handling *****/
5004 /* If we were in the middle of a character, dump out the
5005 partial character. */
5006 DECODE_OUTPUT_PARTIAL_CHAR(ch);
5008 /* If we just saw a single-shift character, dump it out.
5009 This may dump out the wrong sort of single-shift character,
5010 but least it will give an indication that something went
5012 if (flags & CODING_STATE_SS2) {
5013 DECODE_ADD_BINARY_CHAR(ISO_CODE_SS2, dst);
5014 flags &= ~CODING_STATE_SS2;
5016 if (flags & CODING_STATE_SS3) {
5017 DECODE_ADD_BINARY_CHAR(ISO_CODE_SS3, dst);
5018 flags &= ~CODING_STATE_SS3;
5021 /***** Now handle the control characters. *****/
5024 DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst);
5026 flags &= CODING_STATE_ISO2022_LOCK;
5028 if (!parse_iso2022_esc
5029 (coding_system, &str->iso2022, c, &flags, 1))
5030 DECODE_ADD_BINARY_CHAR(c, dst);
5031 } else { /* Graphic characters */
5032 Lisp_Object charset;
5036 DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst);
5038 /* Now determine the charset. */
5039 reg = ((flags & CODING_STATE_SS2) ? 2
5040 : (flags & CODING_STATE_SS3) ? 3
5041 : !BYTE_ASCII_P(c) ? str->iso2022.register_right
5042 : str->iso2022.register_left);
5043 charset = str->iso2022.charset[reg];
5045 /* Error checking: */
5046 if (!CHARSETP(charset)
5047 || str->iso2022.invalid_designated[reg]
5049 (((c & 0x7F) == ' ' || (c & 0x7F) == ISO_CODE_DEL)
5050 && XCHARSET_CHARS(charset) == 94))
5051 /* Mrmph. We are trying to invoke a register that has no
5052 or an invalid charset in it, or trying to add a character
5053 outside the range of the charset. Insert that char literally
5054 to preserve it for the output. */
5056 DECODE_OUTPUT_PARTIAL_CHAR(ch);
5057 DECODE_ADD_BINARY_CHAR(c, dst);
5061 /* Things are probably hunky-dorey. */
5063 /* Fetch reverse charset, maybe. */
5064 if (((flags & CODING_STATE_R2L) &&
5065 XCHARSET_DIRECTION(charset) ==
5066 CHARSET_LEFT_TO_RIGHT)
5067 || (!(flags & CODING_STATE_R2L)
5068 && XCHARSET_DIRECTION(charset) ==
5069 CHARSET_RIGHT_TO_LEFT)) {
5070 Lisp_Object new_charset =
5071 XCHARSET_REVERSE_DIRECTION_CHARSET
5073 if (!NILP(new_charset))
5074 charset = new_charset;
5077 lb = XCHARSET_LEADING_BYTE(charset);
5078 switch (XCHARSET_REP_BYTES(charset)) {
5080 DECODE_OUTPUT_PARTIAL_CHAR(ch);
5081 Dynarr_add(dst, c & 0x7F);
5084 case 2: /* one-byte official */
5085 DECODE_OUTPUT_PARTIAL_CHAR(ch);
5086 Dynarr_add(dst, lb);
5087 Dynarr_add(dst, c | 0x80);
5090 case 3: /* one-byte private or two-byte official */
5091 if (XCHARSET_PRIVATE_P(charset)) {
5092 DECODE_OUTPUT_PARTIAL_CHAR(ch);
5094 PRE_LEADING_BYTE_PRIVATE_1);
5095 Dynarr_add(dst, lb);
5096 Dynarr_add(dst, c | 0x80);
5099 Dynarr_add(dst, lb);
5110 default: /* two-byte private */
5113 PRE_LEADING_BYTE_PRIVATE_2);
5114 Dynarr_add(dst, lb);
5115 Dynarr_add(dst, ch | 0x80);
5116 Dynarr_add(dst, c | 0x80);
5124 flags &= CODING_STATE_ISO2022_LOCK;
5127 label_continue_loop:;
5130 if (flags & CODING_STATE_END)
5131 DECODE_OUTPUT_PARTIAL_CHAR(ch);
5137 /***** ISO2022 encoder *****/
5139 /* Designate CHARSET into register REG. */
5142 iso2022_designate(Lisp_Object charset, unsigned char reg,
5143 encoding_stream_t str, unsigned_char_dynarr * dst)
5145 static const char inter94[] = "()*+";
5146 static const char inter96[] = ",-./";
5148 unsigned char final;
5149 Lisp_Object old_charset = str->iso2022.charset[reg];
5151 str->iso2022.charset[reg] = charset;
5152 if (!CHARSETP(charset))
5153 /* charset might be an initial nil or t. */
5155 type = XCHARSET_TYPE(charset);
5156 final = XCHARSET_FINAL(charset);
5157 if (!str->iso2022.force_charset_on_output[reg] &&
5158 CHARSETP(old_charset) &&
5159 XCHARSET_TYPE(old_charset) == type &&
5160 XCHARSET_FINAL(old_charset) == final)
5163 str->iso2022.force_charset_on_output[reg] = 0;
5166 charset_conversion_spec_dynarr *dyn =
5167 str->codesys->iso2022.output_conv;
5172 for (i = 0; i < Dynarr_length(dyn); i++) {
5173 struct charset_conversion_spec *spec =
5175 if (EQ(charset, spec->from_charset))
5176 charset = spec->to_charset;
5181 Dynarr_add(dst, ISO_CODE_ESC);
5183 case CHARSET_TYPE_94:
5184 Dynarr_add(dst, inter94[reg]);
5186 case CHARSET_TYPE_96:
5187 Dynarr_add(dst, inter96[reg]);
5189 case CHARSET_TYPE_94X94:
5190 Dynarr_add(dst, '$');
5191 if (reg != 0 || !(CODING_SYSTEM_ISO2022_SHORT(str->codesys))
5192 || final < '@' || final > 'B')
5193 Dynarr_add(dst, inter94[reg]);
5195 case CHARSET_TYPE_96X96:
5196 Dynarr_add(dst, '$');
5197 Dynarr_add(dst, inter96[reg]);
5202 Dynarr_add(dst, final);
5206 ensure_normal_shift(encoding_stream_t str, unsigned_char_dynarr * dst)
5208 if (str->iso2022.register_left != 0) {
5209 Dynarr_add(dst, ISO_CODE_SI);
5210 str->iso2022.register_left = 0;
5215 ensure_shift_out(encoding_stream_t str, unsigned_char_dynarr * dst)
5217 if (str->iso2022.register_left != 1) {
5218 Dynarr_add(dst, ISO_CODE_SO);
5219 str->iso2022.register_left = 1;
5223 /* Convert internally-formatted data to ISO2022 format. */
5226 encode_coding_iso2022(lstream_t encoding, const Bufbyte * src,
5227 unsigned_char_dynarr * dst, Lstream_data_count n)
5229 unsigned char charmask, c;
5230 unsigned char char_boundary;
5231 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
5232 unsigned int flags = str->flags;
5233 unsigned int ch = str->ch;
5234 Lisp_Coding_System *codesys = str->codesys;
5235 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE(str->codesys);
5237 Lisp_Object charset;
5240 #ifdef ENABLE_COMPOSITE_CHARS
5241 /* flags for handling composite chars. We do a little switcharoo
5242 on the source while we're outputting the composite char. */
5243 unsigned int saved_n = 0;
5244 const unsigned char *saved_src = NULL;
5245 int in_composite = 0;
5246 #endif /* ENABLE_COMPOSITE_CHARS */
5248 char_boundary = str->iso2022.current_char_boundary;
5249 charset = str->iso2022.current_charset;
5250 half = str->iso2022.current_half;
5252 #ifdef ENABLE_COMPOSITE_CHARS
5258 if (BYTE_ASCII_P(c)) { /* Processing ASCII character */
5261 restore_left_to_right_direction(codesys, dst, &flags,
5264 /* Make sure G0 contains ASCII */
5265 if ((c > ' ' && c < ISO_CODE_DEL) ||
5266 !CODING_SYSTEM_ISO2022_NO_ASCII_CNTL(codesys)) {
5267 ensure_normal_shift(str, dst);
5268 iso2022_designate(Vcharset_ascii, 0, str, dst);
5271 /* If necessary, restore everything to the default state
5274 !(CODING_SYSTEM_ISO2022_NO_ASCII_EOL(codesys))) {
5275 restore_left_to_right_direction(codesys, dst,
5278 ensure_normal_shift(str, dst);
5280 for (i = 0; i < 4; i++) {
5281 Lisp_Object initial_charset =
5282 CODING_SYSTEM_ISO2022_INITIAL_CHARSET
5284 iso2022_designate(initial_charset, i,
5289 if (eol_type != EOL_LF
5290 && eol_type != EOL_AUTODETECT)
5291 Dynarr_add(dst, '\r');
5292 if (eol_type != EOL_CR)
5295 if (CODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys)
5296 && fit_to_be_escape_quoted(c))
5297 Dynarr_add(dst, ISO_CODE_ESC);
5303 else if (BUFBYTE_LEADING_BYTE_P(c) || BUFBYTE_LEADING_BYTE_P(ch)) { /* Processing Leading Byte */
5305 charset = CHARSET_BY_LEADING_BYTE(c);
5306 if (LEADING_BYTE_PREFIX_P(c))
5308 else if (!EQ(charset, Vcharset_control_1)
5309 #ifdef ENABLE_COMPOSITE_CHARS
5310 && !EQ(charset, Vcharset_composite)
5315 ensure_correct_direction(XCHARSET_DIRECTION
5319 /* Now determine which register to use. */
5321 for (i = 0; i < 4; i++) {
5322 if (EQ(charset, str->iso2022.charset[i])
5324 CODING_SYSTEM_ISO2022_INITIAL_CHARSET
5332 if (XCHARSET_GRAPHIC(charset) != 0) {
5334 (str->iso2022.charset[1])
5336 (!CODING_SYSTEM_ISO2022_SEVEN
5339 CODING_SYSTEM_ISO2022_LOCK_SHIFT
5356 iso2022_designate(charset, reg, str, dst);
5358 /* Now invoke that register. */
5361 ensure_normal_shift(str, dst);
5366 if (CODING_SYSTEM_ISO2022_SEVEN
5368 ensure_shift_out(str, dst);
5375 if (CODING_SYSTEM_ISO2022_SEVEN
5377 Dynarr_add(dst, ISO_CODE_ESC);
5378 Dynarr_add(dst, 'N');
5381 Dynarr_add(dst, ISO_CODE_SS2);
5387 if (CODING_SYSTEM_ISO2022_SEVEN
5389 Dynarr_add(dst, ISO_CODE_ESC);
5390 Dynarr_add(dst, 'O');
5393 Dynarr_add(dst, ISO_CODE_SS3);
5403 } else { /* Processing Non-ASCII character */
5404 charmask = (half == 0 ? 0x7F : 0xFF);
5406 if (EQ(charset, Vcharset_control_1)) {
5407 if (CODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys)
5408 && fit_to_be_escape_quoted(c))
5409 Dynarr_add(dst, ISO_CODE_ESC);
5410 /* you asked for it ... */
5411 Dynarr_add(dst, c - 0x20);
5413 switch (XCHARSET_REP_BYTES(charset)) {
5415 Dynarr_add(dst, c & charmask);
5418 if (XCHARSET_PRIVATE_P(charset)) {
5419 Dynarr_add(dst, c & charmask);
5422 #ifdef ENABLE_COMPOSITE_CHARS
5425 Vcharset_composite)) {
5427 /* #### Bother! We don't know how to
5434 (Vcharset_composite,
5439 composite_char_string
5448 n = XSTRING_LENGTH(lstr);
5451 Dynarr_add(dst, '0'); /* start composing */
5454 #endif /* ENABLE_COMPOSITE_CHARS */
5471 Dynarr_add(dst, ch & charmask);
5472 Dynarr_add(dst, c & charmask);
5486 #ifdef ENABLE_COMPOSITE_CHARS
5491 Dynarr_add(dst, ISO_CODE_ESC);
5492 Dynarr_add(dst, '1'); /* end composing */
5493 goto back_to_square_n; /* Wheeeeeeeee ..... */
5495 #endif /* ENABLE_COMPOSITE_CHARS */
5497 if (char_boundary && flags & CODING_STATE_END) {
5498 restore_left_to_right_direction(codesys, dst, &flags, 0);
5499 ensure_normal_shift(str, dst);
5500 for (i = 0; i < 4; i++) {
5501 Lisp_Object initial_charset =
5502 CODING_SYSTEM_ISO2022_INITIAL_CHARSET(codesys, i);
5503 iso2022_designate(initial_charset, i, str, dst);
5509 str->iso2022.current_char_boundary = char_boundary;
5510 str->iso2022.current_charset = charset;
5511 str->iso2022.current_half = half;
5513 /* Verbum caro factum est! */
5517 /************************************************************************/
5518 /* No-conversion methods */
5519 /************************************************************************/
5521 /* This is used when reading in "binary" files -- i.e. files that may
5522 contain all 256 possible byte values and that are not to be
5523 interpreted as being in any particular decoding. */
5525 decode_coding_no_conversion(lstream_t decoding, const Extbyte * src,
5526 unsigned_char_dynarr * dst, Lstream_data_count n)
5528 decoding_stream_t str = DECODING_STREAM_DATA(decoding);
5529 unsigned int flags = str->flags;
5530 unsigned int ch = str->ch;
5531 eol_type_t eol_type = str->eol_type;
5534 const unsigned char c = *(const unsigned char *)src++;
5536 DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst);
5537 DECODE_ADD_BINARY_CHAR(c, dst);
5538 label_continue_loop:;
5541 DECODE_HANDLE_END_OF_CONVERSION(flags, ch, dst);
5548 encode_coding_no_conversion(lstream_t encoding, const Bufbyte * src,
5549 unsigned_char_dynarr * dst, Lstream_data_count n)
5552 encoding_stream_t str = ENCODING_STREAM_DATA(encoding);
5553 unsigned int flags = str->flags;
5554 unsigned int ch = str->ch;
5555 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE(str->codesys);
5560 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
5561 Dynarr_add(dst, '\r');
5562 if (eol_type != EOL_CR)
5563 Dynarr_add(dst, '\n');
5565 } else if (BYTE_ASCII_P(c)) {
5568 } else if (BUFBYTE_LEADING_BYTE_P(c)) {
5570 if (c == LEADING_BYTE_LATIN_ISO8859_1 ||
5571 c == LEADING_BYTE_CONTROL_1)
5574 Dynarr_add(dst, '~'); /* untranslatable character */
5576 if (ch == LEADING_BYTE_LATIN_ISO8859_1)
5578 else if (ch == LEADING_BYTE_CONTROL_1) {
5580 Dynarr_add(dst, c - 0x20);
5582 /* else it should be the second or third byte of an
5583 untranslatable character, so ignore it */
5592 /************************************************************************/
5593 /* Initialization */
5594 /************************************************************************/
5596 void syms_of_file_coding(void)
5598 INIT_LRECORD_IMPLEMENTATION(coding_system);
5600 DEFERROR_STANDARD(Qcoding_system_error, Qio_error);
5602 DEFSUBR(Fcoding_system_p);
5603 DEFSUBR(Ffind_coding_system);
5604 DEFSUBR(Fget_coding_system);
5605 DEFSUBR(Fcoding_system_list);
5606 DEFSUBR(Fcoding_system_name);
5607 DEFSUBR(Fmake_coding_system);
5608 DEFSUBR(Fcopy_coding_system);
5609 DEFSUBR(Fcoding_system_canonical_name_p);
5610 DEFSUBR(Fcoding_system_alias_p);
5611 DEFSUBR(Fcoding_system_aliasee);
5612 DEFSUBR(Fdefine_coding_system_alias);
5613 DEFSUBR(Fsubsidiary_coding_system);
5615 DEFSUBR(Fcoding_system_type);
5616 DEFSUBR(Fcoding_system_doc_string);
5618 DEFSUBR(Fcoding_system_charset);
5620 DEFSUBR(Fcoding_system_property);
5622 DEFSUBR(Fcoding_category_list);
5623 DEFSUBR(Fset_coding_priority_list);
5624 DEFSUBR(Fcoding_priority_list);
5625 DEFSUBR(Fset_coding_category_system);
5626 DEFSUBR(Fcoding_category_system);
5628 DEFSUBR(Fdetect_coding_region);
5629 DEFSUBR(Fdecode_coding_region);
5630 DEFSUBR(Fencode_coding_region);
5632 DEFSUBR(Fdecode_shift_jis_char);
5633 DEFSUBR(Fencode_shift_jis_char);
5634 DEFSUBR(Fdecode_big5_char);
5635 DEFSUBR(Fencode_big5_char);
5636 DEFSUBR(Fset_ucs_char);
5638 DEFSUBR(Fset_char_ucs);
5641 defsymbol(&Qcoding_systemp, "coding-system-p");
5642 defsymbol(&Qno_conversion, "no-conversion");
5643 defsymbol(&Qraw_text, "raw-text");
5645 defsymbol(&Qbig5, "big5");
5646 defsymbol(&Qshift_jis, "shift-jis");
5647 defsymbol(&Qucs4, "ucs-4");
5648 defsymbol(&Qutf8, "utf-8");
5649 defsymbol(&Qccl, "ccl");
5650 defsymbol(&Qiso2022, "iso2022");
5652 defsymbol(&Qmnemonic, "mnemonic");
5653 defsymbol(&Qeol_type, "eol-type");
5654 defsymbol(&Qpost_read_conversion, "post-read-conversion");
5655 defsymbol(&Qpre_write_conversion, "pre-write-conversion");
5657 defsymbol(&Qcr, "cr");
5658 defsymbol(&Qlf, "lf");
5659 defsymbol(&Qcrlf, "crlf");
5660 defsymbol(&Qeol_cr, "eol-cr");
5661 defsymbol(&Qeol_lf, "eol-lf");
5662 defsymbol(&Qeol_crlf, "eol-crlf");
5664 defsymbol(&Qcharset_g0, "charset-g0");
5665 defsymbol(&Qcharset_g1, "charset-g1");
5666 defsymbol(&Qcharset_g2, "charset-g2");
5667 defsymbol(&Qcharset_g3, "charset-g3");
5668 defsymbol(&Qforce_g0_on_output, "force-g0-on-output");
5669 defsymbol(&Qforce_g1_on_output, "force-g1-on-output");
5670 defsymbol(&Qforce_g2_on_output, "force-g2-on-output");
5671 defsymbol(&Qforce_g3_on_output, "force-g3-on-output");
5672 defsymbol(&Qno_iso6429, "no-iso6429");
5673 defsymbol(&Qinput_charset_conversion, "input-charset-conversion");
5674 defsymbol(&Qoutput_charset_conversion, "output-charset-conversion");
5676 defsymbol(&Qno_ascii_eol, "no-ascii-eol");
5677 defsymbol(&Qno_ascii_cntl, "no-ascii-cntl");
5678 defsymbol(&Qseven, "seven");
5679 defsymbol(&Qlock_shift, "lock-shift");
5680 defsymbol(&Qescape_quoted, "escape-quoted");
5682 defsymbol(&Qencode, "encode");
5683 defsymbol(&Qdecode, "decode");
5686 defsymbol(&coding_category_symbol[CODING_CATEGORY_SHIFT_JIS],
5688 defsymbol(&coding_category_symbol[CODING_CATEGORY_BIG5], "big5");
5689 defsymbol(&coding_category_symbol[CODING_CATEGORY_UCS4], "ucs-4");
5690 defsymbol(&coding_category_symbol[CODING_CATEGORY_UTF8], "utf-8");
5691 defsymbol(&coding_category_symbol[CODING_CATEGORY_ISO_7], "iso-7");
5692 defsymbol(&coding_category_symbol[CODING_CATEGORY_ISO_8_DESIGNATE],
5694 defsymbol(&coding_category_symbol[CODING_CATEGORY_ISO_8_1], "iso-8-1");
5695 defsymbol(&coding_category_symbol[CODING_CATEGORY_ISO_8_2], "iso-8-2");
5696 defsymbol(&coding_category_symbol[CODING_CATEGORY_ISO_LOCK_SHIFT],
5699 defsymbol(&coding_category_symbol[CODING_CATEGORY_NO_CONVERSION],
5703 void lstream_type_create_file_coding(void)
5705 LSTREAM_HAS_METHOD(decoding, reader);
5706 LSTREAM_HAS_METHOD(decoding, writer);
5707 LSTREAM_HAS_METHOD(decoding, rewinder);
5708 LSTREAM_HAS_METHOD(decoding, seekable_p);
5709 LSTREAM_HAS_METHOD(decoding, flusher);
5710 LSTREAM_HAS_METHOD(decoding, closer);
5711 LSTREAM_HAS_METHOD(decoding, marker);
5713 LSTREAM_HAS_METHOD(encoding, reader);
5714 LSTREAM_HAS_METHOD(encoding, writer);
5715 LSTREAM_HAS_METHOD(encoding, rewinder);
5716 LSTREAM_HAS_METHOD(encoding, seekable_p);
5717 LSTREAM_HAS_METHOD(encoding, flusher);
5718 LSTREAM_HAS_METHOD(encoding, closer);
5719 LSTREAM_HAS_METHOD(encoding, marker);
5722 void vars_of_file_coding(void)
5726 fcd = xnew(struct file_coding_dump);
5727 dump_add_root_struct_ptr(&fcd, &fcd_description);
5729 /* Initialize to something reasonable ... */
5730 for (i = 0; i < CODING_CATEGORY_LAST; i++) {
5731 fcd->coding_category_system[i] = Qnil;
5732 fcd->coding_category_by_priority[i] = i;
5735 Fprovide(intern("file-coding"));
5737 DEFVAR_LISP("keyboard-coding-system", &Vkeyboard_coding_system /*
5738 Coding system used for TTY keyboard input.
5739 Not used under a windowing system.
5741 Vkeyboard_coding_system = Qnil;
5743 DEFVAR_LISP("terminal-coding-system", &Vterminal_coding_system /*
5744 Coding system used for TTY display output.
5745 Not used under a windowing system.
5747 Vterminal_coding_system = Qnil;
5749 DEFVAR_LISP("coding-system-for-read", &Vcoding_system_for_read /*
5750 Overriding coding system used when reading from a file or process.
5751 You should bind this variable with `let', but do not set it globally.
5752 If this is non-nil, it specifies the coding system that will be used
5753 to decode input on read operations, such as from a file or process.
5754 It overrides `buffer-file-coding-system-for-read',
5755 `insert-file-contents-pre-hook', etc. Use those variables instead of
5756 this one for permanent changes to the environment. */ );
5757 Vcoding_system_for_read = Qnil;
5759 DEFVAR_LISP("coding-system-for-write", &Vcoding_system_for_write /*
5760 Overriding coding system used when writing to a file or process.
5761 You should bind this variable with `let', but do not set it globally.
5762 If this is non-nil, it specifies the coding system that will be used
5763 to encode output for write operations, such as to a file or process.
5764 It overrides `buffer-file-coding-system', `write-region-pre-hook', etc.
5765 Use those variables instead of this one for permanent changes to the
5767 Vcoding_system_for_write = Qnil;
5769 DEFVAR_LISP("file-name-coding-system", &Vfile_name_coding_system /*
5770 Coding system used to convert pathnames when accessing files.
5772 Vfile_name_coding_system = Qnil;
5774 DEFVAR_BOOL("enable-multibyte-characters", &enable_multibyte_characters /*
5775 Non-nil means the buffer contents are regarded as multi-byte form
5776 of characters, not a binary code. This affects the display, file I/O,
5777 and behaviors of various editing commands.
5779 Setting this to nil does not do anything.
5781 enable_multibyte_characters = 1;
5784 void complex_vars_of_file_coding(void)
5786 staticpro(&Vcoding_system_hash_table);
5787 Vcoding_system_hash_table =
5788 make_lisp_hash_table(50, HASH_TABLE_NON_WEAK, HASH_TABLE_EQ);
5790 the_codesys_prop_dynarr = Dynarr_new(codesys_prop);
5791 dump_add_root_struct_ptr(&the_codesys_prop_dynarr,
5792 &codesys_prop_dynarr_description);
5794 #define DEFINE_CODESYS_PROP(Prop_Type, Sym) do \
5796 struct codesys_prop csp; \
5798 csp.prop_type = (Prop_Type); \
5799 Dynarr_add (the_codesys_prop_dynarr, csp); \
5802 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qmnemonic);
5803 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qeol_type);
5804 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qeol_cr);
5805 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qeol_crlf);
5806 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qeol_lf);
5807 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qpost_read_conversion);
5808 DEFINE_CODESYS_PROP(CODESYS_PROP_ALL_OK, Qpre_write_conversion);
5810 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qcharset_g0);
5811 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qcharset_g1);
5812 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qcharset_g2);
5813 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qcharset_g3);
5814 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qforce_g0_on_output);
5815 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qforce_g1_on_output);
5816 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qforce_g2_on_output);
5817 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qforce_g3_on_output);
5818 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qshort);
5819 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qno_ascii_eol);
5820 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qno_ascii_cntl);
5821 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qseven);
5822 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qlock_shift);
5823 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qno_iso6429);
5824 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qescape_quoted);
5825 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qinput_charset_conversion);
5826 DEFINE_CODESYS_PROP(CODESYS_PROP_ISO2022, Qoutput_charset_conversion);
5828 DEFINE_CODESYS_PROP(CODESYS_PROP_CCL, Qencode);
5829 DEFINE_CODESYS_PROP(CODESYS_PROP_CCL, Qdecode);
5831 /* Need to create this here or we're really screwed. */
5833 (Qraw_text, Qno_conversion,
5835 ("Raw text, which means it converts only line-break-codes."),
5836 list2(Qmnemonic, build_string("Raw")));
5839 (Qbinary, Qno_conversion,
5840 build_string("Binary, which means it does not convert anything."),
5841 list4(Qeol_type, Qlf, Qmnemonic, build_string("Binary")));
5843 Fdefine_coding_system_alias(Qno_conversion, Qraw_text);
5845 Fdefine_coding_system_alias(Qfile_name, Qbinary);
5847 Fdefine_coding_system_alias(Qterminal, Qbinary);
5848 Fdefine_coding_system_alias(Qkeyboard, Qbinary);
5850 /* Need this for bootstrapping */
5851 fcd->coding_category_system[CODING_CATEGORY_NO_CONVERSION] =
5852 Fget_coding_system(Qraw_text);
5858 for (i = 0; i < countof(fcd->ucs_to_mule_table); i++)
5859 fcd->ucs_to_mule_table[i] = Qnil;
5861 staticpro(&mule_to_ucs_table);
5862 mule_to_ucs_table = Fmake_char_table(Qgeneric);