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 XEmacs.
7 XEmacs is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with XEmacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Synched up with: Mule 2.3. Not in FSF. */
24 /* Rewritten by Ben Wing <ben@xemacs.org>. */
37 #include "file-coding.h"
39 Lisp_Object Qbuffer_file_coding_system, 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 + 1];
50 /* Coding system currently associated with each coding category. */
51 Lisp_Object coding_category_system[CODING_CATEGORY_LAST + 1];
53 /* Table of all coding categories in decreasing order of priority.
54 This describes a permutation of the possible coding categories. */
55 int coding_category_by_priority[CODING_CATEGORY_LAST + 1];
57 Lisp_Object Qcoding_system_p;
59 Lisp_Object Qraw_text, Qno_conversion, Qccl, Qiso2022;
60 /* Qinternal in general.c */
62 Lisp_Object Qmnemonic, Qeol_type;
63 Lisp_Object Qcr, Qcrlf, Qlf;
64 Lisp_Object Qeol_cr, Qeol_crlf, Qeol_lf;
65 Lisp_Object Qpost_read_conversion;
66 Lisp_Object Qpre_write_conversion;
69 Lisp_Object Qucs4, Qutf8;
70 Lisp_Object Qbig5, Qshift_jis;
71 Lisp_Object Qcharset_g0, Qcharset_g1, Qcharset_g2, Qcharset_g3;
72 Lisp_Object Qforce_g0_on_output, Qforce_g1_on_output;
73 Lisp_Object Qforce_g2_on_output, Qforce_g3_on_output;
74 Lisp_Object Qno_iso6429;
75 Lisp_Object Qinput_charset_conversion, Qoutput_charset_conversion;
76 Lisp_Object Qctext, Qescape_quoted;
77 Lisp_Object Qshort, Qno_ascii_eol, Qno_ascii_cntl, Qseven, Qlock_shift;
79 Lisp_Object Qencode, Qdecode;
81 Lisp_Object Vcoding_system_hash_table;
83 int enable_multibyte_characters;
86 /* Additional information used by the ISO2022 decoder and detector. */
87 struct iso2022_decoder
89 /* CHARSET holds the character sets currently assigned to the G0
90 through G3 variables. It is initialized from the array
91 INITIAL_CHARSET in CODESYS. */
92 Lisp_Object charset[4];
94 /* Which registers are currently invoked into the left (GL) and
95 right (GR) halves of the 8-bit encoding space? */
96 int register_left, register_right;
98 /* ISO_ESC holds a value indicating part of an escape sequence
99 that has already been seen. */
100 enum iso_esc_flag esc;
102 /* This records the bytes we've seen so far in an escape sequence,
103 in case the sequence is invalid (we spit out the bytes unchanged). */
104 unsigned char esc_bytes[8];
106 /* Index for next byte to store in ISO escape sequence. */
109 #ifdef ENABLE_COMPOSITE_CHARS
110 /* Stuff seen so far when composing a string. */
111 unsigned_char_dynarr *composite_chars;
114 /* If we saw an invalid designation sequence for a particular
115 register, we flag it here and switch to ASCII. The next time we
116 see a valid designation for this register, we turn off the flag
117 and do the designation normally, but pretend the sequence was
118 invalid. The effect of all this is that (most of the time) the
119 escape sequences for both the switch to the unknown charset, and
120 the switch back to the known charset, get inserted literally into
121 the buffer and saved out as such. The hope is that we can
122 preserve the escape sequences so that the resulting written out
123 file makes sense. If we don't do any of this, the designation
124 to the invalid charset will be preserved but that switch back
125 to the known charset will probably get eaten because it was
126 the same charset that was already present in the register. */
127 unsigned char invalid_designated[4];
129 /* We try to do similar things as above for direction-switching
130 sequences. If we encountered a direction switch while an
131 invalid designation was present, or an invalid designation
132 just after a direction switch (i.e. no valid designation
133 encountered yet), we insert the direction-switch escape
134 sequence literally into the output stream, and later on
135 insert the corresponding direction-restoring escape sequence
137 unsigned int switched_dir_and_no_valid_charset_yet :1;
138 unsigned int invalid_switch_dir :1;
140 /* Tells the decoder to output the escape sequence literally
141 even though it was valid. Used in the games we play to
142 avoid lossage when we encounter invalid designations. */
143 unsigned int output_literally :1;
144 /* We encountered a direction switch followed by an invalid
145 designation. We didn't output the direction switch
146 literally because we didn't know about the invalid designation;
147 but we have to do so now. */
148 unsigned int output_direction_sequence :1;
151 EXFUN (Fcopy_coding_system, 2);
153 struct detection_state;
156 text_encode_generic (Lstream *encoding, CONST unsigned char *src,
157 unsigned_char_dynarr *dst, unsigned int n);
159 static int detect_coding_sjis (struct detection_state *st,
160 CONST unsigned char *src,
162 static void decode_coding_sjis (Lstream *decoding,
163 CONST unsigned char *src,
164 unsigned_char_dynarr *dst,
166 void char_encode_shift_jis (struct encoding_stream *str, Emchar c,
167 unsigned_char_dynarr *dst, unsigned int *flags);
168 void char_finish_shift_jis (struct encoding_stream *str,
169 unsigned_char_dynarr *dst, unsigned int *flags);
171 static int detect_coding_big5 (struct detection_state *st,
172 CONST unsigned char *src,
174 static void decode_coding_big5 (Lstream *decoding,
175 CONST unsigned char *src,
176 unsigned_char_dynarr *dst, unsigned int n);
177 static void encode_coding_big5 (Lstream *encoding,
178 CONST unsigned char *src,
179 unsigned_char_dynarr *dst, unsigned int n);
180 static int detect_coding_ucs4 (struct detection_state *st,
181 CONST unsigned char *src,
183 static void decode_coding_ucs4 (Lstream *decoding,
184 CONST unsigned char *src,
185 unsigned_char_dynarr *dst, unsigned int n);
186 void char_encode_ucs4 (struct encoding_stream *str, Emchar c,
187 unsigned_char_dynarr *dst, unsigned int *flags);
188 void char_finish_ucs4 (struct encoding_stream *str,
189 unsigned_char_dynarr *dst, unsigned int *flags);
191 static int detect_coding_utf8 (struct detection_state *st,
192 CONST unsigned char *src,
194 static void decode_coding_utf8 (Lstream *decoding,
195 CONST unsigned char *src,
196 unsigned_char_dynarr *dst, unsigned int n);
197 void char_encode_utf8 (struct encoding_stream *str, Emchar c,
198 unsigned_char_dynarr *dst, unsigned int *flags);
199 void char_finish_utf8 (struct encoding_stream *str,
200 unsigned_char_dynarr *dst, unsigned int *flags);
202 static int postprocess_iso2022_mask (int mask);
203 static void reset_iso2022 (Lisp_Object coding_system,
204 struct iso2022_decoder *iso);
205 static int detect_coding_iso2022 (struct detection_state *st,
206 CONST unsigned char *src,
208 static void decode_coding_iso2022 (Lstream *decoding,
209 CONST unsigned char *src,
210 unsigned_char_dynarr *dst, unsigned int n);
211 void char_encode_iso2022 (struct encoding_stream *str, Emchar c,
212 unsigned_char_dynarr *dst, unsigned int *flags);
213 void char_finish_iso2022 (struct encoding_stream *str,
214 unsigned_char_dynarr *dst, unsigned int *flags);
216 static void decode_coding_no_conversion (Lstream *decoding,
217 CONST unsigned char *src,
218 unsigned_char_dynarr *dst,
220 static void encode_coding_no_conversion (Lstream *encoding,
221 CONST unsigned char *src,
222 unsigned_char_dynarr *dst,
224 static void mule_decode (Lstream *decoding, CONST unsigned char *src,
225 unsigned_char_dynarr *dst, unsigned int n);
226 static void mule_encode (Lstream *encoding, CONST unsigned char *src,
227 unsigned_char_dynarr *dst, unsigned int n);
229 typedef struct codesys_prop codesys_prop;
238 Dynarr_declare (codesys_prop);
239 } codesys_prop_dynarr;
241 codesys_prop_dynarr *the_codesys_prop_dynarr;
243 enum codesys_prop_enum
246 CODESYS_PROP_ISO2022,
251 /************************************************************************/
252 /* Coding system functions */
253 /************************************************************************/
255 static Lisp_Object mark_coding_system (Lisp_Object, void (*) (Lisp_Object));
256 static void print_coding_system (Lisp_Object, Lisp_Object, int);
257 static void finalize_coding_system (void *header, int for_disksave);
260 static const struct lrecord_description ccs_description_1[] = {
261 { XD_LISP_OBJECT, offsetof(charset_conversion_spec, from_charset), 2 },
265 static const struct struct_description ccs_description = {
266 sizeof(charset_conversion_spec),
270 static const struct lrecord_description ccsd_description_1[] = {
271 XD_DYNARR_DESC(charset_conversion_spec_dynarr, &ccs_description),
275 static const struct struct_description ccsd_description = {
276 sizeof(charset_conversion_spec_dynarr),
281 static const struct lrecord_description coding_system_description[] = {
282 { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, name), 2 },
283 { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, mnemonic), 3 },
284 { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, eol_lf), 3 },
286 { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, iso2022.initial_charset), 4 },
287 { XD_STRUCT_PTR, offsetof(struct Lisp_Coding_System, iso2022.input_conv), 1, &ccsd_description },
288 { XD_STRUCT_PTR, offsetof(struct Lisp_Coding_System, iso2022.output_conv), 1, &ccsd_description },
289 { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, ccl.decode), 2 },
294 DEFINE_LRECORD_IMPLEMENTATION ("coding-system", coding_system,
295 mark_coding_system, print_coding_system,
296 finalize_coding_system,
297 0, 0, coding_system_description,
298 struct Lisp_Coding_System);
301 mark_coding_system (Lisp_Object obj, void (*markobj) (Lisp_Object))
303 Lisp_Coding_System *codesys = XCODING_SYSTEM (obj);
305 markobj (CODING_SYSTEM_NAME (codesys));
306 markobj (CODING_SYSTEM_DOC_STRING (codesys));
307 markobj (CODING_SYSTEM_MNEMONIC (codesys));
308 markobj (CODING_SYSTEM_EOL_LF (codesys));
309 markobj (CODING_SYSTEM_EOL_CRLF (codesys));
310 markobj (CODING_SYSTEM_EOL_CR (codesys));
312 switch (CODING_SYSTEM_TYPE (codesys))
316 case CODESYS_ISO2022:
317 for (i = 0; i < 4; i++)
318 markobj (CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i));
319 if (codesys->iso2022.input_conv)
321 for (i = 0; i < Dynarr_length (codesys->iso2022.input_conv); i++)
323 struct charset_conversion_spec *ccs =
324 Dynarr_atp (codesys->iso2022.input_conv, i);
325 markobj (ccs->from_charset);
326 markobj (ccs->to_charset);
329 if (codesys->iso2022.output_conv)
331 for (i = 0; i < Dynarr_length (codesys->iso2022.output_conv); i++)
333 struct charset_conversion_spec *ccs =
334 Dynarr_atp (codesys->iso2022.output_conv, i);
335 markobj (ccs->from_charset);
336 markobj (ccs->to_charset);
342 markobj (CODING_SYSTEM_CCL_DECODE (codesys));
343 markobj (CODING_SYSTEM_CCL_ENCODE (codesys));
350 markobj (CODING_SYSTEM_PRE_WRITE_CONVERSION (codesys));
351 return CODING_SYSTEM_POST_READ_CONVERSION (codesys);
355 print_coding_system (Lisp_Object obj, Lisp_Object printcharfun,
358 Lisp_Coding_System *c = XCODING_SYSTEM (obj);
360 error ("printing unreadable object #<coding_system 0x%x>",
363 write_c_string ("#<coding_system ", printcharfun);
364 print_internal (c->name, printcharfun, 1);
365 write_c_string (">", printcharfun);
369 finalize_coding_system (void *header, int for_disksave)
371 Lisp_Coding_System *c = (Lisp_Coding_System *) header;
372 /* Since coding systems never go away, this function is not
373 necessary. But it would be necessary if we changed things
374 so that coding systems could go away. */
375 if (!for_disksave) /* see comment in lstream.c */
377 switch (CODING_SYSTEM_TYPE (c))
380 case CODESYS_ISO2022:
381 if (c->iso2022.input_conv)
383 Dynarr_free (c->iso2022.input_conv);
384 c->iso2022.input_conv = 0;
386 if (c->iso2022.output_conv)
388 Dynarr_free (c->iso2022.output_conv);
389 c->iso2022.output_conv = 0;
400 symbol_to_eol_type (Lisp_Object symbol)
402 CHECK_SYMBOL (symbol);
403 if (NILP (symbol)) return EOL_AUTODETECT;
404 if (EQ (symbol, Qlf)) return EOL_LF;
405 if (EQ (symbol, Qcrlf)) return EOL_CRLF;
406 if (EQ (symbol, Qcr)) return EOL_CR;
408 signal_simple_error ("Unrecognized eol type", symbol);
409 return EOL_AUTODETECT; /* not reached */
413 eol_type_to_symbol (enum eol_type type)
418 case EOL_LF: return Qlf;
419 case EOL_CRLF: return Qcrlf;
420 case EOL_CR: return Qcr;
421 case EOL_AUTODETECT: return Qnil;
426 setup_eol_coding_systems (Lisp_Coding_System *codesys)
428 Lisp_Object codesys_obj;
429 int len = string_length (XSYMBOL (CODING_SYSTEM_NAME (codesys))->name);
430 char *codesys_name = (char *) alloca (len + 7);
432 char *codesys_mnemonic=0;
434 Lisp_Object codesys_name_sym, sub_codesys_obj;
438 XSETCODING_SYSTEM (codesys_obj, codesys);
440 memcpy (codesys_name,
441 string_data (XSYMBOL (CODING_SYSTEM_NAME (codesys))->name), len);
443 if (STRINGP (CODING_SYSTEM_MNEMONIC (codesys)))
445 mlen = XSTRING_LENGTH (CODING_SYSTEM_MNEMONIC (codesys));
446 codesys_mnemonic = (char *) alloca (mlen + 7);
447 memcpy (codesys_mnemonic,
448 XSTRING_DATA (CODING_SYSTEM_MNEMONIC (codesys)), mlen);
451 #define DEFINE_SUB_CODESYS(op_sys, op_sys_abbr, Type) do { \
452 strcpy (codesys_name + len, "-" op_sys); \
454 strcpy (codesys_mnemonic + mlen, op_sys_abbr); \
455 codesys_name_sym = intern (codesys_name); \
456 sub_codesys_obj = Fcopy_coding_system (codesys_obj, codesys_name_sym); \
457 XCODING_SYSTEM_EOL_TYPE (sub_codesys_obj) = Type; \
459 XCODING_SYSTEM_MNEMONIC(sub_codesys_obj) = \
460 build_string (codesys_mnemonic); \
461 CODING_SYSTEM_##Type (codesys) = sub_codesys_obj; \
464 DEFINE_SUB_CODESYS("unix", "", EOL_LF);
465 DEFINE_SUB_CODESYS("dos", ":T", EOL_CRLF);
466 DEFINE_SUB_CODESYS("mac", ":t", EOL_CR);
469 DEFUN ("coding-system-p", Fcoding_system_p, 1, 1, 0, /*
470 Return t if OBJECT is a coding system.
471 A coding system is an object that defines how text containing multiple
472 character sets is encoded into a stream of (typically 8-bit) bytes.
473 The coding system is used to decode the stream into a series of
474 characters (which may be from multiple charsets) when the text is read
475 from a file or process, and is used to encode the text back into the
476 same format when it is written out to a file or process.
478 For example, many ISO2022-compliant coding systems (such as Compound
479 Text, which is used for inter-client data under the X Window System)
480 use escape sequences to switch between different charsets -- Japanese
481 Kanji, for example, is invoked with "ESC $ ( B"; ASCII is invoked
482 with "ESC ( B"; and Cyrillic is invoked with "ESC - L". See
483 `make-coding-system' for more information.
485 Coding systems are normally identified using a symbol, and the
486 symbol is accepted in place of the actual coding system object whenever
487 a coding system is called for. (This is similar to how faces work.)
491 return CODING_SYSTEMP (object) ? Qt : Qnil;
494 DEFUN ("find-coding-system", Ffind_coding_system, 1, 1, 0, /*
495 Retrieve the coding system of the given name.
497 If CODING-SYSTEM-OR-NAME is a coding-system object, it is simply
498 returned. Otherwise, CODING-SYSTEM-OR-NAME should be a symbol.
499 If there is no such coding system, nil is returned. Otherwise the
500 associated coding system object is returned.
502 (coding_system_or_name))
504 if (CODING_SYSTEMP (coding_system_or_name))
505 return coding_system_or_name;
507 if (NILP (coding_system_or_name))
508 coding_system_or_name = Qbinary;
510 CHECK_SYMBOL (coding_system_or_name);
512 return Fgethash (coding_system_or_name, Vcoding_system_hash_table, Qnil);
515 DEFUN ("get-coding-system", Fget_coding_system, 1, 1, 0, /*
516 Retrieve the coding system of the given name.
517 Same as `find-coding-system' except that if there is no such
518 coding system, an error is signaled instead of returning nil.
522 Lisp_Object coding_system = Ffind_coding_system (name);
524 if (NILP (coding_system))
525 signal_simple_error ("No such coding system", name);
526 return coding_system;
529 /* We store the coding systems in hash tables with the names as the key and the
530 actual coding system object as the value. Occasionally we need to use them
531 in a list format. These routines provide us with that. */
532 struct coding_system_list_closure
534 Lisp_Object *coding_system_list;
538 add_coding_system_to_list_mapper (Lisp_Object key, Lisp_Object value,
539 void *coding_system_list_closure)
541 /* This function can GC */
542 struct coding_system_list_closure *cscl =
543 (struct coding_system_list_closure *) coding_system_list_closure;
544 Lisp_Object *coding_system_list = cscl->coding_system_list;
546 *coding_system_list = Fcons (XCODING_SYSTEM (value)->name,
547 *coding_system_list);
551 DEFUN ("coding-system-list", Fcoding_system_list, 0, 0, 0, /*
552 Return a list of the names of all defined coding systems.
556 Lisp_Object coding_system_list = Qnil;
558 struct coding_system_list_closure coding_system_list_closure;
560 GCPRO1 (coding_system_list);
561 coding_system_list_closure.coding_system_list = &coding_system_list;
562 elisp_maphash (add_coding_system_to_list_mapper, Vcoding_system_hash_table,
563 &coding_system_list_closure);
566 return coding_system_list;
569 DEFUN ("coding-system-name", Fcoding_system_name, 1, 1, 0, /*
570 Return the name of the given coding system.
574 coding_system = Fget_coding_system (coding_system);
575 return XCODING_SYSTEM_NAME (coding_system);
578 static Lisp_Coding_System *
579 allocate_coding_system (enum coding_system_type type, Lisp_Object name)
581 Lisp_Coding_System *codesys =
582 alloc_lcrecord_type (Lisp_Coding_System, &lrecord_coding_system);
584 zero_lcrecord (codesys);
585 CODING_SYSTEM_PRE_WRITE_CONVERSION (codesys) = Qnil;
586 CODING_SYSTEM_POST_READ_CONVERSION (codesys) = Qnil;
587 CODING_SYSTEM_EOL_TYPE (codesys) = EOL_AUTODETECT;
588 CODING_SYSTEM_EOL_CRLF (codesys) = Qnil;
589 CODING_SYSTEM_EOL_CR (codesys) = Qnil;
590 CODING_SYSTEM_EOL_LF (codesys) = Qnil;
591 CODING_SYSTEM_TYPE (codesys) = type;
592 CODING_SYSTEM_MNEMONIC (codesys) = Qnil;
594 if (type == CODESYS_ISO2022)
597 for (i = 0; i < 4; i++)
598 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i) = Qnil;
600 else if (type == CODESYS_CCL)
602 CODING_SYSTEM_CCL_DECODE (codesys) = Qnil;
603 CODING_SYSTEM_CCL_ENCODE (codesys) = Qnil;
606 CODING_SYSTEM_NAME (codesys) = name;
612 /* Given a list of charset conversion specs as specified in a Lisp
613 program, parse it into STORE_HERE. */
616 parse_charset_conversion_specs (charset_conversion_spec_dynarr *store_here,
617 Lisp_Object spec_list)
621 EXTERNAL_LIST_LOOP (rest, spec_list)
623 Lisp_Object car = XCAR (rest);
624 Lisp_Object from, to;
625 struct charset_conversion_spec spec;
627 if (!CONSP (car) || !CONSP (XCDR (car)) || !NILP (XCDR (XCDR (car))))
628 signal_simple_error ("Invalid charset conversion spec", car);
629 from = Fget_charset (XCAR (car));
630 to = Fget_charset (XCAR (XCDR (car)));
631 if (XCHARSET_TYPE (from) != XCHARSET_TYPE (to))
632 signal_simple_error_2
633 ("Attempted conversion between different charset types",
635 spec.from_charset = from;
636 spec.to_charset = to;
638 Dynarr_add (store_here, spec);
642 /* Given a dynarr LOAD_HERE of internally-stored charset conversion
643 specs, return the equivalent as the Lisp programmer would see it.
645 If LOAD_HERE is 0, return Qnil. */
648 unparse_charset_conversion_specs (charset_conversion_spec_dynarr *load_here)
655 for (i = 0, result = Qnil; i < Dynarr_length (load_here); i++)
657 struct charset_conversion_spec *ccs = Dynarr_atp (load_here, i);
658 result = Fcons (list2 (ccs->from_charset, ccs->to_charset), result);
661 return Fnreverse (result);
666 DEFUN ("make-coding-system", Fmake_coding_system, 2, 4, 0, /*
667 Register symbol NAME as a coding system.
669 TYPE describes the conversion method used and should be one of
672 Automatic conversion. XEmacs attempts to detect the coding system
675 No conversion. Use this for binary files and such. On output,
676 graphic characters that are not in ASCII or Latin-1 will be
677 replaced by a ?. (For a no-conversion-encoded buffer, these
678 characters will only be present if you explicitly insert them.)
680 Shift-JIS (a Japanese encoding commonly used in PC operating systems).
682 ISO 10646 UCS-4 encoding.
684 ISO 10646 UTF-8 encoding.
686 Any ISO2022-compliant encoding. Among other things, this includes
687 JIS (the Japanese encoding commonly used for e-mail), EUC (the
688 standard Unix encoding for Japanese and other languages), and
689 Compound Text (the encoding used in X11). You can specify more
690 specific information about the conversion with the FLAGS argument.
692 Big5 (the encoding commonly used for Taiwanese).
694 The conversion is performed using a user-written pseudo-code
695 program. CCL (Code Conversion Language) is the name of this
698 Write out or read in the raw contents of the memory representing
699 the buffer's text. This is primarily useful for debugging
700 purposes, and is only enabled when XEmacs has been compiled with
701 DEBUG_XEMACS defined (via the --debug configure option).
702 WARNING: Reading in a file using 'internal conversion can result
703 in an internal inconsistency in the memory representing a
704 buffer's text, which will produce unpredictable results and may
705 cause XEmacs to crash. Under normal circumstances you should
706 never use 'internal conversion.
708 DOC-STRING is a string describing the coding system.
710 PROPS is a property list, describing the specific nature of the
711 character set. Recognized properties are:
714 String to be displayed in the modeline when this coding system is
718 End-of-line conversion to be used. It should be one of
721 Automatically detect the end-of-line type (LF, CRLF,
722 or CR). Also generate subsidiary coding systems named
723 `NAME-unix', `NAME-dos', and `NAME-mac', that are
724 identical to this coding system but have an EOL-TYPE
725 value of 'lf, 'crlf, and 'cr, respectively.
727 The end of a line is marked externally using ASCII LF.
728 Since this is also the way that XEmacs represents an
729 end-of-line internally, specifying this option results
730 in no end-of-line conversion. This is the standard
731 format for Unix text files.
733 The end of a line is marked externally using ASCII
734 CRLF. This is the standard format for MS-DOS text
737 The end of a line is marked externally using ASCII CR.
738 This is the standard format for Macintosh text files.
740 Automatically detect the end-of-line type but do not
741 generate subsidiary coding systems. (This value is
742 converted to nil when stored internally, and
743 `coding-system-property' will return nil.)
745 'post-read-conversion
746 Function called after a file has been read in, to perform the
747 decoding. Called with two arguments, BEG and END, denoting
748 a region of the current buffer to be decoded.
750 'pre-write-conversion
751 Function called before a file is written out, to perform the
752 encoding. Called with two arguments, BEG and END, denoting
753 a region of the current buffer to be encoded.
756 The following additional properties are recognized if TYPE is 'iso2022:
762 The character set initially designated to the G0 - G3 registers.
763 The value should be one of
765 -- A charset object (designate that character set)
766 -- nil (do not ever use this register)
767 -- t (no character set is initially designated to
768 the register, but may be later on; this automatically
769 sets the corresponding `force-g*-on-output' property)
775 If non-nil, send an explicit designation sequence on output before
776 using the specified register.
779 If non-nil, use the short forms "ESC $ @", "ESC $ A", and
780 "ESC $ B" on output in place of the full designation sequences
781 "ESC $ ( @", "ESC $ ( A", and "ESC $ ( B".
784 If non-nil, don't designate ASCII to G0 at each end of line on output.
785 Setting this to non-nil also suppresses other state-resetting that
786 normally happens at the end of a line.
789 If non-nil, don't designate ASCII to G0 before control chars on output.
792 If non-nil, use 7-bit environment on output. Otherwise, use 8-bit
796 If non-nil, use locking-shift (SO/SI) instead of single-shift
797 or designation by escape sequence.
800 If non-nil, don't use ISO6429's direction specification.
803 If non-nil, literal control characters that are the same as
804 the beginning of a recognized ISO2022 or ISO6429 escape sequence
805 (in particular, ESC (0x1B), SO (0x0E), SI (0x0F), SS2 (0x8E),
806 SS3 (0x8F), and CSI (0x9B)) are "quoted" with an escape character
807 so that they can be properly distinguished from an escape sequence.
808 (Note that doing this results in a non-portable encoding.) This
809 encoding flag is used for byte-compiled files. Note that ESC
810 is a good choice for a quoting character because there are no
811 escape sequences whose second byte is a character from the Control-0
812 or Control-1 character sets; this is explicitly disallowed by the
815 'input-charset-conversion
816 A list of conversion specifications, specifying conversion of
817 characters in one charset to another when decoding is performed.
818 Each specification is a list of two elements: the source charset,
819 and the destination charset.
821 'output-charset-conversion
822 A list of conversion specifications, specifying conversion of
823 characters in one charset to another when encoding is performed.
824 The form of each specification is the same as for
825 'input-charset-conversion.
828 The following additional properties are recognized (and required)
832 CCL program used for decoding (converting to internal format).
835 CCL program used for encoding (converting to external format).
837 (name, type, doc_string, props))
839 Lisp_Coding_System *codesys;
840 Lisp_Object rest, key, value;
841 enum coding_system_type ty;
842 int need_to_setup_eol_systems = 1;
844 /* Convert type to constant */
845 if (NILP (type) || EQ (type, Qundecided))
846 { ty = CODESYS_AUTODETECT; }
848 else if (EQ (type, Qshift_jis)) { ty = CODESYS_SHIFT_JIS; }
849 else if (EQ (type, Qiso2022)) { ty = CODESYS_ISO2022; }
850 else if (EQ (type, Qbig5)) { ty = CODESYS_BIG5; }
851 else if (EQ (type, Qucs4)) { ty = CODESYS_UCS4; }
852 else if (EQ (type, Qutf8)) { ty = CODESYS_UTF8; }
853 else if (EQ (type, Qccl)) { ty = CODESYS_CCL; }
855 else if (EQ (type, Qno_conversion)) { ty = CODESYS_NO_CONVERSION; }
857 else if (EQ (type, Qinternal)) { ty = CODESYS_INTERNAL; }
860 signal_simple_error ("Invalid coding system type", type);
864 codesys = allocate_coding_system (ty, name);
866 if (NILP (doc_string))
867 doc_string = build_string ("");
869 CHECK_STRING (doc_string);
870 CODING_SYSTEM_DOC_STRING (codesys) = doc_string;
872 EXTERNAL_PROPERTY_LIST_LOOP (rest, key, value, props)
874 if (EQ (key, Qmnemonic))
877 CHECK_STRING (value);
878 CODING_SYSTEM_MNEMONIC (codesys) = value;
881 else if (EQ (key, Qeol_type))
883 need_to_setup_eol_systems = NILP (value);
886 CODING_SYSTEM_EOL_TYPE (codesys) = symbol_to_eol_type (value);
889 else if (EQ (key, Qpost_read_conversion)) CODING_SYSTEM_POST_READ_CONVERSION (codesys) = value;
890 else if (EQ (key, Qpre_write_conversion)) CODING_SYSTEM_PRE_WRITE_CONVERSION (codesys) = value;
892 else if (ty == CODESYS_ISO2022)
894 #define FROB_INITIAL_CHARSET(charset_num) \
895 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, charset_num) = \
896 ((EQ (value, Qt) || EQ (value, Qnil)) ? value : Fget_charset (value))
898 if (EQ (key, Qcharset_g0)) FROB_INITIAL_CHARSET (0);
899 else if (EQ (key, Qcharset_g1)) FROB_INITIAL_CHARSET (1);
900 else if (EQ (key, Qcharset_g2)) FROB_INITIAL_CHARSET (2);
901 else if (EQ (key, Qcharset_g3)) FROB_INITIAL_CHARSET (3);
903 #define FROB_FORCE_CHARSET(charset_num) \
904 CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (codesys, charset_num) = !NILP (value)
906 else if (EQ (key, Qforce_g0_on_output)) FROB_FORCE_CHARSET (0);
907 else if (EQ (key, Qforce_g1_on_output)) FROB_FORCE_CHARSET (1);
908 else if (EQ (key, Qforce_g2_on_output)) FROB_FORCE_CHARSET (2);
909 else if (EQ (key, Qforce_g3_on_output)) FROB_FORCE_CHARSET (3);
911 #define FROB_BOOLEAN_PROPERTY(prop) \
912 CODING_SYSTEM_ISO2022_##prop (codesys) = !NILP (value)
914 else if (EQ (key, Qshort)) FROB_BOOLEAN_PROPERTY (SHORT);
915 else if (EQ (key, Qno_ascii_eol)) FROB_BOOLEAN_PROPERTY (NO_ASCII_EOL);
916 else if (EQ (key, Qno_ascii_cntl)) FROB_BOOLEAN_PROPERTY (NO_ASCII_CNTL);
917 else if (EQ (key, Qseven)) FROB_BOOLEAN_PROPERTY (SEVEN);
918 else if (EQ (key, Qlock_shift)) FROB_BOOLEAN_PROPERTY (LOCK_SHIFT);
919 else if (EQ (key, Qno_iso6429)) FROB_BOOLEAN_PROPERTY (NO_ISO6429);
920 else if (EQ (key, Qescape_quoted)) FROB_BOOLEAN_PROPERTY (ESCAPE_QUOTED);
922 else if (EQ (key, Qinput_charset_conversion))
924 codesys->iso2022.input_conv =
925 Dynarr_new (charset_conversion_spec);
926 parse_charset_conversion_specs (codesys->iso2022.input_conv,
929 else if (EQ (key, Qoutput_charset_conversion))
931 codesys->iso2022.output_conv =
932 Dynarr_new (charset_conversion_spec);
933 parse_charset_conversion_specs (codesys->iso2022.output_conv,
937 signal_simple_error ("Unrecognized property", key);
939 else if (EQ (type, Qccl))
941 if (EQ (key, Qdecode))
943 CHECK_VECTOR (value);
944 CODING_SYSTEM_CCL_DECODE (codesys) = value;
946 else if (EQ (key, Qencode))
948 CHECK_VECTOR (value);
949 CODING_SYSTEM_CCL_ENCODE (codesys) = value;
952 signal_simple_error ("Unrecognized property", key);
956 signal_simple_error ("Unrecognized property", key);
959 if (need_to_setup_eol_systems)
960 setup_eol_coding_systems (codesys);
963 Lisp_Object codesys_obj;
964 XSETCODING_SYSTEM (codesys_obj, codesys);
965 Fputhash (name, codesys_obj, Vcoding_system_hash_table);
970 DEFUN ("copy-coding-system", Fcopy_coding_system, 2, 2, 0, /*
971 Copy OLD-CODING-SYSTEM to NEW-NAME.
972 If NEW-NAME does not name an existing coding system, a new one will
975 (old_coding_system, new_name))
977 Lisp_Object new_coding_system;
978 old_coding_system = Fget_coding_system (old_coding_system);
979 new_coding_system = Ffind_coding_system (new_name);
980 if (NILP (new_coding_system))
982 XSETCODING_SYSTEM (new_coding_system,
983 allocate_coding_system
984 (XCODING_SYSTEM_TYPE (old_coding_system),
986 Fputhash (new_name, new_coding_system, Vcoding_system_hash_table);
990 Lisp_Coding_System *to = XCODING_SYSTEM (new_coding_system);
991 Lisp_Coding_System *from = XCODING_SYSTEM (old_coding_system);
992 memcpy (((char *) to ) + sizeof (to->header),
993 ((char *) from) + sizeof (from->header),
994 sizeof (*from) - sizeof (from->header));
997 return new_coding_system;
1000 DEFUN ("define-coding-system-alias", Fdefine_coding_system_alias, 2, 2, 0, /*
1001 Define symbol ALIAS as an alias for coding system CODING-SYSTEM.
1003 (alias, coding_system))
1005 CHECK_SYMBOL (alias);
1006 if (!NILP (Ffind_coding_system (alias)))
1007 signal_simple_error ("Symbol already names a coding system", alias);
1008 coding_system = Fget_coding_system (coding_system);
1009 Fputhash (alias, coding_system, Vcoding_system_hash_table);
1011 /* Set up aliases for subsidiaries. */
1012 if (XCODING_SYSTEM_EOL_TYPE (coding_system) == EOL_AUTODETECT)
1015 XSETSTRING (str, symbol_name (XSYMBOL (alias)));
1016 #define FROB(type, name) \
1018 Lisp_Object subsidiary = XCODING_SYSTEM_EOL_##type (coding_system); \
1019 if (!NILP (subsidiary)) \
1020 Fdefine_coding_system_alias \
1021 (Fintern (concat2 (str, build_string (name)), Qnil), subsidiary); \
1024 FROB (CRLF, "-dos");
1028 /* FSF return value is a vector of [ALIAS-unix ALIAS-doc ALIAS-mac],
1029 but it doesn't look intentional, so I'd rather return something
1030 meaningful or nothing at all. */
1035 subsidiary_coding_system (Lisp_Object coding_system, enum eol_type type)
1037 Lisp_Coding_System *cs = XCODING_SYSTEM (coding_system);
1038 Lisp_Object new_coding_system;
1040 if (CODING_SYSTEM_EOL_TYPE (cs) != EOL_AUTODETECT)
1041 return coding_system;
1045 case EOL_AUTODETECT: return coding_system;
1046 case EOL_LF: new_coding_system = CODING_SYSTEM_EOL_LF (cs); break;
1047 case EOL_CR: new_coding_system = CODING_SYSTEM_EOL_CR (cs); break;
1048 case EOL_CRLF: new_coding_system = CODING_SYSTEM_EOL_CRLF (cs); break;
1052 return NILP (new_coding_system) ? coding_system : new_coding_system;
1055 DEFUN ("subsidiary-coding-system", Fsubsidiary_coding_system, 2, 2, 0, /*
1056 Return the subsidiary coding system of CODING-SYSTEM with eol type EOL-TYPE.
1058 (coding_system, eol_type))
1060 coding_system = Fget_coding_system (coding_system);
1062 return subsidiary_coding_system (coding_system,
1063 symbol_to_eol_type (eol_type));
1067 /************************************************************************/
1068 /* Coding system accessors */
1069 /************************************************************************/
1071 DEFUN ("coding-system-doc-string", Fcoding_system_doc_string, 1, 1, 0, /*
1072 Return the doc string for CODING-SYSTEM.
1076 coding_system = Fget_coding_system (coding_system);
1077 return XCODING_SYSTEM_DOC_STRING (coding_system);
1080 DEFUN ("coding-system-type", Fcoding_system_type, 1, 1, 0, /*
1081 Return the type of CODING-SYSTEM.
1085 switch (XCODING_SYSTEM_TYPE (Fget_coding_system (coding_system)))
1088 case CODESYS_AUTODETECT: return Qundecided;
1090 case CODESYS_SHIFT_JIS: return Qshift_jis;
1091 case CODESYS_ISO2022: return Qiso2022;
1092 case CODESYS_BIG5: return Qbig5;
1093 case CODESYS_UCS4: return Qucs4;
1094 case CODESYS_UTF8: return Qutf8;
1095 case CODESYS_CCL: return Qccl;
1097 case CODESYS_NO_CONVERSION: return Qno_conversion;
1099 case CODESYS_INTERNAL: return Qinternal;
1106 Lisp_Object coding_system_charset (Lisp_Object coding_system, int gnum)
1109 = XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, gnum);
1111 return CHARSETP (cs) ? XCHARSET_NAME (cs) : Qnil;
1114 DEFUN ("coding-system-charset", Fcoding_system_charset, 2, 2, 0, /*
1115 Return initial charset of CODING-SYSTEM designated to GNUM.
1118 (coding_system, gnum))
1120 coding_system = Fget_coding_system (coding_system);
1123 return coding_system_charset (coding_system, XINT (gnum));
1127 DEFUN ("coding-system-property", Fcoding_system_property, 2, 2, 0, /*
1128 Return the PROP property of CODING-SYSTEM.
1130 (coding_system, prop))
1133 enum coding_system_type type;
1135 coding_system = Fget_coding_system (coding_system);
1136 CHECK_SYMBOL (prop);
1137 type = XCODING_SYSTEM_TYPE (coding_system);
1139 for (i = 0; !ok && i < Dynarr_length (the_codesys_prop_dynarr); i++)
1140 if (EQ (Dynarr_at (the_codesys_prop_dynarr, i).sym, prop))
1143 switch (Dynarr_at (the_codesys_prop_dynarr, i).prop_type)
1145 case CODESYS_PROP_ALL_OK:
1148 case CODESYS_PROP_ISO2022:
1149 if (type != CODESYS_ISO2022)
1151 ("Property only valid in ISO2022 coding systems",
1155 case CODESYS_PROP_CCL:
1156 if (type != CODESYS_CCL)
1158 ("Property only valid in CCL coding systems",
1168 signal_simple_error ("Unrecognized property", prop);
1170 if (EQ (prop, Qname))
1171 return XCODING_SYSTEM_NAME (coding_system);
1172 else if (EQ (prop, Qtype))
1173 return Fcoding_system_type (coding_system);
1174 else if (EQ (prop, Qdoc_string))
1175 return XCODING_SYSTEM_DOC_STRING (coding_system);
1176 else if (EQ (prop, Qmnemonic))
1177 return XCODING_SYSTEM_MNEMONIC (coding_system);
1178 else if (EQ (prop, Qeol_type))
1179 return eol_type_to_symbol (XCODING_SYSTEM_EOL_TYPE (coding_system));
1180 else if (EQ (prop, Qeol_lf))
1181 return XCODING_SYSTEM_EOL_LF (coding_system);
1182 else if (EQ (prop, Qeol_crlf))
1183 return XCODING_SYSTEM_EOL_CRLF (coding_system);
1184 else if (EQ (prop, Qeol_cr))
1185 return XCODING_SYSTEM_EOL_CR (coding_system);
1186 else if (EQ (prop, Qpost_read_conversion))
1187 return XCODING_SYSTEM_POST_READ_CONVERSION (coding_system);
1188 else if (EQ (prop, Qpre_write_conversion))
1189 return XCODING_SYSTEM_PRE_WRITE_CONVERSION (coding_system);
1191 else if (type == CODESYS_ISO2022)
1193 if (EQ (prop, Qcharset_g0))
1194 return coding_system_charset (coding_system, 0);
1195 else if (EQ (prop, Qcharset_g1))
1196 return coding_system_charset (coding_system, 1);
1197 else if (EQ (prop, Qcharset_g2))
1198 return coding_system_charset (coding_system, 2);
1199 else if (EQ (prop, Qcharset_g3))
1200 return coding_system_charset (coding_system, 3);
1202 #define FORCE_CHARSET(charset_num) \
1203 (XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT \
1204 (coding_system, charset_num) ? Qt : Qnil)
1206 else if (EQ (prop, Qforce_g0_on_output)) return FORCE_CHARSET (0);
1207 else if (EQ (prop, Qforce_g1_on_output)) return FORCE_CHARSET (1);
1208 else if (EQ (prop, Qforce_g2_on_output)) return FORCE_CHARSET (2);
1209 else if (EQ (prop, Qforce_g3_on_output)) return FORCE_CHARSET (3);
1211 #define LISP_BOOLEAN(prop) \
1212 (XCODING_SYSTEM_ISO2022_##prop (coding_system) ? Qt : Qnil)
1214 else if (EQ (prop, Qshort)) return LISP_BOOLEAN (SHORT);
1215 else if (EQ (prop, Qno_ascii_eol)) return LISP_BOOLEAN (NO_ASCII_EOL);
1216 else if (EQ (prop, Qno_ascii_cntl)) return LISP_BOOLEAN (NO_ASCII_CNTL);
1217 else if (EQ (prop, Qseven)) return LISP_BOOLEAN (SEVEN);
1218 else if (EQ (prop, Qlock_shift)) return LISP_BOOLEAN (LOCK_SHIFT);
1219 else if (EQ (prop, Qno_iso6429)) return LISP_BOOLEAN (NO_ISO6429);
1220 else if (EQ (prop, Qescape_quoted)) return LISP_BOOLEAN (ESCAPE_QUOTED);
1222 else if (EQ (prop, Qinput_charset_conversion))
1224 unparse_charset_conversion_specs
1225 (XCODING_SYSTEM (coding_system)->iso2022.input_conv);
1226 else if (EQ (prop, Qoutput_charset_conversion))
1228 unparse_charset_conversion_specs
1229 (XCODING_SYSTEM (coding_system)->iso2022.output_conv);
1233 else if (type == CODESYS_CCL)
1235 if (EQ (prop, Qdecode))
1236 return XCODING_SYSTEM_CCL_DECODE (coding_system);
1237 else if (EQ (prop, Qencode))
1238 return XCODING_SYSTEM_CCL_ENCODE (coding_system);
1246 return Qnil; /* not reached */
1250 /************************************************************************/
1251 /* Coding category functions */
1252 /************************************************************************/
1255 decode_coding_category (Lisp_Object symbol)
1259 CHECK_SYMBOL (symbol);
1260 for (i = 0; i <= CODING_CATEGORY_LAST; i++)
1261 if (EQ (coding_category_symbol[i], symbol))
1264 signal_simple_error ("Unrecognized coding category", symbol);
1265 return 0; /* not reached */
1268 DEFUN ("coding-category-list", Fcoding_category_list, 0, 0, 0, /*
1269 Return a list of all recognized coding categories.
1274 Lisp_Object list = Qnil;
1276 for (i = CODING_CATEGORY_LAST; i >= 0; i--)
1277 list = Fcons (coding_category_symbol[i], list);
1281 DEFUN ("set-coding-priority-list", Fset_coding_priority_list, 1, 1, 0, /*
1282 Change the priority order of the coding categories.
1283 LIST should be list of coding categories, in descending order of
1284 priority. Unspecified coding categories will be lower in priority
1285 than all specified ones, in the same relative order they were in
1290 int category_to_priority[CODING_CATEGORY_LAST + 1];
1294 /* First generate a list that maps coding categories to priorities. */
1296 for (i = 0; i <= CODING_CATEGORY_LAST; i++)
1297 category_to_priority[i] = -1;
1299 /* Highest priority comes from the specified list. */
1301 EXTERNAL_LIST_LOOP (rest, list)
1303 int cat = decode_coding_category (XCAR (rest));
1305 if (category_to_priority[cat] >= 0)
1306 signal_simple_error ("Duplicate coding category in list", XCAR (rest));
1307 category_to_priority[cat] = i++;
1310 /* Now go through the existing categories by priority to retrieve
1311 the categories not yet specified and preserve their priority
1313 for (j = 0; j <= CODING_CATEGORY_LAST; j++)
1315 int cat = coding_category_by_priority[j];
1316 if (category_to_priority[cat] < 0)
1317 category_to_priority[cat] = i++;
1320 /* Now we need to construct the inverse of the mapping we just
1323 for (i = 0; i <= CODING_CATEGORY_LAST; i++)
1324 coding_category_by_priority[category_to_priority[i]] = i;
1326 /* Phew! That was confusing. */
1330 DEFUN ("coding-priority-list", Fcoding_priority_list, 0, 0, 0, /*
1331 Return a list of coding categories in descending order of priority.
1336 Lisp_Object list = Qnil;
1338 for (i = CODING_CATEGORY_LAST; i >= 0; i--)
1339 list = Fcons (coding_category_symbol[coding_category_by_priority[i]],
1344 DEFUN ("set-coding-category-system", Fset_coding_category_system, 2, 2, 0, /*
1345 Change the coding system associated with a coding category.
1347 (coding_category, coding_system))
1349 int cat = decode_coding_category (coding_category);
1351 coding_system = Fget_coding_system (coding_system);
1352 coding_category_system[cat] = coding_system;
1356 DEFUN ("coding-category-system", Fcoding_category_system, 1, 1, 0, /*
1357 Return the coding system associated with a coding category.
1361 int cat = decode_coding_category (coding_category);
1362 Lisp_Object sys = coding_category_system[cat];
1365 return XCODING_SYSTEM_NAME (sys);
1370 /************************************************************************/
1371 /* Detecting the encoding of data */
1372 /************************************************************************/
1374 struct detection_state
1376 enum eol_type eol_type;
1412 struct iso2022_decoder iso;
1414 int high_byte_count;
1415 unsigned int saw_single_shift:1;
1428 acceptable_control_char_p (int c)
1432 /* Allow and ignore control characters that you might
1433 reasonably see in a text file */
1438 case 8: /* backspace */
1439 case 11: /* vertical tab */
1440 case 12: /* form feed */
1441 case 26: /* MS-DOS C-z junk */
1442 case 31: /* '^_' -- for info */
1450 mask_has_at_most_one_bit_p (int mask)
1452 /* Perhaps the only thing useful you learn from intensive Microsoft
1453 technical interviews */
1454 return (mask & (mask - 1)) == 0;
1457 static enum eol_type
1458 detect_eol_type (struct detection_state *st, CONST unsigned char *src,
1467 st->eol.just_saw_cr = 1;
1472 if (st->eol.just_saw_cr)
1474 else if (st->eol.seen_anything)
1477 else if (st->eol.just_saw_cr)
1479 st->eol.just_saw_cr = 0;
1481 st->eol.seen_anything = 1;
1484 return EOL_AUTODETECT;
1487 /* Attempt to determine the encoding and EOL type of the given text.
1488 Before calling this function for the first type, you must initialize
1489 st->eol_type as appropriate and initialize st->mask to ~0.
1491 st->eol_type holds the determined EOL type, or EOL_AUTODETECT if
1494 st->mask holds the determined coding category mask, or ~0 if only
1495 ASCII has been seen so far.
1499 0 == st->eol_type is EOL_AUTODETECT and/or more than coding category
1500 is present in st->mask
1501 1 == definitive answers are here for both st->eol_type and st->mask
1505 detect_coding_type (struct detection_state *st, CONST unsigned char *src,
1506 unsigned int n, int just_do_eol)
1510 if (st->eol_type == EOL_AUTODETECT)
1511 st->eol_type = detect_eol_type (st, src, n);
1514 return st->eol_type != EOL_AUTODETECT;
1516 if (!st->seen_non_ascii)
1518 for (; n; n--, src++)
1521 if ((c < 0x20 && !acceptable_control_char_p (c)) || c >= 0x80)
1523 st->seen_non_ascii = 1;
1525 st->shift_jis.mask = ~0;
1529 st->iso2022.mask = ~0;
1539 if (!mask_has_at_most_one_bit_p (st->iso2022.mask))
1540 st->iso2022.mask = detect_coding_iso2022 (st, src, n);
1541 if (!mask_has_at_most_one_bit_p (st->shift_jis.mask))
1542 st->shift_jis.mask = detect_coding_sjis (st, src, n);
1543 if (!mask_has_at_most_one_bit_p (st->big5.mask))
1544 st->big5.mask = detect_coding_big5 (st, src, n);
1545 if (!mask_has_at_most_one_bit_p (st->utf8.mask))
1546 st->utf8.mask = detect_coding_utf8 (st, src, n);
1547 if (!mask_has_at_most_one_bit_p (st->ucs4.mask))
1548 st->ucs4.mask = detect_coding_ucs4 (st, src, n);
1551 = st->iso2022.mask | st->shift_jis.mask | st->big5.mask
1552 | st->utf8.mask | st->ucs4.mask;
1555 int retval = mask_has_at_most_one_bit_p (st->mask);
1556 st->mask |= CODING_CATEGORY_NO_CONVERSION_MASK;
1557 return retval && st->eol_type != EOL_AUTODETECT;
1562 coding_system_from_mask (int mask)
1566 /* If the file was entirely or basically ASCII, use the
1567 default value of `buffer-file-coding-system'. */
1568 Lisp_Object retval =
1569 XBUFFER (Vbuffer_defaults)->buffer_file_coding_system;
1572 retval = Ffind_coding_system (retval);
1576 (Qbad_variable, Qwarning,
1577 "Invalid `default-buffer-file-coding-system', set to nil");
1578 XBUFFER (Vbuffer_defaults)->buffer_file_coding_system = Qnil;
1582 retval = Fget_coding_system (Qraw_text);
1590 mask = postprocess_iso2022_mask (mask);
1592 /* Look through the coding categories by priority and find
1593 the first one that is allowed. */
1594 for (i = 0; i <= CODING_CATEGORY_LAST; i++)
1596 cat = coding_category_by_priority[i];
1597 if ((mask & (1 << cat)) &&
1598 !NILP (coding_category_system[cat]))
1602 return coding_category_system[cat];
1604 return Fget_coding_system (Qraw_text);
1608 /* Given a seekable read stream and potential coding system and EOL type
1609 as specified, do any autodetection that is called for. If the
1610 coding system and/or EOL type are not autodetect, they will be left
1611 alone; but this function will never return an autodetect coding system
1614 This function does not automatically fetch subsidiary coding systems;
1615 that should be unnecessary with the explicit eol-type argument. */
1618 determine_real_coding_system (Lstream *stream, Lisp_Object *codesys_in_out,
1619 enum eol_type *eol_type_in_out)
1621 struct detection_state decst;
1623 if (*eol_type_in_out == EOL_AUTODETECT)
1624 *eol_type_in_out = XCODING_SYSTEM_EOL_TYPE (*codesys_in_out);
1627 decst.eol_type = *eol_type_in_out;
1630 /* If autodetection is called for, do it now. */
1631 if (XCODING_SYSTEM_TYPE (*codesys_in_out) == CODESYS_AUTODETECT ||
1632 *eol_type_in_out == EOL_AUTODETECT)
1634 unsigned char random_buffer[4096];
1636 Lisp_Object coding_system = Qnil;
1638 nread = Lstream_read (stream, random_buffer, sizeof (random_buffer));
1641 unsigned char *cp = random_buffer;
1643 while (cp < random_buffer + nread)
1645 if ((*cp++ == 'c') && (cp < random_buffer + nread) &&
1646 (*cp++ == 'o') && (cp < random_buffer + nread) &&
1647 (*cp++ == 'd') && (cp < random_buffer + nread) &&
1648 (*cp++ == 'i') && (cp < random_buffer + nread) &&
1649 (*cp++ == 'n') && (cp < random_buffer + nread) &&
1650 (*cp++ == 'g') && (cp < random_buffer + nread) &&
1651 (*cp++ == ':') && (cp < random_buffer + nread))
1653 unsigned char coding_system_name[4096 - 6];
1654 unsigned char *np = coding_system_name;
1656 while ( (cp < random_buffer + nread)
1657 && ((*cp == ' ') || (*cp == '\t')) )
1661 while ( (cp < random_buffer + nread) &&
1662 (*cp != ' ') && (*cp != '\t') && (*cp != ';') )
1668 = Ffind_coding_system (intern (coding_system_name));
1672 if (EQ(coding_system, Qnil))
1674 if (detect_coding_type (&decst, random_buffer, nread,
1675 XCODING_SYSTEM_TYPE (*codesys_in_out)
1676 != CODESYS_AUTODETECT))
1678 nread = Lstream_read (stream,
1679 random_buffer, sizeof (random_buffer));
1684 *eol_type_in_out = decst.eol_type;
1685 if (XCODING_SYSTEM_TYPE (*codesys_in_out) == CODESYS_AUTODETECT)
1687 if (EQ(coding_system, Qnil))
1688 *codesys_in_out = coding_system_from_mask (decst.mask);
1690 *codesys_in_out = coding_system;
1693 /* If we absolutely can't determine the EOL type, just assume LF. */
1694 if (*eol_type_in_out == EOL_AUTODETECT)
1695 *eol_type_in_out = EOL_LF;
1697 Lstream_rewind (stream);
1700 DEFUN ("detect-coding-region", Fdetect_coding_region, 2, 3, 0, /*
1701 Detect coding system of the text in the region between START and END.
1702 Returned a list of possible coding systems ordered by priority.
1703 If only ASCII characters are found, it returns 'undecided or one of
1704 its subsidiary coding systems according to a detected end-of-line
1705 type. Optional arg BUFFER defaults to the current buffer.
1707 (start, end, buffer))
1709 Lisp_Object val = Qnil;
1710 struct buffer *buf = decode_buffer (buffer, 0);
1712 Lisp_Object instream, lb_instream;
1713 Lstream *istr, *lb_istr;
1714 struct detection_state decst;
1715 struct gcpro gcpro1, gcpro2;
1717 get_buffer_range_char (buf, start, end, &b, &e, 0);
1718 lb_instream = make_lisp_buffer_input_stream (buf, b, e, 0);
1719 lb_istr = XLSTREAM (lb_instream);
1720 instream = make_encoding_input_stream (lb_istr, Fget_coding_system (Qbinary));
1721 istr = XLSTREAM (instream);
1722 GCPRO2 (instream, lb_instream);
1724 decst.eol_type = EOL_AUTODETECT;
1728 unsigned char random_buffer[4096];
1729 int nread = Lstream_read (istr, random_buffer, sizeof (random_buffer));
1733 if (detect_coding_type (&decst, random_buffer, nread, 0))
1737 if (decst.mask == ~0)
1738 val = subsidiary_coding_system (Fget_coding_system (Qundecided),
1746 decst.mask = postprocess_iso2022_mask (decst.mask);
1748 for (i = CODING_CATEGORY_LAST; i >= 0; i--)
1750 int sys = coding_category_by_priority[i];
1751 if (decst.mask & (1 << sys))
1753 Lisp_Object codesys = coding_category_system[sys];
1754 if (!NILP (codesys))
1755 codesys = subsidiary_coding_system (codesys, decst.eol_type);
1756 val = Fcons (codesys, val);
1760 Lstream_close (istr);
1762 Lstream_delete (istr);
1763 Lstream_delete (lb_istr);
1768 /************************************************************************/
1769 /* Converting to internal Mule format ("decoding") */
1770 /************************************************************************/
1772 /* A decoding stream is a stream used for decoding text (i.e.
1773 converting from some external format to internal format).
1774 The decoding-stream object keeps track of the actual coding
1775 stream, the stream that is at the other end, and data that
1776 needs to be persistent across the lifetime of the stream. */
1778 /* Handle the EOL stuff related to just-read-in character C.
1779 EOL_TYPE is the EOL type of the coding stream.
1780 FLAGS is the current value of FLAGS in the coding stream, and may
1781 be modified by this macro. (The macro only looks at the
1782 CODING_STATE_CR flag.) DST is the Dynarr to which the decoded
1783 bytes are to be written. You need to also define a local goto
1784 label "label_continue_loop" that is at the end of the main
1785 character-reading loop.
1787 If C is a CR character, then this macro handles it entirely and
1788 jumps to label_continue_loop. Otherwise, this macro does not add
1789 anything to DST, and continues normally. You should continue
1790 processing C normally after this macro. */
1792 #define DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst) \
1796 if (eol_type == EOL_CR) \
1797 Dynarr_add (dst, '\n'); \
1798 else if (eol_type != EOL_CRLF || flags & CODING_STATE_CR) \
1799 Dynarr_add (dst, c); \
1801 flags |= CODING_STATE_CR; \
1802 goto label_continue_loop; \
1804 else if (flags & CODING_STATE_CR) \
1805 { /* eol_type == CODING_SYSTEM_EOL_CRLF */ \
1807 Dynarr_add (dst, '\r'); \
1808 flags &= ~CODING_STATE_CR; \
1812 /* C should be a binary character in the range 0 - 255; convert
1813 to internal format and add to Dynarr DST. */
1816 #define DECODE_ADD_BINARY_CHAR(c, dst) \
1818 if (BYTE_ASCII_P (c)) \
1819 Dynarr_add (dst, c); \
1822 Dynarr_add (dst, (c >> 6) | 0xc0); \
1823 Dynarr_add (dst, (c & 0x3f) | 0x80); \
1828 DECODE_ADD_UCS_CHAR(Emchar c, unsigned_char_dynarr* dst)
1832 Dynarr_add (dst, c);
1834 else if ( c <= 0x7ff )
1836 Dynarr_add (dst, (c >> 6) | 0xc0);
1837 Dynarr_add (dst, (c & 0x3f) | 0x80);
1839 else if ( c <= 0xffff )
1841 Dynarr_add (dst, (c >> 12) | 0xe0);
1842 Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80);
1843 Dynarr_add (dst, (c & 0x3f) | 0x80);
1845 else if ( c <= 0x1fffff )
1847 Dynarr_add (dst, (c >> 18) | 0xf0);
1848 Dynarr_add (dst, ((c >> 12) & 0x3f) | 0x80);
1849 Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80);
1850 Dynarr_add (dst, (c & 0x3f) | 0x80);
1852 else if ( c <= 0x3ffffff )
1854 Dynarr_add (dst, (c >> 24) | 0xf8);
1855 Dynarr_add (dst, ((c >> 18) & 0x3f) | 0x80);
1856 Dynarr_add (dst, ((c >> 12) & 0x3f) | 0x80);
1857 Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80);
1858 Dynarr_add (dst, (c & 0x3f) | 0x80);
1862 Dynarr_add (dst, (c >> 30) | 0xfc);
1863 Dynarr_add (dst, ((c >> 24) & 0x3f) | 0x80);
1864 Dynarr_add (dst, ((c >> 18) & 0x3f) | 0x80);
1865 Dynarr_add (dst, ((c >> 12) & 0x3f) | 0x80);
1866 Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80);
1867 Dynarr_add (dst, (c & 0x3f) | 0x80);
1871 #define DECODE_ADD_BINARY_CHAR(c, dst) \
1873 if (BYTE_ASCII_P (c)) \
1874 Dynarr_add (dst, c); \
1875 else if (BYTE_C1_P (c)) \
1877 Dynarr_add (dst, LEADING_BYTE_CONTROL_1); \
1878 Dynarr_add (dst, c + 0x20); \
1882 Dynarr_add (dst, LEADING_BYTE_LATIN_ISO8859_1); \
1883 Dynarr_add (dst, c); \
1888 #define DECODE_OUTPUT_PARTIAL_CHAR(ch) \
1892 DECODE_ADD_BINARY_CHAR (ch, dst); \
1897 #define DECODE_HANDLE_END_OF_CONVERSION(flags, ch, dst) \
1899 if (flags & CODING_STATE_END) \
1901 DECODE_OUTPUT_PARTIAL_CHAR (ch); \
1902 if (flags & CODING_STATE_CR) \
1903 Dynarr_add (dst, '\r'); \
1907 #define DECODING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, decoding)
1909 struct decoding_stream
1911 /* Coding system that governs the conversion. */
1912 Lisp_Coding_System *codesys;
1914 /* Stream that we read the encoded data from or
1915 write the decoded data to. */
1918 /* If we are reading, then we can return only a fixed amount of
1919 data, so if the conversion resulted in too much data, we store it
1920 here for retrieval the next time around. */
1921 unsigned_char_dynarr *runoff;
1923 /* FLAGS holds flags indicating the current state of the decoding.
1924 Some of these flags are dependent on the coding system. */
1927 /* CH holds a partially built-up character. Since we only deal
1928 with one- and two-byte characters at the moment, we only use
1929 this to store the first byte of a two-byte character. */
1932 /* EOL_TYPE specifies the type of end-of-line conversion that
1933 currently applies. We need to keep this separate from the
1934 EOL type stored in CODESYS because the latter might indicate
1935 automatic EOL-type detection while the former will always
1936 indicate a particular EOL type. */
1937 enum eol_type eol_type;
1939 /* Additional ISO2022 information. We define the structure above
1940 because it's also needed by the detection routines. */
1941 struct iso2022_decoder iso2022;
1943 /* Additional information (the state of the running CCL program)
1944 used by the CCL decoder. */
1945 struct ccl_program ccl;
1947 /* counter for UTF-8 or UCS-4 */
1948 unsigned char counter;
1950 struct detection_state decst;
1953 static int decoding_reader (Lstream *stream, unsigned char *data, size_t size);
1954 static int decoding_writer (Lstream *stream, CONST unsigned char *data, size_t size);
1955 static int decoding_rewinder (Lstream *stream);
1956 static int decoding_seekable_p (Lstream *stream);
1957 static int decoding_flusher (Lstream *stream);
1958 static int decoding_closer (Lstream *stream);
1960 static Lisp_Object decoding_marker (Lisp_Object stream,
1961 void (*markobj) (Lisp_Object));
1963 DEFINE_LSTREAM_IMPLEMENTATION ("decoding", lstream_decoding,
1964 sizeof (struct decoding_stream));
1967 decoding_marker (Lisp_Object stream, void (*markobj) (Lisp_Object))
1969 Lstream *str = DECODING_STREAM_DATA (XLSTREAM (stream))->other_end;
1970 Lisp_Object str_obj;
1972 /* We do not need to mark the coding systems or charsets stored
1973 within the stream because they are stored in a global list
1974 and automatically marked. */
1976 XSETLSTREAM (str_obj, str);
1978 if (str->imp->marker)
1979 return (str->imp->marker) (str_obj, markobj);
1984 /* Read SIZE bytes of data and store it into DATA. We are a decoding stream
1985 so we read data from the other end, decode it, and store it into DATA. */
1988 decoding_reader (Lstream *stream, unsigned char *data, size_t size)
1990 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
1991 unsigned char *orig_data = data;
1993 int error_occurred = 0;
1995 /* We need to interface to mule_decode(), which expects to take some
1996 amount of data and store the result into a Dynarr. We have
1997 mule_decode() store into str->runoff, and take data from there
2000 /* We loop until we have enough data, reading chunks from the other
2001 end and decoding it. */
2004 /* Take data from the runoff if we can. Make sure to take at
2005 most SIZE bytes, and delete the data from the runoff. */
2006 if (Dynarr_length (str->runoff) > 0)
2008 size_t chunk = min (size, (size_t) Dynarr_length (str->runoff));
2009 memcpy (data, Dynarr_atp (str->runoff, 0), chunk);
2010 Dynarr_delete_many (str->runoff, 0, chunk);
2016 break; /* No more room for data */
2018 if (str->flags & CODING_STATE_END)
2019 /* This means that on the previous iteration, we hit the EOF on
2020 the other end. We loop once more so that mule_decode() can
2021 output any final stuff it may be holding, or any "go back
2022 to a sane state" escape sequences. (This latter makes sense
2023 during encoding.) */
2026 /* Exhausted the runoff, so get some more. DATA has at least
2027 SIZE bytes left of storage in it, so it's OK to read directly
2028 into it. (We'll be overwriting above, after we've decoded it
2029 into the runoff.) */
2030 read_size = Lstream_read (str->other_end, data, size);
2037 /* There might be some more end data produced in the translation.
2038 See the comment above. */
2039 str->flags |= CODING_STATE_END;
2040 mule_decode (stream, data, str->runoff, read_size);
2043 if (data - orig_data == 0)
2044 return error_occurred ? -1 : 0;
2046 return data - orig_data;
2050 decoding_writer (Lstream *stream, CONST unsigned char *data, size_t size)
2052 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
2055 /* Decode all our data into the runoff, and then attempt to write
2056 it all out to the other end. Remove whatever chunk we succeeded
2058 mule_decode (stream, data, str->runoff, size);
2059 retval = Lstream_write (str->other_end, Dynarr_atp (str->runoff, 0),
2060 Dynarr_length (str->runoff));
2062 Dynarr_delete_many (str->runoff, 0, retval);
2063 /* Do NOT return retval. The return value indicates how much
2064 of the incoming data was written, not how many bytes were
2070 reset_decoding_stream (struct decoding_stream *str)
2073 if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_ISO2022)
2075 Lisp_Object coding_system;
2076 XSETCODING_SYSTEM (coding_system, str->codesys);
2077 reset_iso2022 (coding_system, &str->iso2022);
2079 else if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_CCL)
2081 setup_ccl_program (&str->ccl, CODING_SYSTEM_CCL_DECODE (str->codesys));
2085 str->flags = str->ch = 0;
2089 decoding_rewinder (Lstream *stream)
2091 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
2092 reset_decoding_stream (str);
2093 Dynarr_reset (str->runoff);
2094 return Lstream_rewind (str->other_end);
2098 decoding_seekable_p (Lstream *stream)
2100 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
2101 return Lstream_seekable_p (str->other_end);
2105 decoding_flusher (Lstream *stream)
2107 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
2108 return Lstream_flush (str->other_end);
2112 decoding_closer (Lstream *stream)
2114 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
2115 if (stream->flags & LSTREAM_FL_WRITE)
2117 str->flags |= CODING_STATE_END;
2118 decoding_writer (stream, 0, 0);
2120 Dynarr_free (str->runoff);
2122 #ifdef ENABLE_COMPOSITE_CHARS
2123 if (str->iso2022.composite_chars)
2124 Dynarr_free (str->iso2022.composite_chars);
2127 return Lstream_close (str->other_end);
2131 decoding_stream_coding_system (Lstream *stream)
2133 Lisp_Object coding_system;
2134 struct decoding_stream *str = DECODING_STREAM_DATA (stream);
2136 XSETCODING_SYSTEM (coding_system, str->codesys);
2137 return subsidiary_coding_system (coding_system, str->eol_type);
2141 set_decoding_stream_coding_system (Lstream *lstr, Lisp_Object codesys)
2143 Lisp_Coding_System *cs = XCODING_SYSTEM (codesys);
2144 struct decoding_stream *str = DECODING_STREAM_DATA (lstr);
2146 if (CODING_SYSTEM_EOL_TYPE (cs) != EOL_AUTODETECT)
2147 str->eol_type = CODING_SYSTEM_EOL_TYPE (cs);
2148 reset_decoding_stream (str);
2151 /* WARNING WARNING WARNING WARNING!!!!! If you open up a decoding
2152 stream for writing, no automatic code detection will be performed.
2153 The reason for this is that automatic code detection requires a
2154 seekable input. Things will also fail if you open a decoding
2155 stream for reading using a non-fully-specified coding system and
2156 a non-seekable input stream. */
2159 make_decoding_stream_1 (Lstream *stream, Lisp_Object codesys,
2162 Lstream *lstr = Lstream_new (lstream_decoding, mode);
2163 struct decoding_stream *str = DECODING_STREAM_DATA (lstr);
2167 str->other_end = stream;
2168 str->runoff = (unsigned_char_dynarr *) Dynarr_new (unsigned_char);
2169 str->eol_type = EOL_AUTODETECT;
2170 if (!strcmp (mode, "r")
2171 && Lstream_seekable_p (stream))
2172 /* We can determine the coding system now. */
2173 determine_real_coding_system (stream, &codesys, &str->eol_type);
2174 set_decoding_stream_coding_system (lstr, codesys);
2175 str->decst.eol_type = str->eol_type;
2176 str->decst.mask = ~0;
2177 XSETLSTREAM (obj, lstr);
2182 make_decoding_input_stream (Lstream *stream, Lisp_Object codesys)
2184 return make_decoding_stream_1 (stream, codesys, "r");
2188 make_decoding_output_stream (Lstream *stream, Lisp_Object codesys)
2190 return make_decoding_stream_1 (stream, codesys, "w");
2193 /* Note: the decode_coding_* functions all take the same
2194 arguments as mule_decode(), which is to say some SRC data of
2195 size N, which is to be stored into dynamic array DST.
2196 DECODING is the stream within which the decoding is
2197 taking place, but no data is actually read from or
2198 written to that stream; that is handled in decoding_reader()
2199 or decoding_writer(). This allows the same functions to
2200 be used for both reading and writing. */
2203 mule_decode (Lstream *decoding, CONST unsigned char *src,
2204 unsigned_char_dynarr *dst, unsigned int n)
2206 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
2208 /* If necessary, do encoding-detection now. We do this when
2209 we're a writing stream or a non-seekable reading stream,
2210 meaning that we can't just process the whole input,
2211 rewind, and start over. */
2213 if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_AUTODETECT ||
2214 str->eol_type == EOL_AUTODETECT)
2216 Lisp_Object codesys;
2218 XSETCODING_SYSTEM (codesys, str->codesys);
2219 detect_coding_type (&str->decst, src, n,
2220 CODING_SYSTEM_TYPE (str->codesys) !=
2221 CODESYS_AUTODETECT);
2222 if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_AUTODETECT &&
2223 str->decst.mask != ~0)
2224 /* #### This is cheesy. What we really ought to do is
2225 buffer up a certain amount of data so as to get a
2226 less random result. */
2227 codesys = coding_system_from_mask (str->decst.mask);
2228 str->eol_type = str->decst.eol_type;
2229 if (XCODING_SYSTEM (codesys) != str->codesys)
2231 /* Preserve the CODING_STATE_END flag in case it was set.
2232 If we erase it, bad things might happen. */
2233 int was_end = str->flags & CODING_STATE_END;
2234 set_decoding_stream_coding_system (decoding, codesys);
2236 str->flags |= CODING_STATE_END;
2240 switch (CODING_SYSTEM_TYPE (str->codesys))
2243 case CODESYS_INTERNAL:
2244 Dynarr_add_many (dst, src, n);
2247 case CODESYS_AUTODETECT:
2248 /* If we got this far and still haven't decided on the coding
2249 system, then do no conversion. */
2250 case CODESYS_NO_CONVERSION:
2251 decode_coding_no_conversion (decoding, src, dst, n);
2254 case CODESYS_SHIFT_JIS:
2255 decode_coding_sjis (decoding, src, dst, n);
2258 decode_coding_big5 (decoding, src, dst, n);
2261 decode_coding_ucs4 (decoding, src, dst, n);
2264 decode_coding_utf8 (decoding, src, dst, n);
2267 str->ccl.last_block = str->flags & CODING_STATE_END;
2268 ccl_driver (&str->ccl, src, dst, n, 0, CCL_MODE_DECODING);
2270 case CODESYS_ISO2022:
2271 decode_coding_iso2022 (decoding, src, dst, n);
2279 DEFUN ("decode-coding-region", Fdecode_coding_region, 3, 4, 0, /*
2280 Decode the text between START and END which is encoded in CODING-SYSTEM.
2281 This is useful if you've read in encoded text from a file without decoding
2282 it (e.g. you read in a JIS-formatted file but used the `binary' or
2283 `no-conversion' coding system, so that it shows up as "^[$B!<!+^[(B").
2284 Return length of decoded text.
2285 BUFFER defaults to the current buffer if unspecified.
2287 (start, end, coding_system, buffer))
2290 struct buffer *buf = decode_buffer (buffer, 0);
2291 Lisp_Object instream, lb_outstream, de_outstream, outstream;
2292 Lstream *istr, *ostr;
2293 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
2295 get_buffer_range_char (buf, start, end, &b, &e, 0);
2297 barf_if_buffer_read_only (buf, b, e);
2299 coding_system = Fget_coding_system (coding_system);
2300 instream = make_lisp_buffer_input_stream (buf, b, e, 0);
2301 lb_outstream = make_lisp_buffer_output_stream (buf, b, 0);
2302 de_outstream = make_decoding_output_stream (XLSTREAM (lb_outstream),
2304 outstream = make_encoding_output_stream (XLSTREAM (de_outstream),
2305 Fget_coding_system (Qbinary));
2306 istr = XLSTREAM (instream);
2307 ostr = XLSTREAM (outstream);
2308 GCPRO4 (instream, lb_outstream, de_outstream, outstream);
2310 /* The chain of streams looks like this:
2312 [BUFFER] <----- send through
2313 ------> [ENCODE AS BINARY]
2314 ------> [DECODE AS SPECIFIED]
2320 char tempbuf[1024]; /* some random amount */
2321 Bufpos newpos, even_newer_pos;
2322 Bufpos oldpos = lisp_buffer_stream_startpos (istr);
2323 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
2327 newpos = lisp_buffer_stream_startpos (istr);
2328 Lstream_write (ostr, tempbuf, size_in_bytes);
2329 even_newer_pos = lisp_buffer_stream_startpos (istr);
2330 buffer_delete_range (buf, even_newer_pos - (newpos - oldpos),
2333 Lstream_close (istr);
2334 Lstream_close (ostr);
2336 Lstream_delete (istr);
2337 Lstream_delete (ostr);
2338 Lstream_delete (XLSTREAM (de_outstream));
2339 Lstream_delete (XLSTREAM (lb_outstream));
2344 /************************************************************************/
2345 /* Converting to an external encoding ("encoding") */
2346 /************************************************************************/
2348 /* An encoding stream is an output stream. When you create the
2349 stream, you specify the coding system that governs the encoding
2350 and another stream that the resulting encoded data is to be
2351 sent to, and then start sending data to it. */
2353 #define ENCODING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, encoding)
2355 struct encoding_stream
2357 /* Coding system that governs the conversion. */
2358 Lisp_Coding_System *codesys;
2360 /* Stream that we read the encoded data from or
2361 write the decoded data to. */
2364 /* If we are reading, then we can return only a fixed amount of
2365 data, so if the conversion resulted in too much data, we store it
2366 here for retrieval the next time around. */
2367 unsigned_char_dynarr *runoff;
2369 /* FLAGS holds flags indicating the current state of the encoding.
2370 Some of these flags are dependent on the coding system. */
2373 /* CH holds a partially built-up character. Since we only deal
2374 with one- and two-byte characters at the moment, we only use
2375 this to store the first byte of a two-byte character. */
2378 /* Additional information used by the ISO2022 encoder. */
2381 /* CHARSET holds the character sets currently assigned to the G0
2382 through G3 registers. It is initialized from the array
2383 INITIAL_CHARSET in CODESYS. */
2384 Lisp_Object charset[4];
2386 /* Which registers are currently invoked into the left (GL) and
2387 right (GR) halves of the 8-bit encoding space? */
2388 int register_left, register_right;
2390 /* Whether we need to explicitly designate the charset in the
2391 G? register before using it. It is initialized from the
2392 array FORCE_CHARSET_ON_OUTPUT in CODESYS. */
2393 unsigned char force_charset_on_output[4];
2395 /* Other state variables that need to be preserved across
2397 Lisp_Object current_charset;
2399 int current_char_boundary;
2402 void (*encode_char) (struct encoding_stream *str, Emchar c,
2403 unsigned_char_dynarr *dst, unsigned int *flags);
2404 void (*finish) (struct encoding_stream *str,
2405 unsigned_char_dynarr *dst, unsigned int *flags);
2407 /* Additional information (the state of the running CCL program)
2408 used by the CCL encoder. */
2409 struct ccl_program ccl;
2413 static int encoding_reader (Lstream *stream, unsigned char *data, size_t size);
2414 static int encoding_writer (Lstream *stream, CONST unsigned char *data,
2416 static int encoding_rewinder (Lstream *stream);
2417 static int encoding_seekable_p (Lstream *stream);
2418 static int encoding_flusher (Lstream *stream);
2419 static int encoding_closer (Lstream *stream);
2421 static Lisp_Object encoding_marker (Lisp_Object stream,
2422 void (*markobj) (Lisp_Object));
2424 DEFINE_LSTREAM_IMPLEMENTATION ("encoding", lstream_encoding,
2425 sizeof (struct encoding_stream));
2428 encoding_marker (Lisp_Object stream, void (*markobj) (Lisp_Object))
2430 Lstream *str = ENCODING_STREAM_DATA (XLSTREAM (stream))->other_end;
2431 Lisp_Object str_obj;
2433 /* We do not need to mark the coding systems or charsets stored
2434 within the stream because they are stored in a global list
2435 and automatically marked. */
2437 XSETLSTREAM (str_obj, str);
2439 if (str->imp->marker)
2440 return (str->imp->marker) (str_obj, markobj);
2445 /* Read SIZE bytes of data and store it into DATA. We are a encoding stream
2446 so we read data from the other end, encode it, and store it into DATA. */
2449 encoding_reader (Lstream *stream, unsigned char *data, size_t size)
2451 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2452 unsigned char *orig_data = data;
2454 int error_occurred = 0;
2456 /* We need to interface to mule_encode(), which expects to take some
2457 amount of data and store the result into a Dynarr. We have
2458 mule_encode() store into str->runoff, and take data from there
2461 /* We loop until we have enough data, reading chunks from the other
2462 end and encoding it. */
2465 /* Take data from the runoff if we can. Make sure to take at
2466 most SIZE bytes, and delete the data from the runoff. */
2467 if (Dynarr_length (str->runoff) > 0)
2469 int chunk = min ((int) size, Dynarr_length (str->runoff));
2470 memcpy (data, Dynarr_atp (str->runoff, 0), chunk);
2471 Dynarr_delete_many (str->runoff, 0, chunk);
2477 break; /* No more room for data */
2479 if (str->flags & CODING_STATE_END)
2480 /* This means that on the previous iteration, we hit the EOF on
2481 the other end. We loop once more so that mule_encode() can
2482 output any final stuff it may be holding, or any "go back
2483 to a sane state" escape sequences. (This latter makes sense
2484 during encoding.) */
2487 /* Exhausted the runoff, so get some more. DATA at least SIZE bytes
2488 left of storage in it, so it's OK to read directly into it.
2489 (We'll be overwriting above, after we've encoded it into the
2491 read_size = Lstream_read (str->other_end, data, size);
2498 /* There might be some more end data produced in the translation.
2499 See the comment above. */
2500 str->flags |= CODING_STATE_END;
2501 mule_encode (stream, data, str->runoff, read_size);
2504 if (data == orig_data)
2505 return error_occurred ? -1 : 0;
2507 return data - orig_data;
2511 encoding_writer (Lstream *stream, CONST unsigned char *data, size_t size)
2513 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2516 /* Encode all our data into the runoff, and then attempt to write
2517 it all out to the other end. Remove whatever chunk we succeeded
2519 mule_encode (stream, data, str->runoff, size);
2520 retval = Lstream_write (str->other_end, Dynarr_atp (str->runoff, 0),
2521 Dynarr_length (str->runoff));
2523 Dynarr_delete_many (str->runoff, 0, retval);
2524 /* Do NOT return retval. The return value indicates how much
2525 of the incoming data was written, not how many bytes were
2531 reset_encoding_stream (struct encoding_stream *str)
2534 switch (CODING_SYSTEM_TYPE (str->codesys))
2536 case CODESYS_ISO2022:
2540 str->encode_char = &char_encode_iso2022;
2541 str->finish = &char_finish_iso2022;
2542 for (i = 0; i < 4; i++)
2544 str->iso2022.charset[i] =
2545 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (str->codesys, i);
2546 str->iso2022.force_charset_on_output[i] =
2547 CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (str->codesys, i);
2549 str->iso2022.register_left = 0;
2550 str->iso2022.register_right = 1;
2551 str->iso2022.current_charset = Qnil;
2552 str->iso2022.current_half = 0;
2556 setup_ccl_program (&str->ccl, CODING_SYSTEM_CCL_ENCODE (str->codesys));
2559 str->encode_char = &char_encode_utf8;
2560 str->finish = &char_finish_utf8;
2562 str->encode_char = &char_encode_ucs4;
2563 str->finish = &char_finish_ucs4;
2564 case CODESYS_SHIFT_JIS:
2565 str->encode_char = &char_encode_shift_jis;
2566 str->finish = &char_finish_shift_jis;
2571 str->iso2022.current_char_boundary = 0;
2572 str->flags = str->ch = 0;
2576 encoding_rewinder (Lstream *stream)
2578 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2579 reset_encoding_stream (str);
2580 Dynarr_reset (str->runoff);
2581 return Lstream_rewind (str->other_end);
2585 encoding_seekable_p (Lstream *stream)
2587 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2588 return Lstream_seekable_p (str->other_end);
2592 encoding_flusher (Lstream *stream)
2594 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2595 return Lstream_flush (str->other_end);
2599 encoding_closer (Lstream *stream)
2601 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2602 if (stream->flags & LSTREAM_FL_WRITE)
2604 str->flags |= CODING_STATE_END;
2605 encoding_writer (stream, 0, 0);
2607 Dynarr_free (str->runoff);
2608 return Lstream_close (str->other_end);
2612 encoding_stream_coding_system (Lstream *stream)
2614 Lisp_Object coding_system;
2615 struct encoding_stream *str = ENCODING_STREAM_DATA (stream);
2617 XSETCODING_SYSTEM (coding_system, str->codesys);
2618 return coding_system;
2622 set_encoding_stream_coding_system (Lstream *lstr, Lisp_Object codesys)
2624 Lisp_Coding_System *cs = XCODING_SYSTEM (codesys);
2625 struct encoding_stream *str = ENCODING_STREAM_DATA (lstr);
2627 reset_encoding_stream (str);
2631 make_encoding_stream_1 (Lstream *stream, Lisp_Object codesys,
2634 Lstream *lstr = Lstream_new (lstream_encoding, mode);
2635 struct encoding_stream *str = ENCODING_STREAM_DATA (lstr);
2639 str->runoff = Dynarr_new (unsigned_char);
2640 str->other_end = stream;
2641 set_encoding_stream_coding_system (lstr, codesys);
2642 XSETLSTREAM (obj, lstr);
2647 make_encoding_input_stream (Lstream *stream, Lisp_Object codesys)
2649 return make_encoding_stream_1 (stream, codesys, "r");
2653 make_encoding_output_stream (Lstream *stream, Lisp_Object codesys)
2655 return make_encoding_stream_1 (stream, codesys, "w");
2658 /* Convert N bytes of internally-formatted data stored in SRC to an
2659 external format, according to the encoding stream ENCODING.
2660 Store the encoded data into DST. */
2663 mule_encode (Lstream *encoding, CONST unsigned char *src,
2664 unsigned_char_dynarr *dst, unsigned int n)
2666 struct encoding_stream *str = ENCODING_STREAM_DATA (encoding);
2668 switch (CODING_SYSTEM_TYPE (str->codesys))
2671 case CODESYS_INTERNAL:
2672 Dynarr_add_many (dst, src, n);
2675 case CODESYS_AUTODETECT:
2676 /* If we got this far and still haven't decided on the coding
2677 system, then do no conversion. */
2678 case CODESYS_NO_CONVERSION:
2679 encode_coding_no_conversion (encoding, src, dst, n);
2683 encode_coding_big5 (encoding, src, dst, n);
2686 str->ccl.last_block = str->flags & CODING_STATE_END;
2687 ccl_driver (&str->ccl, src, dst, n, 0, CCL_MODE_ENCODING);
2691 text_encode_generic (encoding, src, dst, n);
2695 DEFUN ("encode-coding-region", Fencode_coding_region, 3, 4, 0, /*
2696 Encode the text between START and END using CODING-SYSTEM.
2697 This will, for example, convert Japanese characters into stuff such as
2698 "^[$B!<!+^[(B" if you use the JIS encoding. Return length of encoded
2699 text. BUFFER defaults to the current buffer if unspecified.
2701 (start, end, coding_system, buffer))
2704 struct buffer *buf = decode_buffer (buffer, 0);
2705 Lisp_Object instream, lb_outstream, de_outstream, outstream;
2706 Lstream *istr, *ostr;
2707 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
2709 get_buffer_range_char (buf, start, end, &b, &e, 0);
2711 barf_if_buffer_read_only (buf, b, e);
2713 coding_system = Fget_coding_system (coding_system);
2714 instream = make_lisp_buffer_input_stream (buf, b, e, 0);
2715 lb_outstream = make_lisp_buffer_output_stream (buf, b, 0);
2716 de_outstream = make_decoding_output_stream (XLSTREAM (lb_outstream),
2717 Fget_coding_system (Qbinary));
2718 outstream = make_encoding_output_stream (XLSTREAM (de_outstream),
2720 istr = XLSTREAM (instream);
2721 ostr = XLSTREAM (outstream);
2722 GCPRO4 (instream, outstream, de_outstream, lb_outstream);
2723 /* The chain of streams looks like this:
2725 [BUFFER] <----- send through
2726 ------> [ENCODE AS SPECIFIED]
2727 ------> [DECODE AS BINARY]
2732 char tempbuf[1024]; /* some random amount */
2733 Bufpos newpos, even_newer_pos;
2734 Bufpos oldpos = lisp_buffer_stream_startpos (istr);
2735 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
2739 newpos = lisp_buffer_stream_startpos (istr);
2740 Lstream_write (ostr, tempbuf, size_in_bytes);
2741 even_newer_pos = lisp_buffer_stream_startpos (istr);
2742 buffer_delete_range (buf, even_newer_pos - (newpos - oldpos),
2748 lisp_buffer_stream_startpos (XLSTREAM (instream)) - b;
2749 Lstream_close (istr);
2750 Lstream_close (ostr);
2752 Lstream_delete (istr);
2753 Lstream_delete (ostr);
2754 Lstream_delete (XLSTREAM (de_outstream));
2755 Lstream_delete (XLSTREAM (lb_outstream));
2756 return make_int (retlen);
2763 text_encode_generic (Lstream *encoding, CONST unsigned char *src,
2764 unsigned_char_dynarr *dst, unsigned int n)
2767 unsigned char char_boundary;
2768 struct encoding_stream *str = ENCODING_STREAM_DATA (encoding);
2769 unsigned int flags = str->flags;
2770 Emchar ch = str->ch;
2772 char_boundary = str->iso2022.current_char_boundary;
2778 if (char_boundary == 0)
2806 (*str->encode_char) (str, c, dst, &flags);
2808 else if (char_boundary == 1)
2810 (*str->encode_char) (str, (ch << 6) | (c & 0x3f), dst, &flags);
2816 ch = (ch << 6) | (c & 0x3f);
2821 if ((char_boundary == 0) && (flags & CODING_STATE_END))
2823 (*str->finish) (str, dst, &flags);
2828 str->iso2022.current_char_boundary = char_boundary;
2832 /************************************************************************/
2833 /* Shift-JIS methods */
2834 /************************************************************************/
2836 /* Shift-JIS is a coding system encoding three character sets: ASCII, right
2837 half of JISX0201-Kana, and JISX0208. An ASCII character is encoded
2838 as is. A character of JISX0201-Kana (DIMENSION1_CHARS94 character set) is
2839 encoded by "position-code + 0x80". A character of JISX0208
2840 (DIMENSION2_CHARS94 character set) is encoded in 2-byte but two
2841 position-codes are divided and shifted so that it fit in the range
2844 --- CODE RANGE of Shift-JIS ---
2845 (character set) (range)
2847 JISX0201-Kana 0xA0 .. 0xDF
2848 JISX0208 (1st byte) 0x80 .. 0x9F and 0xE0 .. 0xEF
2849 (2nd byte) 0x40 .. 0x7E and 0x80 .. 0xFC
2850 -------------------------------
2854 /* Is this the first byte of a Shift-JIS two-byte char? */
2856 #define BYTE_SJIS_TWO_BYTE_1_P(c) \
2857 (((c) >= 0x81 && (c) <= 0x9F) || ((c) >= 0xE0 && (c) <= 0xEF))
2859 /* Is this the second byte of a Shift-JIS two-byte char? */
2861 #define BYTE_SJIS_TWO_BYTE_2_P(c) \
2862 (((c) >= 0x40 && (c) <= 0x7E) || ((c) >= 0x80 && (c) <= 0xFC))
2864 #define BYTE_SJIS_KATAKANA_P(c) \
2865 ((c) >= 0xA1 && (c) <= 0xDF)
2868 detect_coding_sjis (struct detection_state *st, CONST unsigned char *src,
2876 if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
2878 if (st->shift_jis.in_second_byte)
2880 st->shift_jis.in_second_byte = 0;
2884 else if ((c >= 0x80 && c < 0xA0) || c >= 0xE0)
2885 st->shift_jis.in_second_byte = 1;
2887 return CODING_CATEGORY_SHIFT_JIS_MASK;
2890 /* Convert Shift-JIS data to internal format. */
2893 decode_coding_sjis (Lstream *decoding, CONST unsigned char *src,
2894 unsigned_char_dynarr *dst, unsigned int n)
2897 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
2898 unsigned int flags = str->flags;
2899 unsigned int ch = str->ch;
2900 eol_type_t eol_type = str->eol_type;
2908 /* Previous character was first byte of Shift-JIS Kanji char. */
2909 if (BYTE_SJIS_TWO_BYTE_2_P (c))
2911 unsigned char e1, e2;
2913 DECODE_SJIS (ch, c, e1, e2);
2915 DECODE_ADD_UCS_CHAR(MAKE_CHAR(Vcharset_japanese_jisx0208,
2919 Dynarr_add (dst, LEADING_BYTE_JAPANESE_JISX0208);
2920 Dynarr_add (dst, e1);
2921 Dynarr_add (dst, e2);
2926 DECODE_ADD_BINARY_CHAR (ch, dst);
2927 DECODE_ADD_BINARY_CHAR (c, dst);
2933 DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst);
2934 if (BYTE_SJIS_TWO_BYTE_1_P (c))
2936 else if (BYTE_SJIS_KATAKANA_P (c))
2939 DECODE_ADD_UCS_CHAR(MAKE_CHAR(Vcharset_katakana_jisx0201,
2942 Dynarr_add (dst, LEADING_BYTE_KATAKANA_JISX0201);
2943 Dynarr_add (dst, c);
2948 DECODE_ADD_UCS_CHAR(MAKE_CHAR(Vcharset_latin_jisx0201,
2952 DECODE_ADD_BINARY_CHAR (c, dst);
2954 label_continue_loop:;
2957 DECODE_HANDLE_END_OF_CONVERSION (flags, ch, dst);
2963 /* Convert internal character representation to Shift_JIS. */
2966 char_encode_shift_jis (struct encoding_stream *str, Emchar ch,
2967 unsigned_char_dynarr *dst, unsigned int *flags)
2969 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys);
2973 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
2974 Dynarr_add (dst, '\r');
2975 if (eol_type != EOL_CR)
2976 Dynarr_add (dst, ch);
2980 Lisp_Object charset;
2981 unsigned int c1, c2, s1, s2;
2984 if ( (c1 = get_byte_from_character_table (ch, ucs_to_latin_jisx0201)) )
2986 charset = Vcharset_latin_jisx0201;
2991 BREAKUP_CHAR (ch, charset, c1, c2);
2993 if (EQ(charset, Vcharset_katakana_jisx0201))
2995 Dynarr_add (dst, c1 | 0x80);
2999 Dynarr_add (dst, c1);
3001 else if (EQ(charset, Vcharset_japanese_jisx0208))
3003 ENCODE_SJIS (c1 | 0x80, c2 | 0x80, s1, s2);
3004 Dynarr_add (dst, s1);
3005 Dynarr_add (dst, s2);
3008 Dynarr_add (dst, '?');
3013 char_finish_shift_jis (struct encoding_stream *str, unsigned_char_dynarr *dst,
3014 unsigned int *flags)
3018 DEFUN ("decode-shift-jis-char", Fdecode_shift_jis_char, 1, 1, 0, /*
3019 Decode a JISX0208 character of Shift-JIS coding-system.
3020 CODE is the character code in Shift-JIS as a cons of type bytes.
3021 Return the corresponding character.
3025 unsigned char c1, c2, s1, s2;
3028 CHECK_INT (XCAR (code));
3029 CHECK_INT (XCDR (code));
3030 s1 = XINT (XCAR (code));
3031 s2 = XINT (XCDR (code));
3032 if (BYTE_SJIS_TWO_BYTE_1_P (s1) &&
3033 BYTE_SJIS_TWO_BYTE_2_P (s2))
3035 DECODE_SJIS (s1, s2, c1, c2);
3036 return make_char (MAKE_CHAR (Vcharset_japanese_jisx0208,
3037 c1 & 0x7F, c2 & 0x7F));
3043 DEFUN ("encode-shift-jis-char", Fencode_shift_jis_char, 1, 1, 0, /*
3044 Encode a JISX0208 character CHAR to SHIFT-JIS coding-system.
3045 Return the corresponding character code in SHIFT-JIS as a cons of two bytes.
3049 Lisp_Object charset;
3052 CHECK_CHAR_COERCE_INT (ch);
3053 BREAKUP_CHAR (XCHAR (ch), charset, c1, c2);
3054 if (EQ (charset, Vcharset_japanese_jisx0208))
3056 ENCODE_SJIS (c1 | 0x80, c2 | 0x80, s1, s2);
3057 return Fcons (make_int (s1), make_int (s2));
3064 /************************************************************************/
3066 /************************************************************************/
3068 /* BIG5 is a coding system encoding two character sets: ASCII and
3069 Big5. An ASCII character is encoded as is. Big5 is a two-byte
3070 character set and is encoded in two-byte.
3072 --- CODE RANGE of BIG5 ---
3073 (character set) (range)
3075 Big5 (1st byte) 0xA1 .. 0xFE
3076 (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE
3077 --------------------------
3079 Since the number of characters in Big5 is larger than maximum
3080 characters in Emacs' charset (96x96), it can't be handled as one
3081 charset. So, in Emacs, Big5 is divided into two: `charset-big5-1'
3082 and `charset-big5-2'. Both <type>s are DIMENSION2_CHARS94. The former
3083 contains frequently used characters and the latter contains less
3084 frequently used characters. */
3086 #define BYTE_BIG5_TWO_BYTE_1_P(c) \
3087 ((c) >= 0xA1 && (c) <= 0xFE)
3089 /* Is this the second byte of a Shift-JIS two-byte char? */
3091 #define BYTE_BIG5_TWO_BYTE_2_P(c) \
3092 (((c) >= 0x40 && (c) <= 0x7E) || ((c) >= 0xA1 && (c) <= 0xFE))
3094 /* Number of Big5 characters which have the same code in 1st byte. */
3096 #define BIG5_SAME_ROW (0xFF - 0xA1 + 0x7F - 0x40)
3098 /* Code conversion macros. These are macros because they are used in
3099 inner loops during code conversion.
3101 Note that temporary variables in macros introduce the classic
3102 dynamic-scoping problems with variable names. We use capital-
3103 lettered variables in the assumption that XEmacs does not use
3104 capital letters in variables except in a very formalized way
3107 /* Convert Big5 code (b1, b2) into its internal string representation
3110 /* There is a much simpler way to split the Big5 charset into two.
3111 For the moment I'm going to leave the algorithm as-is because it
3112 claims to separate out the most-used characters into a single
3113 charset, which perhaps will lead to optimizations in various
3116 The way the algorithm works is something like this:
3118 Big5 can be viewed as a 94x157 charset, where the row is
3119 encoded into the bytes 0xA1 .. 0xFE and the column is encoded
3120 into the bytes 0x40 .. 0x7E and 0xA1 .. 0xFE. As for frequency,
3121 the split between low and high column numbers is apparently
3122 meaningless; ascending rows produce less and less frequent chars.
3123 Therefore, we assign the lower half of rows (0xA1 .. 0xC8) to
3124 the first charset, and the upper half (0xC9 .. 0xFE) to the
3125 second. To do the conversion, we convert the character into
3126 a single number where 0 .. 156 is the first row, 157 .. 313
3127 is the second, etc. That way, the characters are ordered by
3128 decreasing frequency. Then we just chop the space in two
3129 and coerce the result into a 94x94 space.
3132 #define DECODE_BIG5(b1, b2, lb, c1, c2) do \
3134 int B1 = b1, B2 = b2; \
3136 = (B1 - 0xA1) * BIG5_SAME_ROW + B2 - (B2 < 0x7F ? 0x40 : 0x62); \
3140 lb = LEADING_BYTE_CHINESE_BIG5_1; \
3144 lb = LEADING_BYTE_CHINESE_BIG5_2; \
3145 I -= (BIG5_SAME_ROW) * (0xC9 - 0xA1); \
3147 c1 = I / (0xFF - 0xA1) + 0xA1; \
3148 c2 = I % (0xFF - 0xA1) + 0xA1; \
3151 /* Convert the internal string representation of a Big5 character
3152 (lb, c1, c2) into Big5 code (b1, b2). */
3154 #define ENCODE_BIG5(lb, c1, c2, b1, b2) do \
3156 unsigned int I = ((c1) - 0xA1) * (0xFF - 0xA1) + ((c2) - 0xA1); \
3158 if (lb == LEADING_BYTE_CHINESE_BIG5_2) \
3160 I += BIG5_SAME_ROW * (0xC9 - 0xA1); \
3162 b1 = I / BIG5_SAME_ROW + 0xA1; \
3163 b2 = I % BIG5_SAME_ROW; \
3164 b2 += b2 < 0x3F ? 0x40 : 0x62; \
3168 detect_coding_big5 (struct detection_state *st, CONST unsigned char *src,
3176 if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO ||
3177 (c >= 0x80 && c <= 0xA0))
3179 if (st->big5.in_second_byte)
3181 st->big5.in_second_byte = 0;
3182 if (c < 0x40 || (c >= 0x80 && c <= 0xA0))
3186 st->big5.in_second_byte = 1;
3188 return CODING_CATEGORY_BIG5_MASK;
3191 /* Convert Big5 data to internal format. */
3194 decode_coding_big5 (Lstream *decoding, CONST unsigned char *src,
3195 unsigned_char_dynarr *dst, unsigned int n)
3198 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
3199 unsigned int flags = str->flags;
3200 unsigned int ch = str->ch;
3201 eol_type_t eol_type = str->eol_type;
3208 /* Previous character was first byte of Big5 char. */
3209 if (BYTE_BIG5_TWO_BYTE_2_P (c))
3211 unsigned char b1, b2, b3;
3212 DECODE_BIG5 (ch, c, b1, b2, b3);
3213 Dynarr_add (dst, b1);
3214 Dynarr_add (dst, b2);
3215 Dynarr_add (dst, b3);
3219 DECODE_ADD_BINARY_CHAR (ch, dst);
3220 DECODE_ADD_BINARY_CHAR (c, dst);
3226 DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst);
3227 if (BYTE_BIG5_TWO_BYTE_1_P (c))
3230 DECODE_ADD_BINARY_CHAR (c, dst);
3232 label_continue_loop:;
3235 DECODE_HANDLE_END_OF_CONVERSION (flags, ch, dst);
3241 /* Convert internally-formatted data to Big5. */
3244 encode_coding_big5 (Lstream *encoding, CONST unsigned char *src,
3245 unsigned_char_dynarr *dst, unsigned int n)
3249 struct encoding_stream *str = ENCODING_STREAM_DATA (encoding);
3250 unsigned int flags = str->flags;
3251 unsigned int ch = str->ch;
3252 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys);
3259 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
3260 Dynarr_add (dst, '\r');
3261 if (eol_type != EOL_CR)
3262 Dynarr_add (dst, '\n');
3264 else if (BYTE_ASCII_P (c))
3267 Dynarr_add (dst, c);
3269 else if (BUFBYTE_LEADING_BYTE_P (c))
3271 if (c == LEADING_BYTE_CHINESE_BIG5_1 ||
3272 c == LEADING_BYTE_CHINESE_BIG5_2)
3274 /* A recognized leading byte. */
3276 continue; /* not done with this character. */
3278 /* otherwise just ignore this character. */
3280 else if (ch == LEADING_BYTE_CHINESE_BIG5_1 ||
3281 ch == LEADING_BYTE_CHINESE_BIG5_2)
3283 /* Previous char was a recognized leading byte. */
3285 continue; /* not done with this character. */
3289 /* Encountering second byte of a Big5 character. */
3290 unsigned char b1, b2;
3292 ENCODE_BIG5 (ch >> 8, ch & 0xFF, c, b1, b2);
3293 Dynarr_add (dst, b1);
3294 Dynarr_add (dst, b2);
3306 DEFUN ("decode-big5-char", Fdecode_big5_char, 1, 1, 0, /*
3307 Decode a Big5 character CODE of BIG5 coding-system.
3308 CODE is the character code in BIG5, a cons of two integers.
3309 Return the corresponding character.
3313 unsigned char c1, c2, b1, b2;
3316 CHECK_INT (XCAR (code));
3317 CHECK_INT (XCDR (code));
3318 b1 = XINT (XCAR (code));
3319 b2 = XINT (XCDR (code));
3320 if (BYTE_BIG5_TWO_BYTE_1_P (b1) &&
3321 BYTE_BIG5_TWO_BYTE_2_P (b2))
3323 Charset_ID leading_byte;
3324 Lisp_Object charset;
3325 DECODE_BIG5 (b1, b2, leading_byte, c1, c2);
3326 charset = CHARSET_BY_LEADING_BYTE (leading_byte);
3327 return make_char (MAKE_CHAR (charset, c1 & 0x7F, c2 & 0x7F));
3333 DEFUN ("encode-big5-char", Fencode_big5_char, 1, 1, 0, /*
3334 Encode the Big5 character CH to BIG5 coding-system.
3335 Return the corresponding character code in Big5.
3339 Lisp_Object charset;
3342 CHECK_CHAR_COERCE_INT (ch);
3343 BREAKUP_CHAR (XCHAR (ch), charset, c1, c2);
3344 if (EQ (charset, Vcharset_chinese_big5_1) ||
3345 EQ (charset, Vcharset_chinese_big5_2))
3347 ENCODE_BIG5 (XCHARSET_LEADING_BYTE (charset), c1 | 0x80, c2 | 0x80,
3349 return Fcons (make_int (b1), make_int (b2));
3356 /************************************************************************/
3358 /************************************************************************/
3361 detect_coding_ucs4 (struct detection_state *st, CONST unsigned char *src,
3367 switch (st->ucs4.in_byte)
3376 st->ucs4.in_byte = 0;
3382 return CODING_CATEGORY_UCS4_MASK;
3386 decode_coding_ucs4 (Lstream *decoding, CONST unsigned char *src,
3387 unsigned_char_dynarr *dst, unsigned int n)
3389 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
3390 unsigned int flags = str->flags;
3391 unsigned int ch = str->ch;
3392 unsigned char counter = str->counter;
3396 unsigned char c = *src++;
3404 DECODE_ADD_UCS_CHAR ((ch << 8) | c, dst);
3409 ch = ( ch << 8 ) | c;
3413 if (counter & CODING_STATE_END)
3414 DECODE_OUTPUT_PARTIAL_CHAR (ch);
3418 str->counter = counter;
3422 char_encode_ucs4 (struct encoding_stream *str, Emchar ch,
3423 unsigned_char_dynarr *dst, unsigned int *flags)
3425 Dynarr_add (dst, ch >> 24);
3426 Dynarr_add (dst, (ch >> 16) & 255);
3427 Dynarr_add (dst, (ch >> 8) & 255);
3428 Dynarr_add (dst, ch & 255);
3432 char_finish_ucs4 (struct encoding_stream *str, unsigned_char_dynarr *dst,
3433 unsigned int *flags)
3438 /************************************************************************/
3440 /************************************************************************/
3443 detect_coding_utf8 (struct detection_state *st, CONST unsigned char *src,
3448 unsigned char c = *src++;
3449 switch (st->utf8.in_byte)
3452 if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
3455 st->utf8.in_byte = 5;
3457 st->utf8.in_byte = 4;
3459 st->utf8.in_byte = 3;
3461 st->utf8.in_byte = 2;
3463 st->utf8.in_byte = 1;
3468 if ((c & 0xc0) != 0x80)
3474 return CODING_CATEGORY_UTF8_MASK;
3478 decode_coding_utf8 (Lstream *decoding, CONST unsigned char *src,
3479 unsigned_char_dynarr *dst, unsigned int n)
3481 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
3482 unsigned int flags = str->flags;
3483 unsigned int ch = str->ch;
3484 eol_type_t eol_type = str->eol_type;
3485 unsigned char counter = str->counter;
3489 unsigned char c = *src++;
3498 else if ( c >= 0xf8 )
3503 else if ( c >= 0xf0 )
3508 else if ( c >= 0xe0 )
3513 else if ( c >= 0xc0 )
3520 DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst);
3521 DECODE_ADD_UCS_CHAR (c, dst);
3525 ch = ( ch << 6 ) | ( c & 0x3f );
3526 DECODE_ADD_UCS_CHAR (ch, dst);
3531 ch = ( ch << 6 ) | ( c & 0x3f );
3534 label_continue_loop:;
3537 if (flags & CODING_STATE_END)
3538 DECODE_OUTPUT_PARTIAL_CHAR (ch);
3542 str->counter = counter;
3546 char_encode_utf8 (struct encoding_stream *str, Emchar ch,
3547 unsigned_char_dynarr *dst, unsigned int *flags)
3549 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys);
3553 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
3554 Dynarr_add (dst, '\r');
3555 if (eol_type != EOL_CR)
3556 Dynarr_add (dst, ch);
3558 else if (ch <= 0x7f)
3560 Dynarr_add (dst, ch);
3562 else if (ch <= 0x7ff)
3564 Dynarr_add (dst, (ch >> 6) | 0xc0);
3565 Dynarr_add (dst, (ch & 0x3f) | 0x80);
3567 else if (ch <= 0xffff)
3569 Dynarr_add (dst, (ch >> 12) | 0xe0);
3570 Dynarr_add (dst, ((ch >> 6) & 0x3f) | 0x80);
3571 Dynarr_add (dst, (ch & 0x3f) | 0x80);
3573 else if (ch <= 0x1fffff)
3575 Dynarr_add (dst, (ch >> 18) | 0xf0);
3576 Dynarr_add (dst, ((ch >> 12) & 0x3f) | 0x80);
3577 Dynarr_add (dst, ((ch >> 6) & 0x3f) | 0x80);
3578 Dynarr_add (dst, (ch & 0x3f) | 0x80);
3580 else if (ch <= 0x3ffffff)
3582 Dynarr_add (dst, (ch >> 24) | 0xf8);
3583 Dynarr_add (dst, ((ch >> 18) & 0x3f) | 0x80);
3584 Dynarr_add (dst, ((ch >> 12) & 0x3f) | 0x80);
3585 Dynarr_add (dst, ((ch >> 6) & 0x3f) | 0x80);
3586 Dynarr_add (dst, (ch & 0x3f) | 0x80);
3590 Dynarr_add (dst, (ch >> 30) | 0xfc);
3591 Dynarr_add (dst, ((ch >> 24) & 0x3f) | 0x80);
3592 Dynarr_add (dst, ((ch >> 18) & 0x3f) | 0x80);
3593 Dynarr_add (dst, ((ch >> 12) & 0x3f) | 0x80);
3594 Dynarr_add (dst, ((ch >> 6) & 0x3f) | 0x80);
3595 Dynarr_add (dst, (ch & 0x3f) | 0x80);
3600 char_finish_utf8 (struct encoding_stream *str, unsigned_char_dynarr *dst,
3601 unsigned int *flags)
3606 /************************************************************************/
3607 /* ISO2022 methods */
3608 /************************************************************************/
3610 /* The following note describes the coding system ISO2022 briefly.
3611 Since the intention of this note is to help understand the
3612 functions in this file, some parts are NOT ACCURATE or OVERLY
3613 SIMPLIFIED. For thorough understanding, please refer to the
3614 original document of ISO2022.
3616 ISO2022 provides many mechanisms to encode several character sets
3617 in 7-bit and 8-bit environments. For 7-bit environments, all text
3618 is encoded using bytes less than 128. This may make the encoded
3619 text a little bit longer, but the text passes more easily through
3620 several gateways, some of which strip off MSB (Most Signigant Bit).
3622 There are two kinds of character sets: control character set and
3623 graphic character set. The former contains control characters such
3624 as `newline' and `escape' to provide control functions (control
3625 functions are also provided by escape sequences). The latter
3626 contains graphic characters such as 'A' and '-'. Emacs recognizes
3627 two control character sets and many graphic character sets.
3629 Graphic character sets are classified into one of the following
3630 four classes, according to the number of bytes (DIMENSION) and
3631 number of characters in one dimension (CHARS) of the set:
3632 - DIMENSION1_CHARS94
3633 - DIMENSION1_CHARS96
3634 - DIMENSION2_CHARS94
3635 - DIMENSION2_CHARS96
3637 In addition, each character set is assigned an identification tag,
3638 unique for each set, called "final character" (denoted as <F>
3639 hereafter). The <F> of each character set is decided by ECMA(*)
3640 when it is registered in ISO. The code range of <F> is 0x30..0x7F
3641 (0x30..0x3F are for private use only).
3643 Note (*): ECMA = European Computer Manufacturers Association
3645 Here are examples of graphic character set [NAME(<F>)]:
3646 o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ...
3647 o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ...
3648 o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ...
3649 o DIMENSION2_CHARS96 -- none for the moment
3651 A code area (1 byte = 8 bits) is divided into 4 areas, C0, GL, C1, and GR.
3652 C0 [0x00..0x1F] -- control character plane 0
3653 GL [0x20..0x7F] -- graphic character plane 0
3654 C1 [0x80..0x9F] -- control character plane 1
3655 GR [0xA0..0xFF] -- graphic character plane 1
3657 A control character set is directly designated and invoked to C0 or
3658 C1 by an escape sequence. The most common case is that:
3659 - ISO646's control character set is designated/invoked to C0, and
3660 - ISO6429's control character set is designated/invoked to C1,
3661 and usually these designations/invocations are omitted in encoded
3662 text. In a 7-bit environment, only C0 can be used, and a control
3663 character for C1 is encoded by an appropriate escape sequence to
3664 fit into the environment. All control characters for C1 are
3665 defined to have corresponding escape sequences.
3667 A graphic character set is at first designated to one of four
3668 graphic registers (G0 through G3), then these graphic registers are
3669 invoked to GL or GR. These designations and invocations can be
3670 done independently. The most common case is that G0 is invoked to
3671 GL, G1 is invoked to GR, and ASCII is designated to G0. Usually
3672 these invocations and designations are omitted in encoded text.
3673 In a 7-bit environment, only GL can be used.
3675 When a graphic character set of CHARS94 is invoked to GL, codes
3676 0x20 and 0x7F of the GL area work as control characters SPACE and
3677 DEL respectively, and codes 0xA0 and 0xFF of the GR area should not
3680 There are two ways of invocation: locking-shift and single-shift.
3681 With locking-shift, the invocation lasts until the next different
3682 invocation, whereas with single-shift, the invocation affects the
3683 following character only and doesn't affect the locking-shift
3684 state. Invocations are done by the following control characters or
3687 ----------------------------------------------------------------------
3688 abbrev function cntrl escape seq description
3689 ----------------------------------------------------------------------
3690 SI/LS0 (shift-in) 0x0F none invoke G0 into GL
3691 SO/LS1 (shift-out) 0x0E none invoke G1 into GL
3692 LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL
3693 LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL
3694 LS1R (locking-shift-1 right) none ESC '~' invoke G1 into GR (*)
3695 LS2R (locking-shift-2 right) none ESC '}' invoke G2 into GR (*)
3696 LS3R (locking-shift 3 right) none ESC '|' invoke G3 into GR (*)
3697 SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 for one char
3698 SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 for one char
3699 ----------------------------------------------------------------------
3700 (*) These are not used by any known coding system.
3702 Control characters for these functions are defined by macros
3703 ISO_CODE_XXX in `coding.h'.
3705 Designations are done by the following escape sequences:
3706 ----------------------------------------------------------------------
3707 escape sequence description
3708 ----------------------------------------------------------------------
3709 ESC '(' <F> designate DIMENSION1_CHARS94<F> to G0
3710 ESC ')' <F> designate DIMENSION1_CHARS94<F> to G1
3711 ESC '*' <F> designate DIMENSION1_CHARS94<F> to G2
3712 ESC '+' <F> designate DIMENSION1_CHARS94<F> to G3
3713 ESC ',' <F> designate DIMENSION1_CHARS96<F> to G0 (*)
3714 ESC '-' <F> designate DIMENSION1_CHARS96<F> to G1
3715 ESC '.' <F> designate DIMENSION1_CHARS96<F> to G2
3716 ESC '/' <F> designate DIMENSION1_CHARS96<F> to G3
3717 ESC '$' '(' <F> designate DIMENSION2_CHARS94<F> to G0 (**)
3718 ESC '$' ')' <F> designate DIMENSION2_CHARS94<F> to G1
3719 ESC '$' '*' <F> designate DIMENSION2_CHARS94<F> to G2
3720 ESC '$' '+' <F> designate DIMENSION2_CHARS94<F> to G3
3721 ESC '$' ',' <F> designate DIMENSION2_CHARS96<F> to G0 (*)
3722 ESC '$' '-' <F> designate DIMENSION2_CHARS96<F> to G1
3723 ESC '$' '.' <F> designate DIMENSION2_CHARS96<F> to G2
3724 ESC '$' '/' <F> designate DIMENSION2_CHARS96<F> to G3
3725 ----------------------------------------------------------------------
3727 In this list, "DIMENSION1_CHARS94<F>" means a graphic character set
3728 of dimension 1, chars 94, and final character <F>, etc...
3730 Note (*): Although these designations are not allowed in ISO2022,
3731 Emacs accepts them on decoding, and produces them on encoding
3732 CHARS96 character sets in a coding system which is characterized as
3733 7-bit environment, non-locking-shift, and non-single-shift.
3735 Note (**): If <F> is '@', 'A', or 'B', the intermediate character
3736 '(' can be omitted. We refer to this as "short-form" hereafter.
3738 Now you may notice that there are a lot of ways for encoding the
3739 same multilingual text in ISO2022. Actually, there exist many
3740 coding systems such as Compound Text (used in X11's inter client
3741 communication, ISO-2022-JP (used in Japanese internet), ISO-2022-KR
3742 (used in Korean internet), EUC (Extended UNIX Code, used in Asian
3743 localized platforms), and all of these are variants of ISO2022.
3745 In addition to the above, Emacs handles two more kinds of escape
3746 sequences: ISO6429's direction specification and Emacs' private
3747 sequence for specifying character composition.
3749 ISO6429's direction specification takes the following form:
3750 o CSI ']' -- end of the current direction
3751 o CSI '0' ']' -- end of the current direction
3752 o CSI '1' ']' -- start of left-to-right text
3753 o CSI '2' ']' -- start of right-to-left text
3754 The control character CSI (0x9B: control sequence introducer) is
3755 abbreviated to the escape sequence ESC '[' in a 7-bit environment.
3757 Character composition specification takes the following form:
3758 o ESC '0' -- start character composition
3759 o ESC '1' -- end character composition
3760 Since these are not standard escape sequences of any ISO standard,
3761 their use with these meanings is restricted to Emacs only. */
3764 reset_iso2022 (Lisp_Object coding_system, struct iso2022_decoder *iso)
3768 for (i = 0; i < 4; i++)
3770 if (!NILP (coding_system))
3772 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, i);
3774 iso->charset[i] = Qt;
3775 iso->invalid_designated[i] = 0;
3777 iso->esc = ISO_ESC_NOTHING;
3778 iso->esc_bytes_index = 0;
3779 iso->register_left = 0;
3780 iso->register_right = 1;
3781 iso->switched_dir_and_no_valid_charset_yet = 0;
3782 iso->invalid_switch_dir = 0;
3783 iso->output_direction_sequence = 0;
3784 iso->output_literally = 0;
3785 #ifdef ENABLE_COMPOSITE_CHARS
3786 if (iso->composite_chars)
3787 Dynarr_reset (iso->composite_chars);
3792 fit_to_be_escape_quoted (unsigned char c)
3809 /* Parse one byte of an ISO2022 escape sequence.
3810 If the result is an invalid escape sequence, return 0 and
3811 do not change anything in STR. Otherwise, if the result is
3812 an incomplete escape sequence, update ISO2022.ESC and
3813 ISO2022.ESC_BYTES and return -1. Otherwise, update
3814 all the state variables (but not ISO2022.ESC_BYTES) and
3817 If CHECK_INVALID_CHARSETS is non-zero, check for designation
3818 or invocation of an invalid character set and treat that as
3819 an unrecognized escape sequence. */
3822 parse_iso2022_esc (Lisp_Object codesys, struct iso2022_decoder *iso,
3823 unsigned char c, unsigned int *flags,
3824 int check_invalid_charsets)
3826 /* (1) If we're at the end of a designation sequence, CS is the
3827 charset being designated and REG is the register to designate
3830 (2) If we're at the end of a locking-shift sequence, REG is
3831 the register to invoke and HALF (0 == left, 1 == right) is
3832 the half to invoke it into.
3834 (3) If we're at the end of a single-shift sequence, REG is
3835 the register to invoke. */
3836 Lisp_Object cs = Qnil;
3839 /* NOTE: This code does goto's all over the fucking place.
3840 The reason for this is that we're basically implementing
3841 a state machine here, and hierarchical languages like C
3842 don't really provide a clean way of doing this. */
3844 if (! (*flags & CODING_STATE_ESCAPE))
3845 /* At beginning of escape sequence; we need to reset our
3846 escape-state variables. */
3847 iso->esc = ISO_ESC_NOTHING;
3849 iso->output_literally = 0;
3850 iso->output_direction_sequence = 0;
3854 case ISO_ESC_NOTHING:
3855 iso->esc_bytes_index = 0;
3858 case ISO_CODE_ESC: /* Start escape sequence */
3859 *flags |= CODING_STATE_ESCAPE;
3863 case ISO_CODE_CSI: /* ISO6429 (specifying directionality) */
3864 *flags |= CODING_STATE_ESCAPE;
3865 iso->esc = ISO_ESC_5_11;
3868 case ISO_CODE_SO: /* locking shift 1 */
3871 case ISO_CODE_SI: /* locking shift 0 */
3875 case ISO_CODE_SS2: /* single shift */
3878 case ISO_CODE_SS3: /* single shift */
3882 default: /* Other control characters */
3889 /**** single shift ****/
3891 case 'N': /* single shift 2 */
3894 case 'O': /* single shift 3 */
3898 /**** locking shift ****/
3900 case '~': /* locking shift 1 right */
3903 case 'n': /* locking shift 2 */
3906 case '}': /* locking shift 2 right */
3909 case 'o': /* locking shift 3 */
3912 case '|': /* locking shift 3 right */
3916 #ifdef ENABLE_COMPOSITE_CHARS
3917 /**** composite ****/
3920 iso->esc = ISO_ESC_START_COMPOSITE;
3921 *flags = (*flags & CODING_STATE_ISO2022_LOCK) |
3922 CODING_STATE_COMPOSITE;
3926 iso->esc = ISO_ESC_END_COMPOSITE;
3927 *flags = (*flags & CODING_STATE_ISO2022_LOCK) &
3928 ~CODING_STATE_COMPOSITE;
3930 #endif /* ENABLE_COMPOSITE_CHARS */
3932 /**** directionality ****/
3935 iso->esc = ISO_ESC_5_11;
3938 /**** designation ****/
3940 case '$': /* multibyte charset prefix */
3941 iso->esc = ISO_ESC_2_4;
3945 if (0x28 <= c && c <= 0x2F)
3947 iso->esc = (enum iso_esc_flag) (c - 0x28 + ISO_ESC_2_8);
3951 /* This function is called with CODESYS equal to nil when
3952 doing coding-system detection. */
3954 && XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys)
3955 && fit_to_be_escape_quoted (c))
3957 iso->esc = ISO_ESC_LITERAL;
3958 *flags &= CODING_STATE_ISO2022_LOCK;
3968 /**** directionality ****/
3970 case ISO_ESC_5_11: /* ISO6429 direction control */
3973 *flags &= (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L);
3974 goto directionality;
3976 if (c == '0') iso->esc = ISO_ESC_5_11_0;
3977 else if (c == '1') iso->esc = ISO_ESC_5_11_1;
3978 else if (c == '2') iso->esc = ISO_ESC_5_11_2;
3982 case ISO_ESC_5_11_0:
3985 *flags &= (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L);
3986 goto directionality;
3990 case ISO_ESC_5_11_1:
3993 *flags = (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L);
3994 goto directionality;
3998 case ISO_ESC_5_11_2:
4001 *flags = (*flags & CODING_STATE_ISO2022_LOCK) | CODING_STATE_R2L;
4002 goto directionality;
4007 iso->esc = ISO_ESC_DIRECTIONALITY;
4008 /* Various junk here to attempt to preserve the direction sequences
4009 literally in the text if they would otherwise be swallowed due
4010 to invalid designations that don't show up as actual charset
4011 changes in the text. */
4012 if (iso->invalid_switch_dir)
4014 /* We already inserted a direction switch literally into the
4015 text. We assume (#### this may not be right) that the
4016 next direction switch is the one going the other way,
4017 and we need to output that literally as well. */
4018 iso->output_literally = 1;
4019 iso->invalid_switch_dir = 0;
4025 /* If we are in the thrall of an invalid designation,
4026 then stick the directionality sequence literally into the
4027 output stream so it ends up in the original text again. */
4028 for (jj = 0; jj < 4; jj++)
4029 if (iso->invalid_designated[jj])
4033 iso->output_literally = 1;
4034 iso->invalid_switch_dir = 1;
4037 /* Indicate that we haven't yet seen a valid designation,
4038 so that if a switch-dir is directly followed by an
4039 invalid designation, both get inserted literally. */
4040 iso->switched_dir_and_no_valid_charset_yet = 1;
4045 /**** designation ****/
4048 if (0x28 <= c && c <= 0x2F)
4050 iso->esc = (enum iso_esc_flag) (c - 0x28 + ISO_ESC_2_4_8);
4053 if (0x40 <= c && c <= 0x42)
4055 cs = CHARSET_BY_ATTRIBUTES (CHARSET_TYPE_94X94, c,
4056 *flags & CODING_STATE_R2L ?
4057 CHARSET_RIGHT_TO_LEFT :
4058 CHARSET_LEFT_TO_RIGHT);
4068 if (c < '0' || c > '~')
4069 return 0; /* bad final byte */
4071 if (iso->esc >= ISO_ESC_2_8 &&
4072 iso->esc <= ISO_ESC_2_15)
4074 type = ((iso->esc >= ISO_ESC_2_12) ?
4075 CHARSET_TYPE_96 : CHARSET_TYPE_94);
4076 reg = (iso->esc - ISO_ESC_2_8) & 3;
4078 else if (iso->esc >= ISO_ESC_2_4_8 &&
4079 iso->esc <= ISO_ESC_2_4_15)
4081 type = ((iso->esc >= ISO_ESC_2_4_12) ?
4082 CHARSET_TYPE_96X96 : CHARSET_TYPE_94X94);
4083 reg = (iso->esc - ISO_ESC_2_4_8) & 3;
4087 /* Can this ever be reached? -slb */
4091 cs = CHARSET_BY_ATTRIBUTES (type, c,
4092 *flags & CODING_STATE_R2L ?
4093 CHARSET_RIGHT_TO_LEFT :
4094 CHARSET_LEFT_TO_RIGHT);
4100 iso->esc_bytes[iso->esc_bytes_index++] = (unsigned char) c;
4104 if (check_invalid_charsets && !CHARSETP (iso->charset[reg]))
4105 /* can't invoke something that ain't there. */
4107 iso->esc = ISO_ESC_SINGLE_SHIFT;
4108 *flags &= CODING_STATE_ISO2022_LOCK;
4110 *flags |= CODING_STATE_SS2;
4112 *flags |= CODING_STATE_SS3;
4116 if (check_invalid_charsets &&
4117 !CHARSETP (iso->charset[reg]))
4118 /* can't invoke something that ain't there. */
4121 iso->register_right = reg;
4123 iso->register_left = reg;
4124 *flags &= CODING_STATE_ISO2022_LOCK;
4125 iso->esc = ISO_ESC_LOCKING_SHIFT;
4129 if (NILP (cs) && check_invalid_charsets)
4131 iso->invalid_designated[reg] = 1;
4132 iso->charset[reg] = Vcharset_ascii;
4133 iso->esc = ISO_ESC_DESIGNATE;
4134 *flags &= CODING_STATE_ISO2022_LOCK;
4135 iso->output_literally = 1;
4136 if (iso->switched_dir_and_no_valid_charset_yet)
4138 /* We encountered a switch-direction followed by an
4139 invalid designation. Ensure that the switch-direction
4140 gets outputted; otherwise it will probably get eaten
4141 when the text is written out again. */
4142 iso->switched_dir_and_no_valid_charset_yet = 0;
4143 iso->output_direction_sequence = 1;
4144 /* And make sure that the switch-dir going the other
4145 way gets outputted, as well. */
4146 iso->invalid_switch_dir = 1;
4150 /* This function is called with CODESYS equal to nil when
4151 doing coding-system detection. */
4152 if (!NILP (codesys))
4154 charset_conversion_spec_dynarr *dyn =
4155 XCODING_SYSTEM (codesys)->iso2022.input_conv;
4161 for (i = 0; i < Dynarr_length (dyn); i++)
4163 struct charset_conversion_spec *spec = Dynarr_atp (dyn, i);
4164 if (EQ (cs, spec->from_charset))
4165 cs = spec->to_charset;
4170 iso->charset[reg] = cs;
4171 iso->esc = ISO_ESC_DESIGNATE;
4172 *flags &= CODING_STATE_ISO2022_LOCK;
4173 if (iso->invalid_designated[reg])
4175 iso->invalid_designated[reg] = 0;
4176 iso->output_literally = 1;
4178 if (iso->switched_dir_and_no_valid_charset_yet)
4179 iso->switched_dir_and_no_valid_charset_yet = 0;
4184 detect_coding_iso2022 (struct detection_state *st, CONST unsigned char *src,
4189 /* #### There are serious deficiencies in the recognition mechanism
4190 here. This needs to be much smarter if it's going to cut it.
4191 The sequence "\xff\x0f" is currently detected as LOCK_SHIFT while
4192 it should be detected as Latin-1.
4193 All the ISO2022 stuff in this file should be synced up with the
4194 code from FSF Emacs-20.4, in which Mule should be more or less stable.
4195 Perhaps we should wait till R2L works in FSF Emacs? */
4197 if (!st->iso2022.initted)
4199 reset_iso2022 (Qnil, &st->iso2022.iso);
4200 st->iso2022.mask = (CODING_CATEGORY_ISO_7_MASK |
4201 CODING_CATEGORY_ISO_8_DESIGNATE_MASK |
4202 CODING_CATEGORY_ISO_8_1_MASK |
4203 CODING_CATEGORY_ISO_8_2_MASK |
4204 CODING_CATEGORY_ISO_LOCK_SHIFT_MASK);
4205 st->iso2022.flags = 0;
4206 st->iso2022.high_byte_count = 0;
4207 st->iso2022.saw_single_shift = 0;
4208 st->iso2022.initted = 1;
4211 mask = st->iso2022.mask;
4218 mask &= ~CODING_CATEGORY_ISO_7_MASK;
4219 st->iso2022.high_byte_count++;
4223 if (st->iso2022.high_byte_count && !st->iso2022.saw_single_shift)
4225 if (st->iso2022.high_byte_count & 1)
4226 /* odd number of high bytes; assume not iso-8-2 */
4227 mask &= ~CODING_CATEGORY_ISO_8_2_MASK;
4229 st->iso2022.high_byte_count = 0;
4230 st->iso2022.saw_single_shift = 0;
4232 mask &= ~CODING_CATEGORY_ISO_7_MASK;
4234 if (!(st->iso2022.flags & CODING_STATE_ESCAPE)
4235 && (BYTE_C0_P (c) || BYTE_C1_P (c)))
4236 { /* control chars */
4239 /* Allow and ignore control characters that you might
4240 reasonably see in a text file */
4245 case 8: /* backspace */
4246 case 11: /* vertical tab */
4247 case 12: /* form feed */
4248 case 26: /* MS-DOS C-z junk */
4249 case 31: /* '^_' -- for info */
4250 goto label_continue_loop;
4257 if ((st->iso2022.flags & CODING_STATE_ESCAPE) || BYTE_C0_P (c)
4260 if (parse_iso2022_esc (Qnil, &st->iso2022.iso, c,
4261 &st->iso2022.flags, 0))
4263 switch (st->iso2022.iso.esc)
4265 case ISO_ESC_DESIGNATE:
4266 mask &= ~CODING_CATEGORY_ISO_8_1_MASK;
4267 mask &= ~CODING_CATEGORY_ISO_8_2_MASK;
4269 case ISO_ESC_LOCKING_SHIFT:
4270 mask = CODING_CATEGORY_ISO_LOCK_SHIFT_MASK;
4271 goto ran_out_of_chars;
4272 case ISO_ESC_SINGLE_SHIFT:
4273 mask &= ~CODING_CATEGORY_ISO_8_DESIGNATE_MASK;
4274 st->iso2022.saw_single_shift = 1;
4283 goto ran_out_of_chars;
4286 label_continue_loop:;
4295 postprocess_iso2022_mask (int mask)
4297 /* #### kind of cheesy */
4298 /* If seven-bit ISO is allowed, then assume that the encoding is
4299 entirely seven-bit and turn off the eight-bit ones. */
4300 if (mask & CODING_CATEGORY_ISO_7_MASK)
4301 mask &= ~ (CODING_CATEGORY_ISO_8_DESIGNATE_MASK |
4302 CODING_CATEGORY_ISO_8_1_MASK |
4303 CODING_CATEGORY_ISO_8_2_MASK);
4307 /* If FLAGS is a null pointer or specifies right-to-left motion,
4308 output a switch-dir-to-left-to-right sequence to DST.
4309 Also update FLAGS if it is not a null pointer.
4310 If INTERNAL_P is set, we are outputting in internal format and
4311 need to handle the CSI differently. */
4314 restore_left_to_right_direction (Lisp_Coding_System *codesys,
4315 unsigned_char_dynarr *dst,
4316 unsigned int *flags,
4319 if (!flags || (*flags & CODING_STATE_R2L))
4321 if (CODING_SYSTEM_ISO2022_SEVEN (codesys))
4323 Dynarr_add (dst, ISO_CODE_ESC);
4324 Dynarr_add (dst, '[');
4326 else if (internal_p)
4327 DECODE_ADD_BINARY_CHAR (ISO_CODE_CSI, dst);
4329 Dynarr_add (dst, ISO_CODE_CSI);
4330 Dynarr_add (dst, '0');
4331 Dynarr_add (dst, ']');
4333 *flags &= ~CODING_STATE_R2L;
4337 /* If FLAGS is a null pointer or specifies a direction different from
4338 DIRECTION (which should be either CHARSET_RIGHT_TO_LEFT or
4339 CHARSET_LEFT_TO_RIGHT), output the appropriate switch-dir escape
4340 sequence to DST. Also update FLAGS if it is not a null pointer.
4341 If INTERNAL_P is set, we are outputting in internal format and
4342 need to handle the CSI differently. */
4345 ensure_correct_direction (int direction, Lisp_Coding_System *codesys,
4346 unsigned_char_dynarr *dst, unsigned int *flags,
4349 if ((!flags || (*flags & CODING_STATE_R2L)) &&
4350 direction == CHARSET_LEFT_TO_RIGHT)
4351 restore_left_to_right_direction (codesys, dst, flags, internal_p);
4352 else if (!CODING_SYSTEM_ISO2022_NO_ISO6429 (codesys)
4353 && (!flags || !(*flags & CODING_STATE_R2L)) &&
4354 direction == CHARSET_RIGHT_TO_LEFT)
4356 if (CODING_SYSTEM_ISO2022_SEVEN (codesys))
4358 Dynarr_add (dst, ISO_CODE_ESC);
4359 Dynarr_add (dst, '[');
4361 else if (internal_p)
4362 DECODE_ADD_BINARY_CHAR (ISO_CODE_CSI, dst);
4364 Dynarr_add (dst, ISO_CODE_CSI);
4365 Dynarr_add (dst, '2');
4366 Dynarr_add (dst, ']');
4368 *flags |= CODING_STATE_R2L;
4372 /* Convert ISO2022-format data to internal format. */
4375 decode_coding_iso2022 (Lstream *decoding, CONST unsigned char *src,
4376 unsigned_char_dynarr *dst, unsigned int n)
4378 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
4379 unsigned int flags = str->flags;
4380 unsigned int ch = str->ch;
4381 eol_type_t eol_type = str->eol_type;
4382 #ifdef ENABLE_COMPOSITE_CHARS
4383 unsigned_char_dynarr *real_dst = dst;
4385 Lisp_Object coding_system;
4387 XSETCODING_SYSTEM (coding_system, str->codesys);
4389 #ifdef ENABLE_COMPOSITE_CHARS
4390 if (flags & CODING_STATE_COMPOSITE)
4391 dst = str->iso2022.composite_chars;
4392 #endif /* ENABLE_COMPOSITE_CHARS */
4396 unsigned char c = *src++;
4397 if (flags & CODING_STATE_ESCAPE)
4398 { /* Within ESC sequence */
4399 int retval = parse_iso2022_esc (coding_system, &str->iso2022,
4404 switch (str->iso2022.esc)
4406 #ifdef ENABLE_COMPOSITE_CHARS
4407 case ISO_ESC_START_COMPOSITE:
4408 if (str->iso2022.composite_chars)
4409 Dynarr_reset (str->iso2022.composite_chars);
4411 str->iso2022.composite_chars = Dynarr_new (unsigned_char);
4412 dst = str->iso2022.composite_chars;
4414 case ISO_ESC_END_COMPOSITE:
4416 Bufbyte comstr[MAX_EMCHAR_LEN];
4418 Emchar emch = lookup_composite_char (Dynarr_atp (dst, 0),
4419 Dynarr_length (dst));
4421 len = set_charptr_emchar (comstr, emch);
4422 Dynarr_add_many (dst, comstr, len);
4425 #endif /* ENABLE_COMPOSITE_CHARS */
4427 case ISO_ESC_LITERAL:
4428 DECODE_ADD_BINARY_CHAR (c, dst);
4432 /* Everything else handled already */
4437 /* Attempted error recovery. */
4438 if (str->iso2022.output_direction_sequence)
4439 ensure_correct_direction (flags & CODING_STATE_R2L ?
4440 CHARSET_RIGHT_TO_LEFT :
4441 CHARSET_LEFT_TO_RIGHT,
4442 str->codesys, dst, 0, 1);
4443 /* More error recovery. */
4444 if (!retval || str->iso2022.output_literally)
4446 /* Output the (possibly invalid) sequence */
4448 for (i = 0; i < str->iso2022.esc_bytes_index; i++)
4449 DECODE_ADD_BINARY_CHAR (str->iso2022.esc_bytes[i], dst);
4450 flags &= CODING_STATE_ISO2022_LOCK;
4452 n++, src--;/* Repeat the loop with the same character. */
4455 /* No sense in reprocessing the final byte of the
4456 escape sequence; it could mess things up anyway.
4458 DECODE_ADD_BINARY_CHAR (c, dst);
4463 else if (BYTE_C0_P (c) || BYTE_C1_P (c))
4464 { /* Control characters */
4466 /***** Error-handling *****/
4468 /* If we were in the middle of a character, dump out the
4469 partial character. */
4470 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4472 /* If we just saw a single-shift character, dump it out.
4473 This may dump out the wrong sort of single-shift character,
4474 but least it will give an indication that something went
4476 if (flags & CODING_STATE_SS2)
4478 DECODE_ADD_BINARY_CHAR (ISO_CODE_SS2, dst);
4479 flags &= ~CODING_STATE_SS2;
4481 if (flags & CODING_STATE_SS3)
4483 DECODE_ADD_BINARY_CHAR (ISO_CODE_SS3, dst);
4484 flags &= ~CODING_STATE_SS3;
4487 /***** Now handle the control characters. *****/
4490 DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst);
4492 flags &= CODING_STATE_ISO2022_LOCK;
4494 if (!parse_iso2022_esc (coding_system, &str->iso2022, c, &flags, 1))
4495 DECODE_ADD_BINARY_CHAR (c, dst);
4498 { /* Graphic characters */
4499 Lisp_Object charset;
4505 DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst);
4507 /* Now determine the charset. */
4508 reg = ((flags & CODING_STATE_SS2) ? 2
4509 : (flags & CODING_STATE_SS3) ? 3
4510 : !BYTE_ASCII_P (c) ? str->iso2022.register_right
4511 : str->iso2022.register_left);
4512 charset = str->iso2022.charset[reg];
4514 /* Error checking: */
4515 if (! CHARSETP (charset)
4516 || str->iso2022.invalid_designated[reg]
4517 || (((c & 0x7F) == ' ' || (c & 0x7F) == ISO_CODE_DEL)
4518 && XCHARSET_CHARS (charset) == 94))
4519 /* Mrmph. We are trying to invoke a register that has no
4520 or an invalid charset in it, or trying to add a character
4521 outside the range of the charset. Insert that char literally
4522 to preserve it for the output. */
4524 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4525 DECODE_ADD_BINARY_CHAR (c, dst);
4530 /* Things are probably hunky-dorey. */
4532 /* Fetch reverse charset, maybe. */
4533 if (((flags & CODING_STATE_R2L) &&
4534 XCHARSET_DIRECTION (charset) == CHARSET_LEFT_TO_RIGHT)
4536 (!(flags & CODING_STATE_R2L) &&
4537 XCHARSET_DIRECTION (charset) == CHARSET_RIGHT_TO_LEFT))
4539 Lisp_Object new_charset =
4540 XCHARSET_REVERSE_DIRECTION_CHARSET (charset);
4541 if (!NILP (new_charset))
4542 charset = new_charset;
4546 if (XCHARSET_DIMENSION (charset) == 1)
4548 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4550 (MAKE_CHAR (charset, c & 0x7F, 0), dst);
4555 (MAKE_CHAR (charset, ch & 0x7F, c & 0x7F), dst);
4561 lb = XCHARSET_LEADING_BYTE (charset);
4562 switch (XCHARSET_REP_BYTES (charset))
4565 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4566 Dynarr_add (dst, c & 0x7F);
4569 case 2: /* one-byte official */
4570 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4571 Dynarr_add (dst, lb);
4572 Dynarr_add (dst, c | 0x80);
4575 case 3: /* one-byte private or two-byte official */
4576 if (XCHARSET_PRIVATE_P (charset))
4578 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4579 Dynarr_add (dst, PRE_LEADING_BYTE_PRIVATE_1);
4580 Dynarr_add (dst, lb);
4581 Dynarr_add (dst, c | 0x80);
4587 Dynarr_add (dst, lb);
4588 Dynarr_add (dst, ch | 0x80);
4589 Dynarr_add (dst, c | 0x80);
4597 default: /* two-byte private */
4600 Dynarr_add (dst, PRE_LEADING_BYTE_PRIVATE_2);
4601 Dynarr_add (dst, lb);
4602 Dynarr_add (dst, ch | 0x80);
4603 Dynarr_add (dst, c | 0x80);
4613 flags &= CODING_STATE_ISO2022_LOCK;
4616 label_continue_loop:;
4619 if (flags & CODING_STATE_END)
4620 DECODE_OUTPUT_PARTIAL_CHAR (ch);
4627 /***** ISO2022 encoder *****/
4629 /* Designate CHARSET into register REG. */
4632 iso2022_designate (Lisp_Object charset, unsigned char reg,
4633 struct encoding_stream *str, unsigned_char_dynarr *dst)
4635 static CONST char inter94[] = "()*+";
4636 static CONST char inter96[] = ",-./";
4638 unsigned char final;
4639 Lisp_Object old_charset = str->iso2022.charset[reg];
4641 str->iso2022.charset[reg] = charset;
4642 if (!CHARSETP (charset))
4643 /* charset might be an initial nil or t. */
4645 type = XCHARSET_TYPE (charset);
4646 final = XCHARSET_FINAL (charset);
4647 if (!str->iso2022.force_charset_on_output[reg] &&
4648 CHARSETP (old_charset) &&
4649 XCHARSET_TYPE (old_charset) == type &&
4650 XCHARSET_FINAL (old_charset) == final)
4653 str->iso2022.force_charset_on_output[reg] = 0;
4656 charset_conversion_spec_dynarr *dyn =
4657 str->codesys->iso2022.output_conv;
4663 for (i = 0; i < Dynarr_length (dyn); i++)
4665 struct charset_conversion_spec *spec = Dynarr_atp (dyn, i);
4666 if (EQ (charset, spec->from_charset))
4667 charset = spec->to_charset;
4672 Dynarr_add (dst, ISO_CODE_ESC);
4675 case CHARSET_TYPE_94:
4676 Dynarr_add (dst, inter94[reg]);
4678 case CHARSET_TYPE_96:
4679 Dynarr_add (dst, inter96[reg]);
4681 case CHARSET_TYPE_94X94:
4682 Dynarr_add (dst, '$');
4684 || !(CODING_SYSTEM_ISO2022_SHORT (str->codesys))
4687 Dynarr_add (dst, inter94[reg]);
4689 case CHARSET_TYPE_96X96:
4690 Dynarr_add (dst, '$');
4691 Dynarr_add (dst, inter96[reg]);
4694 Dynarr_add (dst, final);
4698 ensure_normal_shift (struct encoding_stream *str, unsigned_char_dynarr *dst)
4700 if (str->iso2022.register_left != 0)
4702 Dynarr_add (dst, ISO_CODE_SI);
4703 str->iso2022.register_left = 0;
4708 ensure_shift_out (struct encoding_stream *str, unsigned_char_dynarr *dst)
4710 if (str->iso2022.register_left != 1)
4712 Dynarr_add (dst, ISO_CODE_SO);
4713 str->iso2022.register_left = 1;
4718 char_encode_iso2022 (struct encoding_stream *str, Emchar ch,
4719 unsigned_char_dynarr *dst, unsigned int *flags)
4721 unsigned char charmask;
4722 Lisp_Coding_System* codesys = str->codesys;
4723 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys);
4725 Lisp_Object charset = str->iso2022.current_charset;
4726 int half = str->iso2022.current_half;
4727 unsigned int byte1, byte2;
4731 restore_left_to_right_direction (codesys, dst, flags, 0);
4733 /* Make sure G0 contains ASCII */
4734 if ((ch > ' ' && ch < ISO_CODE_DEL)
4735 || !CODING_SYSTEM_ISO2022_NO_ASCII_CNTL (codesys))
4737 ensure_normal_shift (str, dst);
4738 iso2022_designate (Vcharset_ascii, 0, str, dst);
4741 /* If necessary, restore everything to the default state
4743 if (ch == '\n' && !(CODING_SYSTEM_ISO2022_NO_ASCII_EOL (codesys)))
4745 restore_left_to_right_direction (codesys, dst, flags, 0);
4747 ensure_normal_shift (str, dst);
4749 for (i = 0; i < 4; i++)
4751 Lisp_Object initial_charset =
4752 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i);
4753 iso2022_designate (initial_charset, i, str, dst);
4758 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
4759 Dynarr_add (dst, '\r');
4760 if (eol_type != EOL_CR)
4761 Dynarr_add (dst, ch);
4765 if (CODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys)
4766 && fit_to_be_escape_quoted (ch))
4767 Dynarr_add (dst, ISO_CODE_ESC);
4768 Dynarr_add (dst, ch);
4771 else if ( (0x80 <= ch) && (ch <= 0x9f) )
4773 charmask = (half == 0 ? 0x00 : 0x80);
4775 if (CODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys)
4776 && fit_to_be_escape_quoted (ch))
4777 Dynarr_add (dst, ISO_CODE_ESC);
4778 /* you asked for it ... */
4779 Dynarr_add (dst, ch);
4785 BREAKUP_CHAR (ch, charset, byte1, byte2);
4786 ensure_correct_direction (XCHARSET_DIRECTION (charset),
4787 codesys, dst, flags, 0);
4789 /* Now determine which register to use. */
4791 for (i = 0; i < 4; i++)
4793 if (EQ (charset, str->iso2022.charset[i]) ||
4795 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i)))
4804 if (XCHARSET_GRAPHIC (charset) != 0)
4806 if (!NILP (str->iso2022.charset[1]) &&
4807 (!CODING_SYSTEM_ISO2022_SEVEN (codesys)
4808 || CODING_SYSTEM_ISO2022_LOCK_SHIFT (codesys)))
4810 else if (!NILP (str->iso2022.charset[2]))
4812 else if (!NILP (str->iso2022.charset[3]))
4821 iso2022_designate (charset, reg, str, dst);
4823 /* Now invoke that register. */
4827 ensure_normal_shift (str, dst);
4831 if (CODING_SYSTEM_ISO2022_SEVEN (codesys))
4833 ensure_shift_out (str, dst);
4840 if (CODING_SYSTEM_ISO2022_SEVEN (str->codesys))
4842 Dynarr_add (dst, ISO_CODE_ESC);
4843 Dynarr_add (dst, 'N');
4848 Dynarr_add (dst, ISO_CODE_SS2);
4853 if (CODING_SYSTEM_ISO2022_SEVEN (str->codesys))
4855 Dynarr_add (dst, ISO_CODE_ESC);
4856 Dynarr_add (dst, 'O');
4861 Dynarr_add (dst, ISO_CODE_SS3);
4869 charmask = (half == 0 ? 0x00 : 0x80);
4871 switch (XCHARSET_DIMENSION (charset))
4874 Dynarr_add (dst, byte1 | charmask);
4877 Dynarr_add (dst, byte1 | charmask);
4878 Dynarr_add (dst, byte2 | charmask);
4884 str->iso2022.current_charset = charset;
4885 str->iso2022.current_half = half;
4889 char_finish_iso2022 (struct encoding_stream *str, unsigned_char_dynarr *dst,
4890 unsigned int *flags)
4892 Lisp_Coding_System* codesys = str->codesys;
4895 restore_left_to_right_direction (codesys, dst, flags, 0);
4896 ensure_normal_shift (str, dst);
4897 for (i = 0; i < 4; i++)
4899 Lisp_Object initial_charset
4900 = CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i);
4901 iso2022_designate (initial_charset, i, str, dst);
4906 /************************************************************************/
4907 /* No-conversion methods */
4908 /************************************************************************/
4910 /* This is used when reading in "binary" files -- i.e. files that may
4911 contain all 256 possible byte values and that are not to be
4912 interpreted as being in any particular decoding. */
4914 decode_coding_no_conversion (Lstream *decoding, CONST unsigned char *src,
4915 unsigned_char_dynarr *dst, unsigned int n)
4918 struct decoding_stream *str = DECODING_STREAM_DATA (decoding);
4919 unsigned int flags = str->flags;
4920 unsigned int ch = str->ch;
4921 eol_type_t eol_type = str->eol_type;
4927 DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst);
4928 DECODE_ADD_BINARY_CHAR (c, dst);
4929 label_continue_loop:;
4932 DECODE_HANDLE_END_OF_CONVERSION (flags, ch, dst);
4939 encode_coding_no_conversion (Lstream *encoding, CONST unsigned char *src,
4940 unsigned_char_dynarr *dst, unsigned int n)
4943 struct encoding_stream *str = ENCODING_STREAM_DATA (encoding);
4944 unsigned int flags = str->flags;
4945 unsigned int ch = str->ch;
4946 eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys);
4948 unsigned char char_boundary = str->iso2022.current_char_boundary;
4955 if (char_boundary == 0)
4961 else if ( c >= 0xf8 )
4966 else if ( c >= 0xf0 )
4971 else if ( c >= 0xe0 )
4976 else if ( c >= 0xc0 )
4986 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
4987 Dynarr_add (dst, '\r');
4988 if (eol_type != EOL_CR)
4989 Dynarr_add (dst, c);
4992 Dynarr_add (dst, c);
4995 else if (char_boundary == 1)
4997 ch = ( ch << 6 ) | ( c & 0x3f );
4998 Dynarr_add (dst, ch & 0xff);
5003 ch = ( ch << 6 ) | ( c & 0x3f );
5006 #else /* not UTF2000 */
5009 if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT)
5010 Dynarr_add (dst, '\r');
5011 if (eol_type != EOL_CR)
5012 Dynarr_add (dst, '\n');
5015 else if (BYTE_ASCII_P (c))
5018 Dynarr_add (dst, c);
5020 else if (BUFBYTE_LEADING_BYTE_P (c))
5023 if (c == LEADING_BYTE_LATIN_ISO8859_1 ||
5024 c == LEADING_BYTE_CONTROL_1)
5027 Dynarr_add (dst, '~'); /* untranslatable character */
5031 if (ch == LEADING_BYTE_LATIN_ISO8859_1)
5032 Dynarr_add (dst, c);
5033 else if (ch == LEADING_BYTE_CONTROL_1)
5036 Dynarr_add (dst, c - 0x20);
5038 /* else it should be the second or third byte of an
5039 untranslatable character, so ignore it */
5042 #endif /* not UTF2000 */
5048 str->iso2022.current_char_boundary = char_boundary;
5053 /************************************************************************/
5054 /* Simple internal/external functions */
5055 /************************************************************************/
5057 static Extbyte_dynarr *conversion_out_dynarr;
5058 static Bufbyte_dynarr *conversion_in_dynarr;
5060 /* Determine coding system from coding format */
5062 /* #### not correct for all values of `fmt'! */
5064 external_data_format_to_coding_system (enum external_data_format fmt)
5068 case FORMAT_FILENAME:
5069 case FORMAT_TERMINAL:
5070 if (EQ (Vfile_name_coding_system, Qnil) ||
5071 EQ (Vfile_name_coding_system, Qbinary))
5074 return Fget_coding_system (Vfile_name_coding_system);
5077 return Fget_coding_system (Qctext);
5085 convert_to_external_format (CONST Bufbyte *ptr,
5088 enum external_data_format fmt)
5090 Lisp_Object coding_system = external_data_format_to_coding_system (fmt);
5092 if (!conversion_out_dynarr)
5093 conversion_out_dynarr = Dynarr_new (Extbyte);
5095 Dynarr_reset (conversion_out_dynarr);
5097 if (NILP (coding_system))
5099 CONST Bufbyte *end = ptr + len;
5105 (*ptr < 0xc0) ? *ptr :
5106 ((*ptr & 0x1f) << 6) | (*(ptr+1) & 0x3f);
5109 (BYTE_ASCII_P (*ptr)) ? *ptr :
5110 (*ptr == LEADING_BYTE_CONTROL_1) ? (*(ptr+1) - 0x20) :
5111 (*ptr == LEADING_BYTE_LATIN_ISO8859_1) ? (*(ptr+1)) :
5114 Dynarr_add (conversion_out_dynarr, (Extbyte) c);
5118 #ifdef ERROR_CHECK_BUFPOS
5119 assert (ptr == end);
5124 Lisp_Object instream, outstream, da_outstream;
5125 Lstream *istr, *ostr;
5126 struct gcpro gcpro1, gcpro2, gcpro3;
5127 char tempbuf[1024]; /* some random amount */
5129 instream = make_fixed_buffer_input_stream ((unsigned char *) ptr, len);
5130 da_outstream = make_dynarr_output_stream
5131 ((unsigned_char_dynarr *) conversion_out_dynarr);
5133 make_encoding_output_stream (XLSTREAM (da_outstream), coding_system);
5134 istr = XLSTREAM (instream);
5135 ostr = XLSTREAM (outstream);
5136 GCPRO3 (instream, outstream, da_outstream);
5139 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
5142 Lstream_write (ostr, tempbuf, size_in_bytes);
5144 Lstream_close (istr);
5145 Lstream_close (ostr);
5147 Lstream_delete (istr);
5148 Lstream_delete (ostr);
5149 Lstream_delete (XLSTREAM (da_outstream));
5152 *len_out = Dynarr_length (conversion_out_dynarr);
5153 Dynarr_add (conversion_out_dynarr, 0); /* remember to zero-terminate! */
5154 return Dynarr_atp (conversion_out_dynarr, 0);
5158 convert_from_external_format (CONST Extbyte *ptr,
5161 enum external_data_format fmt)
5163 Lisp_Object coding_system = external_data_format_to_coding_system (fmt);
5165 if (!conversion_in_dynarr)
5166 conversion_in_dynarr = Dynarr_new (Bufbyte);
5168 Dynarr_reset (conversion_in_dynarr);
5170 if (NILP (coding_system))
5172 CONST Extbyte *end = ptr + len;
5173 for (; ptr < end; ptr++)
5176 DECODE_ADD_BINARY_CHAR (c, conversion_in_dynarr);
5181 Lisp_Object instream, outstream, da_outstream;
5182 Lstream *istr, *ostr;
5183 struct gcpro gcpro1, gcpro2, gcpro3;
5184 char tempbuf[1024]; /* some random amount */
5186 instream = make_fixed_buffer_input_stream ((unsigned char *) ptr, len);
5187 da_outstream = make_dynarr_output_stream
5188 ((unsigned_char_dynarr *) conversion_in_dynarr);
5190 make_decoding_output_stream (XLSTREAM (da_outstream), coding_system);
5191 istr = XLSTREAM (instream);
5192 ostr = XLSTREAM (outstream);
5193 GCPRO3 (instream, outstream, da_outstream);
5196 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
5199 Lstream_write (ostr, tempbuf, size_in_bytes);
5201 Lstream_close (istr);
5202 Lstream_close (ostr);
5204 Lstream_delete (istr);
5205 Lstream_delete (ostr);
5206 Lstream_delete (XLSTREAM (da_outstream));
5209 *len_out = Dynarr_length (conversion_in_dynarr);
5210 Dynarr_add (conversion_in_dynarr, 0); /* remember to zero-terminate! */
5211 return Dynarr_atp (conversion_in_dynarr, 0);
5215 /************************************************************************/
5216 /* Initialization */
5217 /************************************************************************/
5220 syms_of_file_coding (void)
5222 defsymbol (&Qbuffer_file_coding_system, "buffer-file-coding-system");
5223 deferror (&Qcoding_system_error, "coding-system-error",
5224 "Coding-system error", Qio_error);
5226 DEFSUBR (Fcoding_system_p);
5227 DEFSUBR (Ffind_coding_system);
5228 DEFSUBR (Fget_coding_system);
5229 DEFSUBR (Fcoding_system_list);
5230 DEFSUBR (Fcoding_system_name);
5231 DEFSUBR (Fmake_coding_system);
5232 DEFSUBR (Fcopy_coding_system);
5233 DEFSUBR (Fdefine_coding_system_alias);
5234 DEFSUBR (Fsubsidiary_coding_system);
5236 DEFSUBR (Fcoding_system_type);
5237 DEFSUBR (Fcoding_system_doc_string);
5239 DEFSUBR (Fcoding_system_charset);
5241 DEFSUBR (Fcoding_system_property);
5243 DEFSUBR (Fcoding_category_list);
5244 DEFSUBR (Fset_coding_priority_list);
5245 DEFSUBR (Fcoding_priority_list);
5246 DEFSUBR (Fset_coding_category_system);
5247 DEFSUBR (Fcoding_category_system);
5249 DEFSUBR (Fdetect_coding_region);
5250 DEFSUBR (Fdecode_coding_region);
5251 DEFSUBR (Fencode_coding_region);
5253 DEFSUBR (Fdecode_shift_jis_char);
5254 DEFSUBR (Fencode_shift_jis_char);
5255 DEFSUBR (Fdecode_big5_char);
5256 DEFSUBR (Fencode_big5_char);
5258 defsymbol (&Qcoding_system_p, "coding-system-p");
5259 defsymbol (&Qno_conversion, "no-conversion");
5260 defsymbol (&Qraw_text, "raw-text");
5262 defsymbol (&Qbig5, "big5");
5263 defsymbol (&Qshift_jis, "shift-jis");
5264 defsymbol (&Qucs4, "ucs-4");
5265 defsymbol (&Qutf8, "utf-8");
5266 defsymbol (&Qccl, "ccl");
5267 defsymbol (&Qiso2022, "iso2022");
5269 defsymbol (&Qmnemonic, "mnemonic");
5270 defsymbol (&Qeol_type, "eol-type");
5271 defsymbol (&Qpost_read_conversion, "post-read-conversion");
5272 defsymbol (&Qpre_write_conversion, "pre-write-conversion");
5274 defsymbol (&Qcr, "cr");
5275 defsymbol (&Qlf, "lf");
5276 defsymbol (&Qcrlf, "crlf");
5277 defsymbol (&Qeol_cr, "eol-cr");
5278 defsymbol (&Qeol_lf, "eol-lf");
5279 defsymbol (&Qeol_crlf, "eol-crlf");
5281 defsymbol (&Qcharset_g0, "charset-g0");
5282 defsymbol (&Qcharset_g1, "charset-g1");
5283 defsymbol (&Qcharset_g2, "charset-g2");
5284 defsymbol (&Qcharset_g3, "charset-g3");
5285 defsymbol (&Qforce_g0_on_output, "force-g0-on-output");
5286 defsymbol (&Qforce_g1_on_output, "force-g1-on-output");
5287 defsymbol (&Qforce_g2_on_output, "force-g2-on-output");
5288 defsymbol (&Qforce_g3_on_output, "force-g3-on-output");
5289 defsymbol (&Qno_iso6429, "no-iso6429");
5290 defsymbol (&Qinput_charset_conversion, "input-charset-conversion");
5291 defsymbol (&Qoutput_charset_conversion, "output-charset-conversion");
5293 defsymbol (&Qshort, "short");
5294 defsymbol (&Qno_ascii_eol, "no-ascii-eol");
5295 defsymbol (&Qno_ascii_cntl, "no-ascii-cntl");
5296 defsymbol (&Qseven, "seven");
5297 defsymbol (&Qlock_shift, "lock-shift");
5298 defsymbol (&Qescape_quoted, "escape-quoted");
5300 defsymbol (&Qencode, "encode");
5301 defsymbol (&Qdecode, "decode");
5304 defsymbol (&Qctext, "ctext");
5305 defsymbol (&coding_category_symbol[CODING_CATEGORY_SHIFT_JIS],
5307 defsymbol (&coding_category_symbol[CODING_CATEGORY_BIG5],
5309 defsymbol (&coding_category_symbol[CODING_CATEGORY_UCS4],
5311 defsymbol (&coding_category_symbol[CODING_CATEGORY_UTF8],
5313 defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_7],
5315 defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_8_DESIGNATE],
5317 defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_8_1],
5319 defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_8_2],
5321 defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_LOCK_SHIFT],
5324 defsymbol (&coding_category_symbol[CODING_CATEGORY_NO_CONVERSION],
5329 lstream_type_create_file_coding (void)
5331 LSTREAM_HAS_METHOD (decoding, reader);
5332 LSTREAM_HAS_METHOD (decoding, writer);
5333 LSTREAM_HAS_METHOD (decoding, rewinder);
5334 LSTREAM_HAS_METHOD (decoding, seekable_p);
5335 LSTREAM_HAS_METHOD (decoding, flusher);
5336 LSTREAM_HAS_METHOD (decoding, closer);
5337 LSTREAM_HAS_METHOD (decoding, marker);
5339 LSTREAM_HAS_METHOD (encoding, reader);
5340 LSTREAM_HAS_METHOD (encoding, writer);
5341 LSTREAM_HAS_METHOD (encoding, rewinder);
5342 LSTREAM_HAS_METHOD (encoding, seekable_p);
5343 LSTREAM_HAS_METHOD (encoding, flusher);
5344 LSTREAM_HAS_METHOD (encoding, closer);
5345 LSTREAM_HAS_METHOD (encoding, marker);
5349 vars_of_file_coding (void)
5353 /* Initialize to something reasonable ... */
5354 for (i = 0; i <= CODING_CATEGORY_LAST; i++)
5356 coding_category_system[i] = Qnil;
5357 coding_category_by_priority[i] = i;
5360 Fprovide (intern ("file-coding"));
5362 DEFVAR_LISP ("keyboard-coding-system", &Vkeyboard_coding_system /*
5363 Coding system used for TTY keyboard input.
5364 Not used under a windowing system.
5366 Vkeyboard_coding_system = Qnil;
5368 DEFVAR_LISP ("terminal-coding-system", &Vterminal_coding_system /*
5369 Coding system used for TTY display output.
5370 Not used under a windowing system.
5372 Vterminal_coding_system = Qnil;
5374 DEFVAR_LISP ("coding-system-for-read", &Vcoding_system_for_read /*
5375 Overriding coding system used when writing a file or process.
5376 You should *bind* this, not set it. If this is non-nil, it specifies
5377 the coding system that will be used when a file or process is read
5378 in, and overrides `buffer-file-coding-system-for-read',
5379 `insert-file-contents-pre-hook', etc. Use those variables instead of
5380 this one for permanent changes to the environment.
5382 Vcoding_system_for_read = Qnil;
5384 DEFVAR_LISP ("coding-system-for-write",
5385 &Vcoding_system_for_write /*
5386 Overriding coding system used when writing a file or process.
5387 You should *bind* this, not set it. If this is non-nil, it specifies
5388 the coding system that will be used when a file or process is wrote
5389 in, and overrides `buffer-file-coding-system',
5390 `write-region-pre-hook', etc. Use those variables instead of this one
5391 for permanent changes to the environment.
5393 Vcoding_system_for_write = Qnil;
5395 DEFVAR_LISP ("file-name-coding-system", &Vfile_name_coding_system /*
5396 Coding system used to convert pathnames when accessing files.
5398 Vfile_name_coding_system = Qnil;
5400 DEFVAR_BOOL ("enable-multibyte-characters", &enable_multibyte_characters /*
5401 Non-nil means the buffer contents are regarded as multi-byte form
5402 of characters, not a binary code. This affects the display, file I/O,
5403 and behaviors of various editing commands.
5405 Setting this to nil does not do anything.
5407 enable_multibyte_characters = 1;
5411 complex_vars_of_file_coding (void)
5413 staticpro (&Vcoding_system_hash_table);
5414 Vcoding_system_hash_table =
5415 make_lisp_hash_table (50, HASH_TABLE_NON_WEAK, HASH_TABLE_EQ);
5417 the_codesys_prop_dynarr = Dynarr_new (codesys_prop);
5419 #define DEFINE_CODESYS_PROP(Prop_Type, Sym) do \
5421 struct codesys_prop csp; \
5423 csp.prop_type = (Prop_Type); \
5424 Dynarr_add (the_codesys_prop_dynarr, csp); \
5427 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qmnemonic);
5428 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_type);
5429 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_cr);
5430 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_crlf);
5431 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_lf);
5432 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qpost_read_conversion);
5433 DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qpre_write_conversion);
5435 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g0);
5436 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g1);
5437 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g2);
5438 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g3);
5439 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g0_on_output);
5440 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g1_on_output);
5441 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g2_on_output);
5442 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g3_on_output);
5443 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qshort);
5444 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qno_ascii_eol);
5445 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qno_ascii_cntl);
5446 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qseven);
5447 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qlock_shift);
5448 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qno_iso6429);
5449 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qescape_quoted);
5450 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qinput_charset_conversion);
5451 DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qoutput_charset_conversion);
5453 DEFINE_CODESYS_PROP (CODESYS_PROP_CCL, Qencode);
5454 DEFINE_CODESYS_PROP (CODESYS_PROP_CCL, Qdecode);
5456 /* Need to create this here or we're really screwed. */
5458 (Qraw_text, Qno_conversion,
5459 build_string ("Raw text, which means it converts only line-break-codes."),
5460 list2 (Qmnemonic, build_string ("Raw")));
5463 (Qbinary, Qno_conversion,
5464 build_string ("Binary, which means it does not convert anything."),
5465 list4 (Qeol_type, Qlf,
5466 Qmnemonic, build_string ("Binary")));
5471 build_string ("Coding-system of ISO/IEC 10646 UTF-8."),
5472 list2 (Qmnemonic, build_string ("UTF8")));
5475 Fdefine_coding_system_alias (Qno_conversion, Qraw_text);
5477 /* Need this for bootstrapping */
5478 coding_category_system[CODING_CATEGORY_NO_CONVERSION] =
5479 Fget_coding_system (Qraw_text);
5482 coding_category_system[CODING_CATEGORY_UTF8]
5483 = Fget_coding_system (Qutf8);