b97e5427 |
1 | /* |
2 | * iso2022.c - support for ISO/IEC 2022 (alias ECMA-35). |
3 | * |
4 | * This isn't a complete implementation of ISO/IEC 2022, but it's |
5 | * close. It only handles decoding, because a fully general encoder |
6 | * isn't really useful. It can decode 8-bit and 7-bit versions, with |
7 | * support for single-byte and multi-byte character sets, all four |
8 | * containers (G0, G1, G2, and G3), using both single-shift and |
9 | * locking-shift sequences. |
10 | * |
11 | * The general principle is that any valid ISO/IEC 2022 sequence |
12 | * should either be correctly decoded or should emit an ERROR. The |
13 | * only exception to this is that the C0 and C1 sets are fixed as |
14 | * those of ISO/IEC 6429. Escape sequences for designating control |
15 | * sets are passed through, so a post-processor could fix them up if |
16 | * necessary. |
17 | * |
c69732bb |
18 | * DOCS to UTF-8 works. Other DOCS sequences are ignored, which will |
19 | * produce surprising results. |
b97e5427 |
20 | */ |
21 | |
22 | #ifndef ENUM_CHARSETS |
23 | |
24 | #include <assert.h> |
25 | |
26 | #include "charset.h" |
27 | #include "internal.h" |
28 | #include "sbcsdat.h" |
29 | |
30 | #define LS1 (0x0E) |
31 | #define LS0 (0x0F) |
32 | #define ESC (0x1B) |
33 | #define SS2 (0x8E) |
34 | #define SS3 (0x8F) |
35 | |
36 | enum {S4, S6, M4, M6}; |
37 | |
28b8e668 |
38 | static long int emacs_big5_1_to_unicode(int, int); |
39 | static long int emacs_big5_2_to_unicode(int, int); |
113375ca |
40 | static long int cns11643_1_to_unicode(int, int); |
41 | static long int cns11643_2_to_unicode(int, int); |
42 | static long int cns11643_3_to_unicode(int, int); |
43 | static long int cns11643_4_to_unicode(int, int); |
44 | static long int cns11643_5_to_unicode(int, int); |
45 | static long int cns11643_6_to_unicode(int, int); |
46 | static long int cns11643_7_to_unicode(int, int); |
b97e5427 |
47 | static long int null_dbcs_to_unicode(int, int); |
48 | |
49 | const struct iso2022_subcharset { |
50 | char type, i, f; |
51 | int offset; |
52 | const sbcs_data *sbcs_base; |
53 | long int (*dbcs_fn)(int, int); |
54 | } iso2022_subcharsets[] = { |
294941fa |
55 | { S4, 0, '0', 0x00, &sbcsdata_CS_DEC_GRAPHICS }, |
b97e5427 |
56 | { S4, 0, '<', 0x80, &sbcsdata_CS_DEC_MCS }, |
294941fa |
57 | { S4, 0, 'A', 0x00, &sbcsdata_CS_BS4730 }, |
58 | { S4, 0, 'B', 0x00, &sbcsdata_CS_ASCII }, |
b97e5427 |
59 | { S4, 0, 'I', 0x80, &sbcsdata_CS_JISX0201 }, |
60 | { S4, 0, 'J', 0x00, &sbcsdata_CS_JISX0201 }, |
61 | { S4, 0, '~' }, |
62 | { S6, 0, 'A', 0x80, &sbcsdata_CS_ISO8859_1 }, |
63 | { S6, 0, 'B', 0x80, &sbcsdata_CS_ISO8859_2 }, |
64 | { S6, 0, 'C', 0x80, &sbcsdata_CS_ISO8859_3 }, |
65 | { S6, 0, 'D', 0x80, &sbcsdata_CS_ISO8859_4 }, |
66 | { S6, 0, 'F', 0x80, &sbcsdata_CS_ISO8859_7 }, |
67 | { S6, 0, 'G', 0x80, &sbcsdata_CS_ISO8859_6 }, |
68 | { S6, 0, 'H', 0x80, &sbcsdata_CS_ISO8859_8 }, |
69 | { S6, 0, 'L', 0x80, &sbcsdata_CS_ISO8859_5 }, |
70 | { S6, 0, 'M', 0x80, &sbcsdata_CS_ISO8859_9 }, |
71 | { S6, 0, 'T', 0x80, &sbcsdata_CS_ISO8859_11 }, |
72 | { S6, 0, 'V', 0x80, &sbcsdata_CS_ISO8859_10 }, |
73 | { S6, 0, 'Y', 0x80, &sbcsdata_CS_ISO8859_13 }, |
74 | { S6, 0, '_', 0x80, &sbcsdata_CS_ISO8859_14 }, |
75 | { S6, 0, 'b', 0x80, &sbcsdata_CS_ISO8859_15 }, |
76 | { S6, 0, 'f', 0x80, &sbcsdata_CS_ISO8859_16 }, |
77 | { S6, 0, '~' }, /* empty 96-set */ |
78 | #if 0 |
79 | { M4, 0, '@' }, /* JIS C 6226-1978 */ |
80 | #endif |
28b8e668 |
81 | { M4, 0, '0', -0x21, 0, &emacs_big5_1_to_unicode }, |
82 | { M4, 0, '1', -0x21, 0, &emacs_big5_2_to_unicode }, |
b97e5427 |
83 | { M4, 0, 'A', -0x21, 0, &gb2312_to_unicode }, |
84 | { M4, 0, 'B', -0x21, 0, &jisx0208_to_unicode }, |
85 | { M4, 0, 'C', -0x21, 0, &ksx1001_to_unicode }, |
86 | { M4, 0, 'D', -0x21, 0, &jisx0212_to_unicode }, |
113375ca |
87 | { M4, 0, 'G', -0x21, 0, &cns11643_1_to_unicode }, |
88 | { M4, 0, 'H', -0x21, 0, &cns11643_2_to_unicode }, |
89 | { M4, 0, 'I', -0x21, 0, &cns11643_3_to_unicode }, |
90 | { M4, 0, 'J', -0x21, 0, &cns11643_4_to_unicode }, |
91 | { M4, 0, 'K', -0x21, 0, &cns11643_5_to_unicode }, |
92 | { M4, 0, 'L', -0x21, 0, &cns11643_6_to_unicode }, |
93 | { M4, 0, 'M', -0x21, 0, &cns11643_7_to_unicode }, |
b97e5427 |
94 | { M4, 0, '~', 0, 0, &null_dbcs_to_unicode }, /* empty 94^n-set */ |
95 | { M6, 0, '~', 0, 0, &null_dbcs_to_unicode }, /* empty 96^n-set */ |
96 | }; |
97 | |
98 | static long int null_dbcs_to_unicode(int r, int c) |
99 | { |
100 | return ERROR; |
101 | } |
102 | |
28b8e668 |
103 | /* |
104 | * Emacs encodes Big5 in COMPOUND_TEXT as two 94x94 character sets. |
105 | * We treat Big5 as a 94x191 character set with a bunch of undefined |
106 | * columns in the middle, so we have to mess around a bit to make |
107 | * things fit. |
108 | */ |
109 | |
110 | static long int emacs_big5_1_to_unicode(int r, int c) |
111 | { |
112 | unsigned long s; |
113 | s = r * 94 + c; |
114 | r = s / 157; |
115 | c = s % 157; |
116 | if (c >= 64) c += 34; /* Skip over the gap */ |
117 | return big5_to_unicode(r, c); |
118 | } |
119 | |
120 | static long int emacs_big5_2_to_unicode(int r, int c) |
121 | { |
122 | unsigned long s; |
123 | s = r * 94 + c; |
124 | r = s / 157 + 40; |
125 | c = s % 157; |
126 | if (c >= 64) c += 34; /* Skip over the gap */ |
127 | return big5_to_unicode(r, c); |
128 | } |
129 | |
113375ca |
130 | /* Wrappers for cns11643_to_unicode() */ |
131 | static long int cns11643_1_to_unicode(int r, int c) |
132 | { |
133 | return cns11643_to_unicode(0, r, c); |
134 | } |
135 | static long int cns11643_2_to_unicode(int r, int c) |
136 | { |
137 | return cns11643_to_unicode(1, r, c); |
138 | } |
139 | static long int cns11643_3_to_unicode(int r, int c) |
140 | { |
141 | return cns11643_to_unicode(2, r, c); |
142 | } |
143 | static long int cns11643_4_to_unicode(int r, int c) |
144 | { |
145 | return cns11643_to_unicode(3, r, c); |
146 | } |
147 | static long int cns11643_5_to_unicode(int r, int c) |
148 | { |
149 | return cns11643_to_unicode(4, r, c); |
150 | } |
151 | static long int cns11643_6_to_unicode(int r, int c) |
152 | { |
153 | return cns11643_to_unicode(5, r, c); |
154 | } |
155 | static long int cns11643_7_to_unicode(int r, int c) |
156 | { |
157 | return cns11643_to_unicode(6, r, c); |
158 | } |
28b8e668 |
159 | |
b97e5427 |
160 | /* States, or "what we're currently accumulating". */ |
161 | enum { |
162 | IDLE, /* None of the below */ |
163 | SS2CHAR, /* Accumulating a character after SS2 */ |
164 | SS3CHAR, /* Accumulating a character after SS3 */ |
165 | ESCSEQ, /* Accumulating an escape sequence */ |
166 | ESCDROP, /* Discarding an escape sequence */ |
a89fe3cf |
167 | ESCPASS, /* Passing through an escape sequence */ |
c6cef4fa |
168 | DOCSUTF8, /* DOCSed into UTF-8 */ |
169 | DOCSCTEXT /* DOCSed into a COMPOUND_TEXT extended segment */ |
b97e5427 |
170 | }; |
171 | |
a2c43a72 |
172 | #if 0 |
b97e5427 |
173 | #include <stdio.h> |
174 | static void dump_state(charset_state *s) |
175 | { |
176 | unsigned s0 = s->s0, s1 = s->s1; |
177 | char const * const modes[] = { "IDLE", "SS2CHAR", "SS3CHAR", |
a89fe3cf |
178 | "ESCSEQ", "ESCDROP", "ESCPASS", |
179 | "DOCSUTF8" }; |
b97e5427 |
180 | |
181 | fprintf(stderr, "s0: %s", modes[s0 >> 29]); |
182 | fprintf(stderr, " %02x %02x %02x ", (s0 >> 16) & 0xff, (s0 >> 8) & 0xff, |
183 | s0 & 0xff); |
184 | fprintf(stderr, "s1: LS%d LS%dR", (s1 >> 30) & 3, (s1 >> 28) & 3); |
185 | fprintf(stderr, " %d %d %d %d\n", s1 & 0x7f, (s1 >> 7) & 0x7f, |
186 | (s1 >> 14) & 0x7f, (s1 >> 21) & 0x7f); |
187 | } |
188 | #endif |
189 | |
190 | static void designate(charset_state *state, int container, |
191 | int type, int ibyte, int fbyte) |
192 | { |
193 | unsigned long i; |
194 | |
195 | assert(container >= 0 && container <= 3); |
196 | assert(type == S4 || type == S6 || type == M4 || type == M6); |
197 | |
198 | for (i = 0; i <= lenof(iso2022_subcharsets); i++) { |
199 | if (iso2022_subcharsets[i].type == type && |
200 | iso2022_subcharsets[i].i == ibyte && |
201 | iso2022_subcharsets[i].f == fbyte) { |
202 | state->s1 &= ~(0x7fL << (container * 7)); |
203 | state->s1 |= (i << (container * 7)); |
204 | return; |
205 | } |
206 | } |
207 | /* |
208 | * If we don't find the charset, invoke the empty one, so we |
209 | * output ERROR rather than garbage. |
210 | */ |
211 | designate(state, container, type, 0, '~'); |
212 | } |
213 | |
a89fe3cf |
214 | static void do_utf8(long int input_chr, |
215 | charset_state *state, |
216 | void (*emit)(void *ctx, long int output), |
217 | void *emitctx) |
218 | { |
219 | charset_state ustate; |
a89fe3cf |
220 | |
221 | ustate.s1 = 0; |
222 | ustate.s0 = state->s0 & 0x03ffffffL; |
7a7dc0a7 |
223 | read_utf8(NULL, input_chr, &ustate, emit, emitctx); |
a89fe3cf |
224 | state->s0 = (state->s0 & ~0x03ffffffL) | (ustate.s0 & 0x03ffffffL); |
225 | } |
226 | |
227 | static void docs_utf8(long int input_chr, |
228 | charset_state *state, |
229 | void (*emit)(void *ctx, long int output), |
230 | void *emitctx) |
231 | { |
232 | int retstate; |
233 | |
234 | /* |
235 | * Bits [25:0] of s0 are reserved for read_utf8(). |
236 | * Bits [27:26] are a tiny state machine to recognise ESC % @. |
237 | */ |
238 | retstate = (state->s0 & 0x0c000000L) >> 26; |
239 | if (retstate == 1 && input_chr == '%') |
240 | retstate = 2; |
241 | else if (retstate == 2 && input_chr == '@') { |
242 | /* If we've got a partial UTF-8 sequence, complain. */ |
243 | if (state->s0 & 0x03ffffffL) |
244 | emit(emitctx, ERROR); |
245 | state->s0 = 0; |
246 | return; |
247 | } else { |
248 | if (retstate >= 1) do_utf8(ESC, state, emit, emitctx); |
249 | if (retstate >= 2) do_utf8('%', state, emit, emitctx); |
250 | retstate = 0; |
251 | if (input_chr == ESC) |
252 | retstate = 1; |
253 | else { |
254 | do_utf8(input_chr, state, emit, emitctx); |
255 | } |
256 | } |
257 | state->s0 = (state->s0 & ~0x0c000000L) | (retstate << 26); |
258 | } |
259 | |
c6cef4fa |
260 | struct ctext_encoding { |
261 | char const *name; |
262 | charset_spec const *subcs; |
263 | }; |
264 | |
265 | /* |
266 | * In theory, this list is in <http://ftp.x.org/pub/docs/registry>, |
267 | * but XLib appears to have its own ideas, and encodes these three |
268 | * (as of X11R6.8.2) |
269 | */ |
270 | |
271 | extern charset_spec const charset_CS_ISO8859_14; |
272 | extern charset_spec const charset_CS_ISO8859_15; |
273 | extern charset_spec const charset_CS_BIG5; |
274 | |
275 | static struct ctext_encoding const ctext_encodings[] = { |
276 | { "big5-0\2", &charset_CS_BIG5 }, |
277 | { "iso8859-14\2", &charset_CS_ISO8859_14 }, |
278 | { "iso8859-15\2", &charset_CS_ISO8859_15 } |
279 | }; |
280 | |
281 | static void docs_ctext(long int input_chr, |
282 | charset_state *state, |
283 | void (*emit)(void *ctx, long int output), |
284 | void *emitctx) |
285 | { |
286 | /* |
287 | * s0[27:26] = first entry in ctext_encodings that matches |
288 | * s0[25:22] = number of characters successfully matched, 0xf if all |
289 | * s0[21:8] count the number of octets left in the segment |
290 | * s0[7:0] are for sub-charset use |
291 | */ |
292 | int n = (state->s0 >> 22) & 0xf, i = (state->s0 >> 26) & 3, oi = i, j; |
293 | int length = (state->s0 >> 8) & 0x3fff; |
294 | |
295 | if (!length) { |
296 | /* Haven't read length yet */ |
297 | if ((state->s0 & 0xff) == 0) |
298 | /* ... or even the first byte */ |
299 | state->s0 |= input_chr; |
300 | else { |
301 | length = (state->s0 & 0x7f) * 0x80 + (input_chr & 0x7f); |
302 | if (length == 0) |
303 | state->s0 = 0; |
304 | else |
305 | state->s0 = (state->s0 & 0xf0000000) | (length << 8); |
306 | } |
307 | return; |
308 | } |
309 | |
310 | j = i; |
311 | if (n == 0xe) { |
312 | /* Skipping unknown encoding. Look out for STX. */ |
313 | if (input_chr == 2) |
314 | state->s0 = (state->s0 & 0xf0000000) | (i << 26) | (0xf << 22); |
315 | } else if (n != 0xf) { |
316 | while (j < lenof(ctext_encodings) && |
317 | !memcmp(ctext_encodings[j].name, |
318 | ctext_encodings[oi].name, n)) { |
319 | if (ctext_encodings[j].name[n] < input_chr) |
320 | i = ++j; |
321 | else |
322 | break; |
323 | } |
324 | if (i >= lenof(ctext_encodings) || |
325 | memcmp(ctext_encodings[i].name, |
326 | ctext_encodings[oi].name, n) || |
327 | ctext_encodings[i].name[n] != input_chr) { |
328 | /* Doom! We haven't heard of this encoding */ |
329 | i = lenof(ctext_encodings); |
330 | n = 0xe; |
331 | } else { |
332 | /* |
333 | * Otherwise, we have found an additional character in our |
334 | * encoding name. See if we have reached the _end_ of our |
335 | * name. |
336 | */ |
337 | n++; |
338 | if (!ctext_encodings[i].name[n]) |
339 | n = 0xf; |
340 | } |
341 | /* |
342 | * Failing _that_, we simply update our encoding-name- |
343 | * tracking state. |
344 | */ |
345 | assert(i < 4 && n < 16); |
346 | state->s0 = (state->s0 & 0xf0000000) | (i << 26) | (n << 22); |
347 | } else { |
348 | if (i >= lenof(ctext_encodings)) |
349 | emit(emitctx, ERROR); |
350 | else { |
351 | charset_state substate; |
352 | charset_spec const *subcs = ctext_encodings[i].subcs; |
353 | substate.s1 = 0; |
354 | substate.s0 = state->s0 & 0xff; |
355 | subcs->read(subcs, input_chr, &substate, emit, emitctx); |
356 | state->s0 = (state->s0 & ~0xff) | (substate.s0 & 0xff); |
357 | } |
358 | } |
359 | if (!--length) |
360 | state->s0 = 0; |
361 | else |
362 | state->s0 = (state->s0 &~0x003fff00) | (length << 8); |
363 | } |
a89fe3cf |
364 | |
b97e5427 |
365 | static void read_iso2022(charset_spec const *charset, long int input_chr, |
366 | charset_state *state, |
367 | void (*emit)(void *ctx, long int output), |
368 | void *emitctx) |
369 | { |
370 | |
a89fe3cf |
371 | /* dump_state(state); */ |
b97e5427 |
372 | /* |
04c24cbb |
373 | * We have to make fairly efficient use of the 64 bits of state |
0fab6a2b |
374 | * available to us. Long-term state goes in s1, and consists of |
04c24cbb |
375 | * the identities of the character sets designated as G0/G1/G2/G3 |
376 | * and the locking-shift states for GL and GR. Short-term state |
0fab6a2b |
377 | * goes in s0: The bottom half of s0 accumulates characters for an |
04c24cbb |
378 | * escape sequence or a multi-byte character, while the top three |
379 | * bits indicate what they're being accumulated for. After DOCS, |
380 | * the bottom 29 bits of state are available for the DOCS function |
381 | * to use -- the UTF-8 one uses the bottom 26 for UTF-8 decoding |
382 | * and the top two to recognised ESC % @. |
b97e5427 |
383 | * |
384 | * s0[31:29] = state enum |
385 | * s0[24:0] = accumulated bytes |
386 | * s1[31:30] = GL locking-shift state |
387 | * s1[29:28] = GR locking-shift state |
388 | * s1[27:21] = G3 charset |
389 | * s1[20:14] = G2 charset |
390 | * s1[13:7] = G1 charset |
391 | * s1[6:0] = G0 charset |
392 | */ |
393 | |
394 | #define LEFT 30 |
395 | #define RIGHT 28 |
396 | #define LOCKING_SHIFT(n,side) \ |
397 | (state->s1 = (state->s1 & ~(3L<<(side))) | ((n ## L)<<(side))) |
398 | #define MODE ((state->s0 & 0xe0000000L) >> 29) |
399 | #define ENTER_MODE(m) (state->s0 = (state->s0 & ~0xe0000000L) | ((m)<<29)) |
400 | #define SINGLE_SHIFT(n) ENTER_MODE(SS2CHAR - 2 + (n)) |
401 | #define ASSERT_IDLE do { \ |
402 | if (state->s0 != 0) emit(emitctx, ERROR); \ |
403 | state->s0 = 0; \ |
404 | } while (0) |
405 | |
406 | if (state->s1 == 0) { |
407 | /* |
408 | * Since there's no LS0R, this means we must just have started. |
409 | * Set up a sane initial state (LS0, LS1R, ASCII in G0/G1/G2/G3). |
410 | */ |
411 | LOCKING_SHIFT(0, LEFT); |
412 | LOCKING_SHIFT(1, RIGHT); |
413 | designate(state, 0, S4, 0, 'B'); |
414 | designate(state, 1, S4, 0, 'B'); |
415 | designate(state, 2, S4, 0, 'B'); |
416 | designate(state, 3, S4, 0, 'B'); |
417 | } |
418 | |
a89fe3cf |
419 | if (MODE == DOCSUTF8) { |
420 | docs_utf8(input_chr, state, emit, emitctx); |
421 | return; |
422 | } |
c6cef4fa |
423 | if (MODE == DOCSCTEXT) { |
424 | docs_ctext(input_chr, state, emit, emitctx); |
425 | return; |
426 | } |
a89fe3cf |
427 | |
b97e5427 |
428 | if ((input_chr & 0x60) == 0x00) { |
429 | /* C0 or C1 control */ |
430 | ASSERT_IDLE; |
431 | switch (input_chr) { |
432 | case ESC: |
433 | ENTER_MODE(ESCSEQ); |
434 | break; |
435 | case LS0: |
436 | LOCKING_SHIFT(0, LEFT); |
437 | break; |
438 | case LS1: |
439 | LOCKING_SHIFT(1, LEFT); |
440 | break; |
441 | case SS2: |
442 | SINGLE_SHIFT(2); |
443 | break; |
444 | case SS3: |
445 | SINGLE_SHIFT(3); |
446 | break; |
447 | default: |
448 | emit(emitctx, input_chr); |
449 | break; |
450 | } |
451 | } else if ((input_chr & 0x80) || MODE < ESCSEQ) { |
452 | int is_gl = 0; |
453 | struct iso2022_subcharset const *subcs; |
454 | unsigned container; |
455 | long input_7bit; |
456 | /* |
457 | * Actual data. |
458 | * Force idle state if we're in mid escape sequence, or in a |
459 | * multi-byte character with a different top bit. |
460 | */ |
461 | if (MODE >= ESCSEQ || |
462 | ((state->s0 & 0x00ff0000L) != 0 && |
463 | (((state->s0 >> 16) ^ input_chr) & 0x80))) |
464 | ASSERT_IDLE; |
465 | if (MODE == SS2CHAR || MODE == SS3CHAR) /* Single-shift */ |
466 | container = MODE - SS2CHAR + 2; |
467 | else if (input_chr >= 0x80) /* GR */ |
468 | container = (state->s1 >> 28) & 3; |
469 | else { /* GL */ |
470 | container = state->s1 >> 30; |
471 | is_gl = 1; |
472 | } |
473 | input_7bit = input_chr & ~0x80; |
474 | subcs = &iso2022_subcharsets[(state->s1 >> (container * 7)) & 0x7f]; |
475 | if ((subcs->type == S4 || subcs->type == M4) && |
476 | (input_7bit == 0x20 || input_7bit == 0x7f)) { |
477 | /* characters not in 94-char set */ |
478 | if (is_gl) emit(emitctx, input_7bit); |
479 | else emit(emitctx, ERROR); |
480 | } else if (subcs->type == M4 || subcs->type == M6) { |
481 | if ((state->s0 & 0x00ff0000L) == 0) { |
482 | state->s0 |= input_chr << 16; |
483 | return; |
484 | } else { |
485 | emit(emitctx, |
486 | subcs->dbcs_fn(((state->s0 >> 16) & 0x7f) + subcs->offset, |
487 | input_7bit + subcs->offset)); |
488 | } |
489 | } else { |
490 | if ((state->s0 & 0x00ff0000L) != 0) |
491 | emit(emitctx, ERROR); |
492 | emit(emitctx, subcs->sbcs_base ? |
493 | sbcs_to_unicode(subcs->sbcs_base, input_7bit + subcs->offset): |
494 | ERROR); |
495 | } |
496 | state->s0 = 0; |
497 | } else { |
498 | unsigned i1, i2; |
499 | if (MODE == ESCPASS) { |
500 | emit(emitctx, input_chr); |
501 | if ((input_chr & 0xf0) != 0x20) |
502 | ENTER_MODE(IDLE); |
503 | return; |
504 | } |
505 | |
506 | /* |
507 | * Intermediate bytes shall be any of the 16 positions of |
508 | * column 02 of the code table; they are denoted by the symbol |
509 | * I. |
510 | */ |
511 | if ((input_chr & 0xf0) == 0x20) { |
512 | if (((state->s0 >> 16) & 0xff) == 0) |
513 | state->s0 |= input_chr << 16; |
514 | else if (((state->s0 >> 8) & 0xff) == 0) |
515 | state->s0 |= input_chr << 8; |
516 | else { |
517 | /* Long escape sequence. Switch to ESCPASS or ESCDROP. */ |
518 | i1 = (state->s0 >> 16) & 0xff; |
519 | i2 = (state->s0 >> 8) & 0xff; |
520 | switch (i1) { |
521 | case '(': case ')': case '*': case '+': |
522 | case '-': case '.': case '/': |
523 | case '$': |
524 | ENTER_MODE(ESCDROP); |
525 | break; |
526 | default: |
527 | emit(emitctx, ESC); |
528 | emit(emitctx, i1); |
529 | emit(emitctx, i2); |
530 | emit(emitctx, input_chr); |
531 | state->s0 = 0; |
532 | ENTER_MODE(ESCPASS); |
533 | break; |
534 | } |
535 | } |
536 | return; |
537 | } |
538 | |
539 | /* |
540 | * Final bytes shall be any of the 79 positions of columns 03 |
541 | * to 07 of the code table excluding position 07/15; they are |
542 | * denoted by the symbol F. |
543 | */ |
544 | i1 = (state->s0 >> 16) & 0xff; |
545 | i2 = (state->s0 >> 8) & 0xff; |
546 | if (MODE == ESCDROP) |
547 | input_chr = 0; /* Make sure it won't match. */ |
548 | state->s0 = 0; |
549 | switch (i1) { |
550 | case 0: /* No intermediate bytes */ |
551 | switch (input_chr) { |
552 | case 'N': /* SS2 */ |
553 | SINGLE_SHIFT(2); |
554 | break; |
555 | case 'O': /* SS3 */ |
556 | SINGLE_SHIFT(3); |
557 | break; |
558 | case 'n': /* LS2 */ |
559 | LOCKING_SHIFT(2, LEFT); |
560 | break; |
561 | case 'o': /* LS3 */ |
562 | LOCKING_SHIFT(3, LEFT); |
563 | break; |
564 | case '|': /* LS3R */ |
565 | LOCKING_SHIFT(3, RIGHT); |
566 | break; |
567 | case '}': /* LS2R */ |
568 | LOCKING_SHIFT(2, RIGHT); |
569 | break; |
570 | case '~': /* LS1R */ |
571 | LOCKING_SHIFT(1, RIGHT); |
572 | break; |
573 | default: |
574 | /* Unsupported escape sequence. Spit it back out. */ |
575 | emit(emitctx, ESC); |
576 | emit(emitctx, input_chr); |
577 | } |
578 | break; |
579 | case ' ': /* ACS */ |
580 | /* |
581 | * Various coding structure facilities specify that designating |
582 | * a code element also invokes it. As far as I can see, invoking |
583 | * it now will have the same practical effect, since those |
584 | * facilities also ban the use of locking shifts. |
585 | */ |
586 | switch (input_chr) { |
587 | case 'A': /* G0 element used and invoked into GL */ |
588 | LOCKING_SHIFT(0, LEFT); |
589 | break; |
590 | case 'C': /* G0 in GL, G1 in GR */ |
591 | case 'D': /* Ditto, at least for 8-bit codes */ |
592 | case 'L': /* ISO 4873 (ECMA-43) level 1 */ |
593 | case 'M': /* ISO 4873 (ECMA-43) level 2 */ |
594 | LOCKING_SHIFT(0, LEFT); |
595 | LOCKING_SHIFT(1, RIGHT); |
596 | break; |
597 | } |
598 | break; |
599 | case '&': /* IRR */ |
600 | /* |
601 | * IRR (Identify Revised Registration) is ignored here, |
602 | * since any revised registration must be |
603 | * upward-compatible with the old one, so either we'll |
604 | * support the new one or we'll emit ERROR when we run |
605 | * into a new character. In either case, there's nothing |
606 | * to be done here. |
607 | */ |
608 | break; |
609 | case '(': /* GZD4 */ case ')': /* G1D4 */ |
610 | case '*': /* G2D4 */ case '+': /* G3D4 */ |
611 | designate(state, i1 - '(', S4, i2, input_chr); |
612 | break; |
613 | case '-': /* G1D6 */ case '.': /* G2D6 */ case '/': /* G3D6 */ |
614 | designate(state, i1 - ',', S6, i2, input_chr); |
615 | break; |
616 | case '$': /* G?DM? */ |
617 | switch (i2) { |
618 | case 0: /* Obsolete version of GZDM4 */ |
619 | i2 = '('; |
620 | case '(': /* GZDM4 */ case ')': /* G1DM4 */ |
621 | case '*': /* G2DM4 */ case '+': /* G3DM4 */ |
622 | designate(state, i2 - '(', M4, 0, input_chr); |
623 | break; |
624 | case '-': /* G1DM6 */ |
625 | case '.': /* G2DM6 */ case '/': /* G3DM6 */ |
626 | designate(state, i2 - ',', M6, 0, input_chr); |
627 | break; |
628 | default: |
629 | emit(emitctx, ERROR); |
630 | break; |
631 | } |
632 | case '%': /* DOCS */ |
a89fe3cf |
633 | /* XXX What's a reasonable way to handle an unrecognised DOCS? */ |
634 | switch (i2) { |
635 | case 0: |
636 | switch (input_chr) { |
637 | case 'G': |
638 | ENTER_MODE(DOCSUTF8); |
639 | break; |
640 | } |
641 | break; |
c6cef4fa |
642 | case '/': |
643 | switch (input_chr) { |
644 | case '1': case '2': |
645 | ENTER_MODE(DOCSCTEXT); |
646 | break; |
647 | } |
648 | break; |
a89fe3cf |
649 | } |
b97e5427 |
650 | break; |
651 | default: |
652 | /* Unsupported nF escape sequence. Re-emit it. */ |
653 | emit(emitctx, ESC); |
654 | emit(emitctx, i1); |
655 | if (i2) emit(emitctx, i2); |
656 | emit(emitctx, input_chr); |
657 | break; |
658 | } |
659 | } |
660 | } |
661 | |
04c24cbb |
662 | static int write_iso2022(charset_spec const *charset, long int input_chr, |
663 | charset_state *state, |
664 | void (*emit)(void *ctx, long int output), |
665 | void *emitctx) |
666 | { |
667 | return FALSE; |
668 | } |
669 | |
b97e5427 |
670 | const charset_spec charset_CS_ISO2022 = { |
04c24cbb |
671 | CS_ISO2022, read_iso2022, write_iso2022, NULL |
b97e5427 |
672 | }; |
673 | |
674 | #ifdef TESTMODE |
675 | |
676 | #include <stdio.h> |
677 | #include <stdarg.h> |
678 | #include <string.h> |
679 | |
680 | int total_errs = 0; |
681 | |
682 | void iso2022_emit(void *ctx, long output) |
683 | { |
684 | wchar_t **p = (wchar_t **)ctx; |
685 | *(*p)++ = output; |
686 | } |
687 | |
688 | void iso2022_read_test(int line, char *input, int inlen, ...) |
689 | { |
690 | va_list ap; |
691 | wchar_t *p, str[512]; |
692 | int i; |
693 | charset_state state; |
694 | unsigned long l; |
695 | |
696 | state.s0 = state.s1 = 0; |
697 | p = str; |
698 | |
699 | for (i = 0; i < inlen; i++) |
700 | read_iso2022(NULL, input[i] & 0xFF, &state, iso2022_emit, &p); |
701 | |
702 | va_start(ap, inlen); |
703 | l = 0; |
704 | for (i = 0; i < p - str; i++) { |
705 | l = va_arg(ap, long int); |
706 | if (l == -1) { |
707 | printf("%d: correct string shorter than output\n", line); |
708 | total_errs++; |
709 | break; |
710 | } |
711 | if (l != str[i]) { |
712 | printf("%d: char %d came out as %08x, should be %08lx\n", |
713 | line, i, str[i], l); |
714 | total_errs++; |
715 | } |
716 | } |
717 | if (l != -1) { |
718 | l = va_arg(ap, long int); |
719 | if (l != -1) { |
720 | printf("%d: correct string longer than output\n", line); |
721 | total_errs++; |
722 | } |
723 | } |
724 | va_end(ap); |
725 | } |
726 | |
727 | /* Macro to concoct the first three parameters of iso2022_read_test. */ |
728 | #define TESTSTR(x) __LINE__, x, lenof(x) |
729 | |
730 | int main(void) |
731 | { |
732 | printf("read tests beginning\n"); |
733 | /* Simple test (Emacs sample text for Japanese, in ISO-2022-JP) */ |
734 | iso2022_read_test(TESTSTR("Japanese (\x1b$BF|K\\8l\x1b(B)\t" |
735 | "\x1b$B$3$s$K$A$O\x1b(B, " |
736 | "\x1b$B%3%s%K%A%O\x1b(B\n"), |
737 | 'J','a','p','a','n','e','s','e',' ','(', |
738 | 0x65E5, 0x672C, 0x8A9E, ')', '\t', |
739 | 0x3053, 0x3093, 0x306b, 0x3061, 0x306f, ',', ' ', |
740 | 0x30b3, 0x30f3, 0x30cb, 0x30c1, 0x30cf, '\n', 0, -1); |
741 | /* Same thing in EUC-JP (with designations, and half-width katakana) */ |
742 | iso2022_read_test(TESTSTR("\x1b$)B\x1b*I\x1b$+D" |
743 | "Japanese (\xc6\xfc\xcb\xdc\xb8\xec)\t" |
744 | "\xa4\xb3\xa4\xf3\xa4\xcb\xa4\xc1\xa4\xcf, " |
745 | "\x8e\xba\x8e\xdd\x8e\xc6\x8e\xc1\x8e\xca\n"), |
746 | 'J','a','p','a','n','e','s','e',' ','(', |
747 | 0x65E5, 0x672C, 0x8A9E, ')', '\t', |
748 | 0x3053, 0x3093, 0x306b, 0x3061, 0x306f, ',', ' ', |
749 | 0xff7a, 0xff9d, 0xff86, 0xff81, 0xff8a, '\n', 0, -1); |
750 | /* Multibyte single-shift */ |
751 | iso2022_read_test(TESTSTR("\x1b$)B\x1b*I\x1b$+D\x8f\"/!"), |
752 | 0x02D8, '!', 0, -1); |
753 | /* Non-existent SBCS */ |
754 | iso2022_read_test(TESTSTR("\x1b(!Zfnord\n"), |
755 | ERROR, ERROR, ERROR, ERROR, ERROR, '\n', 0, -1); |
756 | /* Pass-through of ordinary escape sequences, including a long one */ |
757 | iso2022_read_test(TESTSTR("\x1b""b\x1b#5\x1b#!!!5"), |
758 | 0x1B, 'b', 0x1B, '#', '5', |
759 | 0x1B, '#', '!', '!', '!', '5', 0, -1); |
760 | /* Non-existent DBCS (also 5-byte escape sequence) */ |
761 | iso2022_read_test(TESTSTR("\x1b$(!Bfnord!"), |
762 | ERROR, ERROR, ERROR, 0, -1); |
763 | /* Incomplete DB characters */ |
764 | iso2022_read_test(TESTSTR("\x1b$B(,(\x1b(BHi\x1b$B(,(\n"), |
765 | 0x2501, ERROR, 'H', 'i', 0x2501, ERROR, '\n', 0, -1); |
766 | iso2022_read_test(TESTSTR("\x1b$)B\x1b*I\x1b$+D\xa4""B"), |
767 | ERROR, 'B', 0, -1); |
768 | iso2022_read_test(TESTSTR("\x1b$)B\x1b*I\x1b$+D\x0e\x1b|$\xa2\xaf"), |
769 | ERROR, 0x02D8, 0, -1); |
770 | /* Incomplete escape sequence */ |
771 | iso2022_read_test(TESTSTR("\x1b\n"), ERROR, '\n', 0, -1); |
772 | iso2022_read_test(TESTSTR("\x1b-A\x1b~\x1b\xa1"), ERROR, 0xa1, 0, -1); |
773 | /* Incomplete single-shift */ |
774 | iso2022_read_test(TESTSTR("\x8e\n"), ERROR, '\n', 0, -1); |
775 | iso2022_read_test(TESTSTR("\x1b$*B\x8e(\n"), ERROR, '\n', 0, -1); |
776 | /* Corner cases (02/00 and 07/15) */ |
777 | iso2022_read_test(TESTSTR("\x1b(B\x20\x7f"), 0x20, 0x7f, 0, -1); |
778 | iso2022_read_test(TESTSTR("\x1b(I\x20\x7f"), 0x20, 0x7f, 0, -1); |
779 | iso2022_read_test(TESTSTR("\x1b$B\x20\x7f"), 0x20, 0x7f, 0, -1); |
780 | iso2022_read_test(TESTSTR("\x1b-A\x0e\x20\x7f"), 0xa0, 0xff, 0, -1); |
781 | iso2022_read_test(TESTSTR("\x1b$-~\x0e\x20\x7f"), ERROR, 0, -1); |
782 | iso2022_read_test(TESTSTR("\x1b)B\xa0\xff"), ERROR, ERROR, 0, -1); |
783 | iso2022_read_test(TESTSTR("\x1b)I\xa0\xff"), ERROR, ERROR, 0, -1); |
784 | iso2022_read_test(TESTSTR("\x1b$)B\xa0\xff"), ERROR, ERROR, 0, -1); |
785 | iso2022_read_test(TESTSTR("\x1b-A\x1b~\xa0\xff"), 0xa0, 0xff, 0, -1); |
786 | iso2022_read_test(TESTSTR("\x1b$-~\x1b~\xa0\xff"), ERROR, 0, -1); |
787 | /* Designate control sets */ |
788 | iso2022_read_test(TESTSTR("\x1b!@"), 0x1b, '!', '@', 0, -1); |
c6cef4fa |
789 | /* Designate other coding system (UTF-8) */ |
a89fe3cf |
790 | iso2022_read_test(TESTSTR("\x1b%G" |
791 | "\xCE\xBA\xE1\xBD\xB9\xCF\x83\xCE\xBC\xCE\xB5"), |
792 | 0x03BA, 0x1F79, 0x03C3, 0x03BC, 0x03B5, 0, -1); |
793 | iso2022_read_test(TESTSTR("\x1b-A\x1b%G\xCE\xBA\x1b%@\xa0"), |
794 | 0x03BA, 0xA0, 0, -1); |
795 | iso2022_read_test(TESTSTR("\x1b%G\xCE\x1b%@"), ERROR, 0, -1); |
796 | iso2022_read_test(TESTSTR("\x1b%G\xCE\xBA\x1b%\x1b%@"), |
797 | 0x03BA, 0x1B, '%', 0, -1); |
c6cef4fa |
798 | /* DOCS (COMPOUND_TEXT extended segment) */ |
799 | iso2022_read_test(TESTSTR("\x1b%/1\x80\x80"), 0, -1); |
800 | iso2022_read_test(TESTSTR("\x1b%/1\x80\x8fiso-8859-15\2xyz\x1b(B"), |
801 | ERROR, ERROR, ERROR, 0, -1); |
802 | iso2022_read_test(TESTSTR("\x1b%/1\x80\x8eiso8859-15\2xyz\x1b(B"), |
803 | 'x', 'y', 'z', 0, -1); |
804 | iso2022_read_test(TESTSTR("\x1b-A\x1b%/2\x80\x89" |
805 | "big5-0\2\xa1\x40\xa1\x40"), |
806 | 0x3000, 0xa1, 0x40, 0, -1); |
28b8e668 |
807 | /* Emacs Big5-in-ISO-2022 mapping */ |
808 | iso2022_read_test(TESTSTR("\x1b$(0&x86\x1b(B \x1b$(0DeBv"), |
809 | 0x5143, 0x6c23, ' ', ' ', 0x958b, 0x767c, 0, -1); |
113375ca |
810 | /* Test from RFC 1922 (ISO-2022-CN) */ |
811 | iso2022_read_test(TESTSTR("\x1b$)A\x0e=;;;\x1b$)GG(_P\x0f"), |
812 | 0x4EA4, 0x6362, 0x4EA4, 0x63db, 0, -1); |
813 | |
b97e5427 |
814 | printf("read tests completed\n"); |
815 | printf("total: %d errors\n", total_errs); |
816 | return (total_errs != 0); |
817 | } |
818 | |
819 | #endif /* TESTMODE */ |
820 | |
821 | #else /* ENUM_CHARSETS */ |
822 | |
823 | ENUM_CHARSET(CS_ISO2022) |
824 | |
825 | #endif |