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comparison: intl/icu/source/tools/toolutil/ucmstate.c

intl/icu/source/tools/toolutil/ucmstate.c

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1 /*
2 *******************************************************************************
3 *
4 * Copyright (C) 2003-2012, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 *******************************************************************************
8 * file name: ucmstate.c
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2003oct09
14 * created by: Markus W. Scherer
15 *
16 * This file handles ICU .ucm file state information as part of the ucm module.
17 * Most of this code used to be in makeconv.c.
18 */
19
20 #include "unicode/utypes.h"
21 #include "cstring.h"
22 #include "cmemory.h"
23 #include "uarrsort.h"
24 #include "ucnvmbcs.h"
25 #include "ucnv_ext.h"
26 #include "uparse.h"
27 #include "ucm.h"
28 #include <stdio.h>
29
30 #if !UCONFIG_NO_CONVERSION
31
32 /* MBCS state handling ------------------------------------------------------ */
33
34 /*
35 * state table row grammar (ebnf-style):
36 * (whitespace is allowed between all tokens)
37 *
38 * row=[[firstentry ','] entry (',' entry)*]
39 * firstentry="initial" | "surrogates"
40 * (initial state (default for state 0), output is all surrogate pairs)
41 * entry=range [':' nextstate] ['.' action]
42 * range=number ['-' number]
43 * nextstate=number
44 * (0..7f)
45 * action='u' | 's' | 'p' | 'i'
46 * (unassigned, state change only, surrogate pair, illegal)
47 * number=(1- or 2-digit hexadecimal number)
48 */
49 static const char *
50 parseState(const char *s, int32_t state[256], uint32_t *pFlags) {
51 const char *t;
52 uint32_t start, end, i;
53 int32_t entry;
54
55 /* initialize the state: all illegal with U+ffff */
56 for(i=0; i<256; ++i) {
57 state[i]=MBCS_ENTRY_FINAL(0, MBCS_STATE_ILLEGAL, 0xffff);
58 }
59
60 /* skip leading white space */
61 s=u_skipWhitespace(s);
62
63 /* is there an "initial" or "surrogates" directive? */
64 if(uprv_strncmp("initial", s, 7)==0) {
65 *pFlags=MBCS_STATE_FLAG_DIRECT;
66 s=u_skipWhitespace(s+7);
67 if(*s++!=',') {
68 return s-1;
69 }
70 } else if(*pFlags==0 && uprv_strncmp("surrogates", s, 10)==0) {
71 *pFlags=MBCS_STATE_FLAG_SURROGATES;
72 s=u_skipWhitespace(s+10);
73 if(*s++!=',') {
74 return s-1;
75 }
76 } else if(*s==0) {
77 /* empty state row: all-illegal */
78 return NULL;
79 }
80
81 for(;;) {
82 /* read an entry, the start of the range first */
83 s=u_skipWhitespace(s);
84 start=uprv_strtoul(s, (char **)&t, 16);
85 if(s==t || 0xff<start) {
86 return s;
87 }
88 s=u_skipWhitespace(t);
89
90 /* read the end of the range if there is one */
91 if(*s=='-') {
92 s=u_skipWhitespace(s+1);
93 end=uprv_strtoul(s, (char **)&t, 16);
94 if(s==t || end<start || 0xff<end) {
95 return s;
96 }
97 s=u_skipWhitespace(t);
98 } else {
99 end=start;
100 }
101
102 /* determine the state entrys for this range */
103 if(*s!=':' && *s!='.') {
104 /* the default is: final state with valid entries */
105 entry=MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_16, 0);
106 } else {
107 entry=MBCS_ENTRY_TRANSITION(0, 0);
108 if(*s==':') {
109 /* get the next state, default to 0 */
110 s=u_skipWhitespace(s+1);
111 i=uprv_strtoul(s, (char **)&t, 16);
112 if(s!=t) {
113 if(0x7f<i) {
114 return s;
115 }
116 s=u_skipWhitespace(t);
117 entry=MBCS_ENTRY_SET_STATE(entry, i);
118 }
119 }
120
121 /* get the state action, default to valid */
122 if(*s=='.') {
123 /* this is a final state */
124 entry=MBCS_ENTRY_SET_FINAL(entry);
125
126 s=u_skipWhitespace(s+1);
127 if(*s=='u') {
128 /* unassigned set U+fffe */
129 entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_UNASSIGNED, 0xfffe);
130 s=u_skipWhitespace(s+1);
131 } else if(*s=='p') {
132 if(*pFlags!=MBCS_STATE_FLAG_DIRECT) {
133 entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16_PAIR);
134 } else {
135 entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16);
136 }
137 s=u_skipWhitespace(s+1);
138 } else if(*s=='s') {
139 entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_CHANGE_ONLY);
140 s=u_skipWhitespace(s+1);
141 } else if(*s=='i') {
142 /* illegal set U+ffff */
143 entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_ILLEGAL, 0xffff);
144 s=u_skipWhitespace(s+1);
145 } else {
146 /* default to valid */
147 entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16);
148 }
149 } else {
150 /* this is an intermediate state, nothing to do */
151 }
152 }
153
154 /* adjust "final valid" states according to the state flags */
155 if(MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_16) {
156 switch(*pFlags) {
157 case 0:
158 /* no adjustment */
159 break;
160 case MBCS_STATE_FLAG_DIRECT:
161 /* set the valid-direct code point to "unassigned"==0xfffe */
162 entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_VALID_DIRECT_16, 0xfffe);
163 break;
164 case MBCS_STATE_FLAG_SURROGATES:
165 entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_VALID_16_PAIR, 0);
166 break;
167 default:
168 break;
169 }
170 }
171
172 /* set this entry for the range */
173 for(i=start; i<=end; ++i) {
174 state[i]=entry;
175 }
176
177 if(*s==',') {
178 ++s;
179 } else {
180 return *s==0 ? NULL : s;
181 }
182 }
183 }
184
185 U_CAPI void U_EXPORT2
186 ucm_addState(UCMStates *states, const char *s) {
187 const char *error;
188
189 if(states->countStates==MBCS_MAX_STATE_COUNT) {
190 fprintf(stderr, "ucm error: too many states (maximum %u)\n", MBCS_MAX_STATE_COUNT);
191 exit(U_INVALID_TABLE_FORMAT);
192 }
193
194 error=parseState(s, states->stateTable[states->countStates],
195 &states->stateFlags[states->countStates]);
196 if(error!=NULL) {
197 fprintf(stderr, "ucm error: parse error in state definition at '%s'\n", error);
198 exit(U_INVALID_TABLE_FORMAT);
199 }
200
201 ++states->countStates;
202 }
203
204 U_CAPI UBool U_EXPORT2
205 ucm_parseHeaderLine(UCMFile *ucm,
206 char *line, char **pKey, char **pValue) {
207 UCMStates *states;
208 char *s, *end;
209 char c;
210
211 states=&ucm->states;
212
213 /* remove comments and trailing CR and LF and remove whitespace from the end */
214 for(end=line; (c=*end)!=0; ++end) {
215 if(c=='#' || c=='\r' || c=='\n') {
216 break;
217 }
218 }
219 while(end>line && (*(end-1)==' ' || *(end-1)=='\t')) {
220 --end;
221 }
222 *end=0;
223
224 /* skip leading white space and ignore empty lines */
225 s=(char *)u_skipWhitespace(line);
226 if(*s==0) {
227 return TRUE;
228 }
229
230 /* stop at the beginning of the mapping section */
231 if(uprv_memcmp(s, "CHARMAP", 7)==0) {
232 return FALSE;
233 }
234
235 /* get the key name, bracketed in <> */
236 if(*s!='<') {
237 fprintf(stderr, "ucm error: no header field <key> in line \"%s\"\n", line);
238 exit(U_INVALID_TABLE_FORMAT);
239 }
240 *pKey=++s;
241 while(*s!='>') {
242 if(*s==0) {
243 fprintf(stderr, "ucm error: incomplete header field <key> in line \"%s\"\n", line);
244 exit(U_INVALID_TABLE_FORMAT);
245 }
246 ++s;
247 }
248 *s=0;
249
250 /* get the value string, possibly quoted */
251 s=(char *)u_skipWhitespace(s+1);
252 if(*s!='"') {
253 *pValue=s;
254 } else {
255 /* remove the quotes */
256 *pValue=s+1;
257 if(end>*pValue && *(end-1)=='"') {
258 *--end=0;
259 }
260 }
261
262 /* collect the information from the header field, ignore unknown keys */
263 if(uprv_strcmp(*pKey, "uconv_class")==0) {
264 if(uprv_strcmp(*pValue, "DBCS")==0) {
265 states->conversionType=UCNV_DBCS;
266 } else if(uprv_strcmp(*pValue, "SBCS")==0) {
267 states->conversionType = UCNV_SBCS;
268 } else if(uprv_strcmp(*pValue, "MBCS")==0) {
269 states->conversionType = UCNV_MBCS;
270 } else if(uprv_strcmp(*pValue, "EBCDIC_STATEFUL")==0) {
271 states->conversionType = UCNV_EBCDIC_STATEFUL;
272 } else {
273 fprintf(stderr, "ucm error: unknown <uconv_class> %s\n", *pValue);
274 exit(U_INVALID_TABLE_FORMAT);
275 }
276 return TRUE;
277 } else if(uprv_strcmp(*pKey, "mb_cur_max")==0) {
278 c=**pValue;
279 if('1'<=c && c<='4' && (*pValue)[1]==0) {
280 states->maxCharLength=(int8_t)(c-'0');
281 states->outputType=(int8_t)(states->maxCharLength-1);
282 } else {
283 fprintf(stderr, "ucm error: illegal <mb_cur_max> %s\n", *pValue);
284 exit(U_INVALID_TABLE_FORMAT);
285 }
286 return TRUE;
287 } else if(uprv_strcmp(*pKey, "mb_cur_min")==0) {
288 c=**pValue;
289 if('1'<=c && c<='4' && (*pValue)[1]==0) {
290 states->minCharLength=(int8_t)(c-'0');
291 } else {
292 fprintf(stderr, "ucm error: illegal <mb_cur_min> %s\n", *pValue);
293 exit(U_INVALID_TABLE_FORMAT);
294 }
295 return TRUE;
296 } else if(uprv_strcmp(*pKey, "icu:state")==0) {
297 /* if an SBCS/DBCS/EBCDIC_STATEFUL converter has icu:state, then turn it into MBCS */
298 switch(states->conversionType) {
299 case UCNV_SBCS:
300 case UCNV_DBCS:
301 case UCNV_EBCDIC_STATEFUL:
302 states->conversionType=UCNV_MBCS;
303 break;
304 case UCNV_MBCS:
305 break;
306 default:
307 fprintf(stderr, "ucm error: <icu:state> entry for non-MBCS table or before the <uconv_class> line\n");
308 exit(U_INVALID_TABLE_FORMAT);
309 }
310
311 if(states->maxCharLength==0) {
312 fprintf(stderr, "ucm error: <icu:state> before the <mb_cur_max> line\n");
313 exit(U_INVALID_TABLE_FORMAT);
314 }
315 ucm_addState(states, *pValue);
316 return TRUE;
317 } else if(uprv_strcmp(*pKey, "icu:base")==0) {
318 if(**pValue==0) {
319 fprintf(stderr, "ucm error: <icu:base> without a base table name\n");
320 exit(U_INVALID_TABLE_FORMAT);
321 }
322 uprv_strcpy(ucm->baseName, *pValue);
323 return TRUE;
324 }
325
326 return FALSE;
327 }
328
329 /* post-processing ---------------------------------------------------------- */
330
331 static int32_t
332 sumUpStates(UCMStates *states) {
333 int32_t entry, sum, state, cell, count;
334 UBool allStatesReady;
335
336 /*
337 * Sum up the offsets for all states.
338 * In each final state (where there are only final entries),
339 * the offsets add up directly.
340 * In all other state table rows, for each transition entry to another state,
341 * the offsets sum of that state needs to be added.
342 * This is achieved in at most countStates iterations.
343 */
344 allStatesReady=FALSE;
345 for(count=states->countStates; !allStatesReady && count>=0; --count) {
346 allStatesReady=TRUE;
347 for(state=states->countStates-1; state>=0; --state) {
348 if(!(states->stateFlags[state]&MBCS_STATE_FLAG_READY)) {
349 allStatesReady=FALSE;
350 sum=0;
351
352 /* at first, add up only the final delta offsets to keep them <512 */
353 for(cell=0; cell<256; ++cell) {
354 entry=states->stateTable[state][cell];
355 if(MBCS_ENTRY_IS_FINAL(entry)) {
356 switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
357 case MBCS_STATE_VALID_16:
358 states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_VALUE(entry, sum);
359 sum+=1;
360 break;
361 case MBCS_STATE_VALID_16_PAIR:
362 states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_VALUE(entry, sum);
363 sum+=2;
364 break;
365 default:
366 /* no addition */
367 break;
368 }
369 }
370 }
371
372 /* now, add up the delta offsets for the transitional entries */
373 for(cell=0; cell<256; ++cell) {
374 entry=states->stateTable[state][cell];
375 if(MBCS_ENTRY_IS_TRANSITION(entry)) {
376 if(states->stateFlags[MBCS_ENTRY_TRANSITION_STATE(entry)]&MBCS_STATE_FLAG_READY) {
377 states->stateTable[state][cell]=MBCS_ENTRY_TRANSITION_SET_OFFSET(entry, sum);
378 sum+=states->stateOffsetSum[MBCS_ENTRY_TRANSITION_STATE(entry)];
379 } else {
380 /* that next state does not have a sum yet, we cannot finish the one for this state */
381 sum=-1;
382 break;
383 }
384 }
385 }
386
387 if(sum!=-1) {
388 states->stateOffsetSum[state]=sum;
389 states->stateFlags[state]|=MBCS_STATE_FLAG_READY;
390 }
391 }
392 }
393 }
394
395 if(!allStatesReady) {
396 fprintf(stderr, "ucm error: the state table contains loops\n");
397 exit(U_INVALID_TABLE_FORMAT);
398 }
399
400 /*
401 * For all "direct" (i.e., initial) states>0,
402 * the offsets need to be increased by the sum of
403 * the previous initial states.
404 */
405 sum=states->stateOffsetSum[0];
406 for(state=1; state<states->countStates; ++state) {
407 if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) {
408 int32_t sum2=sum;
409 sum+=states->stateOffsetSum[state];
410 for(cell=0; cell<256; ++cell) {
411 entry=states->stateTable[state][cell];
412 if(MBCS_ENTRY_IS_TRANSITION(entry)) {
413 states->stateTable[state][cell]=MBCS_ENTRY_TRANSITION_ADD_OFFSET(entry, sum2);
414 }
415 }
416 }
417 }
418
419 /* round up to the next even number to have the following data 32-bit-aligned */
420 return states->countToUCodeUnits=(sum+1)&~1;
421 }
422
423 U_CAPI void U_EXPORT2
424 ucm_processStates(UCMStates *states, UBool ignoreSISOCheck) {
425 int32_t entry, state, cell, count;
426
427 if(states->conversionType==UCNV_UNSUPPORTED_CONVERTER) {
428 fprintf(stderr, "ucm error: missing conversion type (<uconv_class>)\n");
429 exit(U_INVALID_TABLE_FORMAT);
430 }
431
432 if(states->countStates==0) {
433 switch(states->conversionType) {
434 case UCNV_SBCS:
435 /* SBCS: use MBCS data structure with a default state table */
436 if(states->maxCharLength!=1) {
437 fprintf(stderr, "error: SBCS codepage with max B/char!=1\n");
438 exit(U_INVALID_TABLE_FORMAT);
439 }
440 states->conversionType=UCNV_MBCS;
441 ucm_addState(states, "0-ff");
442 break;
443 case UCNV_MBCS:
444 fprintf(stderr, "ucm error: missing state table information (<icu:state>) for MBCS\n");
445 exit(U_INVALID_TABLE_FORMAT);
446 break;
447 case UCNV_EBCDIC_STATEFUL:
448 /* EBCDIC_STATEFUL: use MBCS data structure with a default state table */
449 if(states->minCharLength!=1 || states->maxCharLength!=2) {
450 fprintf(stderr, "error: DBCS codepage with min B/char!=1 or max B/char!=2\n");
451 exit(U_INVALID_TABLE_FORMAT);
452 }
453 states->conversionType=UCNV_MBCS;
454 ucm_addState(states, "0-ff, e:1.s, f:0.s");
455 ucm_addState(states, "initial, 0-3f:4, e:1.s, f:0.s, 40:3, 41-fe:2, ff:4");
456 ucm_addState(states, "0-40:1.i, 41-fe:1., ff:1.i");
457 ucm_addState(states, "0-ff:1.i, 40:1.");
458 ucm_addState(states, "0-ff:1.i");
459 break;
460 case UCNV_DBCS:
461 /* DBCS: use MBCS data structure with a default state table */
462 if(states->minCharLength!=2 || states->maxCharLength!=2) {
463 fprintf(stderr, "error: DBCS codepage with min or max B/char!=2\n");
464 exit(U_INVALID_TABLE_FORMAT);
465 }
466 states->conversionType = UCNV_MBCS;
467 ucm_addState(states, "0-3f:3, 40:2, 41-fe:1, ff:3");
468 ucm_addState(states, "41-fe");
469 ucm_addState(states, "40");
470 ucm_addState(states, "");
471 break;
472 default:
473 fprintf(stderr, "ucm error: unknown charset structure\n");
474 exit(U_INVALID_TABLE_FORMAT);
475 break;
476 }
477 }
478
479 /*
480 * check that the min/max character lengths are reasonable;
481 * to do this right, all paths through the state table would have to be
482 * recursively walked while keeping track of the sequence lengths,
483 * but these simple checks cover most state tables in practice
484 */
485 if(states->maxCharLength<states->minCharLength) {
486 fprintf(stderr, "ucm error: max B/char < min B/char\n");
487 exit(U_INVALID_TABLE_FORMAT);
488 }
489
490 /* count non-direct states and compare with max B/char */
491 count=0;
492 for(state=0; state<states->countStates; ++state) {
493 if((states->stateFlags[state]&0xf)!=MBCS_STATE_FLAG_DIRECT) {
494 ++count;
495 }
496 }
497 if(states->maxCharLength>count+1) {
498 fprintf(stderr, "ucm error: max B/char too large\n");
499 exit(U_INVALID_TABLE_FORMAT);
500 }
501
502 if(states->minCharLength==1) {
503 int32_t action;
504
505 /*
506 * if there are single-byte characters,
507 * then the initial state must have direct result states
508 */
509 for(cell=0; cell<256; ++cell) {
510 entry=states->stateTable[0][cell];
511 if( MBCS_ENTRY_IS_FINAL(entry) &&
512 ((action=MBCS_ENTRY_FINAL_ACTION(entry))==MBCS_STATE_VALID_DIRECT_16 ||
513 action==MBCS_STATE_UNASSIGNED)
514 ) {
515 break;
516 }
517 }
518
519 if(cell==256) {
520 fprintf(stderr, "ucm warning: min B/char too small\n");
521 }
522 }
523
524 /*
525 * make sure that all "next state" values are within limits
526 * and that all next states after final ones have the "direct"
527 * flag of initial states
528 */
529 for(state=states->countStates-1; state>=0; --state) {
530 for(cell=0; cell<256; ++cell) {
531 entry=states->stateTable[state][cell];
532 if((uint8_t)MBCS_ENTRY_STATE(entry)>=states->countStates) {
533 fprintf(stderr, "ucm error: state table entry [%x][%x] has a next state of %x that is too high\n",
534 (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry));
535 exit(U_INVALID_TABLE_FORMAT);
536 }
537 if(MBCS_ENTRY_IS_FINAL(entry) && (states->stateFlags[MBCS_ENTRY_STATE(entry)]&0xf)!=MBCS_STATE_FLAG_DIRECT) {
538 fprintf(stderr, "ucm error: state table entry [%x][%x] is final but has a non-initial next state of %x\n",
539 (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry));
540 exit(U_INVALID_TABLE_FORMAT);
541 } else if(MBCS_ENTRY_IS_TRANSITION(entry) && (states->stateFlags[MBCS_ENTRY_STATE(entry)]&0xf)==MBCS_STATE_FLAG_DIRECT) {
542 fprintf(stderr, "ucm error: state table entry [%x][%x] is not final but has an initial next state of %x\n",
543 (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry));
544 exit(U_INVALID_TABLE_FORMAT);
545 }
546 }
547 }
548
549 /* is this an SI/SO (like EBCDIC-stateful) state table? */
550 if(states->countStates>=2 && (states->stateFlags[1]&0xf)==MBCS_STATE_FLAG_DIRECT) {
551 if(states->maxCharLength!=2) {
552 fprintf(stderr, "ucm error: SI/SO codepages must have max 2 bytes/char (not %x)\n", (int)states->maxCharLength);
553 exit(U_INVALID_TABLE_FORMAT);
554 }
555 if(states->countStates<3) {
556 fprintf(stderr, "ucm error: SI/SO codepages must have at least 3 states (not %x)\n", (int)states->countStates);
557 exit(U_INVALID_TABLE_FORMAT);
558 }
559 /* are the SI/SO all in the right places? */
560 if( ignoreSISOCheck ||
561 (states->stateTable[0][0xe]==MBCS_ENTRY_FINAL(1, MBCS_STATE_CHANGE_ONLY, 0) &&
562 states->stateTable[0][0xf]==MBCS_ENTRY_FINAL(0, MBCS_STATE_CHANGE_ONLY, 0) &&
563 states->stateTable[1][0xe]==MBCS_ENTRY_FINAL(1, MBCS_STATE_CHANGE_ONLY, 0) &&
564 states->stateTable[1][0xf]==MBCS_ENTRY_FINAL(0, MBCS_STATE_CHANGE_ONLY, 0))
565 ) {
566 states->outputType=MBCS_OUTPUT_2_SISO;
567 } else {
568 fprintf(stderr, "ucm error: SI/SO codepages must have in states 0 and 1 transitions e:1.s, f:0.s\n");
569 exit(U_INVALID_TABLE_FORMAT);
570 }
571 state=2;
572 } else {
573 state=1;
574 }
575
576 /* check that no unexpected state is a "direct" one */
577 while(state<states->countStates) {
578 if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) {
579 fprintf(stderr, "ucm error: state %d is 'initial' - not supported except for SI/SO codepages\n", (int)state);
580 exit(U_INVALID_TABLE_FORMAT);
581 }
582 ++state;
583 }
584
585 sumUpStates(states);
586 }
587
588 /* find a fallback for this offset; return the index or -1 if not found */
589 U_CAPI int32_t U_EXPORT2
590 ucm_findFallback(_MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
591 uint32_t offset) {
592 int32_t i;
593
594 if(countToUFallbacks==0) {
595 /* shortcut: most codepages do not have fallbacks from codepage to Unicode */
596 return -1;
597 }
598
599 /* do a linear search for the fallback mapping (the table is not yet sorted) */
600 for(i=0; i<countToUFallbacks; ++i) {
601 if(offset==toUFallbacks[i].offset) {
602 return i;
603 }
604 }
605 return -1;
606 }
607
608 /*
609 * This function tries to compact toUnicode tables for 2-byte codepages
610 * by finding lead bytes with all-unassigned trail bytes and adding another state
611 * for them.
612 */
613 static void
614 compactToUnicode2(UCMStates *states,
615 uint16_t **pUnicodeCodeUnits,
616 _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
617 UBool verbose) {
618 int32_t (*oldStateTable)[256];
619 uint16_t count[256];
620 uint16_t *oldUnicodeCodeUnits;
621 int32_t entry, offset, oldOffset, trailOffset, oldTrailOffset, savings, sum;
622 int32_t i, j, leadState, trailState, newState, fallback;
623 uint16_t unit;
624
625 /* find the lead state */
626 if(states->outputType==MBCS_OUTPUT_2_SISO) {
627 /* use the DBCS lead state for SI/SO codepages */
628 leadState=1;
629 } else {
630 leadState=0;
631 }
632
633 /* find the main trail state: the most used target state */
634 uprv_memset(count, 0, sizeof(count));
635 for(i=0; i<256; ++i) {
636 entry=states->stateTable[leadState][i];
637 if(MBCS_ENTRY_IS_TRANSITION(entry)) {
638 ++count[MBCS_ENTRY_TRANSITION_STATE(entry)];
639 }
640 }
641 trailState=0;
642 for(i=1; i<states->countStates; ++i) {
643 if(count[i]>count[trailState]) {
644 trailState=i;
645 }
646 }
647
648 /* count possible savings from lead bytes with all-unassigned results in all trail bytes */
649 uprv_memset(count, 0, sizeof(count));
650 savings=0;
651 /* for each lead byte */
652 for(i=0; i<256; ++i) {
653 entry=states->stateTable[leadState][i];
654 if(MBCS_ENTRY_IS_TRANSITION(entry) && (MBCS_ENTRY_TRANSITION_STATE(entry))==trailState) {
655 /* the offset is different for each lead byte */
656 offset=MBCS_ENTRY_TRANSITION_OFFSET(entry);
657 /* for each trail byte for this lead byte */
658 for(j=0; j<256; ++j) {
659 entry=states->stateTable[trailState][j];
660 switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
661 case MBCS_STATE_VALID_16:
662 entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry);
663 if((*pUnicodeCodeUnits)[entry]==0xfffe && ucm_findFallback(toUFallbacks, countToUFallbacks, entry)<0) {
664 ++count[i];
665 } else {
666 j=999; /* do not count for this lead byte because there are assignments */
667 }
668 break;
669 case MBCS_STATE_VALID_16_PAIR:
670 entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry);
671 if((*pUnicodeCodeUnits)[entry]==0xfffe) {
672 count[i]+=2;
673 } else {
674 j=999; /* do not count for this lead byte because there are assignments */
675 }
676 break;
677 default:
678 break;
679 }
680 }
681 if(j==256) {
682 /* all trail bytes for this lead byte are unassigned */
683 savings+=count[i];
684 } else {
685 count[i]=0;
686 }
687 }
688 }
689 /* subtract from the possible savings the cost of an additional state */
690 savings=savings*2-1024; /* count bytes, not 16-bit words */
691 if(savings<=0) {
692 return;
693 }
694 if(verbose) {
695 printf("compacting toUnicode data saves %ld bytes\n", (long)savings);
696 }
697 if(states->countStates>=MBCS_MAX_STATE_COUNT) {
698 fprintf(stderr, "cannot compact toUnicode because the maximum number of states is reached\n");
699 return;
700 }
701
702 /* make a copy of the state table */
703 oldStateTable=(int32_t (*)[256])uprv_malloc(states->countStates*1024);
704 if(oldStateTable==NULL) {
705 fprintf(stderr, "cannot compact toUnicode: out of memory\n");
706 return;
707 }
708 uprv_memcpy(oldStateTable, states->stateTable, states->countStates*1024);
709
710 /* add the new state */
711 /*
712 * this function does not catch the degenerate case where all lead bytes
713 * have all-unassigned trail bytes and the lead state could be removed
714 */
715 newState=states->countStates++;
716 states->stateFlags[newState]=0;
717 /* copy the old trail state, turning all assigned states into unassigned ones */
718 for(i=0; i<256; ++i) {
719 entry=states->stateTable[trailState][i];
720 switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
721 case MBCS_STATE_VALID_16:
722 case MBCS_STATE_VALID_16_PAIR:
723 states->stateTable[newState][i]=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_UNASSIGNED, 0xfffe);
724 break;
725 default:
726 states->stateTable[newState][i]=entry;
727 break;
728 }
729 }
730
731 /* in the lead state, redirect all lead bytes with all-unassigned trail bytes to the new state */
732 for(i=0; i<256; ++i) {
733 if(count[i]>0) {
734 states->stateTable[leadState][i]=MBCS_ENTRY_SET_STATE(states->stateTable[leadState][i], newState);
735 }
736 }
737
738 /* sum up the new state table */
739 for(i=0; i<states->countStates; ++i) {
740 states->stateFlags[i]&=~MBCS_STATE_FLAG_READY;
741 }
742 sum=sumUpStates(states);
743
744 /* allocate a new, smaller code units array */
745 oldUnicodeCodeUnits=*pUnicodeCodeUnits;
746 if(sum==0) {
747 *pUnicodeCodeUnits=NULL;
748 if(oldUnicodeCodeUnits!=NULL) {
749 uprv_free(oldUnicodeCodeUnits);
750 }
751 uprv_free(oldStateTable);
752 return;
753 }
754 *pUnicodeCodeUnits=(uint16_t *)uprv_malloc(sum*sizeof(uint16_t));
755 if(*pUnicodeCodeUnits==NULL) {
756 fprintf(stderr, "cannot compact toUnicode: out of memory allocating %ld 16-bit code units\n",
757 (long)sum);
758 /* revert to the old state table */
759 *pUnicodeCodeUnits=oldUnicodeCodeUnits;
760 --states->countStates;
761 uprv_memcpy(states->stateTable, oldStateTable, states->countStates*1024);
762 uprv_free(oldStateTable);
763 return;
764 }
765 for(i=0; i<sum; ++i) {
766 (*pUnicodeCodeUnits)[i]=0xfffe;
767 }
768
769 /* copy the code units for all assigned characters */
770 /*
771 * The old state table has the same lead _and_ trail states for assigned characters!
772 * The differences are in the offsets, and in the trail states for some unassigned characters.
773 * For each character with an assigned state in the new table, it was assigned in the old one.
774 * Only still-assigned characters are copied.
775 * Note that fallback mappings need to get their offset values adjusted.
776 */
777
778 /* for each initial state */
779 for(leadState=0; leadState<states->countStates; ++leadState) {
780 if((states->stateFlags[leadState]&0xf)==MBCS_STATE_FLAG_DIRECT) {
781 /* for each lead byte from there */
782 for(i=0; i<256; ++i) {
783 entry=states->stateTable[leadState][i];
784 if(MBCS_ENTRY_IS_TRANSITION(entry)) {
785 trailState=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
786 /* the new state does not have assigned states */
787 if(trailState!=newState) {
788 trailOffset=MBCS_ENTRY_TRANSITION_OFFSET(entry);
789 oldTrailOffset=MBCS_ENTRY_TRANSITION_OFFSET(oldStateTable[leadState][i]);
790 /* for each trail byte */
791 for(j=0; j<256; ++j) {
792 entry=states->stateTable[trailState][j];
793 /* copy assigned-character code units and adjust fallback offsets */
794 switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
795 case MBCS_STATE_VALID_16:
796 offset=trailOffset+MBCS_ENTRY_FINAL_VALUE_16(entry);
797 /* find the old offset according to the old state table */
798 oldOffset=oldTrailOffset+MBCS_ENTRY_FINAL_VALUE_16(oldStateTable[trailState][j]);
799 unit=(*pUnicodeCodeUnits)[offset]=oldUnicodeCodeUnits[oldOffset];
800 if(unit==0xfffe && (fallback=ucm_findFallback(toUFallbacks, countToUFallbacks, oldOffset))>=0) {
801 toUFallbacks[fallback].offset=0x80000000|offset;
802 }
803 break;
804 case MBCS_STATE_VALID_16_PAIR:
805 offset=trailOffset+MBCS_ENTRY_FINAL_VALUE_16(entry);
806 /* find the old offset according to the old state table */
807 oldOffset=oldTrailOffset+MBCS_ENTRY_FINAL_VALUE_16(oldStateTable[trailState][j]);
808 (*pUnicodeCodeUnits)[offset++]=oldUnicodeCodeUnits[oldOffset++];
809 (*pUnicodeCodeUnits)[offset]=oldUnicodeCodeUnits[oldOffset];
810 break;
811 default:
812 break;
813 }
814 }
815 }
816 }
817 }
818 }
819 }
820
821 /* remove temporary flags from fallback offsets that protected them from being modified twice */
822 for(i=0; i<countToUFallbacks; ++i) {
823 toUFallbacks[i].offset&=0x7fffffff;
824 }
825
826 /* free temporary memory */
827 uprv_free(oldUnicodeCodeUnits);
828 uprv_free(oldStateTable);
829 }
830
831 /*
832 * recursive sub-function of compactToUnicodeHelper()
833 * returns:
834 * >0 number of bytes that are used in unicodeCodeUnits[] that could be saved,
835 * if all sequences from this state are unassigned, returns the
836 * <0 there are assignments in unicodeCodeUnits[]
837 * 0 no use of unicodeCodeUnits[]
838 */
839 static int32_t
840 findUnassigned(UCMStates *states,
841 uint16_t *unicodeCodeUnits,
842 _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
843 int32_t state, int32_t offset, uint32_t b) {
844 int32_t i, entry, savings, localSavings, belowSavings;
845 UBool haveAssigned;
846
847 localSavings=belowSavings=0;
848 haveAssigned=FALSE;
849 for(i=0; i<256; ++i) {
850 entry=states->stateTable[state][i];
851 if(MBCS_ENTRY_IS_TRANSITION(entry)) {
852 savings=findUnassigned(states,
853 unicodeCodeUnits,
854 toUFallbacks, countToUFallbacks,
855 MBCS_ENTRY_TRANSITION_STATE(entry),
856 offset+MBCS_ENTRY_TRANSITION_OFFSET(entry),
857 (b<<8)|(uint32_t)i);
858 if(savings<0) {
859 haveAssigned=TRUE;
860 } else if(savings>0) {
861 printf(" all-unassigned sequences from prefix 0x%02lx state %ld use %ld bytes\n",
862 (unsigned long)((b<<8)|i), (long)state, (long)savings);
863 belowSavings+=savings;
864 }
865 } else if(!haveAssigned) {
866 switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
867 case MBCS_STATE_VALID_16:
868 entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry);
869 if(unicodeCodeUnits[entry]==0xfffe && ucm_findFallback(toUFallbacks, countToUFallbacks, entry)<0) {
870 localSavings+=2;
871 } else {
872 haveAssigned=TRUE;
873 }
874 break;
875 case MBCS_STATE_VALID_16_PAIR:
876 entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry);
877 if(unicodeCodeUnits[entry]==0xfffe) {
878 localSavings+=4;
879 } else {
880 haveAssigned=TRUE;
881 }
882 break;
883 default:
884 break;
885 }
886 }
887 }
888 if(haveAssigned) {
889 return -1;
890 } else {
891 return localSavings+belowSavings;
892 }
893 }
894
895 /* helper function for finding compaction opportunities */
896 static void
897 compactToUnicodeHelper(UCMStates *states,
898 uint16_t *unicodeCodeUnits,
899 _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks) {
900 int32_t state, savings;
901
902 /* for each initial state */
903 for(state=0; state<states->countStates; ++state) {
904 if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) {
905 savings=findUnassigned(states,
906 unicodeCodeUnits,
907 toUFallbacks, countToUFallbacks,
908 state, 0, 0);
909 if(savings>0) {
910 printf(" all-unassigned sequences from initial state %ld use %ld bytes\n",
911 (long)state, (long)savings);
912 }
913 }
914 }
915 }
916
917 static int32_t
918 compareFallbacks(const void *context, const void *fb1, const void *fb2) {
919 return ((const _MBCSToUFallback *)fb1)->offset-((const _MBCSToUFallback *)fb2)->offset;
920 }
921
922 U_CAPI void U_EXPORT2
923 ucm_optimizeStates(UCMStates *states,
924 uint16_t **pUnicodeCodeUnits,
925 _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
926 UBool verbose) {
927 UErrorCode errorCode;
928 int32_t state, cell, entry;
929
930 /* test each state table entry */
931 for(state=0; state<states->countStates; ++state) {
932 for(cell=0; cell<256; ++cell) {
933 entry=states->stateTable[state][cell];
934 /*
935 * if the entry is a final one with an MBCS_STATE_VALID_DIRECT_16 action code
936 * and the code point is "unassigned" (0xfffe), then change it to
937 * the "unassigned" action code with bits 26..23 set to zero and U+fffe.
938 */
939 if(MBCS_ENTRY_SET_STATE(entry, 0)==MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, 0xfffe)) {
940 states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_UNASSIGNED);
941 }
942 }
943 }
944
945 /* try to compact the toUnicode tables */
946 if(states->maxCharLength==2) {
947 compactToUnicode2(states, pUnicodeCodeUnits, toUFallbacks, countToUFallbacks, verbose);
948 } else if(states->maxCharLength>2) {
949 if(verbose) {
950 compactToUnicodeHelper(states, *pUnicodeCodeUnits, toUFallbacks, countToUFallbacks);
951 }
952 }
953
954 /* sort toUFallbacks */
955 /*
956 * It should be safe to sort them before compactToUnicode2() is called,
957 * because it should not change the relative order of the offset values
958 * that it adjusts, but they need to be sorted at some point, and
959 * it is safest here.
960 */
961 if(countToUFallbacks>0) {
962 errorCode=U_ZERO_ERROR; /* nothing bad will happen... */
963 uprv_sortArray(toUFallbacks, countToUFallbacks,
964 sizeof(_MBCSToUFallback),
965 compareFallbacks, NULL, FALSE, &errorCode);
966 }
967 }
968
969 /* use a complete state table ----------------------------------------------- */
970
971 U_CAPI int32_t U_EXPORT2
972 ucm_countChars(UCMStates *states,
973 const uint8_t *bytes, int32_t length) {
974 uint32_t offset;
975 int32_t i, entry, count;
976 uint8_t state;
977
978 offset=0;
979 count=0;
980 state=0;
981
982 if(states->countStates==0) {
983 fprintf(stderr, "ucm error: there is no state information!\n");
984 return -1;
985 }
986
987 /* for SI/SO (like EBCDIC-stateful), double-byte sequences start in state 1 */
988 if(length==2 && states->outputType==MBCS_OUTPUT_2_SISO) {
989 state=1;
990 }
991
992 /*
993 * Walk down the state table like in conversion,
994 * much like getNextUChar().
995 * We assume that c<=0x10ffff.
996 */
997 for(i=0; i<length; ++i) {
998 entry=states->stateTable[state][bytes[i]];
999 if(MBCS_ENTRY_IS_TRANSITION(entry)) {
1000 state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
1001 offset+=MBCS_ENTRY_TRANSITION_OFFSET(entry);
1002 } else {
1003 switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
1004 case MBCS_STATE_ILLEGAL:
1005 fprintf(stderr, "ucm error: byte sequence ends in illegal state\n");
1006 return -1;
1007 case MBCS_STATE_CHANGE_ONLY:
1008 fprintf(stderr, "ucm error: byte sequence ends in state-change-only\n");
1009 return -1;
1010 case MBCS_STATE_UNASSIGNED:
1011 case MBCS_STATE_FALLBACK_DIRECT_16:
1012 case MBCS_STATE_VALID_DIRECT_16:
1013 case MBCS_STATE_FALLBACK_DIRECT_20:
1014 case MBCS_STATE_VALID_DIRECT_20:
1015 case MBCS_STATE_VALID_16:
1016 case MBCS_STATE_VALID_16_PAIR:
1017 /* count a complete character and prepare for a new one */
1018 ++count;
1019 state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry);
1020 offset=0;
1021 break;
1022 default:
1023 /* reserved, must never occur */
1024 fprintf(stderr, "ucm error: byte sequence reached reserved action code, entry: 0x%02lx\n", (unsigned long)entry);
1025 return -1;
1026 }
1027 }
1028 }
1029
1030 if(offset!=0) {
1031 fprintf(stderr, "ucm error: byte sequence too short, ends in non-final state %u\n", state);
1032 return -1;
1033 }
1034
1035 /*
1036 * for SI/SO (like EBCDIC-stateful), multiple-character results
1037 * must consist of only double-byte sequences
1038 */
1039 if(count>1 && states->outputType==MBCS_OUTPUT_2_SISO && length!=2*count) {
1040 fprintf(stderr, "ucm error: SI/SO (like EBCDIC-stateful) result with %d characters does not contain all DBCS\n", (int)count);
1041 return -1;
1042 }
1043
1044 return count;
1045 }
1046 #endif
1047

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