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[apple/icu.git] / icuSources / common / uts46.cpp
1 /*
2 *******************************************************************************
3 * Copyright (C) 2010-2012, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 *******************************************************************************
6 * file name: uts46.cpp
7 * encoding: US-ASCII
8 * tab size: 8 (not used)
9 * indentation:4
10 *
11 * created on: 2010mar09
12 * created by: Markus W. Scherer
13 */
14
15 #include "unicode/utypes.h"
16
17 #if !UCONFIG_NO_IDNA
18
19 #include "unicode/idna.h"
20 #include "unicode/normalizer2.h"
21 #include "unicode/uscript.h"
22 #include "unicode/ustring.h"
23 #include "unicode/utf16.h"
24 #include "cmemory.h"
25 #include "cstring.h"
26 #include "punycode.h"
27 #include "ubidi_props.h"
28 #include "ustr_imp.h"
29
30 #define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))
31
32 // Note about tests for UIDNA_ERROR_DOMAIN_NAME_TOO_LONG:
33 //
34 // The domain name length limit is 255 octets in an internal DNS representation
35 // where the last ("root") label is the empty label
36 // represented by length byte 0 alone.
37 // In a conventional string, this translates to 253 characters, or 254
38 // if there is a trailing dot for the root label.
39
40 U_NAMESPACE_BEGIN
41
42 // Severe errors which usually result in a U+FFFD replacement character in the result string.
43 const uint32_t severeErrors=
44 UIDNA_ERROR_LEADING_COMBINING_MARK|
45 UIDNA_ERROR_DISALLOWED|
46 UIDNA_ERROR_PUNYCODE|
47 UIDNA_ERROR_LABEL_HAS_DOT|
48 UIDNA_ERROR_INVALID_ACE_LABEL;
49
50 static inline UBool
51 isASCIIString(const UnicodeString &dest) {
52 const UChar *s=dest.getBuffer();
53 const UChar *limit=s+dest.length();
54 while(s<limit) {
55 if(*s++>0x7f) {
56 return FALSE;
57 }
58 }
59 return TRUE;
60 }
61
62 static UBool
63 isASCIIOkBiDi(const UChar *s, int32_t length);
64
65 static UBool
66 isASCIIOkBiDi(const char *s, int32_t length);
67
68 // IDNA class default implementations -------------------------------------- ***
69
70 IDNA::~IDNA() {}
71
72 void
73 IDNA::labelToASCII_UTF8(const StringPiece &label, ByteSink &dest,
74 IDNAInfo &info, UErrorCode &errorCode) const {
75 if(U_SUCCESS(errorCode)) {
76 UnicodeString destString;
77 labelToASCII(UnicodeString::fromUTF8(label), destString,
78 info, errorCode).toUTF8(dest);
79 }
80 }
81
82 void
83 IDNA::labelToUnicodeUTF8(const StringPiece &label, ByteSink &dest,
84 IDNAInfo &info, UErrorCode &errorCode) const {
85 if(U_SUCCESS(errorCode)) {
86 UnicodeString destString;
87 labelToUnicode(UnicodeString::fromUTF8(label), destString,
88 info, errorCode).toUTF8(dest);
89 }
90 }
91
92 void
93 IDNA::nameToASCII_UTF8(const StringPiece &name, ByteSink &dest,
94 IDNAInfo &info, UErrorCode &errorCode) const {
95 if(U_SUCCESS(errorCode)) {
96 UnicodeString destString;
97 nameToASCII(UnicodeString::fromUTF8(name), destString,
98 info, errorCode).toUTF8(dest);
99 }
100 }
101
102 void
103 IDNA::nameToUnicodeUTF8(const StringPiece &name, ByteSink &dest,
104 IDNAInfo &info, UErrorCode &errorCode) const {
105 if(U_SUCCESS(errorCode)) {
106 UnicodeString destString;
107 nameToUnicode(UnicodeString::fromUTF8(name), destString,
108 info, errorCode).toUTF8(dest);
109 }
110 }
111
112 // UTS46 class declaration ------------------------------------------------- ***
113
114 class UTS46 : public IDNA {
115 public:
116 UTS46(uint32_t options, UErrorCode &errorCode);
117 virtual ~UTS46();
118
119 virtual UnicodeString &
120 labelToASCII(const UnicodeString &label, UnicodeString &dest,
121 IDNAInfo &info, UErrorCode &errorCode) const;
122
123 virtual UnicodeString &
124 labelToUnicode(const UnicodeString &label, UnicodeString &dest,
125 IDNAInfo &info, UErrorCode &errorCode) const;
126
127 virtual UnicodeString &
128 nameToASCII(const UnicodeString &name, UnicodeString &dest,
129 IDNAInfo &info, UErrorCode &errorCode) const;
130
131 virtual UnicodeString &
132 nameToUnicode(const UnicodeString &name, UnicodeString &dest,
133 IDNAInfo &info, UErrorCode &errorCode) const;
134
135 virtual void
136 labelToASCII_UTF8(const StringPiece &label, ByteSink &dest,
137 IDNAInfo &info, UErrorCode &errorCode) const;
138
139 virtual void
140 labelToUnicodeUTF8(const StringPiece &label, ByteSink &dest,
141 IDNAInfo &info, UErrorCode &errorCode) const;
142
143 virtual void
144 nameToASCII_UTF8(const StringPiece &name, ByteSink &dest,
145 IDNAInfo &info, UErrorCode &errorCode) const;
146
147 virtual void
148 nameToUnicodeUTF8(const StringPiece &name, ByteSink &dest,
149 IDNAInfo &info, UErrorCode &errorCode) const;
150
151 private:
152 UnicodeString &
153 process(const UnicodeString &src,
154 UBool isLabel, UBool toASCII,
155 UnicodeString &dest,
156 IDNAInfo &info, UErrorCode &errorCode) const;
157
158 void
159 processUTF8(const StringPiece &src,
160 UBool isLabel, UBool toASCII,
161 ByteSink &dest,
162 IDNAInfo &info, UErrorCode &errorCode) const;
163
164 UnicodeString &
165 processUnicode(const UnicodeString &src,
166 int32_t labelStart, int32_t mappingStart,
167 UBool isLabel, UBool toASCII,
168 UnicodeString &dest,
169 IDNAInfo &info, UErrorCode &errorCode) const;
170
171 // returns the new dest.length()
172 int32_t
173 mapDevChars(UnicodeString &dest, int32_t labelStart, int32_t mappingStart,
174 UErrorCode &errorCode) const;
175
176 // returns the new label length
177 int32_t
178 processLabel(UnicodeString &dest,
179 int32_t labelStart, int32_t labelLength,
180 UBool toASCII,
181 IDNAInfo &info, UErrorCode &errorCode) const;
182 int32_t
183 markBadACELabel(UnicodeString &dest,
184 int32_t labelStart, int32_t labelLength,
185 UBool toASCII, IDNAInfo &info) const;
186
187 void
188 checkLabelBiDi(const UChar *label, int32_t labelLength, IDNAInfo &info) const;
189
190 UBool
191 isLabelOkContextJ(const UChar *label, int32_t labelLength) const;
192
193 void
194 checkLabelContextO(const UChar *label, int32_t labelLength, IDNAInfo &info) const;
195
196 const Normalizer2 &uts46Norm2; // uts46.nrm
197 uint32_t options;
198 };
199
200 IDNA *
201 IDNA::createUTS46Instance(uint32_t options, UErrorCode &errorCode) {
202 if(U_SUCCESS(errorCode)) {
203 IDNA *idna=new UTS46(options, errorCode);
204 if(idna==NULL) {
205 errorCode=U_MEMORY_ALLOCATION_ERROR;
206 } else if(U_FAILURE(errorCode)) {
207 delete idna;
208 idna=NULL;
209 }
210 return idna;
211 } else {
212 return NULL;
213 }
214 }
215
216 // UTS46 implementation ---------------------------------------------------- ***
217
218 UTS46::UTS46(uint32_t opt, UErrorCode &errorCode)
219 : uts46Norm2(*Normalizer2::getInstance(NULL, "uts46", UNORM2_COMPOSE, errorCode)),
220 options(opt) {}
221
222 UTS46::~UTS46() {}
223
224 UnicodeString &
225 UTS46::labelToASCII(const UnicodeString &label, UnicodeString &dest,
226 IDNAInfo &info, UErrorCode &errorCode) const {
227 return process(label, TRUE, TRUE, dest, info, errorCode);
228 }
229
230 UnicodeString &
231 UTS46::labelToUnicode(const UnicodeString &label, UnicodeString &dest,
232 IDNAInfo &info, UErrorCode &errorCode) const {
233 return process(label, TRUE, FALSE, dest, info, errorCode);
234 }
235
236 UnicodeString &
237 UTS46::nameToASCII(const UnicodeString &name, UnicodeString &dest,
238 IDNAInfo &info, UErrorCode &errorCode) const {
239 process(name, FALSE, TRUE, dest, info, errorCode);
240 if( dest.length()>=254 && (info.errors&UIDNA_ERROR_DOMAIN_NAME_TOO_LONG)==0 &&
241 isASCIIString(dest) &&
242 (dest.length()>254 || dest[253]!=0x2e)
243 ) {
244 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
245 }
246 return dest;
247 }
248
249 UnicodeString &
250 UTS46::nameToUnicode(const UnicodeString &name, UnicodeString &dest,
251 IDNAInfo &info, UErrorCode &errorCode) const {
252 return process(name, FALSE, FALSE, dest, info, errorCode);
253 }
254
255 void
256 UTS46::labelToASCII_UTF8(const StringPiece &label, ByteSink &dest,
257 IDNAInfo &info, UErrorCode &errorCode) const {
258 processUTF8(label, TRUE, TRUE, dest, info, errorCode);
259 }
260
261 void
262 UTS46::labelToUnicodeUTF8(const StringPiece &label, ByteSink &dest,
263 IDNAInfo &info, UErrorCode &errorCode) const {
264 processUTF8(label, TRUE, FALSE, dest, info, errorCode);
265 }
266
267 void
268 UTS46::nameToASCII_UTF8(const StringPiece &name, ByteSink &dest,
269 IDNAInfo &info, UErrorCode &errorCode) const {
270 processUTF8(name, FALSE, TRUE, dest, info, errorCode);
271 }
272
273 void
274 UTS46::nameToUnicodeUTF8(const StringPiece &name, ByteSink &dest,
275 IDNAInfo &info, UErrorCode &errorCode) const {
276 processUTF8(name, FALSE, FALSE, dest, info, errorCode);
277 }
278
279 // UTS #46 data for ASCII characters.
280 // The normalizer (using uts46.nrm) maps uppercase ASCII letters to lowercase
281 // and passes through all other ASCII characters.
282 // If UIDNA_USE_STD3_RULES is set, then non-LDH characters are disallowed
283 // using this data.
284 // The ASCII fastpath also uses this data.
285 // Values: -1=disallowed 0==valid 1==mapped (lowercase)
286 static const int8_t asciiData[128]={
287 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
288 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
289 // 002D..002E; valid # HYPHEN-MINUS..FULL STOP
290 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, -1,
291 // 0030..0039; valid # DIGIT ZERO..DIGIT NINE
292 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1,
293 // 0041..005A; mapped # LATIN CAPITAL LETTER A..LATIN CAPITAL LETTER Z
294 -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
295 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
296 // 0061..007A; valid # LATIN SMALL LETTER A..LATIN SMALL LETTER Z
297 -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
298 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1
299 };
300
301 UnicodeString &
302 UTS46::process(const UnicodeString &src,
303 UBool isLabel, UBool toASCII,
304 UnicodeString &dest,
305 IDNAInfo &info, UErrorCode &errorCode) const {
306 // uts46Norm2.normalize() would do all of this error checking and setup,
307 // but with the ASCII fastpath we do not always call it, and do not
308 // call it first.
309 if(U_FAILURE(errorCode)) {
310 dest.setToBogus();
311 return dest;
312 }
313 const UChar *srcArray=src.getBuffer();
314 if(&dest==&src || srcArray==NULL) {
315 errorCode=U_ILLEGAL_ARGUMENT_ERROR;
316 dest.setToBogus();
317 return dest;
318 }
319 // Arguments are fine, reset output values.
320 dest.remove();
321 info.reset();
322 int32_t srcLength=src.length();
323 if(srcLength==0) {
324 if(toASCII) {
325 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
326 }
327 return dest;
328 }
329 UChar *destArray=dest.getBuffer(srcLength);
330 if(destArray==NULL) {
331 errorCode=U_MEMORY_ALLOCATION_ERROR;
332 return dest;
333 }
334 // ASCII fastpath
335 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
336 int32_t labelStart=0;
337 int32_t i;
338 for(i=0;; ++i) {
339 if(i==srcLength) {
340 if(toASCII) {
341 if((i-labelStart)>63) {
342 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
343 }
344 // There is a trailing dot if labelStart==i.
345 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
346 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
347 }
348 }
349 info.errors|=info.labelErrors;
350 dest.releaseBuffer(i);
351 return dest;
352 }
353 UChar c=srcArray[i];
354 if(c>0x7f) {
355 break;
356 }
357 int cData=asciiData[c];
358 if(cData>0) {
359 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
360 } else if(cData<0 && disallowNonLDHDot) {
361 break; // Replacing with U+FFFD can be complicated for toASCII.
362 } else {
363 destArray[i]=c;
364 if(c==0x2d) { // hyphen
365 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
366 // "??--..." is Punycode or forbidden.
367 ++i; // '-' was copied to dest already
368 break;
369 }
370 if(i==labelStart) {
371 // label starts with "-"
372 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
373 }
374 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
375 // label ends with "-"
376 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
377 }
378 } else if(c==0x2e) { // dot
379 if(isLabel) {
380 // Replacing with U+FFFD can be complicated for toASCII.
381 ++i; // '.' was copied to dest already
382 break;
383 }
384 if(toASCII) {
385 // Permit an empty label at the end but not elsewhere.
386 if(i==labelStart && i<(srcLength-1)) {
387 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
388 } else if((i-labelStart)>63) {
389 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
390 }
391 }
392 info.errors|=info.labelErrors;
393 info.labelErrors=0;
394 labelStart=i+1;
395 }
396 }
397 }
398 info.errors|=info.labelErrors;
399 dest.releaseBuffer(i);
400 processUnicode(src, labelStart, i, isLabel, toASCII, dest, info, errorCode);
401 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
402 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(dest.getBuffer(), labelStart)))
403 ) {
404 info.errors|=UIDNA_ERROR_BIDI;
405 }
406 return dest;
407 }
408
409 void
410 UTS46::processUTF8(const StringPiece &src,
411 UBool isLabel, UBool toASCII,
412 ByteSink &dest,
413 IDNAInfo &info, UErrorCode &errorCode) const {
414 if(U_FAILURE(errorCode)) {
415 return;
416 }
417 const char *srcArray=src.data();
418 int32_t srcLength=src.length();
419 if(srcArray==NULL && srcLength!=0) {
420 errorCode=U_ILLEGAL_ARGUMENT_ERROR;
421 return;
422 }
423 // Arguments are fine, reset output values.
424 info.reset();
425 if(srcLength==0) {
426 if(toASCII) {
427 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
428 }
429 dest.Flush();
430 return;
431 }
432 UnicodeString destString;
433 int32_t labelStart=0;
434 if(srcLength<=256) { // length of stackArray[]
435 // ASCII fastpath
436 char stackArray[256];
437 int32_t destCapacity;
438 char *destArray=dest.GetAppendBuffer(srcLength, srcLength+20,
439 stackArray, LENGTHOF(stackArray), &destCapacity);
440 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
441 int32_t i;
442 for(i=0;; ++i) {
443 if(i==srcLength) {
444 if(toASCII) {
445 if((i-labelStart)>63) {
446 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
447 }
448 // There is a trailing dot if labelStart==i.
449 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
450 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
451 }
452 }
453 info.errors|=info.labelErrors;
454 dest.Append(destArray, i);
455 dest.Flush();
456 return;
457 }
458 char c=srcArray[i];
459 if((int8_t)c<0) { // (uint8_t)c>0x7f
460 break;
461 }
462 int cData=asciiData[(int)c]; // Cast: gcc warns about indexing with a char.
463 if(cData>0) {
464 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
465 } else if(cData<0 && disallowNonLDHDot) {
466 break; // Replacing with U+FFFD can be complicated for toASCII.
467 } else {
468 destArray[i]=c;
469 if(c==0x2d) { // hyphen
470 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
471 // "??--..." is Punycode or forbidden.
472 break;
473 }
474 if(i==labelStart) {
475 // label starts with "-"
476 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
477 }
478 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
479 // label ends with "-"
480 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
481 }
482 } else if(c==0x2e) { // dot
483 if(isLabel) {
484 break; // Replacing with U+FFFD can be complicated for toASCII.
485 }
486 if(toASCII) {
487 // Permit an empty label at the end but not elsewhere.
488 if(i==labelStart && i<(srcLength-1)) {
489 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
490 } else if((i-labelStart)>63) {
491 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
492 }
493 }
494 info.errors|=info.labelErrors;
495 info.labelErrors=0;
496 labelStart=i+1;
497 }
498 }
499 }
500 info.errors|=info.labelErrors;
501 // Convert the processed ASCII prefix of the current label to UTF-16.
502 int32_t mappingStart=i-labelStart;
503 destString=UnicodeString::fromUTF8(StringPiece(destArray+labelStart, mappingStart));
504 // Output the previous ASCII labels and process the rest of src in UTF-16.
505 dest.Append(destArray, labelStart);
506 processUnicode(UnicodeString::fromUTF8(StringPiece(src, labelStart)), 0, mappingStart,
507 isLabel, toASCII,
508 destString, info, errorCode);
509 } else {
510 // src is too long for the ASCII fastpath implementation.
511 processUnicode(UnicodeString::fromUTF8(src), 0, 0,
512 isLabel, toASCII,
513 destString, info, errorCode);
514 }
515 destString.toUTF8(dest); // calls dest.Flush()
516 if(toASCII && !isLabel) {
517 // length==labelStart==254 means that there is a trailing dot (ok) and
518 // destString is empty (do not index at 253-labelStart).
519 int32_t length=labelStart+destString.length();
520 if( length>=254 && isASCIIString(destString) &&
521 (length>254 ||
522 (labelStart<254 && destString[253-labelStart]!=0x2e))
523 ) {
524 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
525 }
526 }
527 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
528 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(srcArray, labelStart)))
529 ) {
530 info.errors|=UIDNA_ERROR_BIDI;
531 }
532 }
533
534 UnicodeString &
535 UTS46::processUnicode(const UnicodeString &src,
536 int32_t labelStart, int32_t mappingStart,
537 UBool isLabel, UBool toASCII,
538 UnicodeString &dest,
539 IDNAInfo &info, UErrorCode &errorCode) const {
540 if(mappingStart==0) {
541 uts46Norm2.normalize(src, dest, errorCode);
542 } else {
543 uts46Norm2.normalizeSecondAndAppend(dest, src.tempSubString(mappingStart), errorCode);
544 }
545 if(U_FAILURE(errorCode)) {
546 return dest;
547 }
548 UBool doMapDevChars=
549 toASCII ? (options&UIDNA_NONTRANSITIONAL_TO_ASCII)==0 :
550 (options&UIDNA_NONTRANSITIONAL_TO_UNICODE)==0;
551 const UChar *destArray=dest.getBuffer();
552 int32_t destLength=dest.length();
553 int32_t labelLimit=labelStart;
554 while(labelLimit<destLength) {
555 UChar c=destArray[labelLimit];
556 if(c==0x2e && !isLabel) {
557 int32_t labelLength=labelLimit-labelStart;
558 int32_t newLength=processLabel(dest, labelStart, labelLength,
559 toASCII, info, errorCode);
560 info.errors|=info.labelErrors;
561 info.labelErrors=0;
562 if(U_FAILURE(errorCode)) {
563 return dest;
564 }
565 destArray=dest.getBuffer();
566 destLength+=newLength-labelLength;
567 labelLimit=labelStart+=newLength+1;
568 } else if(0xdf<=c && c<=0x200d && (c==0xdf || c==0x3c2 || c>=0x200c)) {
569 info.isTransDiff=TRUE;
570 if(doMapDevChars) {
571 destLength=mapDevChars(dest, labelStart, labelLimit, errorCode);
572 if(U_FAILURE(errorCode)) {
573 return dest;
574 }
575 destArray=dest.getBuffer();
576 // Do not increment labelLimit in case c was removed.
577 // All deviation characters have been mapped, no need to check for them again.
578 doMapDevChars=FALSE;
579 } else {
580 ++labelLimit;
581 }
582 } else {
583 ++labelLimit;
584 }
585 }
586 // Permit an empty label at the end (0<labelStart==labelLimit==destLength is ok)
587 // but not an empty label elsewhere nor a completely empty domain name.
588 // processLabel() sets UIDNA_ERROR_EMPTY_LABEL when labelLength==0.
589 if(0==labelStart || labelStart<labelLimit) {
590 processLabel(dest, labelStart, labelLimit-labelStart,
591 toASCII, info, errorCode);
592 info.errors|=info.labelErrors;
593 }
594 return dest;
595 }
596
597 int32_t
598 UTS46::mapDevChars(UnicodeString &dest, int32_t labelStart, int32_t mappingStart,
599 UErrorCode &errorCode) const {
600 int32_t length=dest.length();
601 UChar *s=dest.getBuffer(dest[mappingStart]==0xdf ? length+1 : length);
602 if(s==NULL) {
603 errorCode=U_MEMORY_ALLOCATION_ERROR;
604 return length;
605 }
606 int32_t capacity=dest.getCapacity();
607 UBool didMapDevChars=FALSE;
608 int32_t readIndex=mappingStart, writeIndex=mappingStart;
609 do {
610 UChar c=s[readIndex++];
611 switch(c) {
612 case 0xdf:
613 // Map sharp s to ss.
614 didMapDevChars=TRUE;
615 s[writeIndex++]=0x73; // Replace sharp s with first s.
616 // Insert second s and account for possible buffer reallocation.
617 if(writeIndex==readIndex) {
618 if(length==capacity) {
619 dest.releaseBuffer(length);
620 s=dest.getBuffer(length+1);
621 if(s==NULL) {
622 errorCode=U_MEMORY_ALLOCATION_ERROR;
623 return length;
624 }
625 capacity=dest.getCapacity();
626 }
627 u_memmove(s+writeIndex+1, s+writeIndex, length-writeIndex);
628 ++readIndex;
629 }
630 s[writeIndex++]=0x73;
631 ++length;
632 break;
633 case 0x3c2: // Map final sigma to nonfinal sigma.
634 didMapDevChars=TRUE;
635 s[writeIndex++]=0x3c3;
636 break;
637 case 0x200c: // Ignore/remove ZWNJ.
638 case 0x200d: // Ignore/remove ZWJ.
639 didMapDevChars=TRUE;
640 --length;
641 break;
642 default:
643 // Only really necessary if writeIndex was different from readIndex.
644 s[writeIndex++]=c;
645 break;
646 }
647 } while(writeIndex<length);
648 dest.releaseBuffer(length);
649 if(didMapDevChars) {
650 // Mapping deviation characters might have resulted in an un-NFC string.
651 // We could use either the NFC or the UTS #46 normalizer.
652 // By using the UTS #46 normalizer again, we avoid having to load a second .nrm data file.
653 UnicodeString normalized;
654 uts46Norm2.normalize(dest.tempSubString(labelStart), normalized, errorCode);
655 if(U_SUCCESS(errorCode)) {
656 dest.replace(labelStart, 0x7fffffff, normalized);
657 return dest.length();
658 }
659 }
660 return length;
661 }
662
663 // Some non-ASCII characters are equivalent to sequences with
664 // non-LDH ASCII characters. To find them:
665 // grep disallowed_STD3_valid IdnaMappingTable.txt (or uts46.txt)
666 static inline UBool
667 isNonASCIIDisallowedSTD3Valid(UChar32 c) {
668 return c==0x2260 || c==0x226E || c==0x226F;
669 }
670
671 // Replace the label in dest with the label string, if the label was modified.
672 // If &label==&dest then the label was modified in-place and labelLength
673 // is the new label length, different from label.length().
674 // If &label!=&dest then labelLength==label.length().
675 // Returns labelLength (= the new label length).
676 static int32_t
677 replaceLabel(UnicodeString &dest, int32_t destLabelStart, int32_t destLabelLength,
678 const UnicodeString &label, int32_t labelLength) {
679 if(&label!=&dest) {
680 dest.replace(destLabelStart, destLabelLength, label);
681 }
682 return labelLength;
683 }
684
685 int32_t
686 UTS46::processLabel(UnicodeString &dest,
687 int32_t labelStart, int32_t labelLength,
688 UBool toASCII,
689 IDNAInfo &info, UErrorCode &errorCode) const {
690 UnicodeString fromPunycode;
691 UnicodeString *labelString;
692 const UChar *label=dest.getBuffer()+labelStart;
693 int32_t destLabelStart=labelStart;
694 int32_t destLabelLength=labelLength;
695 UBool wasPunycode;
696 if(labelLength>=4 && label[0]==0x78 && label[1]==0x6e && label[2]==0x2d && label[3]==0x2d) {
697 // Label starts with "xn--", try to un-Punycode it.
698 wasPunycode=TRUE;
699 UChar *unicodeBuffer=fromPunycode.getBuffer(-1); // capacity==-1: most labels should fit
700 if(unicodeBuffer==NULL) {
701 // Should never occur if we used capacity==-1 which uses the internal buffer.
702 errorCode=U_MEMORY_ALLOCATION_ERROR;
703 return labelLength;
704 }
705 UErrorCode punycodeErrorCode=U_ZERO_ERROR;
706 int32_t unicodeLength=u_strFromPunycode(label+4, labelLength-4,
707 unicodeBuffer, fromPunycode.getCapacity(),
708 NULL, &punycodeErrorCode);
709 if(punycodeErrorCode==U_BUFFER_OVERFLOW_ERROR) {
710 fromPunycode.releaseBuffer(0);
711 unicodeBuffer=fromPunycode.getBuffer(unicodeLength);
712 if(unicodeBuffer==NULL) {
713 errorCode=U_MEMORY_ALLOCATION_ERROR;
714 return labelLength;
715 }
716 punycodeErrorCode=U_ZERO_ERROR;
717 unicodeLength=u_strFromPunycode(label+4, labelLength-4,
718 unicodeBuffer, fromPunycode.getCapacity(),
719 NULL, &punycodeErrorCode);
720 }
721 fromPunycode.releaseBuffer(unicodeLength);
722 if(U_FAILURE(punycodeErrorCode)) {
723 info.labelErrors|=UIDNA_ERROR_PUNYCODE;
724 return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
725 }
726 // Check for NFC, and for characters that are not
727 // valid or deviation characters according to the normalizer.
728 // If there is something wrong, then the string will change.
729 // Note that the normalizer passes through non-LDH ASCII and deviation characters.
730 // Deviation characters are ok in Punycode even in transitional processing.
731 // In the code further below, if we find non-LDH ASCII and we have UIDNA_USE_STD3_RULES
732 // then we will set UIDNA_ERROR_INVALID_ACE_LABEL there too.
733 UBool isValid=uts46Norm2.isNormalized(fromPunycode, errorCode);
734 if(U_FAILURE(errorCode)) {
735 return labelLength;
736 }
737 if(!isValid) {
738 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
739 return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
740 }
741 labelString=&fromPunycode;
742 label=fromPunycode.getBuffer();
743 labelStart=0;
744 labelLength=fromPunycode.length();
745 } else {
746 wasPunycode=FALSE;
747 labelString=&dest;
748 }
749 // Validity check
750 if(labelLength==0) {
751 if(toASCII) {
752 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
753 }
754 return replaceLabel(dest, destLabelStart, destLabelLength, *labelString, labelLength);
755 }
756 // labelLength>0
757 if(labelLength>=4 && label[2]==0x2d && label[3]==0x2d) {
758 // label starts with "??--"
759 info.labelErrors|=UIDNA_ERROR_HYPHEN_3_4;
760 }
761 if(label[0]==0x2d) {
762 // label starts with "-"
763 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
764 }
765 if(label[labelLength-1]==0x2d) {
766 // label ends with "-"
767 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
768 }
769 // If the label was not a Punycode label, then it was the result of
770 // mapping, normalization and label segmentation.
771 // If the label was in Punycode, then we mapped it again above
772 // and checked its validity.
773 // Now we handle the STD3 restriction to LDH characters (if set)
774 // and we look for U+FFFD which indicates disallowed characters
775 // in a non-Punycode label or U+FFFD itself in a Punycode label.
776 // We also check for dots which can come from the input to a single-label function.
777 // Ok to cast away const because we own the UnicodeString.
778 UChar *s=(UChar *)label;
779 const UChar *limit=label+labelLength;
780 UChar oredChars=0;
781 // If we enforce STD3 rules, then ASCII characters other than LDH and dot are disallowed.
782 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
783 do {
784 UChar c=*s;
785 if(c<=0x7f) {
786 if(c==0x2e) {
787 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
788 *s=0xfffd;
789 } else if(disallowNonLDHDot && asciiData[c]<0) {
790 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
791 *s=0xfffd;
792 }
793 } else {
794 oredChars|=c;
795 if(disallowNonLDHDot && isNonASCIIDisallowedSTD3Valid(c)) {
796 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
797 *s=0xfffd;
798 } else if(c==0xfffd) {
799 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
800 }
801 }
802 ++s;
803 } while(s<limit);
804 // Check for a leading combining mark after other validity checks
805 // so that we don't report UIDNA_ERROR_DISALLOWED for the U+FFFD from here.
806 UChar32 c;
807 int32_t cpLength=0;
808 // "Unsafe" is ok because unpaired surrogates were mapped to U+FFFD.
809 U16_NEXT_UNSAFE(label, cpLength, c);
810 if((U_GET_GC_MASK(c)&U_GC_M_MASK)!=0) {
811 info.labelErrors|=UIDNA_ERROR_LEADING_COMBINING_MARK;
812 labelString->replace(labelStart, cpLength, (UChar)0xfffd);
813 label=labelString->getBuffer()+labelStart;
814 labelLength+=1-cpLength;
815 if(labelString==&dest) {
816 destLabelLength=labelLength;
817 }
818 }
819 if((info.labelErrors&severeErrors)==0) {
820 // Do contextual checks only if we do not have U+FFFD from a severe error
821 // because U+FFFD can make these checks fail.
822 if((options&UIDNA_CHECK_BIDI)!=0 && (!info.isBiDi || info.isOkBiDi)) {
823 checkLabelBiDi(label, labelLength, info);
824 }
825 if( (options&UIDNA_CHECK_CONTEXTJ)!=0 && (oredChars&0x200c)==0x200c &&
826 !isLabelOkContextJ(label, labelLength)
827 ) {
828 info.labelErrors|=UIDNA_ERROR_CONTEXTJ;
829 }
830 if((options&UIDNA_CHECK_CONTEXTO)!=0 && oredChars>=0xb7) {
831 checkLabelContextO(label, labelLength, info);
832 }
833 if(toASCII) {
834 if(wasPunycode) {
835 // Leave a Punycode label unchanged if it has no severe errors.
836 if(destLabelLength>63) {
837 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
838 }
839 return destLabelLength;
840 } else if(oredChars>=0x80) {
841 // Contains non-ASCII characters.
842 UnicodeString punycode;
843 UChar *buffer=punycode.getBuffer(63); // 63==maximum DNS label length
844 if(buffer==NULL) {
845 errorCode=U_MEMORY_ALLOCATION_ERROR;
846 return destLabelLength;
847 }
848 buffer[0]=0x78; // Write "xn--".
849 buffer[1]=0x6e;
850 buffer[2]=0x2d;
851 buffer[3]=0x2d;
852 int32_t punycodeLength=u_strToPunycode(label, labelLength,
853 buffer+4, punycode.getCapacity()-4,
854 NULL, &errorCode);
855 if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
856 errorCode=U_ZERO_ERROR;
857 punycode.releaseBuffer(4);
858 buffer=punycode.getBuffer(4+punycodeLength);
859 if(buffer==NULL) {
860 errorCode=U_MEMORY_ALLOCATION_ERROR;
861 return destLabelLength;
862 }
863 punycodeLength=u_strToPunycode(label, labelLength,
864 buffer+4, punycode.getCapacity()-4,
865 NULL, &errorCode);
866 }
867 punycodeLength+=4;
868 punycode.releaseBuffer(punycodeLength);
869 if(U_FAILURE(errorCode)) {
870 return destLabelLength;
871 }
872 if(punycodeLength>63) {
873 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
874 }
875 return replaceLabel(dest, destLabelStart, destLabelLength,
876 punycode, punycodeLength);
877 } else {
878 // all-ASCII label
879 if(labelLength>63) {
880 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
881 }
882 }
883 }
884 } else {
885 // If a Punycode label has severe errors,
886 // then leave it but make sure it does not look valid.
887 if(wasPunycode) {
888 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
889 return markBadACELabel(dest, destLabelStart, destLabelLength, toASCII, info);
890 }
891 }
892 return replaceLabel(dest, destLabelStart, destLabelLength, *labelString, labelLength);
893 }
894
895 // Make sure an ACE label does not look valid.
896 // Append U+FFFD if the label has only LDH characters.
897 // If UIDNA_USE_STD3_RULES, also replace disallowed ASCII characters with U+FFFD.
898 int32_t
899 UTS46::markBadACELabel(UnicodeString &dest,
900 int32_t labelStart, int32_t labelLength,
901 UBool toASCII, IDNAInfo &info) const {
902 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
903 UBool isASCII=TRUE;
904 UBool onlyLDH=TRUE;
905 const UChar *label=dest.getBuffer()+labelStart;
906 // Ok to cast away const because we own the UnicodeString.
907 UChar *s=(UChar *)label+4; // After the initial "xn--".
908 const UChar *limit=label+labelLength;
909 do {
910 UChar c=*s;
911 if(c<=0x7f) {
912 if(c==0x2e) {
913 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
914 *s=0xfffd;
915 isASCII=onlyLDH=FALSE;
916 } else if(asciiData[c]<0) {
917 onlyLDH=FALSE;
918 if(disallowNonLDHDot) {
919 *s=0xfffd;
920 isASCII=FALSE;
921 }
922 }
923 } else {
924 isASCII=onlyLDH=FALSE;
925 }
926 } while(++s<limit);
927 if(onlyLDH) {
928 dest.insert(labelStart+labelLength, (UChar)0xfffd);
929 ++labelLength;
930 } else {
931 if(toASCII && isASCII && labelLength>63) {
932 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
933 }
934 }
935 return labelLength;
936 }
937
938 const uint32_t L_MASK=U_MASK(U_LEFT_TO_RIGHT);
939 const uint32_t R_AL_MASK=U_MASK(U_RIGHT_TO_LEFT)|U_MASK(U_RIGHT_TO_LEFT_ARABIC);
940 const uint32_t L_R_AL_MASK=L_MASK|R_AL_MASK;
941
942 const uint32_t R_AL_AN_MASK=R_AL_MASK|U_MASK(U_ARABIC_NUMBER);
943
944 const uint32_t EN_AN_MASK=U_MASK(U_EUROPEAN_NUMBER)|U_MASK(U_ARABIC_NUMBER);
945 const uint32_t R_AL_EN_AN_MASK=R_AL_MASK|EN_AN_MASK;
946 const uint32_t L_EN_MASK=L_MASK|U_MASK(U_EUROPEAN_NUMBER);
947
948 const uint32_t ES_CS_ET_ON_BN_NSM_MASK=
949 U_MASK(U_EUROPEAN_NUMBER_SEPARATOR)|
950 U_MASK(U_COMMON_NUMBER_SEPARATOR)|
951 U_MASK(U_EUROPEAN_NUMBER_TERMINATOR)|
952 U_MASK(U_OTHER_NEUTRAL)|
953 U_MASK(U_BOUNDARY_NEUTRAL)|
954 U_MASK(U_DIR_NON_SPACING_MARK);
955 const uint32_t L_EN_ES_CS_ET_ON_BN_NSM_MASK=L_EN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
956 const uint32_t R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK=R_AL_MASK|EN_AN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
957
958 // We scan the whole label and check both for whether it contains RTL characters
959 // and whether it passes the BiDi Rule.
960 // In a BiDi domain name, all labels must pass the BiDi Rule, but we might find
961 // that a domain name is a BiDi domain name (has an RTL label) only after
962 // processing several earlier labels.
963 void
964 UTS46::checkLabelBiDi(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
965 // IDNA2008 BiDi rule
966 // Get the directionality of the first character.
967 UChar32 c;
968 int32_t i=0;
969 U16_NEXT_UNSAFE(label, i, c);
970 uint32_t firstMask=U_MASK(u_charDirection(c));
971 // 1. The first character must be a character with BIDI property L, R
972 // or AL. If it has the R or AL property, it is an RTL label; if it
973 // has the L property, it is an LTR label.
974 if((firstMask&~L_R_AL_MASK)!=0) {
975 info.isOkBiDi=FALSE;
976 }
977 // Get the directionality of the last non-NSM character.
978 uint32_t lastMask;
979 for(;;) {
980 if(i>=labelLength) {
981 lastMask=firstMask;
982 break;
983 }
984 U16_PREV_UNSAFE(label, labelLength, c);
985 UCharDirection dir=u_charDirection(c);
986 if(dir!=U_DIR_NON_SPACING_MARK) {
987 lastMask=U_MASK(dir);
988 break;
989 }
990 }
991 // 3. In an RTL label, the end of the label must be a character with
992 // BIDI property R, AL, EN or AN, followed by zero or more
993 // characters with BIDI property NSM.
994 // 6. In an LTR label, the end of the label must be a character with
995 // BIDI property L or EN, followed by zero or more characters with
996 // BIDI property NSM.
997 if( (firstMask&L_MASK)!=0 ?
998 (lastMask&~L_EN_MASK)!=0 :
999 (lastMask&~R_AL_EN_AN_MASK)!=0
1000 ) {
1001 info.isOkBiDi=FALSE;
1002 }
1003 // Get the directionalities of the intervening characters.
1004 uint32_t mask=0;
1005 while(i<labelLength) {
1006 U16_NEXT_UNSAFE(label, i, c);
1007 mask|=U_MASK(u_charDirection(c));
1008 }
1009 if(firstMask&L_MASK) {
1010 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1011 // ES, CS, ET, ON, BN and NSM are allowed.
1012 if((mask&~L_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1013 info.isOkBiDi=FALSE;
1014 }
1015 } else {
1016 // 2. In an RTL label, only characters with the BIDI properties R, AL,
1017 // AN, EN, ES, CS, ET, ON, BN and NSM are allowed.
1018 if((mask&~R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1019 info.isOkBiDi=FALSE;
1020 }
1021 // 4. In an RTL label, if an EN is present, no AN may be present, and
1022 // vice versa.
1023 if((mask&EN_AN_MASK)==EN_AN_MASK) {
1024 info.isOkBiDi=FALSE;
1025 }
1026 }
1027 // An RTL label is a label that contains at least one character of type
1028 // R, AL or AN. [...]
1029 // A "BIDI domain name" is a domain name that contains at least one RTL
1030 // label. [...]
1031 // The following rule, consisting of six conditions, applies to labels
1032 // in BIDI domain names.
1033 if(((firstMask|mask|lastMask)&R_AL_AN_MASK)!=0) {
1034 info.isBiDi=TRUE;
1035 }
1036 }
1037
1038 // Special code for the ASCII prefix of a BiDi domain name.
1039 // The ASCII prefix is all-LTR.
1040
1041 // IDNA2008 BiDi rule, parts relevant to ASCII labels:
1042 // 1. The first character must be a character with BIDI property L [...]
1043 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1044 // ES, CS, ET, ON, BN and NSM are allowed.
1045 // 6. In an LTR label, the end of the label must be a character with
1046 // BIDI property L or EN [...]
1047
1048 // UTF-16 version, called for mapped ASCII prefix.
1049 // Cannot contain uppercase A-Z.
1050 // s[length-1] must be the trailing dot.
1051 static UBool
1052 isASCIIOkBiDi(const UChar *s, int32_t length) {
1053 int32_t labelStart=0;
1054 for(int32_t i=0; i<length; ++i) {
1055 UChar c=s[i];
1056 if(c==0x2e) { // dot
1057 if(i>labelStart) {
1058 c=s[i-1];
1059 if(!(0x61<=c && c<=0x7a) && !(0x30<=c && c<=0x39)) {
1060 // Last character in the label is not an L or EN.
1061 return FALSE;
1062 }
1063 }
1064 labelStart=i+1;
1065 } else if(i==labelStart) {
1066 if(!(0x61<=c && c<=0x7a)) {
1067 // First character in the label is not an L.
1068 return FALSE;
1069 }
1070 } else {
1071 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1072 // Intermediate character in the label is a B, S or WS.
1073 return FALSE;
1074 }
1075 }
1076 }
1077 return TRUE;
1078 }
1079
1080 // UTF-8 version, called for source ASCII prefix.
1081 // Can contain uppercase A-Z.
1082 // s[length-1] must be the trailing dot.
1083 static UBool
1084 isASCIIOkBiDi(const char *s, int32_t length) {
1085 int32_t labelStart=0;
1086 for(int32_t i=0; i<length; ++i) {
1087 char c=s[i];
1088 if(c==0x2e) { // dot
1089 if(i>labelStart) {
1090 c=s[i-1];
1091 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a) && !(0x30<=c && c<=0x39)) {
1092 // Last character in the label is not an L or EN.
1093 return FALSE;
1094 }
1095 }
1096 labelStart=i+1;
1097 } else if(i==labelStart) {
1098 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a)) {
1099 // First character in the label is not an L.
1100 return FALSE;
1101 }
1102 } else {
1103 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1104 // Intermediate character in the label is a B, S or WS.
1105 return FALSE;
1106 }
1107 }
1108 }
1109 return TRUE;
1110 }
1111
1112 UBool
1113 UTS46::isLabelOkContextJ(const UChar *label, int32_t labelLength) const {
1114 const UBiDiProps *bdp=ubidi_getSingleton();
1115 // [IDNA2008-Tables]
1116 // 200C..200D ; CONTEXTJ # ZERO WIDTH NON-JOINER..ZERO WIDTH JOINER
1117 for(int32_t i=0; i<labelLength; ++i) {
1118 if(label[i]==0x200c) {
1119 // Appendix A.1. ZERO WIDTH NON-JOINER
1120 // Rule Set:
1121 // False;
1122 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1123 // If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C
1124 // (Joining_Type:T)*(Joining_Type:{R,D})) Then True;
1125 if(i==0) {
1126 return FALSE;
1127 }
1128 UChar32 c;
1129 int32_t j=i;
1130 U16_PREV_UNSAFE(label, j, c);
1131 if(uts46Norm2.getCombiningClass(c)==9) {
1132 continue;
1133 }
1134 // check precontext (Joining_Type:{L,D})(Joining_Type:T)*
1135 for(;;) {
1136 UJoiningType type=ubidi_getJoiningType(bdp, c);
1137 if(type==U_JT_TRANSPARENT) {
1138 if(j==0) {
1139 return FALSE;
1140 }
1141 U16_PREV_UNSAFE(label, j, c);
1142 } else if(type==U_JT_LEFT_JOINING || type==U_JT_DUAL_JOINING) {
1143 break; // precontext fulfilled
1144 } else {
1145 return FALSE;
1146 }
1147 }
1148 // check postcontext (Joining_Type:T)*(Joining_Type:{R,D})
1149 for(j=i+1;;) {
1150 if(j==labelLength) {
1151 return FALSE;
1152 }
1153 U16_NEXT_UNSAFE(label, j, c);
1154 UJoiningType type=ubidi_getJoiningType(bdp, c);
1155 if(type==U_JT_TRANSPARENT) {
1156 // just skip this character
1157 } else if(type==U_JT_RIGHT_JOINING || type==U_JT_DUAL_JOINING) {
1158 break; // postcontext fulfilled
1159 } else {
1160 return FALSE;
1161 }
1162 }
1163 } else if(label[i]==0x200d) {
1164 // Appendix A.2. ZERO WIDTH JOINER (U+200D)
1165 // Rule Set:
1166 // False;
1167 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1168 if(i==0) {
1169 return FALSE;
1170 }
1171 UChar32 c;
1172 int32_t j=i;
1173 U16_PREV_UNSAFE(label, j, c);
1174 if(uts46Norm2.getCombiningClass(c)!=9) {
1175 return FALSE;
1176 }
1177 }
1178 }
1179 return TRUE;
1180 }
1181
1182 void
1183 UTS46::checkLabelContextO(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
1184 int32_t labelEnd=labelLength-1; // inclusive
1185 int32_t arabicDigits=0; // -1 for 066x, +1 for 06Fx
1186 for(int32_t i=0; i<=labelEnd; ++i) {
1187 UChar32 c=label[i];
1188 if(c<0xb7) {
1189 // ASCII fastpath
1190 } else if(c<=0x6f9) {
1191 if(c==0xb7) {
1192 // Appendix A.3. MIDDLE DOT (U+00B7)
1193 // Rule Set:
1194 // False;
1195 // If Before(cp) .eq. U+006C And
1196 // After(cp) .eq. U+006C Then True;
1197 if(!(0<i && label[i-1]==0x6c &&
1198 i<labelEnd && label[i+1]==0x6c)) {
1199 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1200 }
1201 } else if(c==0x375) {
1202 // Appendix A.4. GREEK LOWER NUMERAL SIGN (KERAIA) (U+0375)
1203 // Rule Set:
1204 // False;
1205 // If Script(After(cp)) .eq. Greek Then True;
1206 UScriptCode script=USCRIPT_INVALID_CODE;
1207 if(i<labelEnd) {
1208 UErrorCode errorCode=U_ZERO_ERROR;
1209 int32_t j=i+1;
1210 U16_NEXT(label, j, labelLength, c);
1211 script=uscript_getScript(c, &errorCode);
1212 }
1213 if(script!=USCRIPT_GREEK) {
1214 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1215 }
1216 } else if(c==0x5f3 || c==0x5f4) {
1217 // Appendix A.5. HEBREW PUNCTUATION GERESH (U+05F3)
1218 // Rule Set:
1219 // False;
1220 // If Script(Before(cp)) .eq. Hebrew Then True;
1221 //
1222 // Appendix A.6. HEBREW PUNCTUATION GERSHAYIM (U+05F4)
1223 // Rule Set:
1224 // False;
1225 // If Script(Before(cp)) .eq. Hebrew Then True;
1226 UScriptCode script=USCRIPT_INVALID_CODE;
1227 if(0<i) {
1228 UErrorCode errorCode=U_ZERO_ERROR;
1229 int32_t j=i;
1230 U16_PREV(label, 0, j, c);
1231 script=uscript_getScript(c, &errorCode);
1232 }
1233 if(script!=USCRIPT_HEBREW) {
1234 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1235 }
1236 } else if(0x660<=c /* && c<=0x6f9 */) {
1237 // Appendix A.8. ARABIC-INDIC DIGITS (0660..0669)
1238 // Rule Set:
1239 // True;
1240 // For All Characters:
1241 // If cp .in. 06F0..06F9 Then False;
1242 // End For;
1243 //
1244 // Appendix A.9. EXTENDED ARABIC-INDIC DIGITS (06F0..06F9)
1245 // Rule Set:
1246 // True;
1247 // For All Characters:
1248 // If cp .in. 0660..0669 Then False;
1249 // End For;
1250 if(c<=0x669) {
1251 if(arabicDigits>0) {
1252 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1253 }
1254 arabicDigits=-1;
1255 } else if(0x6f0<=c) {
1256 if(arabicDigits<0) {
1257 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1258 }
1259 arabicDigits=1;
1260 }
1261 }
1262 } else if(c==0x30fb) {
1263 // Appendix A.7. KATAKANA MIDDLE DOT (U+30FB)
1264 // Rule Set:
1265 // False;
1266 // For All Characters:
1267 // If Script(cp) .in. {Hiragana, Katakana, Han} Then True;
1268 // End For;
1269 UErrorCode errorCode=U_ZERO_ERROR;
1270 for(int j=0;;) {
1271 if(j>labelEnd) {
1272 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1273 break;
1274 }
1275 U16_NEXT(label, j, labelLength, c);
1276 UScriptCode script=uscript_getScript(c, &errorCode);
1277 if(script==USCRIPT_HIRAGANA || script==USCRIPT_KATAKANA || script==USCRIPT_HAN) {
1278 break;
1279 }
1280 }
1281 }
1282 }
1283 }
1284
1285 U_NAMESPACE_END
1286
1287 // C API ------------------------------------------------------------------- ***
1288
1289 U_NAMESPACE_USE
1290
1291 U_CAPI UIDNA * U_EXPORT2
1292 uidna_openUTS46(uint32_t options, UErrorCode *pErrorCode) {
1293 return reinterpret_cast<UIDNA *>(IDNA::createUTS46Instance(options, *pErrorCode));
1294 }
1295
1296 U_CAPI void U_EXPORT2
1297 uidna_close(UIDNA *idna) {
1298 delete reinterpret_cast<IDNA *>(idna);
1299 }
1300
1301 static UBool
1302 checkArgs(const void *label, int32_t length,
1303 void *dest, int32_t capacity,
1304 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1305 if(U_FAILURE(*pErrorCode)) {
1306 return FALSE;
1307 }
1308 // sizeof(UIDNAInfo)=16 in the first API version.
1309 if(pInfo==NULL || pInfo->size<16) {
1310 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1311 return FALSE;
1312 }
1313 if( (label==NULL ? length!=0 : length<-1) ||
1314 (dest==NULL ? capacity!=0 : capacity<0) ||
1315 (dest==label && label!=NULL)
1316 ) {
1317 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1318 return FALSE;
1319 }
1320 // Set all *pInfo bytes to 0 except for the size field itself.
1321 uprv_memset(&pInfo->size+1, 0, pInfo->size-sizeof(pInfo->size));
1322 return TRUE;
1323 }
1324
1325 static void
1326 idnaInfoToStruct(IDNAInfo &info, UIDNAInfo *pInfo) {
1327 pInfo->isTransitionalDifferent=info.isTransitionalDifferent();
1328 pInfo->errors=info.getErrors();
1329 }
1330
1331 U_CAPI int32_t U_EXPORT2
1332 uidna_labelToASCII(const UIDNA *idna,
1333 const UChar *label, int32_t length,
1334 UChar *dest, int32_t capacity,
1335 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1336 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1337 return 0;
1338 }
1339 UnicodeString src((UBool)(length<0), label, length);
1340 UnicodeString destString(dest, 0, capacity);
1341 IDNAInfo info;
1342 reinterpret_cast<const IDNA *>(idna)->labelToASCII(src, destString, info, *pErrorCode);
1343 idnaInfoToStruct(info, pInfo);
1344 return destString.extract(dest, capacity, *pErrorCode);
1345 }
1346
1347 U_CAPI int32_t U_EXPORT2
1348 uidna_labelToUnicode(const UIDNA *idna,
1349 const UChar *label, int32_t length,
1350 UChar *dest, int32_t capacity,
1351 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1352 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1353 return 0;
1354 }
1355 UnicodeString src((UBool)(length<0), label, length);
1356 UnicodeString destString(dest, 0, capacity);
1357 IDNAInfo info;
1358 reinterpret_cast<const IDNA *>(idna)->labelToUnicode(src, destString, info, *pErrorCode);
1359 idnaInfoToStruct(info, pInfo);
1360 return destString.extract(dest, capacity, *pErrorCode);
1361 }
1362
1363 U_CAPI int32_t U_EXPORT2
1364 uidna_nameToASCII(const UIDNA *idna,
1365 const UChar *name, int32_t length,
1366 UChar *dest, int32_t capacity,
1367 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1368 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1369 return 0;
1370 }
1371 UnicodeString src((UBool)(length<0), name, length);
1372 UnicodeString destString(dest, 0, capacity);
1373 IDNAInfo info;
1374 reinterpret_cast<const IDNA *>(idna)->nameToASCII(src, destString, info, *pErrorCode);
1375 idnaInfoToStruct(info, pInfo);
1376 return destString.extract(dest, capacity, *pErrorCode);
1377 }
1378
1379 U_CAPI int32_t U_EXPORT2
1380 uidna_nameToUnicode(const UIDNA *idna,
1381 const UChar *name, int32_t length,
1382 UChar *dest, int32_t capacity,
1383 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1384 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1385 return 0;
1386 }
1387 UnicodeString src((UBool)(length<0), name, length);
1388 UnicodeString destString(dest, 0, capacity);
1389 IDNAInfo info;
1390 reinterpret_cast<const IDNA *>(idna)->nameToUnicode(src, destString, info, *pErrorCode);
1391 idnaInfoToStruct(info, pInfo);
1392 return destString.extract(dest, capacity, *pErrorCode);
1393 }
1394
1395 U_CAPI int32_t U_EXPORT2
1396 uidna_labelToASCII_UTF8(const UIDNA *idna,
1397 const char *label, int32_t length,
1398 char *dest, int32_t capacity,
1399 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1400 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1401 return 0;
1402 }
1403 StringPiece src(label, length<0 ? uprv_strlen(label) : length);
1404 CheckedArrayByteSink sink(dest, capacity);
1405 IDNAInfo info;
1406 reinterpret_cast<const IDNA *>(idna)->labelToASCII_UTF8(src, sink, info, *pErrorCode);
1407 idnaInfoToStruct(info, pInfo);
1408 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1409 }
1410
1411 U_CAPI int32_t U_EXPORT2
1412 uidna_labelToUnicodeUTF8(const UIDNA *idna,
1413 const char *label, int32_t length,
1414 char *dest, int32_t capacity,
1415 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1416 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1417 return 0;
1418 }
1419 StringPiece src(label, length<0 ? uprv_strlen(label) : length);
1420 CheckedArrayByteSink sink(dest, capacity);
1421 IDNAInfo info;
1422 reinterpret_cast<const IDNA *>(idna)->labelToUnicodeUTF8(src, sink, info, *pErrorCode);
1423 idnaInfoToStruct(info, pInfo);
1424 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1425 }
1426
1427 U_CAPI int32_t U_EXPORT2
1428 uidna_nameToASCII_UTF8(const UIDNA *idna,
1429 const char *name, int32_t length,
1430 char *dest, int32_t capacity,
1431 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1432 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1433 return 0;
1434 }
1435 StringPiece src(name, length<0 ? uprv_strlen(name) : length);
1436 CheckedArrayByteSink sink(dest, capacity);
1437 IDNAInfo info;
1438 reinterpret_cast<const IDNA *>(idna)->nameToASCII_UTF8(src, sink, info, *pErrorCode);
1439 idnaInfoToStruct(info, pInfo);
1440 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1441 }
1442
1443 U_CAPI int32_t U_EXPORT2
1444 uidna_nameToUnicodeUTF8(const UIDNA *idna,
1445 const char *name, int32_t length,
1446 char *dest, int32_t capacity,
1447 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1448 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1449 return 0;
1450 }
1451 StringPiece src(name, length<0 ? uprv_strlen(name) : length);
1452 CheckedArrayByteSink sink(dest, capacity);
1453 IDNAInfo info;
1454 reinterpret_cast<const IDNA *>(idna)->nameToUnicodeUTF8(src, sink, info, *pErrorCode);
1455 idnaInfoToStruct(info, pInfo);
1456 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1457 }
1458
1459 #endif // UCONFIG_NO_IDNA
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