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[apple/icu.git] / icuSources / common / uts46.cpp
1 /*
2 *******************************************************************************
3 * Copyright (C) 2010-2014, 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 if(i==labelStart) {
386 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
387 } else if((i-labelStart)>63) {
388 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
389 }
390 }
391 info.errors|=info.labelErrors;
392 info.labelErrors=0;
393 labelStart=i+1;
394 }
395 }
396 }
397 info.errors|=info.labelErrors;
398 dest.releaseBuffer(i);
399 processUnicode(src, labelStart, i, isLabel, toASCII, dest, info, errorCode);
400 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
401 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(dest.getBuffer(), labelStart)))
402 ) {
403 info.errors|=UIDNA_ERROR_BIDI;
404 }
405 return dest;
406 }
407
408 void
409 UTS46::processUTF8(const StringPiece &src,
410 UBool isLabel, UBool toASCII,
411 ByteSink &dest,
412 IDNAInfo &info, UErrorCode &errorCode) const {
413 if(U_FAILURE(errorCode)) {
414 return;
415 }
416 const char *srcArray=src.data();
417 int32_t srcLength=src.length();
418 if(srcArray==NULL && srcLength!=0) {
419 errorCode=U_ILLEGAL_ARGUMENT_ERROR;
420 return;
421 }
422 // Arguments are fine, reset output values.
423 info.reset();
424 if(srcLength==0) {
425 if(toASCII) {
426 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
427 }
428 dest.Flush();
429 return;
430 }
431 UnicodeString destString;
432 int32_t labelStart=0;
433 if(srcLength<=256) { // length of stackArray[]
434 // ASCII fastpath
435 char stackArray[256];
436 int32_t destCapacity;
437 char *destArray=dest.GetAppendBuffer(srcLength, srcLength+20,
438 stackArray, LENGTHOF(stackArray), &destCapacity);
439 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
440 int32_t i;
441 for(i=0;; ++i) {
442 if(i==srcLength) {
443 if(toASCII) {
444 if((i-labelStart)>63) {
445 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
446 }
447 // There is a trailing dot if labelStart==i.
448 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
449 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
450 }
451 }
452 info.errors|=info.labelErrors;
453 dest.Append(destArray, i);
454 dest.Flush();
455 return;
456 }
457 char c=srcArray[i];
458 if((int8_t)c<0) { // (uint8_t)c>0x7f
459 break;
460 }
461 int cData=asciiData[(int)c]; // Cast: gcc warns about indexing with a char.
462 if(cData>0) {
463 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
464 } else if(cData<0 && disallowNonLDHDot) {
465 break; // Replacing with U+FFFD can be complicated for toASCII.
466 } else {
467 destArray[i]=c;
468 if(c==0x2d) { // hyphen
469 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
470 // "??--..." is Punycode or forbidden.
471 break;
472 }
473 if(i==labelStart) {
474 // label starts with "-"
475 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
476 }
477 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
478 // label ends with "-"
479 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
480 }
481 } else if(c==0x2e) { // dot
482 if(isLabel) {
483 break; // Replacing with U+FFFD can be complicated for toASCII.
484 }
485 if(toASCII) {
486 if(i==labelStart) {
487 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
488 } else if((i-labelStart)>63) {
489 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
490 }
491 }
492 info.errors|=info.labelErrors;
493 info.labelErrors=0;
494 labelStart=i+1;
495 }
496 }
497 }
498 info.errors|=info.labelErrors;
499 // Convert the processed ASCII prefix of the current label to UTF-16.
500 int32_t mappingStart=i-labelStart;
501 destString=UnicodeString::fromUTF8(StringPiece(destArray+labelStart, mappingStart));
502 // Output the previous ASCII labels and process the rest of src in UTF-16.
503 dest.Append(destArray, labelStart);
504 processUnicode(UnicodeString::fromUTF8(StringPiece(src, labelStart)), 0, mappingStart,
505 isLabel, toASCII,
506 destString, info, errorCode);
507 } else {
508 // src is too long for the ASCII fastpath implementation.
509 processUnicode(UnicodeString::fromUTF8(src), 0, 0,
510 isLabel, toASCII,
511 destString, info, errorCode);
512 }
513 destString.toUTF8(dest); // calls dest.Flush()
514 if(toASCII && !isLabel) {
515 // length==labelStart==254 means that there is a trailing dot (ok) and
516 // destString is empty (do not index at 253-labelStart).
517 int32_t length=labelStart+destString.length();
518 if( length>=254 && isASCIIString(destString) &&
519 (length>254 ||
520 (labelStart<254 && destString[253-labelStart]!=0x2e))
521 ) {
522 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
523 }
524 }
525 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
526 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(srcArray, labelStart)))
527 ) {
528 info.errors|=UIDNA_ERROR_BIDI;
529 }
530 }
531
532 UnicodeString &
533 UTS46::processUnicode(const UnicodeString &src,
534 int32_t labelStart, int32_t mappingStart,
535 UBool isLabel, UBool toASCII,
536 UnicodeString &dest,
537 IDNAInfo &info, UErrorCode &errorCode) const {
538 if(mappingStart==0) {
539 uts46Norm2.normalize(src, dest, errorCode);
540 } else {
541 uts46Norm2.normalizeSecondAndAppend(dest, src.tempSubString(mappingStart), errorCode);
542 }
543 if(U_FAILURE(errorCode)) {
544 return dest;
545 }
546 UBool doMapDevChars=
547 toASCII ? (options&UIDNA_NONTRANSITIONAL_TO_ASCII)==0 :
548 (options&UIDNA_NONTRANSITIONAL_TO_UNICODE)==0;
549 const UChar *destArray=dest.getBuffer();
550 int32_t destLength=dest.length();
551 int32_t labelLimit=labelStart;
552 while(labelLimit<destLength) {
553 UChar c=destArray[labelLimit];
554 if(c==0x2e && !isLabel) {
555 int32_t labelLength=labelLimit-labelStart;
556 int32_t newLength=processLabel(dest, labelStart, labelLength,
557 toASCII, info, errorCode);
558 info.errors|=info.labelErrors;
559 info.labelErrors=0;
560 if(U_FAILURE(errorCode)) {
561 return dest;
562 }
563 destArray=dest.getBuffer();
564 destLength+=newLength-labelLength;
565 labelLimit=labelStart+=newLength+1;
566 } else if(0xdf<=c && c<=0x200d && (c==0xdf || c==0x3c2 || c>=0x200c)) {
567 info.isTransDiff=TRUE;
568 if(doMapDevChars) {
569 destLength=mapDevChars(dest, labelStart, labelLimit, errorCode);
570 if(U_FAILURE(errorCode)) {
571 return dest;
572 }
573 destArray=dest.getBuffer();
574 // Do not increment labelLimit in case c was removed.
575 // All deviation characters have been mapped, no need to check for them again.
576 doMapDevChars=FALSE;
577 } else {
578 ++labelLimit;
579 }
580 } else {
581 ++labelLimit;
582 }
583 }
584 // Permit an empty label at the end (0<labelStart==labelLimit==destLength is ok)
585 // but not an empty label elsewhere nor a completely empty domain name.
586 // processLabel() sets UIDNA_ERROR_EMPTY_LABEL when labelLength==0.
587 if(0==labelStart || labelStart<labelLimit) {
588 processLabel(dest, labelStart, labelLimit-labelStart,
589 toASCII, info, errorCode);
590 info.errors|=info.labelErrors;
591 }
592 return dest;
593 }
594
595 int32_t
596 UTS46::mapDevChars(UnicodeString &dest, int32_t labelStart, int32_t mappingStart,
597 UErrorCode &errorCode) const {
598 int32_t length=dest.length();
599 UChar *s=dest.getBuffer(dest[mappingStart]==0xdf ? length+1 : length);
600 if(s==NULL) {
601 errorCode=U_MEMORY_ALLOCATION_ERROR;
602 return length;
603 }
604 int32_t capacity=dest.getCapacity();
605 UBool didMapDevChars=FALSE;
606 int32_t readIndex=mappingStart, writeIndex=mappingStart;
607 do {
608 UChar c=s[readIndex++];
609 switch(c) {
610 case 0xdf:
611 // Map sharp s to ss.
612 didMapDevChars=TRUE;
613 s[writeIndex++]=0x73; // Replace sharp s with first s.
614 // Insert second s and account for possible buffer reallocation.
615 if(writeIndex==readIndex) {
616 if(length==capacity) {
617 dest.releaseBuffer(length);
618 s=dest.getBuffer(length+1);
619 if(s==NULL) {
620 errorCode=U_MEMORY_ALLOCATION_ERROR;
621 return length;
622 }
623 capacity=dest.getCapacity();
624 }
625 u_memmove(s+writeIndex+1, s+writeIndex, length-writeIndex);
626 ++readIndex;
627 }
628 s[writeIndex++]=0x73;
629 ++length;
630 break;
631 case 0x3c2: // Map final sigma to nonfinal sigma.
632 didMapDevChars=TRUE;
633 s[writeIndex++]=0x3c3;
634 break;
635 case 0x200c: // Ignore/remove ZWNJ.
636 case 0x200d: // Ignore/remove ZWJ.
637 didMapDevChars=TRUE;
638 --length;
639 break;
640 default:
641 // Only really necessary if writeIndex was different from readIndex.
642 s[writeIndex++]=c;
643 break;
644 }
645 } while(writeIndex<length);
646 dest.releaseBuffer(length);
647 if(didMapDevChars) {
648 // Mapping deviation characters might have resulted in an un-NFC string.
649 // We could use either the NFC or the UTS #46 normalizer.
650 // By using the UTS #46 normalizer again, we avoid having to load a second .nrm data file.
651 UnicodeString normalized;
652 uts46Norm2.normalize(dest.tempSubString(labelStart), normalized, errorCode);
653 if(U_SUCCESS(errorCode)) {
654 dest.replace(labelStart, 0x7fffffff, normalized);
655 return dest.length();
656 }
657 }
658 return length;
659 }
660
661 // Some non-ASCII characters are equivalent to sequences with
662 // non-LDH ASCII characters. To find them:
663 // grep disallowed_STD3_valid IdnaMappingTable.txt (or uts46.txt)
664 static inline UBool
665 isNonASCIIDisallowedSTD3Valid(UChar32 c) {
666 return c==0x2260 || c==0x226E || c==0x226F;
667 }
668
669 // Replace the label in dest with the label string, if the label was modified.
670 // If &label==&dest then the label was modified in-place and labelLength
671 // is the new label length, different from label.length().
672 // If &label!=&dest then labelLength==label.length().
673 // Returns labelLength (= the new label length).
674 static int32_t
675 replaceLabel(UnicodeString &dest, int32_t destLabelStart, int32_t destLabelLength,
676 const UnicodeString &label, int32_t labelLength) {
677 if(&label!=&dest) {
678 dest.replace(destLabelStart, destLabelLength, label);
679 }
680 return labelLength;
681 }
682
683 int32_t
684 UTS46::processLabel(UnicodeString &dest,
685 int32_t labelStart, int32_t labelLength,
686 UBool toASCII,
687 IDNAInfo &info, UErrorCode &errorCode) const {
688 UnicodeString fromPunycode;
689 UnicodeString *labelString;
690 const UChar *label=dest.getBuffer()+labelStart;
691 int32_t destLabelStart=labelStart;
692 int32_t destLabelLength=labelLength;
693 UBool wasPunycode;
694 if(labelLength>=4 && label[0]==0x78 && label[1]==0x6e && label[2]==0x2d && label[3]==0x2d) {
695 // Label starts with "xn--", try to un-Punycode it.
696 wasPunycode=TRUE;
697 UChar *unicodeBuffer=fromPunycode.getBuffer(-1); // capacity==-1: most labels should fit
698 if(unicodeBuffer==NULL) {
699 // Should never occur if we used capacity==-1 which uses the internal buffer.
700 errorCode=U_MEMORY_ALLOCATION_ERROR;
701 return labelLength;
702 }
703 UErrorCode punycodeErrorCode=U_ZERO_ERROR;
704 int32_t unicodeLength=u_strFromPunycode(label+4, labelLength-4,
705 unicodeBuffer, fromPunycode.getCapacity(),
706 NULL, &punycodeErrorCode);
707 if(punycodeErrorCode==U_BUFFER_OVERFLOW_ERROR) {
708 fromPunycode.releaseBuffer(0);
709 unicodeBuffer=fromPunycode.getBuffer(unicodeLength);
710 if(unicodeBuffer==NULL) {
711 errorCode=U_MEMORY_ALLOCATION_ERROR;
712 return labelLength;
713 }
714 punycodeErrorCode=U_ZERO_ERROR;
715 unicodeLength=u_strFromPunycode(label+4, labelLength-4,
716 unicodeBuffer, fromPunycode.getCapacity(),
717 NULL, &punycodeErrorCode);
718 }
719 fromPunycode.releaseBuffer(unicodeLength);
720 if(U_FAILURE(punycodeErrorCode)) {
721 info.labelErrors|=UIDNA_ERROR_PUNYCODE;
722 return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
723 }
724 // Check for NFC, and for characters that are not
725 // valid or deviation characters according to the normalizer.
726 // If there is something wrong, then the string will change.
727 // Note that the normalizer passes through non-LDH ASCII and deviation characters.
728 // Deviation characters are ok in Punycode even in transitional processing.
729 // In the code further below, if we find non-LDH ASCII and we have UIDNA_USE_STD3_RULES
730 // then we will set UIDNA_ERROR_INVALID_ACE_LABEL there too.
731 UBool isValid=uts46Norm2.isNormalized(fromPunycode, errorCode);
732 if(U_FAILURE(errorCode)) {
733 return labelLength;
734 }
735 if(!isValid) {
736 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
737 return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
738 }
739 labelString=&fromPunycode;
740 label=fromPunycode.getBuffer();
741 labelStart=0;
742 labelLength=fromPunycode.length();
743 } else {
744 wasPunycode=FALSE;
745 labelString=&dest;
746 }
747 // Validity check
748 if(labelLength==0) {
749 if(toASCII) {
750 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
751 }
752 return replaceLabel(dest, destLabelStart, destLabelLength, *labelString, labelLength);
753 }
754 // labelLength>0
755 if(labelLength>=4 && label[2]==0x2d && label[3]==0x2d) {
756 // label starts with "??--"
757 info.labelErrors|=UIDNA_ERROR_HYPHEN_3_4;
758 }
759 if(label[0]==0x2d) {
760 // label starts with "-"
761 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
762 }
763 if(label[labelLength-1]==0x2d) {
764 // label ends with "-"
765 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
766 }
767 // If the label was not a Punycode label, then it was the result of
768 // mapping, normalization and label segmentation.
769 // If the label was in Punycode, then we mapped it again above
770 // and checked its validity.
771 // Now we handle the STD3 restriction to LDH characters (if set)
772 // and we look for U+FFFD which indicates disallowed characters
773 // in a non-Punycode label or U+FFFD itself in a Punycode label.
774 // We also check for dots which can come from the input to a single-label function.
775 // Ok to cast away const because we own the UnicodeString.
776 UChar *s=(UChar *)label;
777 const UChar *limit=label+labelLength;
778 UChar oredChars=0;
779 // If we enforce STD3 rules, then ASCII characters other than LDH and dot are disallowed.
780 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
781 do {
782 UChar c=*s;
783 if(c<=0x7f) {
784 if(c==0x2e) {
785 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
786 *s=0xfffd;
787 } else if(disallowNonLDHDot && asciiData[c]<0) {
788 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
789 *s=0xfffd;
790 }
791 } else {
792 oredChars|=c;
793 if(disallowNonLDHDot && isNonASCIIDisallowedSTD3Valid(c)) {
794 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
795 *s=0xfffd;
796 } else if(c==0xfffd) {
797 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
798 }
799 }
800 ++s;
801 } while(s<limit);
802 // Check for a leading combining mark after other validity checks
803 // so that we don't report UIDNA_ERROR_DISALLOWED for the U+FFFD from here.
804 UChar32 c;
805 int32_t cpLength=0;
806 // "Unsafe" is ok because unpaired surrogates were mapped to U+FFFD.
807 U16_NEXT_UNSAFE(label, cpLength, c);
808 if((U_GET_GC_MASK(c)&U_GC_M_MASK)!=0) {
809 info.labelErrors|=UIDNA_ERROR_LEADING_COMBINING_MARK;
810 labelString->replace(labelStart, cpLength, (UChar)0xfffd);
811 label=labelString->getBuffer()+labelStart;
812 labelLength+=1-cpLength;
813 if(labelString==&dest) {
814 destLabelLength=labelLength;
815 }
816 }
817 if((info.labelErrors&severeErrors)==0) {
818 // Do contextual checks only if we do not have U+FFFD from a severe error
819 // because U+FFFD can make these checks fail.
820 if((options&UIDNA_CHECK_BIDI)!=0 && (!info.isBiDi || info.isOkBiDi)) {
821 checkLabelBiDi(label, labelLength, info);
822 }
823 if( (options&UIDNA_CHECK_CONTEXTJ)!=0 && (oredChars&0x200c)==0x200c &&
824 !isLabelOkContextJ(label, labelLength)
825 ) {
826 info.labelErrors|=UIDNA_ERROR_CONTEXTJ;
827 }
828 if((options&UIDNA_CHECK_CONTEXTO)!=0 && oredChars>=0xb7) {
829 checkLabelContextO(label, labelLength, info);
830 }
831 if(toASCII) {
832 if(wasPunycode) {
833 // Leave a Punycode label unchanged if it has no severe errors.
834 if(destLabelLength>63) {
835 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
836 }
837 return destLabelLength;
838 } else if(oredChars>=0x80) {
839 // Contains non-ASCII characters.
840 UnicodeString punycode;
841 UChar *buffer=punycode.getBuffer(63); // 63==maximum DNS label length
842 if(buffer==NULL) {
843 errorCode=U_MEMORY_ALLOCATION_ERROR;
844 return destLabelLength;
845 }
846 buffer[0]=0x78; // Write "xn--".
847 buffer[1]=0x6e;
848 buffer[2]=0x2d;
849 buffer[3]=0x2d;
850 int32_t punycodeLength=u_strToPunycode(label, labelLength,
851 buffer+4, punycode.getCapacity()-4,
852 NULL, &errorCode);
853 if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
854 errorCode=U_ZERO_ERROR;
855 punycode.releaseBuffer(4);
856 buffer=punycode.getBuffer(4+punycodeLength);
857 if(buffer==NULL) {
858 errorCode=U_MEMORY_ALLOCATION_ERROR;
859 return destLabelLength;
860 }
861 punycodeLength=u_strToPunycode(label, labelLength,
862 buffer+4, punycode.getCapacity()-4,
863 NULL, &errorCode);
864 }
865 punycodeLength+=4;
866 punycode.releaseBuffer(punycodeLength);
867 if(U_FAILURE(errorCode)) {
868 return destLabelLength;
869 }
870 if(punycodeLength>63) {
871 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
872 }
873 return replaceLabel(dest, destLabelStart, destLabelLength,
874 punycode, punycodeLength);
875 } else {
876 // all-ASCII label
877 if(labelLength>63) {
878 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
879 }
880 }
881 }
882 } else {
883 // If a Punycode label has severe errors,
884 // then leave it but make sure it does not look valid.
885 if(wasPunycode) {
886 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
887 return markBadACELabel(dest, destLabelStart, destLabelLength, toASCII, info);
888 }
889 }
890 return replaceLabel(dest, destLabelStart, destLabelLength, *labelString, labelLength);
891 }
892
893 // Make sure an ACE label does not look valid.
894 // Append U+FFFD if the label has only LDH characters.
895 // If UIDNA_USE_STD3_RULES, also replace disallowed ASCII characters with U+FFFD.
896 int32_t
897 UTS46::markBadACELabel(UnicodeString &dest,
898 int32_t labelStart, int32_t labelLength,
899 UBool toASCII, IDNAInfo &info) const {
900 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
901 UBool isASCII=TRUE;
902 UBool onlyLDH=TRUE;
903 const UChar *label=dest.getBuffer()+labelStart;
904 // Ok to cast away const because we own the UnicodeString.
905 UChar *s=(UChar *)label+4; // After the initial "xn--".
906 const UChar *limit=label+labelLength;
907 do {
908 UChar c=*s;
909 if(c<=0x7f) {
910 if(c==0x2e) {
911 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
912 *s=0xfffd;
913 isASCII=onlyLDH=FALSE;
914 } else if(asciiData[c]<0) {
915 onlyLDH=FALSE;
916 if(disallowNonLDHDot) {
917 *s=0xfffd;
918 isASCII=FALSE;
919 }
920 }
921 } else {
922 isASCII=onlyLDH=FALSE;
923 }
924 } while(++s<limit);
925 if(onlyLDH) {
926 dest.insert(labelStart+labelLength, (UChar)0xfffd);
927 ++labelLength;
928 } else {
929 if(toASCII && isASCII && labelLength>63) {
930 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
931 }
932 }
933 return labelLength;
934 }
935
936 const uint32_t L_MASK=U_MASK(U_LEFT_TO_RIGHT);
937 const uint32_t R_AL_MASK=U_MASK(U_RIGHT_TO_LEFT)|U_MASK(U_RIGHT_TO_LEFT_ARABIC);
938 const uint32_t L_R_AL_MASK=L_MASK|R_AL_MASK;
939
940 const uint32_t R_AL_AN_MASK=R_AL_MASK|U_MASK(U_ARABIC_NUMBER);
941
942 const uint32_t EN_AN_MASK=U_MASK(U_EUROPEAN_NUMBER)|U_MASK(U_ARABIC_NUMBER);
943 const uint32_t R_AL_EN_AN_MASK=R_AL_MASK|EN_AN_MASK;
944 const uint32_t L_EN_MASK=L_MASK|U_MASK(U_EUROPEAN_NUMBER);
945
946 const uint32_t ES_CS_ET_ON_BN_NSM_MASK=
947 U_MASK(U_EUROPEAN_NUMBER_SEPARATOR)|
948 U_MASK(U_COMMON_NUMBER_SEPARATOR)|
949 U_MASK(U_EUROPEAN_NUMBER_TERMINATOR)|
950 U_MASK(U_OTHER_NEUTRAL)|
951 U_MASK(U_BOUNDARY_NEUTRAL)|
952 U_MASK(U_DIR_NON_SPACING_MARK);
953 const uint32_t L_EN_ES_CS_ET_ON_BN_NSM_MASK=L_EN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
954 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;
955
956 // We scan the whole label and check both for whether it contains RTL characters
957 // and whether it passes the BiDi Rule.
958 // In a BiDi domain name, all labels must pass the BiDi Rule, but we might find
959 // that a domain name is a BiDi domain name (has an RTL label) only after
960 // processing several earlier labels.
961 void
962 UTS46::checkLabelBiDi(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
963 // IDNA2008 BiDi rule
964 // Get the directionality of the first character.
965 UChar32 c;
966 int32_t i=0;
967 U16_NEXT_UNSAFE(label, i, c);
968 uint32_t firstMask=U_MASK(u_charDirection(c));
969 // 1. The first character must be a character with BIDI property L, R
970 // or AL. If it has the R or AL property, it is an RTL label; if it
971 // has the L property, it is an LTR label.
972 if((firstMask&~L_R_AL_MASK)!=0) {
973 info.isOkBiDi=FALSE;
974 }
975 // Get the directionality of the last non-NSM character.
976 uint32_t lastMask;
977 for(;;) {
978 if(i>=labelLength) {
979 lastMask=firstMask;
980 break;
981 }
982 U16_PREV_UNSAFE(label, labelLength, c);
983 UCharDirection dir=u_charDirection(c);
984 if(dir!=U_DIR_NON_SPACING_MARK) {
985 lastMask=U_MASK(dir);
986 break;
987 }
988 }
989 // 3. In an RTL label, the end of the label must be a character with
990 // BIDI property R, AL, EN or AN, followed by zero or more
991 // characters with BIDI property NSM.
992 // 6. In an LTR label, the end of the label must be a character with
993 // BIDI property L or EN, followed by zero or more characters with
994 // BIDI property NSM.
995 if( (firstMask&L_MASK)!=0 ?
996 (lastMask&~L_EN_MASK)!=0 :
997 (lastMask&~R_AL_EN_AN_MASK)!=0
998 ) {
999 info.isOkBiDi=FALSE;
1000 }
1001 // Get the directionalities of the intervening characters.
1002 uint32_t mask=0;
1003 while(i<labelLength) {
1004 U16_NEXT_UNSAFE(label, i, c);
1005 mask|=U_MASK(u_charDirection(c));
1006 }
1007 if(firstMask&L_MASK) {
1008 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1009 // ES, CS, ET, ON, BN and NSM are allowed.
1010 if((mask&~L_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1011 info.isOkBiDi=FALSE;
1012 }
1013 } else {
1014 // 2. In an RTL label, only characters with the BIDI properties R, AL,
1015 // AN, EN, ES, CS, ET, ON, BN and NSM are allowed.
1016 if((mask&~R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1017 info.isOkBiDi=FALSE;
1018 }
1019 // 4. In an RTL label, if an EN is present, no AN may be present, and
1020 // vice versa.
1021 if((mask&EN_AN_MASK)==EN_AN_MASK) {
1022 info.isOkBiDi=FALSE;
1023 }
1024 }
1025 // An RTL label is a label that contains at least one character of type
1026 // R, AL or AN. [...]
1027 // A "BIDI domain name" is a domain name that contains at least one RTL
1028 // label. [...]
1029 // The following rule, consisting of six conditions, applies to labels
1030 // in BIDI domain names.
1031 if(((firstMask|mask|lastMask)&R_AL_AN_MASK)!=0) {
1032 info.isBiDi=TRUE;
1033 }
1034 }
1035
1036 // Special code for the ASCII prefix of a BiDi domain name.
1037 // The ASCII prefix is all-LTR.
1038
1039 // IDNA2008 BiDi rule, parts relevant to ASCII labels:
1040 // 1. The first character must be a character with BIDI property L [...]
1041 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1042 // ES, CS, ET, ON, BN and NSM are allowed.
1043 // 6. In an LTR label, the end of the label must be a character with
1044 // BIDI property L or EN [...]
1045
1046 // UTF-16 version, called for mapped ASCII prefix.
1047 // Cannot contain uppercase A-Z.
1048 // s[length-1] must be the trailing dot.
1049 static UBool
1050 isASCIIOkBiDi(const UChar *s, int32_t length) {
1051 int32_t labelStart=0;
1052 for(int32_t i=0; i<length; ++i) {
1053 UChar c=s[i];
1054 if(c==0x2e) { // dot
1055 if(i>labelStart) {
1056 c=s[i-1];
1057 if(!(0x61<=c && c<=0x7a) && !(0x30<=c && c<=0x39)) {
1058 // Last character in the label is not an L or EN.
1059 return FALSE;
1060 }
1061 }
1062 labelStart=i+1;
1063 } else if(i==labelStart) {
1064 if(!(0x61<=c && c<=0x7a)) {
1065 // First character in the label is not an L.
1066 return FALSE;
1067 }
1068 } else {
1069 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1070 // Intermediate character in the label is a B, S or WS.
1071 return FALSE;
1072 }
1073 }
1074 }
1075 return TRUE;
1076 }
1077
1078 // UTF-8 version, called for source ASCII prefix.
1079 // Can contain uppercase A-Z.
1080 // s[length-1] must be the trailing dot.
1081 static UBool
1082 isASCIIOkBiDi(const char *s, int32_t length) {
1083 int32_t labelStart=0;
1084 for(int32_t i=0; i<length; ++i) {
1085 char c=s[i];
1086 if(c==0x2e) { // dot
1087 if(i>labelStart) {
1088 c=s[i-1];
1089 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a) && !(0x30<=c && c<=0x39)) {
1090 // Last character in the label is not an L or EN.
1091 return FALSE;
1092 }
1093 }
1094 labelStart=i+1;
1095 } else if(i==labelStart) {
1096 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a)) {
1097 // First character in the label is not an L.
1098 return FALSE;
1099 }
1100 } else {
1101 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1102 // Intermediate character in the label is a B, S or WS.
1103 return FALSE;
1104 }
1105 }
1106 }
1107 return TRUE;
1108 }
1109
1110 UBool
1111 UTS46::isLabelOkContextJ(const UChar *label, int32_t labelLength) const {
1112 const UBiDiProps *bdp=ubidi_getSingleton();
1113 // [IDNA2008-Tables]
1114 // 200C..200D ; CONTEXTJ # ZERO WIDTH NON-JOINER..ZERO WIDTH JOINER
1115 for(int32_t i=0; i<labelLength; ++i) {
1116 if(label[i]==0x200c) {
1117 // Appendix A.1. ZERO WIDTH NON-JOINER
1118 // Rule Set:
1119 // False;
1120 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1121 // If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C
1122 // (Joining_Type:T)*(Joining_Type:{R,D})) Then True;
1123 if(i==0) {
1124 return FALSE;
1125 }
1126 UChar32 c;
1127 int32_t j=i;
1128 U16_PREV_UNSAFE(label, j, c);
1129 if(uts46Norm2.getCombiningClass(c)==9) {
1130 continue;
1131 }
1132 // check precontext (Joining_Type:{L,D})(Joining_Type:T)*
1133 for(;;) {
1134 UJoiningType type=ubidi_getJoiningType(bdp, c);
1135 if(type==U_JT_TRANSPARENT) {
1136 if(j==0) {
1137 return FALSE;
1138 }
1139 U16_PREV_UNSAFE(label, j, c);
1140 } else if(type==U_JT_LEFT_JOINING || type==U_JT_DUAL_JOINING) {
1141 break; // precontext fulfilled
1142 } else {
1143 return FALSE;
1144 }
1145 }
1146 // check postcontext (Joining_Type:T)*(Joining_Type:{R,D})
1147 for(j=i+1;;) {
1148 if(j==labelLength) {
1149 return FALSE;
1150 }
1151 U16_NEXT_UNSAFE(label, j, c);
1152 UJoiningType type=ubidi_getJoiningType(bdp, c);
1153 if(type==U_JT_TRANSPARENT) {
1154 // just skip this character
1155 } else if(type==U_JT_RIGHT_JOINING || type==U_JT_DUAL_JOINING) {
1156 break; // postcontext fulfilled
1157 } else {
1158 return FALSE;
1159 }
1160 }
1161 } else if(label[i]==0x200d) {
1162 // Appendix A.2. ZERO WIDTH JOINER (U+200D)
1163 // Rule Set:
1164 // False;
1165 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1166 if(i==0) {
1167 return FALSE;
1168 }
1169 UChar32 c;
1170 int32_t j=i;
1171 U16_PREV_UNSAFE(label, j, c);
1172 if(uts46Norm2.getCombiningClass(c)!=9) {
1173 return FALSE;
1174 }
1175 }
1176 }
1177 return TRUE;
1178 }
1179
1180 void
1181 UTS46::checkLabelContextO(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
1182 int32_t labelEnd=labelLength-1; // inclusive
1183 int32_t arabicDigits=0; // -1 for 066x, +1 for 06Fx
1184 for(int32_t i=0; i<=labelEnd; ++i) {
1185 UChar32 c=label[i];
1186 if(c<0xb7) {
1187 // ASCII fastpath
1188 } else if(c<=0x6f9) {
1189 if(c==0xb7) {
1190 // Appendix A.3. MIDDLE DOT (U+00B7)
1191 // Rule Set:
1192 // False;
1193 // If Before(cp) .eq. U+006C And
1194 // After(cp) .eq. U+006C Then True;
1195 if(!(0<i && label[i-1]==0x6c &&
1196 i<labelEnd && label[i+1]==0x6c)) {
1197 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1198 }
1199 } else if(c==0x375) {
1200 // Appendix A.4. GREEK LOWER NUMERAL SIGN (KERAIA) (U+0375)
1201 // Rule Set:
1202 // False;
1203 // If Script(After(cp)) .eq. Greek Then True;
1204 UScriptCode script=USCRIPT_INVALID_CODE;
1205 if(i<labelEnd) {
1206 UErrorCode errorCode=U_ZERO_ERROR;
1207 int32_t j=i+1;
1208 U16_NEXT(label, j, labelLength, c);
1209 script=uscript_getScript(c, &errorCode);
1210 }
1211 if(script!=USCRIPT_GREEK) {
1212 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1213 }
1214 } else if(c==0x5f3 || c==0x5f4) {
1215 // Appendix A.5. HEBREW PUNCTUATION GERESH (U+05F3)
1216 // Rule Set:
1217 // False;
1218 // If Script(Before(cp)) .eq. Hebrew Then True;
1219 //
1220 // Appendix A.6. HEBREW PUNCTUATION GERSHAYIM (U+05F4)
1221 // Rule Set:
1222 // False;
1223 // If Script(Before(cp)) .eq. Hebrew Then True;
1224 UScriptCode script=USCRIPT_INVALID_CODE;
1225 if(0<i) {
1226 UErrorCode errorCode=U_ZERO_ERROR;
1227 int32_t j=i;
1228 U16_PREV(label, 0, j, c);
1229 script=uscript_getScript(c, &errorCode);
1230 }
1231 if(script!=USCRIPT_HEBREW) {
1232 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1233 }
1234 } else if(0x660<=c /* && c<=0x6f9 */) {
1235 // Appendix A.8. ARABIC-INDIC DIGITS (0660..0669)
1236 // Rule Set:
1237 // True;
1238 // For All Characters:
1239 // If cp .in. 06F0..06F9 Then False;
1240 // End For;
1241 //
1242 // Appendix A.9. EXTENDED ARABIC-INDIC DIGITS (06F0..06F9)
1243 // Rule Set:
1244 // True;
1245 // For All Characters:
1246 // If cp .in. 0660..0669 Then False;
1247 // End For;
1248 if(c<=0x669) {
1249 if(arabicDigits>0) {
1250 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1251 }
1252 arabicDigits=-1;
1253 } else if(0x6f0<=c) {
1254 if(arabicDigits<0) {
1255 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1256 }
1257 arabicDigits=1;
1258 }
1259 }
1260 } else if(c==0x30fb) {
1261 // Appendix A.7. KATAKANA MIDDLE DOT (U+30FB)
1262 // Rule Set:
1263 // False;
1264 // For All Characters:
1265 // If Script(cp) .in. {Hiragana, Katakana, Han} Then True;
1266 // End For;
1267 UErrorCode errorCode=U_ZERO_ERROR;
1268 for(int j=0;;) {
1269 if(j>labelEnd) {
1270 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1271 break;
1272 }
1273 U16_NEXT(label, j, labelLength, c);
1274 UScriptCode script=uscript_getScript(c, &errorCode);
1275 if(script==USCRIPT_HIRAGANA || script==USCRIPT_KATAKANA || script==USCRIPT_HAN) {
1276 break;
1277 }
1278 }
1279 }
1280 }
1281 }
1282
1283 U_NAMESPACE_END
1284
1285 // C API ------------------------------------------------------------------- ***
1286
1287 U_NAMESPACE_USE
1288
1289 U_CAPI UIDNA * U_EXPORT2
1290 uidna_openUTS46(uint32_t options, UErrorCode *pErrorCode) {
1291 return reinterpret_cast<UIDNA *>(IDNA::createUTS46Instance(options, *pErrorCode));
1292 }
1293
1294 U_CAPI void U_EXPORT2
1295 uidna_close(UIDNA *idna) {
1296 delete reinterpret_cast<IDNA *>(idna);
1297 }
1298
1299 static UBool
1300 checkArgs(const void *label, int32_t length,
1301 void *dest, int32_t capacity,
1302 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1303 if(U_FAILURE(*pErrorCode)) {
1304 return FALSE;
1305 }
1306 // sizeof(UIDNAInfo)=16 in the first API version.
1307 if(pInfo==NULL || pInfo->size<16) {
1308 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1309 return FALSE;
1310 }
1311 if( (label==NULL ? length!=0 : length<-1) ||
1312 (dest==NULL ? capacity!=0 : capacity<0) ||
1313 (dest==label && label!=NULL)
1314 ) {
1315 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1316 return FALSE;
1317 }
1318 // Set all *pInfo bytes to 0 except for the size field itself.
1319 uprv_memset(&pInfo->size+1, 0, pInfo->size-sizeof(pInfo->size));
1320 return TRUE;
1321 }
1322
1323 static void
1324 idnaInfoToStruct(IDNAInfo &info, UIDNAInfo *pInfo) {
1325 pInfo->isTransitionalDifferent=info.isTransitionalDifferent();
1326 pInfo->errors=info.getErrors();
1327 }
1328
1329 U_CAPI int32_t U_EXPORT2
1330 uidna_labelToASCII(const UIDNA *idna,
1331 const UChar *label, int32_t length,
1332 UChar *dest, int32_t capacity,
1333 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1334 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1335 return 0;
1336 }
1337 UnicodeString src((UBool)(length<0), label, length);
1338 UnicodeString destString(dest, 0, capacity);
1339 IDNAInfo info;
1340 reinterpret_cast<const IDNA *>(idna)->labelToASCII(src, destString, info, *pErrorCode);
1341 idnaInfoToStruct(info, pInfo);
1342 return destString.extract(dest, capacity, *pErrorCode);
1343 }
1344
1345 U_CAPI int32_t U_EXPORT2
1346 uidna_labelToUnicode(const UIDNA *idna,
1347 const UChar *label, int32_t length,
1348 UChar *dest, int32_t capacity,
1349 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1350 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1351 return 0;
1352 }
1353 UnicodeString src((UBool)(length<0), label, length);
1354 UnicodeString destString(dest, 0, capacity);
1355 IDNAInfo info;
1356 reinterpret_cast<const IDNA *>(idna)->labelToUnicode(src, destString, info, *pErrorCode);
1357 idnaInfoToStruct(info, pInfo);
1358 return destString.extract(dest, capacity, *pErrorCode);
1359 }
1360
1361 U_CAPI int32_t U_EXPORT2
1362 uidna_nameToASCII(const UIDNA *idna,
1363 const UChar *name, int32_t length,
1364 UChar *dest, int32_t capacity,
1365 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1366 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1367 return 0;
1368 }
1369 UnicodeString src((UBool)(length<0), name, length);
1370 UnicodeString destString(dest, 0, capacity);
1371 IDNAInfo info;
1372 reinterpret_cast<const IDNA *>(idna)->nameToASCII(src, destString, info, *pErrorCode);
1373 idnaInfoToStruct(info, pInfo);
1374 return destString.extract(dest, capacity, *pErrorCode);
1375 }
1376
1377 U_CAPI int32_t U_EXPORT2
1378 uidna_nameToUnicode(const UIDNA *idna,
1379 const UChar *name, int32_t length,
1380 UChar *dest, int32_t capacity,
1381 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1382 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1383 return 0;
1384 }
1385 UnicodeString src((UBool)(length<0), name, length);
1386 UnicodeString destString(dest, 0, capacity);
1387 IDNAInfo info;
1388 reinterpret_cast<const IDNA *>(idna)->nameToUnicode(src, destString, info, *pErrorCode);
1389 idnaInfoToStruct(info, pInfo);
1390 return destString.extract(dest, capacity, *pErrorCode);
1391 }
1392
1393 U_CAPI int32_t U_EXPORT2
1394 uidna_labelToASCII_UTF8(const UIDNA *idna,
1395 const char *label, int32_t length,
1396 char *dest, int32_t capacity,
1397 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1398 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1399 return 0;
1400 }
1401 StringPiece src(label, length<0 ? uprv_strlen(label) : length);
1402 CheckedArrayByteSink sink(dest, capacity);
1403 IDNAInfo info;
1404 reinterpret_cast<const IDNA *>(idna)->labelToASCII_UTF8(src, sink, info, *pErrorCode);
1405 idnaInfoToStruct(info, pInfo);
1406 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1407 }
1408
1409 U_CAPI int32_t U_EXPORT2
1410 uidna_labelToUnicodeUTF8(const UIDNA *idna,
1411 const char *label, int32_t length,
1412 char *dest, int32_t capacity,
1413 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1414 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1415 return 0;
1416 }
1417 StringPiece src(label, length<0 ? uprv_strlen(label) : length);
1418 CheckedArrayByteSink sink(dest, capacity);
1419 IDNAInfo info;
1420 reinterpret_cast<const IDNA *>(idna)->labelToUnicodeUTF8(src, sink, info, *pErrorCode);
1421 idnaInfoToStruct(info, pInfo);
1422 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1423 }
1424
1425 U_CAPI int32_t U_EXPORT2
1426 uidna_nameToASCII_UTF8(const UIDNA *idna,
1427 const char *name, int32_t length,
1428 char *dest, int32_t capacity,
1429 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1430 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1431 return 0;
1432 }
1433 StringPiece src(name, length<0 ? uprv_strlen(name) : length);
1434 CheckedArrayByteSink sink(dest, capacity);
1435 IDNAInfo info;
1436 reinterpret_cast<const IDNA *>(idna)->nameToASCII_UTF8(src, sink, info, *pErrorCode);
1437 idnaInfoToStruct(info, pInfo);
1438 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1439 }
1440
1441 U_CAPI int32_t U_EXPORT2
1442 uidna_nameToUnicodeUTF8(const UIDNA *idna,
1443 const char *name, int32_t length,
1444 char *dest, int32_t capacity,
1445 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1446 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1447 return 0;
1448 }
1449 StringPiece src(name, length<0 ? uprv_strlen(name) : length);
1450 CheckedArrayByteSink sink(dest, capacity);
1451 IDNAInfo info;
1452 reinterpret_cast<const IDNA *>(idna)->nameToUnicodeUTF8(src, sink, info, *pErrorCode);
1453 idnaInfoToStruct(info, pInfo);
1454 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1455 }
1456
1457 #endif // UCONFIG_NO_IDNA
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