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[apple/icu.git] / icuSources / common / uts46.cpp
1 /*
2 *******************************************************************************
3 * Copyright (C) 2010-2015, 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 // Note about tests for UIDNA_ERROR_DOMAIN_NAME_TOO_LONG:
31 //
32 // The domain name length limit is 255 octets in an internal DNS representation
33 // where the last ("root") label is the empty label
34 // represented by length byte 0 alone.
35 // In a conventional string, this translates to 253 characters, or 254
36 // if there is a trailing dot for the root label.
37
38 U_NAMESPACE_BEGIN
39
40 // Severe errors which usually result in a U+FFFD replacement character in the result string.
41 const uint32_t severeErrors=
42 UIDNA_ERROR_LEADING_COMBINING_MARK|
43 UIDNA_ERROR_DISALLOWED|
44 UIDNA_ERROR_PUNYCODE|
45 UIDNA_ERROR_LABEL_HAS_DOT|
46 UIDNA_ERROR_INVALID_ACE_LABEL;
47
48 static inline UBool
49 isASCIIString(const UnicodeString &dest) {
50 const UChar *s=dest.getBuffer();
51 const UChar *limit=s+dest.length();
52 while(s<limit) {
53 if(*s++>0x7f) {
54 return FALSE;
55 }
56 }
57 return TRUE;
58 }
59
60 static UBool
61 isASCIIOkBiDi(const UChar *s, int32_t length);
62
63 static UBool
64 isASCIIOkBiDi(const char *s, int32_t length);
65
66 // IDNA class default implementations -------------------------------------- ***
67
68 IDNA::~IDNA() {}
69
70 void
71 IDNA::labelToASCII_UTF8(const StringPiece &label, ByteSink &dest,
72 IDNAInfo &info, UErrorCode &errorCode) const {
73 if(U_SUCCESS(errorCode)) {
74 UnicodeString destString;
75 labelToASCII(UnicodeString::fromUTF8(label), destString,
76 info, errorCode).toUTF8(dest);
77 }
78 }
79
80 void
81 IDNA::labelToUnicodeUTF8(const StringPiece &label, ByteSink &dest,
82 IDNAInfo &info, UErrorCode &errorCode) const {
83 if(U_SUCCESS(errorCode)) {
84 UnicodeString destString;
85 labelToUnicode(UnicodeString::fromUTF8(label), destString,
86 info, errorCode).toUTF8(dest);
87 }
88 }
89
90 void
91 IDNA::nameToASCII_UTF8(const StringPiece &name, ByteSink &dest,
92 IDNAInfo &info, UErrorCode &errorCode) const {
93 if(U_SUCCESS(errorCode)) {
94 UnicodeString destString;
95 nameToASCII(UnicodeString::fromUTF8(name), destString,
96 info, errorCode).toUTF8(dest);
97 }
98 }
99
100 void
101 IDNA::nameToUnicodeUTF8(const StringPiece &name, ByteSink &dest,
102 IDNAInfo &info, UErrorCode &errorCode) const {
103 if(U_SUCCESS(errorCode)) {
104 UnicodeString destString;
105 nameToUnicode(UnicodeString::fromUTF8(name), destString,
106 info, errorCode).toUTF8(dest);
107 }
108 }
109
110 // UTS46 class declaration ------------------------------------------------- ***
111
112 class UTS46 : public IDNA {
113 public:
114 UTS46(uint32_t options, UErrorCode &errorCode);
115 virtual ~UTS46();
116
117 virtual UnicodeString &
118 labelToASCII(const UnicodeString &label, UnicodeString &dest,
119 IDNAInfo &info, UErrorCode &errorCode) const;
120
121 virtual UnicodeString &
122 labelToUnicode(const UnicodeString &label, UnicodeString &dest,
123 IDNAInfo &info, UErrorCode &errorCode) const;
124
125 virtual UnicodeString &
126 nameToASCII(const UnicodeString &name, UnicodeString &dest,
127 IDNAInfo &info, UErrorCode &errorCode) const;
128
129 virtual UnicodeString &
130 nameToUnicode(const UnicodeString &name, UnicodeString &dest,
131 IDNAInfo &info, UErrorCode &errorCode) const;
132
133 virtual void
134 labelToASCII_UTF8(const StringPiece &label, ByteSink &dest,
135 IDNAInfo &info, UErrorCode &errorCode) const;
136
137 virtual void
138 labelToUnicodeUTF8(const StringPiece &label, ByteSink &dest,
139 IDNAInfo &info, UErrorCode &errorCode) const;
140
141 virtual void
142 nameToASCII_UTF8(const StringPiece &name, ByteSink &dest,
143 IDNAInfo &info, UErrorCode &errorCode) const;
144
145 virtual void
146 nameToUnicodeUTF8(const StringPiece &name, ByteSink &dest,
147 IDNAInfo &info, UErrorCode &errorCode) const;
148
149 private:
150 UnicodeString &
151 process(const UnicodeString &src,
152 UBool isLabel, UBool toASCII,
153 UnicodeString &dest,
154 IDNAInfo &info, UErrorCode &errorCode) const;
155
156 void
157 processUTF8(const StringPiece &src,
158 UBool isLabel, UBool toASCII,
159 ByteSink &dest,
160 IDNAInfo &info, UErrorCode &errorCode) const;
161
162 UnicodeString &
163 processUnicode(const UnicodeString &src,
164 int32_t labelStart, int32_t mappingStart,
165 UBool isLabel, UBool toASCII,
166 UnicodeString &dest,
167 IDNAInfo &info, UErrorCode &errorCode) const;
168
169 // returns the new dest.length()
170 int32_t
171 mapDevChars(UnicodeString &dest, int32_t labelStart, int32_t mappingStart,
172 UErrorCode &errorCode) const;
173
174 // returns the new label length
175 int32_t
176 processLabel(UnicodeString &dest,
177 int32_t labelStart, int32_t labelLength,
178 UBool toASCII,
179 IDNAInfo &info, UErrorCode &errorCode) const;
180 int32_t
181 markBadACELabel(UnicodeString &dest,
182 int32_t labelStart, int32_t labelLength,
183 UBool toASCII, IDNAInfo &info, UErrorCode &errorCode) const;
184
185 void
186 checkLabelBiDi(const UChar *label, int32_t labelLength, IDNAInfo &info) const;
187
188 UBool
189 isLabelOkContextJ(const UChar *label, int32_t labelLength) const;
190
191 void
192 checkLabelContextO(const UChar *label, int32_t labelLength, IDNAInfo &info) const;
193
194 const Normalizer2 &uts46Norm2; // uts46.nrm
195 uint32_t options;
196 };
197
198 IDNA *
199 IDNA::createUTS46Instance(uint32_t options, UErrorCode &errorCode) {
200 if(U_SUCCESS(errorCode)) {
201 IDNA *idna=new UTS46(options, errorCode);
202 if(idna==NULL) {
203 errorCode=U_MEMORY_ALLOCATION_ERROR;
204 } else if(U_FAILURE(errorCode)) {
205 delete idna;
206 idna=NULL;
207 }
208 return idna;
209 } else {
210 return NULL;
211 }
212 }
213
214 // UTS46 implementation ---------------------------------------------------- ***
215
216 UTS46::UTS46(uint32_t opt, UErrorCode &errorCode)
217 : uts46Norm2(*Normalizer2::getInstance(NULL, "uts46", UNORM2_COMPOSE, errorCode)),
218 options(opt) {}
219
220 UTS46::~UTS46() {}
221
222 UnicodeString &
223 UTS46::labelToASCII(const UnicodeString &label, UnicodeString &dest,
224 IDNAInfo &info, UErrorCode &errorCode) const {
225 return process(label, TRUE, TRUE, dest, info, errorCode);
226 }
227
228 UnicodeString &
229 UTS46::labelToUnicode(const UnicodeString &label, UnicodeString &dest,
230 IDNAInfo &info, UErrorCode &errorCode) const {
231 return process(label, TRUE, FALSE, dest, info, errorCode);
232 }
233
234 UnicodeString &
235 UTS46::nameToASCII(const UnicodeString &name, UnicodeString &dest,
236 IDNAInfo &info, UErrorCode &errorCode) const {
237 process(name, FALSE, TRUE, dest, info, errorCode);
238 if( dest.length()>=254 && (info.errors&UIDNA_ERROR_DOMAIN_NAME_TOO_LONG)==0 &&
239 isASCIIString(dest) &&
240 (dest.length()>254 || dest[253]!=0x2e)
241 ) {
242 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
243 }
244 return dest;
245 }
246
247 UnicodeString &
248 UTS46::nameToUnicode(const UnicodeString &name, UnicodeString &dest,
249 IDNAInfo &info, UErrorCode &errorCode) const {
250 return process(name, FALSE, FALSE, dest, info, errorCode);
251 }
252
253 void
254 UTS46::labelToASCII_UTF8(const StringPiece &label, ByteSink &dest,
255 IDNAInfo &info, UErrorCode &errorCode) const {
256 processUTF8(label, TRUE, TRUE, dest, info, errorCode);
257 }
258
259 void
260 UTS46::labelToUnicodeUTF8(const StringPiece &label, ByteSink &dest,
261 IDNAInfo &info, UErrorCode &errorCode) const {
262 processUTF8(label, TRUE, FALSE, dest, info, errorCode);
263 }
264
265 void
266 UTS46::nameToASCII_UTF8(const StringPiece &name, ByteSink &dest,
267 IDNAInfo &info, UErrorCode &errorCode) const {
268 processUTF8(name, FALSE, TRUE, dest, info, errorCode);
269 }
270
271 void
272 UTS46::nameToUnicodeUTF8(const StringPiece &name, ByteSink &dest,
273 IDNAInfo &info, UErrorCode &errorCode) const {
274 processUTF8(name, FALSE, FALSE, dest, info, errorCode);
275 }
276
277 // UTS #46 data for ASCII characters.
278 // The normalizer (using uts46.nrm) maps uppercase ASCII letters to lowercase
279 // and passes through all other ASCII characters.
280 // If UIDNA_USE_STD3_RULES is set, then non-LDH characters are disallowed
281 // using this data.
282 // The ASCII fastpath also uses this data.
283 // Values: -1=disallowed 0==valid 1==mapped (lowercase)
284 static const int8_t asciiData[128]={
285 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
286 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
287 // 002D..002E; valid # HYPHEN-MINUS..FULL STOP
288 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, -1,
289 // 0030..0039; valid # DIGIT ZERO..DIGIT NINE
290 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1,
291 // 0041..005A; mapped # LATIN CAPITAL LETTER A..LATIN CAPITAL LETTER Z
292 -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
293 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
294 // 0061..007A; valid # LATIN SMALL LETTER A..LATIN SMALL LETTER Z
295 -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
296 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1
297 };
298
299 UnicodeString &
300 UTS46::process(const UnicodeString &src,
301 UBool isLabel, UBool toASCII,
302 UnicodeString &dest,
303 IDNAInfo &info, UErrorCode &errorCode) const {
304 // uts46Norm2.normalize() would do all of this error checking and setup,
305 // but with the ASCII fastpath we do not always call it, and do not
306 // call it first.
307 if(U_FAILURE(errorCode)) {
308 dest.setToBogus();
309 return dest;
310 }
311 const UChar *srcArray=src.getBuffer();
312 if(&dest==&src || srcArray==NULL) {
313 errorCode=U_ILLEGAL_ARGUMENT_ERROR;
314 dest.setToBogus();
315 return dest;
316 }
317 // Arguments are fine, reset output values.
318 dest.remove();
319 info.reset();
320 int32_t srcLength=src.length();
321 if(srcLength==0) {
322 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
323 return dest;
324 }
325 UChar *destArray=dest.getBuffer(srcLength);
326 if(destArray==NULL) {
327 errorCode=U_MEMORY_ALLOCATION_ERROR;
328 return dest;
329 }
330 // ASCII fastpath
331 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
332 int32_t labelStart=0;
333 int32_t i;
334 for(i=0;; ++i) {
335 if(i==srcLength) {
336 if(toASCII) {
337 if((i-labelStart)>63) {
338 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
339 }
340 // There is a trailing dot if labelStart==i.
341 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
342 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
343 }
344 }
345 info.errors|=info.labelErrors;
346 dest.releaseBuffer(i);
347 return dest;
348 }
349 UChar c=srcArray[i];
350 if(c>0x7f) {
351 break;
352 }
353 int cData=asciiData[c];
354 if(cData>0) {
355 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
356 } else if(cData<0 && disallowNonLDHDot) {
357 break; // Replacing with U+FFFD can be complicated for toASCII.
358 } else {
359 destArray[i]=c;
360 if(c==0x2d) { // hyphen
361 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
362 // "??--..." is Punycode or forbidden.
363 ++i; // '-' was copied to dest already
364 break;
365 }
366 if(i==labelStart) {
367 // label starts with "-"
368 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
369 }
370 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
371 // label ends with "-"
372 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
373 }
374 } else if(c==0x2e) { // dot
375 if(isLabel) {
376 // Replacing with U+FFFD can be complicated for toASCII.
377 ++i; // '.' was copied to dest already
378 break;
379 }
380 if(i==labelStart) {
381 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
382 }
383 if(toASCII && (i-labelStart)>63) {
384 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
385 }
386 info.errors|=info.labelErrors;
387 info.labelErrors=0;
388 labelStart=i+1;
389 }
390 }
391 }
392 info.errors|=info.labelErrors;
393 dest.releaseBuffer(i);
394 processUnicode(src, labelStart, i, isLabel, toASCII, dest, info, errorCode);
395 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
396 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(dest.getBuffer(), labelStart)))
397 ) {
398 info.errors|=UIDNA_ERROR_BIDI;
399 }
400 return dest;
401 }
402
403 void
404 UTS46::processUTF8(const StringPiece &src,
405 UBool isLabel, UBool toASCII,
406 ByteSink &dest,
407 IDNAInfo &info, UErrorCode &errorCode) const {
408 if(U_FAILURE(errorCode)) {
409 return;
410 }
411 const char *srcArray=src.data();
412 int32_t srcLength=src.length();
413 if(srcArray==NULL && srcLength!=0) {
414 errorCode=U_ILLEGAL_ARGUMENT_ERROR;
415 return;
416 }
417 // Arguments are fine, reset output values.
418 info.reset();
419 if(srcLength==0) {
420 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
421 dest.Flush();
422 return;
423 }
424 UnicodeString destString;
425 int32_t labelStart=0;
426 if(srcLength<=256) { // length of stackArray[]
427 // ASCII fastpath
428 char stackArray[256];
429 int32_t destCapacity;
430 char *destArray=dest.GetAppendBuffer(srcLength, srcLength+20,
431 stackArray, UPRV_LENGTHOF(stackArray), &destCapacity);
432 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
433 int32_t i;
434 for(i=0;; ++i) {
435 if(i==srcLength) {
436 if(toASCII) {
437 if((i-labelStart)>63) {
438 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
439 }
440 // There is a trailing dot if labelStart==i.
441 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
442 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
443 }
444 }
445 info.errors|=info.labelErrors;
446 dest.Append(destArray, i);
447 dest.Flush();
448 return;
449 }
450 char c=srcArray[i];
451 if((int8_t)c<0) { // (uint8_t)c>0x7f
452 break;
453 }
454 int cData=asciiData[(int)c]; // Cast: gcc warns about indexing with a char.
455 if(cData>0) {
456 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
457 } else if(cData<0 && disallowNonLDHDot) {
458 break; // Replacing with U+FFFD can be complicated for toASCII.
459 } else {
460 destArray[i]=c;
461 if(c==0x2d) { // hyphen
462 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
463 // "??--..." is Punycode or forbidden.
464 break;
465 }
466 if(i==labelStart) {
467 // label starts with "-"
468 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
469 }
470 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
471 // label ends with "-"
472 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
473 }
474 } else if(c==0x2e) { // dot
475 if(isLabel) {
476 break; // Replacing with U+FFFD can be complicated for toASCII.
477 }
478 if(i==labelStart) {
479 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
480 }
481 if(toASCII && (i-labelStart)>63) {
482 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
483 }
484 info.errors|=info.labelErrors;
485 info.labelErrors=0;
486 labelStart=i+1;
487 }
488 }
489 }
490 info.errors|=info.labelErrors;
491 // Convert the processed ASCII prefix of the current label to UTF-16.
492 int32_t mappingStart=i-labelStart;
493 destString=UnicodeString::fromUTF8(StringPiece(destArray+labelStart, mappingStart));
494 // Output the previous ASCII labels and process the rest of src in UTF-16.
495 dest.Append(destArray, labelStart);
496 processUnicode(UnicodeString::fromUTF8(StringPiece(src, labelStart)), 0, mappingStart,
497 isLabel, toASCII,
498 destString, info, errorCode);
499 } else {
500 // src is too long for the ASCII fastpath implementation.
501 processUnicode(UnicodeString::fromUTF8(src), 0, 0,
502 isLabel, toASCII,
503 destString, info, errorCode);
504 }
505 destString.toUTF8(dest); // calls dest.Flush()
506 if(toASCII && !isLabel) {
507 // length==labelStart==254 means that there is a trailing dot (ok) and
508 // destString is empty (do not index at 253-labelStart).
509 int32_t length=labelStart+destString.length();
510 if( length>=254 && isASCIIString(destString) &&
511 (length>254 ||
512 (labelStart<254 && destString[253-labelStart]!=0x2e))
513 ) {
514 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
515 }
516 }
517 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
518 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(srcArray, labelStart)))
519 ) {
520 info.errors|=UIDNA_ERROR_BIDI;
521 }
522 }
523
524 UnicodeString &
525 UTS46::processUnicode(const UnicodeString &src,
526 int32_t labelStart, int32_t mappingStart,
527 UBool isLabel, UBool toASCII,
528 UnicodeString &dest,
529 IDNAInfo &info, UErrorCode &errorCode) const {
530 if(mappingStart==0) {
531 uts46Norm2.normalize(src, dest, errorCode);
532 } else {
533 uts46Norm2.normalizeSecondAndAppend(dest, src.tempSubString(mappingStart), errorCode);
534 }
535 if(U_FAILURE(errorCode)) {
536 return dest;
537 }
538 UBool doMapDevChars=
539 toASCII ? (options&UIDNA_NONTRANSITIONAL_TO_ASCII)==0 :
540 (options&UIDNA_NONTRANSITIONAL_TO_UNICODE)==0;
541 const UChar *destArray=dest.getBuffer();
542 int32_t destLength=dest.length();
543 int32_t labelLimit=labelStart;
544 while(labelLimit<destLength) {
545 UChar c=destArray[labelLimit];
546 if(c==0x2e && !isLabel) {
547 int32_t labelLength=labelLimit-labelStart;
548 int32_t newLength=processLabel(dest, labelStart, labelLength,
549 toASCII, info, errorCode);
550 info.errors|=info.labelErrors;
551 info.labelErrors=0;
552 if(U_FAILURE(errorCode)) {
553 return dest;
554 }
555 destArray=dest.getBuffer();
556 destLength+=newLength-labelLength;
557 labelLimit=labelStart+=newLength+1;
558 } else if(0xdf<=c && c<=0x200d && (c==0xdf || c==0x3c2 || c>=0x200c)) {
559 info.isTransDiff=TRUE;
560 if(doMapDevChars) {
561 destLength=mapDevChars(dest, labelStart, labelLimit, errorCode);
562 if(U_FAILURE(errorCode)) {
563 return dest;
564 }
565 destArray=dest.getBuffer();
566 // Do not increment labelLimit in case c was removed.
567 // All deviation characters have been mapped, no need to check for them again.
568 doMapDevChars=FALSE;
569 } else {
570 ++labelLimit;
571 }
572 } else {
573 ++labelLimit;
574 }
575 }
576 // Permit an empty label at the end (0<labelStart==labelLimit==destLength is ok)
577 // but not an empty label elsewhere nor a completely empty domain name.
578 // processLabel() sets UIDNA_ERROR_EMPTY_LABEL when labelLength==0.
579 if(0==labelStart || labelStart<labelLimit) {
580 processLabel(dest, labelStart, labelLimit-labelStart,
581 toASCII, info, errorCode);
582 info.errors|=info.labelErrors;
583 }
584 return dest;
585 }
586
587 int32_t
588 UTS46::mapDevChars(UnicodeString &dest, int32_t labelStart, int32_t mappingStart,
589 UErrorCode &errorCode) const {
590 if(U_FAILURE(errorCode)) {
591 return 0;
592 }
593 int32_t length=dest.length();
594 UChar *s=dest.getBuffer(dest[mappingStart]==0xdf ? length+1 : length);
595 if(s==NULL) {
596 errorCode=U_MEMORY_ALLOCATION_ERROR;
597 return length;
598 }
599 int32_t capacity=dest.getCapacity();
600 UBool didMapDevChars=FALSE;
601 int32_t readIndex=mappingStart, writeIndex=mappingStart;
602 do {
603 UChar c=s[readIndex++];
604 switch(c) {
605 case 0xdf:
606 // Map sharp s to ss.
607 didMapDevChars=TRUE;
608 s[writeIndex++]=0x73; // Replace sharp s with first s.
609 // Insert second s and account for possible buffer reallocation.
610 if(writeIndex==readIndex) {
611 if(length==capacity) {
612 dest.releaseBuffer(length);
613 s=dest.getBuffer(length+1);
614 if(s==NULL) {
615 errorCode=U_MEMORY_ALLOCATION_ERROR;
616 return length;
617 }
618 capacity=dest.getCapacity();
619 }
620 u_memmove(s+writeIndex+1, s+writeIndex, length-writeIndex);
621 ++readIndex;
622 }
623 s[writeIndex++]=0x73;
624 ++length;
625 break;
626 case 0x3c2: // Map final sigma to nonfinal sigma.
627 didMapDevChars=TRUE;
628 s[writeIndex++]=0x3c3;
629 break;
630 case 0x200c: // Ignore/remove ZWNJ.
631 case 0x200d: // Ignore/remove ZWJ.
632 didMapDevChars=TRUE;
633 --length;
634 break;
635 default:
636 // Only really necessary if writeIndex was different from readIndex.
637 s[writeIndex++]=c;
638 break;
639 }
640 } while(writeIndex<length);
641 dest.releaseBuffer(length);
642 if(didMapDevChars) {
643 // Mapping deviation characters might have resulted in an un-NFC string.
644 // We could use either the NFC or the UTS #46 normalizer.
645 // By using the UTS #46 normalizer again, we avoid having to load a second .nrm data file.
646 UnicodeString normalized;
647 uts46Norm2.normalize(dest.tempSubString(labelStart), normalized, errorCode);
648 if(U_SUCCESS(errorCode)) {
649 dest.replace(labelStart, 0x7fffffff, normalized);
650 if(dest.isBogus()) {
651 errorCode=U_MEMORY_ALLOCATION_ERROR;
652 }
653 return dest.length();
654 }
655 }
656 return length;
657 }
658
659 // Some non-ASCII characters are equivalent to sequences with
660 // non-LDH ASCII characters. To find them:
661 // grep disallowed_STD3_valid IdnaMappingTable.txt (or uts46.txt)
662 static inline UBool
663 isNonASCIIDisallowedSTD3Valid(UChar32 c) {
664 return c==0x2260 || c==0x226E || c==0x226F;
665 }
666
667 // Replace the label in dest with the label string, if the label was modified.
668 // If &label==&dest then the label was modified in-place and labelLength
669 // is the new label length, different from label.length().
670 // If &label!=&dest then labelLength==label.length().
671 // Returns labelLength (= the new label length).
672 static int32_t
673 replaceLabel(UnicodeString &dest, int32_t destLabelStart, int32_t destLabelLength,
674 const UnicodeString &label, int32_t labelLength, UErrorCode &errorCode) {
675 if(U_FAILURE(errorCode)) {
676 return 0;
677 }
678 if(&label!=&dest) {
679 dest.replace(destLabelStart, destLabelLength, label);
680 if(dest.isBogus()) {
681 errorCode=U_MEMORY_ALLOCATION_ERROR;
682 return 0;
683 }
684 }
685 return labelLength;
686 }
687
688 int32_t
689 UTS46::processLabel(UnicodeString &dest,
690 int32_t labelStart, int32_t labelLength,
691 UBool toASCII,
692 IDNAInfo &info, UErrorCode &errorCode) const {
693 if(U_FAILURE(errorCode)) {
694 return 0;
695 }
696 UnicodeString fromPunycode;
697 UnicodeString *labelString;
698 const UChar *label=dest.getBuffer()+labelStart;
699 int32_t destLabelStart=labelStart;
700 int32_t destLabelLength=labelLength;
701 UBool wasPunycode;
702 if(labelLength>=4 && label[0]==0x78 && label[1]==0x6e && label[2]==0x2d && label[3]==0x2d) {
703 // Label starts with "xn--", try to un-Punycode it.
704 wasPunycode=TRUE;
705 UChar *unicodeBuffer=fromPunycode.getBuffer(-1); // capacity==-1: most labels should fit
706 if(unicodeBuffer==NULL) {
707 // Should never occur if we used capacity==-1 which uses the internal buffer.
708 errorCode=U_MEMORY_ALLOCATION_ERROR;
709 return labelLength;
710 }
711 UErrorCode punycodeErrorCode=U_ZERO_ERROR;
712 int32_t unicodeLength=u_strFromPunycode(label+4, labelLength-4,
713 unicodeBuffer, fromPunycode.getCapacity(),
714 NULL, &punycodeErrorCode);
715 if(punycodeErrorCode==U_BUFFER_OVERFLOW_ERROR) {
716 fromPunycode.releaseBuffer(0);
717 unicodeBuffer=fromPunycode.getBuffer(unicodeLength);
718 if(unicodeBuffer==NULL) {
719 errorCode=U_MEMORY_ALLOCATION_ERROR;
720 return labelLength;
721 }
722 punycodeErrorCode=U_ZERO_ERROR;
723 unicodeLength=u_strFromPunycode(label+4, labelLength-4,
724 unicodeBuffer, fromPunycode.getCapacity(),
725 NULL, &punycodeErrorCode);
726 }
727 fromPunycode.releaseBuffer(unicodeLength);
728 if(U_FAILURE(punycodeErrorCode)) {
729 info.labelErrors|=UIDNA_ERROR_PUNYCODE;
730 return markBadACELabel(dest, labelStart, labelLength, toASCII, info, errorCode);
731 }
732 // Check for NFC, and for characters that are not
733 // valid or deviation characters according to the normalizer.
734 // If there is something wrong, then the string will change.
735 // Note that the normalizer passes through non-LDH ASCII and deviation characters.
736 // Deviation characters are ok in Punycode even in transitional processing.
737 // In the code further below, if we find non-LDH ASCII and we have UIDNA_USE_STD3_RULES
738 // then we will set UIDNA_ERROR_INVALID_ACE_LABEL there too.
739 UBool isValid=uts46Norm2.isNormalized(fromPunycode, errorCode);
740 if(U_FAILURE(errorCode)) {
741 return labelLength;
742 }
743 if(!isValid) {
744 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
745 return markBadACELabel(dest, labelStart, labelLength, toASCII, info, errorCode);
746 }
747 labelString=&fromPunycode;
748 label=fromPunycode.getBuffer();
749 labelStart=0;
750 labelLength=fromPunycode.length();
751 } else {
752 wasPunycode=FALSE;
753 labelString=&dest;
754 }
755 // Validity check
756 if(labelLength==0) {
757 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
758 return replaceLabel(dest, destLabelStart, destLabelLength,
759 *labelString, labelLength, errorCode);
760 }
761 // labelLength>0
762 if(labelLength>=4 && label[2]==0x2d && label[3]==0x2d) {
763 // label starts with "??--"
764 info.labelErrors|=UIDNA_ERROR_HYPHEN_3_4;
765 }
766 if(label[0]==0x2d) {
767 // label starts with "-"
768 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
769 }
770 if(label[labelLength-1]==0x2d) {
771 // label ends with "-"
772 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
773 }
774 // If the label was not a Punycode label, then it was the result of
775 // mapping, normalization and label segmentation.
776 // If the label was in Punycode, then we mapped it again above
777 // and checked its validity.
778 // Now we handle the STD3 restriction to LDH characters (if set)
779 // and we look for U+FFFD which indicates disallowed characters
780 // in a non-Punycode label or U+FFFD itself in a Punycode label.
781 // We also check for dots which can come from the input to a single-label function.
782 // Ok to cast away const because we own the UnicodeString.
783 UChar *s=(UChar *)label;
784 const UChar *limit=label+labelLength;
785 UChar oredChars=0;
786 // If we enforce STD3 rules, then ASCII characters other than LDH and dot are disallowed.
787 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
788 do {
789 UChar c=*s;
790 if(c<=0x7f) {
791 if(c==0x2e) {
792 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
793 *s=0xfffd;
794 } else if(disallowNonLDHDot && asciiData[c]<0) {
795 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
796 *s=0xfffd;
797 }
798 } else {
799 oredChars|=c;
800 if(disallowNonLDHDot && isNonASCIIDisallowedSTD3Valid(c)) {
801 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
802 *s=0xfffd;
803 } else if(c==0xfffd) {
804 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
805 }
806 }
807 ++s;
808 } while(s<limit);
809 // Check for a leading combining mark after other validity checks
810 // so that we don't report UIDNA_ERROR_DISALLOWED for the U+FFFD from here.
811 UChar32 c;
812 int32_t cpLength=0;
813 // "Unsafe" is ok because unpaired surrogates were mapped to U+FFFD.
814 U16_NEXT_UNSAFE(label, cpLength, c);
815 if((U_GET_GC_MASK(c)&U_GC_M_MASK)!=0) {
816 info.labelErrors|=UIDNA_ERROR_LEADING_COMBINING_MARK;
817 labelString->replace(labelStart, cpLength, (UChar)0xfffd);
818 label=labelString->getBuffer()+labelStart;
819 labelLength+=1-cpLength;
820 if(labelString==&dest) {
821 destLabelLength=labelLength;
822 }
823 }
824 if((info.labelErrors&severeErrors)==0) {
825 // Do contextual checks only if we do not have U+FFFD from a severe error
826 // because U+FFFD can make these checks fail.
827 if((options&UIDNA_CHECK_BIDI)!=0 && (!info.isBiDi || info.isOkBiDi)) {
828 checkLabelBiDi(label, labelLength, info);
829 }
830 if( (options&UIDNA_CHECK_CONTEXTJ)!=0 && (oredChars&0x200c)==0x200c &&
831 !isLabelOkContextJ(label, labelLength)
832 ) {
833 info.labelErrors|=UIDNA_ERROR_CONTEXTJ;
834 }
835 if((options&UIDNA_CHECK_CONTEXTO)!=0 && oredChars>=0xb7) {
836 checkLabelContextO(label, labelLength, info);
837 }
838 if(toASCII) {
839 if(wasPunycode) {
840 // Leave a Punycode label unchanged if it has no severe errors.
841 if(destLabelLength>63) {
842 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
843 }
844 return destLabelLength;
845 } else if(oredChars>=0x80) {
846 // Contains non-ASCII characters.
847 UnicodeString punycode;
848 UChar *buffer=punycode.getBuffer(63); // 63==maximum DNS label length
849 if(buffer==NULL) {
850 errorCode=U_MEMORY_ALLOCATION_ERROR;
851 return destLabelLength;
852 }
853 buffer[0]=0x78; // Write "xn--".
854 buffer[1]=0x6e;
855 buffer[2]=0x2d;
856 buffer[3]=0x2d;
857 int32_t punycodeLength=u_strToPunycode(label, labelLength,
858 buffer+4, punycode.getCapacity()-4,
859 NULL, &errorCode);
860 if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
861 errorCode=U_ZERO_ERROR;
862 punycode.releaseBuffer(4);
863 buffer=punycode.getBuffer(4+punycodeLength);
864 if(buffer==NULL) {
865 errorCode=U_MEMORY_ALLOCATION_ERROR;
866 return destLabelLength;
867 }
868 punycodeLength=u_strToPunycode(label, labelLength,
869 buffer+4, punycode.getCapacity()-4,
870 NULL, &errorCode);
871 }
872 punycodeLength+=4;
873 punycode.releaseBuffer(punycodeLength);
874 if(U_FAILURE(errorCode)) {
875 return destLabelLength;
876 }
877 if(punycodeLength>63) {
878 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
879 }
880 return replaceLabel(dest, destLabelStart, destLabelLength,
881 punycode, punycodeLength, errorCode);
882 } else {
883 // all-ASCII label
884 if(labelLength>63) {
885 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
886 }
887 }
888 }
889 } else {
890 // If a Punycode label has severe errors,
891 // then leave it but make sure it does not look valid.
892 if(wasPunycode) {
893 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
894 return markBadACELabel(dest, destLabelStart, destLabelLength, toASCII, info, errorCode);
895 }
896 }
897 return replaceLabel(dest, destLabelStart, destLabelLength,
898 *labelString, labelLength, errorCode);
899 }
900
901 // Make sure an ACE label does not look valid.
902 // Append U+FFFD if the label has only LDH characters.
903 // If UIDNA_USE_STD3_RULES, also replace disallowed ASCII characters with U+FFFD.
904 int32_t
905 UTS46::markBadACELabel(UnicodeString &dest,
906 int32_t labelStart, int32_t labelLength,
907 UBool toASCII, IDNAInfo &info, UErrorCode &errorCode) const {
908 if(U_FAILURE(errorCode)) {
909 return 0;
910 }
911 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
912 UBool isASCII=TRUE;
913 UBool onlyLDH=TRUE;
914 const UChar *label=dest.getBuffer()+labelStart;
915 // Ok to cast away const because we own the UnicodeString.
916 UChar *s=(UChar *)label+4; // After the initial "xn--".
917 const UChar *limit=label+labelLength;
918 do {
919 UChar c=*s;
920 if(c<=0x7f) {
921 if(c==0x2e) {
922 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
923 *s=0xfffd;
924 isASCII=onlyLDH=FALSE;
925 } else if(asciiData[c]<0) {
926 onlyLDH=FALSE;
927 if(disallowNonLDHDot) {
928 *s=0xfffd;
929 isASCII=FALSE;
930 }
931 }
932 } else {
933 isASCII=onlyLDH=FALSE;
934 }
935 } while(++s<limit);
936 if(onlyLDH) {
937 dest.insert(labelStart+labelLength, (UChar)0xfffd);
938 if(dest.isBogus()) {
939 errorCode=U_MEMORY_ALLOCATION_ERROR;
940 return 0;
941 }
942 ++labelLength;
943 } else {
944 if(toASCII && isASCII && labelLength>63) {
945 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
946 }
947 }
948 return labelLength;
949 }
950
951 const uint32_t L_MASK=U_MASK(U_LEFT_TO_RIGHT);
952 const uint32_t R_AL_MASK=U_MASK(U_RIGHT_TO_LEFT)|U_MASK(U_RIGHT_TO_LEFT_ARABIC);
953 const uint32_t L_R_AL_MASK=L_MASK|R_AL_MASK;
954
955 const uint32_t R_AL_AN_MASK=R_AL_MASK|U_MASK(U_ARABIC_NUMBER);
956
957 const uint32_t EN_AN_MASK=U_MASK(U_EUROPEAN_NUMBER)|U_MASK(U_ARABIC_NUMBER);
958 const uint32_t R_AL_EN_AN_MASK=R_AL_MASK|EN_AN_MASK;
959 const uint32_t L_EN_MASK=L_MASK|U_MASK(U_EUROPEAN_NUMBER);
960
961 const uint32_t ES_CS_ET_ON_BN_NSM_MASK=
962 U_MASK(U_EUROPEAN_NUMBER_SEPARATOR)|
963 U_MASK(U_COMMON_NUMBER_SEPARATOR)|
964 U_MASK(U_EUROPEAN_NUMBER_TERMINATOR)|
965 U_MASK(U_OTHER_NEUTRAL)|
966 U_MASK(U_BOUNDARY_NEUTRAL)|
967 U_MASK(U_DIR_NON_SPACING_MARK);
968 const uint32_t L_EN_ES_CS_ET_ON_BN_NSM_MASK=L_EN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
969 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;
970
971 // We scan the whole label and check both for whether it contains RTL characters
972 // and whether it passes the BiDi Rule.
973 // In a BiDi domain name, all labels must pass the BiDi Rule, but we might find
974 // that a domain name is a BiDi domain name (has an RTL label) only after
975 // processing several earlier labels.
976 void
977 UTS46::checkLabelBiDi(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
978 // IDNA2008 BiDi rule
979 // Get the directionality of the first character.
980 UChar32 c;
981 int32_t i=0;
982 U16_NEXT_UNSAFE(label, i, c);
983 uint32_t firstMask=U_MASK(u_charDirection(c));
984 // 1. The first character must be a character with BIDI property L, R
985 // or AL. If it has the R or AL property, it is an RTL label; if it
986 // has the L property, it is an LTR label.
987 if((firstMask&~L_R_AL_MASK)!=0) {
988 info.isOkBiDi=FALSE;
989 }
990 // Get the directionality of the last non-NSM character.
991 uint32_t lastMask;
992 for(;;) {
993 if(i>=labelLength) {
994 lastMask=firstMask;
995 break;
996 }
997 U16_PREV_UNSAFE(label, labelLength, c);
998 UCharDirection dir=u_charDirection(c);
999 if(dir!=U_DIR_NON_SPACING_MARK) {
1000 lastMask=U_MASK(dir);
1001 break;
1002 }
1003 }
1004 // 3. In an RTL label, the end of the label must be a character with
1005 // BIDI property R, AL, EN or AN, followed by zero or more
1006 // characters with BIDI property NSM.
1007 // 6. In an LTR label, the end of the label must be a character with
1008 // BIDI property L or EN, followed by zero or more characters with
1009 // BIDI property NSM.
1010 if( (firstMask&L_MASK)!=0 ?
1011 (lastMask&~L_EN_MASK)!=0 :
1012 (lastMask&~R_AL_EN_AN_MASK)!=0
1013 ) {
1014 info.isOkBiDi=FALSE;
1015 }
1016 // Get the directionalities of the intervening characters.
1017 uint32_t mask=0;
1018 while(i<labelLength) {
1019 U16_NEXT_UNSAFE(label, i, c);
1020 mask|=U_MASK(u_charDirection(c));
1021 }
1022 if(firstMask&L_MASK) {
1023 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1024 // ES, CS, ET, ON, BN and NSM are allowed.
1025 if((mask&~L_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1026 info.isOkBiDi=FALSE;
1027 }
1028 } else {
1029 // 2. In an RTL label, only characters with the BIDI properties R, AL,
1030 // AN, EN, ES, CS, ET, ON, BN and NSM are allowed.
1031 if((mask&~R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1032 info.isOkBiDi=FALSE;
1033 }
1034 // 4. In an RTL label, if an EN is present, no AN may be present, and
1035 // vice versa.
1036 if((mask&EN_AN_MASK)==EN_AN_MASK) {
1037 info.isOkBiDi=FALSE;
1038 }
1039 }
1040 // An RTL label is a label that contains at least one character of type
1041 // R, AL or AN. [...]
1042 // A "BIDI domain name" is a domain name that contains at least one RTL
1043 // label. [...]
1044 // The following rule, consisting of six conditions, applies to labels
1045 // in BIDI domain names.
1046 if(((firstMask|mask|lastMask)&R_AL_AN_MASK)!=0) {
1047 info.isBiDi=TRUE;
1048 }
1049 }
1050
1051 // Special code for the ASCII prefix of a BiDi domain name.
1052 // The ASCII prefix is all-LTR.
1053
1054 // IDNA2008 BiDi rule, parts relevant to ASCII labels:
1055 // 1. The first character must be a character with BIDI property L [...]
1056 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1057 // ES, CS, ET, ON, BN and NSM are allowed.
1058 // 6. In an LTR label, the end of the label must be a character with
1059 // BIDI property L or EN [...]
1060
1061 // UTF-16 version, called for mapped ASCII prefix.
1062 // Cannot contain uppercase A-Z.
1063 // s[length-1] must be the trailing dot.
1064 static UBool
1065 isASCIIOkBiDi(const UChar *s, int32_t length) {
1066 int32_t labelStart=0;
1067 for(int32_t i=0; i<length; ++i) {
1068 UChar c=s[i];
1069 if(c==0x2e) { // dot
1070 if(i>labelStart) {
1071 c=s[i-1];
1072 if(!(0x61<=c && c<=0x7a) && !(0x30<=c && c<=0x39)) {
1073 // Last character in the label is not an L or EN.
1074 return FALSE;
1075 }
1076 }
1077 labelStart=i+1;
1078 } else if(i==labelStart) {
1079 if(!(0x61<=c && c<=0x7a)) {
1080 // First character in the label is not an L.
1081 return FALSE;
1082 }
1083 } else {
1084 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1085 // Intermediate character in the label is a B, S or WS.
1086 return FALSE;
1087 }
1088 }
1089 }
1090 return TRUE;
1091 }
1092
1093 // UTF-8 version, called for source ASCII prefix.
1094 // Can contain uppercase A-Z.
1095 // s[length-1] must be the trailing dot.
1096 static UBool
1097 isASCIIOkBiDi(const char *s, int32_t length) {
1098 int32_t labelStart=0;
1099 for(int32_t i=0; i<length; ++i) {
1100 char c=s[i];
1101 if(c==0x2e) { // dot
1102 if(i>labelStart) {
1103 c=s[i-1];
1104 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a) && !(0x30<=c && c<=0x39)) {
1105 // Last character in the label is not an L or EN.
1106 return FALSE;
1107 }
1108 }
1109 labelStart=i+1;
1110 } else if(i==labelStart) {
1111 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a)) {
1112 // First character in the label is not an L.
1113 return FALSE;
1114 }
1115 } else {
1116 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1117 // Intermediate character in the label is a B, S or WS.
1118 return FALSE;
1119 }
1120 }
1121 }
1122 return TRUE;
1123 }
1124
1125 UBool
1126 UTS46::isLabelOkContextJ(const UChar *label, int32_t labelLength) const {
1127 const UBiDiProps *bdp=ubidi_getSingleton();
1128 // [IDNA2008-Tables]
1129 // 200C..200D ; CONTEXTJ # ZERO WIDTH NON-JOINER..ZERO WIDTH JOINER
1130 for(int32_t i=0; i<labelLength; ++i) {
1131 if(label[i]==0x200c) {
1132 // Appendix A.1. ZERO WIDTH NON-JOINER
1133 // Rule Set:
1134 // False;
1135 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1136 // If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C
1137 // (Joining_Type:T)*(Joining_Type:{R,D})) Then True;
1138 if(i==0) {
1139 return FALSE;
1140 }
1141 UChar32 c;
1142 int32_t j=i;
1143 U16_PREV_UNSAFE(label, j, c);
1144 if(uts46Norm2.getCombiningClass(c)==9) {
1145 continue;
1146 }
1147 // check precontext (Joining_Type:{L,D})(Joining_Type:T)*
1148 for(;;) {
1149 UJoiningType type=ubidi_getJoiningType(bdp, c);
1150 if(type==U_JT_TRANSPARENT) {
1151 if(j==0) {
1152 return FALSE;
1153 }
1154 U16_PREV_UNSAFE(label, j, c);
1155 } else if(type==U_JT_LEFT_JOINING || type==U_JT_DUAL_JOINING) {
1156 break; // precontext fulfilled
1157 } else {
1158 return FALSE;
1159 }
1160 }
1161 // check postcontext (Joining_Type:T)*(Joining_Type:{R,D})
1162 for(j=i+1;;) {
1163 if(j==labelLength) {
1164 return FALSE;
1165 }
1166 U16_NEXT_UNSAFE(label, j, c);
1167 UJoiningType type=ubidi_getJoiningType(bdp, c);
1168 if(type==U_JT_TRANSPARENT) {
1169 // just skip this character
1170 } else if(type==U_JT_RIGHT_JOINING || type==U_JT_DUAL_JOINING) {
1171 break; // postcontext fulfilled
1172 } else {
1173 return FALSE;
1174 }
1175 }
1176 } else if(label[i]==0x200d) {
1177 // Appendix A.2. ZERO WIDTH JOINER (U+200D)
1178 // Rule Set:
1179 // False;
1180 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1181 if(i==0) {
1182 return FALSE;
1183 }
1184 UChar32 c;
1185 int32_t j=i;
1186 U16_PREV_UNSAFE(label, j, c);
1187 if(uts46Norm2.getCombiningClass(c)!=9) {
1188 return FALSE;
1189 }
1190 }
1191 }
1192 return TRUE;
1193 }
1194
1195 void
1196 UTS46::checkLabelContextO(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
1197 int32_t labelEnd=labelLength-1; // inclusive
1198 int32_t arabicDigits=0; // -1 for 066x, +1 for 06Fx
1199 for(int32_t i=0; i<=labelEnd; ++i) {
1200 UChar32 c=label[i];
1201 if(c<0xb7) {
1202 // ASCII fastpath
1203 } else if(c<=0x6f9) {
1204 if(c==0xb7) {
1205 // Appendix A.3. MIDDLE DOT (U+00B7)
1206 // Rule Set:
1207 // False;
1208 // If Before(cp) .eq. U+006C And
1209 // After(cp) .eq. U+006C Then True;
1210 if(!(0<i && label[i-1]==0x6c &&
1211 i<labelEnd && label[i+1]==0x6c)) {
1212 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1213 }
1214 } else if(c==0x375) {
1215 // Appendix A.4. GREEK LOWER NUMERAL SIGN (KERAIA) (U+0375)
1216 // Rule Set:
1217 // False;
1218 // If Script(After(cp)) .eq. Greek Then True;
1219 UScriptCode script=USCRIPT_INVALID_CODE;
1220 if(i<labelEnd) {
1221 UErrorCode errorCode=U_ZERO_ERROR;
1222 int32_t j=i+1;
1223 U16_NEXT(label, j, labelLength, c);
1224 script=uscript_getScript(c, &errorCode);
1225 }
1226 if(script!=USCRIPT_GREEK) {
1227 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1228 }
1229 } else if(c==0x5f3 || c==0x5f4) {
1230 // Appendix A.5. HEBREW PUNCTUATION GERESH (U+05F3)
1231 // Rule Set:
1232 // False;
1233 // If Script(Before(cp)) .eq. Hebrew Then True;
1234 //
1235 // Appendix A.6. HEBREW PUNCTUATION GERSHAYIM (U+05F4)
1236 // Rule Set:
1237 // False;
1238 // If Script(Before(cp)) .eq. Hebrew Then True;
1239 UScriptCode script=USCRIPT_INVALID_CODE;
1240 if(0<i) {
1241 UErrorCode errorCode=U_ZERO_ERROR;
1242 int32_t j=i;
1243 U16_PREV(label, 0, j, c);
1244 script=uscript_getScript(c, &errorCode);
1245 }
1246 if(script!=USCRIPT_HEBREW) {
1247 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1248 }
1249 } else if(0x660<=c /* && c<=0x6f9 */) {
1250 // Appendix A.8. ARABIC-INDIC DIGITS (0660..0669)
1251 // Rule Set:
1252 // True;
1253 // For All Characters:
1254 // If cp .in. 06F0..06F9 Then False;
1255 // End For;
1256 //
1257 // Appendix A.9. EXTENDED ARABIC-INDIC DIGITS (06F0..06F9)
1258 // Rule Set:
1259 // True;
1260 // For All Characters:
1261 // If cp .in. 0660..0669 Then False;
1262 // End For;
1263 if(c<=0x669) {
1264 if(arabicDigits>0) {
1265 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1266 }
1267 arabicDigits=-1;
1268 } else if(0x6f0<=c) {
1269 if(arabicDigits<0) {
1270 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1271 }
1272 arabicDigits=1;
1273 }
1274 }
1275 } else if(c==0x30fb) {
1276 // Appendix A.7. KATAKANA MIDDLE DOT (U+30FB)
1277 // Rule Set:
1278 // False;
1279 // For All Characters:
1280 // If Script(cp) .in. {Hiragana, Katakana, Han} Then True;
1281 // End For;
1282 UErrorCode errorCode=U_ZERO_ERROR;
1283 for(int j=0;;) {
1284 if(j>labelEnd) {
1285 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1286 break;
1287 }
1288 U16_NEXT(label, j, labelLength, c);
1289 UScriptCode script=uscript_getScript(c, &errorCode);
1290 if(script==USCRIPT_HIRAGANA || script==USCRIPT_KATAKANA || script==USCRIPT_HAN) {
1291 break;
1292 }
1293 }
1294 }
1295 }
1296 }
1297
1298 U_NAMESPACE_END
1299
1300 // C API ------------------------------------------------------------------- ***
1301
1302 U_NAMESPACE_USE
1303
1304 U_CAPI UIDNA * U_EXPORT2
1305 uidna_openUTS46(uint32_t options, UErrorCode *pErrorCode) {
1306 return reinterpret_cast<UIDNA *>(IDNA::createUTS46Instance(options, *pErrorCode));
1307 }
1308
1309 U_CAPI void U_EXPORT2
1310 uidna_close(UIDNA *idna) {
1311 delete reinterpret_cast<IDNA *>(idna);
1312 }
1313
1314 static UBool
1315 checkArgs(const void *label, int32_t length,
1316 void *dest, int32_t capacity,
1317 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1318 if(U_FAILURE(*pErrorCode)) {
1319 return FALSE;
1320 }
1321 // sizeof(UIDNAInfo)=16 in the first API version.
1322 if(pInfo==NULL || pInfo->size<16) {
1323 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1324 return FALSE;
1325 }
1326 if( (label==NULL ? length!=0 : length<-1) ||
1327 (dest==NULL ? capacity!=0 : capacity<0) ||
1328 (dest==label && label!=NULL)
1329 ) {
1330 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1331 return FALSE;
1332 }
1333 // Set all *pInfo bytes to 0 except for the size field itself.
1334 uprv_memset(&pInfo->size+1, 0, pInfo->size-sizeof(pInfo->size));
1335 return TRUE;
1336 }
1337
1338 static void
1339 idnaInfoToStruct(IDNAInfo &info, UIDNAInfo *pInfo) {
1340 pInfo->isTransitionalDifferent=info.isTransitionalDifferent();
1341 pInfo->errors=info.getErrors();
1342 }
1343
1344 U_CAPI int32_t U_EXPORT2
1345 uidna_labelToASCII(const UIDNA *idna,
1346 const UChar *label, int32_t length,
1347 UChar *dest, int32_t capacity,
1348 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1349 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1350 return 0;
1351 }
1352 UnicodeString src((UBool)(length<0), label, length);
1353 UnicodeString destString(dest, 0, capacity);
1354 IDNAInfo info;
1355 reinterpret_cast<const IDNA *>(idna)->labelToASCII(src, destString, info, *pErrorCode);
1356 idnaInfoToStruct(info, pInfo);
1357 return destString.extract(dest, capacity, *pErrorCode);
1358 }
1359
1360 U_CAPI int32_t U_EXPORT2
1361 uidna_labelToUnicode(const UIDNA *idna,
1362 const UChar *label, int32_t length,
1363 UChar *dest, int32_t capacity,
1364 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1365 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1366 return 0;
1367 }
1368 UnicodeString src((UBool)(length<0), label, length);
1369 UnicodeString destString(dest, 0, capacity);
1370 IDNAInfo info;
1371 reinterpret_cast<const IDNA *>(idna)->labelToUnicode(src, destString, info, *pErrorCode);
1372 idnaInfoToStruct(info, pInfo);
1373 return destString.extract(dest, capacity, *pErrorCode);
1374 }
1375
1376 U_CAPI int32_t U_EXPORT2
1377 uidna_nameToASCII(const UIDNA *idna,
1378 const UChar *name, int32_t length,
1379 UChar *dest, int32_t capacity,
1380 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1381 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1382 return 0;
1383 }
1384 UnicodeString src((UBool)(length<0), name, length);
1385 UnicodeString destString(dest, 0, capacity);
1386 IDNAInfo info;
1387 reinterpret_cast<const IDNA *>(idna)->nameToASCII(src, destString, info, *pErrorCode);
1388 idnaInfoToStruct(info, pInfo);
1389 return destString.extract(dest, capacity, *pErrorCode);
1390 }
1391
1392 U_CAPI int32_t U_EXPORT2
1393 uidna_nameToUnicode(const UIDNA *idna,
1394 const UChar *name, int32_t length,
1395 UChar *dest, int32_t capacity,
1396 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1397 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1398 return 0;
1399 }
1400 UnicodeString src((UBool)(length<0), name, length);
1401 UnicodeString destString(dest, 0, capacity);
1402 IDNAInfo info;
1403 reinterpret_cast<const IDNA *>(idna)->nameToUnicode(src, destString, info, *pErrorCode);
1404 idnaInfoToStruct(info, pInfo);
1405 return destString.extract(dest, capacity, *pErrorCode);
1406 }
1407
1408 U_CAPI int32_t U_EXPORT2
1409 uidna_labelToASCII_UTF8(const UIDNA *idna,
1410 const char *label, int32_t length,
1411 char *dest, int32_t capacity,
1412 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1413 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1414 return 0;
1415 }
1416 StringPiece src(label, length<0 ? uprv_strlen(label) : length);
1417 CheckedArrayByteSink sink(dest, capacity);
1418 IDNAInfo info;
1419 reinterpret_cast<const IDNA *>(idna)->labelToASCII_UTF8(src, sink, info, *pErrorCode);
1420 idnaInfoToStruct(info, pInfo);
1421 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1422 }
1423
1424 U_CAPI int32_t U_EXPORT2
1425 uidna_labelToUnicodeUTF8(const UIDNA *idna,
1426 const char *label, int32_t length,
1427 char *dest, int32_t capacity,
1428 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1429 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1430 return 0;
1431 }
1432 StringPiece src(label, length<0 ? uprv_strlen(label) : length);
1433 CheckedArrayByteSink sink(dest, capacity);
1434 IDNAInfo info;
1435 reinterpret_cast<const IDNA *>(idna)->labelToUnicodeUTF8(src, sink, info, *pErrorCode);
1436 idnaInfoToStruct(info, pInfo);
1437 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1438 }
1439
1440 U_CAPI int32_t U_EXPORT2
1441 uidna_nameToASCII_UTF8(const UIDNA *idna,
1442 const char *name, int32_t length,
1443 char *dest, int32_t capacity,
1444 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1445 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1446 return 0;
1447 }
1448 StringPiece src(name, length<0 ? uprv_strlen(name) : length);
1449 CheckedArrayByteSink sink(dest, capacity);
1450 IDNAInfo info;
1451 reinterpret_cast<const IDNA *>(idna)->nameToASCII_UTF8(src, sink, info, *pErrorCode);
1452 idnaInfoToStruct(info, pInfo);
1453 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1454 }
1455
1456 U_CAPI int32_t U_EXPORT2
1457 uidna_nameToUnicodeUTF8(const UIDNA *idna,
1458 const char *name, int32_t length,
1459 char *dest, int32_t capacity,
1460 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1461 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1462 return 0;
1463 }
1464 StringPiece src(name, length<0 ? uprv_strlen(name) : length);
1465 CheckedArrayByteSink sink(dest, capacity);
1466 IDNAInfo info;
1467 reinterpret_cast<const IDNA *>(idna)->nameToUnicodeUTF8(src, sink, info, *pErrorCode);
1468 idnaInfoToStruct(info, pInfo);
1469 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1470 }
1471
1472 #endif // UCONFIG_NO_IDNA
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