1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2010-2015, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 * file name: uts46.cpp
9 * encoding: UTF-8
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2010mar09
14 * created by: Markus W. Scherer
15 */
16
17 #include "unicode/utypes.h"
18
19 #if !UCONFIG_NO_IDNA
20
21 #include "unicode/idna.h"
22 #include "unicode/normalizer2.h"
23 #include "unicode/uscript.h"
24 #include "unicode/ustring.h"
25 #include "unicode/utf16.h"
26 #include "cmemory.h"
27 #include "cstring.h"
28 #include "punycode.h"
29 #include "ubidi_props.h"
30 #include "ustr_imp.h"
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
isASCIIString(const UnicodeString & dest)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
~IDNA()70 IDNA::~IDNA() {}
71
72 void
labelToASCII_UTF8(StringPiece label,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const73 IDNA::labelToASCII_UTF8(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
labelToUnicodeUTF8(StringPiece label,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const83 IDNA::labelToUnicodeUTF8(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
nameToASCII_UTF8(StringPiece name,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const93 IDNA::nameToASCII_UTF8(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
nameToUnicodeUTF8(StringPiece name,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const103 IDNA::nameToUnicodeUTF8(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(StringPiece label, ByteSink &dest,
137 IDNAInfo &info, UErrorCode &errorCode) const;
138
139 virtual void
140 labelToUnicodeUTF8(StringPiece label, ByteSink &dest,
141 IDNAInfo &info, UErrorCode &errorCode) const;
142
143 virtual void
144 nameToASCII_UTF8(StringPiece name, ByteSink &dest,
145 IDNAInfo &info, UErrorCode &errorCode) const;
146
147 virtual void
148 nameToUnicodeUTF8(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(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, UErrorCode &errorCode) 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 *
createUTS46Instance(uint32_t options,UErrorCode & errorCode)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
UTS46(uint32_t opt,UErrorCode & errorCode)218 UTS46::UTS46(uint32_t opt, UErrorCode &errorCode)
219 : uts46Norm2(*Normalizer2::getInstance(NULL, "uts46", UNORM2_COMPOSE, errorCode)),
220 options(opt) {}
221
~UTS46()222 UTS46::~UTS46() {}
223
224 UnicodeString &
labelToASCII(const UnicodeString & label,UnicodeString & dest,IDNAInfo & info,UErrorCode & errorCode) const225 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 &
labelToUnicode(const UnicodeString & label,UnicodeString & dest,IDNAInfo & info,UErrorCode & errorCode) const231 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 &
nameToASCII(const UnicodeString & name,UnicodeString & dest,IDNAInfo & info,UErrorCode & errorCode) const237 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 &
nameToUnicode(const UnicodeString & name,UnicodeString & dest,IDNAInfo & info,UErrorCode & errorCode) const250 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
labelToASCII_UTF8(StringPiece label,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const256 UTS46::labelToASCII_UTF8(StringPiece label, ByteSink &dest,
257 IDNAInfo &info, UErrorCode &errorCode) const {
258 processUTF8(label, TRUE, TRUE, dest, info, errorCode);
259 }
260
261 void
labelToUnicodeUTF8(StringPiece label,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const262 UTS46::labelToUnicodeUTF8(StringPiece label, ByteSink &dest,
263 IDNAInfo &info, UErrorCode &errorCode) const {
264 processUTF8(label, TRUE, FALSE, dest, info, errorCode);
265 }
266
267 void
nameToASCII_UTF8(StringPiece name,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const268 UTS46::nameToASCII_UTF8(StringPiece name, ByteSink &dest,
269 IDNAInfo &info, UErrorCode &errorCode) const {
270 processUTF8(name, FALSE, TRUE, dest, info, errorCode);
271 }
272
273 void
nameToUnicodeUTF8(StringPiece name,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const274 UTS46::nameToUnicodeUTF8(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 &
process(const UnicodeString & src,UBool isLabel,UBool toASCII,UnicodeString & dest,IDNAInfo & info,UErrorCode & errorCode) const302 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 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
325 return dest;
326 }
327 UChar *destArray=dest.getBuffer(srcLength);
328 if(destArray==NULL) {
329 errorCode=U_MEMORY_ALLOCATION_ERROR;
330 return dest;
331 }
332 // ASCII fastpath
333 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
334 int32_t labelStart=0;
335 int32_t i;
336 for(i=0;; ++i) {
337 if(i==srcLength) {
338 if(toASCII) {
339 if((i-labelStart)>63) {
340 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
341 }
342 // There is a trailing dot if labelStart==i.
343 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
344 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
345 }
346 }
347 info.errors|=info.labelErrors;
348 dest.releaseBuffer(i);
349 return dest;
350 }
351 UChar c=srcArray[i];
352 if(c>0x7f) {
353 break;
354 }
355 int cData=asciiData[c];
356 if(cData>0) {
357 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
358 } else if(cData<0 && disallowNonLDHDot) {
359 break; // Replacing with U+FFFD can be complicated for toASCII.
360 } else {
361 destArray[i]=c;
362 if(c==0x2d) { // hyphen
363 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
364 // "??--..." is Punycode or forbidden.
365 ++i; // '-' was copied to dest already
366 break;
367 }
368 if(i==labelStart) {
369 // label starts with "-"
370 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
371 }
372 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
373 // label ends with "-"
374 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
375 }
376 } else if(c==0x2e) { // dot
377 if(isLabel) {
378 // Replacing with U+FFFD can be complicated for toASCII.
379 ++i; // '.' was copied to dest already
380 break;
381 }
382 if(i==labelStart) {
383 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
384 }
385 if(toASCII && (i-labelStart)>63) {
386 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
387 }
388 info.errors|=info.labelErrors;
389 info.labelErrors=0;
390 labelStart=i+1;
391 }
392 }
393 }
394 info.errors|=info.labelErrors;
395 dest.releaseBuffer(i);
396 processUnicode(src, labelStart, i, isLabel, toASCII, dest, info, errorCode);
397 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
398 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(dest.getBuffer(), labelStart)))
399 ) {
400 info.errors|=UIDNA_ERROR_BIDI;
401 }
402 return dest;
403 }
404
405 void
processUTF8(StringPiece src,UBool isLabel,UBool toASCII,ByteSink & dest,IDNAInfo & info,UErrorCode & errorCode) const406 UTS46::processUTF8(StringPiece src,
407 UBool isLabel, UBool toASCII,
408 ByteSink &dest,
409 IDNAInfo &info, UErrorCode &errorCode) const {
410 if(U_FAILURE(errorCode)) {
411 return;
412 }
413 const char *srcArray=src.data();
414 int32_t srcLength=src.length();
415 if(srcArray==NULL && srcLength!=0) {
416 errorCode=U_ILLEGAL_ARGUMENT_ERROR;
417 return;
418 }
419 // Arguments are fine, reset output values.
420 info.reset();
421 if(srcLength==0) {
422 info.errors|=UIDNA_ERROR_EMPTY_LABEL;
423 dest.Flush();
424 return;
425 }
426 UnicodeString destString;
427 int32_t labelStart=0;
428 if(srcLength<=256) { // length of stackArray[]
429 // ASCII fastpath
430 char stackArray[256];
431 int32_t destCapacity;
432 char *destArray=dest.GetAppendBuffer(srcLength, srcLength+20,
433 stackArray, UPRV_LENGTHOF(stackArray), &destCapacity);
434 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
435 int32_t i;
436 for(i=0;; ++i) {
437 if(i==srcLength) {
438 if(toASCII) {
439 if((i-labelStart)>63) {
440 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
441 }
442 // There is a trailing dot if labelStart==i.
443 if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
444 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
445 }
446 }
447 info.errors|=info.labelErrors;
448 dest.Append(destArray, i);
449 dest.Flush();
450 return;
451 }
452 char c=srcArray[i];
453 if((int8_t)c<0) { // (uint8_t)c>0x7f
454 break;
455 }
456 int cData=asciiData[(int)c]; // Cast: gcc warns about indexing with a char.
457 if(cData>0) {
458 destArray[i]=c+0x20; // Lowercase an uppercase ASCII letter.
459 } else if(cData<0 && disallowNonLDHDot) {
460 break; // Replacing with U+FFFD can be complicated for toASCII.
461 } else {
462 destArray[i]=c;
463 if(c==0x2d) { // hyphen
464 if(i==(labelStart+3) && srcArray[i-1]==0x2d) {
465 // "??--..." is Punycode or forbidden.
466 break;
467 }
468 if(i==labelStart) {
469 // label starts with "-"
470 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
471 }
472 if((i+1)==srcLength || srcArray[i+1]==0x2e) {
473 // label ends with "-"
474 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
475 }
476 } else if(c==0x2e) { // dot
477 if(isLabel) {
478 break; // Replacing with U+FFFD can be complicated for toASCII.
479 }
480 if(i==labelStart) {
481 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
482 }
483 if(toASCII && (i-labelStart)>63) {
484 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
485 }
486 info.errors|=info.labelErrors;
487 info.labelErrors=0;
488 labelStart=i+1;
489 }
490 }
491 }
492 info.errors|=info.labelErrors;
493 // Convert the processed ASCII prefix of the current label to UTF-16.
494 int32_t mappingStart=i-labelStart;
495 destString=UnicodeString::fromUTF8(StringPiece(destArray+labelStart, mappingStart));
496 // Output the previous ASCII labels and process the rest of src in UTF-16.
497 dest.Append(destArray, labelStart);
498 processUnicode(UnicodeString::fromUTF8(StringPiece(src, labelStart)), 0, mappingStart,
499 isLabel, toASCII,
500 destString, info, errorCode);
501 } else {
502 // src is too long for the ASCII fastpath implementation.
503 processUnicode(UnicodeString::fromUTF8(src), 0, 0,
504 isLabel, toASCII,
505 destString, info, errorCode);
506 }
507 destString.toUTF8(dest); // calls dest.Flush()
508 if(toASCII && !isLabel) {
509 // length==labelStart==254 means that there is a trailing dot (ok) and
510 // destString is empty (do not index at 253-labelStart).
511 int32_t length=labelStart+destString.length();
512 if( length>=254 && isASCIIString(destString) &&
513 (length>254 ||
514 (labelStart<254 && destString[253-labelStart]!=0x2e))
515 ) {
516 info.errors|=UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
517 }
518 }
519 if( info.isBiDi && U_SUCCESS(errorCode) && (info.errors&severeErrors)==0 &&
520 (!info.isOkBiDi || (labelStart>0 && !isASCIIOkBiDi(srcArray, labelStart)))
521 ) {
522 info.errors|=UIDNA_ERROR_BIDI;
523 }
524 }
525
526 UnicodeString &
processUnicode(const UnicodeString & src,int32_t labelStart,int32_t mappingStart,UBool isLabel,UBool toASCII,UnicodeString & dest,IDNAInfo & info,UErrorCode & errorCode) const527 UTS46::processUnicode(const UnicodeString &src,
528 int32_t labelStart, int32_t mappingStart,
529 UBool isLabel, UBool toASCII,
530 UnicodeString &dest,
531 IDNAInfo &info, UErrorCode &errorCode) const {
532 if(mappingStart==0) {
533 uts46Norm2.normalize(src, dest, errorCode);
534 } else {
535 uts46Norm2.normalizeSecondAndAppend(dest, src.tempSubString(mappingStart), errorCode);
536 }
537 if(U_FAILURE(errorCode)) {
538 return dest;
539 }
540 UBool doMapDevChars=
541 toASCII ? (options&UIDNA_NONTRANSITIONAL_TO_ASCII)==0 :
542 (options&UIDNA_NONTRANSITIONAL_TO_UNICODE)==0;
543 const UChar *destArray=dest.getBuffer();
544 int32_t destLength=dest.length();
545 int32_t labelLimit=labelStart;
546 while(labelLimit<destLength) {
547 UChar c=destArray[labelLimit];
548 if(c==0x2e && !isLabel) {
549 int32_t labelLength=labelLimit-labelStart;
550 int32_t newLength=processLabel(dest, labelStart, labelLength,
551 toASCII, info, errorCode);
552 info.errors|=info.labelErrors;
553 info.labelErrors=0;
554 if(U_FAILURE(errorCode)) {
555 return dest;
556 }
557 destArray=dest.getBuffer();
558 destLength+=newLength-labelLength;
559 labelLimit=labelStart+=newLength+1;
560 continue;
561 } else if(c<0xdf) {
562 // pass
563 } else if(c<=0x200d && (c==0xdf || c==0x3c2 || c>=0x200c)) {
564 info.isTransDiff=TRUE;
565 if(doMapDevChars) {
566 destLength=mapDevChars(dest, labelStart, labelLimit, errorCode);
567 if(U_FAILURE(errorCode)) {
568 return dest;
569 }
570 destArray=dest.getBuffer();
571 // All deviation characters have been mapped, no need to check for them again.
572 doMapDevChars=FALSE;
573 // Do not increment labelLimit in case c was removed.
574 continue;
575 }
576 } else if(U16_IS_SURROGATE(c)) {
577 if(U16_IS_SURROGATE_LEAD(c) ?
578 (labelLimit+1)==destLength || !U16_IS_TRAIL(destArray[labelLimit+1]) :
579 labelLimit==labelStart || !U16_IS_LEAD(destArray[labelLimit-1])) {
580 // Map an unpaired surrogate to U+FFFD before normalization so that when
581 // that removes characters we do not turn two unpaired ones into a pair.
582 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
583 dest.setCharAt(labelLimit, 0xfffd);
584 destArray=dest.getBuffer();
585 }
586 }
587 ++labelLimit;
588 }
589 // Permit an empty label at the end (0<labelStart==labelLimit==destLength is ok)
590 // but not an empty label elsewhere nor a completely empty domain name.
591 // processLabel() sets UIDNA_ERROR_EMPTY_LABEL when labelLength==0.
592 if(0==labelStart || labelStart<labelLimit) {
593 processLabel(dest, labelStart, labelLimit-labelStart,
594 toASCII, info, errorCode);
595 info.errors|=info.labelErrors;
596 }
597 return dest;
598 }
599
600 int32_t
mapDevChars(UnicodeString & dest,int32_t labelStart,int32_t mappingStart,UErrorCode & errorCode) const601 UTS46::mapDevChars(UnicodeString &dest, int32_t labelStart, int32_t mappingStart,
602 UErrorCode &errorCode) const {
603 if(U_FAILURE(errorCode)) {
604 return 0;
605 }
606 int32_t length=dest.length();
607 UChar *s=dest.getBuffer(dest[mappingStart]==0xdf ? length+1 : length);
608 if(s==NULL) {
609 errorCode=U_MEMORY_ALLOCATION_ERROR;
610 return length;
611 }
612 int32_t capacity=dest.getCapacity();
613 UBool didMapDevChars=FALSE;
614 int32_t readIndex=mappingStart, writeIndex=mappingStart;
615 do {
616 UChar c=s[readIndex++];
617 switch(c) {
618 case 0xdf:
619 // Map sharp s to ss.
620 didMapDevChars=TRUE;
621 s[writeIndex++]=0x73; // Replace sharp s with first s.
622 // Insert second s and account for possible buffer reallocation.
623 if(writeIndex==readIndex) {
624 if(length==capacity) {
625 dest.releaseBuffer(length);
626 s=dest.getBuffer(length+1);
627 if(s==NULL) {
628 errorCode=U_MEMORY_ALLOCATION_ERROR;
629 return length;
630 }
631 capacity=dest.getCapacity();
632 }
633 u_memmove(s+writeIndex+1, s+writeIndex, length-writeIndex);
634 ++readIndex;
635 }
636 s[writeIndex++]=0x73;
637 ++length;
638 break;
639 case 0x3c2: // Map final sigma to nonfinal sigma.
640 didMapDevChars=TRUE;
641 s[writeIndex++]=0x3c3;
642 break;
643 case 0x200c: // Ignore/remove ZWNJ.
644 case 0x200d: // Ignore/remove ZWJ.
645 didMapDevChars=TRUE;
646 --length;
647 break;
648 default:
649 // Only really necessary if writeIndex was different from readIndex.
650 s[writeIndex++]=c;
651 break;
652 }
653 } while(writeIndex<length);
654 dest.releaseBuffer(length);
655 if(didMapDevChars) {
656 // Mapping deviation characters might have resulted in an un-NFC string.
657 // We could use either the NFC or the UTS #46 normalizer.
658 // By using the UTS #46 normalizer again, we avoid having to load a second .nrm data file.
659 UnicodeString normalized;
660 uts46Norm2.normalize(dest.tempSubString(labelStart), normalized, errorCode);
661 if(U_SUCCESS(errorCode)) {
662 dest.replace(labelStart, 0x7fffffff, normalized);
663 if(dest.isBogus()) {
664 errorCode=U_MEMORY_ALLOCATION_ERROR;
665 }
666 return dest.length();
667 }
668 }
669 return length;
670 }
671
672 // Some non-ASCII characters are equivalent to sequences with
673 // non-LDH ASCII characters. To find them:
674 // grep disallowed_STD3_valid IdnaMappingTable.txt (or uts46.txt)
675 static inline UBool
isNonASCIIDisallowedSTD3Valid(UChar32 c)676 isNonASCIIDisallowedSTD3Valid(UChar32 c) {
677 return c==0x2260 || c==0x226E || c==0x226F;
678 }
679
680 // Replace the label in dest with the label string, if the label was modified.
681 // If &label==&dest then the label was modified in-place and labelLength
682 // is the new label length, different from label.length().
683 // If &label!=&dest then labelLength==label.length().
684 // Returns labelLength (= the new label length).
685 static int32_t
replaceLabel(UnicodeString & dest,int32_t destLabelStart,int32_t destLabelLength,const UnicodeString & label,int32_t labelLength,UErrorCode & errorCode)686 replaceLabel(UnicodeString &dest, int32_t destLabelStart, int32_t destLabelLength,
687 const UnicodeString &label, int32_t labelLength, UErrorCode &errorCode) {
688 if(U_FAILURE(errorCode)) {
689 return 0;
690 }
691 if(&label!=&dest) {
692 dest.replace(destLabelStart, destLabelLength, label);
693 if(dest.isBogus()) {
694 errorCode=U_MEMORY_ALLOCATION_ERROR;
695 return 0;
696 }
697 }
698 return labelLength;
699 }
700
701 int32_t
processLabel(UnicodeString & dest,int32_t labelStart,int32_t labelLength,UBool toASCII,IDNAInfo & info,UErrorCode & errorCode) const702 UTS46::processLabel(UnicodeString &dest,
703 int32_t labelStart, int32_t labelLength,
704 UBool toASCII,
705 IDNAInfo &info, UErrorCode &errorCode) const {
706 if(U_FAILURE(errorCode)) {
707 return 0;
708 }
709 UnicodeString fromPunycode;
710 UnicodeString *labelString;
711 const UChar *label=dest.getBuffer()+labelStart;
712 int32_t destLabelStart=labelStart;
713 int32_t destLabelLength=labelLength;
714 UBool wasPunycode;
715 if(labelLength>=4 && label[0]==0x78 && label[1]==0x6e && label[2]==0x2d && label[3]==0x2d) {
716 // Label starts with "xn--", try to un-Punycode it.
717 wasPunycode=TRUE;
718 UChar *unicodeBuffer=fromPunycode.getBuffer(-1); // capacity==-1: most labels should fit
719 if(unicodeBuffer==NULL) {
720 // Should never occur if we used capacity==-1 which uses the internal buffer.
721 errorCode=U_MEMORY_ALLOCATION_ERROR;
722 return labelLength;
723 }
724 UErrorCode punycodeErrorCode=U_ZERO_ERROR;
725 int32_t unicodeLength=u_strFromPunycode(label+4, labelLength-4,
726 unicodeBuffer, fromPunycode.getCapacity(),
727 NULL, &punycodeErrorCode);
728 if(punycodeErrorCode==U_BUFFER_OVERFLOW_ERROR) {
729 fromPunycode.releaseBuffer(0);
730 unicodeBuffer=fromPunycode.getBuffer(unicodeLength);
731 if(unicodeBuffer==NULL) {
732 errorCode=U_MEMORY_ALLOCATION_ERROR;
733 return labelLength;
734 }
735 punycodeErrorCode=U_ZERO_ERROR;
736 unicodeLength=u_strFromPunycode(label+4, labelLength-4,
737 unicodeBuffer, fromPunycode.getCapacity(),
738 NULL, &punycodeErrorCode);
739 }
740 fromPunycode.releaseBuffer(unicodeLength);
741 if(U_FAILURE(punycodeErrorCode)) {
742 info.labelErrors|=UIDNA_ERROR_PUNYCODE;
743 return markBadACELabel(dest, labelStart, labelLength, toASCII, info, errorCode);
744 }
745 // Check for NFC, and for characters that are not
746 // valid or deviation characters according to the normalizer.
747 // If there is something wrong, then the string will change.
748 // Note that the normalizer passes through non-LDH ASCII and deviation characters.
749 // Deviation characters are ok in Punycode even in transitional processing.
750 // In the code further below, if we find non-LDH ASCII and we have UIDNA_USE_STD3_RULES
751 // then we will set UIDNA_ERROR_INVALID_ACE_LABEL there too.
752 UBool isValid=uts46Norm2.isNormalized(fromPunycode, errorCode);
753 if(U_FAILURE(errorCode)) {
754 return labelLength;
755 }
756 if(!isValid) {
757 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
758 return markBadACELabel(dest, labelStart, labelLength, toASCII, info, errorCode);
759 }
760 labelString=&fromPunycode;
761 label=fromPunycode.getBuffer();
762 labelStart=0;
763 labelLength=fromPunycode.length();
764 } else {
765 wasPunycode=FALSE;
766 labelString=&dest;
767 }
768 // Validity check
769 if(labelLength==0) {
770 info.labelErrors|=UIDNA_ERROR_EMPTY_LABEL;
771 return replaceLabel(dest, destLabelStart, destLabelLength,
772 *labelString, labelLength, errorCode);
773 }
774 // labelLength>0
775 if(labelLength>=4 && label[2]==0x2d && label[3]==0x2d) {
776 // label starts with "??--"
777 info.labelErrors|=UIDNA_ERROR_HYPHEN_3_4;
778 }
779 if(label[0]==0x2d) {
780 // label starts with "-"
781 info.labelErrors|=UIDNA_ERROR_LEADING_HYPHEN;
782 }
783 if(label[labelLength-1]==0x2d) {
784 // label ends with "-"
785 info.labelErrors|=UIDNA_ERROR_TRAILING_HYPHEN;
786 }
787 // If the label was not a Punycode label, then it was the result of
788 // mapping, normalization and label segmentation.
789 // If the label was in Punycode, then we mapped it again above
790 // and checked its validity.
791 // Now we handle the STD3 restriction to LDH characters (if set)
792 // and we look for U+FFFD which indicates disallowed characters
793 // in a non-Punycode label or U+FFFD itself in a Punycode label.
794 // We also check for dots which can come from the input to a single-label function.
795 // Ok to cast away const because we own the UnicodeString.
796 UChar *s=(UChar *)label;
797 const UChar *limit=label+labelLength;
798 UChar oredChars=0;
799 // If we enforce STD3 rules, then ASCII characters other than LDH and dot are disallowed.
800 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
801 do {
802 UChar c=*s;
803 if(c<=0x7f) {
804 if(c==0x2e) {
805 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
806 *s=0xfffd;
807 } else if(disallowNonLDHDot && asciiData[c]<0) {
808 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
809 *s=0xfffd;
810 }
811 } else {
812 oredChars|=c;
813 if(disallowNonLDHDot && isNonASCIIDisallowedSTD3Valid(c)) {
814 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
815 *s=0xfffd;
816 } else if(c==0xfffd) {
817 info.labelErrors|=UIDNA_ERROR_DISALLOWED;
818 }
819 }
820 ++s;
821 } while(s<limit);
822 // Check for a leading combining mark after other validity checks
823 // so that we don't report UIDNA_ERROR_DISALLOWED for the U+FFFD from here.
824 UChar32 c;
825 int32_t cpLength=0;
826 // "Unsafe" is ok because unpaired surrogates were mapped to U+FFFD.
827 U16_NEXT_UNSAFE(label, cpLength, c);
828 if((U_GET_GC_MASK(c)&U_GC_M_MASK)!=0) {
829 info.labelErrors|=UIDNA_ERROR_LEADING_COMBINING_MARK;
830 labelString->replace(labelStart, cpLength, (UChar)0xfffd);
831 label=labelString->getBuffer()+labelStart;
832 labelLength+=1-cpLength;
833 if(labelString==&dest) {
834 destLabelLength=labelLength;
835 }
836 }
837 if((info.labelErrors&severeErrors)==0) {
838 // Do contextual checks only if we do not have U+FFFD from a severe error
839 // because U+FFFD can make these checks fail.
840 if((options&UIDNA_CHECK_BIDI)!=0 && (!info.isBiDi || info.isOkBiDi)) {
841 checkLabelBiDi(label, labelLength, info);
842 }
843 if( (options&UIDNA_CHECK_CONTEXTJ)!=0 && (oredChars&0x200c)==0x200c &&
844 !isLabelOkContextJ(label, labelLength)
845 ) {
846 info.labelErrors|=UIDNA_ERROR_CONTEXTJ;
847 }
848 if((options&UIDNA_CHECK_CONTEXTO)!=0 && oredChars>=0xb7) {
849 checkLabelContextO(label, labelLength, info);
850 }
851 if(toASCII) {
852 if(wasPunycode) {
853 // Leave a Punycode label unchanged if it has no severe errors.
854 if(destLabelLength>63) {
855 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
856 }
857 return destLabelLength;
858 } else if(oredChars>=0x80) {
859 // Contains non-ASCII characters.
860 UnicodeString punycode;
861 UChar *buffer=punycode.getBuffer(63); // 63==maximum DNS label length
862 if(buffer==NULL) {
863 errorCode=U_MEMORY_ALLOCATION_ERROR;
864 return destLabelLength;
865 }
866 buffer[0]=0x78; // Write "xn--".
867 buffer[1]=0x6e;
868 buffer[2]=0x2d;
869 buffer[3]=0x2d;
870 int32_t punycodeLength=u_strToPunycode(label, labelLength,
871 buffer+4, punycode.getCapacity()-4,
872 NULL, &errorCode);
873 if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
874 errorCode=U_ZERO_ERROR;
875 punycode.releaseBuffer(4);
876 buffer=punycode.getBuffer(4+punycodeLength);
877 if(buffer==NULL) {
878 errorCode=U_MEMORY_ALLOCATION_ERROR;
879 return destLabelLength;
880 }
881 punycodeLength=u_strToPunycode(label, labelLength,
882 buffer+4, punycode.getCapacity()-4,
883 NULL, &errorCode);
884 }
885 punycodeLength+=4;
886 punycode.releaseBuffer(punycodeLength);
887 if(U_FAILURE(errorCode)) {
888 return destLabelLength;
889 }
890 if(punycodeLength>63) {
891 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
892 }
893 return replaceLabel(dest, destLabelStart, destLabelLength,
894 punycode, punycodeLength, errorCode);
895 } else {
896 // all-ASCII label
897 if(labelLength>63) {
898 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
899 }
900 }
901 }
902 } else {
903 // If a Punycode label has severe errors,
904 // then leave it but make sure it does not look valid.
905 if(wasPunycode) {
906 info.labelErrors|=UIDNA_ERROR_INVALID_ACE_LABEL;
907 return markBadACELabel(dest, destLabelStart, destLabelLength, toASCII, info, errorCode);
908 }
909 }
910 return replaceLabel(dest, destLabelStart, destLabelLength,
911 *labelString, labelLength, errorCode);
912 }
913
914 // Make sure an ACE label does not look valid.
915 // Append U+FFFD if the label has only LDH characters.
916 // If UIDNA_USE_STD3_RULES, also replace disallowed ASCII characters with U+FFFD.
917 int32_t
markBadACELabel(UnicodeString & dest,int32_t labelStart,int32_t labelLength,UBool toASCII,IDNAInfo & info,UErrorCode & errorCode) const918 UTS46::markBadACELabel(UnicodeString &dest,
919 int32_t labelStart, int32_t labelLength,
920 UBool toASCII, IDNAInfo &info, UErrorCode &errorCode) const {
921 if(U_FAILURE(errorCode)) {
922 return 0;
923 }
924 UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
925 UBool isASCII=TRUE;
926 UBool onlyLDH=TRUE;
927 const UChar *label=dest.getBuffer()+labelStart;
928 // Ok to cast away const because we own the UnicodeString.
929 UChar *s=(UChar *)label+4; // After the initial "xn--".
930 const UChar *limit=label+labelLength;
931 do {
932 UChar c=*s;
933 if(c<=0x7f) {
934 if(c==0x2e) {
935 info.labelErrors|=UIDNA_ERROR_LABEL_HAS_DOT;
936 *s=0xfffd;
937 isASCII=onlyLDH=FALSE;
938 } else if(asciiData[c]<0) {
939 onlyLDH=FALSE;
940 if(disallowNonLDHDot) {
941 *s=0xfffd;
942 isASCII=FALSE;
943 }
944 }
945 } else {
946 isASCII=onlyLDH=FALSE;
947 }
948 } while(++s<limit);
949 if(onlyLDH) {
950 dest.insert(labelStart+labelLength, (UChar)0xfffd);
951 if(dest.isBogus()) {
952 errorCode=U_MEMORY_ALLOCATION_ERROR;
953 return 0;
954 }
955 ++labelLength;
956 } else {
957 if(toASCII && isASCII && labelLength>63) {
958 info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
959 }
960 }
961 return labelLength;
962 }
963
964 const uint32_t L_MASK=U_MASK(U_LEFT_TO_RIGHT);
965 const uint32_t R_AL_MASK=U_MASK(U_RIGHT_TO_LEFT)|U_MASK(U_RIGHT_TO_LEFT_ARABIC);
966 const uint32_t L_R_AL_MASK=L_MASK|R_AL_MASK;
967
968 const uint32_t R_AL_AN_MASK=R_AL_MASK|U_MASK(U_ARABIC_NUMBER);
969
970 const uint32_t EN_AN_MASK=U_MASK(U_EUROPEAN_NUMBER)|U_MASK(U_ARABIC_NUMBER);
971 const uint32_t R_AL_EN_AN_MASK=R_AL_MASK|EN_AN_MASK;
972 const uint32_t L_EN_MASK=L_MASK|U_MASK(U_EUROPEAN_NUMBER);
973
974 const uint32_t ES_CS_ET_ON_BN_NSM_MASK=
975 U_MASK(U_EUROPEAN_NUMBER_SEPARATOR)|
976 U_MASK(U_COMMON_NUMBER_SEPARATOR)|
977 U_MASK(U_EUROPEAN_NUMBER_TERMINATOR)|
978 U_MASK(U_OTHER_NEUTRAL)|
979 U_MASK(U_BOUNDARY_NEUTRAL)|
980 U_MASK(U_DIR_NON_SPACING_MARK);
981 const uint32_t L_EN_ES_CS_ET_ON_BN_NSM_MASK=L_EN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
982 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;
983
984 // We scan the whole label and check both for whether it contains RTL characters
985 // and whether it passes the BiDi Rule.
986 // In a BiDi domain name, all labels must pass the BiDi Rule, but we might find
987 // that a domain name is a BiDi domain name (has an RTL label) only after
988 // processing several earlier labels.
989 void
checkLabelBiDi(const UChar * label,int32_t labelLength,IDNAInfo & info) const990 UTS46::checkLabelBiDi(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
991 // IDNA2008 BiDi rule
992 // Get the directionality of the first character.
993 UChar32 c;
994 int32_t i=0;
995 U16_NEXT_UNSAFE(label, i, c);
996 uint32_t firstMask=U_MASK(u_charDirection(c));
997 // 1. The first character must be a character with BIDI property L, R
998 // or AL. If it has the R or AL property, it is an RTL label; if it
999 // has the L property, it is an LTR label.
1000 if((firstMask&~L_R_AL_MASK)!=0) {
1001 info.isOkBiDi=FALSE;
1002 }
1003 // Get the directionality of the last non-NSM character.
1004 uint32_t lastMask;
1005 for(;;) {
1006 if(i>=labelLength) {
1007 lastMask=firstMask;
1008 break;
1009 }
1010 U16_PREV_UNSAFE(label, labelLength, c);
1011 UCharDirection dir=u_charDirection(c);
1012 if(dir!=U_DIR_NON_SPACING_MARK) {
1013 lastMask=U_MASK(dir);
1014 break;
1015 }
1016 }
1017 // 3. In an RTL label, the end of the label must be a character with
1018 // BIDI property R, AL, EN or AN, followed by zero or more
1019 // characters with BIDI property NSM.
1020 // 6. In an LTR label, the end of the label must be a character with
1021 // BIDI property L or EN, followed by zero or more characters with
1022 // BIDI property NSM.
1023 if( (firstMask&L_MASK)!=0 ?
1024 (lastMask&~L_EN_MASK)!=0 :
1025 (lastMask&~R_AL_EN_AN_MASK)!=0
1026 ) {
1027 info.isOkBiDi=FALSE;
1028 }
1029 // Add the directionalities of the intervening characters.
1030 uint32_t mask=firstMask|lastMask;
1031 while(i<labelLength) {
1032 U16_NEXT_UNSAFE(label, i, c);
1033 mask|=U_MASK(u_charDirection(c));
1034 }
1035 if(firstMask&L_MASK) {
1036 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1037 // ES, CS, ET, ON, BN and NSM are allowed.
1038 if((mask&~L_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1039 info.isOkBiDi=FALSE;
1040 }
1041 } else {
1042 // 2. In an RTL label, only characters with the BIDI properties R, AL,
1043 // AN, EN, ES, CS, ET, ON, BN and NSM are allowed.
1044 if((mask&~R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
1045 info.isOkBiDi=FALSE;
1046 }
1047 // 4. In an RTL label, if an EN is present, no AN may be present, and
1048 // vice versa.
1049 if((mask&EN_AN_MASK)==EN_AN_MASK) {
1050 info.isOkBiDi=FALSE;
1051 }
1052 }
1053 // An RTL label is a label that contains at least one character of type
1054 // R, AL or AN. [...]
1055 // A "BIDI domain name" is a domain name that contains at least one RTL
1056 // label. [...]
1057 // The following rule, consisting of six conditions, applies to labels
1058 // in BIDI domain names.
1059 if((mask&R_AL_AN_MASK)!=0) {
1060 info.isBiDi=TRUE;
1061 }
1062 }
1063
1064 // Special code for the ASCII prefix of a BiDi domain name.
1065 // The ASCII prefix is all-LTR.
1066
1067 // IDNA2008 BiDi rule, parts relevant to ASCII labels:
1068 // 1. The first character must be a character with BIDI property L [...]
1069 // 5. In an LTR label, only characters with the BIDI properties L, EN,
1070 // ES, CS, ET, ON, BN and NSM are allowed.
1071 // 6. In an LTR label, the end of the label must be a character with
1072 // BIDI property L or EN [...]
1073
1074 // UTF-16 version, called for mapped ASCII prefix.
1075 // Cannot contain uppercase A-Z.
1076 // s[length-1] must be the trailing dot.
1077 static UBool
isASCIIOkBiDi(const UChar * s,int32_t length)1078 isASCIIOkBiDi(const UChar *s, int32_t length) {
1079 int32_t labelStart=0;
1080 for(int32_t i=0; i<length; ++i) {
1081 UChar c=s[i];
1082 if(c==0x2e) { // dot
1083 if(i>labelStart) {
1084 c=s[i-1];
1085 if(!(0x61<=c && c<=0x7a) && !(0x30<=c && c<=0x39)) {
1086 // Last character in the label is not an L or EN.
1087 return FALSE;
1088 }
1089 }
1090 labelStart=i+1;
1091 } else if(i==labelStart) {
1092 if(!(0x61<=c && c<=0x7a)) {
1093 // First character in the label is not an L.
1094 return FALSE;
1095 }
1096 } else {
1097 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1098 // Intermediate character in the label is a B, S or WS.
1099 return FALSE;
1100 }
1101 }
1102 }
1103 return TRUE;
1104 }
1105
1106 // UTF-8 version, called for source ASCII prefix.
1107 // Can contain uppercase A-Z.
1108 // s[length-1] must be the trailing dot.
1109 static UBool
isASCIIOkBiDi(const char * s,int32_t length)1110 isASCIIOkBiDi(const char *s, int32_t length) {
1111 int32_t labelStart=0;
1112 for(int32_t i=0; i<length; ++i) {
1113 char c=s[i];
1114 if(c==0x2e) { // dot
1115 if(i>labelStart) {
1116 c=s[i-1];
1117 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a) && !(0x30<=c && c<=0x39)) {
1118 // Last character in the label is not an L or EN.
1119 return FALSE;
1120 }
1121 }
1122 labelStart=i+1;
1123 } else if(i==labelStart) {
1124 if(!(0x61<=c && c<=0x7a) && !(0x41<=c && c<=0x5a)) {
1125 // First character in the label is not an L.
1126 return FALSE;
1127 }
1128 } else {
1129 if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
1130 // Intermediate character in the label is a B, S or WS.
1131 return FALSE;
1132 }
1133 }
1134 }
1135 return TRUE;
1136 }
1137
1138 UBool
isLabelOkContextJ(const UChar * label,int32_t labelLength) const1139 UTS46::isLabelOkContextJ(const UChar *label, int32_t labelLength) const {
1140 // [IDNA2008-Tables]
1141 // 200C..200D ; CONTEXTJ # ZERO WIDTH NON-JOINER..ZERO WIDTH JOINER
1142 for(int32_t i=0; i<labelLength; ++i) {
1143 if(label[i]==0x200c) {
1144 // Appendix A.1. ZERO WIDTH NON-JOINER
1145 // Rule Set:
1146 // False;
1147 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1148 // If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C
1149 // (Joining_Type:T)*(Joining_Type:{R,D})) Then True;
1150 if(i==0) {
1151 return FALSE;
1152 }
1153 UChar32 c;
1154 int32_t j=i;
1155 U16_PREV_UNSAFE(label, j, c);
1156 if(uts46Norm2.getCombiningClass(c)==9) {
1157 continue;
1158 }
1159 // check precontext (Joining_Type:{L,D})(Joining_Type:T)*
1160 for(;;) {
1161 UJoiningType type=ubidi_getJoiningType(c);
1162 if(type==U_JT_TRANSPARENT) {
1163 if(j==0) {
1164 return FALSE;
1165 }
1166 U16_PREV_UNSAFE(label, j, c);
1167 } else if(type==U_JT_LEFT_JOINING || type==U_JT_DUAL_JOINING) {
1168 break; // precontext fulfilled
1169 } else {
1170 return FALSE;
1171 }
1172 }
1173 // check postcontext (Joining_Type:T)*(Joining_Type:{R,D})
1174 for(j=i+1;;) {
1175 if(j==labelLength) {
1176 return FALSE;
1177 }
1178 U16_NEXT_UNSAFE(label, j, c);
1179 UJoiningType type=ubidi_getJoiningType(c);
1180 if(type==U_JT_TRANSPARENT) {
1181 // just skip this character
1182 } else if(type==U_JT_RIGHT_JOINING || type==U_JT_DUAL_JOINING) {
1183 break; // postcontext fulfilled
1184 } else {
1185 return FALSE;
1186 }
1187 }
1188 } else if(label[i]==0x200d) {
1189 // Appendix A.2. ZERO WIDTH JOINER (U+200D)
1190 // Rule Set:
1191 // False;
1192 // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
1193 if(i==0) {
1194 return FALSE;
1195 }
1196 UChar32 c;
1197 int32_t j=i;
1198 U16_PREV_UNSAFE(label, j, c);
1199 if(uts46Norm2.getCombiningClass(c)!=9) {
1200 return FALSE;
1201 }
1202 }
1203 }
1204 return TRUE;
1205 }
1206
1207 void
checkLabelContextO(const UChar * label,int32_t labelLength,IDNAInfo & info) const1208 UTS46::checkLabelContextO(const UChar *label, int32_t labelLength, IDNAInfo &info) const {
1209 int32_t labelEnd=labelLength-1; // inclusive
1210 int32_t arabicDigits=0; // -1 for 066x, +1 for 06Fx
1211 for(int32_t i=0; i<=labelEnd; ++i) {
1212 UChar32 c=label[i];
1213 if(c<0xb7) {
1214 // ASCII fastpath
1215 } else if(c<=0x6f9) {
1216 if(c==0xb7) {
1217 // Appendix A.3. MIDDLE DOT (U+00B7)
1218 // Rule Set:
1219 // False;
1220 // If Before(cp) .eq. U+006C And
1221 // After(cp) .eq. U+006C Then True;
1222 if(!(0<i && label[i-1]==0x6c &&
1223 i<labelEnd && label[i+1]==0x6c)) {
1224 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1225 }
1226 } else if(c==0x375) {
1227 // Appendix A.4. GREEK LOWER NUMERAL SIGN (KERAIA) (U+0375)
1228 // Rule Set:
1229 // False;
1230 // If Script(After(cp)) .eq. Greek Then True;
1231 UScriptCode script=USCRIPT_INVALID_CODE;
1232 if(i<labelEnd) {
1233 UErrorCode errorCode=U_ZERO_ERROR;
1234 int32_t j=i+1;
1235 U16_NEXT(label, j, labelLength, c);
1236 script=uscript_getScript(c, &errorCode);
1237 }
1238 if(script!=USCRIPT_GREEK) {
1239 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1240 }
1241 } else if(c==0x5f3 || c==0x5f4) {
1242 // Appendix A.5. HEBREW PUNCTUATION GERESH (U+05F3)
1243 // Rule Set:
1244 // False;
1245 // If Script(Before(cp)) .eq. Hebrew Then True;
1246 //
1247 // Appendix A.6. HEBREW PUNCTUATION GERSHAYIM (U+05F4)
1248 // Rule Set:
1249 // False;
1250 // If Script(Before(cp)) .eq. Hebrew Then True;
1251 UScriptCode script=USCRIPT_INVALID_CODE;
1252 if(0<i) {
1253 UErrorCode errorCode=U_ZERO_ERROR;
1254 int32_t j=i;
1255 U16_PREV(label, 0, j, c);
1256 script=uscript_getScript(c, &errorCode);
1257 }
1258 if(script!=USCRIPT_HEBREW) {
1259 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1260 }
1261 } else if(0x660<=c /* && c<=0x6f9 */) {
1262 // Appendix A.8. ARABIC-INDIC DIGITS (0660..0669)
1263 // Rule Set:
1264 // True;
1265 // For All Characters:
1266 // If cp .in. 06F0..06F9 Then False;
1267 // End For;
1268 //
1269 // Appendix A.9. EXTENDED ARABIC-INDIC DIGITS (06F0..06F9)
1270 // Rule Set:
1271 // True;
1272 // For All Characters:
1273 // If cp .in. 0660..0669 Then False;
1274 // End For;
1275 if(c<=0x669) {
1276 if(arabicDigits>0) {
1277 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1278 }
1279 arabicDigits=-1;
1280 } else if(0x6f0<=c) {
1281 if(arabicDigits<0) {
1282 info.labelErrors|=UIDNA_ERROR_CONTEXTO_DIGITS;
1283 }
1284 arabicDigits=1;
1285 }
1286 }
1287 } else if(c==0x30fb) {
1288 // Appendix A.7. KATAKANA MIDDLE DOT (U+30FB)
1289 // Rule Set:
1290 // False;
1291 // For All Characters:
1292 // If Script(cp) .in. {Hiragana, Katakana, Han} Then True;
1293 // End For;
1294 UErrorCode errorCode=U_ZERO_ERROR;
1295 for(int j=0;;) {
1296 if(j>labelEnd) {
1297 info.labelErrors|=UIDNA_ERROR_CONTEXTO_PUNCTUATION;
1298 break;
1299 }
1300 U16_NEXT(label, j, labelLength, c);
1301 UScriptCode script=uscript_getScript(c, &errorCode);
1302 if(script==USCRIPT_HIRAGANA || script==USCRIPT_KATAKANA || script==USCRIPT_HAN) {
1303 break;
1304 }
1305 }
1306 }
1307 }
1308 }
1309
1310 U_NAMESPACE_END
1311
1312 // C API ------------------------------------------------------------------- ***
1313
1314 U_NAMESPACE_USE
1315
1316 U_CAPI UIDNA * U_EXPORT2
uidna_openUTS46(uint32_t options,UErrorCode * pErrorCode)1317 uidna_openUTS46(uint32_t options, UErrorCode *pErrorCode) {
1318 return reinterpret_cast<UIDNA *>(IDNA::createUTS46Instance(options, *pErrorCode));
1319 }
1320
1321 U_CAPI void U_EXPORT2
uidna_close(UIDNA * idna)1322 uidna_close(UIDNA *idna) {
1323 delete reinterpret_cast<IDNA *>(idna);
1324 }
1325
1326 static UBool
checkArgs(const void * label,int32_t length,void * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1327 checkArgs(const void *label, int32_t length,
1328 void *dest, int32_t capacity,
1329 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1330 if(U_FAILURE(*pErrorCode)) {
1331 return FALSE;
1332 }
1333 // sizeof(UIDNAInfo)=16 in the first API version.
1334 if(pInfo==NULL || pInfo->size<16) {
1335 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1336 return FALSE;
1337 }
1338 if( (label==NULL ? length!=0 : length<-1) ||
1339 (dest==NULL ? capacity!=0 : capacity<0) ||
1340 (dest==label && label!=NULL)
1341 ) {
1342 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1343 return FALSE;
1344 }
1345 // Set all *pInfo bytes to 0 except for the size field itself.
1346 uprv_memset(&pInfo->size+1, 0, pInfo->size-sizeof(pInfo->size));
1347 return TRUE;
1348 }
1349
1350 static void
idnaInfoToStruct(IDNAInfo & info,UIDNAInfo * pInfo)1351 idnaInfoToStruct(IDNAInfo &info, UIDNAInfo *pInfo) {
1352 pInfo->isTransitionalDifferent=info.isTransitionalDifferent();
1353 pInfo->errors=info.getErrors();
1354 }
1355
1356 U_CAPI int32_t U_EXPORT2
uidna_labelToASCII(const UIDNA * idna,const UChar * label,int32_t length,UChar * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1357 uidna_labelToASCII(const UIDNA *idna,
1358 const UChar *label, int32_t length,
1359 UChar *dest, int32_t capacity,
1360 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1361 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1362 return 0;
1363 }
1364 UnicodeString src((UBool)(length<0), label, length);
1365 UnicodeString destString(dest, 0, capacity);
1366 IDNAInfo info;
1367 reinterpret_cast<const IDNA *>(idna)->labelToASCII(src, destString, info, *pErrorCode);
1368 idnaInfoToStruct(info, pInfo);
1369 return destString.extract(dest, capacity, *pErrorCode);
1370 }
1371
1372 U_CAPI int32_t U_EXPORT2
uidna_labelToUnicode(const UIDNA * idna,const UChar * label,int32_t length,UChar * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1373 uidna_labelToUnicode(const UIDNA *idna,
1374 const UChar *label, int32_t length,
1375 UChar *dest, int32_t capacity,
1376 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1377 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1378 return 0;
1379 }
1380 UnicodeString src((UBool)(length<0), label, length);
1381 UnicodeString destString(dest, 0, capacity);
1382 IDNAInfo info;
1383 reinterpret_cast<const IDNA *>(idna)->labelToUnicode(src, destString, info, *pErrorCode);
1384 idnaInfoToStruct(info, pInfo);
1385 return destString.extract(dest, capacity, *pErrorCode);
1386 }
1387
1388 U_CAPI int32_t U_EXPORT2
uidna_nameToASCII(const UIDNA * idna,const UChar * name,int32_t length,UChar * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1389 uidna_nameToASCII(const UIDNA *idna,
1390 const UChar *name, int32_t length,
1391 UChar *dest, int32_t capacity,
1392 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1393 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1394 return 0;
1395 }
1396 UnicodeString src((UBool)(length<0), name, length);
1397 UnicodeString destString(dest, 0, capacity);
1398 IDNAInfo info;
1399 reinterpret_cast<const IDNA *>(idna)->nameToASCII(src, destString, info, *pErrorCode);
1400 idnaInfoToStruct(info, pInfo);
1401 return destString.extract(dest, capacity, *pErrorCode);
1402 }
1403
1404 U_CAPI int32_t U_EXPORT2
uidna_nameToUnicode(const UIDNA * idna,const UChar * name,int32_t length,UChar * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1405 uidna_nameToUnicode(const UIDNA *idna,
1406 const UChar *name, int32_t length,
1407 UChar *dest, int32_t capacity,
1408 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1409 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1410 return 0;
1411 }
1412 UnicodeString src((UBool)(length<0), name, length);
1413 UnicodeString destString(dest, 0, capacity);
1414 IDNAInfo info;
1415 reinterpret_cast<const IDNA *>(idna)->nameToUnicode(src, destString, info, *pErrorCode);
1416 idnaInfoToStruct(info, pInfo);
1417 return destString.extract(dest, capacity, *pErrorCode);
1418 }
1419
1420 U_CAPI int32_t U_EXPORT2
uidna_labelToASCII_UTF8(const UIDNA * idna,const char * label,int32_t length,char * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1421 uidna_labelToASCII_UTF8(const UIDNA *idna,
1422 const char *label, int32_t length,
1423 char *dest, int32_t capacity,
1424 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1425 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1426 return 0;
1427 }
1428 StringPiece src(label, length<0 ? static_cast<int32_t>(uprv_strlen(label)) : length);
1429 CheckedArrayByteSink sink(dest, capacity);
1430 IDNAInfo info;
1431 reinterpret_cast<const IDNA *>(idna)->labelToASCII_UTF8(src, sink, info, *pErrorCode);
1432 idnaInfoToStruct(info, pInfo);
1433 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1434 }
1435
1436 U_CAPI int32_t U_EXPORT2
uidna_labelToUnicodeUTF8(const UIDNA * idna,const char * label,int32_t length,char * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1437 uidna_labelToUnicodeUTF8(const UIDNA *idna,
1438 const char *label, int32_t length,
1439 char *dest, int32_t capacity,
1440 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1441 if(!checkArgs(label, length, dest, capacity, pInfo, pErrorCode)) {
1442 return 0;
1443 }
1444 StringPiece src(label, length<0 ? static_cast<int32_t>(uprv_strlen(label)) : length);
1445 CheckedArrayByteSink sink(dest, capacity);
1446 IDNAInfo info;
1447 reinterpret_cast<const IDNA *>(idna)->labelToUnicodeUTF8(src, sink, info, *pErrorCode);
1448 idnaInfoToStruct(info, pInfo);
1449 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1450 }
1451
1452 U_CAPI int32_t U_EXPORT2
uidna_nameToASCII_UTF8(const UIDNA * idna,const char * name,int32_t length,char * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1453 uidna_nameToASCII_UTF8(const UIDNA *idna,
1454 const char *name, int32_t length,
1455 char *dest, int32_t capacity,
1456 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1457 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1458 return 0;
1459 }
1460 StringPiece src(name, length<0 ? static_cast<int32_t>(uprv_strlen(name)) : length);
1461 CheckedArrayByteSink sink(dest, capacity);
1462 IDNAInfo info;
1463 reinterpret_cast<const IDNA *>(idna)->nameToASCII_UTF8(src, sink, info, *pErrorCode);
1464 idnaInfoToStruct(info, pInfo);
1465 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1466 }
1467
1468 U_CAPI int32_t U_EXPORT2
uidna_nameToUnicodeUTF8(const UIDNA * idna,const char * name,int32_t length,char * dest,int32_t capacity,UIDNAInfo * pInfo,UErrorCode * pErrorCode)1469 uidna_nameToUnicodeUTF8(const UIDNA *idna,
1470 const char *name, int32_t length,
1471 char *dest, int32_t capacity,
1472 UIDNAInfo *pInfo, UErrorCode *pErrorCode) {
1473 if(!checkArgs(name, length, dest, capacity, pInfo, pErrorCode)) {
1474 return 0;
1475 }
1476 StringPiece src(name, length<0 ? static_cast<int32_t>(uprv_strlen(name)) : length);
1477 CheckedArrayByteSink sink(dest, capacity);
1478 IDNAInfo info;
1479 reinterpret_cast<const IDNA *>(idna)->nameToUnicodeUTF8(src, sink, info, *pErrorCode);
1480 idnaInfoToStruct(info, pInfo);
1481 return u_terminateChars(dest, capacity, sink.NumberOfBytesAppended(), pErrorCode);
1482 }
1483
1484 #endif // UCONFIG_NO_IDNA
1485