-
Notifications
You must be signed in to change notification settings - Fork 1.9k
/
URIUtil.java
1386 lines (1261 loc) · 40.8 KB
/
URIUtil.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import org.eclipse.jetty.util.Utf8Appendable.NotUtf8Exception;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* URI Utility methods.
* <p>
* This class assists with the decoding and encoding or HTTP URI's.
* It differs from the java.net.URL class as it does not provide
* communications ability, but it does assist with query string
* formatting.
* </p>
*
* @see UrlEncoded
*/
public class URIUtil
implements Cloneable
{
private static final Logger LOG = Log.getLogger(URIUtil.class);
public static final String SLASH = "/";
public static final String HTTP = "http";
public static final String HTTPS = "https";
// Use UTF-8 as per http://www.w3.org/TR/html40/appendix/notes.html#non-ascii-chars
public static final Charset __CHARSET = StandardCharsets.UTF_8;
private URIUtil()
{
}
/**
* Encode a URI path.
* This is the same encoding offered by URLEncoder, except that
* the '/' character is not encoded.
*
* @param path The path the encode
* @return The encoded path
*/
public static String encodePath(String path)
{
if (path == null || path.length() == 0)
return path;
StringBuilder buf = encodePath(null, path, 0);
return buf == null ? path : buf.toString();
}
/**
* Encode a URI path.
*
* @param path The path the encode
* @param buf StringBuilder to encode path into (or null)
* @return The StringBuilder or null if no substitutions required.
*/
public static StringBuilder encodePath(StringBuilder buf, String path)
{
return encodePath(buf, path, 0);
}
/**
* Encode a URI path.
*
* @param path The path the encode
* @param buf StringBuilder to encode path into (or null)
* @return The StringBuilder or null if no substitutions required.
*/
private static StringBuilder encodePath(StringBuilder buf, String path, int offset)
{
byte[] bytes = null;
if (buf == null)
{
loop:
for (int i = offset; i < path.length(); i++)
{
char c = path.charAt(i);
switch (c)
{
case '%':
case '?':
case ';':
case '#':
case '"':
case '\'':
case '<':
case '>':
case ' ':
case '[':
case '\\':
case ']':
case '^':
case '`':
case '{':
case '|':
case '}':
buf = new StringBuilder(path.length() * 2);
break loop;
default:
if (c < 0x20 || c >= 0x7f)
{
bytes = path.getBytes(URIUtil.__CHARSET);
buf = new StringBuilder(path.length() * 2);
break loop;
}
}
}
if (buf == null)
return null;
}
int i;
loop:
for (i = offset; i < path.length(); i++)
{
char c = path.charAt(i);
switch (c)
{
case '%':
buf.append("%25");
continue;
case '?':
buf.append("%3F");
continue;
case ';':
buf.append("%3B");
continue;
case '#':
buf.append("%23");
continue;
case '"':
buf.append("%22");
continue;
case '\'':
buf.append("%27");
continue;
case '<':
buf.append("%3C");
continue;
case '>':
buf.append("%3E");
continue;
case ' ':
buf.append("%20");
continue;
case '[':
buf.append("%5B");
continue;
case '\\':
buf.append("%5C");
continue;
case ']':
buf.append("%5D");
continue;
case '^':
buf.append("%5E");
continue;
case '`':
buf.append("%60");
continue;
case '{':
buf.append("%7B");
continue;
case '|':
buf.append("%7C");
continue;
case '}':
buf.append("%7D");
continue;
default:
if (c < 0x20 || c >= 0x7f)
{
bytes = path.getBytes(URIUtil.__CHARSET);
break loop;
}
buf.append(c);
}
}
if (bytes != null)
{
for (; i < bytes.length; i++)
{
byte c = bytes[i];
switch (c)
{
case '%':
buf.append("%25");
continue;
case '?':
buf.append("%3F");
continue;
case ';':
buf.append("%3B");
continue;
case '#':
buf.append("%23");
continue;
case '"':
buf.append("%22");
continue;
case '\'':
buf.append("%27");
continue;
case '<':
buf.append("%3C");
continue;
case '>':
buf.append("%3E");
continue;
case ' ':
buf.append("%20");
continue;
case '[':
buf.append("%5B");
continue;
case '\\':
buf.append("%5C");
continue;
case ']':
buf.append("%5D");
continue;
case '^':
buf.append("%5E");
continue;
case '`':
buf.append("%60");
continue;
case '{':
buf.append("%7B");
continue;
case '|':
buf.append("%7C");
continue;
case '}':
buf.append("%7D");
continue;
default:
if (c < 0x20 || c >= 0x7f)
{
buf.append('%');
TypeUtil.toHex(c, buf);
}
else
buf.append((char)c);
}
}
}
return buf;
}
/**
* Encode a raw URI String and convert any raw spaces to
* their "%20" equivalent.
*
* @param str input raw string
* @return output with spaces converted to "%20"
*/
public static String encodeSpaces(String str)
{
return StringUtil.replace(str, " ", "%20");
}
/**
* Encode a raw String and convert any specific characters to their URI encoded equivalent.
*
* @param str input raw string
* @param charsToEncode the list of raw characters that need to be encoded (if encountered)
* @return output with specified characters encoded.
*/
@SuppressWarnings("Duplicates")
public static String encodeSpecific(String str, String charsToEncode)
{
if ((str == null) || (str.length() == 0))
return null;
if ((charsToEncode == null) || (charsToEncode.length() == 0))
return str;
char[] find = charsToEncode.toCharArray();
int len = str.length();
StringBuilder ret = new StringBuilder((int)(len * 0.20d));
for (int i = 0; i < len; i++)
{
char c = str.charAt(i);
boolean escaped = false;
for (char f : find)
{
if (c == f)
{
escaped = true;
ret.append('%');
int d = 0xf & ((0xF0 & c) >> 4);
ret.append((char)((d > 9 ? ('A' - 10) : '0') + d));
d = 0xf & c;
ret.append((char)((d > 9 ? ('A' - 10) : '0') + d));
break;
}
}
if (!escaped)
{
ret.append(c);
}
}
return ret.toString();
}
/**
* Decode a raw String and convert any specific URI encoded sequences into characters.
*
* @param str input raw string
* @param charsToDecode the list of raw characters that need to be decoded (if encountered), leaving all other encoded sequences alone.
* @return output with specified characters decoded.
*/
@SuppressWarnings("Duplicates")
public static String decodeSpecific(String str, String charsToDecode)
{
if ((str == null) || (str.length() == 0))
return null;
if ((charsToDecode == null) || (charsToDecode.length() == 0))
return str;
int idx = str.indexOf('%');
if (idx == -1)
{
// no hits
return str;
}
char[] find = charsToDecode.toCharArray();
int len = str.length();
Utf8StringBuilder ret = new Utf8StringBuilder(len);
ret.append(str, 0, idx);
for (int i = idx; i < len; i++)
{
char c = str.charAt(i);
switch (c)
{
case '%':
if ((i + 2) < len)
{
char u = str.charAt(i + 1);
char l = str.charAt(i + 2);
char result = (char)(0xff & (TypeUtil.convertHexDigit(u) * 16 + TypeUtil.convertHexDigit(l)));
boolean decoded = false;
for (char f : find)
{
if (f == result)
{
ret.append(result);
decoded = true;
break;
}
}
if (decoded)
{
i += 2;
}
else
{
ret.append(c);
}
}
else
{
throw new IllegalArgumentException("Bad URI % encoding");
}
break;
default:
ret.append(c);
break;
}
}
return ret.toString();
}
/**
* Encode a URI path.
*
* @param path The path the encode
* @param buf StringBuilder to encode path into (or null)
* @param encode String of characters to encode. % is always encoded.
* @return The StringBuilder or null if no substitutions required.
*/
public static StringBuilder encodeString(StringBuilder buf,
String path,
String encode)
{
if (buf == null)
{
for (int i = 0; i < path.length(); i++)
{
char c = path.charAt(i);
if (c == '%' || encode.indexOf(c) >= 0)
{
buf = new StringBuilder(path.length() << 1);
break;
}
}
if (buf == null)
return null;
}
for (int i = 0; i < path.length(); i++)
{
char c = path.charAt(i);
if (c == '%' || encode.indexOf(c) >= 0)
{
buf.append('%');
StringUtil.append(buf, (byte)(0xff & c), 16);
}
else
buf.append(c);
}
return buf;
}
/* Decode a URI path and strip parameters
*/
public static String decodePath(String path)
{
return decodePath(path, 0, path.length());
}
/* Decode a URI path and strip parameters of UTF-8 path
*/
public static String decodePath(String path, int offset, int length)
{
try
{
Utf8StringBuilder builder = null;
int end = offset + length;
for (int i = offset; i < end; i++)
{
char c = path.charAt(i);
switch (c)
{
case '%':
if (builder == null)
{
builder = new Utf8StringBuilder(path.length());
builder.append(path, offset, i - offset);
}
if ((i + 2) < end)
{
char u = path.charAt(i + 1);
if (u == 'u')
{
// In Jetty-10 UTF16 encoding is only supported with UriCompliance.Violation.UTF16_ENCODINGS.
// This is wrong. This is a codepoint not a char
builder.append((char)(0xffff & TypeUtil.parseInt(path, i + 2, 4, 16)));
i += 5;
}
else
{
builder.append((byte)(0xff & (TypeUtil.convertHexDigit(u) * 16 + TypeUtil.convertHexDigit(path.charAt(i + 2)))));
i += 2;
}
}
else
{
throw new IllegalArgumentException("Bad URI % encoding");
}
break;
case ';':
if (builder == null)
{
builder = new Utf8StringBuilder(path.length());
builder.append(path, offset, i - offset);
}
while (++i < end)
{
if (path.charAt(i) == '/')
{
builder.append('/');
break;
}
}
break;
default:
if (builder != null)
builder.append(c);
break;
}
}
if (builder != null)
return builder.toString();
if (offset == 0 && length == path.length())
return path;
return path.substring(offset, end);
}
catch (NotUtf8Exception e)
{
LOG.debug(path.substring(offset, offset + length) + " " + e);
return decodeISO88591Path(path, offset, length);
}
catch (IllegalArgumentException e)
{
throw e;
}
catch (Exception e)
{
throw new IllegalArgumentException("cannot decode URI", e);
}
}
/* Decode a URI path and strip parameters of ISO-8859-1 path
*/
private static String decodeISO88591Path(String path, int offset, int length)
{
StringBuilder builder = null;
int end = offset + length;
for (int i = offset; i < end; i++)
{
char c = path.charAt(i);
switch (c)
{
case '%':
if (builder == null)
{
builder = new StringBuilder(path.length());
builder.append(path, offset, i - offset);
}
if ((i + 2) < end)
{
char u = path.charAt(i + 1);
if (u == 'u')
{
// In Jetty-10 UTF16 encoding is only supported with UriCompliance.Violation.UTF16_ENCODINGS. // This is wrong. This is a codepoint not a char
builder.append((char)(0xffff & TypeUtil.parseInt(path, i + 2, 4, 16)));
i += 5;
}
else
{
builder.append((char)(0xff & (TypeUtil.convertHexDigit(u) * 16 + TypeUtil.convertHexDigit(path.charAt(i + 2)))));
i += 2;
}
}
else
{
throw new IllegalArgumentException();
}
break;
case ';':
if (builder == null)
{
builder = new StringBuilder(path.length());
builder.append(path, offset, i - offset);
}
while (++i < end)
{
if (path.charAt(i) == '/')
{
builder.append('/');
break;
}
}
break;
default:
if (builder != null)
builder.append(c);
break;
}
}
if (builder != null)
return builder.toString();
if (offset == 0 && length == path.length())
return path;
return path.substring(offset, end);
}
/**
* Add two encoded URI path segments.
* Handles null and empty paths, path and query params
* (eg ?a=b or ;JSESSIONID=xxx) and avoids duplicate '/'
*
* @param p1 URI path segment (should be encoded)
* @param p2 URI path segment (should be encoded)
* @return Legally combined path segments.
*/
public static String addEncodedPaths(String p1, String p2)
{
if (p1 == null || p1.length() == 0)
{
if (p1 != null && p2 == null)
return p1;
return p2;
}
if (p2 == null || p2.length() == 0)
return p1;
int split = p1.indexOf(';');
if (split < 0)
split = p1.indexOf('?');
if (split == 0)
return p2 + p1;
if (split < 0)
split = p1.length();
StringBuilder buf = new StringBuilder(p1.length() + p2.length() + 2);
buf.append(p1);
if (buf.charAt(split - 1) == '/')
{
if (p2.startsWith(URIUtil.SLASH))
{
buf.deleteCharAt(split - 1);
buf.insert(split - 1, p2);
}
else
buf.insert(split, p2);
}
else
{
if (p2.startsWith(URIUtil.SLASH))
buf.insert(split, p2);
else
{
buf.insert(split, '/');
buf.insert(split + 1, p2);
}
}
return buf.toString();
}
/**
* Add two Decoded URI path segments.
* Handles null and empty paths. Path and query params (eg ?a=b or
* ;JSESSIONID=xxx) are not handled
*
* @param p1 URI path segment (should be decoded)
* @param p2 URI path segment (should be decoded)
* @return Legally combined path segments.
*/
public static String addPaths(String p1, String p2)
{
if (p1 == null || p1.length() == 0)
{
if (p1 != null && p2 == null)
return p1;
return p2;
}
if (p2 == null || p2.length() == 0)
return p1;
boolean p1EndsWithSlash = p1.endsWith(SLASH);
boolean p2StartsWithSlash = p2.startsWith(SLASH);
if (p1EndsWithSlash && p2StartsWithSlash)
{
if (p2.length() == 1)
return p1;
if (p1.length() == 1)
return p2;
}
StringBuilder buf = new StringBuilder(p1.length() + p2.length() + 2);
buf.append(p1);
if (p1.endsWith(SLASH))
{
if (p2.startsWith(SLASH))
buf.setLength(buf.length() - 1);
}
else
{
if (!p2.startsWith(SLASH))
buf.append(SLASH);
}
buf.append(p2);
return buf.toString();
}
/** Add a path and a query string
* @param path The path which may already contain contain a query
* @param query The query string or null if no query to be added
* @return The path with any non null query added after a '?' or '&' as appropriate.
*/
public static String addPathQuery(String path, String query)
{
if (query == null)
return path;
if (path.indexOf('?') >= 0)
return path + '&' + query;
return path + '?' + query;
}
/**
* Given a URI, attempt to get the last segment.
* <p>
* If this is a {@code jar:file://} style URI, then
* the JAR filename is returned (not the deep {@code !/path} location)
* </p>
*
* @param uri the URI to look in
* @return the last segment.
*/
public static String getUriLastPathSegment(URI uri)
{
String ssp = uri.getSchemeSpecificPart();
// strip off deep jar:file: reference information
int idx = ssp.indexOf("!/");
if (idx != -1)
{
ssp = ssp.substring(0, idx);
}
// Strip off trailing '/' if present
if (ssp.endsWith("/"))
{
ssp = ssp.substring(0, ssp.length() - 1);
}
// Only interested in last segment
idx = ssp.lastIndexOf('/');
if (idx != -1)
{
ssp = ssp.substring(idx + 1);
}
return ssp;
}
/**
* Return the parent Path.
* Treat a URI like a directory path and return the parent directory.
*
* @param p the path to return a parent reference to
* @return the parent path of the URI
*/
public static String parentPath(String p)
{
if (p == null || URIUtil.SLASH.equals(p))
return null;
int slash = p.lastIndexOf('/', p.length() - 2);
if (slash >= 0)
return p.substring(0, slash + 1);
return null;
}
/**
* Convert a partial URI to a canonical form.
* <p>
* All segments of "." and ".." are factored out.
* Null is returned if the path tries to .. above its root.
* </p>
*
* @param uri the encoded URI from the path onwards, which may contain query strings and/or fragments
* @return the canonical path, or null if path traversal above root.
* @see #canonicalPath(String)
*/
public static String canonicalURI(String uri)
{
if (uri == null || uri.isEmpty())
return uri;
boolean slash = true;
int end = uri.length();
int i = 0;
// Initially just loop looking if we may need to normalize
loop: while (i < end)
{
char c = uri.charAt(i);
switch (c)
{
case '/':
slash = true;
break;
case '.':
if (slash)
break loop;
slash = false;
break;
case '?':
case '#':
// Nothing to normalize so return original path
return uri;
default:
slash = false;
}
i++;
}
// Nothing to normalize so return original path
if (i == end)
return uri;
// We probably need to normalize, so copy to path so far into builder
StringBuilder canonical = new StringBuilder(uri.length());
canonical.append(uri, 0, i);
// Loop looking for single and double dot segments
int dots = 1;
i++;
loop : while (i < end)
{
char c = uri.charAt(i);
switch (c)
{
case '/':
if (doDotsSlash(canonical, dots))
return null;
slash = true;
dots = 0;
break;
case '?':
case '#':
// finish normalization at a query
break loop;
case '.':
// Count dots only if they are leading in the segment
if (dots > 0)
dots++;
else if (slash)
dots = 1;
else
canonical.append('.');
slash = false;
break;
default:
// Add leading dots to the path
while (dots-- > 0)
canonical.append('.');
canonical.append(c);
dots = 0;
slash = false;
}
i++;
}
// process any remaining dots
if (doDots(canonical, dots))
return null;
// append any query
if (i < end)
canonical.append(uri, i, end);
return canonical.toString();
}
/**
* @param path the encoded URI from the path onwards, which may contain query strings and/or fragments
* @return the canonical path, or null if path traversal above root.
* @deprecated Use {@link #canonicalURI(String)}
*/
@Deprecated
public static String canonicalEncodedPath(String path)
{
return canonicalURI(path);
}
/**
* Convert a decoded URI path to a canonical form.
* <p>
* All segments of "." and ".." are factored out.
* Null is returned if the path tries to .. above its root.
* </p>
*
* @param path the decoded URI path to convert. Any special characters (e.g. '?', "#") are assumed to be part of
* the path segments.
* @return the canonical path, or null if path traversal above root.
* @see #canonicalURI(String)
*/
public static String canonicalPath(String path)
{
if (path == null || path.isEmpty())
return path;
boolean slash = true;
int end = path.length();
int i = 0;
// Initially just loop looking if we may need to normalize
loop: while (i < end)
{
char c = path.charAt(i);
switch (c)
{
case '/':
slash = true;
break;
case '.':
if (slash)
break loop;
slash = false;
break;
default:
slash = false;
}
i++;
}
// Nothing to normalize so return original path
if (i == end)
return path;
// We probably need to normalize, so copy to path so far into builder
StringBuilder canonical = new StringBuilder(path.length());
canonical.append(path, 0, i);
// Loop looking for single and double dot segments
int dots = 1;
i++;
while (i < end)
{
char c = path.charAt(i);
switch (c)
{
case '/':
if (doDotsSlash(canonical, dots))
return null;
slash = true;
dots = 0;
break;
case '.':
// Count dots only if they are leading in the segment
if (dots > 0)
dots++;
else if (slash)
dots = 1;
else
canonical.append('.');
slash = false;
break;
default:
// Add leading dots to the path
while (dots-- > 0)
canonical.append('.');
canonical.append(c);
dots = 0;
slash = false;
}
i++;
}
// process any remaining dots
if (doDots(canonical, dots))
return null;
return canonical.toString();
}
private static boolean doDots(StringBuilder canonical, int dots)
{
switch (dots)