forked from mozilla/gecko-dev
-
Notifications
You must be signed in to change notification settings - Fork 2
/
nsWildCard.cpp
471 lines (436 loc) · 14.4 KB
/
nsWildCard.cpp
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
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sts=4 sw=4 cin et: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* *
*
*
* nsWildCard.cpp: shell-like wildcard match routines
*
* See nsIZipReader.findEntries documentation in nsIZipReader.idl for
* a description of the syntax supported by the routines in this file.
*
* Rob McCool
*
*/
#include "nsWildCard.h"
#include "nsXPCOM.h"
#include "nsCRTGlue.h"
#include "nsCharTraits.h"
/* -------------------- ASCII-specific character methods ------------------- */
typedef int static_assert_character_code_arrangement['a' > 'A' ? 1 : -1];
template<class T>
static int
alpha(T c)
{
return ('a' <= c && c <= 'z') ||
('A' <= c && c <= 'Z');
}
template<class T>
static int
alphanumeric(T c)
{
return ('0' <= c && c <= '9') || ::alpha(c);
}
template<class T>
static int
lower(T c)
{
return ('A' <= c && c <= 'Z') ? c + ('a' - 'A') : c;
}
template<class T>
static int
upper(T c)
{
return ('a' <= c && c <= 'z') ? c - ('a' - 'A') : c;
}
/* ----------------------------- _valid_subexp ---------------------------- */
template<class T>
static int
_valid_subexp(const T *expr, T stop1, T stop2)
{
register int x;
int nsc = 0; /* Number of special characters */
int np; /* Number of pipe characters in union */
int tld = 0; /* Number of tilde characters */
for (x = 0; expr[x] && (expr[x] != stop1) && (expr[x] != stop2); ++x) {
switch(expr[x]) {
case '~':
if(tld) /* at most one exclusion */
return INVALID_SXP;
if (stop1) /* no exclusions within unions */
return INVALID_SXP;
if (!expr[x+1]) /* exclusion cannot be last character */
return INVALID_SXP;
if (!x) /* exclusion cannot be first character */
return INVALID_SXP;
++tld;
/* fall through */
case '*':
case '?':
case '$':
++nsc;
break;
case '[':
++nsc;
if((!expr[++x]) || (expr[x] == ']'))
return INVALID_SXP;
for(; expr[x] && (expr[x] != ']'); ++x) {
if(expr[x] == '\\' && !expr[++x])
return INVALID_SXP;
}
if(!expr[x])
return INVALID_SXP;
break;
case '(':
++nsc;
if (stop1) /* no nested unions */
return INVALID_SXP;
np = -1;
do {
int t = ::_valid_subexp(&expr[++x], T(')'), T('|'));
if(t == 0 || t == INVALID_SXP)
return INVALID_SXP;
x+=t;
if(!expr[x])
return INVALID_SXP;
++np;
} while (expr[x] == '|' );
if(np < 1) /* must be at least one pipe */
return INVALID_SXP;
break;
case ')':
case ']':
case '|':
return INVALID_SXP;
case '\\':
++nsc;
if(!expr[++x])
return INVALID_SXP;
break;
default:
break;
}
}
if((!stop1) && (!nsc)) /* must be at least one special character */
return NON_SXP;
return ((expr[x] == stop1 || expr[x] == stop2) ? x : INVALID_SXP);
}
template<class T>
int
NS_WildCardValid_(const T *expr)
{
int x = ::_valid_subexp(expr, T('\0'), T('\0'));
return (x < 0 ? x : VALID_SXP);
}
NS_COM int
NS_WildCardValid(const char *expr)
{
return NS_WildCardValid_(expr);
}
NS_COM int
NS_WildCardValid(const PRUnichar *expr)
{
return NS_WildCardValid_(expr);
}
/* ----------------------------- _shexp_match ----------------------------- */
#define MATCH 0
#define NOMATCH 1
#define ABORTED -1
template<class T>
static int
_shexp_match(const T *str, const T *expr, PRBool case_insensitive, unsigned int level);
/**
* Count characters until we reach a NUL character or either of the
* two delimiter characters, stop1 or stop2. If we encounter a bracketed
* expression, look only for NUL or ']' inside it. Do not look for stop1
* or stop2 inside it. Return ABORTED if bracketed expression is unterminated.
* Handle all escaping.
* Return index in input string of first stop found, or ABORTED if not found.
* If "dest" is non-NULL, copy counted characters to it and NUL terminate.
*/
template<class T>
static int
_scan_and_copy(const T *expr, T stop1, T stop2, T *dest)
{
register int sx; /* source index */
register T cc;
for (sx = 0; (cc = expr[sx]) && cc != stop1 && cc != stop2; sx++) {
if (cc == '\\') {
if (!expr[++sx])
return ABORTED; /* should be impossible */
}
else if (cc == '[') {
while ((cc = expr[++sx]) && cc != ']') {
if(cc == '\\' && !expr[++sx])
return ABORTED;
}
if (!cc)
return ABORTED; /* should be impossible */
}
}
if (dest && sx) {
/* Copy all but the closing delimiter. */
memcpy(dest, expr, sx * sizeof(T));
dest[sx] = 0;
}
return cc ? sx : ABORTED; /* index of closing delimiter */
}
/* On input, expr[0] is the opening parenthesis of a union.
* See if any of the alternatives in the union matches as a pattern.
* The strategy is to take each of the alternatives, in turn, and append
* the rest of the expression (after the closing ')' that marks the end of
* this union) to that alternative, and then see if the resultant expression
* matches the input string. Repeat this until some alternative matches,
* or we have an abort.
*/
template<class T>
static int
_handle_union(const T *str, const T *expr, PRBool case_insensitive,
unsigned int level)
{
register int sx; /* source index */
int cp; /* source index of closing parenthesis */
int count;
int ret = NOMATCH;
T *e2;
/* Find the closing parenthesis that ends this union in the expression */
cp = ::_scan_and_copy(expr, T(')'), T('\0'), static_cast<T*>(NULL));
if (cp == ABORTED || cp < 4) /* must be at least "(a|b" before ')' */
return ABORTED;
++cp; /* now index of char after closing parenthesis */
e2 = (T *) NS_Alloc((1 + nsCharTraits<T>::length(expr)) * sizeof(T));
if (!e2)
return ABORTED;
for (sx = 1; ; ++sx) {
/* Here, expr[sx] is one character past the preceding '(' or '|'. */
/* Copy everything up to the next delimiter to e2 */
count = ::_scan_and_copy(expr + sx, T(')'), T('|'), e2);
if (count == ABORTED || !count) {
ret = ABORTED;
break;
}
sx += count;
/* Append everything after closing parenthesis to e2. This is safe. */
nsCharTraits<T>::copy(e2 + count, expr + cp, nsCharTraits<T>::length(expr + cp) + 1);
ret = ::_shexp_match(str, e2, case_insensitive, level + 1);
if (ret != NOMATCH || !expr[sx] || expr[sx] == ')')
break;
}
NS_Free(e2);
if (sx < 2)
ret = ABORTED;
return ret;
}
/* returns 1 if val is in range from start..end, case insensitive. */
static int
_is_char_in_range(unsigned char start, unsigned char end, unsigned char val)
{
char map[256];
memset(map, 0, sizeof map);
while (start <= end)
map[lower(start++)] = 1;
return map[lower(val)];
}
template<class T>
static int
_shexp_match(const T *str, const T *expr, PRBool case_insensitive,
unsigned int level)
{
register int x; /* input string index */
register int y; /* expression index */
int ret,neg;
if (level > 20) /* Don't let the stack get too deep. */
return ABORTED;
for(x = 0, y = 0; expr[y]; ++y, ++x) {
if((!str[x]) && (expr[y] != '$') && (expr[y] != '*')) {
return NOMATCH;
}
switch(expr[y]) {
case '$':
if(str[x])
return NOMATCH;
--x; /* we don't want loop to increment x */
break;
case '*':
while(expr[++y] == '*'){}
if(!expr[y])
return MATCH;
while(str[x]) {
ret = ::_shexp_match(&str[x++], &expr[y], case_insensitive,
level + 1);
switch(ret) {
case NOMATCH:
continue;
case ABORTED:
return ABORTED;
default:
return MATCH;
}
}
if((expr[y] == '$') && (expr[y+1] == '\0') && (!str[x]))
return MATCH;
else
return NOMATCH;
case '[': {
T start, end = 0;
int i;
neg = ((expr[++y] == '^') && (expr[y+1] != ']'));
if (neg)
++y;
i = y;
start = expr[i++];
if (start == '\\')
start = expr[i++];
if (::alphanumeric(start) && expr[i++] == '-') {
end = expr[i++];
if (end == '\\')
end = expr[i++];
}
if (::alphanumeric(end) && expr[i] == ']') {
/* This is a range form: a-b */
T val = str[x];
if (end < start) { /* swap them */
T tmp = end;
end = start;
start = tmp;
}
if (case_insensitive && ::alpha(val)) {
val = ::_is_char_in_range((unsigned char) start,
(unsigned char) end,
(unsigned char) val);
if (neg == val)
return NOMATCH;
}
else if (neg != ((val < start) || (val > end))) {
return NOMATCH;
}
y = i;
}
else {
/* Not range form */
int matched = 0;
for (; expr[y] != ']'; y++) {
if (expr[y] == '\\')
++y;
if(case_insensitive)
matched |= (::upper(str[x]) == ::upper(expr[y]));
else
matched |= (str[x] == expr[y]);
}
if (neg == matched)
return NOMATCH;
}
}
break;
case '(':
if (!expr[y+1])
return ABORTED;
return ::_handle_union(&str[x], &expr[y], case_insensitive, level + 1);
case '?':
break;
case ')':
case ']':
case '|':
return ABORTED;
case '\\':
++y;
/* fall through */
default:
if(case_insensitive) {
if(::upper(str[x]) != ::upper(expr[y]))
return NOMATCH;
}
else {
if(str[x] != expr[y])
return NOMATCH;
}
break;
}
}
return (str[x] ? NOMATCH : MATCH);
}
template<class T>
static int
ns_WildCardMatch(const T *str, const T *xp, PRBool case_insensitive)
{
T *expr = NULL;
int x, ret = MATCH;
if (!nsCharTraits<T>::find(xp, nsCharTraits<T>::length(xp), T('~')))
return ::_shexp_match(str, xp, case_insensitive, 0);
expr = (T *) NS_Alloc((nsCharTraits<T>::length(xp) + 1) * sizeof(T));
if(!expr)
return NOMATCH;
memcpy(expr, xp, (nsCharTraits<T>::length(xp) + 1) * sizeof(T));
x = ::_scan_and_copy(expr, T('~'), T('\0'), static_cast<T*>(NULL));
if (x != ABORTED && expr[x] == '~') {
expr[x++] = '\0';
ret = ::_shexp_match(str, &expr[x], case_insensitive, 0);
switch (ret) {
case NOMATCH: ret = MATCH; break;
case MATCH: ret = NOMATCH; break;
default: break;
}
}
if (ret == MATCH)
ret = ::_shexp_match(str, expr, case_insensitive, 0);
NS_Free(expr);
return ret;
}
template<class T>
NS_COM int
NS_WildCardMatch_(const T *str, const T *expr, PRBool case_insensitive)
{
int is_valid = NS_WildCardValid(expr);
switch(is_valid) {
case INVALID_SXP:
return -1;
default:
return ::ns_WildCardMatch(str, expr, case_insensitive);
}
}
NS_COM int
NS_WildCardMatch(const char *str, const char *xp,
PRBool case_insensitive)
{
return NS_WildCardMatch_(str, xp, case_insensitive);
}
NS_COM int
NS_WildCardMatch(const PRUnichar *str, const PRUnichar *xp,
PRBool case_insensitive)
{
return NS_WildCardMatch_(str, xp, case_insensitive);
}