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source: vbox/trunk/src/libs/xpcom18a4/xpcom/io/nsEscape.cpp@ 44770

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1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2/* ***** BEGIN LICENSE BLOCK *****
3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 *
5 * The contents of this file are subject to the Mozilla Public License Version
6 * 1.1 (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 * http://www.mozilla.org/MPL/
9 *
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
13 * License.
14 *
15 * The Original Code is mozilla.org code.
16 *
17 * The Initial Developer of the Original Code is
18 * Netscape Communications Corporation.
19 * Portions created by the Initial Developer are Copyright (C) 1998
20 * the Initial Developer. All Rights Reserved.
21 *
22 * Contributor(s):
23 *
24 * Alternatively, the contents of this file may be used under the terms of
25 * either of the GNU General Public License Version 2 or later (the "GPL"),
26 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 * in which case the provisions of the GPL or the LGPL are applicable instead
28 * of those above. If you wish to allow use of your version of this file only
29 * under the terms of either the GPL or the LGPL, and not to allow others to
30 * use your version of this file under the terms of the MPL, indicate your
31 * decision by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL or the LGPL. If you do not delete
33 * the provisions above, a recipient may use your version of this file under
34 * the terms of any one of the MPL, the GPL or the LGPL.
35 *
36 * ***** END LICENSE BLOCK ***** */
37
38// First checked in on 98/12/03 by John R. McMullen, derived from net.h/mkparse.c.
39
40#include "nsEscape.h"
41#include "nsMemory.h"
42#include "nsCRT.h"
43#include "nsReadableUtils.h"
44
45const int netCharType[256] =
46/* Bit 0 xalpha -- the alphas
47** Bit 1 xpalpha -- as xalpha but
48** converts spaces to plus and plus to %2B
49** Bit 3 ... path -- as xalphas but doesn't escape '/'
50*/
51 /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
52 { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x */
53 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1x */
54 0,0,0,0,0,0,0,0,0,0,7,4,0,7,7,4, /* 2x !"#$%&'()*+,-./ */
55 7,7,7,7,7,7,7,7,7,7,0,0,0,0,0,0, /* 3x 0123456789:;<=>? */
56 0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, /* 4x @ABCDEFGHIJKLMNO */
57 /* bits for '@' changed from 7 to 0 so '@' can be escaped */
58 /* in usernames and passwords in publishing. */
59 7,7,7,7,7,7,7,7,7,7,7,0,0,0,0,7, /* 5X PQRSTUVWXYZ[\]^_ */
60 0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, /* 6x `abcdefghijklmno */
61 7,7,7,7,7,7,7,7,7,7,7,0,0,0,0,0, /* 7X pqrstuvwxyz{\}~ DEL */
62 0, };
63
64/* decode % escaped hex codes into character values
65 */
66#define UNHEX(C) \
67 ((C >= '0' && C <= '9') ? C - '0' : \
68 ((C >= 'A' && C <= 'F') ? C - 'A' + 10 : \
69 ((C >= 'a' && C <= 'f') ? C - 'a' + 10 : 0)))
70
71
72#define IS_OK(C) (netCharType[((unsigned int) (C))] & (mask))
73#define HEX_ESCAPE '%'
74
75//----------------------------------------------------------------------------------------
76static char* nsEscapeCount(
77 const char * str,
78 PRInt32 len,
79 nsEscapeMask mask,
80 PRInt32* out_len)
81//----------------------------------------------------------------------------------------
82{
83 if (!str)
84 return 0;
85
86 int i, extra = 0;
87 static const char hexChars[] = "0123456789ABCDEF";
88
89 register const unsigned char* src = (const unsigned char *) str;
90 for (i = 0; i < len; i++)
91 {
92 if (!IS_OK(*src++))
93 extra += 2; /* the escape, plus an extra byte for each nibble */
94 }
95
96 char* result = (char *)nsMemory::Alloc(len + extra + 1);
97 if (!result)
98 return 0;
99
100 register unsigned char* dst = (unsigned char *) result;
101 src = (const unsigned char *) str;
102 if (mask == url_XPAlphas)
103 {
104 for (i = 0; i < len; i++)
105 {
106 unsigned char c = *src++;
107 if (IS_OK(c))
108 *dst++ = c;
109 else if (c == ' ')
110 *dst++ = '+'; /* convert spaces to pluses */
111 else
112 {
113 *dst++ = HEX_ESCAPE;
114 *dst++ = hexChars[c >> 4]; /* high nibble */
115 *dst++ = hexChars[c & 0x0f]; /* low nibble */
116 }
117 }
118 }
119 else
120 {
121 for (i = 0; i < len; i++)
122 {
123 unsigned char c = *src++;
124 if (IS_OK(c))
125 *dst++ = c;
126 else
127 {
128 *dst++ = HEX_ESCAPE;
129 *dst++ = hexChars[c >> 4]; /* high nibble */
130 *dst++ = hexChars[c & 0x0f]; /* low nibble */
131 }
132 }
133 }
134
135 *dst = '\0'; /* tack on eos */
136 if(out_len)
137 *out_len = dst - (unsigned char *) result;
138 return result;
139}
140
141//----------------------------------------------------------------------------------------
142NS_COM char* nsEscape(const char * str, nsEscapeMask mask)
143//----------------------------------------------------------------------------------------
144{
145 if(!str)
146 return NULL;
147 return nsEscapeCount(str, (PRInt32)strlen(str), mask, NULL);
148}
149
150//----------------------------------------------------------------------------------------
151NS_COM char* nsUnescape(char * str)
152//----------------------------------------------------------------------------------------
153{
154 nsUnescapeCount(str);
155 return str;
156}
157
158//----------------------------------------------------------------------------------------
159NS_COM PRInt32 nsUnescapeCount(char * str)
160//----------------------------------------------------------------------------------------
161{
162 register char *src = str;
163 register char *dst = str;
164 static const char hexChars[] = "0123456789ABCDEFabcdef";
165
166 char c1[] = " ";
167 char c2[] = " ";
168 char* const pc1 = c1;
169 char* const pc2 = c2;
170
171 while (*src)
172 {
173 c1[0] = *(src+1);
174 if (*(src+1) == '\0')
175 c2[0] = '\0';
176 else
177 c2[0] = *(src+2);
178
179 if (*src != HEX_ESCAPE || PL_strpbrk(pc1, hexChars) == 0 ||
180 PL_strpbrk(pc2, hexChars) == 0 )
181 *dst++ = *src++;
182 else
183 {
184 src++; /* walk over escape */
185 if (*src)
186 {
187 *dst = UNHEX(*src) << 4;
188 src++;
189 }
190 if (*src)
191 {
192 *dst = (*dst + UNHEX(*src));
193 src++;
194 }
195 dst++;
196 }
197 }
198
199 *dst = 0;
200 return (int)(dst - str);
201
202} /* NET_UnEscapeCnt */
203
204
205NS_COM char *
206nsEscapeHTML(const char * string)
207{
208 /* XXX Hardcoded max entity len. The +1 is for the trailing null. */
209 char *rv = (char *) nsMemory::Alloc(strlen(string) * 6 + 1);
210 char *ptr = rv;
211
212 if(rv)
213 {
214 for(; *string != '\0'; string++)
215 {
216 if(*string == '<')
217 {
218 *ptr++ = '&';
219 *ptr++ = 'l';
220 *ptr++ = 't';
221 *ptr++ = ';';
222 }
223 else if(*string == '>')
224 {
225 *ptr++ = '&';
226 *ptr++ = 'g';
227 *ptr++ = 't';
228 *ptr++ = ';';
229 }
230 else if(*string == '&')
231 {
232 *ptr++ = '&';
233 *ptr++ = 'a';
234 *ptr++ = 'm';
235 *ptr++ = 'p';
236 *ptr++ = ';';
237 }
238 else if (*string == '"')
239 {
240 *ptr++ = '&';
241 *ptr++ = 'q';
242 *ptr++ = 'u';
243 *ptr++ = 'o';
244 *ptr++ = 't';
245 *ptr++ = ';';
246 }
247 else if (*string == '\'')
248 {
249 *ptr++ = '&';
250 *ptr++ = '#';
251 *ptr++ = '3';
252 *ptr++ = '9';
253 *ptr++ = ';';
254 }
255 else
256 {
257 *ptr++ = *string;
258 }
259 }
260 *ptr = '\0';
261 }
262
263 return(rv);
264}
265
266NS_COM PRUnichar *
267nsEscapeHTML2(const PRUnichar *aSourceBuffer, PRInt32 aSourceBufferLen)
268{
269 // if the caller didn't calculate the length
270 if (aSourceBufferLen == -1) {
271 aSourceBufferLen = nsCRT::strlen(aSourceBuffer); // ...then I will
272 }
273
274 /* XXX Hardcoded max entity len. */
275 PRUnichar *resultBuffer = (PRUnichar *)nsMemory::Alloc(aSourceBufferLen *
276 6 * sizeof(PRUnichar) + sizeof(PRUnichar('\0')));
277 PRUnichar *ptr = resultBuffer;
278
279 if (resultBuffer) {
280 PRInt32 i;
281
282 for(i = 0; i < aSourceBufferLen; i++) {
283 if(aSourceBuffer[i] == '<') {
284 *ptr++ = '&';
285 *ptr++ = 'l';
286 *ptr++ = 't';
287 *ptr++ = ';';
288 } else if(aSourceBuffer[i] == '>') {
289 *ptr++ = '&';
290 *ptr++ = 'g';
291 *ptr++ = 't';
292 *ptr++ = ';';
293 } else if(aSourceBuffer[i] == '&') {
294 *ptr++ = '&';
295 *ptr++ = 'a';
296 *ptr++ = 'm';
297 *ptr++ = 'p';
298 *ptr++ = ';';
299 } else if (aSourceBuffer[i] == '"') {
300 *ptr++ = '&';
301 *ptr++ = 'q';
302 *ptr++ = 'u';
303 *ptr++ = 'o';
304 *ptr++ = 't';
305 *ptr++ = ';';
306 } else if (aSourceBuffer[i] == '\'') {
307 *ptr++ = '&';
308 *ptr++ = '#';
309 *ptr++ = '3';
310 *ptr++ = '9';
311 *ptr++ = ';';
312 } else {
313 *ptr++ = aSourceBuffer[i];
314 }
315 }
316 *ptr = 0;
317 }
318
319 return resultBuffer;
320}
321
322//----------------------------------------------------------------------------------------
323
324const int EscapeChars[256] =
325/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
326{
327 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
328 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
329 0,1023, 0, 512,1023, 0,1023,1023,1023,1023,1023,1023,1023,1023, 953, 784, /* 2x !"#$%&'()*+,-./ */
330 1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1008, 912, 0,1008, 0, 768, /* 3x 0123456789:;<=>? */
331 1008,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023, /* 4x @ABCDEFGHIJKLMNO */
332 1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023, 896, 896, 896, 896,1023, /* 5x PQRSTUVWXYZ[\]^_ */
333 0,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023, /* 6x `abcdefghijklmno */
334 1023,1023,1023,1023,1023,1023,1023,1023,1023,1023,1023, 896,1012, 896,1023, 0, /* 7x pqrstuvwxyz{|}~ */
335 0 /* 8x DEL */
336};
337
338#define NO_NEED_ESC(C) (EscapeChars[((unsigned int) (C))] & (mask))
339
340//----------------------------------------------------------------------------------------
341
342/* returns an escaped string */
343
344/* use the following masks to specify which
345 part of an URL you want to escape:
346
347 esc_Scheme = 1
348 esc_Username = 2
349 esc_Password = 4
350 esc_Host = 8
351 esc_Directory = 16
352 esc_FileBaseName = 32
353 esc_FileExtension = 64
354 esc_Param = 128
355 esc_Query = 256
356 esc_Ref = 512
357*/
358
359/* by default this function will not escape parts of a string
360 that already look escaped, which means it already includes
361 a valid hexcode. This is done to avoid multiple escapes of
362 a string. Use the following mask to force escaping of a
363 string:
364
365 esc_Forced = 1024
366*/
367
368NS_COM PRBool NS_EscapeURL(const char *part,
369 PRInt32 partLen,
370 PRInt16 mask,
371 nsACString &result)
372{
373 if (!part) {
374 NS_NOTREACHED("null pointer");
375 return PR_FALSE;
376 }
377
378 int i = 0;
379 static const char hexChars[] = "0123456789ABCDEF";
380 if (partLen < 0)
381 partLen = strlen(part);
382 PRBool forced = (mask & esc_Forced);
383 PRBool ignoreNonAscii = (mask & esc_OnlyASCII);
384 PRBool ignoreAscii = (mask & esc_OnlyNonASCII);
385 PRBool writing = (mask & esc_AlwaysCopy);
386 PRBool colon = (mask & esc_Colon);
387
388 register const unsigned char* src = (const unsigned char *) part;
389
390 char tempBuffer[100];
391 unsigned int tempBufferPos = 0;
392
393 for (i = 0; i < partLen; i++)
394 {
395 unsigned char c = *src++;
396
397 // if the char has not to be escaped or whatever follows % is
398 // a valid escaped string, just copy the char.
399 //
400 // Also the % will not be escaped until forced
401 // See bugzilla bug 61269 for details why we changed this
402 //
403 // And, we will not escape non-ascii characters if requested.
404 // On special request we will also escape the colon even when
405 // not covered by the matrix.
406 // ignoreAscii is not honored for control characters (C0 and DEL)
407 if ((NO_NEED_ESC(c) || (c == HEX_ESCAPE && !forced)
408 || (c > 0x7f && ignoreNonAscii)
409 || (c > 0x1f && c < 0x7f && ignoreAscii))
410 && !(c == ':' && colon))
411 {
412 if (writing)
413 tempBuffer[tempBufferPos++] = c;
414 }
415 else /* do the escape magic */
416 {
417 if (!writing)
418 {
419 result.Append(part, i);
420 writing = PR_TRUE;
421 }
422 tempBuffer[tempBufferPos++] = HEX_ESCAPE;
423 tempBuffer[tempBufferPos++] = hexChars[c >> 4]; /* high nibble */
424 tempBuffer[tempBufferPos++] = hexChars[c & 0x0f]; /* low nibble */
425 }
426
427 if (tempBufferPos >= sizeof(tempBuffer) - 4)
428 {
429 NS_ASSERTION(writing, "should be writing");
430 tempBuffer[tempBufferPos] = '\0';
431 result += tempBuffer;
432 tempBufferPos = 0;
433 }
434 }
435 if (writing) {
436 tempBuffer[tempBufferPos] = '\0';
437 result += tempBuffer;
438 }
439 return writing;
440}
441
442#define ISHEX(c) memchr(hexChars, c, sizeof(hexChars)-1)
443
444NS_COM PRBool NS_UnescapeURL(const char *str, PRInt32 len, PRInt16 flags, nsACString &result)
445{
446 if (!str) {
447 NS_NOTREACHED("null pointer");
448 return PR_FALSE;
449 }
450
451 if (len < 0)
452 len = strlen(str);
453
454 PRBool ignoreNonAscii = (flags & esc_OnlyASCII);
455 PRBool writing = (flags & esc_AlwaysCopy);
456 PRBool skipControl = (flags & esc_SkipControl);
457
458 static const char hexChars[] = "0123456789ABCDEFabcdef";
459
460 const char *last = str;
461 const char *p = str;
462
463 for (int i=0; i<len; ++i, ++p) {
464 //printf("%c [i=%d of len=%d]\n", *p, i, len);
465 if (*p == HEX_ESCAPE && i < len-2) {
466 unsigned char *p1 = ((unsigned char *) p) + 1;
467 unsigned char *p2 = ((unsigned char *) p) + 2;
468 if (ISHEX(*p1) && ISHEX(*p2) && !(ignoreNonAscii && *p1 >= '8') &&
469 !(skipControl &&
470 (*p1 < '2' || (*p1 == '7' && (*p2 == 'f' || *p2 == 'F'))))) {
471 //printf("- p1=%c p2=%c\n", *p1, *p2);
472 writing = PR_TRUE;
473 if (p > last) {
474 //printf("- p=%p, last=%p\n", p, last);
475 result.Append(last, p - last);
476 last = p;
477 }
478 char u = (UNHEX(*p1) << 4) + UNHEX(*p2);
479 //printf("- u=%c\n", u);
480 result.Append(u);
481 i += 2;
482 p += 2;
483 last += 3;
484 }
485 }
486 }
487 if (writing && last < str + len)
488 result.Append(last, str + len - last);
489
490 return writing;
491}
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