]>
git.ipfire.org Git - thirdparty/squid.git/blob - lib/rfc1738.c
2 * $Id: rfc1738.c,v 1.24 2003/01/23 00:37:01 robertc Exp $
5 * AUTHOR: Harvest Derived
7 * SQUID Web Proxy Cache http://www.squid-cache.org/
8 * ----------------------------------------------------------
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19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
48 * RFC 1738 defines that these characters should be escaped, as well
49 * any non-US-ASCII character or anything between 0x00 - 0x1F.
51 static char rfc1738_unsafe_chars
[] =
57 #if 0 /* done in code */
70 (char) 0x20 /* space */
73 static char rfc1738_reserved_chars
[] =
85 * rfc1738_escape - Returns a static buffer contains the RFC 1738
86 * compliant, escaped version of the given url.
89 rfc1738_do_escape(const char *url
, int encode_reserved
)
92 static size_t bufsize
= 0;
95 unsigned int i
, do_escape
;
97 if (buf
== NULL
|| strlen(url
) * 3 > bufsize
) {
99 bufsize
= strlen(url
) * 3 + 1;
100 buf
= xcalloc(bufsize
, 1);
102 for (p
= url
, q
= buf
; *p
!= '\0'; p
++, q
++) {
105 /* RFC 1738 defines these chars as unsafe */
106 for (i
= 0; i
< sizeof(rfc1738_unsafe_chars
); i
++) {
107 if (*p
== rfc1738_unsafe_chars
[i
]) {
112 /* Handle % separately */
113 if (encode_reserved
>= 0 && *p
== '%')
115 /* RFC 1738 defines these chars as reserved */
116 for (i
= 0; i
< sizeof(rfc1738_reserved_chars
) && encode_reserved
> 0; i
++) {
117 if (*p
== rfc1738_reserved_chars
[i
]) {
122 /* RFC 1738 says any control chars (0x00-0x1F) are encoded */
123 if ((unsigned char) *p
<= (unsigned char) 0x1F) {
126 /* RFC 1738 says 0x7f is encoded */
127 if (*p
== (char) 0x7F) {
130 /* RFC 1738 says any non-US-ASCII are encoded */
131 if (((unsigned char) *p
>= (unsigned char) 0x80) &&
132 ((unsigned char) *p
<= (unsigned char) 0xFF)) {
135 /* Do the triplet encoding, or just copy the char */
136 /* note: we do not need snprintf here as q is appropriately
139 if (do_escape
== 1) {
140 (void) sprintf(q
, "%%%02x", (unsigned char) *p
);
141 q
+= sizeof(char) * 2;
151 * rfc1738_escape - Returns a static buffer that contains the RFC
152 * 1738 compliant, escaped version of the given url.
155 rfc1738_escape(const char *url
)
157 return rfc1738_do_escape(url
, 0);
161 * rfc1738_escape_unescaped - Returns a static buffer that contains
162 * the RFC 1738 compliant, escaped version of the given url.
165 rfc1738_escape_unescaped(const char *url
)
167 return rfc1738_do_escape(url
, -1);
171 * rfc1738_escape_part - Returns a static buffer that contains the
172 * RFC 1738 compliant, escaped version of the given url segment.
175 rfc1738_escape_part(const char *url
)
177 return rfc1738_do_escape(url
, 1);
181 * rfc1738_unescape() - Converts escaped characters (%xy numbers) in
182 * given the string. %% is a %. %ab is the 8-bit hexadecimal number "ab"
185 rfc1738_unescape(char *s
)
188 int i
, j
; /* i is write, j is read */
190 for (i
= j
= 0; s
[j
]; i
++, j
++) {
194 if (s
[j
+ 1] == '%') { /* %% case */
198 if (s
[j
+ 1] && s
[j
+ 2]) {
199 hexnum
[0] = s
[j
+ 1];
200 hexnum
[1] = s
[j
+ 2];
202 if (1 == sscanf(hexnum
, "%x", &x
)) {
203 s
[i
] = (char) (0x0ff & x
);