]>
git.ipfire.org Git - thirdparty/squid.git/blob - lib/rfc1738.c
2 * $Id: rfc1738.c,v 1.28 2007/12/06 02:37:15 amosjeffries Exp $
5 * AUTHOR: Harvest Derived
7 * SQUID Web Proxy Cache http://www.squid-cache.org/
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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.
47 * RFC 1738 defines that these characters should be escaped, as well
48 * any non-US-ASCII character or anything between 0x00 - 0x1F.
50 static char rfc1738_unsafe_chars
[] =
56 #if 0 /* done in code */
69 (char) 0x20 /* space */
72 static char rfc1738_reserved_chars
[] =
84 * rfc1738_escape - Returns a static buffer contains the RFC 1738
85 * compliant, escaped version of the given url.
88 rfc1738_do_escape(const char *url
, int encode_reserved
)
91 static size_t bufsize
= 0;
94 unsigned int i
, do_escape
;
96 if (buf
== NULL
|| strlen(url
) * 3 > bufsize
) {
98 bufsize
= strlen(url
) * 3 + 1;
99 buf
= xcalloc(bufsize
, 1);
101 for (p
= url
, q
= buf
; *p
!= '\0' && q
< (buf
+ bufsize
- 1); p
++, q
++) {
104 /* RFC 1738 defines these chars as unsafe */
105 for (i
= 0; i
< sizeof(rfc1738_unsafe_chars
); i
++) {
106 if (*p
== rfc1738_unsafe_chars
[i
]) {
111 /* Handle % separately */
112 if (encode_reserved
>= 0 && *p
== '%')
114 /* RFC 1738 defines these chars as reserved */
115 for (i
= 0; i
< sizeof(rfc1738_reserved_chars
) && encode_reserved
> 0; i
++) {
116 if (*p
== rfc1738_reserved_chars
[i
]) {
121 /* RFC 1738 says any control chars (0x00-0x1F) are encoded */
122 if ((unsigned char) *p
<= (unsigned char) 0x1F) {
125 /* RFC 1738 says 0x7f is encoded */
126 if (*p
== (char) 0x7F) {
129 /* RFC 1738 says any non-US-ASCII are encoded */
130 if (((unsigned char) *p
>= (unsigned char) 0x80)) {
133 /* Do the triplet encoding, or just copy the char */
134 /* note: we do not need snprintf here as q is appropriately
137 if (do_escape
== 1) {
138 (void) sprintf(q
, "%%%02X", (unsigned char) *p
);
139 q
+= sizeof(char) * 2;
149 * rfc1738_escape - Returns a static buffer that contains the RFC
150 * 1738 compliant, escaped version of the given url.
153 rfc1738_escape(const char *url
)
155 return rfc1738_do_escape(url
, 0);
159 * rfc1738_escape_unescaped - Returns a static buffer that contains
160 * the RFC 1738 compliant, escaped version of the given url.
163 rfc1738_escape_unescaped(const char *url
)
165 return rfc1738_do_escape(url
, -1);
169 * rfc1738_escape_part - Returns a static buffer that contains the
170 * RFC 1738 compliant, escaped version of the given url segment.
173 rfc1738_escape_part(const char *url
)
175 return rfc1738_do_escape(url
, 1);
179 * rfc1738_unescape() - Converts escaped characters (%xy numbers) in
180 * given the string. %% is a %. %ab is the 8-bit hexadecimal number "ab"
183 rfc1738_unescape(char *s
)
186 int i
, j
; /* i is write, j is read */
188 for (i
= j
= 0; s
[j
]; i
++, j
++) {
192 if (s
[j
+ 1] == '%') { /* %% case */
196 if (s
[j
+ 1] && s
[j
+ 2]) {
197 if (s
[j
+ 1] == '0' && s
[j
+ 2] == '0') { /* %00 case */
201 hexnum
[0] = s
[j
+ 1];
202 hexnum
[1] = s
[j
+ 2];
204 if (1 == sscanf(hexnum
, "%x", &x
)) {
205 s
[i
] = (char) (0x0ff & x
);