netsurf/utils/url.c

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/*
* Copyright 2006 Richard Wilson <info@tinct.net>
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2005 John M Bell <jmb202@ecs.soton.ac.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* \brief Implementation of URL parsing and joining operations.
*/
#include <ctype.h>
#include <string.h>
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#include <curl/curl.h>
#include "utils/config.h"
#include "utils/log.h"
#include "utils/utils.h"
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#include "utils/url.h"
/* exported interface documented in utils/url.h */
nserror url_unescape(const char *str, char **result)
{
char *curlstr;
char *retstr;
curlstr = curl_unescape(str, 0);
if (curlstr == NULL) {
return NSERROR_NOMEM;
}
retstr = strdup(curlstr);
curl_free(curlstr);
if (retstr == NULL) {
return NSERROR_NOMEM;
}
*result = retstr;
return NSERROR_OK;
}
/* exported interface documented in utils/url.h */
nserror url_escape(const char *unescaped, size_t toskip,
bool sptoplus, const char *escexceptions, char **result)
{
size_t len;
char *escaped, *d, *tmpres;
const char *c;
if (!unescaped || !result)
return NSERROR_NOT_FOUND;
*result = NULL;
len = strlen(unescaped);
if (len < toskip)
return NSERROR_NOT_FOUND;
len -= toskip;
escaped = malloc(len * 3 + 1);
if (!escaped)
return NSERROR_NOMEM;
for (c = unescaped + toskip, d = escaped; *c; c++) {
/* Check if we should escape this byte.
* '~' is unreserved and should not be percent encoded, if
* you believe the spec; however, leaving it unescaped
* breaks a bunch of websites, so we escape it anyway. */
if (!isascii(*c)
|| (strchr(":/?#[]@" /* gen-delims */
"!$&'()*+,;=" /* sub-delims */
"<>%\"{}|\\^`~" /* others */, *c)
&& (!escexceptions || !strchr(escexceptions, *c)))
|| *c <= 0x20 || *c == 0x7f) {
if (*c == 0x20 && sptoplus) {
*d++ = '+';
} else {
*d++ = '%';
*d++ = "0123456789ABCDEF"[((*c >> 4) & 0xf)];
*d++ = "0123456789ABCDEF"[(*c & 0xf)];
}
} else {
/* unreserved characters: [a-zA-Z0-9-._] */
*d++ = *c;
}
}
*d++ = '\0';
tmpres = malloc(d - escaped + toskip);
if (!tmpres) {
free(escaped);
return NSERROR_NOMEM;
}
memcpy(tmpres, unescaped, toskip);
memcpy(tmpres + toskip, escaped, d - escaped);
*result = tmpres;
free(escaped);
return NSERROR_OK;
}