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/* media_params.c
* Routines for parsing media type parameters
* Copyright 2004, Anders Broman.
* Copyright 2004, Olivier Biot.
*
* Refer to the AUTHORS file or the AUTHORS section in the man page
* for contacting the author(s) of this file.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program 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; either version 2
* of the License, or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <string.h>
#include <glib.h>
#include <epan/media_params.h>
/* Return the index of a given char in the given string,
* or -1 if not found.
*/
gint
index_of_char(const char *str, const char c)
{
gint len = 0;
const char *p = str;
while (*p && *p != c) {
p++;
len++;
}
if (*p)
return len;
return -1;
}
char *
find_parameter(const char *parameters, const char *key, int *retlen)
{
const char *start, *p;
int keylen = 0;
int len = 0;
if(!parameters || !*parameters || !key || strlen(key) == 0)
/* we won't be able to find anything */
return NULL;
keylen = (int) strlen(key);
p = parameters;
while (*p) {
while ((*p) && g_ascii_isspace(*p))
p++; /* Skip white space */
if (g_ascii_strncasecmp(p, key, keylen) == 0)
break;
/* Skip to next parameter */
p = strchr(p, ';');
if (p == NULL)
{
return NULL;
}
p++; /* Skip semicolon */
}
if (*p == 0x0)
return NULL; /* key wasn't found */
start = p + keylen;
if (start[0] == 0) {
return NULL;
}
/*
* Process the parameter value
*/
if (start[0] == '"') {
/*
* Parameter value is a quoted-string
*/
start++; /* Skip the quote */
len = index_of_char(start, '"');
if (len < 0) {
/*
* No closing quote
*/
return NULL;
}
} else {
/*
* Look for end of boundary
*/
p = start;
while (*p) {
if (*p == ';' || g_ascii_isspace(*p))
break;
p++;
len++;
}
}
if(retlen)
(*retlen) = len;
/*
* This is one of those ugly routines like strchr() where you can
* pass in a constant or non-constant string, and the result
* points into that string and inherits the constness of the
* input argument, but C doesn't support that, so the input
* parameter is const char * and the result is char *.
*/
return (char *)start;
}
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