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/*
* $Id$
*
* Wireshark - Network traffic analyzer
*
* Copyright 2006 Gilbert Ramirez <gram@alumni.rice.edu>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include "dfunctions.h"
#include "dfilter-int.h"
#include <string.h>
#include <ctype.h>
#include <ftypes/ftypes.h>
#include <epan/exceptions.h>
#include <epan/emem.h>
/* lowercase an ASCII character.
* (thanks to Guy Harris for the function) */
static gchar
string_ascii_to_lower(gchar c)
{
return ((c & 0x80) ? c : tolower(c));
}
/* uppercase an ASCII character. */
static gchar
string_ascii_to_upper(gchar c)
{
return ((c & 0x80) ? c : toupper(c));
}
/* Convert an FT_STRING using a callback function */
static gboolean
string_walk(GList* arg1list, GList **retval, gchar(*conv_func)(gchar))
{
GList *arg1;
fvalue_t *arg_fvalue;
fvalue_t *new_ft_string;
char *s, *c;
arg1 = arg1list;
while (arg1) {
arg_fvalue = (fvalue_t *)arg1->data;
switch (fvalue_ftype(arg_fvalue)->ftype) {
case FT_STRING:
case FT_STRINGZ:
case FT_UINT_STRING:
s = (char *)ep_strdup(fvalue_get(arg_fvalue));
for (c = s; *c; c++) {
/**c = string_ascii_to_lower(*c);*/
*c = conv_func(*c);
}
new_ft_string = fvalue_new(FT_STRING);
fvalue_set(new_ft_string, s, FALSE);
*retval = g_list_append(*retval, new_ft_string);
break;
/* XXX - it would be nice to handle FT_TVBUFF, too */
default:
break;
}
arg1 = arg1->next;
}
return TRUE;
}
/* dfilter function: lower() */
static gboolean
df_func_lower(GList* arg1list, GList *arg2junk _U_, GList **retval)
{
return string_walk(arg1list, retval, string_ascii_to_lower);
}
/* dfilter function: upper() */
static gboolean
df_func_upper(GList* arg1list, GList *arg2junk _U_, GList **retval)
{
return string_walk(arg1list, retval, string_ascii_to_upper);
}
/* dfilter function: len() */
static gboolean
df_func_len(GList* arg1list, GList *arg2junk _U_, GList **retval)
{
GList *arg1;
fvalue_t *arg_fvalue;
fvalue_t *ft_len;
arg1 = arg1list;
while (arg1) {
arg_fvalue = (fvalue_t *)arg1->data;
switch (fvalue_ftype(arg_fvalue)->ftype) {
case FT_STRING:
case FT_STRINGZ:
case FT_UINT_STRING:
ft_len = fvalue_new(FT_UINT32);
fvalue_set_uinteger(ft_len, (guint) strlen(fvalue_get(arg_fvalue)));
*retval = g_list_append(*retval, ft_len);
break;
/* XXX - it would be nice to handle other types */
default:
break;
}
arg1 = arg1->next;
}
return TRUE;
}
/* For upper(), lower() and len(), checks that the parameter passed to
* it is an FT_STRING */
static void
ul_semcheck_params(int param_num, stnode_t *st_node)
{
sttype_id_t type;
ftenum_t ftype;
header_field_info *hfinfo;
type = stnode_type_id(st_node);
if (param_num == 0) {
switch(type) {
case STTYPE_FIELD:
hfinfo = (header_field_info *)stnode_data(st_node);
ftype = hfinfo->type;
if (ftype != FT_STRING && ftype != FT_STRINGZ
&& ftype != FT_UINT_STRING) {
dfilter_fail("Only strings can be used in upper() or lower() or len()");
THROW(TypeError);
}
break;
default:
dfilter_fail("Only string-type fields can be used in upper() or lower() or len()");
THROW(TypeError);
}
}
else {
g_assert_not_reached();
}
}
/* The table of all display-filter functions */
static df_func_def_t
df_functions[] = {
{ "lower", df_func_lower, FT_STRING, 1, 1, ul_semcheck_params },
{ "upper", df_func_upper, FT_STRING, 1, 1, ul_semcheck_params },
{ "len", df_func_len, FT_UINT32, 1, 1, ul_semcheck_params },
{ NULL, NULL, 0, 0, 0, NULL }
};
/* Lookup a display filter function record by name */
df_func_def_t*
df_func_lookup(char *name)
{
df_func_def_t *func_def;
func_def = df_functions;
while (func_def->function != NULL) {
if (strcmp(func_def->name, name) == 0) {
return func_def;
}
func_def++;
}
return NULL;
}
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