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/* packet-h221_nonstd.c
* Routines for H.221 nonstandard parameters disassembly
*
* $Id$
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
/* Define the nonstd proto */
static int proto_nonstd = -1;
/*
* Define the trees for nonstd
* We need one for nonstd itself and one for the nonstd paramters
*/
static int ett_nonstd = -1;
const value_string ms_codec_vals[] = {
{ 0x0111, "L&H CELP 4.8k" },
{ 0x0200, "MS-ADPCM" },
{ 0x0211, "L&H CELP 8k" },
{ 0x0311, "L&H CELP 12k" },
{ 0x0411, "L&H CELP 16k" },
{ 0x1100, "IMA-ADPCM" },
{ 0x3100, "MS-GSM" },
{ 0xfeff, "E-AMR" },
{ 0, NULL }
};
static void
dissect_ms_nonstd(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
{
proto_item *it;
proto_tree *tr;
guint32 offset=0;
gint tvb_len;
guint16 codec_value, codec_extra;
it=proto_tree_add_protocol_format(tree, proto_nonstd, tvb, 0, tvb_length(tvb), "Microsoft NonStd");
tr=proto_item_add_subtree(it, ett_nonstd);
tvb_len = tvb_length(tvb);
/*
* XXX - why do this test? Are there any cases where throwing
* an exception if the tvbuff is too short causes subsequent stuff
* in the packet not to be dissected (e.g., if the octet string
* containing the non-standard data is too short for the data
* supposedly contained in it, and is followed by more items)?
*
* If so, the right fix might be to catch ReportedBoundsError in
* the dissector calling this dissector, and report a malformed
* nonStandardData item, and rethrow other exceptions (as a
* BoundsError means you really *have* run out of packet data).
*/
if(tvb_len >= 23)
{
codec_value = tvb_get_ntohs(tvb,offset+20);
codec_extra = tvb_get_ntohs(tvb,offset+22);
if(codec_extra == 0x0100)
{
proto_tree_add_text(tr, tvb, offset+20, 2, "Microsoft NetMeeting Codec=0x%04X %s",
codec_value,val_to_str(codec_value, ms_codec_vals,"Unknown (%u)"));
}
else
{
proto_tree_add_text(tr, tvb, offset, -1, "Microsoft NetMeeting Non Standard");
}
}
}
/* Register all the bits needed with the filtering engine */
void
proto_register_nonstd(void)
{
static gint *ett[] = {
&ett_nonstd,
};
proto_nonstd = proto_register_protocol("H221NonStandard","h221nonstd", "h221nonstd");
proto_register_subtree_array(ett, array_length(ett));
}
/* The registration hand-off routine */
void
proto_reg_handoff_nonstd(void)
{
static dissector_handle_t ms_nonstd_handle;
ms_nonstd_handle = create_dissector_handle(dissect_ms_nonstd, proto_nonstd);
dissector_add_uint("h245.nsp.h221",0xb500534c, ms_nonstd_handle);
dissector_add_uint("h225.nsp.h221",0xb500534c, ms_nonstd_handle);
}
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