283 lines
7.8 KiB
C
283 lines
7.8 KiB
C
/* packet-jpeg.c
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*
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* Routines for RFC 2435 JPEG dissection
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*
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* $Id$
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*
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* Copyright 2006
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* Erwin Rol <erwin@erwinrol.com>
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* Copyright 2001,
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* Francisco Javier Cabello Torres, <fjcabello@vtools.es>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/rtp_pt.h>
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/* JPEG header fields */
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static int hf_rtp_jpeg_main_hdr = -1;
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static int hf_rtp_jpeg_main_hdr_ts = -1;
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static int hf_rtp_jpeg_main_hdr_offs = -1;
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static int hf_rtp_jpeg_main_hdr_type = -1;
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static int hf_rtp_jpeg_main_hdr_q = -1;
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static int hf_rtp_jpeg_main_hdr_width = -1;
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static int hf_rtp_jpeg_main_hdr_height = -1;
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static int hf_rtp_jpeg_restart_hdr = -1;
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static int hf_rtp_jpeg_restart_hdr_interval = -1;
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static int hf_rtp_jpeg_restart_hdr_f = -1;
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static int hf_rtp_jpeg_restart_hdr_l = -1;
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static int hf_rtp_jpeg_restart_hdr_count = -1;
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static int hf_rtp_jpeg_qtable_hdr = -1;
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static int hf_rtp_jpeg_qtable_hdr_mbz = -1;
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static int hf_rtp_jpeg_qtable_hdr_prec = -1;
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static int hf_rtp_jpeg_qtable_hdr_length = -1;
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static int hf_rtp_jpeg_qtable_hdr_data = -1;
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static int hf_rtp_jpeg_payload = -1;
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static int proto_jpeg = -1;
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/* JPEG fields defining a sub tree */
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static gint ett_jpeg = -1;
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static void
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dissect_jpeg( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
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{
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proto_item *ti = NULL;
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proto_tree *jpeg_tree = NULL;
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proto_tree *main_hdr_tree = NULL;
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proto_tree *restart_hdr_tree = NULL;
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proto_tree *qtable_hdr_tree = NULL;
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guint32 fragment_offset = 0;
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guint16 len = 0;
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guint8 type = 0;
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guint8 q = 0;
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gint h = 0;
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gint w = 0;
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unsigned int offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "JPEG");
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col_set_str(pinfo->cinfo, COL_INFO, "JPEG message");
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if ( tree ) {
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ti = proto_tree_add_item( tree, proto_jpeg, tvb, offset, -1, FALSE );
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jpeg_tree = proto_item_add_subtree( ti, ett_jpeg );
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ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_main_hdr, tvb, offset, 8, FALSE);
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main_hdr_tree = proto_item_add_subtree(ti, ett_jpeg);
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proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_ts, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_offs, tvb, offset, 3, FALSE);
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fragment_offset = tvb_get_ntoh24(tvb, offset);
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offset += 3;
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proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_type, tvb, offset, 1, FALSE);
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type = tvb_get_guint8(tvb, offset);
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offset += 1;
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proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_q, tvb, offset, 1, FALSE);
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q = tvb_get_guint8(tvb, offset);
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offset += 1;
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w = tvb_get_guint8(tvb, offset) * 8;
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proto_tree_add_uint(main_hdr_tree, hf_rtp_jpeg_main_hdr_width, tvb, offset, 1, w);
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offset += 1;
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h = tvb_get_guint8(tvb, offset) * 8;
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proto_tree_add_uint(main_hdr_tree, hf_rtp_jpeg_main_hdr_height, tvb, offset, 1, h);
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offset += 1;
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if (type >= 64 && type <= 127) {
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ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_restart_hdr, tvb, offset, 4, FALSE);
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restart_hdr_tree = proto_item_add_subtree(ti, ett_jpeg);
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proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_interval, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_f, tvb, offset, 2, FALSE);
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proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_l, tvb, offset, 2, FALSE);
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proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_count, tvb, offset, 2, FALSE);
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offset += 2;
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}
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if (q >= 128 && fragment_offset == 0) {
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ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_qtable_hdr, tvb, offset, -1, FALSE);
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qtable_hdr_tree = proto_item_add_subtree(ti, ett_jpeg);
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proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_mbz, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_prec, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_length, tvb, offset, 2, FALSE);
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len = tvb_get_ntohs(tvb, offset);
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offset += 2;
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if (len > 0) {
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proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_data, tvb, offset, len, FALSE);
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offset += len;
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}
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proto_item_set_len(ti, len + 4);
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}
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/* The rest of the packet is the JPEG data */
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proto_tree_add_item( jpeg_tree, hf_rtp_jpeg_payload, tvb, offset, -1, FALSE );
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}
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}
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void
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proto_register_jpeg(void)
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{
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static hf_register_info hf[] =
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{
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{ &hf_rtp_jpeg_main_hdr, {
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"Main Header",
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"jpeg.main_hdr",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_main_hdr_ts, {
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"Type Specific",
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"jpeg.main_hdr.ts",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_main_hdr_offs, {
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"Fragment Offset",
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"jpeg.main_hdr.offset",
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FT_UINT24, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_main_hdr_type, {
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"Type",
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"jpeg.main_hdr.type",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_main_hdr_q, {
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"Q",
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"jpeg.main_hdr.q",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_main_hdr_width, {
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"Width",
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"jpeg.main_hdr.width",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_main_hdr_height, {
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"Height",
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"jpeg.main_hdr.height",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_restart_hdr, {
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"Restart Marker Header",
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"jpeg.restart_hdr",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_restart_hdr_interval, {
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"Restart Interval",
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"jpeg.restart_hdr.interval",
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FT_UINT16, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_restart_hdr_f, {
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"F",
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"jpeg.restart_hdr.f",
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FT_UINT16, BASE_DEC, NULL, 0x8000,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_restart_hdr_l, {
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"L",
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"jpeg.restart_hdr.l",
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FT_UINT16, BASE_DEC, NULL, 0x4000,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_restart_hdr_count, {
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"Restart Count",
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"jpeg.restart_hdr.count",
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FT_UINT16, BASE_DEC, NULL, 0x3FFF,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_qtable_hdr, {
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"Quantization Table Header",
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"jpeg.qtable_hdr",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_qtable_hdr_mbz, {
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"MBZ",
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"jpeg.qtable_hdr.mbz",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_qtable_hdr_prec, {
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"Precision",
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"jpeg.qtable_hdr.precision",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_qtable_hdr_length, {
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"Length",
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"jpeg.qtable_hdr.length",
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FT_UINT16, BASE_DEC, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_qtable_hdr_data, {
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"Quantization Table Data",
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"jpeg.qtable_hdr.data",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL
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}},
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{ &hf_rtp_jpeg_payload, {
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"Payload",
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"jpeg.payload",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL
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}},
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};
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static gint *ett[] =
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{
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&ett_jpeg,
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};
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proto_jpeg = proto_register_protocol("RFC 2435 JPEG","JPEG","jpeg");
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proto_register_field_array(proto_jpeg, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_jpeg(void)
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{
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dissector_handle_t jpeg_handle;
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jpeg_handle = create_dissector_handle(dissect_jpeg, proto_jpeg);
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dissector_add_uint("rtp.pt", PT_JPEG, jpeg_handle);
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}
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