/* packet-jpeg.c * * Routines for RFC 2435 JPEG dissection * * $Id$ * * Copyright 2006 * Erwin Rol * Copyright 2001, * Francisco Javier Cabello Torres, * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #include /* JPEG header fields */ static int hf_rtp_jpeg_main_hdr = -1; static int hf_rtp_jpeg_main_hdr_ts = -1; static int hf_rtp_jpeg_main_hdr_offs = -1; static int hf_rtp_jpeg_main_hdr_type = -1; static int hf_rtp_jpeg_main_hdr_q = -1; static int hf_rtp_jpeg_main_hdr_width = -1; static int hf_rtp_jpeg_main_hdr_height = -1; static int hf_rtp_jpeg_restart_hdr = -1; static int hf_rtp_jpeg_restart_hdr_interval = -1; static int hf_rtp_jpeg_restart_hdr_f = -1; static int hf_rtp_jpeg_restart_hdr_l = -1; static int hf_rtp_jpeg_restart_hdr_count = -1; static int hf_rtp_jpeg_qtable_hdr = -1; static int hf_rtp_jpeg_qtable_hdr_mbz = -1; static int hf_rtp_jpeg_qtable_hdr_prec = -1; static int hf_rtp_jpeg_qtable_hdr_length = -1; static int hf_rtp_jpeg_qtable_hdr_data = -1; static int hf_rtp_jpeg_payload = -1; static int proto_jpeg = -1; /* JPEG fields defining a sub tree */ static gint ett_jpeg = -1; static void dissect_jpeg( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) { proto_item *ti = NULL; proto_tree *jpeg_tree = NULL; proto_tree *main_hdr_tree = NULL; proto_tree *restart_hdr_tree = NULL; proto_tree *qtable_hdr_tree = NULL; guint32 fragment_offset = 0; guint16 len = 0; guint8 type = 0; guint8 q = 0; gint h = 0; gint w = 0; unsigned int offset = 0; col_set_str(pinfo->cinfo, COL_PROTOCOL, "JPEG"); col_set_str(pinfo->cinfo, COL_INFO, "JPEG message"); if ( tree ) { ti = proto_tree_add_item( tree, proto_jpeg, tvb, offset, -1, FALSE ); jpeg_tree = proto_item_add_subtree( ti, ett_jpeg ); ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_main_hdr, tvb, offset, 8, FALSE); main_hdr_tree = proto_item_add_subtree(ti, ett_jpeg); proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_ts, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_offs, tvb, offset, 3, FALSE); fragment_offset = tvb_get_ntoh24(tvb, offset); offset += 3; proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_type, tvb, offset, 1, FALSE); type = tvb_get_guint8(tvb, offset); offset += 1; proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_q, tvb, offset, 1, FALSE); q = tvb_get_guint8(tvb, offset); offset += 1; w = tvb_get_guint8(tvb, offset) * 8; proto_tree_add_uint(main_hdr_tree, hf_rtp_jpeg_main_hdr_width, tvb, offset, 1, w); offset += 1; h = tvb_get_guint8(tvb, offset) * 8; proto_tree_add_uint(main_hdr_tree, hf_rtp_jpeg_main_hdr_height, tvb, offset, 1, h); offset += 1; if (type >= 64 && type <= 127) { ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_restart_hdr, tvb, offset, 4, FALSE); restart_hdr_tree = proto_item_add_subtree(ti, ett_jpeg); proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_interval, tvb, offset, 2, FALSE); offset += 2; proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_f, tvb, offset, 2, FALSE); proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_l, tvb, offset, 2, FALSE); proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_count, tvb, offset, 2, FALSE); offset += 2; } if (q >= 128 && fragment_offset == 0) { ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_qtable_hdr, tvb, offset, -1, FALSE); qtable_hdr_tree = proto_item_add_subtree(ti, ett_jpeg); proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_mbz, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_prec, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_length, tvb, offset, 2, FALSE); len = tvb_get_ntohs(tvb, offset); offset += 2; if (len > 0) { proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_data, tvb, offset, len, FALSE); offset += len; } proto_item_set_len(ti, len + 4); } /* The rest of the packet is the JPEG data */ proto_tree_add_item( jpeg_tree, hf_rtp_jpeg_payload, tvb, offset, -1, FALSE ); } } void proto_register_jpeg(void) { static hf_register_info hf[] = { { &hf_rtp_jpeg_main_hdr, { "Main Header", "jpeg.main_hdr", FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_main_hdr_ts, { "Type Specific", "jpeg.main_hdr.ts", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_main_hdr_offs, { "Fragment Offset", "jpeg.main_hdr.offset", FT_UINT24, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_main_hdr_type, { "Type", "jpeg.main_hdr.type", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_main_hdr_q, { "Q", "jpeg.main_hdr.q", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_main_hdr_width, { "Width", "jpeg.main_hdr.width", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_main_hdr_height, { "Height", "jpeg.main_hdr.height", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_restart_hdr, { "Restart Marker Header", "jpeg.restart_hdr", FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_restart_hdr_interval, { "Restart Interval", "jpeg.restart_hdr.interval", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_restart_hdr_f, { "F", "jpeg.restart_hdr.f", FT_UINT16, BASE_DEC, NULL, 0x8000, NULL, HFILL }}, { &hf_rtp_jpeg_restart_hdr_l, { "L", "jpeg.restart_hdr.l", FT_UINT16, BASE_DEC, NULL, 0x4000, NULL, HFILL }}, { &hf_rtp_jpeg_restart_hdr_count, { "Restart Count", "jpeg.restart_hdr.count", FT_UINT16, BASE_DEC, NULL, 0x3FFF, NULL, HFILL }}, { &hf_rtp_jpeg_qtable_hdr, { "Quantization Table Header", "jpeg.qtable_hdr", FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_qtable_hdr_mbz, { "MBZ", "jpeg.qtable_hdr.mbz", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_qtable_hdr_prec, { "Precision", "jpeg.qtable_hdr.precision", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_qtable_hdr_length, { "Length", "jpeg.qtable_hdr.length", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_qtable_hdr_data, { "Quantization Table Data", "jpeg.qtable_hdr.data", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_rtp_jpeg_payload, { "Payload", "jpeg.payload", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }}, }; static gint *ett[] = { &ett_jpeg, }; proto_jpeg = proto_register_protocol("RFC 2435 JPEG","JPEG","jpeg"); proto_register_field_array(proto_jpeg, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_jpeg(void) { dissector_handle_t jpeg_handle; jpeg_handle = create_dissector_handle(dissect_jpeg, proto_jpeg); dissector_add_uint("rtp.pt", PT_JPEG, jpeg_handle); }