283 lines
8.6 KiB
C
283 lines
8.6 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/rtp_pt.h>
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#include "packet-ber.h"
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void proto_register_jpeg(void);
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void proto_reg_handoff_jpeg(void);
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static dissector_handle_t jpeg_handle;
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static const range_string jpeg_ts_rvals [] = {
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{0, 0, "Progressively scanned"},
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{1, 1, "Odd field of interlaced signal"},
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{2, 2, "Even field of interlaced signal"},
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{3, 3, "Interlaced field to be line doubled"},
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{3, 0xff, "Unspecified"},
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{0, 0, NULL}
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};
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static const range_string jpeg_type_rvals [] = {
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{ 0, 0, "4:2:2 Video"},
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{ 1, 1, "4:2:0 Video"},
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{ 2, 5, "Reserved"}, /* Previously assigned by RFC 2035 */
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{ 6, 63, "Unassigned"},
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{ 64, 64, "4:2:0 Video, Restart Markers present"},
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{ 65, 65, "4:2:0 Video, Restart Markers present"},
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{ 66, 69, "Reserved"}, /* Since [2,5] are reserved */
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{ 70, 127, "Unassigned, Restart Markers present"},
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{128, 255, "Dynamically assigned"},
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{ 0, 0, NULL}
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};
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static int proto_jpeg = -1;
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static int hf_rtp_jpeg_main_hdr = -1;
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static int hf_rtp_jpeg_main_hdr_height = -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_q = -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_type = -1;
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static int hf_rtp_jpeg_main_hdr_width = -1;
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static int hf_rtp_jpeg_payload = -1;
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static int hf_rtp_jpeg_qtable_hdr = -1;
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static int hf_rtp_jpeg_qtable_hdr_data = -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_mbz = -1;
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static int hf_rtp_jpeg_qtable_hdr_prec = -1;
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static int hf_rtp_jpeg_restart_hdr = -1;
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static int hf_rtp_jpeg_restart_hdr_count = -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_interval = -1;
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static int hf_rtp_jpeg_restart_hdr_l = -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 int
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dissect_jpeg( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_ )
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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, ENC_NA );
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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, ENC_NA);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_NA);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_l, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_count, tvb, offset, 2, ENC_BIG_ENDIAN);
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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, ENC_NA);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_NA);
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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, ENC_NA );
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}
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return tvb_captured_length(tvb);
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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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{ &hf_rtp_jpeg_main_hdr,
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{ "Main Header", "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", "jpeg.main_hdr.ts",
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FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(jpeg_ts_rvals), 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", "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", "jpeg.main_hdr.type",
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FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(jpeg_type_rvals), 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", "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", "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", "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", "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", "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", "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", "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", "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", "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", "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", "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", "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", "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", "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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&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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jpeg_handle = register_dissector("jpeg", dissect_jpeg, proto_jpeg);
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/* RFC 2798 */
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register_ber_oid_dissector_handle("0.9.2342.19200300.100.1.60", jpeg_handle, proto_jpeg, "jpegPhoto");
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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_add_uint("rtp.pt", PT_JPEG, jpeg_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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