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/* packet-jpeg.c
*
* Routines for RFC 2435 JPEG dissection
*
* Copyright 2006
* Erwin Rol <erwin@erwinrol.com>
* Copyright 2001,
* Francisco Javier Cabello Torres, <fjcabello@vtools.es>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/rtp_pt.h>
#include "packet-ber.h"
void proto_register_jpeg(void);
void proto_reg_handoff_jpeg(void);
static dissector_handle_t jpeg_handle;
static const range_string jpeg_ts_rvals [] = {
{0, 0, "Progressively scanned"},
{1, 1, "Odd field of interlaced signal"},
{2, 2, "Even field of interlaced signal"},
{3, 3, "Interlaced field to be line doubled"},
{3, 0xff, "Unspecified"},
{0, 0, NULL}
};
static const range_string jpeg_type_rvals [] = {
{ 0, 0, "4:2:2 Video"},
{ 1, 1, "4:2:0 Video"},
{ 2, 5, "Reserved"}, /* Previously assigned by RFC 2035 */
{ 6, 63, "Unassigned"},
{ 64, 64, "4:2:0 Video, Restart Markers present"},
{ 65, 65, "4:2:0 Video, Restart Markers present"},
{ 66, 69, "Reserved"}, /* Since [2,5] are reserved */
{ 70, 127, "Unassigned, Restart Markers present"},
{128, 255, "Dynamically assigned"},
{ 0, 0, NULL}
};
static int proto_jpeg = -1;
static int hf_rtp_jpeg_main_hdr = -1;
static int hf_rtp_jpeg_main_hdr_height = -1;
static int hf_rtp_jpeg_main_hdr_offs = -1;
static int hf_rtp_jpeg_main_hdr_q = -1;
static int hf_rtp_jpeg_main_hdr_ts = -1;
static int hf_rtp_jpeg_main_hdr_type = -1;
static int hf_rtp_jpeg_main_hdr_width = -1;
static int hf_rtp_jpeg_payload = -1;
static int hf_rtp_jpeg_qtable_hdr = -1;
static int hf_rtp_jpeg_qtable_hdr_data = -1;
static int hf_rtp_jpeg_qtable_hdr_length = -1;
static int hf_rtp_jpeg_qtable_hdr_mbz = -1;
static int hf_rtp_jpeg_qtable_hdr_prec = -1;
static int hf_rtp_jpeg_restart_hdr = -1;
static int hf_rtp_jpeg_restart_hdr_count = -1;
static int hf_rtp_jpeg_restart_hdr_f = -1;
static int hf_rtp_jpeg_restart_hdr_interval = -1;
static int hf_rtp_jpeg_restart_hdr_l = -1;
/* JPEG fields defining a sub tree */
static gint ett_jpeg = -1;
static int
dissect_jpeg( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_ )
{
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, ENC_NA );
jpeg_tree = proto_item_add_subtree( ti, ett_jpeg );
ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_main_hdr, tvb, offset, 8, ENC_NA);
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, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_offs, tvb, offset, 3, ENC_BIG_ENDIAN);
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, ENC_BIG_ENDIAN);
type = tvb_get_guint8(tvb, offset);
offset += 1;
proto_tree_add_item(main_hdr_tree, hf_rtp_jpeg_main_hdr_q, tvb, offset, 1, ENC_BIG_ENDIAN);
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, ENC_NA);
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, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_f, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_l, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(restart_hdr_tree, hf_rtp_jpeg_restart_hdr_count, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
}
if (q >= 128 && fragment_offset == 0) {
ti = proto_tree_add_item(jpeg_tree, hf_rtp_jpeg_qtable_hdr, tvb, offset, -1, ENC_NA);
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, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_prec, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(qtable_hdr_tree, hf_rtp_jpeg_qtable_hdr_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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, ENC_NA);
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, ENC_NA );
}
return tvb_captured_length(tvb);
}
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|BASE_RANGE_STRING, RVALS(jpeg_ts_rvals), 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|BASE_RANGE_STRING, RVALS(jpeg_type_rvals), 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));
jpeg_handle = register_dissector("jpeg", dissect_jpeg, proto_jpeg);
/* RFC 2798 */
register_ber_oid_dissector_handle("0.9.2342.19200300.100.1.60", jpeg_handle, proto_jpeg, "jpegPhoto");
}
void
proto_reg_handoff_jpeg(void)
{
dissector_add_uint("rtp.pt", PT_JPEG, jpeg_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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