/* packet-jpeg.c * * Routines for RFC 2435 JPEG dissection * * Copyright 2006 * Erwin Rol * Copyright 2001, * Francisco Javier Cabello Torres, * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #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; static int hf_rtp_jpeg_main_hdr; static int hf_rtp_jpeg_main_hdr_height; static int hf_rtp_jpeg_main_hdr_offs; static int hf_rtp_jpeg_main_hdr_q; static int hf_rtp_jpeg_main_hdr_ts; static int hf_rtp_jpeg_main_hdr_type; static int hf_rtp_jpeg_main_hdr_width; static int hf_rtp_jpeg_payload; static int hf_rtp_jpeg_qtable_hdr; static int hf_rtp_jpeg_qtable_hdr_data; static int hf_rtp_jpeg_qtable_hdr_length; static int hf_rtp_jpeg_qtable_hdr_mbz; static int hf_rtp_jpeg_qtable_hdr_prec; static int hf_rtp_jpeg_restart_hdr; static int hf_rtp_jpeg_restart_hdr_count; static int hf_rtp_jpeg_restart_hdr_f; static int hf_rtp_jpeg_restart_hdr_interval; static int hf_rtp_jpeg_restart_hdr_l; /* JPEG fields defining a sub tree */ static int ett_jpeg; 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; uint32_t fragment_offset = 0; uint16_t len = 0; uint8_t type = 0; uint8_t q = 0; int h = 0; int 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_uint8(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_uint8(tvb, offset); offset += 1; w = tvb_get_uint8(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_uint8(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 int *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: */