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/* packet-dmx-test.c
* DMX Test packet disassembly.
*
* This dissector is written by
*
* Erwin Rol <erwin@erwinrol.com>
* Copyright 2011 Erwin Rol
*
* Wireshark - Network traffic analyzer
* Gerald Combs <gerald@wireshark.org>
* Copyright 1999 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., 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301, USA.
*/
/*
* This dissector is based on;
* American National Standard E1.11 - 2004
* Entertainment Technology USITT DMX512-A
* Asynchronous Serial Digital Data Transmission Standard
* for Controlling Lighting Equipment and Accessories
*/
#include "config.h"
#include <epan/packet.h>
#define DMX_TEST_PACKET_SIZE 512
#define DMX_TEST_VALUE 0x55
void proto_register_dmx_test(void);
static int proto_dmx_test = -1;
static int hf_dmx_test_data = -1;
static int hf_dmx_test_data_good = -1;
static int hf_dmx_test_data_bad = -1;
static int ett_dmx_test = -1;
static void
dissect_dmx_test(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX Test Frame");
col_clear(pinfo->cinfo, COL_INFO);
if (tree != NULL) {
guint offset = 0;
guint size, i, test_data_is_ok;
proto_tree *test_data_tree;
proto_item *item;
proto_tree *ti = proto_tree_add_item(tree, proto_dmx_test, tvb,
offset, -1, FALSE);
proto_tree *dmx_test_tree = proto_item_add_subtree(ti, ett_dmx_test);
size = tvb_reported_length_remaining(tvb, offset);
item = proto_tree_add_item(dmx_test_tree, hf_dmx_test_data, tvb,
offset, size, ENC_BIG_ENDIAN);
offset += size;
if (size == DMX_TEST_PACKET_SIZE) {
test_data_is_ok = TRUE;
for (i = 0; i < DMX_TEST_PACKET_SIZE; i++) {
if (tvb_get_guint8(tvb, i) != DMX_TEST_VALUE) {
test_data_is_ok = FALSE;
break;
}
}
} else {
test_data_is_ok = FALSE;
}
if (test_data_is_ok) {
proto_item_append_text(ti, ", Data correct");
proto_item_append_text(item, " [correct]");
test_data_tree = proto_item_add_subtree(item, ett_dmx_test);
item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_good, tvb,
offset, size, TRUE);
PROTO_ITEM_SET_GENERATED(item);
item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_bad, tvb,
offset, size, FALSE);
PROTO_ITEM_SET_GENERATED(item);
} else {
proto_item_append_text(ti, ", Data incorrect");
proto_item_append_text(item, " [incorrect]");
test_data_tree = proto_item_add_subtree(item, ett_dmx_test);
item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_good, tvb,
offset, size, FALSE);
PROTO_ITEM_SET_GENERATED(item);
item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_bad, tvb,
offset, size, TRUE);
PROTO_ITEM_SET_GENERATED(item);
}
}
}
void
proto_register_dmx_test(void)
{
static hf_register_info hf[] = {
{ &hf_dmx_test_data,
{ "Test Data", "dmx_test.data",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_test_data_good,
{ "Data Good", "dmx_test.data_good",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"True: test data is correct; False: test data is incorrect", HFILL }},
{ &hf_dmx_test_data_bad,
{ "Data Bad", "dmx_test.data_bad",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"True: test data is incorrect; False: test data is correct", HFILL }},
};
static gint *ett[] = {
&ett_dmx_test
};
proto_dmx_test = proto_register_protocol("DMX Test Frame", "DMX Test Frame", "dmx-test");
proto_register_field_array(proto_dmx_test, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("dmx-test", dissect_dmx_test, proto_dmx_test);
}
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