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/* packet-dmx-chan.c
* DMX Channel Data packet disassembly.
*
* $Id: $
*
* 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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <string.h>
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/prefs.h>
#include <epan/strutil.h>
void proto_reg_handoff_dmx_chan(void);
static int proto_dmx_chan = -1;
static int hf_dmx_chan_output_dmx_data = -1;
static int hf_dmx_chan_output_data_filter = -1;
static int ett_dmx_chan = -1;
/*
* Here are the global variables associated with the preferences for DMX
*/
static gint global_disp_chan_val_type = 0;
static gint global_disp_col_count = 16;
static gint global_disp_chan_nr_type = 0;
static void
dissect_dmx_chan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX Channels");
col_clear(pinfo->cinfo, COL_INFO);
if (tree != NULL) {
const char* chan_format[] = {
"%2u%% ",
"0x%02x ",
"%3u "
};
const char* string_format[] = {
"0x%03x: %s",
"%3u: %s"
};
static char string[255];
proto_item *item;
guint16 length,r,c,row_count;
guint8 v;
char* ptr;
unsigned offset = 0;
proto_tree *ti = proto_tree_add_item(tree, proto_dmx_chan, tvb,
offset, -1, FALSE);
proto_tree *dmx_chan_tree = proto_item_add_subtree(ti, ett_dmx_chan);
length = tvb_reported_length_remaining(tvb, offset);
row_count = (length / global_disp_col_count) + ((length % global_disp_col_count) == 0 ? 0 : 1);
ptr = string;
/* XX: In theory the g_snprintf statements below could store '\0' bytes off the end of the */
/* 'string' buffer'. This is so since g_snprint returns the number of characters which */
/* "would have been written" (whether or not there was room) and since ptr is always */
/* incremented by this amount. In practice the string buffer is large enough such that the */
/* string buffer size is not exceeded even with the maximum number of columns which might */
/* be displayed. */
/* ToDo: consider recoding slightly ... */
for (r = 0; r < row_count;r++) {
for (c = 0;(c < global_disp_col_count) && (((r * global_disp_col_count) + c) < length);c++) {
if ((c % (global_disp_col_count / 2)) == 0) {
ptr += g_snprintf(ptr, (gulong)(sizeof string - strlen(string)), " ");
}
v = tvb_get_guint8(tvb, (offset + (r * global_disp_col_count) + c));
if (global_disp_chan_val_type == 0) {
v = (v * 100) / 255;
if (v == 100) {
ptr += g_snprintf(ptr, (gulong)(sizeof string - strlen(string)), "FL ");
} else {
ptr += g_snprintf(ptr, (gulong)(sizeof string - strlen(string)),
chan_format[global_disp_chan_val_type], v);
}
} else {
ptr += g_snprintf(ptr, (gulong)(sizeof string - strlen(string)),
chan_format[global_disp_chan_val_type], v);
}
}
proto_tree_add_none_format(dmx_chan_tree, hf_dmx_chan_output_dmx_data, tvb,
offset+(r * global_disp_col_count), c,
string_format[global_disp_chan_nr_type],
(r * global_disp_col_count) + 1, string);
ptr = string;
}
/* Add the real type hidden */
item = proto_tree_add_item(dmx_chan_tree, hf_dmx_chan_output_data_filter, tvb,
offset, length, ENC_NA );
PROTO_ITEM_SET_HIDDEN(item);
offset += length;
}
}
void
proto_register_dmx_chan(void)
{
static hf_register_info hf[] = {
{ &hf_dmx_chan_output_data_filter,
{ "DMX data filter",
"dmx_chan.data_filter",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_chan_output_dmx_data,
{ "DMX data",
"dmx_chan.dmx_data",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static gint *ett[] = {
&ett_dmx_chan
};
module_t *dmx_chan_module;
static enum_val_t disp_chan_val_types[] = {
{ "pro", "Percent", 0 },
{ "hex", "Hexadecimal", 1 },
{ "dec", "Decimal", 2 },
{ NULL, NULL, 0 }
};
static enum_val_t disp_chan_nr_types[] = {
{ "hex", "Hexadecimal", 0 },
{ "dec", "Decimal", 1 },
{ NULL, NULL, 0 }
};
static enum_val_t col_count[] = {
{ "6", "6", 6 },
{ "10", "10", 10 },
{ "12", "12", 12 },
{ "16", "16", 16 },
{ "24", "24", 24 },
{ NULL, NULL, 0 }
};
proto_dmx_chan = proto_register_protocol("DMX Channels","DMX Channels", "dmx-chan");
proto_register_field_array(proto_dmx_chan, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("dmx-chan", dissect_dmx_chan, proto_dmx_chan);
dmx_chan_module = prefs_register_protocol(proto_dmx_chan, NULL);
prefs_register_enum_preference(dmx_chan_module, "dmx_disp_chan_val_type",
"DMX Display channel value type",
"The way DMX values are displayed",
&global_disp_chan_val_type,
disp_chan_val_types, ENC_BIG_ENDIAN);
prefs_register_enum_preference(dmx_chan_module, "dmx_disp_chan_nr_type",
"DMX Display channel nr. type",
"The way DMX channel numbers are displayed",
&global_disp_chan_nr_type,
disp_chan_nr_types, ENC_BIG_ENDIAN);
prefs_register_enum_preference(dmx_chan_module, "dmx_disp_col_count",
"DMX Display Column Count",
"The number of columns for the DMX display",
&global_disp_col_count,
col_count, ENC_BIG_ENDIAN);
}
void
proto_reg_handoff_dmx_chan(void)
{
}
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