/* wimax_hack_decoder.c
 * WiMax HARQ ACK Burst decoder
 *
 * Copyright (c) 2007 by Intel Corporation.
 *
 * Author: Lu Pan <lu.pan@intel.com>
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/* Include files */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <glib.h>
#include <epan/packet.h>

extern gint proto_wimax;

/* forward reference */
static void dissect_wimax_hack_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

static gint proto_wimax_hack_decoder = -1;
static gint ett_wimax_hack_decoder = -1;

/* Setup protocol subtree array */
static gint *ett[] =
{
	&ett_wimax_hack_decoder,
};

static const value_string vals_flags[] =
{
    {0, "Even Half-Slot (tiles 0,2,4)"},
    {1, "Odd Half-Slot (tiles 1,3,5)"},
    {0, NULL}
};

static const value_string vals_values[] =
{
    {0, "ACK"},
    {1, "NACK"},
    {0, NULL}
};

static gint hf_hack_burst = -1;
static gint hf_hack_num_of_hacks = -1;
static gint hf_hack_half_slot_flag = -1;
static gint hf_hack_subchannel = -1;
static gint hf_hack_symboloffset = -1;
static gint hf_hack_value = -1;

/* HARQ ACK display */
static hf_register_info hf[] =
{
	{
		&hf_hack_burst,
		{"HARQ ACK Burst", "wmx.hack.burst", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL}
	},
	{
		&hf_hack_num_of_hacks,
		{"Number Of HARQ ACKs/NACKs", "wmx.hack.num_of_hacks", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}
	},
	{
		&hf_hack_subchannel,
		{"Physical Subchannel", "wmx.hack.subchannel", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}
	},
	{
		&hf_hack_symboloffset,
		{"Symbol Offset", "wmx.hack.symbol_offset", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}
	},
	{
		&hf_hack_half_slot_flag,
		{"Half-Slot Flag", "wmx.hack.half_slot_flag", FT_UINT8, BASE_DEC, VALS(vals_flags), 0x0, "", HFILL}
	},
	{
		&hf_hack_value,
		{"ACK Value", "wmx.hack.hack_value", FT_UINT8, BASE_DEC, VALS(vals_values), 0x0, "", HFILL}
	}
};

/* Register Wimax HARQ ACK Protocol */
void proto_register_wimax_hack(void)
{
	if (proto_wimax_hack_decoder == -1)
	{
		proto_wimax_hack_decoder = proto_wimax;

		register_dissector("wimax_hack_burst_handler", dissect_wimax_hack_decoder, -1);
		proto_register_field_array(proto_wimax_hack_decoder, hf, array_length(hf));
		proto_register_subtree_array(ett, array_length(ett));
	}
}

static void dissect_wimax_hack_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	gint offset = 0;
	guint length, num_of_hacks, i;
	proto_item *hack_item = NULL;
	proto_tree *hack_tree = NULL;

	/* update the info column */
	if (check_col(pinfo->cinfo, COL_INFO))
	{
		col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "HARQ ACK Burst:");
	}
	if (tree)
	{	/* we are being asked for details */
		/* get the tvb reported length */
		length = tvb_reported_length(tvb);
		/* display HARQ ACK Burst dissector info */
		hack_item = proto_tree_add_protocol_format(tree, proto_wimax_hack_decoder, tvb, offset, length, "HARQ ACK Burst (%u bytes)", length);
		/* add HARQ ACK Burst subtree */
		hack_tree = proto_item_add_subtree(hack_item, ett_wimax_hack_decoder);
		/* get the number of HARQ ACKs */
		num_of_hacks =  tvb_get_guint8(tvb, offset);
		/* display the number of HARQ ACKs */
		proto_tree_add_item(hack_tree, hf_hack_num_of_hacks, tvb, offset++, 1, FALSE);
		/* display the HARQ ACKs */
		for(i = 0; i < num_of_hacks; i++)
		{
			proto_tree_add_item(hack_tree, hf_hack_subchannel, tvb, offset++, 1, FALSE);
			proto_tree_add_item(hack_tree, hf_hack_symboloffset, tvb, offset++, 1, FALSE);
			proto_tree_add_item(hack_tree, hf_hack_half_slot_flag, tvb, offset++, 1, FALSE);
			proto_tree_add_item(hack_tree, hf_hack_value, tvb, offset++, 1, FALSE);
		}
	}
}