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/* wimax_tlv.c
* WiMax TLV handling functions
*
* Copyright (c) 2007 by Intel Corporation.
*
* Author: Lu Pan <lu.pan@intel.com>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "wimax_tlv.h"
/*************************************************************/
/* init_tlv_info() */
/* retrive the tlv information from specified tvb and offset */
/* parameter: */
/* info - pointer of a tlv information data structure */
/* return: */
/* 0-success */
/* !=0-the invalid size of the TLV length (failed) */
/*************************************************************/
gint init_tlv_info(tlv_info_t *info, tvbuff_t *tvb, gint offset)
{
guint tlv_len;
/* get TLV type */
info->type = (guint8)tvb_get_guint8( tvb, offset );
/* get TLV length */
tlv_len = (guint)tvb_get_guint8( tvb, (offset + 1) );
/* set the TLV value offset */
info->value_offset = 2;
/* adjust for multiple-byte TLV length */
if((tlv_len & WIMAX_TLV_EXTENDED_LENGTH_MASK) != 0)
{ /* multiple bytes TLV length */
info->length_type = 1;
/* get the size of the TLV length */
tlv_len = (tlv_len & WIMAX_TLV_LENGTH_MASK);
info->size_of_length = tlv_len;
/* update the TLV value offset */
info->value_offset += tlv_len;
switch (tlv_len)
{
case 0:
info->length = 0; /* no length */
break;
case 1:
info->length = (gint32)tvb_get_guint8( tvb, (offset + 2) ); /* 8 bit */
break;
case 2:
info->length = (gint32)tvb_get_ntohs( tvb, (offset + 2) ); /* 16 bit */
break;
case 3:
info->length = (gint32)tvb_get_ntoh24( tvb, (offset + 2) ); /* 24 bit */
break;
case 4:
info->length = (gint32)tvb_get_ntohl( tvb, (offset + 2) ); /* 32 bit */
break;
default:
/* mark invalid tlv */
info->valid = 0;
/* failed, return the invalid size of the tlv length */
return (gint)tlv_len;
break;
}
}
else /* single byte length */
{
info->length_type = 0;
info->size_of_length = 0;
info->length = (gint32)tlv_len;
}
/* mark valid tlv */
info->valid = 1;
/* success */
return 0;
}
/*************************************************************/
/* get_tlv_type() */
/* get the tlv type of the specified tlv information */
/* parameter: */
/* info - pointer of a tlv information data structure */
/* return: */
/* >=0 - TLV type */
/* =-1 - invalid tlv info */
/*************************************************************/
gint get_tlv_type(tlv_info_t *info)
{
if(info->valid)
return (gint)info->type;
return -1;
}
/**************************************************************/
/* get_tlv_size_of_length() */
/* get the size of tlv length of the specified tlv information*/
/* parameter: */
/* info - pointer of a tlv information data structure */
/* return: */
/* >=0 - the size of TLV length */
/* =-1 - invalid tlv info */
/**************************************************************/
gint get_tlv_size_of_length(tlv_info_t *info)
{
if(info->valid)
return (gint)info->size_of_length;
return -1;
}
/*************************************************************/
/* get_tlv_length() */
/* get the tlv length of the specified tlv information */
/* parameter: */
/* info - pointer of a tlv information data structure */
/* return: */
/* >=0 - TLV length */
/* =-1 - invalid tlv info */
/*************************************************************/
gint32 get_tlv_length(tlv_info_t *info)
{
if(info->valid)
return (gint32)info->length;
return -1;
}
/*************************************************************/
/* get_tlv_value_offset() */
/* get the tlv value offset of the specified tlv information */
/* parameter: */
/* info - pointer of a tlv information data structure */
/* return: */
/* >0 - TLV value offset in byte */
/* =-1 - invalid tlv info */
/*************************************************************/
gint get_tlv_value_offset(tlv_info_t *info)
{
if(info->valid)
return (gint)info->value_offset;
return -1;
}
/*************************************************************/
/* get_tlv_length_type() */
/* get the tlv length type of the specified tlv information */
/* parameter: */
/* info - pointer of a tlv information data structure */
/* return: */
/* 0 - single byte TLV length */
/* 1 - multiple bytes TLV length */
/*************************************************************/
gint get_tlv_length_type(tlv_info_t *info)
{
if(info->valid)
return (gint)info->length_type;
return -1;
}
/*
* Editor modelines - http://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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