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/*
*
* oFono - Open Source Telephony
*
* Copyright (C) 2008-2009 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include "simutil.h"
/* Parse ASN.1 Basic Encoding Rules TLVs per ISO/IEC 7816 */
const guint8 *ber_tlv_find_by_tag(const guint8 *pdu, guint8 in_tag,
int in_len, int *out_len)
{
guint8 tag;
int len;
const guint8 *end = pdu + in_len;
do {
while (pdu < end && (*pdu == 0x00 || *pdu == 0xff))
pdu ++;
if (pdu == end)
break;
tag = *pdu ++;
if (!(0x1f & ~tag))
while (pdu < end && (*pdu ++ & 0x80));
if (pdu == end)
break;
for (len = 0; pdu + 1 < end && (*pdu & 0x80);
len = (len | (*pdu ++ & 0x7f)) << 7);
if (*pdu & 0x80)
break;
len |= *pdu ++;
if (tag == in_tag && pdu + len <= end) {
if (out_len)
*out_len = len;
return pdu;
}
pdu += len;
} while (pdu < end);
return NULL;
}
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