mirror of git://git.sysmocom.de/ofono
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
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/*
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*
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* oFono - Open Source Telephony
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*
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* Copyright (C) 2008-2009 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <glib.h>
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#include "simutil.h"
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/* Parse ASN.1 Basic Encoding Rules TLVs per ISO/IEC 7816 */
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const guint8 *ber_tlv_find_by_tag(const guint8 *pdu, guint8 in_tag,
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int in_len, int *out_len)
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{
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guint8 tag;
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int len;
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const guint8 *end = pdu + in_len;
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do {
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while (pdu < end && (*pdu == 0x00 || *pdu == 0xff))
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pdu ++;
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if (pdu == end)
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break;
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tag = *pdu ++;
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if (!(0x1f & ~tag))
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while (pdu < end && (*pdu ++ & 0x80));
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if (pdu == end)
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break;
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for (len = 0; pdu + 1 < end && (*pdu & 0x80);
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len = (len | (*pdu ++ & 0x7f)) << 7);
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if (*pdu & 0x80)
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break;
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len |= *pdu ++;
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if (tag == in_tag && pdu + len <= end) {
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if (out_len)
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*out_len = len;
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return pdu;
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}
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pdu += len;
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} while (pdu < end);
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return NULL;
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}
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