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/* asn1.c
* Common routines for ASN.1
* 2007 Anders Broman
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <math.h>
#include <glib.h>
#include <epan/packet.h>
#include "asn1.h"
void asn1_ctx_init(asn1_ctx_t *actx, asn1_enc_e encoding, gboolean aligned, packet_info *pinfo) {
memset(actx, '\0', sizeof(*actx));
actx->signature = ASN1_CTX_SIGNATURE;
actx->encoding = encoding;
actx->aligned = aligned;
actx->pinfo = pinfo;
}
gboolean asn1_ctx_check_signature(asn1_ctx_t *actx) {
return actx->signature == ASN1_CTX_SIGNATURE;
}
void asn1_ctx_clean_external(asn1_ctx_t *actx) {
memset(&actx->external, '\0', sizeof(actx->external));
actx->external.hf_index = -1;
}
double asn1_get_real(const guint8 *real_ptr, gint real_len) {
guint8 octet;
const guint8 *p;
guint8 *buf;
double val = 0;
if (real_len < 1) return val;
octet = real_ptr[0];
p = real_ptr + 1;
real_len -= 1;
if (octet & 0x80) { /* binary encoding */
} else if (octet & 0x40) { /* SpecialRealValue */
switch (octet & 0x3F) {
case 0x00: val = HUGE_VAL; break;
case 0x01: val = -HUGE_VAL; break;
}
} else { /* decimal encoding */
buf = ep_alloc0(real_len + 1);
memcpy(buf, p, real_len);
val = atof(buf);
}
return val;
}
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