83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
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/*
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* (CAPI*)
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*
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* An implementation of Common ISDN API 2.0 for
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* Asterisk / OpenPBX.org
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*
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* Copyright (C) 2005-2007 Cytronics & Melware
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* Copyright (C) 2007 Mario Goegel
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*
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* Armin Schindler <armin@melware.de>
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* Mario Goegel <m.goegel@gmx.de>
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*
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* This program is free software and may be modified and
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* distributed under the terms of the GNU Public License.
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*/
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/*
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* Decoding of addressing-data-elements from asn1-97
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <asterisk/channel.h>
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#include <asterisk/options.h>
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#include "chan_capi20.h"
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#include "chan_capi.h"
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#include "chan_capi_qsig.h"
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#include "chan_capi_qsig_asn197ade.h"
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/*
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* Returns an "Party Number" from an string, encoded as in addressing-data-elements-asn1-97
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* data should be a buffer with max. 20 bytes, according to spec
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* return:
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* index counter
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*/
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unsigned int cc_qsig_asn197ade_get_partynumber(unsigned char *buf, int buflen, int *idx, unsigned char *data)
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{
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int myidx = *idx;
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int datalength = data[myidx++];
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int numtype = (data[myidx++] & 0x0F); /* defines type of Number: numDigits, publicPartyNum, nsapEncNum, dataNumDigits */
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/* cc_verbose(1, 1, VERBOSE_PREFIX_4 " * num type %i\n", numtype); */
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switch (numtype){
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case 0:
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if (data[myidx++] > 0) /* length of this context data */
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if (data[myidx++] == ASN1_TC_CONTEXTSPEC)
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myidx += cc_qsig_asn197ade_get_numdigits(buf, buflen, &myidx, data) + 1;
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break;
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case 1: /* publicPartyNumber (E.164) not supported yet */
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return 0;
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break;
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case 2: /* NsapEncodedNumber (some ATM stuff) not supported yet */
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return 0;
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break;
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case 3:
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if (data[myidx++] > 0) /* length of this context data */
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if (data[myidx++] == ASN1_TC_CONTEXTSPEC)
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myidx += cc_qsig_asn197ade_get_numdigits(buf, buflen, &myidx, data) + 1;
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break;
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};
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return myidx - *idx;
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}
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/*
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* Returns an string from ASN.1 encoded string
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*/
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unsigned int cc_qsig_asn197ade_get_numdigits(unsigned char *buf, int buflen, int *idx, unsigned char *data)
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{
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int strsize;
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int myidx = *idx;
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strsize = data[myidx++];
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if (strsize > buflen)
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strsize = buflen;
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memcpy(buf, &data[myidx], strsize);
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buf[strsize] = 0;
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/* cc_verbose(1, 1, VERBOSE_PREFIX_4 " * string length %i\n", strsize); */
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return strsize;
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}
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