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chan-capi/chan_capi_qsig_asn197no.c

99 lines
2.9 KiB

/*
* An implementation of Common ISDN API 2.0 for Asterisk
*
* Copyright (C) 2005-2008 Cytronics & Melware
* Copyright (C) 2007 Mario Goegel
*
* Armin Schindler <armin@melware.de>
* Mario Goegel <m.goegel@gmx.de>
*
* This program is free software and may be modified and
* distributed under the terms of the GNU Public License.
*/
/*
* Decoding of name-operations from asn1-97
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "chan_capi_platform.h"
#include "chan_capi20.h"
#include "chan_capi.h"
#include "chan_capi_utils.h"
#include "chan_capi_qsig.h"
#include "chan_capi_qsig_ecma.h"
#include "chan_capi_qsig_asn197no.h"
/*
* Returns an "Name" from an string, encoded as in name-operations-asn1-97
* data should be a buffer with max. 50 bytes, according to spec
* bufds returns size of name in "buf"
* return:
* index counter
*/
unsigned int cc_qsig_asn197no_get_name(char *buf, int buflen, unsigned int *bufds, int *idx, unsigned char *data)
{
int myidx = *idx;
unsigned int nametag;
unsigned int namelength = 0;
unsigned int nametype;
unsigned int namesetlength = 0;
unsigned int namepres;
unsigned int charset = 1;
unsigned int seqlength = 0;
nametag = data[myidx++];
if (nametag == (ASN1_SEQUENCE | ASN1_TC_UNIVERSAL | ASN1_TF_CONSTRUCTED)) { /* 0x30 */
/* This facility is encoded as SEQUENCE */
seqlength = data[++myidx];
myidx++;
cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " Got name sequence (Length= %i)\n", seqlength);
}
if (nametag < 0x80) { /* Tag shows an simple String */
namelength = cc_qsig_asn1_get_string((unsigned char *)buf, buflen, &data[myidx]);
} else { /* Tag shows an context specific String */
nametype = (nametag & 0x0F); /* Type of Name-Struct */
namepres = nametype; /* Name Presentation or Restriction */
switch (nametype) {
case 0: /* Simple Name */
case 2: /* [LENGTH] [STRING] */
namelength = cc_qsig_asn1_get_string((unsigned char *)buf, buflen, &data[myidx]);
break;
case 1: /* Nameset */
case 3: /* [LENGTH] [BIT-STRING] [LENGTH] [STRING] [INTEGER] [LENGTH] [VALUE] */
namesetlength = data[myidx++];
if (data[myidx++] == ASN1_OCTETSTRING) {
/* should be so */
namelength = cc_qsig_asn1_get_string((unsigned char *)buf, buflen, &data[myidx]);
myidx += namelength + 1;
} else {
cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " Namestruct not ECMA conform (String expected)\n");
break;
}
if (data[myidx++] == ASN1_INTEGER) {
charset = cc_qsig_asn1_get_integer(data, &myidx);
} else {
cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " Namestruct not ECMA conform (Integer expected)\n");
}
break;
case 4: /* Name not available */
break;
case 7: /* Namepres. restricted NULL - don't understand ECMA-164, Page 5 */
break;
}
}
if (namelength > 0) {
myidx += namelength + 1;
*bufds = namelength;
return myidx - *idx;
} else {
return 0;
}
}