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/*
* asn1.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: asn1.c,v 1.4 2001/03/15 08:32:58 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <arpa/nameser.h>
#include <unistd.h>
#include "buf.h"
#include "asn1.h"
int
asn1_type(buf_t buf)
{
u_char c;
if (buf_get(buf, &c, 1) != 1)
return (-1);
return (c & 0x1f);
}
int
asn1_len(buf_t buf)
{
u_char *p, c;
int num;
if (buf_get(buf, &c, 1) != 1)
return (-1);
if (c >= 128) {
c &= ~128;
p = buf_ptr(buf);
if (buf_skip(buf, c) < 0)
return (-1);
switch (c) {
case 1:
num = *p;
break;
case 2:
GETSHORT(num, p);
break;
case 3:
p--; GETLONG(num, p);
num &= 0xfff;
break;
case 4:
GETLONG(num, p);
break;
default:
return (-1);
}
}
else num = c;
return (num);
}
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