2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.10 1995-04-18 08:15:18 quinn
8 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
9 * neater. We'll make the same change for decoding one day.
11 * Revision 1.9 1995/03/15 08:37:18 quinn
12 * Fixed protocol bugs.
14 * Revision 1.8 1995/03/10 11:44:40 quinn
15 * Fixed serious stack-bug in odr_cons_begin
17 * Revision 1.7 1995/03/08 12:12:13 quinn
18 * Added better error checking.
20 * Revision 1.6 1995/02/14 11:54:33 quinn
23 * Revision 1.5 1995/02/10 18:57:24 quinn
24 * More in the way of error-checking.
26 * Revision 1.4 1995/02/10 15:55:28 quinn
29 * Revision 1.3 1995/02/09 15:51:46 quinn
32 * Revision 1.2 1995/02/07 17:52:59 quinn
33 * A damn mess, but now things work, I think.
35 * Revision 1.1 1995/02/02 16:21:53 quinn
45 * if p: write tag. return 1 (success) or -1 (error).
48 * if tag && class match up, advance pointer and return 1. set cons.
49 * else leave pointer unchanged. Return 0.
51 * Should perhaps be odr_tag?
53 int ber_tag(ODR o, void *p, int class, int tag, int *constructed, int opt)
55 static int lclass = -1, ltag, br, lcons; /* save t&c rather than
60 if (o->direction == ODR_DECODE)
65 odr_seek(o, ODR_S_SET, 0);
79 if ((rd = ber_enctag(o, class, tag, *constructed)) < 0)
82 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", class, tag,
83 *constructed, o->stackp);
87 if (o->stackp > -1 && !odr_constructed_more(o))
95 if ((br = ber_dectag(o->bp, &lclass, <ag, &lcons)) <= 0)
101 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", lclass, ltag,
105 if (class == lclass && tag == ltag)
109 *constructed = lcons;
116 o->error = OREQUIRED;
121 o->error = OREQUIRED;
123 default: o->error = OOTHER; return 0;
128 * BER-encode a class/tag/constructed package (identifier octets). Return
129 * number of bytes encoded, or -1 if out of bounds.
131 int ber_enctag(ODR o, int class, int tag, int constructed)
133 int cons = (constructed ? 1 : 0), n = 0;
134 unsigned char octs[sizeof(int)], b;
136 b = (class << 6) & 0XC0;
137 b |= (cons << 5) & 0X20;
141 if (odr_putc(o, b) < 0)
148 if (odr_putc(o, b) < 0)
152 octs[n++] = tag & 0X7F;
160 oo = octs[n] | ((n > 0) << 7);
161 if (odr_putc(o, oo) < 0)
169 * Decode BER identifier octets. Return number of bytes read or -1 for error.
171 int ber_dectag(unsigned char *buf, int *class, int *tag, int *constructed)
173 unsigned char *b = buf;
176 *constructed = (*b >> 5) & 0X01;
177 if ((*tag = *b & 0x1F) <= 30)
185 if (b - buf >= 5) /* Precaution */
188 while (*(b++) & 0X80);