2 * Copyright (c) 1995, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.12 1995-09-27 15:02:57 quinn
8 * Modified function heads & prototypes.
10 * Revision 1.11 1995/05/16 08:50:48 quinn
11 * License, documentation, and memory fixes
13 * Revision 1.10 1995/04/18 08:15:18 quinn
14 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
15 * neater. We'll make the same change for decoding one day.
17 * Revision 1.9 1995/03/15 08:37:18 quinn
18 * Fixed protocol bugs.
20 * Revision 1.8 1995/03/10 11:44:40 quinn
21 * Fixed serious stack-bug in odr_cons_begin
23 * Revision 1.7 1995/03/08 12:12:13 quinn
24 * Added better error checking.
26 * Revision 1.6 1995/02/14 11:54:33 quinn
29 * Revision 1.5 1995/02/10 18:57:24 quinn
30 * More in the way of error-checking.
32 * Revision 1.4 1995/02/10 15:55:28 quinn
35 * Revision 1.3 1995/02/09 15:51:46 quinn
38 * Revision 1.2 1995/02/07 17:52:59 quinn
39 * A damn mess, but now things work, I think.
41 * Revision 1.1 1995/02/02 16:21:53 quinn
51 * if p: write tag. return 1 (success) or -1 (error).
54 * if tag && class match up, advance pointer and return 1. set cons.
55 * else leave pointer unchanged. Return 0.
57 * Should perhaps be odr_tag?
59 int MDF ber_tag(ODR o, void *p, int class, int tag, int *constructed, int opt)
61 static int lclass = -1, ltag, br, lcons; /* save t&c rather than
66 if (o->direction == ODR_DECODE)
71 odr_seek(o, ODR_S_SET, 0);
85 if ((rd = ber_enctag(o, class, tag, *constructed)) < 0)
88 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", class, tag,
89 *constructed, o->stackp);
93 if (o->stackp > -1 && !odr_constructed_more(o))
101 if ((br = ber_dectag(o->bp, &lclass, <ag, &lcons)) <= 0)
107 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", lclass, ltag,
111 if (class == lclass && tag == ltag)
115 *constructed = lcons;
122 o->error = OREQUIRED;
127 o->error = OREQUIRED;
129 default: o->error = OOTHER; return 0;
134 * BER-encode a class/tag/constructed package (identifier octets). Return
135 * number of bytes encoded, or -1 if out of bounds.
137 int MDF ber_enctag(ODR o, int class, int tag, int constructed)
139 int cons = (constructed ? 1 : 0), n = 0;
140 unsigned char octs[sizeof(int)], b;
142 b = (class << 6) & 0XC0;
143 b |= (cons << 5) & 0X20;
147 if (odr_putc(o, b) < 0)
154 if (odr_putc(o, b) < 0)
158 octs[n++] = tag & 0X7F;
166 oo = octs[n] | ((n > 0) << 7);
167 if (odr_putc(o, oo) < 0)
175 * Decode BER identifier octets. Return number of bytes read or -1 for error.
177 int MDF ber_dectag(unsigned char *buf, int *class, int *tag, int *constructed)
179 unsigned char *b = buf;
182 *constructed = (*b >> 5) & 0X01;
183 if ((*tag = *b & 0x1F) <= 30)
191 if (b - buf >= 5) /* Precaution */
194 while (*(b++) & 0X80);