2 * Copyright (c) 1995-1997, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.17 1997-09-30 09:33:10 adam
8 * Minor changes - removed indentation of ifdef.
10 * Revision 1.16 1997/09/17 12:10:33 adam
13 * Revision 1.15 1997/09/01 08:51:06 adam
14 * New windows NT/95 port using MSV5.0. Had to avoid a few static
15 * variables used in function ber_tag. These are now part of the
18 * Revision 1.14 1997/05/14 06:53:56 adam
21 * Revision 1.13 1995/09/29 17:12:21 quinn
24 * Revision 1.12 1995/09/27 15:02:57 quinn
25 * Modified function heads & prototypes.
27 * Revision 1.11 1995/05/16 08:50:48 quinn
28 * License, documentation, and memory fixes
30 * Revision 1.10 1995/04/18 08:15:18 quinn
31 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
32 * neater. We'll make the same change for decoding one day.
34 * Revision 1.9 1995/03/15 08:37:18 quinn
35 * Fixed protocol bugs.
37 * Revision 1.8 1995/03/10 11:44:40 quinn
38 * Fixed serious stack-bug in odr_cons_begin
40 * Revision 1.7 1995/03/08 12:12:13 quinn
41 * Added better error checking.
43 * Revision 1.6 1995/02/14 11:54:33 quinn
46 * Revision 1.5 1995/02/10 18:57:24 quinn
47 * More in the way of error-checking.
49 * Revision 1.4 1995/02/10 15:55:28 quinn
52 * Revision 1.3 1995/02/09 15:51:46 quinn
55 * Revision 1.2 1995/02/07 17:52:59 quinn
56 * A damn mess, but now things work, I think.
58 * Revision 1.1 1995/02/02 16:21:53 quinn
68 * if p: write tag. return 1 (success) or -1 (error).
71 * if tag && zclass match up, advance pointer and return 1. set cons.
72 * else leave pointer unchanged. Return 0.
74 * Should perhaps be odr_tag?
76 int ber_tag(ODR o, void *p, int zclass, int tag, int *constructed, int opt)
78 Odr_ber_tag *odr_ber_tag = &o->odr_ber_tag;
82 if (o->direction == ODR_DECODE)
87 odr_seek(o, ODR_S_SET, 0);
90 odr_ber_tag->lclass = -1;
101 if ((rd = ber_enctag(o, zclass, tag, *constructed)) < 0)
104 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", zclass, tag,
105 *constructed, o->stackp);
110 if (o->stackp > -1 && !odr_constructed_more(o))
113 o->error = OREQUIRED;
116 if (odr_ber_tag->lclass < 0)
118 if ((odr_ber_tag->br = ber_dectag(o->bp, &odr_ber_tag->lclass,
119 &odr_ber_tag->ltag, &odr_ber_tag->lcons)) <= 0)
126 "\n[class=%d,tag=%d,cons=%d,stackp=%d]",
127 odr_ber_tag->lclass, odr_ber_tag->ltag,
128 odr_ber_tag->lcons, o->stackp);
131 if (zclass == odr_ber_tag->lclass && tag == odr_ber_tag->ltag)
133 o->bp += odr_ber_tag->br;
134 o->left -= odr_ber_tag->br;
135 *constructed = odr_ber_tag->lcons;
136 odr_ber_tag->lclass = -1;
142 o->error = OREQUIRED;
147 o->error = OREQUIRED;
156 * BER-encode a zclass/tag/constructed package (identifier octets). Return
157 * number of bytes encoded, or -1 if out of bounds.
159 int ber_enctag(ODR o, int zclass, int tag, int constructed)
161 int cons = (constructed ? 1 : 0), n = 0;
162 unsigned char octs[sizeof(int)], b;
164 b = (zclass << 6) & 0XC0;
165 b |= (cons << 5) & 0X20;
169 if (odr_putc(o, b) < 0)
176 if (odr_putc(o, b) < 0)
180 octs[n++] = tag & 0X7F;
188 oo = octs[n] | ((n > 0) << 7);
189 if (odr_putc(o, oo) < 0)
197 * Decode BER identifier octets. Return number of bytes read or -1 for error.
199 int ber_dectag(unsigned char *buf, int *zclass, int *tag, int *constructed)
201 unsigned char *b = buf;
204 *constructed = (*b >> 5) & 0X01;
205 if ((*tag = *b & 0x1F) <= 30)
213 if (b - buf >= 5) /* Precaution */
216 while (*(b++) & 0X80);