2 * Copyright (c) 1995, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.15 1997-09-01 08:51:06 adam
8 * New windows NT/95 port using MSV5.0. Had to avoid a few static
9 * variables used in function ber_tag. These are now part of the
12 * Revision 1.14 1997/05/14 06:53:56 adam
15 * Revision 1.13 1995/09/29 17:12:21 quinn
18 * Revision 1.12 1995/09/27 15:02:57 quinn
19 * Modified function heads & prototypes.
21 * Revision 1.11 1995/05/16 08:50:48 quinn
22 * License, documentation, and memory fixes
24 * Revision 1.10 1995/04/18 08:15:18 quinn
25 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
26 * neater. We'll make the same change for decoding one day.
28 * Revision 1.9 1995/03/15 08:37:18 quinn
29 * Fixed protocol bugs.
31 * Revision 1.8 1995/03/10 11:44:40 quinn
32 * Fixed serious stack-bug in odr_cons_begin
34 * Revision 1.7 1995/03/08 12:12:13 quinn
35 * Added better error checking.
37 * Revision 1.6 1995/02/14 11:54:33 quinn
40 * Revision 1.5 1995/02/10 18:57:24 quinn
41 * More in the way of error-checking.
43 * Revision 1.4 1995/02/10 15:55:28 quinn
46 * Revision 1.3 1995/02/09 15:51:46 quinn
49 * Revision 1.2 1995/02/07 17:52:59 quinn
50 * A damn mess, but now things work, I think.
52 * Revision 1.1 1995/02/02 16:21:53 quinn
62 * if p: write tag. return 1 (success) or -1 (error).
65 * if tag && zclass match up, advance pointer and return 1. set cons.
66 * else leave pointer unchanged. Return 0.
68 * Should perhaps be odr_tag?
70 int ber_tag(ODR o, void *p, int zclass, int tag, int *constructed, int opt)
73 static int lclass = -1, ltag, br, lcons; /* save t&c rather than
76 Odr_ber_tag *odr_ber_tag = &o->odr_ber_tag;
80 if (o->direction == ODR_DECODE)
85 odr_seek(o, ODR_S_SET, 0);
88 odr_ber_tag->lclass = -1;
99 if ((rd = ber_enctag(o, zclass, tag, *constructed)) < 0)
102 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", zclass, tag,
103 *constructed, o->stackp);
108 if (o->stackp > -1 && !odr_constructed_more(o))
111 o->error = OREQUIRED;
114 if (odr_ber_tag->lclass < 0)
116 if ((odr_ber_tag->br = ber_dectag(o->bp, &odr_ber_tag->lclass,
117 &odr_ber_tag->ltag, &odr_ber_tag->lcons)) <= 0)
123 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", odr_ber_tag->lclass, odr_ber_tag->ltag,
124 odr_ber_tag->lcons, o->stackp);
127 if (zclass == odr_ber_tag->lclass && tag == odr_ber_tag->ltag)
129 o->bp += odr_ber_tag->br;
130 o->left -= odr_ber_tag->br;
131 *constructed = odr_ber_tag->lcons;
132 odr_ber_tag->lclass = -1;
138 o->error = OREQUIRED;
143 o->error = OREQUIRED;
152 * BER-encode a zclass/tag/constructed package (identifier octets). Return
153 * number of bytes encoded, or -1 if out of bounds.
155 int ber_enctag(ODR o, int zclass, int tag, int constructed)
157 int cons = (constructed ? 1 : 0), n = 0;
158 unsigned char octs[sizeof(int)], b;
160 b = (zclass << 6) & 0XC0;
161 b |= (cons << 5) & 0X20;
165 if (odr_putc(o, b) < 0)
172 if (odr_putc(o, b) < 0)
176 octs[n++] = tag & 0X7F;
184 oo = octs[n] | ((n > 0) << 7);
185 if (odr_putc(o, oo) < 0)
193 * Decode BER identifier octets. Return number of bytes read or -1 for error.
195 int ber_dectag(unsigned char *buf, int *zclass, int *tag, int *constructed)
197 unsigned char *b = buf;
200 *constructed = (*b >> 5) & 0X01;
201 if ((*tag = *b & 0x1F) <= 30)
209 if (b - buf >= 5) /* Precaution */
212 while (*(b++) & 0X80);