2 * Copyright (c) 1995-1999, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.19 1999-01-08 11:23:25 adam
8 * Added const modifier to some of the BER/ODR encoding routines.
10 * Revision 1.18 1998/02/11 11:53:34 adam
11 * Changed code so that it compiles as C++.
13 * Revision 1.17 1997/09/30 09:33:10 adam
14 * Minor changes - removed indentation of ifdef.
16 * Revision 1.16 1997/09/17 12:10:33 adam
19 * Revision 1.15 1997/09/01 08:51:06 adam
20 * New windows NT/95 port using MSV5.0. Had to avoid a few static
21 * variables used in function ber_tag. These are now part of the
24 * Revision 1.14 1997/05/14 06:53:56 adam
27 * Revision 1.13 1995/09/29 17:12:21 quinn
30 * Revision 1.12 1995/09/27 15:02:57 quinn
31 * Modified function heads & prototypes.
33 * Revision 1.11 1995/05/16 08:50:48 quinn
34 * License, documentation, and memory fixes
36 * Revision 1.10 1995/04/18 08:15:18 quinn
37 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
38 * neater. We'll make the same change for decoding one day.
40 * Revision 1.9 1995/03/15 08:37:18 quinn
41 * Fixed protocol bugs.
43 * Revision 1.8 1995/03/10 11:44:40 quinn
44 * Fixed serious stack-bug in odr_cons_begin
46 * Revision 1.7 1995/03/08 12:12:13 quinn
47 * Added better error checking.
49 * Revision 1.6 1995/02/14 11:54:33 quinn
52 * Revision 1.5 1995/02/10 18:57:24 quinn
53 * More in the way of error-checking.
55 * Revision 1.4 1995/02/10 15:55:28 quinn
58 * Revision 1.3 1995/02/09 15:51:46 quinn
61 * Revision 1.2 1995/02/07 17:52:59 quinn
62 * A damn mess, but now things work, I think.
64 * Revision 1.1 1995/02/02 16:21:53 quinn
74 * if p: write tag. return 1 (success) or -1 (error).
77 * if tag && zclass match up, advance pointer and return 1. set cons.
78 * else leave pointer unchanged. Return 0.
80 * Should perhaps be odr_tag?
82 int ber_tag(ODR o, void *p, int zclass, int tag, int *constructed, int opt)
84 Odr_ber_tag *odr_ber_tag = &o->odr_ber_tag;
86 char **pp = (char **)p;
88 if (o->direction == ODR_DECODE)
93 odr_seek(o, ODR_S_SET, 0);
96 odr_ber_tag->lclass = -1;
104 o->error = OREQUIRED;
107 if ((rd = ber_enctag(o, zclass, tag, *constructed)) < 0)
110 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", zclass, tag,
111 *constructed, o->stackp);
116 if (o->stackp > -1 && !odr_constructed_more(o))
119 o->error = OREQUIRED;
122 if (odr_ber_tag->lclass < 0)
124 if ((odr_ber_tag->br = ber_dectag(o->bp, &odr_ber_tag->lclass,
125 &odr_ber_tag->ltag, &odr_ber_tag->lcons)) <= 0)
132 "\n[class=%d,tag=%d,cons=%d,stackp=%d]",
133 odr_ber_tag->lclass, odr_ber_tag->ltag,
134 odr_ber_tag->lcons, o->stackp);
137 if (zclass == odr_ber_tag->lclass && tag == odr_ber_tag->ltag)
139 o->bp += odr_ber_tag->br;
140 o->left -= odr_ber_tag->br;
141 *constructed = odr_ber_tag->lcons;
142 odr_ber_tag->lclass = -1;
148 o->error = OREQUIRED;
153 o->error = OREQUIRED;
162 * BER-encode a zclass/tag/constructed package (identifier octets). Return
163 * number of bytes encoded, or -1 if out of bounds.
165 int ber_enctag(ODR o, int zclass, int tag, int constructed)
167 int cons = (constructed ? 1 : 0), n = 0;
168 unsigned char octs[sizeof(int)], b;
170 b = (zclass << 6) & 0XC0;
171 b |= (cons << 5) & 0X20;
175 if (odr_putc(o, b) < 0)
182 if (odr_putc(o, b) < 0)
186 octs[n++] = tag & 0X7F;
194 oo = octs[n] | ((n > 0) << 7);
195 if (odr_putc(o, oo) < 0)
203 * Decode BER identifier octets. Return number of bytes read or -1 for error.
205 int ber_dectag(const unsigned char *buf, int *zclass, int *tag, int *constructed)
207 const unsigned char *b = buf;
210 *constructed = (*b >> 5) & 0X01;
211 if ((*tag = *b & 0x1F) <= 30)
219 if (b - buf >= 5) /* Precaution */
222 while (*(b++) & 0X80);