2 * Copyright (c) 1995-1999, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.20 1999-11-30 13:47:11 adam
8 * Improved installation. Moved header files to include/yaz.
10 * Revision 1.19 1999/01/08 11:23:25 adam
11 * Added const modifier to some of the BER/ODR encoding routines.
13 * Revision 1.18 1998/02/11 11:53:34 adam
14 * Changed code so that it compiles as C++.
16 * Revision 1.17 1997/09/30 09:33:10 adam
17 * Minor changes - removed indentation of ifdef.
19 * Revision 1.16 1997/09/17 12:10:33 adam
22 * Revision 1.15 1997/09/01 08:51:06 adam
23 * New windows NT/95 port using MSV5.0. Had to avoid a few static
24 * variables used in function ber_tag. These are now part of the
27 * Revision 1.14 1997/05/14 06:53:56 adam
30 * Revision 1.13 1995/09/29 17:12:21 quinn
33 * Revision 1.12 1995/09/27 15:02:57 quinn
34 * Modified function heads & prototypes.
36 * Revision 1.11 1995/05/16 08:50:48 quinn
37 * License, documentation, and memory fixes
39 * Revision 1.10 1995/04/18 08:15:18 quinn
40 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
41 * neater. We'll make the same change for decoding one day.
43 * Revision 1.9 1995/03/15 08:37:18 quinn
44 * Fixed protocol bugs.
46 * Revision 1.8 1995/03/10 11:44:40 quinn
47 * Fixed serious stack-bug in odr_cons_begin
49 * Revision 1.7 1995/03/08 12:12:13 quinn
50 * Added better error checking.
52 * Revision 1.6 1995/02/14 11:54:33 quinn
55 * Revision 1.5 1995/02/10 18:57:24 quinn
56 * More in the way of error-checking.
58 * Revision 1.4 1995/02/10 15:55:28 quinn
61 * Revision 1.3 1995/02/09 15:51:46 quinn
64 * Revision 1.2 1995/02/07 17:52:59 quinn
65 * A damn mess, but now things work, I think.
67 * Revision 1.1 1995/02/02 16:21:53 quinn
77 * if p: write tag. return 1 (success) or -1 (error).
80 * if tag && zclass match up, advance pointer and return 1. set cons.
81 * else leave pointer unchanged. Return 0.
83 * Should perhaps be odr_tag?
85 int ber_tag(ODR o, void *p, int zclass, int tag, int *constructed, int opt)
87 Odr_ber_tag *odr_ber_tag = &o->odr_ber_tag;
89 char **pp = (char **)p;
91 if (o->direction == ODR_DECODE)
96 odr_seek(o, ODR_S_SET, 0);
99 odr_ber_tag->lclass = -1;
101 switch (o->direction)
107 o->error = OREQUIRED;
110 if ((rd = ber_enctag(o, zclass, tag, *constructed)) < 0)
113 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", zclass, tag,
114 *constructed, o->stackp);
119 if (o->stackp > -1 && !odr_constructed_more(o))
122 o->error = OREQUIRED;
125 if (odr_ber_tag->lclass < 0)
127 if ((odr_ber_tag->br = ber_dectag(o->bp, &odr_ber_tag->lclass,
128 &odr_ber_tag->ltag, &odr_ber_tag->lcons)) <= 0)
135 "\n[class=%d,tag=%d,cons=%d,stackp=%d]",
136 odr_ber_tag->lclass, odr_ber_tag->ltag,
137 odr_ber_tag->lcons, o->stackp);
140 if (zclass == odr_ber_tag->lclass && tag == odr_ber_tag->ltag)
142 o->bp += odr_ber_tag->br;
143 o->left -= odr_ber_tag->br;
144 *constructed = odr_ber_tag->lcons;
145 odr_ber_tag->lclass = -1;
151 o->error = OREQUIRED;
156 o->error = OREQUIRED;
165 * BER-encode a zclass/tag/constructed package (identifier octets). Return
166 * number of bytes encoded, or -1 if out of bounds.
168 int ber_enctag(ODR o, int zclass, int tag, int constructed)
170 int cons = (constructed ? 1 : 0), n = 0;
171 unsigned char octs[sizeof(int)], b;
173 b = (zclass << 6) & 0XC0;
174 b |= (cons << 5) & 0X20;
178 if (odr_putc(o, b) < 0)
185 if (odr_putc(o, b) < 0)
189 octs[n++] = tag & 0X7F;
197 oo = octs[n] | ((n > 0) << 7);
198 if (odr_putc(o, oo) < 0)
206 * Decode BER identifier octets. Return number of bytes read or -1 for error.
208 int ber_dectag(const unsigned char *buf, int *zclass, int *tag, int *constructed)
210 const unsigned char *b = buf;
213 *constructed = (*b >> 5) & 0X01;
214 if ((*tag = *b & 0x1F) <= 30)
222 if (b - buf >= 5) /* Precaution */
225 while (*(b++) & 0X80);