2 * Copyright (c) 1995-2000, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.22 2000-02-29 13:44:55 adam
8 * Check for config.h (currently not generated).
10 * Revision 1.21 2000/01/31 13:15:21 adam
11 * Removed uses of assert(3). Cleanup of ODR. CCL parser update so
12 * that some characters are not surrounded by spaces in resulting term.
15 * Revision 1.20 1999/11/30 13:47:11 adam
16 * Improved installation. Moved header files to include/yaz.
18 * Revision 1.19 1999/01/08 11:23:25 adam
19 * Added const modifier to some of the BER/ODR encoding routines.
21 * Revision 1.18 1998/02/11 11:53:34 adam
22 * Changed code so that it compiles as C++.
24 * Revision 1.17 1997/09/30 09:33:10 adam
25 * Minor changes - removed indentation of ifdef.
27 * Revision 1.16 1997/09/17 12:10:33 adam
30 * Revision 1.15 1997/09/01 08:51:06 adam
31 * New windows NT/95 port using MSV5.0. Had to avoid a few static
32 * variables used in function ber_tag. These are now part of the
35 * Revision 1.14 1997/05/14 06:53:56 adam
38 * Revision 1.13 1995/09/29 17:12:21 quinn
41 * Revision 1.12 1995/09/27 15:02:57 quinn
42 * Modified function heads & prototypes.
44 * Revision 1.11 1995/05/16 08:50:48 quinn
45 * License, documentation, and memory fixes
47 * Revision 1.10 1995/04/18 08:15:18 quinn
48 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
49 * neater. We'll make the same change for decoding one day.
51 * Revision 1.9 1995/03/15 08:37:18 quinn
52 * Fixed protocol bugs.
54 * Revision 1.8 1995/03/10 11:44:40 quinn
55 * Fixed serious stack-bug in odr_cons_begin
57 * Revision 1.7 1995/03/08 12:12:13 quinn
58 * Added better error checking.
60 * Revision 1.6 1995/02/14 11:54:33 quinn
63 * Revision 1.5 1995/02/10 18:57:24 quinn
64 * More in the way of error-checking.
66 * Revision 1.4 1995/02/10 15:55:28 quinn
69 * Revision 1.3 1995/02/09 15:51:46 quinn
72 * Revision 1.2 1995/02/07 17:52:59 quinn
73 * A damn mess, but now things work, I think.
75 * Revision 1.1 1995/02/02 16:21:53 quinn
88 * if p: write tag. return 1 (success) or -1 (error).
91 * if tag && zclass match up, advance pointer and return 1. set cons.
92 * else leave pointer unchanged. Return 0.
94 * Should perhaps be odr_tag?
96 int ber_tag(ODR o, void *p, int zclass, int tag, int *constructed, int opt)
98 Odr_ber_tag *odr_ber_tag = &o->odr_ber_tag;
100 char **pp = (char **)p;
102 if (o->direction == ODR_DECODE)
107 odr_seek(o, ODR_S_SET, 0);
110 odr_ber_tag->lclass = -1;
112 switch (o->direction)
118 o->error = OREQUIRED;
121 if ((rd = ber_enctag(o, zclass, tag, *constructed)) < 0)
124 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", zclass, tag,
125 *constructed, o->stackp);
130 if (o->stackp > -1 && !odr_constructed_more(o))
133 o->error = OREQUIRED;
136 if (odr_ber_tag->lclass < 0)
138 if ((odr_ber_tag->br = ber_dectag(o->bp, &odr_ber_tag->lclass,
139 &odr_ber_tag->ltag, &odr_ber_tag->lcons)) <= 0)
146 "\n[class=%d,tag=%d,cons=%d,stackp=%d]",
147 odr_ber_tag->lclass, odr_ber_tag->ltag,
148 odr_ber_tag->lcons, o->stackp);
151 if (zclass == odr_ber_tag->lclass && tag == odr_ber_tag->ltag)
153 o->bp += odr_ber_tag->br;
154 *constructed = odr_ber_tag->lcons;
155 odr_ber_tag->lclass = -1;
161 o->error = OREQUIRED;
166 o->error = OREQUIRED;
175 * BER-encode a zclass/tag/constructed package (identifier octets). Return
176 * number of bytes encoded, or -1 if out of bounds.
178 int ber_enctag(ODR o, int zclass, int tag, int constructed)
180 int cons = (constructed ? 1 : 0), n = 0;
181 unsigned char octs[sizeof(int)], b;
183 b = (zclass << 6) & 0XC0;
184 b |= (cons << 5) & 0X20;
188 if (odr_putc(o, b) < 0)
195 if (odr_putc(o, b) < 0)
199 octs[n++] = tag & 0X7F;
207 oo = octs[n] | ((n > 0) << 7);
208 if (odr_putc(o, oo) < 0)
216 * Decode BER identifier octets. Return number of bytes read or -1 for error.
218 int ber_dectag(const unsigned char *buf, int *zclass, int *tag, int *constructed)
220 const unsigned char *b = buf;
223 *constructed = (*b >> 5) & 0X01;
224 if ((*tag = *b & 0x1F) <= 30)
232 if (b - buf >= 5) /* Precaution */
235 while (*(b++) & 0X80);