gen_length.c revision 72445 
1/*
2 * Copyright (c) 1997 - 2000 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "gen_locl.h"
35
36RCSID("$Id: gen_length.c,v 1.10 2000/06/21 22:40:53 assar Exp $");
37
38static void
39length_primitive (const char *typename,
40		  const char *name,
41		  const char *variable)
42{
43    fprintf (codefile, "%s += length_%s(%s);\n", variable, typename, name);
44}
45
46static void
47length_type (const char *name, const Type *t, const char *variable)
48{
49    switch (t->type) {
50    case TType:
51#if 0
52	length_type (name, t->symbol->type);
53#endif
54	fprintf (codefile, "%s += length_%s(%s);\n",
55		 variable, t->symbol->gen_name, name);
56	break;
57    case TInteger:
58        if(t->members == NULL)
59            length_primitive ("integer", name, variable);
60        else {
61            char *s;
62            asprintf(&s, "(const int*)%s", name);
63            if(s == NULL)
64		errx (1, "out of memory");
65            length_primitive ("integer", s, variable);
66            free(s);
67        }
68	break;
69    case TUInteger:
70	length_primitive ("unsigned", name, variable);
71	break;
72    case TOctetString:
73	length_primitive ("octet_string", name, variable);
74	break;
75    case TBitString: {
76	/*
77	 * XXX - Hope this is correct
78	 * look at TBitString case in `encode_type'
79	 */
80	fprintf (codefile, "%s += 7;\n", variable);
81	break;
82    }
83    case TSequence: {
84	Member *m;
85	int tag = -1;
86
87	if (t->members == NULL)
88	    break;
89
90	for (m = t->members; m && tag != m->val; m = m->next) {
91	    char *s;
92
93	    asprintf (&s, "%s(%s)->%s",
94		      m->optional ? "" : "&", name, m->gen_name);
95	    if (m->optional)
96		fprintf (codefile, "if(%s)", s);
97	    fprintf (codefile, "{\n"
98		     "int oldret = %s;\n"
99		     "%s = 0;\n", variable, variable);
100	    length_type (s, m->type, "ret");
101	    fprintf (codefile, "%s += 1 + length_len(%s) + oldret;\n",
102		     variable, variable);
103	    fprintf (codefile, "}\n");
104	    if (tag == -1)
105		tag = m->val;
106	    free (s);
107	}
108	fprintf (codefile,
109		 "%s += 1 + length_len(%s);\n", variable, variable);
110	break;
111    }
112    case TSequenceOf: {
113	char *n;
114
115	fprintf (codefile,
116		 "{\n"
117		 "int oldret = %s;\n"
118		 "int i;\n"
119		 "%s = 0;\n",
120		 variable, variable);
121
122	fprintf (codefile, "for(i = (%s)->len - 1; i >= 0; --i){\n", name);
123	asprintf (&n, "&(%s)->val[i]", name);
124	length_type(n, t->subtype, variable);
125	fprintf (codefile, "}\n");
126
127	fprintf (codefile,
128		 "%s += 1 + length_len(%s) + oldret;\n"
129		 "}\n", variable, variable);
130	free(n);
131	break;
132    }
133    case TGeneralizedTime:
134	length_primitive ("generalized_time", name, variable);
135	break;
136    case TGeneralString:
137	length_primitive ("general_string", name, variable);
138	break;
139    case TApplication:
140	length_type (name, t->subtype, variable);
141	fprintf (codefile, "ret += 1 + length_len (ret);\n");
142	break;
143    default :
144	abort ();
145    }
146}
147
148void
149generate_type_length (const Symbol *s)
150{
151  fprintf (headerfile,
152	   "size_t length_%s(const %s *);\n",
153	   s->gen_name, s->gen_name);
154
155  fprintf (codefile,
156	   "size_t\n"
157	   "length_%s(const %s *data)\n"
158	   "{\n"
159	   "size_t ret = 0;\n",
160	   s->gen_name, s->gen_name);
161
162  length_type ("data", s->type, "ret");
163  fprintf (codefile, "return ret;\n}\n\n");
164}
165
166