lib/asn1/gen_glue.c

   1 /*
   2  * Copyright (c) 1997, 1999, 2000, 2003 - 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "gen_locl.h"
  37
  38 RCSID("$Id$");
  39
  40 static void
  41 generate_2int (const Type *t, const char *gen_name)
  42 {
  43     Member *m;
  44
  45     fprintf (headerfile,
  46              "unsigned %s2int(%s);\n",
  47              gen_name, gen_name);
  48
  49     fprintf (codefile,
  50              "unsigned %s2int(%s f)\n"
  51              "{\n"
  52              "unsigned r = 0;\n",
  53              gen_name, gen_name);
  54
  55     ASN1_TAILQ_FOREACH(m, t->members, members) {
  56         fprintf (codefile, "if(f.%s) r |= (1U << %d);\n",
  57                  m->gen_name, m->val);
  58     }
  59     fprintf (codefile, "return r;\n"
  60              "}\n\n");
  61 }
  62
  63 static void
  64 generate_int2 (const Type *t, const char *gen_name)
  65 {
  66     Member *m;
  67
  68     fprintf (headerfile,
  69              "%s int2%s(unsigned);\n",
  70              gen_name, gen_name);
  71
  72     fprintf (codefile,
  73              "%s int2%s(unsigned n)\n"
  74              "{\n"
  75              "\t%s flags;\n\n"
  76              "\tmemset(&flags, 0, sizeof(flags));\n\n",
  77              gen_name, gen_name, gen_name);
  78
  79     if(t->members) {
  80         ASN1_TAILQ_FOREACH(m, t->members, members) {
  81             fprintf (codefile, "\tflags.%s = (n >> %d) & 1;\n",
  82                      m->gen_name, m->val);
  83         }
  84     }
  85     fprintf (codefile, "\treturn flags;\n"
  86              "}\n\n");
  87 }
  88
  89 /*
  90  * This depends on the bit string being declared in increasing order
  91  */
  92
  93 static void
  94 generate_units (const Type *t, const char *gen_name)
  95 {
  96     Member *m;
  97
  98     if (template_flag) {
  99         fprintf (headerfile,
 100                  "extern const struct units *asn1_%s_table_units;\n",
 101                  gen_name);
 102         fprintf (headerfile, "#define asn1_%s_units() (asn1_%s_table_units)\n",
 103                  gen_name, gen_name);
 104     } else {
 105         fprintf (headerfile,
 106                  "const struct units * asn1_%s_units(void);\n",
 107                  gen_name);
 108     }
 109
 110     fprintf (codefile,
 111              "static struct units %s_units[] = {\n",
 112              gen_name);
 113
 114     if(t->members) {
 115         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 116             fprintf (codefile,
 117                      "\t{\"%s\",\t1U << %d},\n", m->name, m->val);
 118         }
 119     }
 120
 121     fprintf (codefile,
 122              "\t{NULL,\t0}\n"
 123              "};\n\n");
 124
 125     if (template_flag)
 126         fprintf (codefile,
 127                  "const struct units * asn1_%s_table_units = %s_units;\n",
 128                  gen_name, gen_name);
 129     else
 130         fprintf (codefile,
 131                  "const struct units * asn1_%s_units(void){\n"
 132                  "return %s_units;\n"
 133                  "}\n\n",
 134                  gen_name, gen_name);
 135
 136
 137 }
 138
 139 void
 140 generate_glue (const Type *t, const char *gen_name)
 141 {
 142     switch(t->type) {
 143     case TTag:
 144         generate_glue(t->subtype, gen_name);
 145         break;
 146     case TBitString :
 147         if (!ASN1_TAILQ_EMPTY(t->members)) {
 148             generate_2int (t, gen_name);
 149             generate_int2 (t, gen_name);
 150             if (parse_units_flag)
 151                 generate_units (t, gen_name);
 152         }
 153         break;
 154     default :
 155         break;
 156     }
 157 }