crypto/heimdal-0.6.3/lib/asn1/gen_encode.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   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
  36 RCSID("$Id: gen_encode.c,v 1.12 2001/09/25 13:39:26 assar Exp $");
  37
  38 static void
  39 encode_primitive (const char *typename, const char *name)
  40 {
  41     fprintf (codefile,
  42              "e = encode_%s(p, len, %s, &l);\n"
  43              "BACK;\n",
  44              typename,
  45              name);
  46 }
  47
  48 static void
  49 encode_type (const char *name, const Type *t)
  50 {
  51     switch (t->type) {
  52     case TType:
  53 #if 0
  54         encode_type (name, t->symbol->type);
  55 #endif
  56         fprintf (codefile,
  57                  "e = encode_%s(p, len, %s, &l);\n"
  58                  "BACK;\n",
  59                  t->symbol->gen_name, name);
  60         break;
  61     case TInteger:
  62         if(t->members == NULL)
  63             encode_primitive ("integer", name);
  64         else {
  65             char *s;
  66             asprintf(&s, "(const int*)%s", name);
  67             if(s == NULL)
  68                 errx(1, "out of memory");
  69             encode_primitive ("integer", s);
  70             free(s);
  71         }
  72         break;
  73     case TUInteger:
  74         encode_primitive ("unsigned", name);
  75         break;
  76     case TOctetString:
  77         encode_primitive ("octet_string", name);
  78         break;
  79     case TOID :
  80         encode_primitive ("oid", name);
  81         break;
  82     case TBitString: {
  83         Member *m;
  84         int pos;
  85         int rest;
  86         int tag = -1;
  87
  88         if (t->members == NULL)
  89             break;
  90
  91         fprintf (codefile, "{\n"
  92                  "unsigned char c = 0;\n");
  93         pos = t->members->prev->val;
  94         /* fix for buggy MIT (and OSF?) code */
  95         if (pos > 31)
  96             abort ();
  97         /*
  98          * It seems that if we do not always set pos to 31 here, the MIT
  99          * code will do the wrong thing.
 100          *
 101          * I hate ASN.1 (and DER), but I hate it even more when everybody
 102          * has to screw it up differently.
 103          */
 104         pos = 31;
 105         rest = 7 - (pos % 8);
 106
 107         for (m = t->members->prev; m && tag != m->val; m = m->prev) {
 108             while (m->val / 8 < pos / 8) {
 109                 fprintf (codefile,
 110                          "*p-- = c; len--; ret++;\n"
 111                          "c = 0;\n");
 112                 pos -= 8;
 113             }
 114             fprintf (codefile,
 115                      "if(%s->%s) c |= 1<<%d;\n", name, m->gen_name,
 116                      7 - m->val % 8);
 117
 118             if (tag == -1)
 119                 tag = m->val;
 120         }
 121
 122         fprintf (codefile,
 123                  "*p-- = c;\n"
 124                  "*p-- = %d;\n"
 125                  "len -= 2;\n"
 126                  "ret += 2;\n"
 127                  "}\n\n"
 128                  "e = der_put_length_and_tag (p, len, ret, UNIV, PRIM,"
 129                  "UT_BitString, &l);\n"
 130                  "BACK;\n",
 131                  rest);
 132         break;
 133     }
 134     case TEnumerated : {
 135         encode_primitive ("enumerated", name);
 136         break;
 137     }
 138     case TSequence: {
 139         Member *m;
 140         int tag = -1;
 141
 142         if (t->members == NULL)
 143             break;
 144
 145         for (m = t->members->prev; m && tag != m->val; m = m->prev) {
 146             char *s;
 147
 148             asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name);
 149             if (m->optional)
 150                 fprintf (codefile,
 151                          "if(%s)\n",
 152                          s);
 153 #if 1
 154             fprintf (codefile, "{\n"
 155                      "int oldret = ret;\n"
 156                      "ret = 0;\n");
 157 #endif
 158             encode_type (s, m->type);
 159             fprintf (codefile,
 160                      "e = der_put_length_and_tag (p, len, ret, CONTEXT, CONS, "
 161                      "%d, &l);\n"
 162                      "BACK;\n",
 163                      m->val);
 164 #if 1
 165             fprintf (codefile,
 166                      "ret += oldret;\n"
 167                      "}\n");
 168 #endif
 169             if (tag == -1)
 170                 tag = m->val;
 171             free (s);
 172         }
 173         fprintf (codefile,
 174                  "e = der_put_length_and_tag (p, len, ret, UNIV, CONS, UT_Sequence, &l);\n"
 175                  "BACK;\n");
 176         break;
 177     }
 178     case TSequenceOf: {
 179         char *n;
 180
 181         fprintf (codefile,
 182                  "for(i = (%s)->len - 1; i >= 0; --i) {\n"
 183 #if 1
 184                  "int oldret = ret;\n"
 185                  "ret = 0;\n",
 186 #else
 187                  ,
 188 #endif
 189                  name);
 190         asprintf (&n, "&(%s)->val[i]", name);
 191         encode_type (n, t->subtype);
 192         fprintf (codefile,
 193 #if 1
 194                  "ret += oldret;\n"
 195 #endif
 196                  "}\n"
 197                  "e = der_put_length_and_tag (p, len, ret, UNIV, CONS, UT_Sequence, &l);\n"
 198                  "BACK;\n");
 199         free (n);
 200         break;
 201     }
 202     case TGeneralizedTime:
 203         encode_primitive ("generalized_time", name);
 204         break;
 205     case TGeneralString:
 206         encode_primitive ("general_string", name);
 207         break;
 208     case TApplication:
 209         encode_type (name, t->subtype);
 210         fprintf (codefile,
 211                  "e = der_put_length_and_tag (p, len, ret, APPL, CONS, %d, &l);\n"
 212                  "BACK;\n",
 213                  t->application);
 214         break;
 215     default:
 216         abort ();
 217     }
 218 }
 219
 220 void
 221 generate_type_encode (const Symbol *s)
 222 {
 223   fprintf (headerfile,
 224            "int    "
 225            "encode_%s(unsigned char *, size_t, const %s *, size_t *);\n",
 226            s->gen_name, s->gen_name);
 227
 228   fprintf (codefile, "#define BACK if (e) return e; p -= l; len -= l; ret += l\n\n");
 229
 230
 231   fprintf (codefile, "int\n"
 232            "encode_%s(unsigned char *p, size_t len,"
 233            " const %s *data, size_t *size)\n"
 234            "{\n",
 235            s->gen_name, s->gen_name);
 236
 237   switch (s->type->type) {
 238   case TInteger:
 239   case TUInteger:
 240   case TOctetString:
 241   case TGeneralizedTime:
 242   case TGeneralString:
 243   case TBitString:
 244   case TEnumerated:
 245   case TOID:
 246   case TSequence:
 247   case TSequenceOf:
 248   case TApplication:
 249   case TType:
 250     fprintf (codefile,
 251              "size_t ret = 0;\n"
 252              "size_t l;\n"
 253              "int i, e;\n\n");
 254     fprintf(codefile, "i = 0;\n"); /* hack to avoid `unused variable' */
 255
 256       encode_type("data", s->type);
 257
 258     fprintf (codefile, "*size = ret;\n"
 259              "return 0;\n");
 260     break;
 261   default:
 262     abort ();
 263   }
 264   fprintf (codefile, "}\n\n");
 265 }