lib/asn1/gen_decode.c

   1 /*
   2  * Copyright (c) 1997 - 2006 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 #include "lex.h"
  36
  37 RCSID("$Id$");
  38
  39 static void
  40 decode_primitive (const char *typename, const char *name, const char *forwstr)
  41 {
  42 #if 0
  43     fprintf (codefile,
  44              "e = decode_%s(p, len, %s, &l);\n"
  45              "%s;\n",
  46              typename,
  47              name,
  48              forwstr);
  49 #else
  50     fprintf (codefile,
  51              "e = der_get_%s(p, len, %s, &l);\n"
  52              "if(e) %s;\np += l; len -= l; ret += l;\n",
  53              typename,
  54              name,
  55              forwstr);
  56 #endif
  57 }
  58
  59 static void
  60 find_tag (const Type *t,
  61           Der_class *cl, Der_type *ty, unsigned *tag)
  62 {
  63     switch (t->type) {
  64     case TBitString:
  65         *cl  = ASN1_C_UNIV;
  66         *ty  = PRIM;
  67         *tag = UT_BitString;
  68         break;
  69     case TBoolean:
  70         *cl  = ASN1_C_UNIV;
  71         *ty  = PRIM;
  72         *tag = UT_Boolean;
  73         break;
  74     case TChoice:
  75         errx(1, "Cannot have recursive CHOICE");
  76     case TEnumerated:
  77         *cl  = ASN1_C_UNIV;
  78         *ty  = PRIM;
  79         *tag = UT_Enumerated;
  80         break;
  81     case TGeneralString:
  82         *cl  = ASN1_C_UNIV;
  83         *ty  = PRIM;
  84         *tag = UT_GeneralString;
  85         break;
  86     case TTeletexString:
  87         *cl  = ASN1_C_UNIV;
  88         *ty  = PRIM;
  89         *tag = UT_TeletexString;
  90         break;
  91     case TGeneralizedTime:
  92         *cl  = ASN1_C_UNIV;
  93         *ty  = PRIM;
  94         *tag = UT_GeneralizedTime;
  95         break;
  96     case TIA5String:
  97         *cl  = ASN1_C_UNIV;
  98         *ty  = PRIM;
  99         *tag = UT_IA5String;
 100         break;
 101     case TInteger:
 102         *cl  = ASN1_C_UNIV;
 103         *ty  = PRIM;
 104         *tag = UT_Integer;
 105         break;
 106     case TNull:
 107         *cl  = ASN1_C_UNIV;
 108         *ty  = PRIM;
 109         *tag = UT_Null;
 110         break;
 111     case TOID:
 112         *cl  = ASN1_C_UNIV;
 113         *ty  = PRIM;
 114         *tag = UT_OID;
 115         break;
 116     case TOctetString:
 117         *cl  = ASN1_C_UNIV;
 118         *ty  = PRIM;
 119         *tag = UT_OctetString;
 120         break;
 121     case TPrintableString:
 122         *cl  = ASN1_C_UNIV;
 123         *ty  = PRIM;
 124         *tag = UT_PrintableString;
 125         break;
 126     case TSequence:
 127     case TSequenceOf:
 128         *cl  = ASN1_C_UNIV;
 129         *ty  = CONS;
 130         *tag = UT_Sequence;
 131         break;
 132     case TSet:
 133     case TSetOf:
 134         *cl  = ASN1_C_UNIV;
 135         *ty  = CONS;
 136         *tag = UT_Set;
 137         break;
 138     case TTag:
 139         *cl  = t->tag.tagclass;
 140         *ty  = is_primitive_type(t->subtype->type) ? PRIM : CONS;
 141         *tag = t->tag.tagvalue;
 142         break;
 143     case TType:
 144         if ((t->symbol->stype == Stype && t->symbol->type == NULL)
 145             || t->symbol->stype == SUndefined) {
 146             lex_error_message("%s is imported or still undefined, "
 147                               " can't generate tag checking data in CHOICE "
 148                               "without this information",
 149                               t->symbol->name);
 150             exit(1);
 151         }
 152         find_tag(t->symbol->type, cl, ty, tag);
 153         return;
 154     case TUTCTime:
 155         *cl  = ASN1_C_UNIV;
 156         *ty  = PRIM;
 157         *tag = UT_UTCTime;
 158         break;
 159     case TUTF8String:
 160         *cl  = ASN1_C_UNIV;
 161         *ty  = PRIM;
 162         *tag = UT_UTF8String;
 163         break;
 164     case TBMPString:
 165         *cl  = ASN1_C_UNIV;
 166         *ty  = PRIM;
 167         *tag = UT_BMPString;
 168         break;
 169     case TUniversalString:
 170         *cl  = ASN1_C_UNIV;
 171         *ty  = PRIM;
 172         *tag = UT_UniversalString;
 173         break;
 174     case TVisibleString:
 175         *cl  = ASN1_C_UNIV;
 176         *ty  = PRIM;
 177         *tag = UT_VisibleString;
 178         break;
 179     default:
 180         abort();
 181     }
 182 }
 183
 184 static void
 185 range_check(const char *name,
 186             const char *length,
 187             const char *forwstr,
 188             struct range *r)
 189 {
 190     if (r->min == r->max + 2 || r->min < r->max)
 191         fprintf (codefile,
 192                  "if ((%s)->%s > %lld) {\n"
 193                  "e = ASN1_MAX_CONSTRAINT; %s;\n"
 194                  "}\n",
 195                  name, length, (long long)r->max, forwstr);
 196     if ((r->min - 1 == r->max || r->min < r->max) && r->min > 0)
 197         fprintf (codefile,
 198                  "if ((%s)->%s < %lld) {\n"
 199                  "e = ASN1_MIN_CONSTRAINT; %s;\n"
 200                  "}\n",
 201                  name, length, (long long)r->min, forwstr);
 202     if (r->max == r->min)
 203         fprintf (codefile,
 204                  "if ((%s)->%s != %lld) {\n"
 205                  "e = ASN1_EXACT_CONSTRAINT; %s;\n"
 206                  "}\n",
 207                  name, length, (long long)r->min, forwstr);
 208 }
 209
 210 static int
 211 decode_type (const char *name, const Type *t, int optional,
 212              const char *forwstr, const char *tmpstr, const char *dertype,
 213              unsigned int depth)
 214 {
 215     switch (t->type) {
 216     case TType: {
 217         if (optional)
 218             fprintf(codefile,
 219                     "%s = calloc(1, sizeof(*%s));\n"
 220                     "if (%s == NULL) %s;\n",
 221                     name, name, name, forwstr);
 222         fprintf (codefile,
 223                  "e = decode_%s(p, len, %s, &l);\n",
 224                  t->symbol->gen_name, name);
 225         if (optional) {
 226             fprintf (codefile,
 227                      "if(e) {\n"
 228                      "free(%s);\n"
 229                      "%s = NULL;\n"
 230                      "} else {\n"
 231                      "p += l; len -= l; ret += l;\n"
 232                      "}\n",
 233                      name, name);
 234         } else {
 235             fprintf (codefile,
 236                      "if(e) %s;\n",
 237                      forwstr);
 238             fprintf (codefile,
 239                      "p += l; len -= l; ret += l;\n");
 240         }
 241         break;
 242     }
 243     case TInteger:
 244         if(t->members) {
 245             fprintf(codefile,
 246                     "{\n"
 247                     "int enumint;\n");
 248             decode_primitive ("integer", "&enumint", forwstr);
 249             fprintf(codefile,
 250                     "*%s = enumint;\n"
 251                     "}\n",
 252                     name);
 253         } else if (t->range == NULL) {
 254             decode_primitive ("heim_integer", name, forwstr);
 255         } else if (t->range->min < INT_MIN && t->range->max <= INT64_MAX) {
 256             decode_primitive ("integer64", name, forwstr);
 257         } else if (t->range->min >= 0 && t->range->max > UINT_MAX) {
 258             decode_primitive ("unsigned64", name, forwstr);
 259         } else if (t->range->min >= INT_MIN && t->range->max <= INT_MAX) {
 260             decode_primitive ("integer", name, forwstr);
 261         } else if (t->range->min >= 0 && t->range->max <= UINT_MAX) {
 262             decode_primitive ("unsigned", name, forwstr);
 263         } else
 264             errx(1, "%s: unsupported range %lld -> %lld",
 265                  name, (long long)t->range->min, (long long)t->range->max);
 266         break;
 267     case TBoolean:
 268       decode_primitive ("boolean", name, forwstr);
 269       break;
 270     case TEnumerated:
 271         decode_primitive ("enumerated", name, forwstr);
 272         break;
 273     case TOctetString:
 274         if (dertype) {
 275             fprintf(codefile,
 276                     "if (%s == CONS) {\n",
 277                     dertype);
 278             decode_primitive("octet_string_ber", name, forwstr);
 279             fprintf(codefile,
 280                     "} else {\n");
 281         }
 282         decode_primitive ("octet_string", name, forwstr);
 283         if (dertype)
 284             fprintf(codefile, "}\n");
 285         if (t->range)
 286             range_check(name, "length", forwstr, t->range);
 287         break;
 288     case TBitString: {
 289         Member *m;
 290         int pos = 0;
 291
 292         if (ASN1_TAILQ_EMPTY(t->members)) {
 293             decode_primitive ("bit_string", name, forwstr);
 294             break;
 295         }
 296         fprintf(codefile,
 297                 "if (len < 1) return ASN1_OVERRUN;\n"
 298                 "p++; len--; ret++;\n");
 299         fprintf(codefile,
 300                 "do {\n"
 301                 "if (len < 1) break;\n");
 302         ASN1_TAILQ_FOREACH(m, t->members, members) {
 303             while (m->val / 8 > pos / 8) {
 304                 fprintf (codefile,
 305                          "p++; len--; ret++;\n"
 306                          "if (len < 1) break;\n");
 307                 pos += 8;
 308             }
 309             fprintf (codefile,
 310                      "(%s)->%s = (*p >> %d) & 1;\n",
 311                      name, m->gen_name, 7 - m->val % 8);
 312         }
 313         fprintf(codefile,
 314                 "} while(0);\n");
 315         fprintf (codefile,
 316                  "p += len; ret += len;\n");
 317         break;
 318     }
 319     case TSequence: {
 320         Member *m;
 321
 322         if (t->members == NULL)
 323             break;
 324
 325         ASN1_TAILQ_FOREACH(m, t->members, members) {
 326             char *s = NULL;
 327
 328             if (m->ellipsis)
 329                 continue;
 330
 331             if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&",
 332                           name, m->gen_name) < 0 || s == NULL)
 333                 errx(1, "malloc");
 334             decode_type (s, m->type, m->optional, forwstr, m->gen_name, NULL,
 335                 depth + 1);
 336             free (s);
 337         }
 338
 339         break;
 340     }
 341     case TSet: {
 342         Member *m;
 343         unsigned int memno;
 344
 345         if(t->members == NULL)
 346             break;
 347
 348         fprintf(codefile, "{\n");
 349         fprintf(codefile, "unsigned int members = 0;\n");
 350         fprintf(codefile, "while(len > 0) {\n");
 351         fprintf(codefile,
 352                 "Der_class class;\n"
 353                 "Der_type type;\n"
 354                 "int tag;\n"
 355                 "e = der_get_tag (p, len, &class, &type, &tag, NULL);\n"
 356                 "if(e) %s;\n", forwstr);
 357         fprintf(codefile, "switch (MAKE_TAG(class, type, tag)) {\n");
 358         memno = 0;
 359         ASN1_TAILQ_FOREACH(m, t->members, members) {
 360             char *s;
 361
 362             assert(m->type->type == TTag);
 363
 364             fprintf(codefile, "case MAKE_TAG(%s, %s, %s):\n",
 365                     classname(m->type->tag.tagclass),
 366                     is_primitive_type(m->type->subtype->type) ? "PRIM" : "CONS",
 367                     valuename(m->type->tag.tagclass, m->type->tag.tagvalue));
 368
 369             if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name) < 0 || s == NULL)
 370                 errx(1, "malloc");
 371             if(m->optional)
 372                 fprintf(codefile,
 373                         "%s = calloc(1, sizeof(*%s));\n"
 374                         "if (%s == NULL) { e = ENOMEM; %s; }\n",
 375                         s, s, s, forwstr);
 376             decode_type (s, m->type, 0, forwstr, m->gen_name, NULL, depth + 1);
 377             free (s);
 378
 379             fprintf(codefile, "members |= (1 << %d);\n", memno);
 380             memno++;
 381             fprintf(codefile, "break;\n");
 382         }
 383         fprintf(codefile,
 384                 "default:\n"
 385                 "return ASN1_MISPLACED_FIELD;\n"
 386                 "break;\n");
 387         fprintf(codefile, "}\n");
 388         fprintf(codefile, "}\n");
 389         memno = 0;
 390         ASN1_TAILQ_FOREACH(m, t->members, members) {
 391             char *s;
 392
 393             if (asprintf (&s, "%s->%s", name, m->gen_name) < 0 || s == NULL)
 394                 errx(1, "malloc");
 395             fprintf(codefile, "if((members & (1 << %d)) == 0)\n", memno);
 396             if(m->optional)
 397                 fprintf(codefile, "%s = NULL;\n", s);
 398             else if(m->defval)
 399                 gen_assign_defval(s, m->defval);
 400             else
 401                 fprintf(codefile, "return ASN1_MISSING_FIELD;\n");
 402             free(s);
 403             memno++;
 404         }
 405         fprintf(codefile, "}\n");
 406         break;
 407     }
 408     case TSetOf:
 409     case TSequenceOf: {
 410         char *n = NULL;
 411         char *sname = NULL;
 412
 413         fprintf (codefile,
 414                  "{\n"
 415                  "size_t %s_origlen = len;\n"
 416                  "size_t %s_oldret = ret;\n"
 417                  "size_t %s_olen = 0;\n"
 418                  "void *%s_tmp;\n"
 419                  "ret = 0;\n"
 420                  "(%s)->len = 0;\n"
 421                  "(%s)->val = NULL;\n",
 422                  tmpstr,
 423                  tmpstr,
 424                  tmpstr,
 425                  tmpstr,
 426                  name,
 427                  name);
 428
 429         fprintf (codefile,
 430                  "while(ret < %s_origlen) {\n"
 431                  "size_t %s_nlen = %s_olen + sizeof(*((%s)->val));\n"
 432                  "if (%s_olen > %s_nlen) { e = ASN1_OVERFLOW; %s; }\n"
 433                  "%s_olen = %s_nlen;\n"
 434                  "%s_tmp = realloc((%s)->val, %s_olen);\n"
 435                  "if (%s_tmp == NULL) { e = ENOMEM; %s; }\n"
 436                  "(%s)->val = %s_tmp;\n",
 437                  tmpstr,
 438                  tmpstr, tmpstr, name,
 439                  tmpstr, tmpstr, forwstr,
 440                  tmpstr, tmpstr,
 441                  tmpstr, name, tmpstr,
 442                  tmpstr, forwstr,
 443                  name, tmpstr);
 444
 445         if (asprintf (&n, "&(%s)->val[(%s)->len]", name, name) < 0 || n == NULL)
 446             errx(1, "malloc");
 447         if (asprintf (&sname, "%s_s_of", tmpstr) < 0 || sname == NULL)
 448             errx(1, "malloc");
 449         decode_type (n, t->subtype, 0, forwstr, sname, NULL, depth + 1);
 450         fprintf (codefile,
 451                  "(%s)->len++;\n"
 452                  "len = %s_origlen - ret;\n"
 453                  "}\n"
 454                  "ret += %s_oldret;\n"
 455                  "}\n",
 456                  name,
 457                  tmpstr, tmpstr);
 458         if (t->range)
 459             range_check(name, "len", forwstr, t->range);
 460         free (n);
 461         free (sname);
 462         break;
 463     }
 464     case TGeneralizedTime:
 465         decode_primitive ("generalized_time", name, forwstr);
 466         break;
 467     case TGeneralString:
 468         decode_primitive ("general_string", name, forwstr);
 469         break;
 470     case TTeletexString:
 471         decode_primitive ("general_string", name, forwstr);
 472         break;
 473     case TTag:{
 474         char *tname = NULL, *typestring = NULL;
 475         char *ide = NULL;
 476
 477         if (asprintf(&typestring, "%s_type", tmpstr) < 0 || typestring == NULL)
 478             errx(1, "malloc");
 479
 480         fprintf(codefile,
 481                 "{\n"
 482                 "size_t %s_datalen, %s_oldlen;\n"
 483                 "Der_type %s;\n",
 484                 tmpstr, tmpstr, typestring);
 485         if(support_ber)
 486             fprintf(codefile,
 487                     "int is_indefinite%u;\n", depth);
 488
 489         fprintf(codefile, "e = der_match_tag_and_length(p, len, %s, &%s, %s, "
 490                 "&%s_datalen, &l);\n",
 491                 classname(t->tag.tagclass),
 492                 typestring,
 493                 valuename(t->tag.tagclass, t->tag.tagvalue),
 494                 tmpstr);
 495
 496         /* XXX hardcode for now */
 497         if (support_ber && t->subtype->type == TOctetString) {
 498             ide = typestring;
 499         } else {
 500             fprintf(codefile,
 501                     "if (e == 0 && %s != %s) { e = ASN1_BAD_ID; }\n",
 502                     typestring,
 503                     is_primitive_type(t->subtype->type) ? "PRIM" : "CONS");
 504         }
 505
 506         if(optional) {
 507             fprintf(codefile,
 508                     "if(e) {\n"
 509                     "%s = NULL;\n"
 510                     "} else {\n"
 511                      "%s = calloc(1, sizeof(*%s));\n"
 512                      "if (%s == NULL) { e = ENOMEM; %s; }\n",
 513                      name, name, name, name, forwstr);
 514         } else {
 515             fprintf(codefile, "if(e) %s;\n", forwstr);
 516         }
 517         fprintf (codefile,
 518                  "p += l; len -= l; ret += l;\n"
 519                  "%s_oldlen = len;\n",
 520                  tmpstr);
 521         if(support_ber)
 522             fprintf (codefile,
 523                      "if((is_indefinite%u = _heim_fix_dce(%s_datalen, &len)) < 0)\n"
 524                      "{ e = ASN1_BAD_FORMAT; %s; }\n"
 525                      "if (is_indefinite%u) { if (len < 2) { e = ASN1_OVERRUN; %s; } len -= 2; }",
 526                      depth, tmpstr, forwstr, depth, forwstr);
 527         else
 528             fprintf(codefile,
 529                     "if (%s_datalen > len) { e = ASN1_OVERRUN; %s; }\n"
 530                     "len = %s_datalen;\n", tmpstr, forwstr, tmpstr);
 531         if (asprintf (&tname, "%s_Tag", tmpstr) < 0 || tname == NULL)
 532             errx(1, "malloc");
 533         decode_type (name, t->subtype, 0, forwstr, tname, ide, depth + 1);
 534         if(support_ber)
 535             fprintf(codefile,
 536                     "if(is_indefinite%u){\n"
 537                     "len += 2;\n"
 538                     "e = der_match_tag_and_length(p, len, "
 539                     "(Der_class)0, &%s, UT_EndOfContent, "
 540                     "&%s_datalen, &l);\n"
 541                     "if(e) %s;\n"
 542                     "p += l; len -= l; ret += l;\n"
 543                     "if (%s != (Der_type)0) { e = ASN1_BAD_ID; %s; }\n"
 544                     "} else \n",
 545                     depth,
 546                     typestring,
 547                     tmpstr,
 548                     forwstr,
 549                     typestring, forwstr);
 550         fprintf(codefile,
 551                 "len = %s_oldlen - %s_datalen;\n",
 552                 tmpstr, tmpstr);
 553         if(optional)
 554             fprintf(codefile,
 555                     "}\n");
 556         fprintf(codefile,
 557                 "}\n");
 558         free(tname);
 559         free(typestring);
 560         break;
 561     }
 562     case TChoice: {
 563         Member *m, *have_ellipsis = NULL;
 564         const char *els = "";
 565
 566         if (t->members == NULL)
 567             break;
 568
 569         ASN1_TAILQ_FOREACH(m, t->members, members) {
 570             const Type *tt = m->type;
 571             char *s = NULL;
 572             Der_class cl;
 573             Der_type  ty;
 574             unsigned  tag;
 575
 576             if (m->ellipsis) {
 577                 have_ellipsis = m;
 578                 continue;
 579             }
 580
 581             find_tag(tt, &cl, &ty, &tag);
 582
 583             fprintf(codefile,
 584                     "%sif (der_match_tag(p, len, %s, %s, %s, NULL) == 0) {\n",
 585                     els,
 586                     classname(cl),
 587                     ty ? "CONS" : "PRIM",
 588                     valuename(cl, tag));
 589             if (asprintf (&s, "%s(%s)->u.%s", m->optional ? "" : "&",
 590                           name, m->gen_name) < 0 || s == NULL)
 591                 errx(1, "malloc");
 592             decode_type (s, m->type, m->optional, forwstr, m->gen_name, NULL,
 593                 depth + 1);
 594             fprintf(codefile,
 595                     "(%s)->element = %s;\n",
 596                     name, m->label);
 597             free(s);
 598             fprintf(codefile,
 599                     "}\n");
 600             els = "else ";
 601         }
 602         if (have_ellipsis) {
 603             fprintf(codefile,
 604                     "else {\n"
 605                     "(%s)->u.%s.data = calloc(1, len);\n"
 606                     "if ((%s)->u.%s.data == NULL) {\n"
 607                     "e = ENOMEM; %s;\n"
 608                     "}\n"
 609                     "(%s)->u.%s.length = len;\n"
 610                     "memcpy((%s)->u.%s.data, p, len);\n"
 611                     "(%s)->element = %s;\n"
 612                     "p += len;\n"
 613                     "ret += len;\n"
 614                     "len = 0;\n"
 615                     "}\n",
 616                     name, have_ellipsis->gen_name,
 617                     name, have_ellipsis->gen_name,
 618                     forwstr,
 619                     name, have_ellipsis->gen_name,
 620                     name, have_ellipsis->gen_name,
 621                     name, have_ellipsis->label);
 622         } else {
 623             fprintf(codefile,
 624                     "else {\n"
 625                     "e = ASN1_PARSE_ERROR;\n"
 626                     "%s;\n"
 627                     "}\n",
 628                     forwstr);
 629         }
 630         break;
 631     }
 632     case TUTCTime:
 633         decode_primitive ("utctime", name, forwstr);
 634         break;
 635     case TUTF8String:
 636         decode_primitive ("utf8string", name, forwstr);
 637         break;
 638     case TPrintableString:
 639         decode_primitive ("printable_string", name, forwstr);
 640         break;
 641     case TIA5String:
 642         decode_primitive ("ia5_string", name, forwstr);
 643         break;
 644     case TBMPString:
 645         decode_primitive ("bmp_string", name, forwstr);
 646         break;
 647     case TUniversalString:
 648         decode_primitive ("universal_string", name, forwstr);
 649         break;
 650     case TVisibleString:
 651         decode_primitive ("visible_string", name, forwstr);
 652         break;
 653     case TNull:
 654         fprintf (codefile, "/* NULL */\n");
 655         break;
 656     case TOID:
 657         decode_primitive ("oid", name, forwstr);
 658         break;
 659     default :
 660         abort ();
 661     }
 662     return 0;
 663 }
 664
 665 void
 666 generate_type_decode (const Symbol *s)
 667 {
 668     int preserve = preserve_type(s->name) ? TRUE : FALSE;
 669
 670     fprintf (codefile, "int ASN1CALL\n"
 671              "decode_%s(const unsigned char *p HEIMDAL_UNUSED_ATTRIBUTE,"
 672              " size_t len HEIMDAL_UNUSED_ATTRIBUTE, %s *data, size_t *size)\n"
 673              "{\n",
 674              s->gen_name, s->gen_name);
 675
 676     switch (s->type->type) {
 677     case TInteger:
 678     case TBoolean:
 679     case TOctetString:
 680     case TOID:
 681     case TGeneralizedTime:
 682     case TGeneralString:
 683     case TTeletexString:
 684     case TUTF8String:
 685     case TPrintableString:
 686     case TIA5String:
 687     case TBMPString:
 688     case TUniversalString:
 689     case TVisibleString:
 690     case TUTCTime:
 691     case TNull:
 692     case TEnumerated:
 693     case TBitString:
 694     case TSequence:
 695     case TSequenceOf:
 696     case TSet:
 697     case TSetOf:
 698     case TTag:
 699     case TType:
 700     case TChoice:
 701         fprintf (codefile,
 702                  "size_t ret = 0;\n"
 703                  "size_t l HEIMDAL_UNUSED_ATTRIBUTE;\n"
 704                  "int e HEIMDAL_UNUSED_ATTRIBUTE;\n");
 705         if (preserve)
 706             fprintf (codefile, "const unsigned char *begin = p;\n");
 707
 708         fprintf (codefile, "\n");
 709         fprintf (codefile, "memset(data, 0, sizeof(*data));\n"); /* hack to avoid `unused variable' */
 710
 711         decode_type ("data", s->type, 0, "goto fail", "Top", NULL, 1);
 712         if (preserve)
 713             fprintf (codefile,
 714                      "data->_save.data = calloc(1, ret);\n"
 715                      "if (data->_save.data == NULL) { \n"
 716                      "e = ENOMEM; goto fail; \n"
 717                      "}\n"
 718                      "data->_save.length = ret;\n"
 719                      "memcpy(data->_save.data, begin, ret);\n");
 720         fprintf (codefile,
 721                  "if(size) *size = ret;\n"
 722                  "return 0;\n");
 723         fprintf (codefile,
 724                  "fail:\n"
 725                  "free_%s(data);\n"
 726                  "return e;\n",
 727                  s->gen_name);
 728         break;
 729     default:
 730         abort ();
 731     }
 732     fprintf (codefile, "}\n\n");
 733 }