source4/heimdal/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 > %d) {\n"
 193                  "e = ASN1_MAX_CONSTRAINT; %s;\n"
 194                  "}\n",
 195                  name, length, r->max, forwstr);
 196     if (r->min - 1 == r->max || r->min < r->max)
 197         fprintf (codefile,
 198                  "if ((%s)->%s < %d) {\n"
 199                  "e = ASN1_MIN_CONSTRAINT; %s;\n"
 200                  "}\n",
 201                  name, length, r->min, forwstr);
 202     if (r->max == r->min)
 203         fprintf (codefile,
 204                  "if ((%s)->%s != %d) {\n"
 205                  "e = ASN1_EXACT_CONSTRAINT; %s;\n"
 206                  "}\n",
 207                  name, length, 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 == INT_MAX) {
 256             decode_primitive ("integer", name, forwstr);
 257         } else if (t->range->min == 0 && t->range->max == UINT_MAX) {
 258             decode_primitive ("unsigned", name, forwstr);
 259         } else if (t->range->min == 0 && t->range->max == INT_MAX) {
 260             decode_primitive ("unsigned", name, forwstr);
 261         } else
 262             errx(1, "%s: unsupported range %d -> %d",
 263                  name, t->range->min, t->range->max);
 264         break;
 265     case TBoolean:
 266       decode_primitive ("boolean", name, forwstr);
 267       break;
 268     case TEnumerated:
 269         decode_primitive ("enumerated", name, forwstr);
 270         break;
 271     case TOctetString:
 272         if (dertype) {
 273             fprintf(codefile,
 274                     "if (%s == CONS) {\n",
 275                     dertype);
 276             decode_primitive("octet_string_ber", name, forwstr);
 277             fprintf(codefile,
 278                     "} else {\n");
 279         }
 280         decode_primitive ("octet_string", name, forwstr);
 281         if (dertype)
 282             fprintf(codefile, "}\n");
 283         if (t->range)
 284             range_check(name, "length", forwstr, t->range);
 285         break;
 286     case TBitString: {
 287         Member *m;
 288         int pos = 0;
 289
 290         if (ASN1_TAILQ_EMPTY(t->members)) {
 291             decode_primitive ("bit_string", name, forwstr);
 292             break;
 293         }
 294         fprintf(codefile,
 295                 "if (len < 1) return ASN1_OVERRUN;\n"
 296                 "p++; len--; ret++;\n");
 297         fprintf(codefile,
 298                 "do {\n"
 299                 "if (len < 1) break;\n");
 300         ASN1_TAILQ_FOREACH(m, t->members, members) {
 301             while (m->val / 8 > pos / 8) {
 302                 fprintf (codefile,
 303                          "p++; len--; ret++;\n"
 304                          "if (len < 1) break;\n");
 305                 pos += 8;
 306             }
 307             fprintf (codefile,
 308                      "(%s)->%s = (*p >> %d) & 1;\n",
 309                      name, m->gen_name, 7 - m->val % 8);
 310         }
 311         fprintf(codefile,
 312                 "} while(0);\n");
 313         fprintf (codefile,
 314                  "p += len; ret += len;\n");
 315         break;
 316     }
 317     case TSequence: {
 318         Member *m;
 319
 320         if (t->members == NULL)
 321             break;
 322
 323         ASN1_TAILQ_FOREACH(m, t->members, members) {
 324             char *s = NULL;
 325
 326             if (m->ellipsis)
 327                 continue;
 328
 329             if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&",
 330                           name, m->gen_name) < 0 || s == NULL)
 331                 errx(1, "malloc");
 332             decode_type (s, m->type, m->optional, forwstr, m->gen_name, NULL,
 333                 depth + 1);
 334             free (s);
 335         }
 336
 337         break;
 338     }
 339     case TSet: {
 340         Member *m;
 341         unsigned int memno;
 342
 343         if(t->members == NULL)
 344             break;
 345
 346         fprintf(codefile, "{\n");
 347         fprintf(codefile, "unsigned int members = 0;\n");
 348         fprintf(codefile, "while(len > 0) {\n");
 349         fprintf(codefile,
 350                 "Der_class class;\n"
 351                 "Der_type type;\n"
 352                 "int tag;\n"
 353                 "e = der_get_tag (p, len, &class, &type, &tag, NULL);\n"
 354                 "if(e) %s;\n", forwstr);
 355         fprintf(codefile, "switch (MAKE_TAG(class, type, tag)) {\n");
 356         memno = 0;
 357         ASN1_TAILQ_FOREACH(m, t->members, members) {
 358             char *s;
 359
 360             assert(m->type->type == TTag);
 361
 362             fprintf(codefile, "case MAKE_TAG(%s, %s, %s):\n",
 363                     classname(m->type->tag.tagclass),
 364                     is_primitive_type(m->type->subtype->type) ? "PRIM" : "CONS",
 365                     valuename(m->type->tag.tagclass, m->type->tag.tagvalue));
 366
 367             if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name) < 0 || s == NULL)
 368                 errx(1, "malloc");
 369             if(m->optional)
 370                 fprintf(codefile,
 371                         "%s = calloc(1, sizeof(*%s));\n"
 372                         "if (%s == NULL) { e = ENOMEM; %s; }\n",
 373                         s, s, s, forwstr);
 374             decode_type (s, m->type, 0, forwstr, m->gen_name, NULL, depth + 1);
 375             free (s);
 376
 377             fprintf(codefile, "members |= (1 << %d);\n", memno);
 378             memno++;
 379             fprintf(codefile, "break;\n");
 380         }
 381         fprintf(codefile,
 382                 "default:\n"
 383                 "return ASN1_MISPLACED_FIELD;\n"
 384                 "break;\n");
 385         fprintf(codefile, "}\n");
 386         fprintf(codefile, "}\n");
 387         memno = 0;
 388         ASN1_TAILQ_FOREACH(m, t->members, members) {
 389             char *s;
 390
 391             if (asprintf (&s, "%s->%s", name, m->gen_name) < 0 || s == NULL)
 392                 errx(1, "malloc");
 393             fprintf(codefile, "if((members & (1 << %d)) == 0)\n", memno);
 394             if(m->optional)
 395                 fprintf(codefile, "%s = NULL;\n", s);
 396             else if(m->defval)
 397                 gen_assign_defval(s, m->defval);
 398             else
 399                 fprintf(codefile, "return ASN1_MISSING_FIELD;\n");
 400             free(s);
 401             memno++;
 402         }
 403         fprintf(codefile, "}\n");
 404         break;
 405     }
 406     case TSetOf:
 407     case TSequenceOf: {
 408         char *n = NULL;
 409         char *sname = NULL;
 410
 411         fprintf (codefile,
 412                  "{\n"
 413                  "size_t %s_origlen = len;\n"
 414                  "size_t %s_oldret = ret;\n"
 415                  "size_t %s_olen = 0;\n"
 416                  "void *%s_tmp;\n"
 417                  "ret = 0;\n"
 418                  "(%s)->len = 0;\n"
 419                  "(%s)->val = NULL;\n",
 420                  tmpstr,
 421                  tmpstr,
 422                  tmpstr,
 423                  tmpstr,
 424                  name,
 425                  name);
 426
 427         fprintf (codefile,
 428                  "while(ret < %s_origlen) {\n"
 429                  "size_t %s_nlen = %s_olen + sizeof(*((%s)->val));\n"
 430                  "if (%s_olen > %s_nlen) { e = ASN1_OVERFLOW; %s; }\n"
 431                  "%s_olen = %s_nlen;\n"
 432                  "%s_tmp = realloc((%s)->val, %s_olen);\n"
 433                  "if (%s_tmp == NULL) { e = ENOMEM; %s; }\n"
 434                  "(%s)->val = %s_tmp;\n",
 435                  tmpstr,
 436                  tmpstr, tmpstr, name,
 437                  tmpstr, tmpstr, forwstr,
 438                  tmpstr, tmpstr,
 439                  tmpstr, name, tmpstr,
 440                  tmpstr, forwstr,
 441                  name, tmpstr);
 442
 443         if (asprintf (&n, "&(%s)->val[(%s)->len]", name, name) < 0 || n == NULL)
 444             errx(1, "malloc");
 445         if (asprintf (&sname, "%s_s_of", tmpstr) < 0 || sname == NULL)
 446             errx(1, "malloc");
 447         decode_type (n, t->subtype, 0, forwstr, sname, NULL, depth + 1);
 448         fprintf (codefile,
 449                  "(%s)->len++;\n"
 450                  "len = %s_origlen - ret;\n"
 451                  "}\n"
 452                  "ret += %s_oldret;\n"
 453                  "}\n",
 454                  name,
 455                  tmpstr, tmpstr);
 456         if (t->range)
 457             range_check(name, "len", forwstr, t->range);
 458         free (n);
 459         free (sname);
 460         break;
 461     }
 462     case TGeneralizedTime:
 463         decode_primitive ("generalized_time", name, forwstr);
 464         break;
 465     case TGeneralString:
 466         decode_primitive ("general_string", name, forwstr);
 467         break;
 468     case TTeletexString:
 469         decode_primitive ("general_string", name, forwstr);
 470         break;
 471     case TTag:{
 472         char *tname = NULL, *typestring = NULL;
 473         char *ide = NULL;
 474
 475         if (asprintf(&typestring, "%s_type", tmpstr) < 0 || typestring == NULL)
 476             errx(1, "malloc");
 477
 478         fprintf(codefile,
 479                 "{\n"
 480                 "size_t %s_datalen, %s_oldlen;\n"
 481                 "Der_type %s;\n",
 482                 tmpstr, tmpstr, typestring);
 483         if(support_ber)
 484             fprintf(codefile,
 485                     "int is_indefinite%u;\n", depth);
 486
 487         fprintf(codefile, "e = der_match_tag_and_length(p, len, %s, &%s, %s, "
 488                 "&%s_datalen, &l);\n",
 489                 classname(t->tag.tagclass),
 490                 typestring,
 491                 valuename(t->tag.tagclass, t->tag.tagvalue),
 492                 tmpstr);
 493
 494         /* XXX hardcode for now */
 495         if (support_ber && t->subtype->type == TOctetString) {
 496             ide = typestring;
 497         } else {
 498             fprintf(codefile,
 499                     "if (e == 0 && %s != %s) { e = ASN1_BAD_ID; }\n",
 500                     typestring,
 501                     is_primitive_type(t->subtype->type) ? "PRIM" : "CONS");
 502         }
 503
 504         if(optional) {
 505             fprintf(codefile,
 506                     "if(e) {\n"
 507                     "%s = NULL;\n"
 508                     "} else {\n"
 509                      "%s = calloc(1, sizeof(*%s));\n"
 510                      "if (%s == NULL) { e = ENOMEM; %s; }\n",
 511                      name, name, name, name, forwstr);
 512         } else {
 513             fprintf(codefile, "if(e) %s;\n", forwstr);
 514         }
 515         fprintf (codefile,
 516                  "p += l; len -= l; ret += l;\n"
 517                  "%s_oldlen = len;\n",
 518                  tmpstr);
 519         if(support_ber)
 520             fprintf (codefile,
 521                      "if((is_indefinite%u = _heim_fix_dce(%s_datalen, &len)) < 0)\n"
 522                      "{ e = ASN1_BAD_FORMAT; %s; }\n"
 523                      "if (is_indefinite%u) { if (len < 2) { e = ASN1_OVERRUN; %s; } len -= 2; }",
 524                      depth, tmpstr, forwstr, depth, forwstr);
 525         else
 526             fprintf(codefile,
 527                     "if (%s_datalen > len) { e = ASN1_OVERRUN; %s; }\n"
 528                     "len = %s_datalen;\n", tmpstr, forwstr, tmpstr);
 529         if (asprintf (&tname, "%s_Tag", tmpstr) < 0 || tname == NULL)
 530             errx(1, "malloc");
 531         decode_type (name, t->subtype, 0, forwstr, tname, ide, depth + 1);
 532         if(support_ber)
 533             fprintf(codefile,
 534                     "if(is_indefinite%u){\n"
 535                     "len += 2;\n"
 536                     "e = der_match_tag_and_length(p, len, "
 537                     "(Der_class)0, &%s, UT_EndOfContent, "
 538                     "&%s_datalen, &l);\n"
 539                     "if(e) %s;\n"
 540                     "p += l; len -= l; ret += l;\n"
 541                     "if (%s != (Der_type)0) { e = ASN1_BAD_ID; %s; }\n"
 542                     "} else \n",
 543                     depth,
 544                     typestring,
 545                     tmpstr,
 546                     forwstr,
 547                     typestring, forwstr);
 548         fprintf(codefile,
 549                 "len = %s_oldlen - %s_datalen;\n",
 550                 tmpstr, tmpstr);
 551         if(optional)
 552             fprintf(codefile,
 553                     "}\n");
 554         fprintf(codefile,
 555                 "}\n");
 556         free(tname);
 557         free(typestring);
 558         break;
 559     }
 560     case TChoice: {
 561         Member *m, *have_ellipsis = NULL;
 562         const char *els = "";
 563
 564         if (t->members == NULL)
 565             break;
 566
 567         ASN1_TAILQ_FOREACH(m, t->members, members) {
 568             const Type *tt = m->type;
 569             char *s = NULL;
 570             Der_class cl;
 571             Der_type  ty;
 572             unsigned  tag;
 573
 574             if (m->ellipsis) {
 575                 have_ellipsis = m;
 576                 continue;
 577             }
 578
 579             find_tag(tt, &cl, &ty, &tag);
 580
 581             fprintf(codefile,
 582                     "%sif (der_match_tag(p, len, %s, %s, %s, NULL) == 0) {\n",
 583                     els,
 584                     classname(cl),
 585                     ty ? "CONS" : "PRIM",
 586                     valuename(cl, tag));
 587             if (asprintf (&s, "%s(%s)->u.%s", m->optional ? "" : "&",
 588                           name, m->gen_name) < 0 || s == NULL)
 589                 errx(1, "malloc");
 590             decode_type (s, m->type, m->optional, forwstr, m->gen_name, NULL,
 591                 depth + 1);
 592             fprintf(codefile,
 593                     "(%s)->element = %s;\n",
 594                     name, m->label);
 595             free(s);
 596             fprintf(codefile,
 597                     "}\n");
 598             els = "else ";
 599         }
 600         if (have_ellipsis) {
 601             fprintf(codefile,
 602                     "else {\n"
 603                     "(%s)->u.%s.data = calloc(1, len);\n"
 604                     "if ((%s)->u.%s.data == NULL) {\n"
 605                     "e = ENOMEM; %s;\n"
 606                     "}\n"
 607                     "(%s)->u.%s.length = len;\n"
 608                     "memcpy((%s)->u.%s.data, p, len);\n"
 609                     "(%s)->element = %s;\n"
 610                     "p += len;\n"
 611                     "ret += len;\n"
 612                     "len = 0;\n"
 613                     "}\n",
 614                     name, have_ellipsis->gen_name,
 615                     name, have_ellipsis->gen_name,
 616                     forwstr,
 617                     name, have_ellipsis->gen_name,
 618                     name, have_ellipsis->gen_name,
 619                     name, have_ellipsis->label);
 620         } else {
 621             fprintf(codefile,
 622                     "else {\n"
 623                     "e = ASN1_PARSE_ERROR;\n"
 624                     "%s;\n"
 625                     "}\n",
 626                     forwstr);
 627         }
 628         break;
 629     }
 630     case TUTCTime:
 631         decode_primitive ("utctime", name, forwstr);
 632         break;
 633     case TUTF8String:
 634         decode_primitive ("utf8string", name, forwstr);
 635         break;
 636     case TPrintableString:
 637         decode_primitive ("printable_string", name, forwstr);
 638         break;
 639     case TIA5String:
 640         decode_primitive ("ia5_string", name, forwstr);
 641         break;
 642     case TBMPString:
 643         decode_primitive ("bmp_string", name, forwstr);
 644         break;
 645     case TUniversalString:
 646         decode_primitive ("universal_string", name, forwstr);
 647         break;
 648     case TVisibleString:
 649         decode_primitive ("visible_string", name, forwstr);
 650         break;
 651     case TNull:
 652         fprintf (codefile, "/* NULL */\n");
 653         break;
 654     case TOID:
 655         decode_primitive ("oid", name, forwstr);
 656         break;
 657     default :
 658         abort ();
 659     }
 660     return 0;
 661 }
 662
 663 void
 664 generate_type_decode (const Symbol *s)
 665 {
 666     int preserve = preserve_type(s->name) ? TRUE : FALSE;
 667
 668     fprintf (codefile, "int ASN1CALL\n"
 669              "decode_%s(const unsigned char *p HEIMDAL_UNUSED_ATTRIBUTE,"
 670              " size_t len HEIMDAL_UNUSED_ATTRIBUTE, %s *data, size_t *size)\n"
 671              "{\n",
 672              s->gen_name, s->gen_name);
 673
 674     switch (s->type->type) {
 675     case TInteger:
 676     case TBoolean:
 677     case TOctetString:
 678     case TOID:
 679     case TGeneralizedTime:
 680     case TGeneralString:
 681     case TTeletexString:
 682     case TUTF8String:
 683     case TPrintableString:
 684     case TIA5String:
 685     case TBMPString:
 686     case TUniversalString:
 687     case TVisibleString:
 688     case TUTCTime:
 689     case TNull:
 690     case TEnumerated:
 691     case TBitString:
 692     case TSequence:
 693     case TSequenceOf:
 694     case TSet:
 695     case TSetOf:
 696     case TTag:
 697     case TType:
 698     case TChoice:
 699         fprintf (codefile,
 700                  "size_t ret = 0;\n"
 701                  "size_t l HEIMDAL_UNUSED_ATTRIBUTE;\n"
 702                  "int e HEIMDAL_UNUSED_ATTRIBUTE;\n");
 703         if (preserve)
 704             fprintf (codefile, "const unsigned char *begin = p;\n");
 705
 706         fprintf (codefile, "\n");
 707         fprintf (codefile, "memset(data, 0, sizeof(*data));\n"); /* hack to avoid `unused variable' */
 708
 709         decode_type ("data", s->type, 0, "goto fail", "Top", NULL, 1);
 710         if (preserve)
 711             fprintf (codefile,
 712                      "data->_save.data = calloc(1, ret);\n"
 713                      "if (data->_save.data == NULL) { \n"
 714                      "e = ENOMEM; goto fail; \n"
 715                      "}\n"
 716                      "data->_save.length = ret;\n"
 717                      "memcpy(data->_save.data, begin, ret);\n");
 718         fprintf (codefile,
 719                  "if(size) *size = ret;\n"
 720                  "return 0;\n");
 721         fprintf (codefile,
 722                  "fail:\n"
 723                  "free_%s(data);\n"
 724                  "return e;\n",
 725                  s->gen_name);
 726         break;
 727     default:
 728         abort ();
 729     }
 730     fprintf (codefile, "}\n\n");
 731 }