2 * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
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37 RCSID("$Id: gen_decode.c 21503 2007-07-12 11:57:19Z lha $");
40 decode_primitive (const char *typename, const char *name, const char *forwstr)
44 "e = decode_%s(p, len, %s, &l);\n"
51 "e = der_get_%s(p, len, %s, &l);\n"
52 "if(e) %s;\np += l; len -= l; ret += l;\n",
60 is_primitive_type(int type)
68 case TGeneralizedTime:
73 case TPrintableString:
76 case TUniversalString:
86 find_tag (const Type *t,
87 Der_class *cl, Der_type *ty, unsigned *tag)
101 errx(1, "Cannot have recursive CHOICE");
105 *tag = UT_Enumerated;
110 *tag = UT_GeneralString;
112 case TGeneralizedTime:
115 *tag = UT_GeneralizedTime;
140 *tag = UT_OctetString;
142 case TPrintableString:
145 *tag = UT_PrintableString;
160 *cl = t->tag.tagclass;
161 *ty = is_primitive_type(t->subtype->type) ? PRIM : CONS;
162 *tag = t->tag.tagvalue;
165 if ((t->symbol->stype == Stype && t->symbol->type == NULL)
166 || t->symbol->stype == SUndefined) {
167 error_message("%s is imported or still undefined, "
168 " can't generate tag checking data in CHOICE "
169 "without this information",
173 find_tag(t->symbol->type, cl, ty, tag);
183 *tag = UT_UTF8String;
190 case TUniversalString:
193 *tag = UT_UniversalString;
198 *tag = UT_VisibleString;
206 range_check(const char *name,
211 if (r->min == r->max + 2 || r->min < r->max)
213 "if ((%s)->%s > %d) {\n"
214 "e = ASN1_MAX_CONSTRAINT; %s;\n"
216 name, length, r->max, forwstr);
217 if (r->min - 1 == r->max || r->min < r->max)
219 "if ((%s)->%s < %d) {\n"
220 "e = ASN1_MIN_CONSTRAINT; %s;\n"
222 name, length, r->min, forwstr);
223 if (r->max == r->min)
225 "if ((%s)->%s != %d) {\n"
226 "e = ASN1_EXACT_CONSTRAINT; %s;\n"
228 name, length, r->min, forwstr);
232 decode_type (const char *name, const Type *t, int optional,
233 const char *forwstr, const char *tmpstr)
239 "%s = calloc(1, sizeof(*%s));\n"
240 "if (%s == NULL) %s;\n",
241 name, name, name, forwstr);
243 "e = decode_%s(p, len, %s, &l);\n",
244 t->symbol->gen_name, name);
251 "p += l; len -= l; ret += l;\n"
259 "p += l; len -= l; ret += l;\n");
268 decode_primitive ("integer", "&enumint", forwstr);
273 } else if (t->range == NULL) {
274 decode_primitive ("heim_integer", name, forwstr);
275 } else if (t->range->min == INT_MIN && t->range->max == INT_MAX) {
276 decode_primitive ("integer", name, forwstr);
277 } else if (t->range->min == 0 && t->range->max == UINT_MAX) {
278 decode_primitive ("unsigned", name, forwstr);
279 } else if (t->range->min == 0 && t->range->max == INT_MAX) {
280 decode_primitive ("unsigned", name, forwstr);
282 errx(1, "%s: unsupported range %d -> %d",
283 name, t->range->min, t->range->max);
286 decode_primitive ("boolean", name, forwstr);
289 decode_primitive ("enumerated", name, forwstr);
292 decode_primitive ("octet_string", name, forwstr);
294 range_check(name, "length", forwstr, t->range);
300 if (ASN1_TAILQ_EMPTY(t->members)) {
301 decode_primitive ("bit_string", name, forwstr);
305 "if (len < 1) return ASN1_OVERRUN;\n"
306 "p++; len--; ret++;\n");
309 "if (len < 1) break;\n");
310 ASN1_TAILQ_FOREACH(m, t->members, members) {
311 while (m->val / 8 > pos / 8) {
313 "p++; len--; ret++;\n"
314 "if (len < 1) break;\n");
318 "(%s)->%s = (*p >> %d) & 1;\n",
319 name, m->gen_name, 7 - m->val % 8);
324 "p += len; ret += len;\n");
330 if (t->members == NULL)
333 ASN1_TAILQ_FOREACH(m, t->members, members) {
339 asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&",
343 decode_type (s, m->type, m->optional, forwstr, m->gen_name);
353 if(t->members == NULL)
356 fprintf(codefile, "{\n");
357 fprintf(codefile, "unsigned int members = 0;\n");
358 fprintf(codefile, "while(len > 0) {\n");
363 "e = der_get_tag (p, len, &class, &type, &tag, NULL);\n"
364 "if(e) %s;\n", forwstr);
365 fprintf(codefile, "switch (MAKE_TAG(class, type, tag)) {\n");
367 ASN1_TAILQ_FOREACH(m, t->members, members) {
370 assert(m->type->type == TTag);
372 fprintf(codefile, "case MAKE_TAG(%s, %s, %s):\n",
373 classname(m->type->tag.tagclass),
374 is_primitive_type(m->type->subtype->type) ? "PRIM" : "CONS",
375 valuename(m->type->tag.tagclass, m->type->tag.tagvalue));
377 asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name);
382 "%s = calloc(1, sizeof(*%s));\n"
383 "if (%s == NULL) { e = ENOMEM; %s; }\n",
385 decode_type (s, m->type, 0, forwstr, m->gen_name);
388 fprintf(codefile, "members |= (1 << %d);\n", memno);
390 fprintf(codefile, "break;\n");
394 "return ASN1_MISPLACED_FIELD;\n"
396 fprintf(codefile, "}\n");
397 fprintf(codefile, "}\n");
399 ASN1_TAILQ_FOREACH(m, t->members, members) {
402 asprintf (&s, "%s->%s", name, m->gen_name);
405 fprintf(codefile, "if((members & (1 << %d)) == 0)\n", memno);
407 fprintf(codefile, "%s = NULL;\n", s);
409 gen_assign_defval(s, m->defval);
411 fprintf(codefile, "return ASN1_MISSING_FIELD;\n");
415 fprintf(codefile, "}\n");
425 "size_t %s_origlen = len;\n"
426 "size_t %s_oldret = ret;\n"
427 "size_t %s_olen = 0;\n"
431 "(%s)->val = NULL;\n",
440 "while(ret < %s_origlen) {\n"
441 "size_t %s_nlen = %s_olen + sizeof(*((%s)->val));\n"
442 "if (%s_olen > %s_nlen) { e = ASN1_OVERFLOW; %s; }\n"
443 "%s_olen = %s_nlen;\n"
444 "%s_tmp = realloc((%s)->val, %s_olen);\n"
445 "if (%s_tmp == NULL) { e = ENOMEM; %s; }\n"
446 "(%s)->val = %s_tmp;\n",
448 tmpstr, tmpstr, name,
449 tmpstr, tmpstr, forwstr,
451 tmpstr, name, tmpstr,
455 asprintf (&n, "&(%s)->val[(%s)->len]", name, name);
458 asprintf (&sname, "%s_s_of", tmpstr);
461 decode_type (n, t->subtype, 0, forwstr, sname);
464 "len = %s_origlen - ret;\n"
466 "ret += %s_oldret;\n"
471 range_check(name, "len", forwstr, t->range);
476 case TGeneralizedTime:
477 decode_primitive ("generalized_time", name, forwstr);
480 decode_primitive ("general_string", name, forwstr);
487 "size_t %s_datalen, %s_oldlen;\n",
492 fprintf(codefile, "e = der_match_tag_and_length(p, len, %s, %s, %s, "
493 "&%s_datalen, &l);\n",
494 classname(t->tag.tagclass),
495 is_primitive_type(t->subtype->type) ? "PRIM" : "CONS",
496 valuename(t->tag.tagclass, t->tag.tagvalue),
503 "%s = calloc(1, sizeof(*%s));\n"
504 "if (%s == NULL) { e = ENOMEM; %s; }\n",
505 name, name, name, name, forwstr);
507 fprintf(codefile, "if(e) %s;\n", forwstr);
510 "p += l; len -= l; ret += l;\n"
511 "%s_oldlen = len;\n",
515 "if((dce_fix = _heim_fix_dce(%s_datalen, &len)) < 0)\n"
516 "{ e = ASN1_BAD_FORMAT; %s; }\n",
520 "if (%s_datalen > len) { e = ASN1_OVERRUN; %s; }\n"
521 "len = %s_datalen;\n", tmpstr, forwstr, tmpstr);
522 asprintf (&tname, "%s_Tag", tmpstr);
525 decode_type (name, t->subtype, 0, forwstr, tname);
529 "e = der_match_tag_and_length (p, len, "
530 "(Der_class)0,(Der_type)0, UT_EndOfContent, "
531 "&%s_datalen, &l);\n"
532 "if(e) %s;\np += l; len -= l; ret += l;\n"
533 "} else \n", tmpstr, forwstr);
535 "len = %s_oldlen - %s_datalen;\n",
546 Member *m, *have_ellipsis = NULL;
547 const char *els = "";
549 if (t->members == NULL)
552 ASN1_TAILQ_FOREACH(m, t->members, members) {
553 const Type *tt = m->type;
564 find_tag(tt, &cl, &ty, &tag);
567 "%sif (der_match_tag(p, len, %s, %s, %s, NULL) == 0) {\n",
570 ty ? "CONS" : "PRIM",
572 asprintf (&s, "%s(%s)->u.%s", m->optional ? "" : "&",
576 decode_type (s, m->type, m->optional, forwstr, m->gen_name);
578 "(%s)->element = %s;\n",
588 "(%s)->u.%s.data = calloc(1, len);\n"
589 "if ((%s)->u.%s.data == NULL) {\n"
592 "(%s)->u.%s.length = len;\n"
593 "memcpy((%s)->u.%s.data, p, len);\n"
594 "(%s)->element = %s;\n"
599 name, have_ellipsis->gen_name,
600 name, have_ellipsis->gen_name,
602 name, have_ellipsis->gen_name,
603 name, have_ellipsis->gen_name,
604 name, have_ellipsis->label);
608 "e = ASN1_PARSE_ERROR;\n"
616 decode_primitive ("utctime", name, forwstr);
619 decode_primitive ("utf8string", name, forwstr);
621 case TPrintableString:
622 decode_primitive ("printable_string", name, forwstr);
625 decode_primitive ("ia5_string", name, forwstr);
628 decode_primitive ("bmp_string", name, forwstr);
630 case TUniversalString:
631 decode_primitive ("universal_string", name, forwstr);
634 decode_primitive ("visible_string", name, forwstr);
637 fprintf (codefile, "/* NULL */\n");
640 decode_primitive ("oid", name, forwstr);
649 generate_type_decode (const Symbol *s)
651 int preserve = preserve_type(s->name) ? TRUE : FALSE;
655 "decode_%s(const unsigned char *, size_t, %s *, size_t *);\n",
656 s->gen_name, s->gen_name);
658 fprintf (codefile, "int\n"
659 "decode_%s(const unsigned char *p,"
660 " size_t len, %s *data, size_t *size)\n"
662 s->gen_name, s->gen_name);
664 switch (s->type->type) {
669 case TGeneralizedTime:
672 case TPrintableString:
675 case TUniversalString:
693 fprintf (codefile, "const unsigned char *begin = p;\n");
695 fprintf (codefile, "\n");
696 fprintf (codefile, "memset(data, 0, sizeof(*data));\n"); /* hack to avoid `unused variable' */
698 decode_type ("data", s->type, 0, "goto fail", "Top");
701 "data->_save.data = calloc(1, ret);\n"
702 "if (data->_save.data == NULL) { \n"
703 "e = ENOMEM; goto fail; \n"
705 "data->_save.length = ret;\n"
706 "memcpy(data->_save.data, begin, ret);\n");
708 "if(size) *size = ret;\n"
719 fprintf (codefile, "}\n\n");