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
37RCSID("$Id$");
38
39static void
40decode_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
59static void
60find_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
184static void
185range_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
210static int
211decode_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	    /*
246	     * This will produce a worning, how its hard to fix since:
247	     * if its enum to an NameType, we can add appriate
248	     * type-cast. If its not though, we have to figure out if
249	     * there is negative enum enum and use appropriate
250	     * signness and size on the intertype we cast the result
251	     * too.
252	     */
253	    fprintf(codefile,
254		    "{\n"
255		    "int enumint;\n");
256	    decode_primitive ("integer", "&enumint", forwstr);
257	    fprintf(codefile,
258		    "*%s = enumint;\n"
259		    "}\n",
260		    name);
261	} else if (t->range == NULL) {
262	    decode_primitive ("heim_integer", name, forwstr);
263	} else if (t->range->min == INT_MIN && t->range->max == INT_MAX) {
264	    decode_primitive ("integer", name, forwstr);
265	} else if (t->range->min == 0 && t->range->max == UINT_MAX) {
266	    decode_primitive ("unsigned", name, forwstr);
267	} else if (t->range->min == 0 && t->range->max == INT_MAX) {
268	    decode_primitive ("unsigned", name, forwstr);
269	} else
270	    errx(1, "%s: unsupported range %d -> %d",
271		 name, t->range->min, t->range->max);
272	break;
273    case TBoolean:
274      decode_primitive ("boolean", name, forwstr);
275      break;
276    case TEnumerated:
277	decode_primitive ("enumerated", name, forwstr);
278	break;
279    case TOctetString:
280	if (dertype) {
281	    fprintf(codefile,
282		    "if (%s == CONS) {\n",
283		    dertype);
284	    decode_primitive("octet_string_ber", name, forwstr);
285	    fprintf(codefile,
286		    "} else {\n");
287	}
288	decode_primitive ("octet_string", name, forwstr);
289	if (dertype)
290	    fprintf(codefile, "}\n");
291	if (t->range)
292	    range_check(name, "length", forwstr, t->range);
293	break;
294    case TBitString: {
295	Member *m;
296	int pos = 0;
297
298	if (ASN1_TAILQ_EMPTY(t->members)) {
299	    decode_primitive ("bit_string", name, forwstr);
300	    break;
301	}
302	fprintf(codefile,
303		"if (len < 1) return ASN1_OVERRUN;\n"
304		"p++; len--; ret++;\n");
305	fprintf(codefile,
306		"do {\n"
307		"if (len < 1) break;\n");
308	ASN1_TAILQ_FOREACH(m, t->members, members) {
309	    while (m->val / 8 > pos / 8) {
310		fprintf (codefile,
311			 "p++; len--; ret++;\n"
312			 "if (len < 1) break;\n");
313		pos += 8;
314	    }
315	    fprintf (codefile,
316		     "(%s)->%s = (*p >> %d) & 1;\n",
317		     name, m->gen_name, 7 - m->val % 8);
318	}
319	fprintf(codefile,
320		"} while(0);\n");
321	fprintf (codefile,
322		 "p += len; ret += len;\n");
323	break;
324    }
325    case TSequence: {
326	Member *m;
327
328	if (t->members == NULL)
329	    break;
330
331	ASN1_TAILQ_FOREACH(m, t->members, members) {
332	    char *s = NULL;
333
334	    if (m->ellipsis)
335		continue;
336
337	    if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&",
338			  name, m->gen_name) < 0 || s == NULL)
339		errx(1, "malloc");
340	    decode_type (s, m->type, m->optional, forwstr, m->gen_name, NULL,
341		depth + 1);
342	    free (s);
343	}
344
345	break;
346    }
347    case TSet: {
348	Member *m;
349	unsigned int memno;
350
351	if(t->members == NULL)
352	    break;
353
354	fprintf(codefile, "{\n");
355	fprintf(codefile, "unsigned int members = 0;\n");
356	fprintf(codefile, "while(len > 0) {\n");
357	fprintf(codefile,
358		"Der_class class;\n"
359		"Der_type type;\n"
360		"int tag;\n"
361		"e = der_get_tag (p, len, &class, &type, &tag, NULL);\n"
362		"if(e) %s;\n", forwstr);
363	fprintf(codefile, "switch (MAKE_TAG(class, type, tag)) {\n");
364	memno = 0;
365	ASN1_TAILQ_FOREACH(m, t->members, members) {
366	    char *s;
367
368	    assert(m->type->type == TTag);
369
370	    fprintf(codefile, "case MAKE_TAG(%s, %s, %s):\n",
371		    classname(m->type->tag.tagclass),
372		    is_primitive_type(m->type->subtype->type) ? "PRIM" : "CONS",
373		    valuename(m->type->tag.tagclass, m->type->tag.tagvalue));
374
375	    if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name) < 0 || s == NULL)
376		errx(1, "malloc");
377	    if(m->optional)
378		fprintf(codefile,
379			"%s = calloc(1, sizeof(*%s));\n"
380			"if (%s == NULL) { e = ENOMEM; %s; }\n",
381			s, s, s, forwstr);
382	    decode_type (s, m->type, 0, forwstr, m->gen_name, NULL, depth + 1);
383	    free (s);
384
385	    fprintf(codefile, "members |= (1 << %d);\n", memno);
386	    memno++;
387	    fprintf(codefile, "break;\n");
388	}
389	fprintf(codefile,
390		"default:\n"
391		"return ASN1_MISPLACED_FIELD;\n"
392		"break;\n");
393	fprintf(codefile, "}\n");
394	fprintf(codefile, "}\n");
395	memno = 0;
396	ASN1_TAILQ_FOREACH(m, t->members, members) {
397	    char *s;
398
399	    if (asprintf (&s, "%s->%s", name, m->gen_name) < 0 || s == NULL)
400		errx(1, "malloc");
401	    fprintf(codefile, "if((members & (1 << %d)) == 0)\n", memno);
402	    if(m->optional)
403		fprintf(codefile, "%s = NULL;\n", s);
404	    else if(m->defval)
405		gen_assign_defval(s, m->defval);
406	    else
407		fprintf(codefile, "return ASN1_MISSING_FIELD;\n");
408	    free(s);
409	    memno++;
410	}
411	fprintf(codefile, "}\n");
412	break;
413    }
414    case TSetOf:
415    case TSequenceOf: {
416	char *n = NULL;
417	char *sname = NULL;
418
419	fprintf (codefile,
420		 "{\n"
421		 "size_t %s_origlen = len;\n"
422		 "size_t %s_oldret = ret;\n"
423		 "size_t %s_olen = 0;\n"
424		 "void *%s_tmp;\n"
425		 "ret = 0;\n"
426		 "(%s)->len = 0;\n"
427		 "(%s)->val = NULL;\n",
428		 tmpstr,
429		 tmpstr,
430		 tmpstr,
431		 tmpstr,
432		 name,
433		 name);
434
435	fprintf (codefile,
436		 "while(ret < %s_origlen) {\n"
437		 "size_t %s_nlen = %s_olen + sizeof(*((%s)->val));\n"
438		 "if (%s_olen > %s_nlen) { e = ASN1_OVERFLOW; %s; }\n"
439		 "%s_olen = %s_nlen;\n"
440		 "%s_tmp = realloc((%s)->val, %s_olen);\n"
441		 "if (%s_tmp == NULL) { e = ENOMEM; %s; }\n"
442		 "(%s)->val = %s_tmp;\n",
443		 tmpstr,
444		 tmpstr, tmpstr, name,
445		 tmpstr, tmpstr, forwstr,
446		 tmpstr, tmpstr,
447		 tmpstr, name, tmpstr,
448		 tmpstr, forwstr,
449		 name, tmpstr);
450
451	if (asprintf (&n, "&(%s)->val[(%s)->len]", name, name) < 0 || n == NULL)
452	    errx(1, "malloc");
453	if (asprintf (&sname, "%s_s_of", tmpstr) < 0 || sname == NULL)
454	    errx(1, "malloc");
455	decode_type (n, t->subtype, 0, forwstr, sname, NULL, depth + 1);
456	fprintf (codefile,
457		 "(%s)->len++;\n"
458		 "len = %s_origlen - ret;\n"
459		 "}\n"
460		 "ret += %s_oldret;\n"
461		 "}\n",
462		 name,
463		 tmpstr, tmpstr);
464	if (t->range)
465	    range_check(name, "len", forwstr, t->range);
466	free (n);
467	free (sname);
468	break;
469    }
470    case TGeneralizedTime:
471	decode_primitive ("generalized_time", name, forwstr);
472	break;
473    case TGeneralString:
474	decode_primitive ("general_string", name, forwstr);
475	break;
476    case TTeletexString:
477	decode_primitive ("general_string", name, forwstr);
478	break;
479    case TTag:{
480    	char *tname = NULL, *typestring = NULL;
481	char *ide = NULL;
482
483	if (asprintf(&typestring, "%s_type", tmpstr) < 0 || typestring == NULL)
484	    errx(1, "malloc");
485
486	fprintf(codefile,
487		"{\n"
488		"size_t %s_datalen, %s_oldlen;\n"
489		"Der_type %s;\n",
490		tmpstr, tmpstr, typestring);
491	if(support_ber)
492	    fprintf(codefile,
493		    "int is_indefinite%u;\n", depth);
494
495	fprintf(codefile, "e = der_match_tag_and_length(p, len, %s, &%s, %s, "
496		"&%s_datalen, &l);\n",
497		classname(t->tag.tagclass),
498		typestring,
499		valuename(t->tag.tagclass, t->tag.tagvalue),
500		tmpstr);
501
502	/* XXX hardcode for now */
503	if (support_ber && t->subtype->type == TOctetString) {
504	    ide = typestring;
505	} else {
506	    fprintf(codefile,
507		    "if (e == 0 && %s != %s) { e = ASN1_BAD_ID; }\n",
508		    typestring,
509		    is_primitive_type(t->subtype->type) ? "PRIM" : "CONS");
510	}
511
512	if(optional) {
513	    fprintf(codefile,
514		    "if(e) {\n"
515		    "%s = NULL;\n"
516		    "} else {\n"
517		     "%s = calloc(1, sizeof(*%s));\n"
518		     "if (%s == NULL) { e = ENOMEM; %s; }\n",
519		     name, name, name, name, forwstr);
520	} else {
521	    fprintf(codefile, "if(e) %s;\n", forwstr);
522	}
523	fprintf (codefile,
524		 "p += l; len -= l; ret += l;\n"
525		 "%s_oldlen = len;\n",
526		 tmpstr);
527	if(support_ber)
528	    fprintf (codefile,
529		     "if((is_indefinite%u = _heim_fix_dce(%s_datalen, &len)) < 0)\n"
530		     "{ e = ASN1_BAD_FORMAT; %s; }\n"
531		     "if (is_indefinite%u) { if (len < 2) { e = ASN1_OVERRUN; %s; } len -= 2; }",
532		     depth, tmpstr, forwstr, depth, forwstr);
533	else
534	    fprintf(codefile,
535		    "if (%s_datalen > len) { e = ASN1_OVERRUN; %s; }\n"
536		    "len = %s_datalen;\n", tmpstr, forwstr, tmpstr);
537	if (asprintf (&tname, "%s_Tag", tmpstr) < 0 || tname == NULL)
538	    errx(1, "malloc");
539	decode_type (name, t->subtype, 0, forwstr, tname, ide, depth + 1);
540	if(support_ber)
541	    fprintf(codefile,
542		    "if(is_indefinite%u){\n"
543		    "len += 2;\n"
544		    "e = der_match_tag_and_length(p, len, "
545		    "(Der_class)0, &%s, UT_EndOfContent, "
546		    "&%s_datalen, &l);\n"
547		    "if(e) %s;\n"
548		    "p += l; len -= l; ret += l;\n"
549		    "if (%s != (Der_type)0) { e = ASN1_BAD_ID; %s; }\n"
550		    "} else \n",
551		    depth,
552		    typestring,
553		    tmpstr,
554		    forwstr,
555		    typestring, forwstr);
556	fprintf(codefile,
557		"len = %s_oldlen - %s_datalen;\n",
558		tmpstr, tmpstr);
559	if(optional)
560	    fprintf(codefile,
561		    "}\n");
562	fprintf(codefile,
563		"}\n");
564	free(tname);
565	free(typestring);
566	break;
567    }
568    case TChoice: {
569	Member *m, *have_ellipsis = NULL;
570	const char *els = "";
571
572	if (t->members == NULL)
573	    break;
574
575	ASN1_TAILQ_FOREACH(m, t->members, members) {
576	    const Type *tt = m->type;
577	    char *s = NULL;
578	    Der_class cl;
579	    Der_type  ty;
580	    unsigned  tag;
581
582	    if (m->ellipsis) {
583		have_ellipsis = m;
584		continue;
585	    }
586
587	    find_tag(tt, &cl, &ty, &tag);
588
589	    fprintf(codefile,
590		    "%sif (der_match_tag(p, len, %s, %s, %s, NULL) == 0) {\n",
591		    els,
592		    classname(cl),
593		    ty ? "CONS" : "PRIM",
594		    valuename(cl, tag));
595	    if (asprintf (&s, "%s(%s)->u.%s", m->optional ? "" : "&",
596			  name, m->gen_name) < 0 || s == NULL)
597		errx(1, "malloc");
598	    decode_type (s, m->type, m->optional, forwstr, m->gen_name, NULL,
599		depth + 1);
600	    fprintf(codefile,
601		    "(%s)->element = %s;\n",
602		    name, m->label);
603	    free(s);
604	    fprintf(codefile,
605		    "}\n");
606	    els = "else ";
607	}
608	if (have_ellipsis) {
609	    fprintf(codefile,
610		    "else {\n"
611		    "(%s)->u.%s.data = calloc(1, len);\n"
612		    "if ((%s)->u.%s.data == NULL) {\n"
613		    "e = ENOMEM; %s;\n"
614		    "}\n"
615		    "(%s)->u.%s.length = len;\n"
616		    "memcpy((%s)->u.%s.data, p, len);\n"
617		    "(%s)->element = %s;\n"
618		    "p += len;\n"
619		    "ret += len;\n"
620		    "len = 0;\n"
621		    "}\n",
622		    name, have_ellipsis->gen_name,
623		    name, have_ellipsis->gen_name,
624		    forwstr,
625		    name, have_ellipsis->gen_name,
626		    name, have_ellipsis->gen_name,
627		    name, have_ellipsis->label);
628	} else {
629	    fprintf(codefile,
630		    "else {\n"
631		    "(%s)->element = ASN1_CHOICE_INVALID;\n"
632		    "e = ASN1_PARSE_ERROR;\n"
633		    "%s;\n"
634		    "}\n",
635		    name, forwstr);
636	}
637	break;
638    }
639    case TUTCTime:
640	decode_primitive ("utctime", name, forwstr);
641	break;
642    case TUTF8String:
643	decode_primitive ("utf8string", name, forwstr);
644	break;
645    case TPrintableString:
646	decode_primitive ("printable_string", name, forwstr);
647	break;
648    case TIA5String:
649	decode_primitive ("ia5_string", name, forwstr);
650	break;
651    case TBMPString:
652	decode_primitive ("bmp_string", name, forwstr);
653	break;
654    case TUniversalString:
655	decode_primitive ("universal_string", name, forwstr);
656	break;
657    case TVisibleString:
658	decode_primitive ("visible_string", name, forwstr);
659	break;
660    case TNull:
661	fprintf (codefile, "/* NULL */\n");
662	break;
663    case TOID:
664	decode_primitive ("oid", name, forwstr);
665	break;
666    default :
667	abort ();
668    }
669    return 0;
670}
671
672void
673generate_type_decode (const Symbol *s)
674{
675    int preserve = preserve_type(s->name) ? TRUE : FALSE;
676
677    fprintf (codefile, "int ASN1CALL\n"
678	     "decode_%s(const unsigned char *p HEIMDAL_UNUSED_ATTRIBUTE,"
679	     " size_t len HEIMDAL_UNUSED_ATTRIBUTE, %s *data, size_t *size)\n"
680	     "{\n",
681	     s->gen_name, s->gen_name);
682
683    switch (s->type->type) {
684    case TInteger:
685    case TBoolean:
686    case TOctetString:
687    case TOID:
688    case TGeneralizedTime:
689    case TGeneralString:
690    case TTeletexString:
691    case TUTF8String:
692    case TPrintableString:
693    case TIA5String:
694    case TBMPString:
695    case TUniversalString:
696    case TVisibleString:
697    case TUTCTime:
698    case TNull:
699    case TEnumerated:
700    case TBitString:
701    case TSequence:
702    case TSequenceOf:
703    case TSet:
704    case TSetOf:
705    case TTag:
706    case TType:
707    case TChoice:
708	fprintf (codefile,
709		 "size_t ret = 0;\n"
710		 "size_t l HEIMDAL_UNUSED_ATTRIBUTE;\n"
711		 "int e HEIMDAL_UNUSED_ATTRIBUTE;\n");
712	if (preserve)
713	    fprintf (codefile, "const unsigned char *begin = p;\n");
714
715	fprintf (codefile, "\n");
716	fprintf (codefile, "memset(data, 0, sizeof(*data));\n"); /* hack to avoid `unused variable' */
717
718	decode_type ("data", s->type, 0, "goto fail", "Top", NULL, 1);
719	if (preserve)
720	    fprintf (codefile,
721		     "data->_save.data = calloc(1, ret);\n"
722		     "if (data->_save.data == NULL) { \n"
723		     "e = ENOMEM; goto fail; \n"
724		     "}\n"
725		     "data->_save.length = ret;\n"
726		     "memcpy(data->_save.data, begin, ret);\n");
727	fprintf (codefile,
728		 "if(size) *size = ret;\n"
729		 "return 0;\n");
730	fprintf (codefile,
731		 "fail:\n"
732		 "free_%s(data);\n"
733		 "return e;\n",
734		 s->gen_name);
735	break;
736    default:
737	abort ();
738    }
739    fprintf (codefile, "}\n\n");
740}
741