source: heimdal/trunk/lib/asn1/gen_decode.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 17.9 KB
Line 
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 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
663void
664generate_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}
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