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1 /*-
2  * Copyright (c) 2003, 2004, 2005 Lev Walkin <vlm@lionet.info>.
3  * All rights reserved.
4  * Redistribution and modifications are permitted subject to BSD license.
5  */
6 #include <asn_internal.h>
7 #include <constr_SET_OF.h>
8 #include <asn_SET_OF.h>
9
10 /*
11  * Number of bytes left for this structure.
12  * (ctx->left) indicates the number of bytes _transferred_ for the structure.
13  * (size) contains the number of bytes in the buffer passed.
14  */
15 #define LEFT    ((size<(size_t)ctx->left)?size:(size_t)ctx->left)
16
17 /*
18  * If the subprocessor function returns with an indication that it wants
19  * more data, it may well be a fatal decoding problem, because the
20  * size is constrained by the <TLV>'s L, even if the buffer size allows
21  * reading more data.
22  * For example, consider the buffer containing the following TLVs:
23  * <T:5><L:1><V> <T:6>...
24  * The TLV length clearly indicates that one byte is expected in V, but
25  * if the V processor returns with "want more data" even if the buffer
26  * contains way more data than the V processor have seen.
27  */
28 #define SIZE_VIOLATION  (ctx->left >= 0 && (size_t)ctx->left <= size)
29
30 /*
31  * This macro "eats" the part of the buffer which is definitely "consumed",
32  * i.e. was correctly converted into local representation or rightfully skipped.
33  */
34 #undef  ADVANCE
35 #define ADVANCE(num_bytes)      do {            \
36                 size_t num = num_bytes;         \
37                 ptr = ((const char *)ptr) + num;\
38                 size -= num;                    \
39                 if(ctx->left >= 0)              \
40                         ctx->left -= num;       \
41                 consumed_myself += num;         \
42         } while(0)
43
44 /*
45  * Switch to the next phase of parsing.
46  */
47 #undef  NEXT_PHASE
48 #undef  PHASE_OUT
49 #define NEXT_PHASE(ctx) do {                    \
50                 ctx->phase++;                   \
51                 ctx->step = 0;                  \
52         } while(0)
53 #define PHASE_OUT(ctx)  do { ctx->phase = 10; } while(0)
54
55 /*
56  * Return a standardized complex structure.
57  */
58 #undef  RETURN
59 #define RETURN(_code)   do {                    \
60                 rval.code = _code;              \
61                 rval.consumed = consumed_myself;\
62                 return rval;                    \
63         } while(0)
64
65 /*
66  * The decoder of the SET OF type.
67  */
68 asn_dec_rval_t
69 SET_OF_decode_ber(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
70         void **struct_ptr, const void *ptr, size_t size, int tag_mode) {
71         /*
72          * Bring closer parts of structure description.
73          */
74         asn_SET_OF_specifics_t *specs = (asn_SET_OF_specifics_t *)td->specifics;
75         asn_TYPE_member_t *elm = td->elements;  /* Single one */
76
77         /*
78          * Parts of the structure being constructed.
79          */
80         void *st = *struct_ptr; /* Target structure. */
81         asn_struct_ctx_t *ctx;  /* Decoder context */
82
83         ber_tlv_tag_t tlv_tag;  /* T from TLV */
84         asn_dec_rval_t rval;    /* Return code from subparsers */
85
86         ssize_t consumed_myself = 0;    /* Consumed bytes from ptr */
87
88         ASN_DEBUG("Decoding %s as SET OF", td->name);
89         
90         /*
91          * Create the target structure if it is not present already.
92          */
93         if(st == 0) {
94                 st = *struct_ptr = CALLOC(1, specs->struct_size);
95                 if(st == 0) {
96                         RETURN(RC_FAIL);
97                 }
98         }
99
100         /*
101          * Restore parsing context.
102          */
103         ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
104         
105         /*
106          * Start to parse where left previously
107          */
108         switch(ctx->phase) {
109         case 0:
110                 /*
111                  * PHASE 0.
112                  * Check that the set of tags associated with given structure
113                  * perfectly fits our expectations.
114                  */
115
116                 rval = ber_check_tags(opt_codec_ctx, td, ctx, ptr, size,
117                         tag_mode, 1, &ctx->left, 0);
118                 if(rval.code != RC_OK) {
119                         ASN_DEBUG("%s tagging check failed: %d",
120                                 td->name, rval.code);
121                         return rval;
122                 }
123
124                 if(ctx->left >= 0)
125                         ctx->left += rval.consumed; /* ?Substracted below! */
126                 ADVANCE(rval.consumed);
127
128                 ASN_DEBUG("Structure consumes %ld bytes, "
129                         "buffer %ld", (long)ctx->left, (long)size);
130
131                 NEXT_PHASE(ctx);
132                 /* Fall through */
133         case 1:
134                 /*
135                  * PHASE 1.
136                  * From the place where we've left it previously,
137                  * try to decode the next item.
138                  */
139           for(;; ctx->step = 0) {
140                 ssize_t tag_len;        /* Length of TLV's T */
141
142                 if(ctx->step & 1)
143                         goto microphase2;
144
145                 /*
146                  * MICROPHASE 1: Synchronize decoding.
147                  */
148
149                 if(ctx->left == 0) {
150                         ASN_DEBUG("End of SET OF %s", td->name);
151                         /*
152                          * No more things to decode.
153                          * Exit out of here.
154                          */
155                         PHASE_OUT(ctx);
156                         RETURN(RC_OK);
157                 }
158
159                 /*
160                  * Fetch the T from TLV.
161                  */
162                 tag_len = ber_fetch_tag(ptr, LEFT, &tlv_tag);
163                 switch(tag_len) {
164                 case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
165                         /* Fall through */
166                 case -1: RETURN(RC_FAIL);
167                 }
168
169                 if(ctx->left < 0 && ((const uint8_t *)ptr)[0] == 0) {
170                         if(LEFT < 2) {
171                                 if(SIZE_VIOLATION)
172                                         RETURN(RC_FAIL);
173                                 else
174                                         RETURN(RC_WMORE);
175                         } else if(((const uint8_t *)ptr)[1] == 0) {
176                                 /*
177                                  * Found the terminator of the
178                                  * indefinite length structure.
179                                  */
180                                 break;
181                         }
182                 }
183
184                 /* Outmost tag may be unknown and cannot be fetched/compared */
185                 if(elm->tag != (ber_tlv_tag_t)-1) {
186                     if(BER_TAGS_EQUAL(tlv_tag, elm->tag)) {
187                         /*
188                          * The new list member of expected type has arrived.
189                          */
190                     } else {
191                         ASN_DEBUG("Unexpected tag %s fixed SET OF %s",
192                                 ber_tlv_tag_string(tlv_tag), td->name);
193                         ASN_DEBUG("%s SET OF has tag %s",
194                                 td->name, ber_tlv_tag_string(elm->tag));
195                         RETURN(RC_FAIL);
196                     }
197                 }
198
199                 /*
200                  * MICROPHASE 2: Invoke the member-specific decoder.
201                  */
202                 ctx->step |= 1;         /* Confirm entering next microphase */
203         microphase2:
204                 
205                 /*
206                  * Invoke the member fetch routine according to member's type
207                  */
208                 rval = elm->type->ber_decoder(opt_codec_ctx,
209                                 elm->type, &ctx->ptr, ptr, LEFT, 0);
210                 ASN_DEBUG("In %s SET OF %s code %d consumed %d",
211                         td->name, elm->type->name,
212                         rval.code, (int)rval.consumed);
213                 switch(rval.code) {
214                 case RC_OK:
215                         {
216                                 asn_anonymous_set_ *list = _A_SET_FROM_VOID(st);
217                                 if(ASN_SET_ADD(list, ctx->ptr) != 0)
218                                         RETURN(RC_FAIL);
219                                 else
220                                         ctx->ptr = 0;
221                         }
222                         break;
223                 case RC_WMORE: /* More data expected */
224                         if(!SIZE_VIOLATION) {
225                                 ADVANCE(rval.consumed);
226                                 RETURN(RC_WMORE);
227                         }
228                         /* Fall through */
229                 case RC_FAIL: /* Fatal error */
230                         ASN_STRUCT_FREE(*elm->type, ctx->ptr);
231                         ctx->ptr = 0;
232                         RETURN(RC_FAIL);
233                 } /* switch(rval) */
234                 
235                 ADVANCE(rval.consumed);
236           }     /* for(all list members) */
237
238                 NEXT_PHASE(ctx);
239         case 2:
240                 /*
241                  * Read in all "end of content" TLVs.
242                  */
243                 while(ctx->left < 0) {
244                         if(LEFT < 2) {
245                                 if(LEFT > 0 && ((const char *)ptr)[0] != 0) {
246                                         /* Unexpected tag */
247                                         RETURN(RC_FAIL);
248                                 } else {
249                                         RETURN(RC_WMORE);
250                                 }
251                         }
252                         if(((const char *)ptr)[0] == 0
253                         && ((const char *)ptr)[1] == 0) {
254                                 ADVANCE(2);
255                                 ctx->left++;
256                         } else {
257                                 RETURN(RC_FAIL);
258                         }
259                 }
260
261                 PHASE_OUT(ctx);
262         }
263         
264         RETURN(RC_OK);
265 }
266
267 /*
268  * Internally visible buffer holding a single encoded element.
269  */
270 struct _el_buffer {
271         uint8_t *buf;
272         size_t length;
273         size_t size;
274 };
275 /* Append bytes to the above structure */
276 static int _el_addbytes(const void *buffer, size_t size, void *el_buf_ptr) {
277         struct _el_buffer *el_buf = (struct _el_buffer *)el_buf_ptr;
278
279         if(el_buf->length + size > el_buf->size)
280                 return -1;
281
282         memcpy(el_buf->buf + el_buf->length, buffer, size);
283
284         el_buf->length += size;
285         return 0;
286 }
287 static int _el_buf_cmp(const void *ap, const void *bp) {
288         const struct _el_buffer *a = (const struct _el_buffer *)ap;
289         const struct _el_buffer *b = (const struct _el_buffer *)bp;
290         int ret;
291         size_t common_len;
292
293         if(a->length < b->length)
294                 common_len = a->length;
295         else
296                 common_len = b->length;
297
298         ret = memcmp(a->buf, b->buf, common_len);
299         if(ret == 0) {
300                 if(a->length < b->length)
301                         ret = -1;
302                 else if(a->length > b->length)
303                         ret = 1;
304         }
305
306         return ret;
307 }
308
309 /*
310  * The DER encoder of the SET OF type.
311  */
312 asn_enc_rval_t
313 SET_OF_encode_der(asn_TYPE_descriptor_t *td, void *ptr,
314         int tag_mode, ber_tlv_tag_t tag,
315         asn_app_consume_bytes_f *cb, void *app_key) {
316         asn_TYPE_member_t *elm = td->elements;
317         asn_TYPE_descriptor_t *elm_type = elm->type;
318         der_type_encoder_f *der_encoder = elm_type->der_encoder;
319         asn_anonymous_set_ *list = _A_SET_FROM_VOID(ptr);
320         size_t computed_size = 0;
321         ssize_t encoding_size = 0;
322         struct _el_buffer *encoded_els;
323         ssize_t eels_count = 0;
324         size_t max_encoded_len = 1;
325         asn_enc_rval_t erval;
326         int ret;
327         int edx;
328
329         ASN_DEBUG("Estimating size for SET OF %s", td->name);
330
331         /*
332          * Gather the length of the underlying members sequence.
333          */
334         for(edx = 0; edx < list->count; edx++) {
335                 void *memb_ptr = list->array[edx];
336                 if(!memb_ptr) continue;
337                 erval = der_encoder(elm_type, memb_ptr, 0, elm->tag, 0, 0);
338                 if(erval.encoded == -1)
339                         return erval;
340                 computed_size += erval.encoded;
341
342                 /* Compute maximum encoding's size */
343                 if(max_encoded_len < (size_t)erval.encoded)
344                         max_encoded_len = erval.encoded;
345         }
346
347         /*
348          * Encode the TLV for the sequence itself.
349          */
350         encoding_size = der_write_tags(td, computed_size, tag_mode, 1, tag,
351                 cb, app_key);
352         if(encoding_size == -1) {
353                 erval.encoded = -1;
354                 erval.failed_type = td;
355                 erval.structure_ptr = ptr;
356                 return erval;
357         }
358         computed_size += encoding_size;
359
360         if(!cb || list->count == 0) {
361                 erval.encoded = computed_size;
362                 ASN__ENCODED_OK(erval);
363         }
364
365         /*
366          * DER mandates dynamic sorting of the SET OF elements
367          * according to their encodings. Build an array of the
368          * encoded elements.
369          */
370         encoded_els = (struct _el_buffer *)MALLOC(
371                                 list->count * sizeof(encoded_els[0]));
372         if(encoded_els == NULL) {
373                 erval.encoded = -1;
374                 erval.failed_type = td;
375                 erval.structure_ptr = ptr;
376                 return erval;
377         }
378
379         ASN_DEBUG("Encoding members of %s SET OF", td->name);
380
381         /*
382          * Encode all members.
383          */
384         for(edx = 0; edx < list->count; edx++) {
385                 void *memb_ptr = list->array[edx];
386                 struct _el_buffer *encoded_el = &encoded_els[eels_count];
387
388                 if(!memb_ptr) continue;
389
390                 /*
391                  * Prepare space for encoding.
392                  */
393                 encoded_el->buf = (uint8_t *)MALLOC(max_encoded_len);
394                 if(encoded_el->buf) {
395                         encoded_el->length = 0;
396                         encoded_el->size = max_encoded_len;
397                 } else {
398                         for(edx--; edx >= 0; edx--)
399                                 FREEMEM(encoded_els[edx].buf);
400                         FREEMEM(encoded_els);
401                         erval.encoded = -1;
402                         erval.failed_type = td;
403                         erval.structure_ptr = ptr;
404                         return erval;
405                 }
406
407                 /*
408                  * Encode the member into the prepared space.
409                  */
410                 erval = der_encoder(elm_type, memb_ptr, 0, elm->tag,
411                         _el_addbytes, encoded_el);
412                 if(erval.encoded == -1) {
413                         for(; edx >= 0; edx--)
414                                 FREEMEM(encoded_els[edx].buf);
415                         FREEMEM(encoded_els);
416                         return erval;
417                 }
418                 encoding_size += erval.encoded;
419                 eels_count++;
420         }
421
422         /*
423          * Sort the encoded elements according to their encoding.
424          */
425         qsort(encoded_els, eels_count, sizeof(encoded_els[0]), _el_buf_cmp);
426
427         /*
428          * Report encoded elements to the application.
429          * Dispose of temporary sorted members table.
430          */
431         ret = 0;
432         for(edx = 0; edx < eels_count; edx++) {
433                 struct _el_buffer *encoded_el = &encoded_els[edx];
434                 /* Report encoded chunks to the application */
435                 if(ret == 0
436                 && cb(encoded_el->buf, encoded_el->length, app_key) < 0)
437                         ret = -1;
438                 FREEMEM(encoded_el->buf);
439         }
440         FREEMEM(encoded_els);
441
442         if(ret || computed_size != (size_t)encoding_size) {
443                 /*
444                  * Standard callback failed, or
445                  * encoded size is not equal to the computed size.
446                  */
447                 erval.encoded = -1;
448                 erval.failed_type = td;
449                 erval.structure_ptr = ptr;
450         } else {
451                 erval.encoded = computed_size;
452         }
453
454         ASN__ENCODED_OK(erval);
455 }
456
457 #undef  XER_ADVANCE
458 #define XER_ADVANCE(num_bytes)  do {                    \
459                 size_t num = num_bytes;                 \
460                 buf_ptr = ((const char *)buf_ptr) + num;\
461                 size -= num;                            \
462                 consumed_myself += num;                 \
463         } while(0)
464
465 /*
466  * Decode the XER (XML) data.
467  */
468 asn_dec_rval_t
469 SET_OF_decode_xer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
470         void **struct_ptr, const char *opt_mname,
471                 const void *buf_ptr, size_t size) {
472         /*
473          * Bring closer parts of structure description.
474          */
475         asn_SET_OF_specifics_t *specs = (asn_SET_OF_specifics_t *)td->specifics;
476         asn_TYPE_member_t *element = td->elements;
477         const char *elm_tag;
478         const char *xml_tag = opt_mname ? opt_mname : td->xml_tag;
479
480         /*
481          * ... and parts of the structure being constructed.
482          */
483         void *st = *struct_ptr; /* Target structure. */
484         asn_struct_ctx_t *ctx;  /* Decoder context */
485
486         asn_dec_rval_t rval;            /* Return value from a decoder */
487         ssize_t consumed_myself = 0;    /* Consumed bytes from ptr */
488
489         /*
490          * Create the target structure if it is not present already.
491          */
492         if(st == 0) {
493                 st = *struct_ptr = CALLOC(1, specs->struct_size);
494                 if(st == 0) RETURN(RC_FAIL);
495         }
496
497         /* Which tag is expected for the downstream */
498         if(specs->as_XMLValueList) {
499                 elm_tag = (specs->as_XMLValueList == 1) ? 0 : "";
500         } else {
501                 elm_tag = (*element->name)
502                                 ? element->name : element->type->xml_tag;
503         }
504
505         /*
506          * Restore parsing context.
507          */
508         ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
509
510         /*
511          * Phases of XER/XML processing:
512          * Phase 0: Check that the opening tag matches our expectations.
513          * Phase 1: Processing body and reacting on closing tag.
514          * Phase 2: Processing inner type.
515          */
516         for(; ctx->phase <= 2;) {
517                 pxer_chunk_type_e ch_type;      /* XER chunk type */
518                 ssize_t ch_size;                /* Chunk size */
519                 xer_check_tag_e tcv;            /* Tag check value */
520
521                 /*
522                  * Go inside the inner member of a set.
523                  */
524                 if(ctx->phase == 2) {
525                         asn_dec_rval_t tmprval;
526
527                         /* Invoke the inner type decoder, m.b. multiple times */
528                         ASN_DEBUG("XER/SET OF element [%s]", elm_tag);
529                         tmprval = element->type->xer_decoder(opt_codec_ctx,
530                                         element->type, &ctx->ptr, elm_tag,
531                                         buf_ptr, size);
532                         if(tmprval.code == RC_OK) {
533                                 asn_anonymous_set_ *list = _A_SET_FROM_VOID(st);
534                                 if(ASN_SET_ADD(list, ctx->ptr) != 0)
535                                         RETURN(RC_FAIL);
536                                 ctx->ptr = 0;
537                                 XER_ADVANCE(tmprval.consumed);
538                         } else {
539                                 XER_ADVANCE(tmprval.consumed);
540                                 RETURN(tmprval.code);
541                         }
542                         ctx->phase = 1; /* Back to body processing */
543                         ASN_DEBUG("XER/SET OF phase => %d", ctx->phase);
544                         /* Fall through */
545                 }
546
547                 /*
548                  * Get the next part of the XML stream.
549                  */
550                 ch_size = xer_next_token(&ctx->context,
551                         buf_ptr, size, &ch_type);
552                 if(ch_size == -1) {
553             RETURN(RC_FAIL);
554         } else {
555                         switch(ch_type) {
556             case PXER_WMORE:
557                 RETURN(RC_WMORE);
558                         case PXER_COMMENT:      /* Got XML comment */
559                         case PXER_TEXT:         /* Ignore free-standing text */
560                                 XER_ADVANCE(ch_size);   /* Skip silently */
561                                 continue;
562                         case PXER_TAG:
563                                 break;  /* Check the rest down there */
564                         }
565                 }
566
567                 tcv = xer_check_tag(buf_ptr, ch_size, xml_tag);
568                 ASN_DEBUG("XER/SET OF: tcv = %d, ph=%d t=%s",
569                         tcv, ctx->phase, xml_tag);
570                 switch(tcv) {
571                 case XCT_CLOSING:
572                         if(ctx->phase == 0) break;
573                         ctx->phase = 0;
574                         /* Fall through */
575                 case XCT_BOTH:
576                         if(ctx->phase == 0) {
577                                 /* No more things to decode */
578                                 XER_ADVANCE(ch_size);
579                                 ctx->phase = 3; /* Phase out */
580                                 RETURN(RC_OK);
581                         }
582                         /* Fall through */
583                 case XCT_OPENING:
584                         if(ctx->phase == 0) {
585                                 XER_ADVANCE(ch_size);
586                                 ctx->phase = 1; /* Processing body phase */
587                                 continue;
588                         }
589                         /* Fall through */
590                 case XCT_UNKNOWN_OP:
591                 case XCT_UNKNOWN_BO:
592
593                         ASN_DEBUG("XER/SET OF: tcv=%d, ph=%d", tcv, ctx->phase);
594                         if(ctx->phase == 1) {
595                                 /*
596                                  * Process a single possible member.
597                                  */
598                                 ctx->phase = 2;
599                                 continue;
600                         }
601                         /* Fall through */
602                 default:
603                         break;
604                 }
605
606                 ASN_DEBUG("Unexpected XML tag in SET OF");
607                 break;
608         }
609
610         ctx->phase = 3; /* "Phase out" on hard failure */
611         RETURN(RC_FAIL);
612 }
613
614
615
616 typedef struct xer_tmp_enc_s {
617         void *buffer;
618         size_t offset;
619         size_t size;
620 } xer_tmp_enc_t;
621 static int
622 SET_OF_encode_xer_callback(const void *buffer, size_t size, void *key) {
623         xer_tmp_enc_t *t = (xer_tmp_enc_t *)key;
624         if(t->offset + size >= t->size) {
625                 size_t newsize = (t->size << 2) + size;
626                 void *p = REALLOC(t->buffer, newsize);
627                 if(!p) return -1;
628                 t->buffer = p;
629                 t->size = newsize;
630         }
631         memcpy((char *)t->buffer + t->offset, buffer, size);
632         t->offset += size;
633         return 0;
634 }
635 static int
636 SET_OF_xer_order(const void *aptr, const void *bptr) {
637         const xer_tmp_enc_t *a = (const xer_tmp_enc_t *)aptr;
638         const xer_tmp_enc_t *b = (const xer_tmp_enc_t *)bptr;
639         size_t minlen = a->offset;
640         int ret;
641         if(b->offset < minlen) minlen = b->offset;
642         /* Well-formed UTF-8 has this nice lexicographical property... */
643         ret = memcmp(a->buffer, b->buffer, minlen);
644         if(ret != 0) return ret;
645         if(a->offset == b->offset)
646                 return 0;
647         if(a->offset == minlen)
648                 return -1;
649         return 1;
650 }
651
652
653 asn_enc_rval_t
654 SET_OF_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
655         int ilevel, enum xer_encoder_flags_e flags,
656                 asn_app_consume_bytes_f *cb, void *app_key) {
657         asn_enc_rval_t er;
658         asn_SET_OF_specifics_t *specs = (asn_SET_OF_specifics_t *)td->specifics;
659         asn_TYPE_member_t *elm = td->elements;
660         asn_anonymous_set_ *list = _A_SET_FROM_VOID(sptr);
661         const char *mname = specs->as_XMLValueList
662                 ? 0 : ((*elm->name) ? elm->name : elm->type->xml_tag);
663         size_t mlen = mname ? strlen(mname) : 0;
664         int xcan = (flags & XER_F_CANONICAL);
665         xer_tmp_enc_t *encs = 0;
666         size_t encs_count = 0;
667         void *original_app_key = app_key;
668         asn_app_consume_bytes_f *original_cb = cb;
669         int i;
670
671         if(!sptr) ASN__ENCODE_FAILED;
672
673         if(xcan) {
674                 encs = (xer_tmp_enc_t *)MALLOC(list->count * sizeof(encs[0]));
675                 if(!encs) ASN__ENCODE_FAILED;
676                 cb = SET_OF_encode_xer_callback;
677         }
678
679         er.encoded = 0;
680
681         for(i = 0; i < list->count; i++) {
682                 asn_enc_rval_t tmper;
683
684                 void *memb_ptr = list->array[i];
685                 if(!memb_ptr) continue;
686
687                 if(encs) {
688                         memset(&encs[encs_count], 0, sizeof(encs[0]));
689                         app_key = &encs[encs_count];
690                         encs_count++;
691                 }
692
693                 if(mname) {
694                         if(!xcan) ASN__TEXT_INDENT(1, ilevel);
695                         ASN__CALLBACK3("<", 1, mname, mlen, ">", 1);
696                 }
697
698                 if(!xcan && specs->as_XMLValueList == 1)
699                         ASN__TEXT_INDENT(1, ilevel + 1);
700                 tmper = elm->type->xer_encoder(elm->type, memb_ptr,
701                                 ilevel + (specs->as_XMLValueList != 2),
702                                 flags, cb, app_key);
703                 if(tmper.encoded == -1) {
704                         td = tmper.failed_type;
705                         sptr = tmper.structure_ptr;
706                         goto cb_failed;
707                 }
708                 if(tmper.encoded == 0 && specs->as_XMLValueList) {
709                         const char *name = elm->type->xml_tag;
710                         size_t len = strlen(name);
711                         ASN__CALLBACK3("<", 1, name, len, "/>", 2);
712                 }
713
714                 if(mname) {
715                         ASN__CALLBACK3("</", 2, mname, mlen, ">", 1);
716                         er.encoded += 5;
717                 }
718
719                 er.encoded += (2 * mlen) + tmper.encoded;
720         }
721
722         if(!xcan) ASN__TEXT_INDENT(1, ilevel - 1);
723
724         if(encs) {
725                 xer_tmp_enc_t *enc = encs;
726                 xer_tmp_enc_t *end = encs + encs_count;
727                 ssize_t control_size = 0;
728
729                 cb = original_cb;
730                 app_key = original_app_key;
731                 qsort(encs, encs_count, sizeof(encs[0]), SET_OF_xer_order);
732
733                 for(; enc < end; enc++) {
734                         ASN__CALLBACK(enc->buffer, enc->offset);
735                         FREEMEM(enc->buffer);
736                         enc->buffer = 0;
737                         control_size += enc->offset;
738                 }
739                 assert(control_size == er.encoded);
740         }
741
742         goto cleanup;
743 cb_failed:
744         er.encoded = -1;
745         er.failed_type = td;
746         er.structure_ptr = sptr;
747 cleanup:
748         if(encs) {
749                 while(encs_count-- > 0) {
750                         if(encs[encs_count].buffer)
751                                 FREEMEM(encs[encs_count].buffer);
752                 }
753                 FREEMEM(encs);
754         }
755         ASN__ENCODED_OK(er);
756 }
757
758 int
759 SET_OF_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
760                 asn_app_consume_bytes_f *cb, void *app_key) {
761         asn_TYPE_member_t *elm = td->elements;
762         const asn_anonymous_set_ *list = _A_CSET_FROM_VOID(sptr);
763         int ret;
764         int i;
765
766         if(!sptr) return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
767
768         /* Dump preamble */
769         if(cb(td->name, strlen(td->name), app_key) < 0
770         || cb(" ::= {", 6, app_key) < 0)
771                 return -1;
772
773         for(i = 0; i < list->count; i++) {
774                 const void *memb_ptr = list->array[i];
775                 if(!memb_ptr) continue;
776
777                 _i_INDENT(1);
778
779                 ret = elm->type->print_struct(elm->type, memb_ptr,
780                         ilevel + 1, cb, app_key);
781                 if(ret) return ret;
782         }
783
784         ilevel--;
785         _i_INDENT(1);
786
787         return (cb("}", 1, app_key) < 0) ? -1 : 0;
788 }
789
790 void
791 SET_OF_free(asn_TYPE_descriptor_t *td, void *ptr, int contents_only) {
792         if(td && ptr) {
793                 asn_SET_OF_specifics_t *specs;
794                 asn_TYPE_member_t *elm = td->elements;
795                 asn_anonymous_set_ *list = _A_SET_FROM_VOID(ptr);
796                 asn_struct_ctx_t *ctx;  /* Decoder context */
797                 int i;
798
799                 /*
800                  * Could not use set_of_empty() because of (*free)
801                  * incompatibility.
802                  */
803                 for(i = 0; i < list->count; i++) {
804                         void *memb_ptr = list->array[i];
805                         if(memb_ptr)
806                         ASN_STRUCT_FREE(*elm->type, memb_ptr);
807                 }
808                 list->count = 0;        /* No meaningful elements left */
809
810                 asn_set_empty(list);    /* Remove (list->array) */
811
812                 specs = (asn_SET_OF_specifics_t *)td->specifics;
813                 ctx = (asn_struct_ctx_t *)((char *)ptr + specs->ctx_offset);
814                 if(ctx->ptr) {
815                         ASN_STRUCT_FREE(*elm->type, ctx->ptr);
816                         ctx->ptr = 0;
817                 }
818
819                 if(!contents_only) {
820                         FREEMEM(ptr);
821                 }
822         }
823 }
824
825 int
826 SET_OF_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
827                 asn_app_constraint_failed_f *ctfailcb, void *app_key) {
828         asn_TYPE_member_t *elm = td->elements;
829         asn_constr_check_f *constr;
830         const asn_anonymous_set_ *list = _A_CSET_FROM_VOID(sptr);
831         int i;
832
833         if(!sptr) {
834                 ASN__CTFAIL(app_key, td, sptr,
835                         "%s: value not given (%s:%d)",
836                         td->name, __FILE__, __LINE__);
837                 return -1;
838         }
839
840         constr = elm->memb_constraints;
841         if(!constr) constr = elm->type->check_constraints;
842
843         /*
844          * Iterate over the members of an array.
845          * Validate each in turn, until one fails.
846          */
847         for(i = 0; i < list->count; i++) {
848                 const void *memb_ptr = list->array[i];
849                 int ret;
850
851                 if(!memb_ptr) continue;
852
853                 ret = constr(elm->type, memb_ptr, ctfailcb, app_key);
854                 if(ret) return ret;
855         }
856
857         /*
858          * Cannot inherit it eralier:
859          * need to make sure we get the updated version.
860          */
861         if(!elm->memb_constraints)
862                 elm->memb_constraints = elm->type->check_constraints;
863
864         return 0;
865 }
866
867 asn_dec_rval_t
868 SET_OF_decode_uper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
869         asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
870         asn_dec_rval_t rv;
871         asn_SET_OF_specifics_t *specs = (asn_SET_OF_specifics_t *)td->specifics;
872         asn_TYPE_member_t *elm = td->elements;  /* Single one */
873         void *st = *sptr;
874         asn_anonymous_set_ *list;
875         asn_per_constraint_t *ct;
876         int repeat = 0;
877         ssize_t nelems;
878
879         if(ASN__STACK_OVERFLOW_CHECK(opt_codec_ctx))
880                 ASN__DECODE_FAILED;
881
882         /*
883          * Create the target structure if it is not present already.
884          */
885         if(!st) {
886                 st = *sptr = CALLOC(1, specs->struct_size);
887                 if(!st) ASN__DECODE_FAILED;
888         }                                                                       
889         list = _A_SET_FROM_VOID(st);
890
891         /* Figure out which constraints to use */
892         if(constraints) ct = &constraints->size;
893         else if(td->per_constraints) ct = &td->per_constraints->size;
894         else ct = 0;
895
896         if(ct && ct->flags & APC_EXTENSIBLE) {
897                 int value = per_get_few_bits(pd, 1);
898                 if(value < 0) ASN__DECODE_STARVED;
899                 if(value) ct = 0;       /* Not restricted! */
900         }
901
902         if(ct && ct->effective_bits >= 0) {
903                 /* X.691, #19.5: No length determinant */
904                 nelems = per_get_few_bits(pd, ct->effective_bits);
905                 ASN_DEBUG("Preparing to fetch %ld+%ld elements from %s",
906                         (long)nelems, ct->lower_bound, td->name);
907                 if(nelems < 0)  ASN__DECODE_STARVED;
908                 nelems += ct->lower_bound;
909         } else {
910                 nelems = -1;
911         }
912
913         do {
914                 int i;
915                 if(nelems < 0) {
916                         nelems = uper_get_length(pd,
917                                 ct ? ct->effective_bits : -1, &repeat);
918                         ASN_DEBUG("Got to decode %d elements (eff %d)",
919                                 (int)nelems, (int)(ct ? ct->effective_bits : -1));
920                         if(nelems < 0) ASN__DECODE_STARVED;
921                 }
922
923                 for(i = 0; i < nelems; i++) {
924                         void *ptr = 0;
925                         ASN_DEBUG("SET OF %s decoding", elm->type->name);
926                         rv = elm->type->uper_decoder(opt_codec_ctx, elm->type,
927                                 elm->per_constraints, &ptr, pd);
928                         ASN_DEBUG("%s SET OF %s decoded %d, %p",
929                                 td->name, elm->type->name, rv.code, ptr);
930                         if(rv.code == RC_OK) {
931                                 if(ASN_SET_ADD(list, ptr) == 0)
932                                         continue;
933                                 ASN_DEBUG("Failed to add element into %s",
934                                         td->name);
935                                 /* Fall through */
936                                 rv.code = RC_FAIL;
937                         } else {
938                                 ASN_DEBUG("Failed decoding %s of %s (SET OF)",
939                                         elm->type->name, td->name);
940                         }
941                         if(ptr) ASN_STRUCT_FREE(*elm->type, ptr);
942                         return rv;
943                 }
944
945                 nelems = -1;    /* Allow uper_get_length() */
946         } while(repeat);
947
948         ASN_DEBUG("Decoded %s as SET OF", td->name);
949
950         rv.code = RC_OK;
951         rv.consumed = 0;
952         return rv;
953 }
954