libs/smux/constr_SET_OF.c

   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