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constr_SET.c

/*-
 * Copyright (c) 2003, 2004, 2005, 2006 Lev Walkin <vlm@lionet.info>.
 * All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <constr_SET.h>

/* Check that all the mandatory members are present */
static int _SET_is_populated(asn_TYPE_descriptor_t *td, void *st);

/*
 * Number of bytes left for this structure.
 * (ctx->left) indicates the number of bytes _transferred_ for the structure.
 * (size) contains the number of bytes in the buffer passed.
 */
#define     LEFT  ((size<(size_t)ctx->left)?size:(size_t)ctx->left)

/*
 * If the subprocessor function returns with an indication that it wants
 * more data, it may well be a fatal decoding problem, because the
 * size is constrained by the <TLV>'s L, even if the buffer size allows
 * reading more data.
 * For example, consider the buffer containing the following TLVs:
 * <T:5><L:1><V> <T:6>...
 * The TLV length clearly indicates that one byte is expected in V, but
 * if the V processor returns with "want more data" even if the buffer
 * contains way more data than the V processor have seen.
 */
#define     SIZE_VIOLATION    (ctx->left >= 0 && (size_t)ctx->left <= size)

/*
 * This macro "eats" the part of the buffer which is definitely "consumed",
 * i.e. was correctly converted into local representation or rightfully skipped.
 */
#undef      ADVANCE
#define     ADVANCE(num_bytes)      do {        \
            size_t num = num_bytes;       \
            ptr = ((const char *)ptr) + num;\
            size -= num;                  \
            if(ctx->left >= 0)            \
                  ctx->left -= num; \
            consumed_myself += num;       \
      } while(0)

/*
 * Switch to the next phase of parsing.
 */
#undef      NEXT_PHASE
#define     NEXT_PHASE(ctx)   do {              \
            ctx->phase++;                 \
            ctx->step = 0;                \
      } while(0)

/*
 * Return a standardized complex structure.
 */
#undef      RETURN
#define     RETURN(_code)     do {              \
            rval.code = _code;            \
            rval.consumed = consumed_myself;\
            return rval;                  \
      } while(0)

/*
 * Tags are canonically sorted in the tag2element map.
 */
static int
_t2e_cmp(const void *ap, const void *bp) {
      const asn_TYPE_tag2member_t *a = (const asn_TYPE_tag2member_t *)ap;
      const asn_TYPE_tag2member_t *b = (const asn_TYPE_tag2member_t *)bp;

      int a_class = BER_TAG_CLASS(a->el_tag);
      int b_class = BER_TAG_CLASS(b->el_tag);

      if(a_class == b_class) {
            ber_tlv_tag_t a_value = BER_TAG_VALUE(a->el_tag);
            ber_tlv_tag_t b_value = BER_TAG_VALUE(b->el_tag);

            if(a_value == b_value)
                  return 0;
            else if(a_value < b_value)
                  return -1;
            else
                  return 1;
      } else if(a_class < b_class) {
            return -1;
      } else {
            return 1;
      }
}

/*
 * The decoder of the SET type.
 */
asn_dec_rval_t
SET_decode_ber(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
      void **struct_ptr, const void *ptr, size_t size, int tag_mode) {
      /*
       * Bring closer parts of structure description.
       */
      asn_SET_specifics_t *specs = (asn_SET_specifics_t *)td->specifics;
      asn_TYPE_member_t *elements = td->elements;

      /*
       * Parts of the structure being constructed.
       */
      void *st = *struct_ptr; /* Target structure. */
      asn_struct_ctx_t *ctx;  /* Decoder context */

      ber_tlv_tag_t tlv_tag;  /* T from TLV */
      asn_dec_rval_t rval;    /* Return code from subparsers */

      ssize_t consumed_myself = 0;  /* Consumed bytes from ptr */
      int edx;                /* SET element's index */

      ASN_DEBUG("Decoding %s as SET", td->name);

      if(_ASN_STACK_OVERFLOW_CHECK(opt_codec_ctx))
            _ASN_DECODE_FAILED;

      /*
       * Create the target structure if it is not present already.
       */
      if(st == 0) {
            st = *struct_ptr = CALLOC(1, specs->struct_size);
            if(st == 0) {
                  RETURN(RC_FAIL);
            }
      }

      /*
       * Restore parsing context.
       */
      ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
      
      /*
       * Start to parse where left previously
       */
      switch(ctx->phase) {
      case 0:
            /*
             * PHASE 0.
             * Check that the set of tags associated with given structure
             * perfectly fits our expectations.
             */

            rval = ber_check_tags(opt_codec_ctx, td, ctx, ptr, size,
                  tag_mode, 1, &ctx->left, 0);
            if(rval.code != RC_OK) {
                  ASN_DEBUG("%s tagging check failed: %d",
                        td->name, rval.code);
                  return rval;
            }

            if(ctx->left >= 0)
                  ctx->left += rval.consumed; /* ?Substracted below! */
            ADVANCE(rval.consumed);

            NEXT_PHASE(ctx);

            ASN_DEBUG("Structure advertised %ld bytes, "
                  "buffer contains %ld", (long)ctx->left, (long)size);

            /* Fall through */
      case 1:
            /*
             * PHASE 1.
             * From the place where we've left it previously,
             * try to decode the next member from the list of
             * this structure's elements.
             * Note that elements in BER may arrive out of
             * order, yet DER mandates that they shall arive in the
             * canonical order of their tags. So, there is a room
             * for optimization.
             */
        for(;; ctx->step = 0) {
            asn_TYPE_tag2member_t *t2m;
            asn_TYPE_tag2member_t key;
            void *memb_ptr;         /* Pointer to the member */
            void **memb_ptr2; /* Pointer to that pointer */
            ssize_t tag_len;  /* Length of TLV's T */

            if(ctx->step & 1) {
                  edx = ctx->step >> 1;
                  goto microphase2;
            }

            /*
             * MICROPHASE 1: Synchronize decoding.
             */

            if(ctx->left == 0)
                  /*
                   * No more things to decode.
                   * Exit out of here and check whether all mandatory
                   * elements have been received (in the next phase).
                   */
                  break;

            /*
             * Fetch the T from TLV.
             */
            tag_len = ber_fetch_tag(ptr, LEFT, &tlv_tag);
            switch(tag_len) {
            case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
                  /* Fall through */
            case -1: RETURN(RC_FAIL);
            }

            if(ctx->left < 0 && ((const uint8_t *)ptr)[0] == 0) {
                  if(LEFT < 2) {
                        if(SIZE_VIOLATION)
                              RETURN(RC_FAIL);
                        else
                              RETURN(RC_WMORE);
                  } else if(((const uint8_t *)ptr)[1] == 0) {
                        /*
                         * Found the terminator of the
                         * indefinite length structure.
                         * Invoke the generic finalization function.
                         */
                        goto phase3;
                  }
            }

            key.el_tag = tlv_tag;
            t2m = (asn_TYPE_tag2member_t *)bsearch(&key,
                        specs->tag2el, specs->tag2el_count,
                        sizeof(specs->tag2el[0]), _t2e_cmp);
            if(t2m) {
                  /*
                   * Found the element corresponding to the tag.
                   */
                  edx = t2m->el_no;
                  ctx->step = (edx << 1) + 1;
                  ASN_DEBUG("Got tag %s (%s), edx %d",
                        ber_tlv_tag_string(tlv_tag), td->name, edx);
            } else if(specs->extensible == 0) {
                  ASN_DEBUG("Unexpected tag %s "
                        "in non-extensible SET %s",
                        ber_tlv_tag_string(tlv_tag), td->name);
                  RETURN(RC_FAIL);
            } else {
                  /* Skip this tag */
                  ssize_t skip;

                  ASN_DEBUG("Skipping unknown tag %s",
                        ber_tlv_tag_string(tlv_tag));

                  skip = ber_skip_length(opt_codec_ctx,
                        BER_TLV_CONSTRUCTED(ptr),
                        (const char *)ptr + tag_len, LEFT - tag_len);

                  switch(skip) {
                  case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
                        /* Fall through */
                  case -1: RETURN(RC_FAIL);
                  }

                  ADVANCE(skip + tag_len);
                  continue;  /* Try again with the next tag */
            }

            /*
             * MICROPHASE 2: Invoke the member-specific decoder.
             */
      microphase2:

            /*
             * Check for duplications: must not overwrite
             * already decoded elements.
             */
            if(ASN_SET_ISPRESENT2((char *)st + specs->pres_offset, edx)) {
                  ASN_DEBUG("SET %s: Duplicate element %s (%d)",
                        td->name, elements[edx].name, edx);
                  RETURN(RC_FAIL);
            }
            
            /*
             * Compute the position of the member inside a structure,
             * and also a type of containment (it may be contained
             * as pointer or using inline inclusion).
             */
            if(elements[edx].flags & ATF_POINTER) {
                  /* Member is a pointer to another structure */
                  memb_ptr2 = (void **)((char *)st + elements[edx].memb_offset);
            } else {
                  /*
                   * A pointer to a pointer
                   * holding the start of the structure
                   */
                  memb_ptr = (char *)st + elements[edx].memb_offset;
                  memb_ptr2 = &memb_ptr;
            }
            /*
             * Invoke the member fetch routine according to member's type
             */
            rval = elements[edx].type->ber_decoder(opt_codec_ctx,
                        elements[edx].type,
                        memb_ptr2, ptr, LEFT,
                        elements[edx].tag_mode);
            switch(rval.code) {
            case RC_OK:
                  ASN_SET_MKPRESENT((char *)st + specs->pres_offset, edx);
                  break;
            case RC_WMORE: /* More data expected */
                  if(!SIZE_VIOLATION) {
                        ADVANCE(rval.consumed);
                        RETURN(RC_WMORE);
                  }
                  /* Fail through */
            case RC_FAIL: /* Fatal error */
                  RETURN(RC_FAIL);
            } /* switch(rval) */
            
            ADVANCE(rval.consumed);
        }   /* for(all structure members) */

      phase3:
            ctx->phase = 3;
            /* Fall through */
      case 3:
      case 4:     /* Only 00 is expected */
            ASN_DEBUG("SET %s Leftover: %ld, size = %ld",
                  td->name, (long)ctx->left, (long)size);

            /*
             * Skip everything until the end of the SET.
             */
            while(ctx->left) {
                  ssize_t tl, ll;

                  tl = ber_fetch_tag(ptr, LEFT, &tlv_tag);
                  switch(tl) {
                  case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
                        /* Fall through */
                  case -1: RETURN(RC_FAIL);
                  }

                  /*
                   * If expected <0><0>...
                   */
                  if(ctx->left < 0
                        && ((const uint8_t *)ptr)[0] == 0) {
                        if(LEFT < 2) {
                              if(SIZE_VIOLATION)
                                    RETURN(RC_FAIL);
                              else
                                    RETURN(RC_WMORE);
                        } else if(((const uint8_t *)ptr)[1] == 0) {
                              /*
                               * Correctly finished with <0><0>.
                               */
                              ADVANCE(2);
                              ctx->left++;
                              ctx->phase = 4;
                              continue;
                        }
                  }

                  if(specs->extensible == 0 || ctx->phase == 4) {
                        ASN_DEBUG("Unexpected continuation "
                              "of a non-extensible type %s "
                              "(ptr=%02x)",
                              td->name, *(const uint8_t *)ptr);
                        RETURN(RC_FAIL);
                  }

                  ll = ber_skip_length(opt_codec_ctx,
                        BER_TLV_CONSTRUCTED(ptr),
                        (const char *)ptr + tl, LEFT - tl);
                  switch(ll) {
                  case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
                        /* Fall through */
                  case -1: RETURN(RC_FAIL);
                  }

                  ADVANCE(tl + ll);
            }

            ctx->phase = 5;
      case 5:
            /* Check that all mandatory elements are present. */
            if(!_SET_is_populated(td, st))
                  RETURN(RC_FAIL);

            NEXT_PHASE(ctx);
      }
      
      RETURN(RC_OK);
}

static int
_SET_is_populated(asn_TYPE_descriptor_t *td, void *st) {
      asn_SET_specifics_t *specs = (asn_SET_specifics_t *)td->specifics;
      int edx;

      /*
       * Check that all mandatory elements are present.
       */
      for(edx = 0; edx < td->elements_count;
            edx += (8 * sizeof(specs->_mandatory_elements[0]))) {
            unsigned int midx, pres, must;

            midx = edx/(8 * sizeof(specs->_mandatory_elements[0]));
            pres = ((unsigned int *)((char *)st+specs->pres_offset))[midx];
            must = sys_ntohl(specs->_mandatory_elements[midx]);

            if((pres & must) == must) {
                  /*
                   * Yes, everything seems to be in place.
                   */
            } else {
                  ASN_DEBUG("One or more mandatory elements "
                        "of a SET %s %d (%08x.%08x)=%08x "
                        "are not present",
                        td->name,
                        midx,
                        pres,
                        must,
                        (~(pres & must) & must)
                  );
                  return 0;
            }
      }

      return 1;
}

/*
 * The DER encoder of the SET type.
 */
asn_enc_rval_t
SET_encode_der(asn_TYPE_descriptor_t *td,
      void *sptr, int tag_mode, ber_tlv_tag_t tag,
      asn_app_consume_bytes_f *cb, void *app_key) {
      asn_SET_specifics_t *specs = (asn_SET_specifics_t *)td->specifics;
      size_t computed_size = 0;
      asn_enc_rval_t er;
      int t2m_build_own = (specs->tag2el_count != td->elements_count);
      asn_TYPE_tag2member_t *t2m;
      int t2m_count;
      ssize_t ret;
      int edx;

      /*
       * Use existing, or build our own tags map.
       */
      if(t2m_build_own) {
            t2m = (asn_TYPE_tag2member_t *)alloca(
                        td->elements_count * sizeof(t2m[0]));
            if(!t2m) _ASN_ENCODE_FAILED; /* There are such platforms */
            t2m_count = 0;
      } else {
            /*
             * There is no untagged CHOICE in this SET.
             * Employ existing table.
             */
            t2m = specs->tag2el;
            t2m_count = specs->tag2el_count;
      }

      /*
       * Gather the length of the underlying members sequence.
       */
      for(edx = 0; edx < td->elements_count; edx++) {
            asn_TYPE_member_t *elm = &td->elements[edx];
            asn_enc_rval_t tmper;
            void *memb_ptr;

            /*
             * Compute the length of the encoding of this member.
             */
            if(elm->flags & ATF_POINTER) {
                  memb_ptr = *(void **)((char *)sptr + elm->memb_offset);
                  if(!memb_ptr) {
                        if(!elm->optional)
                              /* Mandatory elements missing */
                              _ASN_ENCODE_FAILED;
                        if(t2m_build_own) {
                              t2m[t2m_count].el_no = edx;
                              t2m[t2m_count].el_tag = 0;
                              t2m_count++;
                        }
                        continue;
                  }
            } else {
                  memb_ptr = (void *)((char *)sptr + elm->memb_offset);
            }
            tmper = elm->type->der_encoder(elm->type, memb_ptr,
                  elm->tag_mode, elm->tag,
                  0, 0);
            if(tmper.encoded == -1)
                  return tmper;
            computed_size += tmper.encoded;

            /*
             * Remember the outmost tag of this member.
             */
            if(t2m_build_own) {
                  t2m[t2m_count].el_no = edx;
                  t2m[t2m_count].el_tag = asn_TYPE_outmost_tag(
                        elm->type, memb_ptr, elm->tag_mode, elm->tag);
                  t2m_count++;
            } else {
                  /*
                   * No dynamic sorting is necessary.
                   */
            }
      }

      /*
       * Finalize order of the components.
       */
      assert(t2m_count == td->elements_count);
      if(t2m_build_own) {
            /*
             * Sort the underlying members according to their
             * canonical tags order. DER encoding mandates it.
             */
            qsort(t2m, t2m_count, sizeof(specs->tag2el[0]), _t2e_cmp);
      } else {
            /*
             * Tags are already sorted by the compiler.
             */
      }

      /*
       * Encode the TLV for the sequence itself.
       */
      ret = der_write_tags(td, computed_size, tag_mode, 1, tag, cb, app_key);
      if(ret == -1) _ASN_ENCODE_FAILED;
      er.encoded = computed_size + ret;

      if(!cb) _ASN_ENCODED_OK(er);

      /*
       * Encode all members.
       */
      for(edx = 0; edx < td->elements_count; edx++) {
            asn_TYPE_member_t *elm;
            asn_enc_rval_t tmper;
            void *memb_ptr;

            /* Encode according to the tag order */
            elm = &td->elements[t2m[edx].el_no];

            if(elm->flags & ATF_POINTER) {
                  memb_ptr = *(void **)((char *)sptr + elm->memb_offset);
                  if(!memb_ptr) continue;
            } else {
                  memb_ptr = (void *)((char *)sptr + elm->memb_offset);
            }
            tmper = elm->type->der_encoder(elm->type, memb_ptr,
                  elm->tag_mode, elm->tag,
                  cb, app_key);
            if(tmper.encoded == -1)
                  return tmper;
            computed_size -= tmper.encoded;
      }

      if(computed_size != 0) {
            /*
             * Encoded size is not equal to the computed size.
             */
            _ASN_ENCODE_FAILED;
      }

      _ASN_ENCODED_OK(er);
}

#undef      XER_ADVANCE
#define     XER_ADVANCE(num_bytes)  do {              \
            size_t num = num_bytes;             \
            buf_ptr = ((const char *)buf_ptr) + num;\
            size -= num;                        \
            consumed_myself += num;             \
      } while(0)

/*
 * Decode the XER (XML) data.
 */
asn_dec_rval_t
SET_decode_xer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
      void **struct_ptr, const char *opt_mname,
            const void *buf_ptr, size_t size) {
      /*
       * Bring closer parts of structure description.
       */
      asn_SET_specifics_t *specs = (asn_SET_specifics_t *)td->specifics;
      asn_TYPE_member_t *elements = td->elements;
      const char *xml_tag = opt_mname ? opt_mname : td->xml_tag;

      /*
       * ... and parts of the structure being constructed.
       */
      void *st = *struct_ptr; /* Target structure. */
      asn_struct_ctx_t *ctx;  /* Decoder context */

      asn_dec_rval_t rval;          /* Return value from a decoder */
      ssize_t consumed_myself = 0;  /* Consumed bytes from ptr */
      int edx;                /* Element index */

      /*
       * Create the target structure if it is not present already.
       */
      if(st == 0) {
            st = *struct_ptr = CALLOC(1, specs->struct_size);
            if(st == 0) RETURN(RC_FAIL);
      }

      /*
       * Restore parsing context.
       */
      ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);

      /*
       * Phases of XER/XML processing:
       * Phase 0: Check that the opening tag matches our expectations.
       * Phase 1: Processing body and reacting on closing tag.
       * Phase 2: Processing inner type.
       * Phase 3: Skipping unknown extensions.
       * Phase 4: PHASED OUT
       */
      for(edx = ctx->step; ctx->phase <= 3;) {
            pxer_chunk_type_e ch_type;    /* XER chunk type */
            ssize_t ch_size;        /* Chunk size */
            xer_check_tag_e tcv;          /* Tag check value */
            asn_TYPE_member_t *elm;

            /*
             * Go inside the inner member of a set.
             */
            if(ctx->phase == 2) {
                  asn_dec_rval_t tmprval;
                  void *memb_ptr;         /* Pointer to the member */
                  void **memb_ptr2; /* Pointer to that pointer */

                  if(ASN_SET_ISPRESENT2((char *)st + specs->pres_offset,
                              edx)) {
                        ASN_DEBUG("SET %s: Duplicate element %s (%d)",
                        td->name, elements[edx].name, edx);
                        RETURN(RC_FAIL);
                  }

                  elm = &elements[edx];

                  if(elm->flags & ATF_POINTER) {
                        /* Member is a pointer to another structure */
                        memb_ptr2 = (void **)((char *)st
                              + elm->memb_offset);
                  } else {
                        memb_ptr = (char *)st + elm->memb_offset;
                        memb_ptr2 = &memb_ptr;
                  }

                  /* Invoke the inner type decoder, m.b. multiple times */
                  tmprval = elm->type->xer_decoder(opt_codec_ctx,
                              elm->type, memb_ptr2, elm->name,
                              buf_ptr, size);
                  XER_ADVANCE(tmprval.consumed);
                  if(tmprval.code != RC_OK)
                        RETURN(tmprval.code);
                  ctx->phase = 1;   /* Back to body processing */
                  ASN_SET_MKPRESENT((char *)st + specs->pres_offset, edx);
                  ASN_DEBUG("XER/SET phase => %d", ctx->phase);
                  /* Fall through */
            }

            /*
             * Get the next part of the XML stream.
             */
            ch_size = xer_next_token(&ctx->context,
                  buf_ptr, size, &ch_type);
            switch(ch_size) {
            case -1: RETURN(RC_FAIL);
            case 0:  RETURN(RC_WMORE);
            default:
                  switch(ch_type) {
                  case PXER_COMMENT:      /* Got XML comment */
                  case PXER_TEXT:         /* Ignore free-standing text */
                        XER_ADVANCE(ch_size);   /* Skip silently */
                        continue;
                  case PXER_TAG:
                        break;      /* Check the rest down there */
                  }
            }

            tcv = xer_check_tag(buf_ptr, ch_size, xml_tag);
            ASN_DEBUG("XER/SET: tcv = %d, ph=%d", tcv, ctx->phase);

            /* Skip the extensions section */
            if(ctx->phase == 3) {
                  switch(xer_skip_unknown(tcv, &ctx->left)) {
                  case -1:
                        ctx->phase = 4;
                        RETURN(RC_FAIL);
                  case 1:
                        ctx->phase = 1;
                        /* Fall through */
                  case 0:
                        XER_ADVANCE(ch_size);
                        continue;
                  case 2:
                        ctx->phase = 1;
                        break;
                  }
            }

            switch(tcv) {
            case XCT_CLOSING:
                  if(ctx->phase == 0) break;
                  ctx->phase = 0;
                  /* Fall through */
            case XCT_BOTH:
                  if(ctx->phase == 0) {
                        if(_SET_is_populated(td, st)) {
                              XER_ADVANCE(ch_size);
                              ctx->phase = 4;   /* Phase out */
                              RETURN(RC_OK);
                        } else {
                              ASN_DEBUG("Premature end of XER SET");
                              RETURN(RC_FAIL);
                        }
                  }
                  /* Fall through */
            case XCT_OPENING:
                  if(ctx->phase == 0) {
                        XER_ADVANCE(ch_size);
                        ctx->phase = 1;   /* Processing body phase */
                        continue;
                  }
                  /* Fall through */
            case XCT_UNKNOWN_OP:
            case XCT_UNKNOWN_BO:

                  ASN_DEBUG("XER/SET: tcv=%d, ph=%d", tcv, ctx->phase);
                  if(ctx->phase != 1)
                        break;      /* Really unexpected */

                  /*
                   * Search which member corresponds to this tag.
                   */
                  for(edx = 0; edx < td->elements_count; edx++) {
                        switch(xer_check_tag(buf_ptr, ch_size,
                              elements[edx].name)) {
                        case XCT_BOTH:
                        case XCT_OPENING:
                              /*
                               * Process this member.
                               */
                              ctx->step = edx;
                              ctx->phase = 2;
                              break;
                        case XCT_UNKNOWN_OP:
                        case XCT_UNKNOWN_BO:
                              continue;
                        default:
                              edx = td->elements_count;
                              break;      /* Phase out */
                        }
                        break;
                  }
                  if(edx != td->elements_count)
                        continue;

                  /* It is expected extension */
                  if(specs->extensible) {
                        ASN_DEBUG("Got anticipated extension");
                        /*
                         * Check for (XCT_BOTH or XCT_UNKNOWN_BO)
                         * By using a mask. Only record a pure
                         * <opening> tags.
                         */
                        if(tcv & XCT_CLOSING) {
                              /* Found </extension> without body */
                        } else {
                              ctx->left = 1;
                              ctx->phase = 3;   /* Skip ...'s */
                        }
                        XER_ADVANCE(ch_size);
                        continue;
                  }

                  /* Fall through */
            default:
                  break;
            }

            ASN_DEBUG("Unexpected XML tag in SET, expected \"%s\"",
                  xml_tag);
            break;
      }

      ctx->phase = 4;   /* "Phase out" on hard failure */
      RETURN(RC_FAIL);
}

asn_enc_rval_t
SET_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
      int ilevel, enum xer_encoder_flags_e flags,
            asn_app_consume_bytes_f *cb, void *app_key) {
      asn_SET_specifics_t *specs = (asn_SET_specifics_t *)td->specifics;
      asn_enc_rval_t er;
      int xcan = (flags & XER_F_CANONICAL);
      asn_TYPE_tag2member_t *t2m = specs->tag2el_cxer;
      int t2m_count = specs->tag2el_cxer_count;
      int edx;

      if(!sptr)
            _ASN_ENCODE_FAILED;

      assert(t2m_count == td->elements_count);

      er.encoded = 0;

      for(edx = 0; edx < t2m_count; edx++) {
            asn_enc_rval_t tmper;
            asn_TYPE_member_t *elm;
            void *memb_ptr;
            const char *mname;
            unsigned int mlen;

            elm = &td->elements[t2m[edx].el_no];
            mname = elm->name;
            mlen = strlen(elm->name);

            if(elm->flags & ATF_POINTER) {
                  memb_ptr = *(void **)((char *)sptr + elm->memb_offset);
                  if(!memb_ptr) {
                        if(elm->optional)
                              continue;
                        /* Mandatory element missing */
                        _ASN_ENCODE_FAILED;
                  }
            } else {
                  memb_ptr = (void *)((char *)sptr + elm->memb_offset);
            }

            if(!xcan)
                  _i_ASN_TEXT_INDENT(1, ilevel);
            _ASN_CALLBACK3("<", 1, mname, mlen, ">", 1);

            /* Print the member itself */
            tmper = elm->type->xer_encoder(elm->type, memb_ptr,
                        ilevel + 1, flags, cb, app_key);
            if(tmper.encoded == -1) return tmper;

            _ASN_CALLBACK3("</", 2, mname, mlen, ">", 1);

            er.encoded += 5 + (2 * mlen) + tmper.encoded;
      }

      if(!xcan) _i_ASN_TEXT_INDENT(1, ilevel - 1);

      _ASN_ENCODED_OK(er);
cb_failed:
      _ASN_ENCODE_FAILED;
}

int
SET_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
            asn_app_consume_bytes_f *cb, void *app_key) {
      int edx;
      int ret;

      if(!sptr) return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;

      /* Dump preamble */
      if(cb(td->name, strlen(td->name), app_key) < 0
      || cb(" ::= {", 6, app_key) < 0)
            return -1;

      for(edx = 0; edx < td->elements_count; edx++) {
            asn_TYPE_member_t *elm = &td->elements[edx];
            const void *memb_ptr;

            if(elm->flags & ATF_POINTER) {
                  memb_ptr = *(const void * const *)((const char *)sptr + elm->memb_offset);
                  if(!memb_ptr) {
                        if(elm->optional) continue;
                        /* Print <absent> line */
                        /* Fall through */
                  }
            } else {
                  memb_ptr = (const void *)((const char *)sptr + elm->memb_offset);
            }

            _i_INDENT(1);

            /* Print the member's name and stuff */
            if(cb(elm->name, strlen(elm->name), app_key) < 0
            || cb(": ", 2, app_key) < 0)
                  return -1;

            /* Print the member itself */
            ret = elm->type->print_struct(elm->type, memb_ptr, ilevel + 1,
                  cb, app_key);
            if(ret) return ret;
      }

      ilevel--;
      _i_INDENT(1);

      return (cb("}", 1, app_key) < 0) ? -1 : 0;
}

void
SET_free(asn_TYPE_descriptor_t *td, void *ptr, int contents_only) {
      int edx;

      if(!td || !ptr)
            return;

      ASN_DEBUG("Freeing %s as SET", td->name);

      for(edx = 0; edx < td->elements_count; edx++) {
            asn_TYPE_member_t *elm = &td->elements[edx];
            void *memb_ptr;
            if(elm->flags & ATF_POINTER) {
                  memb_ptr = *(void **)((char *)ptr + elm->memb_offset);
                  if(memb_ptr)
                        ASN_STRUCT_FREE(*elm->type, memb_ptr);
            } else {
                  memb_ptr = (void *)((char *)ptr + elm->memb_offset);
                  ASN_STRUCT_FREE_CONTENTS_ONLY(*elm->type, memb_ptr);
            }
      }

      if(!contents_only) {
            FREEMEM(ptr);
      }
}

int
SET_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
            asn_app_constraint_failed_f *ctfailcb, void *app_key) {
      int edx;

      if(!sptr) {
            _ASN_CTFAIL(app_key, td, sptr,
                  "%s: value not given (%s:%d)",
                  td->name, __FILE__, __LINE__);
            return -1;
      }

      /*
       * Iterate over structure members and check their validity.
       */
      for(edx = 0; edx < td->elements_count; edx++) {
            asn_TYPE_member_t *elm = &td->elements[edx];
            const void *memb_ptr;

            if(elm->flags & ATF_POINTER) {
                  memb_ptr = *(const void * const *)((const char *)sptr + elm->memb_offset);
                  if(!memb_ptr) {
                        if(elm->optional)
                              continue;
                        _ASN_CTFAIL(app_key, td, sptr,
                        "%s: mandatory element %s absent (%s:%d)",
                        td->name, elm->name, __FILE__, __LINE__);
                        return -1;
                  }
            } else {
                  memb_ptr = (const void *)((const char *)sptr + elm->memb_offset);
            }

            if(elm->memb_constraints) {
                  int ret = elm->memb_constraints(elm->type, memb_ptr,
                        ctfailcb, app_key);
                  if(ret) return ret;
            } else {
                  int ret = elm->type->check_constraints(elm->type,
                        memb_ptr, ctfailcb, app_key);
                  if(ret) return ret;
                  /*
                   * Cannot inherit it earlier:
                   * need to make sure we get the updated version.
                   */
                  elm->memb_constraints = elm->type->check_constraints;
            }
      }

      return 0;
}

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