/*
* Sets or resets the 1-based choice variant presence index.
* In case a previous index is not zero, the currently selected structure
* member is freed and zeroed-out first.
* Returns 0 on success and -1 on error.
*/
int
CHOICE_variant_set_presence(const asn_TYPE_descriptor_t *td, void *sptr,
unsigned present) {
const asn_CHOICE_specifics_t *specs =
(const asn_CHOICE_specifics_t *)td->specifics;
unsigned old_present;
if(!sptr) {
return -1;
}
if(present > td->elements_count)
return -1;
old_present =
_fetch_present_idx(sptr, specs->pres_offset, specs->pres_size);
if(present == old_present)
return 0;
if(old_present != 0) {
assert(old_present <= td->elements_count);
ASN_STRUCT_RESET(*td, sptr);
}
_set_present_idx(sptr, specs->pres_offset, specs->pres_size, present);
return 0;
}
asn_random_fill_result_t
CHOICE_random_fill(const asn_TYPE_descriptor_t *td, void **sptr,
const asn_encoding_constraints_t *constr,
size_t max_length) {
const asn_CHOICE_specifics_t *specs =
(const asn_CHOICE_specifics_t *)td->specifics;
asn_random_fill_result_t res;
asn_random_fill_result_t result_failed = {ARFILL_FAILED, 0};
asn_random_fill_result_t result_skipped = {ARFILL_SKIPPED, 0};
const asn_TYPE_member_t *elm;
unsigned present;
void *memb_ptr; /* Pointer to the member */
void **memb_ptr2; /* Pointer to that pointer */
void *st = *sptr;
if(max_length == 0) return result_skipped;
(void)constr;
if(st == NULL) {
st = CALLOC(1, specs->struct_size);
if(st == NULL) {
return result_failed;
}
}
present = asn_random_between(1, td->elements_count);
elm = &td->elements[present - 1];
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;
}
res = elm->type->op->random_fill(elm->type, memb_ptr2,
&elm->encoding_constraints, max_length);
_set_present_idx(st, specs->pres_offset, specs->pres_size, present);
if(res.code == ARFILL_OK) {
*sptr = st;
} else {
if(st == *sptr) {
ASN_STRUCT_RESET(*td, st);
} else {
ASN_STRUCT_FREE(*td, st);
}
}
return res;
}
/*
* The decoder of the CHOICE type.
*/
asn_dec_rval_t
CHOICE_decode_ber(Allocator * allocator, 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_CHOICE_specifics_t *specs = (asn_CHOICE_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 */
ssize_t tag_len; /* Length of TLV's T */
asn_dec_rval_t rval; /* Return code from subparsers */
ssize_t consumed_myself = 0; /* Consumed bytes from ptr */
ASN_DEBUG("Decoding %s as CHOICE", td->name);
/*
* Create the target structure if it is not present already.
*/
if(st == 0) {
st = *struct_ptr = CXX_ALLOC_WRAP 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.
*/
if(tag_mode || td->tags_count) {
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) {
/* ?Substracted below! */
ctx->left += rval.consumed;
}
ADVANCE(rval.consumed);
} else {
ctx->left = -1;
}
NEXT_PHASE(ctx);
ASN_DEBUG("Structure consumes %ld bytes, buffer %ld",
(long)ctx->left, (long)size);
/* Fall through */
case 1:
/*
* Fetch the T from TLV.
*/
tag_len = ber_fetch_tag(ptr, LEFT, &tlv_tag);
ASN_DEBUG("In %s CHOICE tag length %d", td->name, (int)tag_len);
switch(tag_len) {
case 0: if(!SIZE_VIOLATION) RETURN(RC_WMORE);
/* Fall through */
case -1: RETURN(RC_FAIL);
}
do {
const asn_TYPE_tag2member_t *t2m;
asn_TYPE_tag2member_t key;
key.el_tag = tlv_tag;
t2m = (const asn_TYPE_tag2member_t *)bsearch(&key,
specs->tag2el, specs->tag2el_count,
sizeof(specs->tag2el[0]), _search4tag);
if(t2m) {
/*
* Found the element corresponding to the tag.
*/
NEXT_PHASE(ctx);
ctx->step = t2m->el_no;
break;
} else if(specs->ext_start == -1) {
ASN_DEBUG("Unexpected tag %s "
"in non-extensible CHOICE %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);
RETURN(RC_OK);
}
} while(0);
case 2:
/*
* PHASE 2.
* Read in the element.
*/
do {
asn_TYPE_member_t *elm;/* CHOICE's element */
void *memb_ptr; /* Pointer to the member */
void **memb_ptr2; /* Pointer to that pointer */
elm = &elements[ctx->step];
/*
* 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(elm->flags & ATF_POINTER) {
/* Member is a pointer to another structure */
memb_ptr2 = (void **)((char *)st + elm->memb_offset);
} else {
/*
* A pointer to a pointer
* holding the start of the structure
*/
memb_ptr = (char *)st + elm->memb_offset;
memb_ptr2 = &memb_ptr;
}
/* Set presence to be able to free it properly at any time */
_set_present_idx(st, specs->pres_offset,
specs->pres_size, ctx->step + 1);
/*
* Invoke the member fetch routine according to member's type
*/
rval = elm->type->ber_decoder(allocator, opt_codec_ctx, elm->type,
memb_ptr2, ptr, LEFT, elm->tag_mode);
switch(rval.code) {
case RC_OK:
break;
case RC_WMORE: /* More data expected */
if(!SIZE_VIOLATION) {
ADVANCE(rval.consumed);
RETURN(RC_WMORE);
}
RETURN(RC_FAIL);
case RC_FAIL: /* Fatal error */
RETURN(rval.code);
} /* switch(rval) */
ADVANCE(rval.consumed);
} while(0);
NEXT_PHASE(ctx);
/* Fall through */
case 3:
ASN_DEBUG("CHOICE %s Leftover: %ld, size = %ld, tm=%d, tc=%d",
td->name, (long)ctx->left, (long)size,
tag_mode, td->tags_count);
if(ctx->left > 0) {
/*
* The type must be fully decoded
* by the CHOICE member-specific decoder.
*/
RETURN(RC_FAIL);
}
if(ctx->left == -1
&& !(tag_mode || td->tags_count)) {
/*
* This is an untagged CHOICE.
* It doesn't contain nothing
* except for the member itself, including all its tags.
* The decoding is completed.
*/
NEXT_PHASE(ctx);
break;
}
/*
* Read in the "end of data chunks"'s.
*/
while(ctx->left < 0) {
ssize_t tl;
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);
}
/*
* Expected <0><0>...
*/
if(((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++;
continue;
}
} else {
ASN_DEBUG("Unexpected continuation in %s",
td->name);
RETURN(RC_FAIL);
}
/* UNREACHABLE */
}
NEXT_PHASE(ctx);
case 4:
/* No meaningful work here */
break;
}
RETURN(RC_OK);
}
asn_dec_rval_t
CHOICE_decode_uper(Allocator * allocator, asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
asn_CHOICE_specifics_t *specs = (asn_CHOICE_specifics_t *)td->specifics;
asn_dec_rval_t rv;
asn_per_constraint_t *ct;
asn_TYPE_member_t *elm; /* CHOICE's element */
void *memb_ptr;
void **memb_ptr2;
void *st = *sptr;
int value;
if(_ASN_STACK_OVERFLOW_CHECK(opt_codec_ctx))
_ASN_DECODE_FAILED;
/*
* Create the target structure if it is not present already.
*/
if(!st) {
st = *sptr = CXX_ALLOC_WRAP CALLOC(1, specs->struct_size);
if(!st) _ASN_DECODE_FAILED;
}
if(constraints) ct = &constraints->value;
else if(td->per_constraints) ct = &td->per_constraints->value;
else ct = 0;
if(ct && ct->flags & asn_per_constraint_s::APC_EXTENSIBLE) {
value = per_get_few_bits(pd, 1);
if(value < 0) _ASN_DECODE_STARVED;
if(value) ct = 0; /* Not restricted */
}
if(ct && ct->range_bits >= 0) {
value = per_get_few_bits(pd, ct->range_bits);
if(value < 0) _ASN_DECODE_STARVED;
ASN_DEBUG("CHOICE %s got index %d in range %d",
td->name, value, ct->range_bits);
if(value > ct->upper_bound)
_ASN_DECODE_FAILED;
} else {
if(specs->ext_start == -1)
_ASN_DECODE_FAILED;
value = uper_get_nsnnwn(pd);
if(value < 0) _ASN_DECODE_STARVED;
value += specs->ext_start;
if(value >= td->elements_count)
_ASN_DECODE_FAILED;
}
/* Adjust if canonical order is different from natural order */
if(specs->canonical_order)
value = specs->canonical_order[value];
/* Set presence to be able to free it later */
_set_present_idx(st, specs->pres_offset, specs->pres_size, value + 1);
elm = &td->elements[value];
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;
}
ASN_DEBUG("Discovered CHOICE %s encodes %s", td->name, elm->name);
if(ct && ct->range_bits >= 0) {
rv = elm->type->uper_decoder(allocator, opt_codec_ctx, elm->type,
elm->per_constraints, memb_ptr2, pd);
} else {
rv = uper_open_type_get(allocator, opt_codec_ctx, elm->type,
elm->per_constraints, memb_ptr2, pd);
}
if(rv.code != RC_OK)
ASN_DEBUG("Failed to decode %s in %s (CHOICE) %d",
elm->name, td->name, rv.code);
return rv;
}
/*
* Decode the XER (XML) data.
*/
asn_dec_rval_t
CHOICE_decode_xer(Allocator * allocator, 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_CHOICE_specifics_t *specs = (asn_CHOICE_specifics_t *)td->specifics;
const char *xml_tag = opt_mname ? opt_mname : td->xml_tag;
/*
* 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 of 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 = CXX_ALLOC_WRAP CALLOC(1, specs->struct_size);
if(st == 0) RETURN(RC_FAIL);
}
/*
* Restore parsing context.
*/
ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset);
if(ctx->phase == 0 && !*xml_tag)
ctx->phase = 1; /* Skip the outer tag checking phase */
/*
* 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: Only waiting for closing tag.
* Phase 4: Skipping unknown extensions.
* Phase 5: PHASED OUT
*/
for(edx = ctx->step; ctx->phase <= 4;) {
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 member.
*/
if(ctx->phase == 2) {
asn_dec_rval_t tmprval;
void *memb_ptr; /* Pointer to the member */
void **memb_ptr2; /* Pointer to that pointer */
elm = &td->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;
}
/* Start/Continue decoding the inner member */
tmprval = elm->type->xer_decoder(allocator, opt_codec_ctx,
elm->type, memb_ptr2, elm->name,
buf_ptr, size);
XER_ADVANCE(tmprval.consumed);
ASN_DEBUG("XER/CHOICE: itdf: [%s] code=%d",
elm->type->name, tmprval.code);
if(tmprval.code != RC_OK)
RETURN(tmprval.code);
assert(_fetch_present_idx(st,
specs->pres_offset, specs->pres_size) == 0);
/* Record what we've got */
_set_present_idx(st,
specs->pres_offset, specs->pres_size, edx + 1);
ctx->phase = 3;
/* Fall through */
}
/* No need to wait for closing tag; special mode. */
if(ctx->phase == 3 && !*xml_tag) {
ctx->phase = 5; /* Phase out */
RETURN(RC_OK);
}
/*
* 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/CHOICE checked [%c%c%c%c] vs [%s], tcv=%d",
ch_size>0?((const uint8_t *)buf_ptr)[0]:'?',
ch_size>1?((const uint8_t *)buf_ptr)[1]:'?',
ch_size>2?((const uint8_t *)buf_ptr)[2]:'?',
ch_size>3?((const uint8_t *)buf_ptr)[3]:'?',
xml_tag, tcv);
/* Skip the extensions section */
if(ctx->phase == 4) {
ASN_DEBUG("skip_unknown(%d, %ld)",
tcv, (long)ctx->left);
switch(xer_skip_unknown(tcv, &ctx->left)) {
case -1:
ctx->phase = 5;
RETURN(RC_FAIL);
continue;
case 1:
ctx->phase = 3;
/* Fall through */
case 0:
XER_ADVANCE(ch_size);
continue;
case 2:
ctx->phase = 3;
break;
}
}
switch(tcv) {
case XCT_BOTH:
break; /* No CHOICE? */
case XCT_CLOSING:
if(ctx->phase != 3)
break;
XER_ADVANCE(ch_size);
ctx->phase = 5; /* Phase out */
RETURN(RC_OK);
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:
if(ctx->phase != 1)
break; /* Really unexpected */
/*
* Search which inner member corresponds to this tag.
*/
for(edx = 0; edx < td->elements_count; edx++) {
elm = &td->elements[edx];
tcv = xer_check_tag(buf_ptr,ch_size,elm->name);
switch(tcv) {
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->ext_start != -1) {
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 */
ctx->phase = 3; /* Terminating */
} else {
ctx->left = 1;
ctx->phase = 4; /* Skip ...'s */
}
XER_ADVANCE(ch_size);
continue;
}
/* Fall through */
default:
break;
}
ASN_DEBUG("Unexpected XML tag [%c%c%c%c] in CHOICE [%s]"
" (ph=%d, tag=%s)",
ch_size>0?((const uint8_t *)buf_ptr)[0]:'?',
ch_size>1?((const uint8_t *)buf_ptr)[1]:'?',
ch_size>2?((const uint8_t *)buf_ptr)[2]:'?',
ch_size>3?((const uint8_t *)buf_ptr)[3]:'?',
td->name, ctx->phase, xml_tag);
break;
}
ctx->phase = 5; /* Phase out, just in case */
RETURN(RC_FAIL);
}
