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/*
* Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
* All rights reserved.
* Redistribution and modifications are permitted subject to BSD license.
*/
#ifndef ASN_DISABLE_OER_SUPPORT
#include <asn_internal.h>
#include <OCTET_STRING.h>
#include <errno.h>
asn_dec_rval_t
OCTET_STRING_decode_oer(const asn_codec_ctx_t *opt_codec_ctx,
const asn_TYPE_descriptor_t *td,
const asn_oer_constraints_t *constraints, void **sptr,
const void *ptr, size_t size) {
const asn_OCTET_STRING_specifics_t *specs =
td->specifics ? (const asn_OCTET_STRING_specifics_t *)td->specifics
: &asn_SPC_OCTET_STRING_specs;
OCTET_STRING_t *st = (OCTET_STRING_t *)*sptr;
const asn_oer_constraints_t *cts =
constraints ? constraints : td->encoding_constraints.oer_constraints;
ssize_t ct_size = cts ? cts->size : -1;
asn_dec_rval_t rval = {RC_OK, 0};
size_t expected_length = 0;
size_t unit_bytes;
switch(specs->subvariant) {
default:
case ASN_OSUBV_BIT:
ASN_DEBUG("Invalid use of OCTET STRING to decode BIT STRING");
ASN__DECODE_FAILED;
case ASN_OSUBV_ANY:
/* Fall through */
case ASN_OSUBV_STR:
unit_bytes = 1;
break;
case ASN_OSUBV_U16:
unit_bytes = 2;
break;
case ASN_OSUBV_U32:
unit_bytes = 4;
break;
}
(void)opt_codec_ctx;
if(!st) {
st = (OCTET_STRING_t *)(*sptr = CALLOC(1, specs->struct_size));
if(!st) ASN__DECODE_FAILED;
}
if(ct_size >= 0) {
expected_length = unit_bytes * ct_size;
} else {
/*
* X.696 (08/2015) #27.2
* Encode length determinant as _number of octets_, but only
* if upper bound is not equal to lower bound.
*/
ssize_t len_len = oer_fetch_length(ptr, size, &expected_length);
if(len_len > 0) {
rval.consumed = len_len;
ptr = (const char *)ptr + len_len;
size -= len_len;
} else if(len_len == 0) {
ASN__DECODE_STARVED;
} else if(len_len < 0) {
ASN__DECODE_FAILED;
}
if(expected_length % unit_bytes != 0) {
ASN_DEBUG(
"Data size %" ASN_PRI_SIZE " bytes is not consistent with multiplier %" ASN_PRI_SIZE "",
expected_length, unit_bytes);
ASN__DECODE_FAILED;
}
}
if(size < expected_length) {
ASN__DECODE_STARVED;
} else {
uint8_t *buf = MALLOC(expected_length + 1);
if(buf == NULL) {
ASN__DECODE_FAILED;
} else {
memcpy(buf, ptr, expected_length);
buf[expected_length] = '\0';
}
FREEMEM(st->buf);
st->buf = buf;
st->size = expected_length;
rval.consumed += expected_length;
return rval;
}
}
/*
* Encode as Canonical OER.
*/
asn_enc_rval_t
OCTET_STRING_encode_oer(const asn_TYPE_descriptor_t *td,
const asn_oer_constraints_t *constraints,
const void *sptr, asn_app_consume_bytes_f *cb,
void *app_key) {
const asn_OCTET_STRING_specifics_t *specs =
td->specifics ? (const asn_OCTET_STRING_specifics_t *)td->specifics
: &asn_SPC_OCTET_STRING_specs;
const OCTET_STRING_t *st = (const OCTET_STRING_t *)sptr;
const asn_oer_constraints_t *cts =
constraints ? constraints : td->encoding_constraints.oer_constraints;
ssize_t ct_size = cts ? cts->size : -1;
asn_enc_rval_t er = {0, 0, 0};
if(!st) ASN__ENCODE_FAILED;
ASN_DEBUG("Encoding %s %" ASN_PRI_SIZE " as OCTET STRING", td ? td->name : "", st->size);
if(ct_size >= 0) {
/*
* Check that available data matches the constraint
*/
size_t unit_bytes;
switch(specs->subvariant) {
default:
case ASN_OSUBV_BIT:
ASN_DEBUG("Invalid use of OCTET STRING to encode BIT STRING");
ASN__ENCODE_FAILED;
case ASN_OSUBV_ANY:
/* Fall through */
case ASN_OSUBV_STR:
unit_bytes = 1;
break;
case ASN_OSUBV_U16:
unit_bytes = 2;
break;
case ASN_OSUBV_U32:
unit_bytes = 4;
break;
}
if(st->size != unit_bytes * (size_t)ct_size) {
ASN_DEBUG(
"Trying to encode %s (%" ASN_PRI_SIZE " bytes) which doesn't fit SIZE "
"constraint (%" ASN_PRI_SIZE ")",
td->name, st->size, ct_size);
ASN__ENCODE_FAILED;
}
} else {
/*
* X.696 (08/2015) #27.2
* Encode length determinant as _number of octets_, but only
* if upper bound is not equal to lower bound.
*/
ssize_t ret = oer_serialize_length(st->size, cb, app_key);
if(ret < 0) {
ASN__ENCODE_FAILED;
}
er.encoded += ret;
}
er.encoded += st->size;
if(cb(st->buf, st->size, app_key) < 0) {
ASN__ENCODE_FAILED;
} else {
ASN__ENCODED_OK(er);
}
}
#endif /* ASN_DISABLE_OER_SUPPORT */