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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 <INTEGER.h>
#include <errno.h>
asn_dec_rval_t
INTEGER_decode_oer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
const asn_oer_constraints_t *constraints, void **sptr,
const void *ptr, size_t size) {
asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
asn_dec_rval_t rval = {RC_OK, 0};
INTEGER_t *st = (INTEGER_t *)*sptr;
struct asn_oer_constraint_number_s ct = {0, 0};
size_t req_bytes;
(void)opt_codec_ctx;
(void)specs;
if(!st) {
st = (INTEGER_t *)(*sptr = CALLOC(1, sizeof(*st)));
if(!st) ASN__DECODE_FAILED;
}
FREEMEM(st->buf);
st->buf = 0;
st->size = 0;
if(!constraints) constraints = td->oer_constraints;
if(constraints) ct = constraints->value;
if(ct.width) {
req_bytes = ct.width;
} else {
/* No lower bound and no upper bound, effectively */
ssize_t consumed = oer_fetch_length(ptr, size, &req_bytes);
if(consumed == 0) {
ASN__DECODE_STARVED;
} else if(consumed == -1) {
ASN__DECODE_FAILED;
}
rval.consumed += consumed;
ptr = (const char *)ptr + consumed;
size -= consumed;
}
if(req_bytes > size) {
ASN__DECODE_STARVED;
}
if(ct.positive) {
/* X.969 08/2015 10.2(a) */
unsigned msb; /* Most significant bit */
size_t useful_size;
/* Check most significant bit */
msb = *(const uint8_t *)ptr >> 7; /* yields 0 or 1 */
useful_size = msb + req_bytes;
st->buf = (uint8_t *)MALLOC(useful_size + 1);
if(!st->buf) {
ASN__DECODE_FAILED;
}
/*
* Record a large unsigned in a way not to confuse it
* with signed value.
*/
st->buf[0] = '\0';
memcpy(st->buf + msb, ptr, req_bytes);
st->buf[useful_size] = '\0'; /* Just in case, 0-terminate */
st->size = useful_size;
rval.consumed += req_bytes;
return rval;
} else {
/* X.969 08/2015 10.2(b) */
st->buf = (uint8_t *)MALLOC(req_bytes + 1);
if(!st->buf) {
ASN__DECODE_FAILED;
}
memcpy(st->buf, ptr, req_bytes);
st->buf[req_bytes] = '\0'; /* Just in case, 0-terminate */
st->size = req_bytes;
rval.consumed += req_bytes;
return rval;
}
}
/*
* Encode as Canonical OER.
*/
asn_enc_rval_t
INTEGER_encode_oer(asn_TYPE_descriptor_t *td,
const asn_oer_constraints_t *constraints, void *sptr,
asn_app_consume_bytes_f *cb, void *app_key) {
const INTEGER_t *st = sptr;
asn_enc_rval_t er;
struct asn_oer_constraint_number_s ct = {0, 0};
const uint8_t *buf;
const uint8_t *end;
size_t useful_bytes;
size_t req_bytes = 0;
int sign = 0;
if(!st || st->size == 0) ASN__ENCODE_FAILED;
if(!constraints) constraints = td->oer_constraints;
if(constraints) ct = constraints->value;
er.encoded = 0;
buf = st->buf;
end = buf + st->size;
sign = (buf && buf < end) ? buf[0] & 0x80 : 0;
/* Ignore 9 leading zeroes or ones */
if(ct.positive) {
if(sign) {
/* The value given is a signed value. Can't proceed. */
ASN__ENCODE_FAILED;
}
/* Remove leading zeros. */
for(; buf + 1 < end; buf++) {
if(buf[0] != 0x0) break;
}
} else {
for(; buf + 1 < end; buf++) {
if(buf[0] == 0x0 && (buf[1] & 0x80) == 0) {
continue;
} else if(buf[0] == 0xff && (buf[1] & 0x80) != 0) {
continue;
}
break;
}
}
useful_bytes = end - buf;
if(ct.width) {
req_bytes = ct.width;
} else {
ssize_t r = oer_serialize_length(useful_bytes, cb, app_key);
if(r < 0) {
ASN__ENCODE_FAILED;
}
er.encoded += r;
req_bytes = useful_bytes;
}
if(req_bytes < useful_bytes) {
ASN__ENCODE_FAILED;
}
er.encoded += req_bytes;
for(; req_bytes > useful_bytes; req_bytes--) {
if(cb(sign?"\xff":"\0", 1, app_key) < 0) {
ASN__ENCODE_FAILED;
}
}
if(cb(buf, useful_bytes, app_key) < 0) {
ASN__ENCODE_FAILED;
}
ASN__ENCODED_OK(er);
}
#endif /* ASN_DISABLE_OER_SUPPORT */
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