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NativeEnumerated_oer.c
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/*
* Copyright (c) 2017 Lev Walkin <[email protected]>.
* All rights reserved.
* Redistribution and modifications are permitted subject to BSD license.
*/
#ifndef ASN_DISABLE_OER_SUPPORT
#include <asn_internal.h>
#include <NativeEnumerated.h>
#include <errno.h>
static long
asn__nativeenumerated_convert(const uint8_t *b, const uint8_t *end) {
unsigned long value;
/* Perform the sign initialization */
/* Actually value = -(*b >> 7); gains nothing, yet unreadable! */
if((*b >> 7)) {
value = (unsigned long)(-1);
} else {
value = 0;
}
/* Conversion engine */
for(; b < end; b++) {
value = (value << 8) | *b;
}
return value;
}
asn_dec_rval_t
NativeEnumerated_decode_oer(const asn_codec_ctx_t *opt_codec_ctx,
const asn_TYPE_descriptor_t *td,
const asn_oer_constraints_t *constraints,
void **nint_ptr, const void *ptr, size_t size) {
asn_dec_rval_t rval = {RC_OK, 0};
long *native = (long *)*nint_ptr;
const uint8_t *b = ptr;
(void)opt_codec_ctx;
(void)constraints;
if(size < 1) {
ASN__DECODE_STARVED;
}
if((*b & 0x80) == 0) {
/*
* X.696 (08/2015) #11.2 Short form for Enumerated.
*/
if(!native) {
native = (long *)(*nint_ptr = CALLOC(1, sizeof(*native)));
if(!native) ASN__DECODE_FAILED;
}
*native = *b;
rval.consumed = 1;
} else {
/*
* X.696 (08/2015) #11.4 Long form for Enumerated.
*/
size_t length = *b & 0x7f;
const uint8_t *bend;
long value;
if(length < 1 || length > sizeof(*native)) {
ASN__DECODE_FAILED;
}
if((1 + length) > size) {
ASN__DECODE_STARVED;
}
b++;
bend = b + length;
value = asn__nativeenumerated_convert(b, bend);
if(value < 0) {
const asn_INTEGER_specifics_t *specs =
(const asn_INTEGER_specifics_t *)td->specifics;
if(specs && specs->field_unsigned) {
ASN__DECODE_FAILED;
}
}
if(!native) {
native = (long *)(*nint_ptr = CALLOC(1, sizeof(*native)));
if(!native) ASN__DECODE_FAILED;
}
*native = value;
rval.consumed = (1 + length);
}
return rval;
}
/*
* Encode as Canonical OER.
*/
asn_enc_rval_t
NativeEnumerated_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) {
asn_enc_rval_t er;
long native;
(void)constraints;
if(!sptr) ASN__ENCODE_FAILED;
native = *(const long *)sptr;
if(native >= 0 && native <= 127) {
/* #11.2 Short form */
uint8_t b = native;
er.encoded = 1;
if(cb(&b, er.encoded, app_key) < 0) {
ASN__ENCODE_FAILED;
}
ASN__ENCODED_OK(er);
} else {
/* #11.2 Long form */
uint8_t buf[1 + sizeof(native)];
uint8_t *b = &buf[sizeof(native)]; /* Last addressable */
long final_pattern = -1 * (native < 0);
for(;;) {
*b-- = native;
native >>= 8;
if(native == final_pattern) {
if(final_pattern) {
if((b[1] & 0x80)) break;
} else {
if(!(b[1] & 0x80)) break;
}
}
}
*b = 0x80 | (&buf[sizeof(native)] - b);
er.encoded = 1 + (&buf[sizeof(native)] - b);
if(cb(b, er.encoded, app_key) < 0) {
ASN__ENCODE_FAILED;
}
ASN__ENCODED_OK(er);
}
}
#endif /* ASN_DISABLE_OER_SUPPORT */