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asn1c/skeletons/asn_application.c

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/*
* Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
* Redistribution and modifications are permitted subject to BSD license.
*/
#include <asn_internal.h>
#include <asn_application.h>
#include <errno.h>
static asn_enc_rval_t asn_encode_internal(const asn_codec_ctx_t *opt_codec_ctx,
enum asn_transfer_syntax syntax,
const asn_TYPE_descriptor_t *td,
const void *sptr,
asn_app_consume_bytes_f *callback,
void *callback_key);
struct callback_count_bytes_key {
asn_app_consume_bytes_f *callback;
void *callback_key;
size_t computed_size;
};
/*
* Encoder which just counts bytes that come through it.
*/
static int
callback_count_bytes_cb(const void *data, size_t size, void *keyp) {
struct callback_count_bytes_key *key = keyp;
int ret;
ret = key->callback(data, size, key->callback_key);
if(ret >= 0) {
key->computed_size += size;
}
return ret;
}
struct overrun_encoder_key {
void *buffer;
size_t buffer_size;
size_t computed_size;
};
struct callback_failure_catch_key {
asn_app_consume_bytes_f *callback;
void *callback_key;
int callback_failed;
};
/*
* Encoder which doesn't stop counting bytes
* even if it reaches the end of the buffer.
*/
static int
overrun_encoder_cb(const void *data, size_t size, void *keyp) {
struct overrun_encoder_key *key = keyp;
if(key->computed_size + size > key->buffer_size) {
/*
* Avoid accident on the next call:
* stop adding bytes to the buffer.
*/
key->buffer_size = 0;
} else {
memcpy((char *)key->buffer + key->computed_size, data, size);
}
key->computed_size += size;
return 0;
}
/*
* Encoder which help convert the application level encoder failure into EIO.
*/
static int
callback_failure_catch_cb(const void *data, size_t size, void *keyp) {
struct callback_failure_catch_key *key = keyp;
int ret;
ret = key->callback(data, size, key->callback_key);
if(ret < 0) {
key->callback_failed = 1;
}
return ret;
}
asn_enc_rval_t
asn_encode(const asn_codec_ctx_t *opt_codec_ctx,
enum asn_transfer_syntax syntax, asn_TYPE_descriptor_t *td,
void *sptr, asn_app_consume_bytes_f *callback, void *callback_key) {
struct callback_failure_catch_key cb_key;
asn_enc_rval_t er;
if(!callback) {
errno = EINVAL;
ASN__ENCODE_FAILED;
}
cb_key.callback = callback;
cb_key.callback_key = callback_key;
cb_key.callback_failed = 0;
er = asn_encode_internal(opt_codec_ctx, syntax, td, sptr,
callback_failure_catch_cb, &cb_key);
if(cb_key.callback_failed) {
assert(er.encoded == -1);
assert(errno == EBADF);
errno = EIO;
}
return er;
}
asn_enc_rval_t
asn_encode_to_buffer(const asn_codec_ctx_t *opt_codec_ctx,
enum asn_transfer_syntax syntax,
const asn_TYPE_descriptor_t *td, const void *sptr,
void *buffer, size_t buffer_size) {
struct overrun_encoder_key buf_key;
asn_enc_rval_t er;
if(buffer_size > 0 && !buffer) {
errno = EINVAL;
ASN__ENCODE_FAILED;
}
buf_key.buffer = buffer;
buf_key.buffer_size = buffer_size;
buf_key.computed_size = 0;
er = asn_encode_internal(opt_codec_ctx, syntax, td, sptr,
overrun_encoder_cb, &buf_key);
if(er.encoded >= 0 && (size_t)er.encoded != buf_key.computed_size) {
ASN_DEBUG("asn_encode() returned %" ASN_PRI_SSIZE " yet produced %" ASN_PRI_SIZE " bytes",
er.encoded, buf_key.computed_size);
assert(er.encoded < 0 || (size_t)er.encoded == buf_key.computed_size);
}
return er;
}
static asn_enc_rval_t
asn_encode_internal(const asn_codec_ctx_t *opt_codec_ctx,
enum asn_transfer_syntax syntax,
const asn_TYPE_descriptor_t *td, const void *sptr,
asn_app_consume_bytes_f *callback, void *callback_key) {
asn_enc_rval_t er;
enum xer_encoder_flags_e xer_flags = XER_F_CANONICAL;
(void)opt_codec_ctx; /* Parameters are not checked on encode yet. */
if(!td || !sptr) {
errno = EINVAL;
ASN__ENCODE_FAILED;
}
switch(syntax) {
case ATS_NONSTANDARD_PLAINTEXT:
if(td->op->print_struct) {
struct callback_count_bytes_key cb_key;
cb_key.callback = callback;
cb_key.callback_key = callback_key;
cb_key.computed_size = 0;
if(td->op->print_struct(td, sptr, 1, callback_count_bytes_cb,
&cb_key)
< 0
|| callback_count_bytes_cb("\n", 1, &cb_key) < 0) {
errno = EBADF; /* Structure has incorrect form. */
er.encoded = -1;
er.failed_type = td;
er.structure_ptr = sptr;
} else {
er.encoded = cb_key.computed_size;
er.failed_type = 0;
er.structure_ptr = 0;
}
} else {
errno = ENOENT; /* Transfer syntax is not defined for this type. */
ASN__ENCODE_FAILED;
}
break;
case ATS_RANDOM:
errno = ENOENT; /* Randomization doesn't make sense on output. */
ASN__ENCODE_FAILED;
case ATS_BER:
/* BER is a superset of DER. */
/* Fall through. */
case ATS_DER:
if(td->op->der_encoder) {
er = der_encode(td, sptr, callback, callback_key);
if(er.encoded == -1) {
if(er.failed_type && er.failed_type->op->der_encoder) {
errno = EBADF; /* Structure has incorrect form. */
} else {
errno = ENOENT; /* DER is not defined for this type. */
}
}
} else {
errno = ENOENT; /* Transfer syntax is not defined for this type. */
ASN__ENCODE_FAILED;
}
break;
case ATS_CER:
errno = ENOENT; /* Transfer syntax is not defined for any type. */
ASN__ENCODE_FAILED;
#ifdef ASN_DISABLE_OER_SUPPORT
case ATS_BASIC_OER:
case ATS_CANONICAL_OER:
errno = ENOENT; /* PER is not defined. */
ASN__ENCODE_FAILED;
break;
#else /* ASN_DISABLE_OER_SUPPORT */
case ATS_BASIC_OER:
/* CANONICAL-OER is a superset of BASIC-OER. */
/* Fall through. */
case ATS_CANONICAL_OER:
if(td->op->oer_encoder) {
er = oer_encode(td, sptr, callback, callback_key);
if(er.encoded == -1) {
if(er.failed_type && er.failed_type->op->oer_encoder) {
errno = EBADF; /* Structure has incorrect form. */
} else {
errno = ENOENT; /* OER is not defined for this type. */
}
}
} else {
errno = ENOENT; /* Transfer syntax is not defined for this type. */
ASN__ENCODE_FAILED;
}
break;
#endif /* ASN_DISABLE_OER_SUPPORT */
#ifdef ASN_DISABLE_PER_SUPPORT
case ATS_UNALIGNED_BASIC_PER:
case ATS_UNALIGNED_CANONICAL_PER:
errno = ENOENT; /* PER is not defined. */
ASN__ENCODE_FAILED;
break;
#else /* ASN_DISABLE_PER_SUPPORT */
case ATS_UNALIGNED_BASIC_PER:
/* CANONICAL-UPER is a superset of BASIC-UPER. */
/* Fall through. */
case ATS_UNALIGNED_CANONICAL_PER:
if(td->op->uper_encoder) {
er = uper_encode(td, sptr, callback, callback_key);
if(er.encoded == -1) {
if(er.failed_type && er.failed_type->op->uper_encoder) {
errno = EBADF; /* Structure has incorrect form. */
} else {
errno = ENOENT; /* UPER is not defined for this type. */
}
} else {
ASN_DEBUG("Complete encoded in %ld bits", (long)er.encoded);
if(er.encoded == 0) {
/* Enforce "Complete Encoding" of X.691 #11.1 */
if(callback("\0", 1, callback_key) < 0) {
errno = EBADF;
ASN__ENCODE_FAILED;
}
er.encoded = 8; /* Exactly 8 zero bits is added. */
}
/* Convert bits into bytes */
er.encoded = (er.encoded + 7) >> 3;
}
} else {
errno = ENOENT; /* Transfer syntax is not defined for this type. */
ASN__ENCODE_FAILED;
}
break;
#endif /* ASN_DISABLE_PER_SUPPORT */
case ATS_BASIC_XER:
/* CANONICAL-XER is a superset of BASIC-XER. */
xer_flags &= ~XER_F_CANONICAL;
xer_flags |= XER_F_BASIC;
/* Fall through. */
case ATS_CANONICAL_XER:
if(td->op->xer_encoder) {
er = xer_encode(td, sptr, xer_flags, callback, callback_key);
if(er.encoded == -1) {
if(er.failed_type && er.failed_type->op->xer_encoder) {
errno = EBADF; /* Structure has incorrect form. */
} else {
errno = ENOENT; /* XER is not defined for this type. */
}
}
} else {
errno = ENOENT; /* Transfer syntax is not defined for this type. */
ASN__ENCODE_FAILED;
}
break;
default:
errno = ENOENT;
ASN__ENCODE_FAILED;
}
return er;
}
asn_dec_rval_t
asn_decode(const asn_codec_ctx_t *opt_codec_ctx,
enum asn_transfer_syntax syntax, const asn_TYPE_descriptor_t *td,
void **sptr, const void *buffer, size_t size) {
if(!td || !td->op || !sptr || (size && !buffer)) {
ASN__DECODE_FAILED;
}
switch(syntax) {
case ATS_CER:
case ATS_NONSTANDARD_PLAINTEXT:
default:
errno = ENOENT;
ASN__DECODE_FAILED;
case ATS_RANDOM:
if(!td->op->random_fill) {
ASN__DECODE_FAILED;
} else {
if(asn_random_fill(td, sptr, 16000) == 0) {
asn_dec_rval_t ret = {RC_OK, 0};
return ret;
} else {
ASN__DECODE_FAILED;
}
}
break;
case ATS_DER:
case ATS_BER:
return ber_decode(opt_codec_ctx, td, sptr, buffer, size);
case ATS_BASIC_OER:
case ATS_CANONICAL_OER:
#ifdef ASN_DISABLE_OER_SUPPORT
errno = ENOENT;
ASN__DECODE_FAILED;
#else
return oer_decode(opt_codec_ctx, td, sptr, buffer, size);
#endif
case ATS_UNALIGNED_BASIC_PER:
case ATS_UNALIGNED_CANONICAL_PER:
#ifdef ASN_DISABLE_PER_SUPPORT
errno = ENOENT;
ASN__DECODE_FAILED;
#else
return uper_decode_complete(opt_codec_ctx, td, sptr, buffer, size);
#endif
case ATS_BASIC_XER:
case ATS_CANONICAL_XER:
return xer_decode(opt_codec_ctx, td, sptr, buffer, size);
}
}
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