X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/b27841d687ec9e84983340b5581376dfb24010ea..b2b89723a2427bba8290bd6967a1ab39cbb630be:/libs/smux/include/stg/asn_application.h diff --git a/libs/smux/include/stg/asn_application.h b/libs/smux/include/stg/asn_application.h index 71e9ba61..3ca9f138 100644 --- a/libs/smux/include/stg/asn_application.h +++ b/libs/smux/include/stg/asn_application.h @@ -1,5 +1,5 @@ /*- - * Copyright (c) 2004, 2006 Lev Walkin . All rights reserved. + * Copyright (c) 2004-2017 Lev Walkin . All rights reserved. * Redistribution and modifications are permitted subject to BSD license. */ /* @@ -15,6 +15,95 @@ extern "C" { #endif +/* + * A selection of ASN.1 Transfer Syntaxes to use with generalized + * encoders and decoders declared further in this .h file. + */ +enum asn_transfer_syntax { + /* Avoid appearance of a default transfer syntax. */ + ATS_INVALID = 0, + /* Plaintext output (not conforming to any standard), for debugging. */ + ATS_NONSTANDARD_PLAINTEXT, + /* Returns a randomly generatede structure. */ + ATS_RANDOM, + /* + * X.690: + * BER: Basic Encoding Rules. + * DER: Distinguished Encoding Rules. + * CER: Canonical Encoding Rules. + * DER and CER are more strict variants of BER. + */ + ATS_BER, + ATS_DER, + ATS_CER, /* Only decoding is supported */ + /* + * X.696: + * OER: Octet Encoding Rules. + * CANONICAL-OER is a more strict variant of BASIC-OER. + */ + ATS_BASIC_OER, + ATS_CANONICAL_OER, + /* + * X.691: + * PER: Packed Encoding Rules. + * CANONICAL-PER is a more strict variant of BASIC-PER. + * NOTE: Produces or consumes a complete encoding (X.691 (08/2015) #11.1). + */ + ATS_UNALIGNED_BASIC_PER, + ATS_UNALIGNED_CANONICAL_PER, + /* + * X.693: + * XER: XML Encoding Rules. + * CANONICAL-XER is a more strict variant of BASIC-XER. + */ + ATS_BASIC_XER, + ATS_CANONICAL_XER +}; + +/* + * A generic encoder for any supported transfer syntax. + * RETURN VALUES: + * The (.encoded) field of the return value is REDEFINED to mean the following: + * >=0: The computed size of the encoded data. Can exceed the (buffer_size). + * -1: Error encoding the structure. See the error code in (errno): + * EINVAL: Incorrect parameters to the function, such as NULLs. + * ENOENT: Encoding transfer syntax is not defined (for this type). + * EBADF: The structure has invalid form or content constraint failed. + * The (.failed_type) and (.structure_ptr) MIGHT be set to the appropriate + * values at the place of failure, if at all possible. + * WARNING: The (.encoded) field of the return value can exceed the buffer_size. + * This is similar to snprintf(3) contract which might return values + * greater than the buffer size. + */ +asn_enc_rval_t asn_encode_to_buffer( + const asn_codec_ctx_t *opt_codec_parameters, /* See asn_codecs.h */ + enum asn_transfer_syntax, + const struct asn_TYPE_descriptor_s *type_to_encode, + const void *structure_to_encode, void *buffer, size_t buffer_size); + +/* + * A variant of asn_encode_to_buffer() with automatically allocated buffer. + * RETURN VALUES: + * On success, returns a newly allocated (.buffer) containing the whole message. + * The message size is returned in (.result.encoded). + * On failure: + * (.buffer) is NULL, + * (.result.encoded) as in asn_encode_to_buffer(), + * The errno codes as in asn_encode_to_buffer(), plus the following: + * ENOMEM: Memory allocation failed due to system or internal limits. + * The user is responsible for freeing the (.buffer). + */ +typedef struct asn_encode_to_new_buffer_result_s { + void *buffer; /* NULL if failed to encode. */ + asn_enc_rval_t result; +} asn_encode_to_new_buffer_result_t; +asn_encode_to_new_buffer_result_t asn_encode_to_new_buffer( + const asn_codec_ctx_t *opt_codec_parameters, /* See asn_codecs.h */ + enum asn_transfer_syntax, + const struct asn_TYPE_descriptor_s *type_to_encode, + const void *structure_to_encode); + + /* * Generic type of an application-defined callback to return various * types of data to the application. @@ -22,8 +111,40 @@ extern "C" { * -1: Failed to consume bytes. Abort the mission. * Non-negative return values indicate success, and ignored. */ -typedef int (asn_app_consume_bytes_f)(const void *buffer, size_t size, - void *application_specific_key); +typedef int(asn_app_consume_bytes_f)(const void *buffer, size_t size, + void *application_specific_key); + + +/* + * A generic encoder for any supported transfer syntax. + * Returns the comprehensive encoding result descriptor (see asn_codecs.h). + * RETURN VALUES: + * The negative (.encoded) field of the return values is accompanied with the + * following error codes (errno): + * EINVAL: Incorrect parameters to the function, such as NULLs. + * ENOENT: Encoding transfer syntax is not defined (for this type). + * EBADF: The structure has invalid form or content constraint failed. + * EIO: The (callback) has returned negative value during encoding. + */ +asn_enc_rval_t asn_encode( + const asn_codec_ctx_t *opt_codec_parameters, /* See asn_codecs.h */ + enum asn_transfer_syntax, + const struct asn_TYPE_descriptor_s *type_to_encode, + const void *structure_to_encode, + asn_app_consume_bytes_f *callback, void *callback_key); + + +/* + * A generic decoder for any supported transfer syntax. + */ +asn_dec_rval_t asn_decode( + const asn_codec_ctx_t *opt_codec_parameters, enum asn_transfer_syntax, + const struct asn_TYPE_descriptor_s *type_to_decode, + void **structure_ptr, /* Pointer to a target structure's pointer */ + const void *buffer, /* Data to be decoded */ + size_t size /* Size of that buffer */ +); + /* * A callback of this type is called whenever constraint validation fails @@ -34,9 +155,10 @@ typedef int (asn_app_consume_bytes_f)(const void *buffer, size_t size, * particular constraint has failed. */ typedef void (asn_app_constraint_failed_f)(void *application_specific_key, - struct asn_TYPE_descriptor_s *type_descriptor_which_failed, + const struct asn_TYPE_descriptor_s *type_descriptor_which_failed, const void *structure_which_failed_ptr, - const char *error_message_format, ...) GCC_PRINTFLIKE(4, 5); + const char *error_message_format, ...) CC_PRINTFLIKE(4, 5); + #ifdef __cplusplus }