The Talura ASN.1 extractor concept.

The ASN.1 extractor concept consist of two separate parts:

Talura ASN.1 compiler (TACO).
Talura ASN.1 run-time engine (TARE).

Supported ASN.1 specifications

The Talura ASN.1 compiler supports the following standards:

Standard title	ITU-T	ISO
Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation	X.680	8824-1
Information technology - Abstract Syntax Notation One (ASN.1): Information object specification.	X.681	8824-2
Information technology - Abstract Syntax Notation One (ASN.1): Constraint specification.	X.682	8824-3
Information technology - Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specification.	X.683	8824-4

The Talura ASN.1 compiler (TACO). (download demo)

The Talura ASN.1 compiler transforms the ASN.1 protocol specification to ISO-C99 data-types and data-values (Type/Value/ValueSet/ObjectClass/Object/ObjectSet and their Parameterized variants).
Furthermore data for encoding and decoding all data-types are generated.

The application designer can use the data-types and data-values in the application design and encode/decode data via a simple Application Programming Interface (API)

The Talura ASN.1 run-time engine (TARE).

The virtual processor is made to meet the following requirements:

Ultra fast run-time execution.
Robust implementation.
Easy to incorporate in existing applications.
Portable between operating systems following international standards.

To make it easy to upgrade existing applications to use TARE and design new applications with TARE, a simple, but still powerful API has been designed.

The Application Programming Interface (API)

Type

Each Type in the protocol specification is assigned a unique identification by the Talura ASN.1 compiler. This identification is used to point out how data is encoded/decoded.

Value

Values of simple-types are represented in 'C'-native format or in basic formats specified in the documentation for types not representable in 'C'-native format, combined with ASN.1 protocol specification specific formats for structured-types. A corresponding 'C'-native value representation is used for the following BuiltinTypes:

BOOLEAN
ENUMERATED
INTEGER
REAL

Encoding of a Protocol Data Unit (PDU)

The user presents the data to be encoded as a Value of the specified Type.
The Talura ASN.1 run-time engine checks and encodes the Value to generate a PDU according to the ASN.1 protocol and encoding rules specified.

Decoding of a Protocol Data Unit (PDU)

The Talura ASN.1 run-time engine decodes and checks the PDU according to the ASN.1 protocol specification of the Type and encoding rules specified.
The decoded PDU is presented as a Value of the specified Type.