The OSS ASN.1 Tools for C is a development tool for building C applications using ASN.1. It supports the ASN.1 syntax as described by the ASN.1:1990 through ASN.1:2021 standards and the following encoding rules:
The OSS ASN.1 Tools for C is designed to meet your needs and comes with many customization features, which include: command-line options, compiler directives, and encoder/decoder flags.
The OSS ASN.1 Tools for C package includes the following components:
The ASN.1/C compiler takes ASN.1 specifications as input and generates C language data structures and control tables for encoding and decoding. It also provides extensive diagnostic capabilities to minimize your development time and effort.
The following files are generated:
Based on the code size, encoding/decoding speed and diagnostic capabilities, the runtime libraries are classified into three categories:
The Space-Optimized Encoder/Decoder (SOED) is table-driven and, as its name implies, minimizes the use of memory, which is especially useful when the schema is large or complex. Both the encoder and decoder have a simple, yet flexible memory management interface, as well as a wealth of trace, error trapping, diagnostic, and recovery capabilities.
The Time-Optimized Encoder/Decoder (TOED), on the other hand, is optimized for speed. It includes the same capabilities as SOED, except for tracing.
The Lean Encoder/Decoder (LED) is a table-driven encoder/decoder that is provided separately by OSS Nokalva. Similar to TOED, it is optimized for speed, and, similar to SOED, it uses a minimum amount of memory. LED is best suited for embedded systems that have a limited amount of memory and require a short amount of processing time while running applications.
The following diagram shows an overview of the SOED and TOED workflow. For more information about choosing the right encoder/decoder that suits your specific needs, see ASN.1 Tools for C - Runtime Choices.
ASN.1 Studio is a graphical development environment available for Windows and Linux platforms, and provides a rich set of capabilities that make the ASN.1 compilation process easier.
You can use ASN.1 Studio to:
To read more about its features, see ASN.1 Studio.
SOED and TOED workflow
This documentation applies to the OSS® ASN.1 Tools for C release 11.1 and later.
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Every distributed copy of the OSS® ASN.1 Tools for C is associated with a specific license and related unique license number. That license determines, among other things, what functions of the OSS ASN.1 Tools for C are available to you.