ASN.1 Compiler for Java

The ASN.1 compiler for Java is a compiled (not interpreted) executable, therefore, it is capable of extremely fast ASN.1 compilation. The compiler accepts one or more input files, where each contains one or more ASN.1 modules, it verifies that the ASN.1 schema is valid, and generates the following:

• Java classes to be included in your application
• Informative diagnostic messages for any invalid ASN.1. The OSS compiler makes every attempt to recover from errors. Giving you messages for each error encountered means fewer recompilations to correct an invalid spec.
• Optional XSL stylesheets and/or DTD for XML encodings
• An optional ASN.1 output listing
• A simple directory structure
• Java instantiations of all ASN.1 values
• Only the Java classes (based on the ASN.1 types) that you select - modules, PDUs, metadata (i.e. tags, names, constraints). Your application is leaner, thus your development time is reduced.

Key features of the ASN.1 Compiler for Java

Does your application need to do automatic decoding? Handle multiple ASN.1 versions? Work in a multi-threading environment? Does your spec contain values, extensible types and information object sets? Then you need the full featured OSS compiler. It generates valid Java code no matter what spec you use (RRC, S1/X2, RANAP, NBAP are just a few of the specs that our customers use that our compiler handles with no problem).

• Support of the latest ASN.1 standards
• Full support for contents constraints. Our ASN.1/Java compiler is comprehensive - not a tag or constraint is left behind.
• Handle even the most unusual ASN.1 specifications that strain the JVM compiler limits.
• Work with third party IDEs such as emacs and Microsoft Visual Studio.
• Automate the sample application process enabling you to try out our tools quickly with a minimum of effort.
• Generate a batch or script file to facilitate Java compilation.

No matter what your application needs, a little or a lot, OSS provides it.

For a complete list of features, see Features shared across all OSS ASN.1 Tools.

ASN.1 Encoder/Decoder

The OSS encoders/decoders consist of a class called Coder, of which the essential methods are encode() and decode().

The encode() method takes data placed by your application program in the compiler-generated Java classes, and converts it to a string of bytes encoded according to BER, DER, CER, PER, UPER, CPER, CUPER OER, COER, XER, CXER, E-XER, or JSON. The decode() method takes a string of bytes that have been encoded according to BER, DER, CER, PER, UPER, CPER, CUPER OER, COER, CER, XER, CXER, E-XER, or JSON and performs the inverse operation of the encoder, resulting in a Java object that you can easily manipulate.

Key features of the ASN.1 Encoder/Decoder

• Full support of BER, DER, CER, PER, UPER, CPER, CUPER, OER, COER, XER, CXER, E-XER, and JSON encoding rules
• Powerful, flexible diagnostic and recovery capabilities
• Methods for copying, and comparing decoded messages
• Convenient mechanism for printing values of any type: System.out.println(value)
• Custom printing capabilities - print it your way!
• Dynamically extend extensible information object sets.
• Convert to/from binary/hex format.
• Debug BER encodings (OSSTLV).
• Debug PER encodings (ASN.1 Studio).
• JIA API - a way to access data values without knowing the type of the data

See Runtime Choices to find the right encoder/decoder that suits your specific needs.