You can have it all - speed, flexibility, and a rich feature set. The OSS ASN.1/Java Compiler accepts one or more input files, each containing one or more ASN.1 modules. The OSS ASN.1/Java compiler is a compiled (not interpreted) executable, therefore capable of extremely fast ASN.1 compilation. The compiler verifies the ASN.1 specification and generates: informative diagnostic messages, Java classes for inclusion in your application, optional XSL stylesheets and/or DTD for XML encodings, and an optional ASN.1 output listing. The OSS ASN.1/Java compiler and runtime support ASN.1:1990, including all macros, as well as ASN.1:2002, ASN.1:2008, ASN.1:2015, and ASN.1:2021 including full support for contents constraints.
No matter what your application needs, a little or a lot, OSS provides it. The OSS compiler's features include generation of:
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).
Special features enable the OSS compiler to:
The encoder/decoder consists of a class called Coder, of which the essential methods are encode() and decode().
This utility included with the ASN.1 Tools for Java takes a BER or DER encoding in ASCII or binary format from an input file and writes it to an output file in one of three different type-length-value (TLV) formats.
Encode() 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, PER (aligned or unaligned), CPER, OER, COER, DER, CER, XER, CXER, E-XER, or JSON. The decode() method takes a string of bytes that have been encoded according to BER, PER, OER, COER, DER, 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.
The Java Interpretive ASN.1 API (IAAPI) is a collection of Java classes included with the ASN.1 Tools for Java. The Java IAAPI provides access to the ASN.1 type, subtype and value notation via an easy to use interface. This allows applications to create and encode data using ASN.1 without any foreknowledge of the structure of the data, such as the number of components and their types. It also allows messages (PDUs) to be decoded, and the components of the messages to be accessed, based on their data types.
For a list of the ASN.1 standards that the OSS ASN. Tools for Java conforms to, see the Standards Conformance page.
More information about how to create, compile and link your ASN.1 application using the ASN.1/Java Tools.
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