Protocol data unit encoding/decoding device.

摘要

In a protocol data unit encoding/decoding device for use in syntax translation between an Abstract Syntax which is a set of data types described by an Abstract Syntax Notation One (ASN.1) and a Transfer Syntax, a structure generating unit (28) automatically generates a frame of structures for input/reference of data values corresponding to data structure represented by the Abstract Syntax stored in an Abstract Syntax storage (10). The frame of structures is stored in a structure storage (14). A VTL function generating unit (30) automatically generates a VTL function for a Value Tree List (VTL) which is a table indicative of a matching between the structures and the data values for the data structure represented by the Abstract Syntax. The VTL function is stored in a VTL function storage (16). An AST generating unit (32) automatically generates an ASN.1 syntax tree (AST) which is a tree structure programmable from the data structure represented by the Abstract Syntax. The AST is stored in an AST storage (18). A PDU encoding/decoding unit (20) encodes/decodes a Protocol Data Unit (PDU) called by the VTL function on the basis of the AST. A user program (26) inputs/refers to, by using the VTL function, the data values which are components of the PDU. <IMAGE>