X．400协议测试环境中的ASN．1工具

ASN. 1 TOOL OF X. 400 PROTOCOL CONFORMANCETESTING ENVIRONMENT

Ｘ．４００协议是ＯＳＩ应用层最为成熟的一套关于信报处理的应用协议，目前已涌现大量的Ｘ．４００协议实现。为了验证这些协议实现的正确性及相互连接、相互操作的能力，需要对Ｘ．４００协议实现进行一致性测试。抽象语法表示法─—ＡＳＮ．１作为ＯＳＩ应用层协议描述所使用的一种形式化语言，不仅在Ｘ．４００协议实现中不可缺少，而且在对Ｘ．４００进行一致性测试中扮演举足轻重的作用。本文旨在分析ＡＳＮ．１工具的应用，并提出“ＯＳＩ网络一致性测试系统”中ＡＳＮ．１工具实现所采取的一种扩展内部表示结构ＥＮＯＤＥ树形表示法。

X. 400 protocol is one of the most maturing protocols about message handling in application layer. Since many products realizing X. 400 have emerged recently, it is mandatory to perform the conformance testing to them to verify the interworking and interoperability between them. ASN. 1 (abstract syntax notation one), as a general formal method defining the exchanging information within the Application layer, plays a great role in the X. 400 protocol realization. We on behalf the Department of Computer Science of Tsinghua University held the task of implementing a conformance testing environment for specific seven layer protocols. In this paper, we give our thorough analysis of the fundamentals and functions of ASN. I tool in the X. 400 protocol conformance testing environment, and submit a list based scheme to represent values of ASN. I called ENODE in a C language structure.