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I am Dave Jing Tian, an Assistant Professor in the Department of Computer Science at Purdue University working on system security. My research involves embedded systems, operating systems, trusted and confidential computing, and hardware security and trust. All opinions are my own.
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Category Archives: H.248/MEGACO/EGCP
itevad – How to write your own protocol and its stack – part 9
Previous_Part_8 Now we are moving to the last post of ‘itevad’ – writing a stack for decoding text format of Itevad Protocol using Flex and Bison as well as C as a main function. Being different with previous Flex and … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged bison, flex, itevad
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itevad – How to write your own protocol and its stack – part 8
Previous_Part_7 After writing a Flex standalone lexer, we are going to make it a little bit useful – adding parser, Bison. When Flex and Bison work together, standalone flex file needs some changes to cooperate with Bison, as you will … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged bison, flex, itevad
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itevad – How to write your own protocol and its stack – part 7
Previous_Part_6 From this post, we will have to learn Flex and Bison, which are assumed to have very bizarre grammars to write and understand. Fortunately, we will step forwardly from Flex standalone, Flex+Bison and Flex+Bison+C finally. Please kindly note that … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged bison, flex, itevad
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itevad – How to write your own protocol and its stack – part 6
Previous_Part_5 From this post, we will start our Flex and Bison journey. Before that, we will need a clarification for BNF and ABNF again and give ABNF description of Iitevad accordingly. As mentioned in General Background, BNF and ABNF are … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged ABNF, bison, BNF, flex, itevad
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itevad – How to write your own protocol and its stack – part 5
Previous_Part_4 In this post, we will begin our Itevad Protocol Text Encoder. Again, with the help of ASN.1 compiler, we have already got the structure of Itevad itself. Moreover, we have implemented binary encoder and decoder in previous post. For … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged asn1c, text
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itevad – How to write your own protocol and its stack – part 4
Previous_Part_3 In this post, we will continue our Itevad Protocol Binary Ber Decoder. With the help of ANS.1 compiler, not only do we get the structural description of Itevad protocol itself but also the necessary converting functions used to convert … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged ber, decoder, xer
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itevad – How to write your own protocol and its stack – part 3
Previous_Part_2 In this post, we will focus on writing Itevad Protocol Binary Ber Encoder. With the necessary headers and sources generated in Part_2, now we could write our Ber Encoder. Then we will run our encoder and use hexdump to … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged ber, encoder, hexdump, itevad
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itevad – How to write your own protocol and its stack – part 2
Previous_Part_1 In this part, we will start to play with ASN.1 and asn1c – installing open source ASN.1 compiler, asn1c, writing ANS.1 description of Itevad and then compiling. Please note we will not cover detailed grammar of ASN.1 or how … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged ASN.1, asn1c, itevad
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itevad – How to write your own protocol and its stack – part 1
From this post, as well as the following 4~6 posts, I will try to illustrate how to write your own protocol and its stack, step by step. You will learn all the related stuffs to write a carrier grade telecommunication … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming, Stuff about Compiler
Tagged ABNF, asn1, asn1c, bison, BNF, flex, itevad, lex, yacc
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jmgsim – a Java implementation of H.248 media gateway simulator
‘jmgsim’ is a Java implementation of H.248 Media Gateway (MG) simulator and Media Gateway Controller (MGC) simulator used for testing real MG/MGC. It is coded within NetBeans 7.1 and has been published as a public project at ‘java.net’, as ‘kenai’ … Continue reading
Posted in Dave's Tools, H.248/MEGACO/EGCP, Programming
Tagged H.248, Java, java.net, jmgsim, kenai, media gateway, netbeans
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