This document evaluates different tools for efficiently encoding and decoding network data representations. It analyzes encoding and decoding techniques used by ASN.1 tools like SNACC, C ASN.1, and ISODE's POSY/PEPY. Benchmark results found that C ASN.1 encoders and decoders were the fastest. The conclusion recommends that efficient encoders and decoders must be carefully tuned and optimized to leverage advances in processor and memory speeds.

1. Implementing Efficient Encoders and
Decoders For Network Data Representations
Prepared by:
Ms. Pooja Mehta
ITSNS Branch,
GTU-CDAC-BISAG ME Program,
Gandhinagar
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2. Content
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 Abstract
 Introduction
 Tool benchmarked
 General encoding and decoding procedure
 Encoding and decoding technique
 Benchmark results
 Conclusion
 References
2/17/2016By: Pooja Mehta

3. Abstract
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 Expensive encoding
 Data representation standards
 Crucial areas
2/17/2016By: Pooja Mehta

4. Introduction
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 XDR
 Language to describe data formats
 RPC and NFS
 Expensive part of the OSI protocol stack
 Reduced Overload
2/17/2016
By: Pooja Mehta

5. Tools Benchmarked
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 ASN.l tools:
 SNACC
 C ASN.1
 ISODE’s POSY/PEPY
2/17/2016By: Pooja Mehta

6. General Encoding & Decoding Procedure
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 What is encoding ?
 Goal
 Choice of buffer
 “one-pass encoding”
 What is decoding ?
 Allocation Strategy 2/17/2016

7. Encoding & Decoding Technique
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1. SNACC
 Forward encoders
 Backward encoders
 Uses backward approach
2/17/2016By: Pooja Mehta

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2. C ASN.1
 IDX Buffers
 Can be decoded more than once
 No range checking
 Cause segmentation
Encoding & Decoding Technique
2/17/2016By: Pooja Mehta

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3. POSY/PEPY
 Two separate stages
 PElement
 Decoding
Encoding & Decoding Technique
2/17/2016By: Pooja Mehta

10. Benchmark Results
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 CER encoder-decoder were fastest
 Usefulness of CER
 PER92 encoder-decoder
 Performance of XDR and NDR
 ASN.1 compilers
 Encoding techniques 2/17/2016

11. Conclusion
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 Efficient encoder and decoder must be tuned
 Several design rules
 Faster processor and memory
 Faster encoding and decoding techniques
2/17/2016By: Pooja Mehta

12. References
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 http://www3.physnet.uni-hamburg.de/physnet/Tru64-
Unix/HTML/AQ0R5BTE/DOCU_005.html
 http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnum
ber=253375
2/17/2016By: Pooja Mehta

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Thank
you...!