Subject: [rohc] Doubts in the RFC 4464

From: "Gangadharan G - NPD, Chennai" <[email-masked]>
Date: Sat, 5 Aug 2006 04:51:04 +0530

Hi  All, 
 
I have some more doubts regarding Sigcomp's Compressor module.
 
1)
I am using LZSS algorithm for compression.
I have implemented the SIP Dictionary in a hash table format.
The maximum length of the SIP/SDP key is 35 (as per the key mentioned
below).
        "481 Call/Transaction Does Not Exist"  4 0127 0023 [3] 21.4.19 
   
    Q1.Whether I need to keep the search window size as 35 ?
         i.e., Match the first 35 chars from the lookahead pointer in the
Dictionay Hash Table.
                If not matched , decrement the char count by 1 (35, 34, 33,
....)
                    Repeat till 3 char count (Since matching 2 chars is not
efficient for LZSS ) 
 
    Q2: If the token is not matched in the Dictionary hash table , Whether I
need to check for any match in 
          the compressed buffer of the same message (as basic LZSS algorithm
specifies)?
 
2) The bytecode for LZSS specified in the RFC 4464 has the below UDVM
instruction.
 
        INPUT-HUFFMAN (index, end_of_message, 2, 9, 0, 255, 16384, 4, 4096,
8191, 1)
   
      Q3: what does the number 16384 imply?

Please forgive me if I am ignorant on anything.
 
Thanks,
Gangadharan.

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