Writing text files 1 gig+ directly into compression.

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Hello there! I'm trying to figure out a way to write large generated text files directly into compression using C#. They are list of characters such as:

AAA
AAB
AAC

They compress very well, but the initial files are enormous. The GZIP libraries in C# only cut the file size in half, where as winrar knocks it down to a 10th. This is acceptable where as half isn't.

These files get extremely large, over a terabyte.

Posted 5-Nov-11 16:30pm

joeswindell

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Sergey Alexandrovich Kryukov 5-Nov-11 22:44pm

I wonder how big is the set of all possible characters? Not just 3 characters A, B, C? If it's relatively small set, you could compress it way more effectively. GZIP and RAR are just not optimized for such untypical content. And of course you can create a compressed stream and write into it.
--SA

joeswindell 5-Nov-11 22:57pm

The max I'm looking at is 25^10 a permutation of 10 slots with each slot having 25 possible characters.

BillWoodruff 6-Nov-11 0:08am

Are there consistent patterns of duplication of content within the files ... which could somehow be analyzed and replaced by some form of tagging system ... pre-encryption ?

joeswindell 6-Nov-11 15:09pm

Yes MANY of them! I've been looking at compression that uses things like that but I'm not sure I understand it.

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Mehdi Gholam · Accepted Answer · 2011-11-05T19:29:00

Solution 1

Take a look at these :

http://sevenzipsharp.codeplex.com/[^]

C# (.NET) Interface for 7-Zip Archive DLLs[^]

Posted 5-Nov-11 19:29pm

Mehdi Gholam