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Decompressing zip files with C#

Friday, August 22, 2008 Pablo Santos , 7 Comments

Which is the fastest way to decompress ZIP files (fragments actually) using C#?

I tried with SharpZipLib vs zlib.net vs a wrapper on top of zlib 1.2.3.

Which one is faster?

I tried with the same test file, repeating 1000 times and these are the results:


$ time mono unzip.exe file ziplib 1000

real    0m4.491s
user    0m4.392s
sys     0m0.119s

$ time mono unzip.exe file sharp 1000

real    0m3.631s
user    0m3.550s
sys     0m0.090s

$ time mono unzip.exe file zlib 1000

real    0m1.754s
user    0m1.684s
sys     0m0.079s


Clear, right?

So, the zlib wrapper is two times faster than SharpZipLib which, in turn, is faster than zlib.net

For zlib wrapper I just called the uncompress method.

With SharpZipLib I used InflaterInputStream

InflaterInputStream st = new InflaterInputStream(file, new Inflater(true));

and for zlib.NET

zlib.ZOutputStream outZStream = new zlib.ZOutputStream(outStream);

Hope it helps!
Pablo Santos
I'm the CTO and Founder at Códice.
I've been leading Plastic SCM since 2005. My passion is helping teams work better through version control.
I had the opportunity to see teams from many different industries at work while I helped them improving their version control practices.
I really enjoy teaching (I've been a University professor for 6+ years) and sharing my experience in talks and articles.
And I love simple code. You can reach me at @psluaces.

Pablo Santos

7 comments:

  1. Georg WächterAugust 25, 2008 at 4:49 PM

    how big what the file?

    ReplyDelete
  2. Pablo SantosAugust 25, 2008 at 7:10 PM

    Hi,

    I tried with both small files (28Kb) and then a big number of text and binary files (about 3000), and zlib seems to be always faster

    ReplyDelete
  3. AnonymousAugust 25, 2008 at 7:22 PM

    Sounds normal.

    Where can one get your zlib binding?

    ReplyDelete
  4. Alexandre GomesAugust 26, 2008 at 12:00 AM

    Hi,

    You should try the 7zip C# lib too. I'm not sure if its faster, or not, but I'm sure I've been pretty satisfied with its results compressing a Webservice requests and responses in real-time to some huge resultsets (up to 10MB of data each).

    Cheers,

    ReplyDelete
  5. Pablo SantosAugust 26, 2008 at 12:22 AM

    Hi,

    If you can use a GPL library, you can take a look at:

    http://www.koders.com/csharp/fid91385D2988B36B949C4771DF3BCD36519D43154A.aspx

    ReplyDelete
  6. Pablo SantosAugust 26, 2008 at 12:22 AM

    Hi Alexandre,

    Thanks! I'll try to find the 7zip lib!

    ReplyDelete
  7. Alexandre GomesAugust 26, 2008 at 12:26 AM

    Sorry about that, forgot the link :P

    http://www.7-zip.org/sdk.html

    ReplyDelete

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