compression – Page 2

Looking for large text files for testing compression in all sizes

January 1, 2024 by Tarik

*** Linux users only *** Arbitrarily large text files can be generated on Linux with the following command: tr -dc “A-Za-z 0-9” < /dev/urandom | fold -w100|head -n 100000 > bigfile.txt This command will generate a text file that will contain 100,000 lines of random text and look like this: NsQlhbisDW5JVlLSaZVtCLSUUrkBijbkc5f9gFFscDkoGnN0J6GgIFqdCLyhbdWLHxRVY8IwDCrWF555JeY0yD0GtgH21NotZAEe iWJR1A4 bxqq9VKKAzMJ0tW7TCOqNtMzVtPB6NrtCIg8NSmhrO7QjNcOzi4N b VGc0HB5HMNXdyEoWroU464ChM5R … Read more

Compression API on the iPhone

January 1, 2024 by Tarik

If you store the data for the conversations in an NSData object, the folks at the CocoaDev wiki have posted an NSData category that adds gzip and zlib compression / decompression as simple methods. These have worked well for me in my iPhone application. As the above link has gone dead while the CocoaDev wiki … Read more

Installed .Net 4.5 but can’t use ZipFile class in Visual C#

December 29, 2023 by Tarik

See ZipFile Class on MSDN. It shows the required framework version is 4.5. Once the framework version is fixed check you have added a reference to the System.IO.Compression.FileSystem.dll assembly and added a using System.IO.Compression directive to your class.

What is the difference between httpCompression and urlCompression?

December 26, 2023 by Tarik

urlCompression specifies what to compress and httpCompression indicates how to do the compression. If you’re running on IIS7.5, you don’t need to specify anything, both dynamic and static compression are enabled by default, both use gzip; here are some links on urlCompression and httpCompression.

How can I enable keep-alive?

December 25, 2023 by Tarik

Configure Apache KeepAlive settings Open up apache’s configuration file and look for the following settings. On Centos this file is called httpd.conf and is located in /etc/httpd/conf. The following settings are noteworthy: KeepAlive: Switches KeepAlive on or off. Put in “KeepAlive on” to turn it on and “KeepAlive off” to turn it off. MaxKeepAliveRequests: The … Read more

Tomcat 7 GZIP compression not working

December 23, 2023 by Tarik

If Tomcat is fronted by Apache on port 80, you will need to enable compression in Apache itself. The compression in Tomcat will only work if you access it directly on port 8080.

Nothing happens when I try to send files / folders to Compressed (zipped) folder [closed]

December 21, 2023 by Tarik

I ran into this issue as well. However my fix was much easier. My file names and paths were too long to be zipped. There was no warning. I resolved it by copy-pasting the directory to another with a shorter path. e.g. from /this/path/is/way/too/ooo/ooo/oo/long to /home/Desktop

Is there a built-in zip library in .NET 3.5?

December 20, 2023 by Tarik

EDIT: See note in comments – SharpZipLib is now unmaintained, and you probably want to avoid it. Open source: #ZipLib I believe that the classes in the System.IO.Compression namespace are fine for compressing/decompressing a single stream of data, but there’s nothing built into the framework to cope with actual zip files. EDIT: As noted in … Read more

Export to CSV and Compress with GZIP in postgres

December 20, 2023 by Tarik

The trick is to make COPY send its output to stdout, then pipe the output through gzip: psql -c “COPY foo_table TO stdout DELIMITER ‘,’ CSV HEADER” \ | gzip > foo_table.csv.gz

Notice: ob_end_flush(): failed to send buffer of zlib output compression (1) in

December 19, 2023 by Tarik