What is the best compression algorithm that allows random reads/writes in a file? [closed]

I am stunned at the number of responses that imply that such a thing is impossible. Have these people never heard of “compressed file systems”, which have been around since before Microsoft was sued in 1993 by Stac Electronics over compressed file system technology? I hear that LZS and LZJB are popular algorithms for people … Read more

Is it possible to get the compressed and uncompressed sizes of a file on a btrfs file system?

there is a third party tool that can do this. https://github.com/kilobyte/compsize usage: ayush@devbox:/code/compsize$ sudo compsize /opt Processed 54036 files, 42027 regular extents (42028 refs), 27150 inline. Type Perc Disk Usage Uncompressed Referenced Data 82% 5.3G 6.4G 6.4G none 100% 4.3G 4.3G 4.3G zlib 37% 427M 1.1G 1.1G lzo 56% 588M 1.0G 1.0G

How to optimise an Image in React Native

If you are using react-native-image-picker for uploading images, you can set maxWidth, maxHeight or quality of image for reducing the size. const options = { title: ‘Select Picture’, storageOptions: { skipBackup: true, path: ‘images’, }, maxWidth: 500, maxHeight: 500, quality: 0.5, }; ImagePicker.showImagePicker(options, resolve, reject);

Can a JPEG compressed image be rotated without a loss in quality?

There is a program named jpegtran jpegtran – a utility for lossless transcoding between different JPEG formats. To rotate the image losslessly, you can do the following: $ jpegtran -rotate 180 -perfect -outfile rotated.jpg origin.jpg And Here is a list of applications which provide the JPEG lossless rotation feature based on the IJG code

Looking for large text files for testing compression in all sizes

*** 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

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