compression

UPDATE Feb 10 2012: zOompf has completed some very thorough research on this very topic here . It trumps any findings below. UPDATE Sept 11 2010: A testing platform has been created for this here HTTP 1.1 definitions of GZIP and DEFLATE (zlib) for some background information: " 'Gzip' is the gzip format, and 'deflate' is the zlib format . They should probably have called the second one 'zlib' instead to avoid confusion with the raw deflate compressed data format. While the HTTP 1.1 RFC 2616 correctly points to the zlib specification in RFC 1950 for the 'deflate' transfer encoding, there have

I had a somewhat lively discussion the other day about minifying Javascript and CSS versus someone who prefers using Gzip. I'll call this person X. X said that Gzip allready minifies the code, since it zips your files. I disagree. Zip is a lossless method of shrinking filesize. Lossless means the original must be restored perfectly, meaning info must be stored to be able to restore the spaces, the un-needed characters, commented code and everything else. That takes up more space, since more must be compressed. I have no method of testing, but I believe that the Gzip of this code: .a1 {

TL;DR; Is there a way to compress an image (mostly jpeg, png and gif) directly browser-side, before uploading it ? I'm pretty sure JavaScript can do this, but I can't find a way to achieve it. Here's the full scenario I would like to implement: the user goes to my website, and choose an image via an input type="file" element, this image is retrieved via JavaScript, we do some verification such as correct file format, maximum file size etc, if every thing is OK, a preview of the image is displayed on the page, the user can do some basic operations such as rotate the image by 90°/-90°, crop it

What is the the best JavaScript compressor available? I'm looking for a tool that: is easy to use has a high compression rate Produce reliable end results (doesn't mess up the code) mishoo I recently released UglifyJS , a JavaScript compressor which is written in JavaScript (runs on the NodeJS Node.js platform, but it can be easily modified to run on any JavaScript engine, since it doesn't need any Node.js internals). It's a lot faster than both YUI Compressor and Google Closure , it compresses better than YUI on all scripts I tested it on, and it's safer than Closure (knows to deal with "eval

I have the following problem: suppose that I have a directory containing compressed directories which contain multiple files, stored on HDFS. I want to create an RDD consisting some objects of type T, i.e.: context = new JavaSparkContext(conf); JavaPairRDD<String, String> filesRDD = context.wholeTextFiles(inputDataPath); JavaPairRDD<String, String> filesRDD = context.wholeTextFiles(inputDataPath); JavaRDD<T> processingFiles = filesRDD.map(fileNameContent -> { // The name of the file String fileName = fileNameContent._1(); // The content of the file String content = fileNameContent._2(); //