compression

I'm implementing Deflate and GZip compression for web content. The .NET Framework DeflateStream performs very well (it doesn't compress that good as SharpZipLib, but it is much faster). Unfortunately it (and all other libs i know) miss a function to write precompressed data like stream.WritePrecompressed(byte[] buffer). With this function it would be possible to insert precompressed blocks in the stream. This could reduce the cpu load for compressing this part and increase the total throughput of the web server. Is there any managed lib capable of doing this? Or is there any good starting

Along the lines of this question I want to create a HttpModule that will do some custom logging of requests and responses for us. Using the code in the most popular answer for that question I've got a HttpModule up and running which does indeed work: class PortalTrafficModule : IHttpModule { public void Dispose() { // Do Nothing } public void Init(HttpApplication context) { context.BeginRequest += new EventHandler(context_BeginRequest); context.EndRequest += new EventHandler(context_EndRequest); } private void context_BeginRequest(object sender, EventArgs e) { HttpContext context = (

how do you encode words using the huffman code such as NEED Huffman encoding basically uses variable-length bit strings to represent tokens (generally characters with a couple of exceptions). The more common a token is, the shorter it's bit-length is and this is (usually) dynamic as the stream is processed. There are usually two special tokens, ESCAPE and END-STREAM. Encoding maintains a dictionary which is basically a lookup of the bit sequences to get a token. Initially it contains only the two special tokens. The initial bit sequences for ESCAPE and END_STREAM could be 0 and 1 (which is

I have a zip file compressed using Ionic zip . Before extracting I need to verify the available disk space. But how do I find the uncompressed size before hand? Is there any header information in the zip file (by ionic) so that I can read it? Taniq This should do the trick: static long totaluncompressedsize; static string info; . . . . // Option 1 foreach (ZipEntry e in zip) { long uncompressedsize = e.UncompressedSize; totaluncompressedsize += uncompressedsize; } // Or // Option 2 - will need to sift through the mass of info using (ZipFile zip = ZipFile.Read(zipFile)) { info = zip.Info; }

At the Velocity 2010 conference, Google said that header compression can yield big gains : Hölzle noted a glaring inefficiency in the handling of web page headers, which provide information about a user’s IP address, browser and other session data. The average web page makes 44 calls to different resources, with many of those requests including repetitive header data. Holzle said compressing the headers produces an 88 percent page load improvement for some leading sites. How does one ensure that the response headers sent by the web server are compressed? Is this even possible with today's

I am sending an image over the network via wifi or the mobile network to be stored in a server and retrieved again. I've done that but due to the size of images taken by the camera it's making my app slow, just to point out I'm opening the gallery and taking the pictures from there and not taking the picture directly from the app. I have noticed that images from whatsapp that have been taken from the camera and gallery have been compressed to approx. 100kb. At the moment my code takes a file and converts it to bytes and then sends it. Here is the method for taking a file and converting it to

I'm developing an Android 2.2 application. I want to add some big text files (4.5MB or more) to Android project. First I don't know if I can add such kind of big files to assets folder. But, if I can, is it possible to compress them? How can I compress files? and decompress? Any other better way to add big text files to Android project? Thanks. rosstheboss Files over 1 MB placed in the assets folder won't be readable from your app (It'll throw an exception). This is because they get compressed during the build process, and thus the phone requires substantial resources to uncompress them when