compression

问题 I am currently trying to use the java.util.zip.* package to perform lossless compression/Decompression. And I have used apache's jar to encode and decode the String used as an argument in Base64 charset. Following in my code with two static methods one each for compression and one for decompression. import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.zip.*; import org.apache.commons.codec.binary.Base64; public class main { public String compress

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . I'm really curious about that because nowadays every channel could modify or compress images some way which could be considered as a attack on steganography. We can divide steganography to two basic types, first operates on spatial domain of image and second operates on some

问题 this code show me an error i want to add selected image save to database and retrive i follow this 2 tutorials http://nizaqatali.wordpress.com/2011/06/21/android-dialog-select-image-from-gallery/ and this http://androidhub4you.blogspot.com/2012/09/hello-friends-today-i-am-going-to-share.html but this problem is come error message"The method compress(Bitmap.CompressFormat, int, ByteArrayOutputStream) is undefined for the type Uri" import org.apache.http.NameValuePair; import org.apache.http

问题 I'm getting used to Firebug and YSlow in particular. One of the things I'm looking at is the gzip compression. YSlow still gives my site an "F" and indicates that my CSS and JavaScript files are not being compressed. However, if I run an external gzip test against my site (such as http://www.gidnetwork.com/tools/gzip-test.php ) it tells me that gzip is working and gives me my savings, although I think this may just be the HTML. This is the relevant section of my .htaccess file: <IfModule mod

问题 I'm using mod_deflate on Apache 2.2 and the compression level is set to 9. I've fine tuned every possible aspects of the site based on the recommendations of YSlow (v2) and have managed to get an overall A grade (Total Score: 91) as well as on all categories except for: Make fewer HTTP requests ( Grade C - I'm still working on further unification of images) Compress components with gzip ( Grade F ) YSlow still reports back with a F and tells me to use gzip on my CSS and JS files. Here's a

问题 I have the first contiguous 2/3rds of a file that was compressed with zlib's deflate() function. The last 1/3 was lost in transmission. The original uncompressed file was 600KB. Deflate was called multiple times by the transmitter while chopping the original file into chunk sizes of 2KB and passing Z_NO_FLUSH until the end of file when Z_FINISH was passed. The resulting complete compressed file was transmitted, but partially lost as described. Is it possible to recover part of the original

问题 I am writing a utility class which converts strings from one alphabet to another, this is useful in situations where you have a target alphabet you wish to use, with a restriction on the number of characters available. For example, if you can use lower case letters and numbers, but only 12 characters its possible to compress a timestamp from the alphabet 01234567989 -: into abcdefghijklmnopqrstuvwxyz01234567989 so 2010-10-29 13:14:00 might become 5hhyo9v8mk6avy (19 charaters reduced to 16).

问题 Is it somehow possible to enable dynamic compression (for WCF-Services) on an IIS-Express? It's a development environment issue so I cannot use the full version: but I need to figure out how it would behave with compression. 回答1: Go to IIS Express installation folder (%programfiles%\IIS Express) and run the following command to enable dynamic compression. appcmd set config -section:urlCompression /doDynamicCompression:true Then add mime-types. Run following commands to add wildcard entries or

问题 I'm trying to create a ZIP archive with multiple text files as follows: Dictionary<string, string> Values = new Dictionary<string, string>(); using (var memoryStream = new MemoryStream()) { string zip = @"C:\Temp\ZipFile.zip"; foreach (var item in Values) { using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true)) { var file = archive.CreateEntry(item.Key + ".txt"); using (var entryStream = file.Open()) using (var streamWriter = new StreamWriter(entryStream)) {

问题 I have a few sites on a shared host that is running Apache 2. I would like to compress the HTML, CSS and Javascript that is delivered to the browser. The host has disabled mod_deflate and mod_gzip, so these options are out. I do have PHP 5 at my disposal, though, so I could use the gzip component of that. I am currently placing the following in my .htaccess file: php_value output_handler ob_gzhandler However, this only compresses the HTML and leaves out the CSS and JS. Is there a reliable way