deflate

问题 In my app I need to Decompress data written by DataContractSerializer to compression Deflate Stream in another app, edit the decompressed data and Compress it again. Decompression works fine, but not for data compressed by me. The problem is that when I do this: byte[] result = Compressor.Compress(Compressor.Decompress(sourceData)); the length of the result byte array is different than sourceData array. For example: string source = "test value"; byte[] oryg = Encoding.Default.GetBytes(source)

问题 I'm writing a small proxy in Java that basically picks out 2 specific files and does some extra processing on them. One URL it just grabs some info out of the content before passing it along. The other file I want to filter the response content, which is just xml deflate encoded (I want to remove some child elements). Now, the proxy works fine when I just pass though all content. However, when I try to filter the xml file it doesn't actually send the content to the client ??? Here is some

问题 I am trying to debug the issue of why my pages are not being GZIP'ed or deflated according to YSLOW. I ended up enabling Failed Request Logs on the server and was able to see the failed reason of why it is not compressing, it thinks it is already compressed. DYNAMIC_COMPRESSION_NOT_SUCCESS Reason="ALREADY_CONTENT_ENCODING" I have enabled dynamic and static compression in IIS, I have also changed the web.config file to include the following. <httpCompression directory="%SystemDrive%\inetpub

问题 It seems that couchdb automatically compress all its _attachments when requested with the correct header. But unfortunately this doesn't happen for views, show or lists. Is there any way to achieve a compression before returning the result to the client? Is using a third party library like deflatejs (didn't test it yet) a bad approach? Thanks 回答1: You can certainly use js-deflate in show and list functions, but you cannot do it in view functions. I also suspect it would be inefficient (just a

问题 Which compression method is better? I've heard lots of back and forth about GZip being more widely used, but Deflate being faster (in some instances). Is there an accepted standard on which one to use and why? 回答1: UPDATE According to the latest updates to the linked question, one should use GZip. See http://www.vervestudios.co/projects/compression-tests/results Old Answer Deflate is better. 回答2: Answers: http://www.stardeveloper.com/articles/display.html?article=2008111201&page=1 http://blog

问题 I'm writing some scripts that are using the HTML 5 file API in FireFox 3.6. I got some deflated (compressed) files, and I need to inflate (uncompress) them. I found a few scripts while googling, but none of them have tests. So I'm a bit reluctant to use them. My question is: Browsers can inflate. Can I somehow piggyback on the inflation by forging A XHR request? Or piggyback in any other way? Keep in mind, the script is currently FireFox 3.6 exclusive. It can't be an extension, though, I want

问题 I have a ServiceStack service that compresses the response using RequestContext.ToOptimizedResult() , e.g.: [Route("/numbers/search")] public class FindNumbers { } public object Get(FindNumbers query) { var data = new List<string> { "One", "Two", "Three" }; return RequestContext.ToOptimizedResult(data); } This works perfectly when issuing a request like: GET http://myhost:13487/numbers/search.json And is compressed as expected with the Accept-Encoding request header: Accept-Encoding: gzip

问题 I'm working on a solution to my other question which is reading the data in the 'zTXt' chunks of a PNG. I am as far as locating the chunks in the file, and reading the zTXt's keyword. I'm having trouble reading the compressed portion of zTXt. I've never worked with the DeflateStream object before, and am having some trouble with it. When reading, it appears to expect the length parameter to be in 'uncompressed' bytes. In my case however, I only know the length of the data in 'compressed'

问题 java.util.zip.GZIPOutputStream does not provide a constructor argument or a setter for the compression level of its underlying Deflater . There are ways to work around this issue, as described here, for example: GZIPOutputStream gzip = new GZIPOutputStream(output) { { this.def.setLevel(Deflater.BEST_COMPRESSION); } }; I GZIPped a 10G file with this and its size didn't decrease by a single bit compared to using the preset DEFAULT_COMPRESSION. The answer to this question says that under certain

问题 I'm trying to decompress a file that was compressed using the DEFLATE algorithm and stuff it into a vector<unsigned char> . From the research I've done so far, it seemed like I could use a boost::iostreams::filtering_streambuf and then use boost::iostreams::copy() to get it into a boost::interprocess::basic_vectorstream<std::vector<unsigned char>> and then pull the underlying vector out of the vectorstream. However, I'm getting a ton of compiler errors, starting with this: /usr/include/boost