compression

问题 I am compressing string. And the compressed string sometimes having NULL character inside before the end NULL. I want to return the string till the end null.But the compressor function is returning the sting till the occurring of the first NULL. Please help me. char* compressor(char* str) { char *compressed_string; //After some calculation compressed_string="bk`NULL`dk";// at the last here is automatic an NULL we all know return compressed_string; } void main() { char* str; str=compressor(

问题 I'm making a dictionary compressor in C with dictionary max size 64000. Because of this, I'm storing my entries as 16-bit integers. What I'm currently doing: To encode 'a', I get its ASCII value, 97, and then convert this number into a string representation of the 16-bit integer of 97. So I end up encoding '0000000001100001' for 'a', which obviously isn't saving much space in the short run. I'm aware that more efficient versions of this algorithm would start with smaller integer sizes (less

问题 I've got a large number of integer arrays. Each one has a few thousand integers in it, and each integer is generally the same as the one before it or is different by only a single bit or two. I'd like to shrink each array down as small as possible to reduce my disk IO. Zlib shrinks it to about 25% of its original size. That's nice, but I don't think its algorithm is particularly well suited for the problem. Does anyone know a compression library or simple algorithm that might perform better

问题 Is anyone can provide example how to create zip file from csv file using Python/Pandas package? Thank you 回答1: Use df.to_csv('my_file.gz', compression='gzip') From the docs: compression : string, optional a string representing the compression to use in the output file, allowed values are ‘gzip’, ‘bz2’, ‘xz’, only used when the first argument is a filename See discussion of support of zip files here. 回答2: In response to Stefan's answer, add '.csv.gz' for the zip csv file to work df.to_csv('my

问题 I am using django templating, and for readability I have html that looks similar to the following: {% if some_variable %} text {% else %} nothing exists here {% endif %} {% for item in set %} {% if forloop.first %} ...etc... It converts to the following html at runtime, which includes tons of whitespace and returns: text <div> <li class='some_class > some text </li> </div> etc... Some pages even run to ~3,000 lines of html when viewing the page source. Is there a tool to compress this html at

问题 I am using a code snippet from this page on how to create a zip file and add and a compress a directory to that zip file. I am running the following on Windows 7 but it does not seem to create the zip file at all. BSTR bstrFolderOutName = L"C:\\Test\\Archive.zip"; BYTE startBuffer[] = {80, 75, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; FILE *f = _wfopen(bstrFolderOutName, L"wb"); fwrite(startBuffer,sizeof(startBuffer),1,f); fclose(f); 回答1: The stated problem, that no file is

问题 I encountered the Unsupported Image Type error due to an incompatible colour profile using com.sun.imageio.plugins.jpeg.JPEGImageReader . I later found the TwelveMonkeys plugins that are proven to fix this issue and have referenced the dependent .jars in my project classpath. I downloaded them from the TwelveMonkeys github repository. Note i'm using version 3.0.2 because I'm running on Java 6 with JDK 1.6.0_45. These are the .jars I've added to my project: common-lang-3.0.2.jar common-io-3.0

问题 One of the big deals in Silverlight v4 is audio/video capture... but I haven't found an example yet that does what I want to do. So: How do you capture audio/video with Silverlight (from a webcam), and then save it as a compressed format (WMV or MP4)? The idea here is to upload it after compression. Have already looked at this blog post for the capture piece, but need to find a way to compress audio/video for upload. 回答1: Silverlight does not support video encoding and more likely this won't

问题 For any given file data size, I want to be able to resize (or compress) a UIImage to fit within that data limit. This question is NOT about how to resize, or how to check file sizes... it is about an algorithm to getting this in a performant way. Searching here already, I found this thread which talks about stepping down the image jpeg quality in a linear, or binary algorithm. This isn't very performant, taking dozens of seconds at best. I am working on iOS so images can be close to 10MB

问题 I am working on Android app. I am compressing recorded video clarity to send it to server. The maximum lenght of video is of 30 sec. I am able to upload the video from the phones having 2 or 3 MP. But unable to upload from the phones having 8 MP like Samsung S3 or S2 or grand.. screen keeps on loading (which means uploading). Any once please help me how to compress video to maximum level. My code: File mediaFile = new File( MediaStore.Images.Media.EXTERNAL_CONTENT_URI.getPath() + "/IRCMS