zlib

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 I need to uncompress a git object which is compressed with zlib. Although the object is compressed with zlib it has no header(to save bandwidth I guess). So I'm trying to add the header on top of the object bytes but for some reasons zlib still complains that the header is not valid. I suspect the header bytes are added as string literal instead of bytes but I'm not sure. See the code below. package main import( "compress/zlib" "io/ioutil" "bytes" "fmt" // "strings" ) func main(){ b, err :=

问题 in my program i have to unzip downloaded file ... i read libz.dylib is used for that but i didn't find any documentation or examples how to do that..? any one know this... Thanks in advance.... 回答1: I'm not exactly answering your question, but you could use ZipKit. It is an Obj-C framework for using zip files. 来源： https://stackoverflow.com/questions/2729529/how-to-use-libz-dylib-to-unzip-zip-file

问题 This question continues the discussion started here. I found out that the HTTP response body can't be unmarshaled into JSON object because of deflate compression of the latter. Now I wonder how can I perform decompression with Golang. I will appreciate anyone who can show the errors in my code. Input data I've dumped the HTTP response body into the 'test' file. Here is it: $ cat test x��PAN�0� ;��NtJ�FӮdU�|"oVR�C%�f�����Z.�^Hs�dW뮑�'��DH�S�SFVC����r)G,�����<���z}�x_g�+�2��sl�r/�Oy>��J3\�G�9��

问题 I would like to deflate a small block of memory (<= 16 KiB) using zlib. The output is stored in a block of memory as well. No disk or database access here. According to the documentation, I should call deflate() repeatedly until the whole input is deflated. In between, I have to increase the size of the memory block where the output goes. However, that seems unnecessarily complicated and perhaps even inefficient. As I know the size of the input, can't I predetermine the maximum size needed

问题 I have an opportunity to preset dictionary for deflate compression. It makes sense in my case, because data to be compressed is relatively small 1kb-3kb and I have a large sample of representative examples. Data to be compressed consists of arbitrary sequence of bytes, so tokenization etc. is not a good way to go. Also, data shows a lot of repetition (between data examples), so good dictionary could potentially give very good results. The question is how calculate good dictionary? Is there an

问题 I am setting up my GDAL 1.8.0 Project in Visual Studio 2010 Windows, I am on way to add libpng to project. My libpng release libs are under following folder... They are successfully built with zlib in this folder, as you can see there are no files missing as per VTP site. D:\libpng-16 And I have also changed additional libraries file names. Even though I added path in Property Manager, this error is still coming. Still I am getting following error Thank You in advance. 回答1: you should give

问题 I spent a few days reading zlib (and gzip and deflate) RFC and I can say they are kind of rubbish. Quite some details are missing, so I'm opening this question. I'm trying to parse a zlib data and I need to know some details about the header. First of all, RFC says there will be 2 bytes, CMF and FLG . CMF is divided in 2 4 bits sections. The first one is CM and the second one is CINFO . What are the possible values of CM ? RFC says that 8 means deflate and that 15 is reserved, but what about

问题 I'm trying to decompress data compressed with zlib algorithm in C# using 2 most legitimate libraries compatible with zlib algorithm and I got similar exception thrown. Using DotNetZip: Ionic.Zlib.ZlibException: Bad state (invalid stored block lengths) Using Zlib.Net: inflate: invalid stored block lenghts but using same data as input to zlib-flate command on linux using only default parameters, works great and decompressed without any warnings (output is correct): zlib-flate -uncompress < .

问题 I am using deflate function in zlib library to compress the file. How can I determine the size of the compressed file? Is it the element total_out that indicates the size of compressed file? 回答1: If you are using deflate() correctly, then you are accumulating or writing the compressed output, and can add up the number of output bytes yourself. At each call, the amount of output is strm.avail_out before the deflate() call minus strm.avail_out after the call. See zpipe.c for an example of the