gzip | 易学教程

How to change deflate stream output format(raw, zlib, gzip) when use zlib?

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问题 Zlib can output three format, I try to search the docs and zlib.h , but can't find a clear explanation about the options, anyone have any ideas? 回答1: From the zlib.h documentation of deflateInit2() : windowBits can also be -8..-15 for raw deflate. In this case, -windowBits determines the window size. deflate() will then generate raw deflate data with no zlib header or trailer, and will not compute a check value. windowBits can also be greater than 15 for optional gzip encoding. Add 16 to

Swift gzipped response

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问题 I've serialized a JSON response in my Swift app and the parsed result is a single byte array { d = ( 31, 139, 8, 0, 0, 9, 110, 136, 0, 255, 236, 125, how do I decode this byte array into actual data i can work with? here is my swift code that fetches and parses the response `func getWRHPSData(completionHandlerForPOST: @escaping (_ result: AnyObject?, _ error: NSError?) -> Void) -> Void { let request = NSMutableURLRequest(url: createURL()) request.httpMethod = "POST" request.addValue("gzip,

multi cpu core gzip a big file

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问题 How can I use all cpu cores in my server(has 4 cores) linux Debian over OpenVZ to gzipping faster one big file ? I am trying to use these commands but I can not put the pieces together get number of cores CORES=$(grep -c '^processor' /proc/cpuinfo) this for split big file in more split -b100 file.big this for use gzip command with multiple core find /source -type f -print0 | xargs -0 -n 1 -P $CORES gzip --best I don't know if this is the best way for optimize gzip process of big files.. 回答1:

Why do pickle + gzip outperform h5py on repetitive datasets?

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问题 I am saving a numpy array which contains repetitive data: import numpy as np import gzip import cPickle as pkl import h5py a = np.random.randn(100000, 10) b = np.hstack( [a[cnt:a.shape[0]-10+cnt+1] for cnt in range(10)] ) f_pkl_gz = gzip.open('noise.pkl.gz', 'w') pkl.dump(b, f_pkl_gz, protocol = pkl.HIGHEST_PROTOCOL) f_pkl_gz.close() f_pkl = open('noise.pkl', 'w') pkl.dump(b, f_pkl, protocol = pkl.HIGHEST_PROTOCOL) f_pkl.close() f_hdf5 = h5py.File('noise.hdf5', 'w') f_hdf5.create_dataset('b',

Why do pickle + gzip outperform h5py on repetitive datasets?

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python 解压压缩包

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转 http://m.blog.csdn.net/blog/wice110956/26597179# 这里讨论使用Python解压如下五种压缩文件： .gz .tar .tgz .zip .rar 简介 gz：即gzip，通常只能压缩一个文件。与tar结合起来就可以实现先打包，再压缩。 tar： linux系统下的打包工具，只打包，不压缩 tgz：即tar.gz。先用tar打包，然后再用gz压缩得到的文件 zip：不同于gzip，虽然使用相似的算法，可以打包压缩多个文件，不过分别压缩文件，压缩率低于tar。 rar：打包压缩文件，最初用于DOS，基于window操作系统。压缩率比zip高，但速度慢，随机访问的速度也慢。关于zip于rar之间的各种比较，可见： http://www.comicer.com/stronghorse/water/software/ziprar.htm gz 由于gz一般只压缩一个文件，所有常与其他打包工具一起工作。比如可以先用tar打包为XXX.tar,然后在压缩为XXX.tar.gz 解压gz，其实就是读出其中的单一文件，Python方法如下： import gzip import os def un_gz(file_name): """ungz zip file""" f_name = file_name.replace(".gz", "")

Get size of uncompressed gzip file while size of compressed file is available from server

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问题 I am using GZIPInputStream to download PDF file. I want to show the download progress of the file on a UI button. But, I am not getting the actual size of the file, what I am getting is compressed size due to which I am unable to show the correct download progress. This download progress is exceeding 100 as the actual file size is greater than the compressed size of file. Header content of file from server: Following info I receive from server, from which I am using content-length which is

File extension of zlib zipped html page?

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问题 What does a zipped html file using zlib (deflate) look like sitting on the server? Does it have a different extension than .html? 回答1: Depending on your webserver settings, it is also possible to zip the html files in advance, in addition to having the webserver automatically zip them. Usually the extension is .gz, eg MyPage.html becomes MyPage.html.gz. With the right settings, if someone requests http://example.com/MyPage.html, and Apache sees MyPage.html.gz, and the client supports

Using Wcf with gzip compression

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问题 We have a wcf service that takes large amount of data. As a requirement we want to take the request objects gzipped and response them using the same compression. How can I do this? I couldn't find any document describing this issue. How can I develop a wcf soap service that works like that and how to consume this kind of services? 回答1: Microsoft has a sample that demonstrates this (you can compile their code, and simply plug it into your application) GZip Encoder Sample There is a more

can't untar a complete directory using tar -cvpzf

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问题 Banging my head on this one... I used tar -cvpzf file.tar.gz to compress a complete directory. I move the file to another server and i try to decompress the directory where i have copied the archive. Can't make it work. bash-3.2$ tar -xvpzf news.tar.gz . tar: gzip: Cannot exec: No such file or directory tar: Error is not recoverable: exiting now tar: Child returned status 2 tar: .: Not found in archive tar: Error exit delayed from previous errors Anyone ? 回答1: Your tar can't find gzip. If you