zlib

How to download and unzip a zip file in memory in NodeJs?

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You need a library that can handle buffers. The latest version of adm-zip will do: npm install adm-zip My solution uses the http.get method, since it returns Buffer chunks. Code: var file_url=”http://notepad-plus-plus.org/repository/7.x/7.6/npp.7.6.bin.x64.zip”; var AdmZip = require(‘adm-zip’); var http = require(‘http’); http.get(file_url, function(res) { var data = [], dataLen = 0; res.on(‘data’, function(chunk) { data.push(chunk); dataLen … Read more

How to decompress Gzip string in ruby?

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The above method didn’t work for me. I kept getting incorrect header check (Zlib::DataError) error. Apparently it assumes you have a header by default, which may not always be the case. The work around that I implemented was: require ‘zlib’ require ‘stringio’ gz = Zlib::GzipReader.new(StringIO.new(resp.body.to_s)) uncompressed_string = gz.read

Python: Inflate and Deflate implementations

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You can still use the zlib module to inflate/deflate data. The gzip module uses it internally, but adds a file-header to make it into a gzip-file. Looking at the gzip.py file, something like this could work: import zlib def deflate(data, compresslevel=9): compress = zlib.compressobj( compresslevel, # level: 0-9 zlib.DEFLATED, # method: must be DEFLATED -zlib.MAX_WBITS, … Read more

Compression formats with good support for random access within archives? [closed]

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Take a look at dictzip. It is compatible with gzip and allows coarse random access. An excerpt from its man page: dictzip compresses files using the gzip(1) algorithm (LZ77) in a manner which is completely compatible with the gzip file format. An extension to the gzip file format (Extra Field, described in 2.3.1.1 of RFC … Read more

zlib.error: Error -3 while decompressing: incorrect header check

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You have this error: zlib.error: Error -3 while decompressing: incorrect header check Which is most likely because you are trying to check headers that are not there, e.g. your data follows RFC 1951 (deflate compressed format) rather than RFC 1950 (zlib compressed format) or RFC 1952 (gzip compressed format). choosing windowBits But zlib can decompress … Read more

no module named zlib

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Sounds like you need to install the devel package for zlib, probably want to do something like # ubuntu 12,14,16,18,20.04+ sudo apt-get install zlib1g-dev Instead of using python-brew you might want to consider just compiling by hand, it’s not very hard. Just download the source, and configure, make, make install. You’ll want to at least … Read more

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