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Unzipping a uint8 array

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Marco Rossi
Marco Rossi 2018-9-24
评论： Sean de Wolski 2019-12-2
Goodmorning sirs,
I am accessing with 'webread' to a zip file located on a webserver. This zip file contains few tens of xml files. The webread function returns an array of uint8 (ascii code of the zip file I guess). Is there any method to unzip it directly on the workspace?
Thanks in advance for the support.

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回答（3 个）

ANKUR KUMAR
ANKUR KUMAR 2018-9-24
Use unzip(zipfilename) unzip(zipfilename,directory)
Reference: http://matlab.izmiran.ru/help/techdoc/ref/unzip.html
  1 个评论
Stephen23
Stephen23 2018-9-24
Marco Rossi's "Answer" moved here:
well, unzip(webread('www....')) does not seem to work, since webread returns an array of uint8. Is there a way to unzip a uint8 array (corresponding to the ascii of a zip file) without creating the physical zip file?

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Walter Roberson
Walter Roberson 2018-9-24
There are Java based methods to unzip from memory streams. MATLAB's unzip uses some of the relevant methods and you can also see them in how readtable works on xlsx files.
However, it does not make complete sense to unzip an XML into the workspace. Are you looking for it to be converted to a character vector or for it to be parsed into data?
  1 个评论
Stephen23
Stephen23 2018-9-24
Marco Rossi's "Answer" moved here:
I am mostly interested in getting the xml string for the moment (maybe a single string merging the content of all the files). I am trying to look at the java libraries used by Matlab to unzip, but it seems to be not so straightforward.

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Sean de Wolski
Sean de Wolski 2018-9-24
Use websave instead:
tempzipname = [tempname '.zip']
websave(tempzipname, url);
deleter = onCleanup(@()delete(tempzipname));
unzip(tempzipname)
You can also use tempname to generate a folder to unzip to, and then xmlread or fileread to read it in.
  2 个评论
Marc Youcef
Marc Youcef 2019-11-30
I think this was not what the author was asking in the first time. He (and me as well) - We are looking for a way to unzip to ram without using file system for decompression.
I found some info here https://undocumentedmatlab.com/blog/savezip-utility but could not get an implementation out of it. If anyone has an idea please share.
Would be great to have an evolved version of unzip function which takes a byte array as input and byte array output.
Sean de Wolski
Sean de Wolski 2019-12-2
Marc, that seems like a fair enhancement request. I put an enhancement in to development for it.

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