Save a stream of bytes into a zip file

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Naum Derzhi 2022-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/1833843-save-a-stream-of-bytes-into-a-zip-file

评论： Naum Derzhi 2022-10-25

I need to save a large array, which I have in memory, compressing it while saving.

I can, of course, write the stream of bytes (e.g., use fopen->fwrite->fclose) into a temporary file and then zip this file (zip zipname.zip tempfilename). Bu this is inefficient. What I would like to do is to create a zip archive on disk without an intermediate file. For example, zip memory to memory, i.e. create the zip structure in memory (where the contents is my compressed array, and the file name is somehing I will provide), and then write this structure as a stream of bytes to <zipname.zip>.

Is this possible?

Any ideas will be deeply appreciated.

Thank you in advance

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Answer 1

dpb 2022-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/1833843-save-a-stream-of-bytes-into-a-zip-file#answer_1082213

PKZip was/is shareware, it should be possible to turn the code for it into a callable mex file that works from memory; it's quite possible somebody else has already done this but I didn't find it in a (very) quick search. But, <https://www.hanshq.net/zip.html> is a link that has a C implementation as starting point.

Something fast and ready-built is to just use the temporary file and call the packaged zip interface in MATLAB.