The simple approach would be to decompress the external ZIP file into a temporary file, and then open that temp ZIP file.

But it would be cleaner, from a purist point of view, to skip using temp files and uncompress the ZIP file directly into RAM.

And by the looks of it, it seems IO::Uncompress::Unzip can do just that:

A top-level function, unzip, is provided to carry out "one-shot" uncompression between buffers and/or files. (emphasis mine)

unzip $input => $output [, OPTS]
unzip expects at least two parameters, $input and $output.
If $input is a scalar reference, the input data will be read from $$input.
If $output is a scalar reference, the uncompressed data will be stored in $$output.
For OPTS, you'll need at least this — because a ZIP file can contain lots of files, and you have to select one:
Name => "membername"
Open "membername" from the zip file for reading.

In reply to Re: Reading a .txt file under 2 levels of compression by bart
in thread Reading a .txt file under 2 levels of compression by LazyIntern

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