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Old 01-05-2022, 12:41 PM   #1
PenguinClaw
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how does calibre uncompress files?
to my understanding, compressed files (lets say epub for now) aren't readable until they are uncompressed. However I would like to be able to access the text files that are zipped within the epub to locate where certain bookmarks or other bits are. please assume im at a beginner level at programming
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Old 01-05-2022, 01:07 PM   #2
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What do you mean with "how does calibre uncompress files"?

EPUB files are plain simple ZIP files. You can rename them to .zip and open them in Windows Explorer. Or with any other program or library that can open ZIP files.
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Old 01-05-2022, 02:04 PM   #3
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Calibre also includes the U(npack) module. Simply select a book and tap 'U"

(cancel when done to avoid changes being stored)
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Old 01-05-2022, 02:11 PM   #4
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If you are writing a calibre plugin you can use the standard Python zipfile module.
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Old 01-05-2022, 08:31 PM   #5
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Quote:
Originally Posted by jhowell View Post
If you are writing a calibre plugin you can use the standard Python zipfile module.
Or you can use the calibre libraries and handle the epub as an epub. Depending on what they are actually trying to do, that could be the best thing.

@PenguinClaw: Without a better idea of what you are doing, we can't give a better answer than this. If you are just curious about how an epub is constructed, use the unpack function or just unpack it with your favourite tool. Or, look at it in the editor. If you are planning to do something where you navigate to a point in the book and make a change or extract something, then you should look at the calibre libraries. And there are examples of doing this in different plugins.
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