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- #!/usr/bin/env bash
- set -euo pipefail # bash strict mode
- file --mime-type -b -- "$1" | grep -q ^application/zip$ || { echo not application/zip ; exit 1 ;}
- basedir="$(dirname -- "$1")" &&
- original="$(basename -- "$1" .epub)" &&
- cd -- "$basedir" &&
- twd="$(mktemp -d -- "$original".XXXX)" &&
- cd -- "$twd" &&
- unzip -q ../"$original".epub &&
- zip -0XrD -q out.epub mimetype &&
- zip -0XrD -q out.epub * -x mimetype -x out.epub &&
- mv out.epub ../"$original"_fix.epub &&
- cd .. &&
- rm -rf -- "$twd"
- # I had a lot of epubs that were made incorrectly by whoever uploaded them to the internet.
- # They claimed to be application/zip instead of application/epub+zip.
- # So I had to fix them before reading them with certain apps. I copied how to do that from stackoverflow,
- # then added just enough automation that it can be run from an external loop or 'find -exec'.
- # Remember: Epub is a zip, but it contains a mimetype file which must be added first and must not be
- # compressed even if the other zipped files are compressed.
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