Ben Finney <ben+deb...@benfinney.id.au> writes:

> Dan Ritter <d...@randomstring.org> writes:
>
>> However, you probably don't need to go that far. EPUB is HTML
>> in a ZIP file. Unzip it, then deal with HTML as you wish.
>
> Many EPub files that I find, don't open correctly in Evince (the default
> Gnome document viewer). Are there various formats that call themselves
> EPub?

evince cannot handle epub (application/epub+zip).  Do you have files
calling themselves epub which have a different format (as reported by
file --magic)?

My epub files (created using calibre) are zip archive that look
something like this:

  Length      Date    Time    Name
---------  ---------- -----   ----
       20  2015-12-17 11:37   mimetype
        0  2015-12-17 11:37   META-INF/
      244  2015-12-17 11:37   META-INF/container.xml
       58  2015-12-17 11:37   page_styles.css
        0  2015-12-17 11:37   text/
    50343  2015-12-17 11:37   text/part0021.html
    .....
    35082  2015-12-17 11:37   text/part0026.html
    35839  2015-12-17 11:37   cover.jpeg
     7122  2015-12-17 11:37   content.opf
     3958  2015-12-17 11:37   stylesheet.css
      799  2015-12-17 11:37   titlepage.xhtml
        0  2015-12-17 11:37   images/
    39480  2015-12-17 11:37   images/00003.jpeg
    88262  2015-12-17 11:37   images/00002.jpeg
     7794  2015-12-17 11:37   toc.ncx
---------                     -------

The mimetype file in the zip contains, of course, the string
"application/epub+zip".

--
regards,
kushal

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