Comments (5)
Difegue
commented on June 3, 2024
Thank you for the report - Would you happen to be able to share a small epub file that exhibits the problem so I can try it out?
I suspect we should look at the content.opf file when building the image list for epubs instead of just sorting by image name like we do with everything else.
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yihuasteven
commented on June 3, 2024
Hi,
Here is a small epub file.
The correct order is:
1. image/cover.jpg
2. image/vol-007881,jpg
3. image/vol-003600.jpg
4. image/vol-004248.jpg
5. image/vol-000962.jpg
6. image/vol-004233.jpg
7. image/vol-008535.jpg
8. image/vol-008906.jpg
9. image/vol-008719.jpg
10. image/vol-007116.jpg
11. image/vol-005270.jpg
12. image/vol-008993.jpg
13. image/vol-000458.jpg
14. image/createby.png
Thank you!
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Subject: Re: [Difegue/LANraragi] Page order are not correct while reading epub files (only contain imgaes) (Issue #788)
Thank you for the report - Would you happen to be able to share a small epub file that exhibits the problem so I can try it out?
I suspect we should look at the content.opf<https://ebooks.stackexchange.com/questions/1186/how-do-i-add-a-cover-and-other-pictures-to-my-epub> file when building the image list for epubs.
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Difegue
commented on June 3, 2024
@yihuasteven Sorry for the delay -- unfortunately you will need to upload the epub directly in this issue, attaching them via email does not work. Thanks!
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yihuasteven
commented on June 3, 2024
@yihuasteven Sorry for the delay -- unfortunately you will need to upload the epub directly in this issue, attaching them via email does not work. Thanks!
No problem, here is the equb file. Thanks.
SP-ABC.zip
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Difegue
commented on June 3, 2024
Had some time so I took a deeper look in the epub spec:
Annoyingly so, we can't just look at content.opf, since that name is not fixed in the spec and can be anything (it's vol.opf in the epub linked above, for example).
Instead, we have to first look at META-INF/container.xml to know the location of the OPF file:
<?xml version="1.0" encoding="UTF-8" ?>
<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
<rootfiles>
<rootfile full-path="vol.opf" media-type="application/oebps-package+xml" />
</rootfiles>
</container>
Then we can open and parse the OPF file to get the image order:
<?xml version="1.0" encoding="UTF-8" ?>
<package version="2.0" unique-identifier="MOXBID" xmlns="http://www.idpf.org/2007/opf">
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
[...]
</metadata>
<manifest>
<item id="ncx" href="xml/vol.ncx" media-type="application/x-dtbncx+xml"/>
<item id="Page_1" href="html/1.html" media-type="application/xhtml+xml"/>
<item id="Page_2" href="html/2.html" media-type="application/xhtml+xml"/>
<item id="Page_3" href="html/3.html" media-type="application/xhtml+xml"/>
<item id="Page_4" href="html/4.html" media-type="application/xhtml+xml"/>
<item id="Page_5" href="html/5.html" media-type="application/xhtml+xml"/>
<item id="Page_6" href="html/6.html" media-type="application/xhtml+xml"/>
<item id="Page_7" href="html/7.html" media-type="application/xhtml+xml"/>
<item id="Page_8" href="html/8.html" media-type="application/xhtml+xml"/>
<item id="Page_9" href="html/9.html" media-type="application/xhtml+xml"/>
<item id="Page_10" href="html/10.html" media-type="application/xhtml+xml"/>
<item id="Page_11" href="html/11.html" media-type="application/xhtml+xml"/>
<item id="Page_12" href="html/12.html" media-type="application/xhtml+xml"/>
<item id="Page_createby" href="html/createby.html" media-type="application/xhtml+xml"/>
<item id="Page_cover" href="html/cover.jpg.html" media-type="application/xhtml+xml"/>
<item id="cover_img" href="image/cover.jpg" media-type="image/jpeg" properties="cover-image" />
<item id="img_1" href="image/vol-000458.jpg" media-type="image/jpeg"/>
<item id="img_2" href="image/vol-008535.jpg" media-type="image/jpeg"/>
<item id="img_3" href="image/vol-004233.jpg" media-type="image/jpeg"/>
<item id="img_4" href="image/vol-007116.jpg" media-type="image/jpeg"/>
<item id="img_5" href="image/vol-008993.jpg" media-type="image/jpeg"/>
<item id="img_6" href="image/vol-007881.jpg" media-type="image/jpeg"/>
<item id="img_7" href="image/vol-000962.jpg" media-type="image/jpeg"/>
<item id="img_8" href="image/vol-008719.jpg" media-type="image/jpeg"/>
<item id="img_9" href="image/vol-008906.jpg" media-type="image/jpeg"/>
<item id="img_10" href="image/vol-004248.jpg" media-type="image/jpeg"/>
<item id="img_11" href="image/vol-003600.jpg" media-type="image/jpeg"/>
<item id="img_12" href="image/vol-005270.jpg" media-type="image/jpeg"/>
<item id="img_createby" href="image/createby.png" media-type="image/png"/>
<item id="css" href="css/style.css" media-type="text/css"/>
<item id="font01" href="misc/Courier.ttf" media-type="application/x-font-ttf"/>
</manifest>
<spine toc="ncx">
<itemref idref="Page_cover" />
<itemref idref="Page_1" />
<itemref idref="Page_2" />
<itemref idref="Page_3" />
<itemref idref="Page_4" />
<itemref idref="Page_5" />
<itemref idref="Page_6" />
<itemref idref="Page_7" />
<itemref idref="Page_8" />
<itemref idref="Page_9" />
<itemref idref="Page_10" />
<itemref idref="Page_11" />
<itemref idref="Page_12" />
<itemref idref="Page_createby" />
</spine>
<guide>
<reference type="cover" href="image/cover.jpg" title="封面" />
</guide>
</package>
Turns out that the OPF file itself doesn't contain the order of the images either, just the list of the images -- The actual order needs to be figured out by parsing the html files..
In this epub, the first image in the OPF file is image/vol-000458.jpg, but opening 1.html shows it's actually image/vol-007881.jpg. (what kind of madman does this i stg)
So basically, in order to have perfect image order support for epub, you need to implement the epub spec in full.
I'm going to put this in volunteers welcome, but I think it'd be quite an ordeal...
An EPUB Parser perl library could help here. (Alternatively, we could just use an epub reader javascript library in the front-end but that'd require a bunch of custom code as well)
In the meantime @yihuasteven, what I can recommend would be to use an OPDS Client alongside your LRR server (with page streaming turned off) - Most OPDS clients are designed for EPUBs and will download and parse the full file themselves.
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