Exported Epub Has Errors & Missing Chapters

[xeolod]

Steps to reproduce

1. Download Any Paid Epub from webbnoØvaal. Here is the exported epub.
2. Export the downloaded chapters to epub.
3. Open in calibre / any other epub reader.
4. The exported epub contains many errors when checked via calibre e-book editor check errors button.

Expected behavior

---

Only in exported epub

1. The exported epub to not have any errors and chapters missing in it.

Both Exported Epub and in lnreader

3. The TOC should have "Chapter Number : Chapter Name".

• Chapter 1 : Chapter aaaaaa.
• Chapter 2 : Chapter bbbbb.

4. The TOC of paid chapters should not have lock icon visible beside them.

Actual behavior

---

Only in exported epub

1. The exported epub has some chapters missing in it; even though all the downloaded chapters are viewable in lnreader while offline.
2. The exported epub has many errors when checked via calibre e-book editor check book button.

Both Exported Epub and in lnreader

3. The TOC has "Volume Number : Chapter Name", instead of "Chapter Number : Chapter Name".

• Volume 1 : Chapter aaaaaa.
• Volume 1 : Chapter bbbbb.

4. The TOC of paid chapters have lock icon visible beside them.

LNReader version

2.0.0-beta.3

Android version

Android 8.1

Device

Galaxy J7 Prime

Other details

No response

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• I have written a short but informative title.
• If this is an issue with a source, I should be opening an issue in the sources repository.
• I have updated the app to version 2.0.0.
• I will fill out all of the requested information in this form.

[buthub]

I've finally figured out why some epubs fail and why some chapters will be skipped in an epub reader!

It's all because of the unallowable characters! If the story title has a character like : in it, then the epub will fail to export. You can get past this by simply editing the title with "Edit Info" to remove the characters likely to cause it to fail (almost always punctuation characters, I assume).

Similarly, in the structuring, the epub format does not allow ID's or idref's that include certain characters like quotation marks (in the opf or toc files??) that were derived from the chapter titles (the length of those chapter titles might also matter?); hence, these chapters will be skipped. Please fix, as soon as possible. Thank you for everyone's hard work.