https://bugs.kde.org/show_bug.cgi?id=458289
Bug ID: 458289
Summary: Table of Contents pages always point to page 1
Product: okular
Version: 22.08.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: EPub backend
Assignee: okular-de...@kde.org
Reporter: duane-t...@evenson.ca
Target Milestone: ---
Created attachment 151575
--> https://bugs.kde.org/attachment.cgi?id=151575&action=edit
simple demonstration epub
SUMMARY
The toc.ncx content line references to filename as a URI (percent-encoded),
this breaks on Okular.
The solution is change Okular to decode the percent-encoded filename so it
references the right file in the epub zip.
STEPS TO REPRODUCE
1. create "c,.html"
<html><body><h1>Chapter 1</h1><h1>Chapter 2</h1></body></html>
2. use
ebook-convert "c,.html" "c,.epub" --no-default-epub-cover
to create a new epub
3. open in Okular
OBSERVED RESULT
All pages in the TOC point to page 1
EXPECTED RESULT
Different entries should have different pages (1, 2, etc.)
SOFTWARE/OS VERSIONS
Linux: Arch Linux 5.19.3-arch1-1
ADDITIONAL INFORMATION
In the above example, within the epub zip, ebook-convert creates
c,_split_000.html and c,_split_001.html
toc.ncx:
The spec for the table of contents file, toc.ncx, are to use URI for the
references to the files[1] which requires percent encoding for all characters
other than [a-zA-Z0-9-._~][2][3]
the toc.ncx file has the line:
<content src="c%2c_split_000.html"/>
I suspect Okular is looking for the file "c%2c_split_000.html" instead of
"c,_split_000.html" and not finding it, places a 1 for the page number.
Hand-editing the toc.ncx file so it has the line:
<content src="c,_split_000.html"/>
allows Okular to work right, but the epub then is not standard.
The solution is change Okular to decode the percent-encoded file name so it
references the right file.
references:
[1] see <content> section in
https://daisy.org/activities/standards/daisy/daisy-3/z39-86-2005-r2012-specifications-for-the-digital-talking-book/#NCXElem
[2] go to paragraphs with "percent-encoded" in
https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
[3] https://www.rfc-editor.org/rfc/rfc3986#page-12
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