Thread: Extract HTML files, fix, re-import?
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Old 08-30-2024, 03:56 AM   #1
Shohreh
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Question [SOLVED] Extract HTML files, fix, re-import?
Hello,

I need to fix typos in an EPUB file that actually originated from the "OCR layer" in a PDF. The EPUB was created by Abbyy Finereader.

For some reason, LibreOffice can't open the file* while Sigil can after complaining**… but the latter doesn't seem to have an English/French spellchecker.

As an alternative, and provided LO's spellchecker is good enough, I'm thinking of 1) extracting the HTML files from the EPUB, 2) open them in LO to fix errors, and 3) re-import and replace the HTML files into the EPUB.

Before I experiment, should it work?

Thank you.


* LibreOffice: "The file 'output.epub' is corrupt and therefore cannot be opened. LibreOffice can try to repair the file. The corruption could be the result of document manipulation or of structural document damage due to data transmission. We recommend that you do not trust the content of the repaired document. Execution of macros is disabled for this document." followed by "The file 'output.epub' could not be repaired and therefore cannot be opened."

** Sigil: "Warning: This EPUB had HTML files that were not well formed or are missing a DOCTYPE, html, head or body elements. They were automatically fixed based on your Preference setting to Clean on Open."

--
Edit: Done. I found LibreOffice's spellchecker to be very good, and simple to use: Hit F7 to display the dialog box and run it, edit the typo in the text, click back on the dialog to hit its Resume button, repeat.

To edit the files:
  1. Make a copy of the original EPUB, replacing its .epub extension with .zip
  2. Unzip the HTML files
  3. Edit in LO
  4. In the zip, update the HTML files
  5. Rename the extension from .zip to .epub
  6. Voilà!

---
Edit: False hope. The file crashes when opened in my e-reader. After opening it in Sigil, OKing the error message mentioned above, saving a new version, and opening that in my e-reader… it still crashes. Could there be some references that must be updated in eg. toc.ncx, content.opf, and/or .\META-INF\container.xml?

Are those references in toc.ncx generated by hashing files, which then must re-generated somehow after editing?

Code:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1" xml:lang="fr-FR">
<head><meta name="dtb:uid" content="Id_BC4AD4AE-749C-47E3-A5CE-DC60A911137F_"/></head>
<docTitle><text>Some title</text></docTitle>
<navMap>
<navPoint playOrder="1" id="Id_C492A9F4-4D63-47EE-9234-532796CC95EA_"><navLabel><text>Préface</text></navLabel><content src="main-1.xhtml"/></navPoint>
<navPoint playOrder="2" id="Id_E03E00CF-3CDD-48E5-8311-8F6DE332770F_"><navLabel><text>Avant-propos</text></navLabel><content src="main-2.xhtml"/></navPoint>
<navPoint playOrder="3" id="Id_C4FDB976-C07F-448A-BE62-4560285EEEAA_"><navLabel><text>PREMIÈRE PARTIE</text></navLabel><content src="main-3.xhtml"/></navPoint>
<navPoint playOrder="4" id="Id_A88231ED-D7FC-4804-8A24-4351BE895135_"><navLabel><text>Blah</text></navLabel><content src="main-4.xhtml"/></navPoint>
<navPoint playOrder="5" id="Id_C1C631F1-2D1C-485A-B140-AE634C0473CE_"><navLabel><text>TROISIÈME PARTIE</text></navLabel><content src="main-5.xhtml"/></navPoint>
<navPoint playOrder="6" id="Id_3248876C-83BE-4A77-9C11-44E6BC0C1AFB_"><navLabel><text>Blah</text></navLabel><content src="main-6.xhtml"/></navPoint>
<navPoint playOrder="7" id="Id_D6E9CD24-5C8D-4CCC-8F32-4793DEA2717B_"><navLabel><text>Blah</text></navLabel><content src="main-7.xhtml"/></navPoint>
<navPoint playOrder="8" id="Id_E57324AE-A971-4076-A55C-C5CB583F7831_"><navLabel><text>Blah</text></navLabel><content src="main-8.xhtml"/></navPoint>
<navPoint playOrder="9" id="Id_64E0916D-A264-4267-892B-857FDBF415F7_"><navLabel><text>Blah</text></navLabel><content src="main-9.xhtml"/></navPoint>
<navPoint playOrder="10" id="Id_F38A984B-B739-4CF2-B943-B87D94524516_"><navLabel><text>Table des figures et tableaux</text></navLabel><content src="main-10.xhtml"/></navPoint>
</navMap></ncx>
---
Edit: epubcheck shows (non-fatal) errors in the EPUB generated by Abbyy, and fatal errors after I ) extracted, 2) edited (in LibreOffice), and 3) replaced XHTML files back into the EPUB :-/ The file displays OK in SumatraPDF, but crashes my e-reader.

Code:
-------- EPUB from PDF by Abbyy:
<repInfo uri="From.Abbyy.epub">
	<format>application/epub+zip</format>
	<version>2.0.1</version>
	<status>Not well-formed</status>
	<messages>
		 <message id="PKG-005" severity="error">PKG-005, ERROR, [The mimetype file has an extra field of length 17. The use of the extra field feature of the ZIP format is not permitted for the mimetype file.], /c:/From.Abbyy.epub</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: element "a" not allowed here; expected the element end-tag or element "address", "blockquote", "del", "div", "dl", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "ins", "noscript", "ns:svg", "ol", "p", "pre", "script", "table" or "ul" (with xmlns:ns="http://www.w3.org/2000/svg")], main.xhtml (17-135)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: element "ul" not allowed here; expected the element end-tag or element "li"], main.xhtml (20-193)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: The "a" element cannot contain any nested "a" elements.], main-2.xhtml (48-22)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote2"], main-2.xhtml (8-526)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote8"], main-2.xhtml (17-476)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote8"], main-2.xhtml (17-1374)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote3"], main-4.xhtml (12-817)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote15"], main-6.xhtml (18-1233)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote5"], main-7.xhtml (11-419)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote5"], main-7.xhtml (13-139)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote24"], main-7.xhtml (30-759)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote27"], main-7.xhtml (33-426)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote23"], main-9.xhtml (24-880)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote1"], main-13.xhtml (10-354)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote6"], main-13.xhtml (24-1021)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote20"], main-13.xhtml (54-252)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote25"], main-14.xhtml (21-278)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote44"], main-14.xhtml (43-1912)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote60"], main-15.xhtml (43-573)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote90"], main-15.xhtml (65-1401)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote12"], main-17.xhtml (19-1466)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: Duplicate "footnote14"], main-17.xhtml (24-1397)</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: value of attribute "id" is invalid; must be an XML name without colons], toc.ncx (6-69)</message>
	</messages>
</repInfo>

-------- EPUB after editing in LibreOffice:
<repInfo uri="From.Abbyy.EDITED.epub">
	<format>application/epub+zip</format>
	<version>2.0.1</version>
	<status>Not well-formed</status>
	<messages>
		 <message id="RSC-016" severity="error">RSC-016, FATAL, [Fatal Error while parsing file: The entity "nbsp" was referenced, but not declared.], main-3.xhtml (59-33)</message>
		 <message id="HTM-004" severity="error">HTM-004, ERROR, [Irregular DOCTYPE: found "", expected "&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" 
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"&gt;".], main-1.xhtml</message>
		 <message id="RSC-005" severity="error">RSC-005, ERROR, [Error while parsing file: elements from namespace "" are not allowed], main-1.xhtml (2-7)</message>
	</messages>
</repInfo>
Last edited by Shohreh; 08-30-2024 at 09:00 AM.
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