trouble opening epub

jloh · 02-28-2022, 10:51 PM

Moderator: if this is not the correct place to post this please feel free to move this post to the appropriate forum.

Hello, I finally made it here after using Calibre for a while (5+ years). But I have a general question. There are books in epub format that I can't seem to open in Calibre, but I can in fbreader.
It is an epub file and not a zip file. I can tell you that some of the fonts are missing when I open it in fbreader. Could this be due to missing fonts?

I'm using Debian Bookworm on a i7-8550U, if that helps.

Without telling you which book it is, I can give you the output of the error:

calibre, version 5.37.0
ERROR: Loading book failed: Failed to open the book at ... Click "Show details" for more info.

Failed to convert book: ... with error:
InputFormatPlugin: EPUB Input running
on ...
EPUB appears to be invalid ZIP file, trying a more forgiving ZIP parser
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Traceback (most recent call last):
File "calibre/ebooks/conversion/plugins/epub_input.py", line 259, in convert
File "calibre/utils/zipfile.py", line 774, in __init__
File "calibre/utils/zipfile.py", line 809, in _GetContents
File "calibre/utils/zipfile.py", line 824, in _RealGetContents
calibre.utils.zipfile.BadZipfile: File is not a zip file

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "runpy.py", line 194, in _run_module_as_main
File "runpy.py", line 87, in _run_code
File "site.py", line 45, in <module>
File "site.py", line 41, in main
File "calibre/utils/ipc/worker.py", line 196, in main
File "<string>", line 1, in <module>
File "calibre/srv/render_book.py", line 823, in viewer_main
File "calibre/srv/render_book.py", line 814, in render_for_viewer
File "calibre/srv/render_book.py", line 791, in render
File "calibre/ebooks/oeb/iterator/book.py", line 62, in extract_book
File "calibre/customize/conversion.py", line 242, in __call__
File "calibre/ebooks/conversion/plugins/epub_input.py", line 266, in convert
File "calibre/utils/localunzip.py", line 252, in extractall
File "calibre/utils/localunzip.py", line 234, in _extractall
File "calibre/utils/localunzip.py", line 177, in copy_compressed_file
ValueError: Invalid ZIP file, local header is damaged

kovidgoyal · 03-01-2022, 12:53 AM

Those errors you posted indicate the filesyoua re trying to open are damaged/not actual epub files.

jloh · 03-01-2022, 03:48 AM

ok thank you. I'll just use fbreader on them then.

BetterRed · 03-01-2022, 04:24 AM

@jloh - FTR: EPUBs are rebadged ZIPS with some rules about internal contents

BR

jhowell · 03-01-2022, 09:12 AM

Perhaps the file is actually some other ebook format with an incorrect .epub extension and fbreader is opening it based on the content rather than the file name.

That is just a guess. I don’t know anything about fbreader.

02-28-2022, 10:51 PM	#1
jloh Junior Member Posts: 2 Karma: 10 Join Date: Feb 2022 Device: none	trouble opening epub Moderator: if this is not the correct place to post this please feel free to move this post to the appropriate forum. Hello, I finally made it here after using Calibre for a while (5+ years). But I have a general question. There are books in epub format that I can't seem to open in Calibre, but I can in fbreader. It is an epub file and not a zip file. I can tell you that some of the fonts are missing when I open it in fbreader. Could this be due to missing fonts? I'm using Debian Bookworm on a i7-8550U, if that helps. Without telling you which book it is, I can give you the output of the error: calibre, version 5.37.0 ERROR: Loading book failed: Failed to open the book at ... Click "Show details" for more info. Failed to convert book: ... with error: InputFormatPlugin: EPUB Input running on ... EPUB appears to be invalid ZIP file, trying a more forgiving ZIP parser Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main() Traceback (most recent call last): File "calibre/ebooks/conversion/plugins/epub_input.py", line 259, in convert File "calibre/utils/zipfile.py", line 774, in __init__ File "calibre/utils/zipfile.py", line 809, in _GetContents File "calibre/utils/zipfile.py", line 824, in _RealGetContents calibre.utils.zipfile.BadZipfile: File is not a zip file During handling of the above exception, another exception occurred: Traceback (most recent call last): File "runpy.py", line 194, in _run_module_as_main File "runpy.py", line 87, in _run_code File "site.py", line 45, in <module> File "site.py", line 41, in main File "calibre/utils/ipc/worker.py", line 196, in main File "<string>", line 1, in <module> File "calibre/srv/render_book.py", line 823, in viewer_main File "calibre/srv/render_book.py", line 814, in render_for_viewer File "calibre/srv/render_book.py", line 791, in render File "calibre/ebooks/oeb/iterator/book.py", line 62, in extract_book File "calibre/customize/conversion.py", line 242, in __call__ File "calibre/ebooks/conversion/plugins/epub_input.py", line 266, in convert File "calibre/utils/localunzip.py", line 252, in extractall File "calibre/utils/localunzip.py", line 234, in _extractall File "calibre/utils/localunzip.py", line 177, in copy_compressed_file ValueError: Invalid ZIP file, local header is damaged Last edited by jloh; 02-28-2022 at 10:53 PM. Reason: incorrect debian version

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03-01-2022, 12:53 AM	#2
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Those errors you posted indicate the filesyoua re trying to open are damaged/not actual epub files.

03-01-2022, 03:48 AM	#3
jloh Junior Member Posts: 2 Karma: 10 Join Date: Feb 2022 Device: none	ok thank you. I'll just use fbreader on them then.

03-01-2022, 04:24 AM	#4
BetterRed null operator (he/him) Posts: 21,718 Karma: 29711016 Join Date: Mar 2012 Location: Sydney Australia Device: none	@jloh - FTR: EPUBs are rebadged ZIPS with some rules about internal contents BR

03-01-2022, 09:12 AM	#5
jhowell Grand Sorcerer Posts: 7,070 Karma: 91577715 Join Date: Nov 2011 Location: Charlottesville, VA Device: Kindles	Perhaps the file is actually some other ebook format with an incorrect .epub extension and fbreader is opening it based on the content rather than the file name. That is just a guess. I don’t know anything about fbreader.

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