[Kobo] Bad magic number for central directory

richstant · 02-27-2021, 03:35 AM

Hi, I've just bought a new Kobo H2O, and am transferring all my books at once. However when I try this, it fails out with the following error log:

calibre, version 5.10.1
ERROR: Error: Error communicating with device

Error -3 while decompressing data: invalid stored block lengths

Traceback (most recent call last):
File "calibre\ebooks\oeb\polish\container.py", line 1183, in __init__
File "calibre\utils\zipfile.py", line 775, in __init__
File "calibre\utils\zipfile.py", line 810, in _GetContents
File "calibre\utils\zipfile.py", line 850, in _RealGetContents
calibre.utils.zipfile.BadZipfile: Bad magic number for central directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "calibre\gui2\device.py", line 89, in run
File "calibre\gui2\device.py", line 592, in _upload_books
File "calibre_plugins.kobotouch_extended.device.driver" , line 406, in upload_books
File "calibre\devices\kobo\driver.py", line 2129, in upload_books
File "calibre_plugins.kobotouch_extended.device.driver" , line 217, in _modify_epub
File "calibre_plugins.kobotouch_extended.container" , line 129, in __init__
File "calibre\ebooks\oeb\polish\container.py", line 1190, in __init__
File "calibre\utils\localunzip.py", line 253, in extractall
File "calibre\utils\localunzip.py", line 235, in _extractall
File "calibre\utils\localunzip.py", line 180, in copy_compressed_file
zlib.error: Error -3 while decompressing data: invalid stored block lengths

I'm assuming it's a corrupted book, because if I start going a few books at a time, they transfer fine. However I've got several thousand books, and by trying to transfer a few hundred at a time, it's clear that this error occurs with several books. So how do I work out which book it is? The only alternative is to transfer 2-3 books at a time, which will take ages!!

davidfor · 02-27-2021, 05:06 AM

Run calibre in debug mode and send the books. When you close calibre, the debug log will be shown. That should have enough information to show which book was being sent when the error happened.

mbovenka · 03-01-2021, 10:05 AM

Another option is (installing and) using the Count Pages plugin to compute a book length of some sort. It will fail to do so on books that are corrupted, and you can then filter the corrupted books out that way.

richstant · 03-06-2021, 05:06 AM

Thanks both, I'll try those now!

02-27-2021, 03:35 AM	#1
richstant Member Posts: 24 Karma: 10 Join Date: Oct 2013 Device: Kindle	[Kobo] Bad magic number for central directory Hi, I've just bought a new Kobo H2O, and am transferring all my books at once. However when I try this, it fails out with the following error log: calibre, version 5.10.1 ERROR: Error: Error communicating with device Error -3 while decompressing data: invalid stored block lengths Traceback (most recent call last): File "calibre\ebooks\oeb\polish\container.py", line 1183, in __init__ File "calibre\utils\zipfile.py", line 775, in __init__ File "calibre\utils\zipfile.py", line 810, in _GetContents File "calibre\utils\zipfile.py", line 850, in _RealGetContents calibre.utils.zipfile.BadZipfile: Bad magic number for central directory During handling of the above exception, another exception occurred: Traceback (most recent call last): File "calibre\gui2\device.py", line 89, in run File "calibre\gui2\device.py", line 592, in _upload_books File "calibre_plugins.kobotouch_extended.device.driver" , line 406, in upload_books File "calibre\devices\kobo\driver.py", line 2129, in upload_books File "calibre_plugins.kobotouch_extended.device.driver" , line 217, in _modify_epub File "calibre_plugins.kobotouch_extended.container" , line 129, in __init__ File "calibre\ebooks\oeb\polish\container.py", line 1190, in __init__ File "calibre\utils\localunzip.py", line 253, in extractall File "calibre\utils\localunzip.py", line 235, in _extractall File "calibre\utils\localunzip.py", line 180, in copy_compressed_file zlib.error: Error -3 while decompressing data: invalid stored block lengths I'm assuming it's a corrupted book, because if I start going a few books at a time, they transfer fine. However I've got several thousand books, and by trying to transfer a few hundred at a time, it's clear that this error occurs with several books. So how do I work out which book it is? The only alternative is to transfer 2-3 books at a time, which will take ages!!

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02-27-2021, 05:06 AM	#2
davidfor Grand Sorcerer Posts: 24,905 Karma: 47303824 Join Date: Jul 2011 Location: Sydney, Australia Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos	Run calibre in debug mode and send the books. When you close calibre, the debug log will be shown. That should have enough information to show which book was being sent when the error happened.

03-01-2021, 10:05 AM	#3
mbovenka Wizard Posts: 2,086 Karma: 14079267 Join Date: Oct 2007 Location: Almere, The Netherlands Device: Kobo Sage	Another option is (installing and) using the Count Pages plugin to compute a book length of some sort. It will fail to do so on books that are corrupted, and you can then filter the corrupted books out that way.

03-06-2021, 05:06 AM	#4
richstant Member Posts: 24 Karma: 10 Join Date: Oct 2013 Device: Kindle	Thanks both, I'll try those now!

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