[GUI Plugin] KindleUnpack - The Plugin

[DiapDealer]

Originally Posted by JSWolf

So it is Calibre's Tweak Book that is undoing the obfuscation in the KF8 and not the plugin. Thanks for the explanation.

You're quite welcome. But I did explain all this to you last time you brought it up (starting at post #32 of this thread).

[JSWolf]

Originally Posted by DiapDealer

You're quite welcome. But I did explain all this to you last time you brought it up (starting at post #32 of this thread).

But this time, I noticed that I was able to Tweak Book and the fonts would be normal. So I thought the plugin was doing something to the fonts in the new version. Now I know it's Calibre doing it's magic to make the fonts readable.

[pdurrant]

Fascinating. I thought that the calibre team was very keen on not doing anything with DRM. IMO, obfuscation counts as DRM, or more precisely, "a technological measure that effectively controls access to a work".

[DoctorOhh]

I see we're moving a bit off topic so ... DiapDealer thanks for packaging this as a plugin.

Originally Posted by pdurrant

Fascinating. I thought that the calibre team was very keen on not doing anything with DRM. IMO, obfuscation counts as DRM, or more precisely, "a technological measure that effectively controls access to a work".

I'm not sure if this is applicable, but this is what Kovid said to Jon a couple of days ago about obfuscated fonts.

Originally Posted by kovidgoyal

If they are obfuscated in the azw3 then they will be obfuscated in the epub output. calibre simply preserves the obfuscation status of the font. It does the same thing for epub to epub conversions as well. Though IIRC it does not do it for epub to azw3 conversions, mainly because doing so is technically difficult and I cant be bothered figuring it out, given that fonts are obfuscated enough by the very design of azw3.

[pdurrant]

Originally Posted by DoctorOhh

I'm not sure if this is applicable, but this is what Kovid said to Jon a couple of days ago about obfuscated fonts.

Ah. But see the flaw? Convert ePub to azw3 and then azw3 to ePub, and the obfuscation is gone. Naughty calibre!

[kovidgoyal]

Originally Posted by pdurrant

Ah. But see the flaw? Convert ePub to azw3 and then azw3 to ePub, and the obfuscation is gone. Naughty calibre!

You mean as opposed to viewing the epub with the viewer and then copying the unobfuscated fonts out of the temp files? Or running an epub to epub conversion with the debug pipeline option and copying the font files out of the debug directory. Obfuscation is a joke, and a pretty poor one at that. So while I will take reasonable steps to preserve obfuscation, there are limits to how many hoops I am willing to jump through.

[pdurrant]

Originally Posted by kovidgoyal

You mean as opposed to viewing the epub with the viewer and then copying the unobfuscated fonts out of the temp files? Or running an epub to epub conversion with the debug pipeline option and copying the font files out of the debug directory. Obfuscation is a joke, and a pretty poor one at that. So while I will take reasonable steps to preserve obfuscation, there are limits to how many hoops I am willing to jump through.

Entirely your decision. I would just note that doing conversions using the normal interface of calibre is a bit different to the scenarios you mentioned.

[kovidgoyal]

Originally Posted by pdurrant

Entirely your decision. I would just note that doing conversions using the normal interface of calibre is a bit different to the scenarios you mentioned.

The debug pipeline option is part of the normal conversion interface in calibre, see the "Debug" section of the conversion dialog.

[jignesh21]

when i try to extract pdf from azw4 i get this error
calibre, version 0.9.20
ERROR: Unhandled exception: <b>Exception</b>:Problem locating unpacked pdf.

Traceback (most recent call last):
File "calibre_plugins.kindleunpack_plugin.extractio n", line 224, in print_replica
File "calibre_plugins.kindleunpack_plugin.utilities ", line 275, in getPDFFile
Exception: Problem locating unpacked pdf.

[jignesh21]

when i tried again i got following error
calibre, version 0.9.20
ERROR: Unhandled exception: <b>MemoryError</b>:

Traceback (most recent call last):
File "calibre_plugins.kindleunpack_plugin.extractio n", line 224, in print_replica
File "calibre_plugins.kindleunpack_plugin.utilities ", line 265, in getPDFFile
File "calibre_plugins.kindleunpack_plugin.kindleunpack. kindleunpack", line 1489, in unpackBook
File "calibre_plugins.kindleunpack_plugin.kindleunpack. kindleunpack", line 1090, in process_all_mobi_headers
File "calibre_plugins.kindleunpack_plugin.kindleunpack. kindleunpack", line 975, in getRawML
MemoryError

[pdurrant]

I suspect that you don't have much free memory, and a very big PDF. The scripts aren't optimised for memory use.

[jignesh21]

what should i do
i tried on three different computers and i getting same errors
thanks

[JSWolf]

Originally Posted by jignesh21

what should i do
i tried on three different computers and i getting same errors
thanks

If you are using a 64-bit OS, try the the plugin with the 64-bit version of Calibre and see if that solves the problem.

[jignesh21]

thanks for your help
it worked like charm

[JSWolf]

Originally Posted by jignesh21

thanks for your help
it worked like charm

With Windows, the 32-bit version is limited to 3GB of memory and the 64-bit version is not.