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Old 05-14-2010, 11:29 AM   #1
ngukho
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Collections data format in 2.5 firmware

Managing collections on Kindle is painful and slow. However, if you dig into the new file system, you could find a "collections.json" at /mnt/us/system, which stores all the stuff related to collections data.

The "collections.json" is a standard json file. The only tricky part is how it identifies a document --- or what do those hashes come from. A little trial and error shows that they are merely the sha1 hash value of the document's absolute path, say a H.pdf is at the Kindle's documents directory, then its hash in collections.json would be sha1 hash of the string "/mnt/us/documents/H.pdf".

Voila, all that's needed for a PC-end collections manager is above. Anyone willing to contribute a GUI for this job? (-8

Last edited by ngukho; 05-14-2010 at 11:38 AM.
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Old 05-15-2010, 05:56 PM   #2
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Originally Posted by ngukho View Post
Managing collections on Kindle is painful and slow. However, if you dig into the new file system, you could find a "collections.json" at /mnt/us/system, which stores all the stuff related to collections data.
What is interesting is that deleting the file results in its immediate re-creation. From where??
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Old 05-20-2010, 11:54 AM   #3
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Couldn't you use calibre for the GUI?
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Old 05-20-2010, 05:58 PM   #4
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That is like the screensavers. You delete them from the kindle, and next time, they are back! Calibre doesnt set up the collections - the developers dont even have the upgrade yet.
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Old 06-18-2010, 01:56 PM   #5
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Quote:
Originally Posted by ngukho View Post
Managing collections on Kindle is painful and slow. However, if you dig into the new file system, you could find a "collections.json" at /mnt/us/system, which stores all the stuff related to collections data.

The "collections.json" is a standard json file. The only tricky part is how it identifies a document --- or what do those hashes come from. A little trial and error shows that they are merely the sha1 hash value of the document's absolute path, say a H.pdf is at the Kindle's documents directory, then its hash in collections.json would be sha1 hash of the string "/mnt/us/documents/H.pdf".

Voila, all that's needed for a PC-end collections manager is above. Anyone willing to contribute a GUI for this job? (-8
I have not been able to replicate this result. I am using OS X and the following command to generate the hash.

echo <Filepath> | openssl sha1

The result I get is the same length as the hash in the collections file but is not equal. Additionally, each item in my collections file has an asterisk before the hash, are others seeing this as well?
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Old 06-18-2010, 02:23 PM   #6
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Use echo -n

(no trailing linebreak) [Provided OS X's echo implementation is more or less the same as on Linux]

And yep, I also have an asterisk here.

Last edited by NiLuJe; 06-18-2010 at 02:25 PM.
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Old 06-18-2010, 02:41 PM   #7
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Use echo -n

(no trailing linebreak) [Provided OS X's echo implementation is more or less the same as on Linux]

And yep, I also have an asterisk here.
Still a different result. Here's the command I'm using

echo -n "/mnt/us/documents/hackermonthly-issue1.pdf" | openssl sha1
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Old 06-18-2010, 02:56 PM   #8
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Quote:
Originally Posted by schaefer View Post
Still a different result. Here's the command I'm using

echo -n "/mnt/us/documents/hackermonthly-issue1.pdf" | openssl sha1
That similar command line works for my collections on linux, and the above gives "1d71ee1d02b3a543980d690d8d4026a8be73e3ca" as does using sha1sum instead of openssl.

According to the Mac OS X man pages, echo is posix compatible and supports the -n flag as it should.
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Old 06-18-2010, 02:58 PM   #9
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Quote:
Originally Posted by clarknova View Post
That similar command line works for my collections on linux, and the above gives "1d71ee1d02b3a543980d690d8d4026a8be73e3ca" as does using sha1sum instead of openssl.

According to the Mac OS X man pages, echo is posix compatible and supports the -n flag as it should.
That's exactly the result I get as well, however it isn't the one that is in the collections.json file, hence my frustration.

EDIT:

Would other modifications have effected the way in which my DX creates the hashes? I have installed the updated screensaver hack.

Last edited by schaefer; 06-18-2010 at 03:11 PM.
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Old 06-18-2010, 03:51 PM   #10
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That's exactly the result I get as well, however it isn't the one that is in the collections.json file, hence my frustration.

EDIT:

Would other modifications have effected the way in which my DX creates the hashes? I have installed the updated screensaver hack.
Update: I just tried it with a few other files and I get the same hash as the Kindle creates. The difference I notice is that these other files don't have hyphens in the filename. Is it possible that the hyphen is causing the difference?
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Old 06-18-2010, 03:54 PM   #11
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Originally Posted by schaefer View Post
Update: I just tried it with a few other files and I get the same hash as the Kindle creates. The difference I notice is that these other files don't have hyphens in the filename. Is it possible that the hyphen is causing the difference?
Could be. It might be encoded. What's the hash supposed to be?

However, looking at mine, I have two files with hyphens, and they encode fine?
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Old 06-18-2010, 03:55 PM   #12
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Could be. It might be encoded. What's the hash supposed to be?
08636757653b8fe7a4f0fff42c4160c809aeba87
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Old 06-18-2010, 04:05 PM   #13
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Quote:
Originally Posted by schaefer View Post
08636757653b8fe7a4f0fff42c4160c809aeba87
Weird. I went and downloaded that pdf, and put it on my kindle (named exactly hackermonthly-issue1.pdf) and added to a collection and I see:
"*1d71ee1d02b3a543980d690d8d4026a8be73e3ca"

Just like the sha1 hash I get from the command line.

BTW - Thanks for pointing out the magazine, looks interesting.
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Old 06-18-2010, 04:12 PM   #14
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Originally Posted by clarknova View Post
Weird. I went and downloaded that pdf, and put it on my kindle (named exactly hackermonthly-issue1.pdf) and added to a collection and I see:
"*1d71ee1d02b3a543980d690d8d4026a8be73e3ca"

Just like the sha1 hash I get from the command line.

BTW - Thanks for pointing out the magazine, looks interesting.
Do you think it could be a Kindle 2 vs. DX difference? I may delete the collections and files and copy the files and try again when I can get back to my Kindle.

Last edited by schaefer; 06-18-2010 at 04:14 PM.
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Old 09-30-2010, 08:54 PM   #15
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Originally Posted by schaefer View Post
Do you think it could be a Kindle 2 vs. DX difference? I may delete the collections and files and copy the files and try again when I can get back to my Kindle.
Has anybody figured out what kind of escaping is applied to non-alphanumeric chars before applying sha1.
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