02-10-2008, 06:54 PM | #31 | |
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Quote:
Dale |
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02-11-2008, 03:03 AM | #32 |
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Has anyone tried asking Mobi for a specification of the compression format?
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02-11-2008, 03:07 AM | #33 |
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I'd guess it would be some kind of huffman code, since that's optimal for data on which you have a good prior. See http://en.wikipedia.org/wiki/Huffman_coding
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02-11-2008, 03:53 AM | #34 |
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Mobipocket HuffDic compression
If someone can provide me with mobipocket files that use the HuffDic compression scheme, I could attempt to write a decoder, assuming the compression format isn't too complicated and/or it would take too much time to figure out how it works.
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02-11-2008, 04:02 AM | #35 |
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If you want to do such a thing then the easiest thing you can do is to get the free mobipocket creator from their website, generate a miniature book and compress it with various kinds including the c2 option so you can check how it proceeds from raw uncompressed to compressed state. Really, all you need you can download for free already.
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02-11-2008, 06:43 AM | #36 | |
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http://www.mobipocket.com/forum/view...=decompressing by DMcCunney but no answer. |
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02-11-2008, 10:43 AM | #37 |
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02-11-2008, 10:46 AM | #38 |
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02-11-2008, 06:05 PM | #39 |
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Thank-you, DarkNinja for liberating my DRMed books! Even with the flu I feel like dancing!
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02-12-2008, 12:35 PM | #40 |
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I wrote a decompressor for the new huffdic compressed files. Maybe this code can be incorporated into mobiperl?
Note. This program does not break any DRM encryption, so it's not illegal. It just decompresses files compressed with the new compression into a raw html file. Thanks to Igor Skochinsky for the valuable assistance. http://pastebin.com/m656dfbda Last edited by darkninja; 02-12-2008 at 05:51 PM. |
02-12-2008, 01:41 PM | #41 |
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Nice! However for the one from-the-wild compressed mobipocket book I have the trailing data-entries size calculation is obviously spurious (e.g. values like 251929435 bytes), which results in significant quantities of clipped text. Any chance you could take a second look at your algorithm / post details of how you derived the algorithm you do have?
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02-12-2008, 09:15 PM | #42 | |
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Quote:
Ironically for MobiPocket, this development would just result in more business from me as I would be less hesitant in buying more buying more Mobi books from now on. |
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02-13-2008, 12:31 PM | #43 |
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02-13-2008, 01:01 PM | #44 |
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Oooo - I see on your blog that you've also got an eReader to html converter. THAT one I'll have to go try! I have a *bunch* of eReader books, that I haven't all read yet and want to read on my Kindle.
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02-13-2008, 04:45 PM | #45 |
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hmmmmmm ... what about protected eReader books?
There's a book I *really* want to read, but it's only available in pbook or eReader format. Could I buy it from eReader and then convert it to html? *ohpleaseohpleaseohplease* EDIT: as I can see in another thread, your tool will do just that! excellent! Last edited by mores; 02-13-2008 at 04:55 PM. |
Tags |
conversion, drm, formatting, mobipocket |
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