PRS-500 Is there java lib to create simple LRF?

ns66 · 07-25-2007, 12:23 AM

I am looking for java class/package/lib for the LRF creation, only the last step is needed (since I don't know the LRF format), I only need to convert txt to LRF, with table of content link, no pic, no special layout necessary

is there suck open source or code available?
or if not, is there document of LRF format available? I mean there are programs out there that can do it...

thanks a lot

kovidgoyal · 07-25-2007, 01:33 AM

there's python libraries: libprs500

ns66 · 07-25-2007, 08:05 PM

i don't know python

i am curious, how that python library is written, by reverse engineering? there got to be specs available?

kovidgoyal · 07-25-2007, 10:19 PM

google is your friend

ns66 · 07-26-2007, 01:09 PM

why your site libprs500.kovidgoyal.net always got a warning about untrusted security certificate

kovidgoyal · 07-26-2007, 01:21 PM

because I dont want to pay a certificate authority.

ns66 · 07-26-2007, 02:29 PM

i had my own domain before, the isp should take care of that as i recall never ran into that problem

kovidgoyal · 07-26-2007, 03:31 PM

https

beowulf573 · 07-26-2007, 11:12 PM

Quote:

Originally Posted by kovidgoyal

because I dont want to pay a certificate authority.

FYI, there's always CAcert, however the user does have to import the root certificate.

kovidgoyal · 07-28-2007, 03:55 PM

thanks.

CoryDog · 07-28-2007, 05:49 PM

I don't have anything this moment, but this weekend I did start writing an LRS/LRF round tripping tool in Scala which compiles to JVM byte code and works seamlessly with Java.
i.e., All you'll see is a jar file with an API.

(BTW if you currently code in Java. Stop, start coding in Scala.

)

Right now its not much more then the first "throw away" so I can get a feel for the LRF format. I think I got a handle on it, including the rather silly implementation of BlockSpace.

Attached is a zip which contains the Wizard of Oz original LRS from PRSLabs.com, and one I generated a couple of hours ago by decompiling Sony's LRF file . (When the code compiled, its all over the place now.) I attached my decompile log file.

I'm making steady progress thanks to the pre-work many have done in figuring out the LRF format. Thank you guys.

I also included a couple of key Scala source files for the interested.

OK, now for the real reason I'm posting. I'm loath to create yet another Source Forge project, yet, now that I'm going from POC to real stuff I'd like to get everything under source control. Does anyone who has a current Sony Reader software project in SF or Google code, etc... willing to share their SVN repository? I would not be checking in anything unrelated to my Sony Reader software and its GPL3.

I'm not writing yet a another format converter, but instead its a BBeB object model with LRF and LRS writers, and LRF, LRS readers with more reader / writers coming. The target is something more like BD.

[Note I removed attachement. Now need to waste space on pre-alpha code. First release in a month.]

Thanks,

Ray

kovidgoyal · 07-28-2007, 07:41 PM

Umm there already exists a library that represents LRS/F files with an object model. It's called pylrs was originally developed by Falstaff and is maintained by me as a part of libprs500. It's in python.

ns66 · 07-28-2007, 09:14 PM

i don't understand why new languages keep coming out, just a waste of time imho. from the early c, c++, to java, can do pretty much anything and it's very mature now, new language might have some benefit at the cost of others, but there's really nothing big to gain anyway, time spent to learn/adapt to a new language can be well spent developing real apps

anyway i think lots of ppl will benefit if there's a java writer available to wrap the lrf detail inside. thanks and looking forward to it

kovidgoyal · 07-28-2007, 09:21 PM

If you know how to program picking up a new language should be trivial. Duplicating effort endlessly is a total waste of time.

ns66 · 07-29-2007, 02:50 AM

the many languages existed means lots of time wasted duplicating work and porting/learning

07-25-2007, 12:23 AM	#1
ns66 Connoisseur Posts: 78 Karma: 156 Join Date: Jul 2007 Device: sony reader	Is there java lib to create simple LRF? I am looking for java class/package/lib for the LRF creation, only the last step is needed (since I don't know the LRF format), I only need to convert txt to LRF, with table of content link, no pic, no special layout necessary is there suck open source or code available? or if not, is there document of LRF format available? I mean there are programs out there that can do it... thanks a lot

07-28-2007, 05:49 PM	#11
CoryDog Member Posts: 22 Karma: 44 Join Date: Jul 2007 Device: Sony EReader PRS-500	LRF/LRS Java Lib I don't have anything this moment, but this weekend I did start writing an LRS/LRF round tripping tool in Scala which compiles to JVM byte code and works seamlessly with Java. i.e., All you'll see is a jar file with an API. (BTW if you currently code in Java. Stop, start coding in Scala. ) Right now its not much more then the first "throw away" so I can get a feel for the LRF format. I think I got a handle on it, including the rather silly implementation of BlockSpace. Attached is a zip which contains the Wizard of Oz original LRS from PRSLabs.com, and one I generated a couple of hours ago by decompiling Sony's LRF file . (When the code compiled, its all over the place now.) I attached my decompile log file. I'm making steady progress thanks to the pre-work many have done in figuring out the LRF format. Thank you guys. I also included a couple of key Scala source files for the interested. OK, now for the real reason I'm posting. I'm loath to create yet another Source Forge project, yet, now that I'm going from POC to real stuff I'd like to get everything under source control. Does anyone who has a current Sony Reader software project in SF or Google code, etc... willing to share their SVN repository? I would not be checking in anything unrelated to my Sony Reader software and its GPL3. I'm not writing yet a another format converter, but instead its a BBeB object model with LRF and LRS writers, and LRF, LRS readers with more reader / writers coming. The target is something more like BD. [Note I removed attachement. Now need to waste space on pre-alpha code. First release in a month.] Thanks, Ray Last edited by CoryDog; 07-30-2007 at 03:16 PM.

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07-25-2007, 01:33 AM	#2
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	there's python libraries: libprs500

07-25-2007, 08:05 PM	#3
ns66 Connoisseur Posts: 78 Karma: 156 Join Date: Jul 2007 Device: sony reader	i don't know python i am curious, how that python library is written, by reverse engineering? there got to be specs available?

07-25-2007, 10:19 PM	#4
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	google is your friend

07-26-2007, 01:09 PM	#5
ns66 Connoisseur Posts: 78 Karma: 156 Join Date: Jul 2007 Device: sony reader	why your site libprs500.kovidgoyal.net always got a warning about untrusted security certificate

07-26-2007, 01:21 PM	#6
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	because I dont want to pay a certificate authority.

07-26-2007, 02:29 PM	#7
ns66 Connoisseur Posts: 78 Karma: 156 Join Date: Jul 2007 Device: sony reader	i had my own domain before, the isp should take care of that as i recall never ran into that problem

07-26-2007, 03:31 PM	#8
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	https

07-28-2007, 03:55 PM	#10
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	thanks.

07-28-2007, 07:41 PM	#12
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Umm there already exists a library that represents LRS/F files with an object model. It's called pylrs was originally developed by Falstaff and is maintained by me as a part of libprs500. It's in python.

07-28-2007, 09:14 PM	#13
ns66 Connoisseur Posts: 78 Karma: 156 Join Date: Jul 2007 Device: sony reader	i don't understand why new languages keep coming out, just a waste of time imho. from the early c, c++, to java, can do pretty much anything and it's very mature now, new language might have some benefit at the cost of others, but there's really nothing big to gain anyway, time spent to learn/adapt to a new language can be well spent developing real apps anyway i think lots of ppl will benefit if there's a java writer available to wrap the lrf detail inside. thanks and looking forward to it

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07-28-2007, 09:21 PM	#14
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	If you know how to program picking up a new language should be trivial. Duplicating effort endlessly is a total waste of time.

07-29-2007, 02:50 AM	#15
ns66 Connoisseur Posts: 78 Karma: 156 Join Date: Jul 2007 Device: sony reader	the many languages existed means lots of time wasted duplicating work and porting/learning