tiny JFFS2 Reader

tiny JFFS2 Reader

[sriram neelakandan]

Hi group,
I am looking for a tiny jffs2 reader that can read a file from a 
jffs2 partition..
the code in jffs2reader.c in the MTD utils tar
mtd-20000704.tar.gz (hope this is the latest)
does not have the logic to read beyond the first node of the 
file.
basically the following func is called and it doesnt read beyond 
the first inode !
--snip--
putblock(char *b, size_t bsize, size_t * rsize,
 			  struct jffs2_raw_inode *n)
{
 	uLongf dlen = n->dsize;

if (*rsize < n->isize)
 		bzero(b + *rsize, n->isize - *rsize);

 	switch (n->compr) {
 	case JFFS2_COMPR_ZLIB:
 		uncompress((Bytef *) b + n->offset, &dlen,
 				   (Bytef *) ((char *) n) + sizeof(struct jffs2_raw_inode),
 				   (uLongf) n->csize);
 		break;

 	case JFFS2_COMPR_NONE:
 		memcpy(b + n->offset,
 			   ((char *) n) + sizeof(struct jffs2_raw_inode), dlen);
 		break;

 	case JFFS2_COMPR_ZERO:
 		bzero(b + n->offset, dlen);
 		break;

 		/* [DYN]RUBIN support required! */

 	default:
 		fprintf(stderr, "Unsupported compression method!\n");
 		exit(EXIT_FAILURE);
 	}

 	*rsize = n->isize;
}



How to get the compelete file from the partition? any ideas or is 
there any other code.

i looked at the actual JFFS2 kernel code , it uses pretty huge 
inode caches which is initted  during sys_mount...but i cant 
afford to put the MTD & FS code in my tiny bootloader!

TIA
sriram
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Re: tiny JFFS2 Reader

[Tino Keitel]

On Sat, Aug 10, 2002 at 16:30:19 -0000, sriram  neelakandan wrote:
> Hi group,
> I am looking for a tiny jffs2 reader that can read a file from a 
> jffs2 partition..
> the code in jffs2reader.c in the MTD utils tar
> mtd-20000704.tar.gz (hope this is the latest)
> does not have the logic to read beyond the first node of the 
> file.

There was a project called load_kernel at
http://russ.dhs.org/load_kernel.html, but this web server doesn't exist
anymore. It contains all code to look for a file called "linux" on a
cramfs oder jffs2 image and read it (including zlib decompression).
Maybe you want to contact the author (try Russ.Dill@asu.edu). I could
also send you the archive.

Regards,
Tino

-- 
tino.keitel@innominate.com
dipl.-inf.                        Innominate Security Technologies AG
software engineer                                   networking people
tel: +49.30.6392-3308                      http://www.innominate.com/

Re: tiny JFFS2 Reader

[Sylvain Meunier]

> > On Sat, Aug 10, 2002 at 16:30:19 -0000, sriram  neelakandan wrote:
> > Hi group,
> > I am looking for a tiny jffs2 reader that can read a file from a
> > jffs2 partition..
> > the code in jffs2reader.c in the MTD utils tar
> > mtd-20000704.tar.gz (hope this is the latest)
> > does not have the logic to read beyond the first node of the
> > file.
...

Hi

Look for ppcboot sources, this is a bootloader that know about jffs2 (it
can acces any level of
directory and load a file).

Sylvain

Re: tiny JFFS2 Reader

[Russ Dill]

On Sun, 2002-08-11 at 23:55, Tino Keitel wrote:
> On Sat, Aug 10, 2002 at 16:30:19 -0000, sriram  neelakandan wrote:
> > Hi group,
> > I am looking for a tiny jffs2 reader that can read a file from a 
> > jffs2 partition..
> > the code in jffs2reader.c in the MTD utils tar
> > mtd-20000704.tar.gz (hope this is the latest)
> > does not have the logic to read beyond the first node of the 
> > file.
> 
> There was a project called load_kernel at
> http://russ.dhs.org/load_kernel.html, but this web server doesn't exist
> anymore. It contains all code to look for a file called "linux" on a
> cramfs oder jffs2 image and read it (including zlib decompression).
> Maybe you want to contact the author (try Russ.Dill@asu.edu). I could
> also send you the archive.

it exists, it just moved to port 8000, also, the code is in blob cvs

RE: tiny JFFS2 Reader

[Hicks, Jamey]

> -----Original Message-----
> From: Tino Keitel [mailto:tino.keitel@innominate.com]
> Sent: Monday, August 12, 2002 2:56 AM
> To: linux-mtd@lists.infradead.org
> Subject: Re: tiny JFFS2 Reader
> 
> 
> On Sat, Aug 10, 2002 at 16:30:19 -0000, sriram  neelakandan wrote:
> > Hi group,
> > I am looking for a tiny jffs2 reader that can read a file from a 
> > jffs2 partition..
> > the code in jffs2reader.c in the MTD utils tar
> > mtd-20000704.tar.gz (hope this is the latest)
> > does not have the logic to read beyond the first node of the 
> > file.
> 
> There was a project called load_kernel at
> http://russ.dhs.org/load_kernel.html, but this web server 
> doesn't exist
> anymore. It contains all code to look for a file called "linux" on a
> cramfs oder jffs2 image and read it (including zlib decompression).
> Maybe you want to contact the author (try Russ.Dill@asu.edu). I could
> also send you the archive.

This code has also been incorporated into our bootldr: http://www.handhelds.org/feeds/bootldr has binaries and source.

Jamey