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Re: zlib_uncompress usage(more info)
On Thu, 2004-05-06 at 08:52, Thomas Koeller wrote:
> Zlib needs _huge_ buffers in RAM. A description of how to
> estimate the amount of ram required can be found in
> packages/services/compress/zlib/current/include/zconf.h.
Or look at how RedBoot does it.
>
> tk
>
>
> John Newlin wrote:
> > Most likely you need to skip around the gzip header (or strip the header
> > prior to programming the image into flash)
> >
> > If you have the zlib code, look in gzio.c for the function check_header
> > as an example
> >
> > -john
> >
> > bhanuprakash kandimalla wrote:
> > >Just want to put some more info to my previous mail.
> > >
> > >Hello Ecos World:
> > >Did any one use the zlib uncompress function. This
> > >funtion has the following structure:uncompress(dest,
> > >dest_len, source, source_len). Is there anylimit on
> > >the souce_len to use. I have a compressed image stored
> > >in boot flash and want to uncompress onto RAM. The
> > >source file is of 177768 bytes. Some how when I use
> > >this function, it always returns Z_MEM_ERROR. (I used
> > >the Cygwin tool to create the compressed image
> > >(gzip)).
> > >
> > >>>This Z_MEM_ERROR is returning from inflate_blocks()
> > >
> > >function. What does this mean...
> > >
> > >Can someone suggest me where I am doing wrong. I
> > >appreciate any help.
> > >Thanks in advance
> > >
> > >
> > >
> > >
> > >__________________________________
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>
> --
> --------------------------------------------------
>
> Thomas Koeller, Software Development
> Basler Vision Technologies
>
> thomas dot koeller at baslerweb dot com
> http://www.baslerweb.com
>
> ==============================
--
Gary Thomas <gary@mlbassoc.com>
MLB Associates
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