Re: Re: [PDFdev] unable to decode lzw

[atul garg]

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Thanks Leonard..

As far as legal issues are concerned..there is not any problem..

now let me explain a little of what im doing..
i read one byte after the stream keyword (the carriage return) 
and
then read the "length" (read from the stream dictionary) bytes in 
a
buffer and pass this buffer to the decoding function provided by 
the
library.
now the problem is that buffer is not decoded and i get the error 
"bad
compressed format.."
i have done similar in case of flate also and the buffer gets 
decoded
appropriately..

thanks in advance,
atul
On Tue, 16 Sep 2003 Leonard Rosenthol wrote :
PDFdev is a service provided by PDFzone.com | 
http://www.pdfzone.com
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At 4:58 AM +0000 9/16/03, atul garg wrote:
I am working on an application to decode and reencode the 
encoded
data
in the pdf..and am using third party encoding/decoding libraries 
for
this.
OK.


now the problem is..I am not able to decode the lzw buffer in 
pdf..
First the legal issues:

Are you located in the United States or elsewhere?  If you are
outside the US, have you verified that the LZW patent has expired 
in
your area or have you acquired a license?
Now the technical:

Without knowing EXACTLY what these "3rd party libraries" are 
doing
and what your code does, it is quite difficult/impossible to 
help.
Make sure you are reading the correct info from teh PDF and 
placing it
back as well - no headers, watch the space around 
stream/endstream,
etc.


Leonard
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Leonard Rosenthol
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