From: Ryan Davis <ryand-ruby@...>
Date: 2010-03-22T17:20:20+09:00
Subject: Re: Decompressing LZW compression from PDF file


On Mar 22, 2010, at 00:32 , Ahmad Azizan wrote:

> With a small input, I can decompress the it to get the equivalent output
> like the python code.
> e.g:
> Python
> data = "\x80\x0b\x60\x50\x22\x0c\x0c\x85\x01"
> tmp = LZWDecode(data)
> print tmp
> 
> data = "\x80\x0b\x60\x50\x22\x0c\x0c\x85\x01"
> lzw = LZWDecoder.new(data)
> puts lzw.run()
> 
> However, with a real stream from PDF file, I cannot get the decompressed
> output. I guess it might be some error in the code or improper handling
> of special character in ruby.

Can you get the python code to decode the real stream? That'd be one way to determine if the original data is corrupt or not.