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December 1996

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1996.12.02 17:38 "lzw bug?", by Mic Campanelli

1996.12.02 19:18 "Re: lzw bug?", by Sam Leffler

1996.12.02 19:18 "Re: lzw bug?", by Sam Leffler

    To:  tiff@sgi.com
    Subject:  lzw bug?
    Date: Mon, 02 Dec 1996 09:38:11 PST
    From:  Campanel <campanel@wrc.xerox.com>

    Sam,
    
       We, as I am sure with many others, have been using the TIFF library
    for years.  A while ago, I installed ver3.4beta035, compiled it on a
    SPARC20 running Solaris 2.4 with SUNPRO C4.0 compiler.  For the most
    part everything works. The image always comes through. But for every
    line that is read I get the message:
    
     LZWDecode: Bogus encoding, loop in the code table; scanline xxx
         .
         .
         .
    
    
    If I write the file with rowsperstrip equal to 1, no problem.  Anything
    else is a problem.  I have tried it on SunOS and get the same thing. 
    Rather that use my api's into the library I used the tiffcp utility and
    get the same problem.  Any idea why?
    
The above message means there is a loop in the LZW-encoded data; this
should not happen (especially if the data is generated by my library).
I've only ever seen this problem on corrupted date and some images
generated by a certain PC-based app.  Without a way to reproduce your
problem there's not much otherwise that I can say.

        Sam