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Topic: Re: LZW decompression in PDF streams
Conf: (P-PDF) Developers, Msg: 57670
From: LeonardR
Date: 5/29/2002 05:27 PM

At 9:59 AM -0400 9/13/00, p-pdf-developer Listmanager wrote:
>I have a weird problem, while decompressing PDF streams, compressed
>with LZW algorithm. In fact everything is fine, until length of
>codes goes from 9 to 10 bits. At this very point algorothm starts
>reading from the stream values that are not yet in the compression
>I wonder if there are any specific things, used by PDF that makes it
>different from classical compression/decompression technics,
>described by Ziv and Lempel?
Nope, PDF uses standard LZW. In fact, you can take the raw
stream from a PDF document and run it through something like Unix
Compress or StuffIt Expander to expand the data. Must be something
wrong in your implementation.

Also, just a reminder that you need to pay Unisys their $$
since they have the patent on LZW.

Leonard Rosenthol
Sr. Software Engineer (215) 922-3509 (voice)
Digital Applications (215) 440-0504 (fax)

PGP Fingerprint: 8CC9 8878 921E C627 0BC1 15BB FC19 64A9 0016 1397

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