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  1. #1
    Join Date
    Sep 2006
    Posts
    19

    Grin Patch Powerpoints?

    Hey everyone,

    I have a program that I built with Auto Play that has several Powerpoints presentations in it that are over 200MB each. Is there anyway to patch the "difference" between the Powerpoints, rather than having it replace the whole file? Here's an example:

    Powerpoint #1 is 100MB
    Powerpoint #1a is 105MB

    If I create a "patch", the patch is 105 MB because it is replacing the previous version of the presentation. Is there any way for the software to create a true difference patch?

    Thanks,

    Brian

  2. #2
    Join Date
    Oct 2003
    Posts
    914
    Take a look at Visual Patch 3.0. It can make true binary differences.

    http://www.indigorose.com/visual-patch/

  3. #3
    Join Date
    Nov 2001
    Posts
    498
    Take a look at Visual Patch 3.0.
    VP2 wouldn't do this....?

  4. #4
    Join Date
    Jul 2001
    Location
    Sunshine Coast, Queensland, Australia
    Posts
    139
    The problem is not so much with visual patch but in the file format that power point uses.

    If you create a basic presentation with a single page, save that, then add a trivial change and save as another name. Comparing these two files will show significant differences.

    Given larger changes it is no wonder that a differencing/patching engine would trouble with these files.

    However if you find (command line) patching tools that handle this case better then you can use those invisibly behind the scenes and as suggested give VP3 a go. If it make all the difference it would be worth the upgrade yes?

  5. #5
    Join Date
    Feb 2001
    Location
    Indigo Rose Software
    Posts
    2,729
    (He didn't specify whether he was making a patch with VP2 or just a whole-file "patch" with autoplay.)

    There were a couple improvements to the DeltaMAX patching engine between VP 2 and 3 that can result in smaller differences for some files, but nothing specifically targeted at powerpoint files.

    If powerpoint files use compression, that can make them bad candidates for binary differencing, since the compression has the effect of hiding all the similarities between the files. You might be able to turn the compression off in powerpoint and see if that makes a difference.
    --[[ Indigo Rose Software Developer ]]

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