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Number   :  4210
Date     :  2003-04-05
Author   :  rotaiv
Subject  :  Re: Delta-Byte Replication
Size(KB) :  0


Just wanted to add another note here. By default, xdelta creates an 
md5 check sum of the original file. When the second file is patched, 
xdelta checks the md5 hash of the output file to determine if it 
matches the original file. Therefore, xdelta will know itself if it 
failed or not. Naturally, if you are still concerned, you can verify 
the md5 independent of xdelta to make sure everything is working OK. 
There are win32 versions of md5 available if you need one. Also, if 
you use 'xdelta info patch.bin' it will show the details (including the 
md5 hash) of the patch file.

rotaiv.

>> One advantage of this approach is that a bug in the xdelta program
> would not cause you to have an incorrect copy of the file on the
> other end of the WAN link (assuming that the "apply xdelta" program
> behaves identically on both systems).



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