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[REBOL] Re: MD5 Lib and other questions

From: rebol-list2:seznam:cz at: 30-Mar-2004 20:41

Hello Robert, Tuesday, March 30, 2004, 8:29:25 AM, you wrote: RMM> On Sat, 27 Mar 2004 20:18:29 +0100, rebOldes <[rebol-list2--seznam--cz]> wrote:
>> Now just how to count MD5 on file with size like 600MB :(
RMM> Hi, I don't know anything about your use-case but if you use a MD5 to RMM> check for errors or difference, it's normally not necessary to use the RMM> whole file. If you take the first 100KB of each file and make a MD5 the RMM> chances are very high to get a unique MD5. If the files are euqal for a RMM> lot of content, than just pick serveral 100KB slices. Robert MD5 is used to sign files that there were not modified by someone else. If you take a look at some Linux distribution, you can see that there are MD5 checksums of these ISO images (or other files), so you can check if the file is not modified even if you download it from different location (mirror). I don't need this in Rebol (because I have another utility to count MD5 (even on large files), I'm just pointing to a possible problem with Rebol -> using MD5 in Rebol on large file is useless:( -- Best regards, rebOldes -----------------[ ]