[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 -----------------[ http://oldes.multimedia.cz/ ]
