MD5 digests of very big files

Richmond richmondmathewson at gmail.com
Sun Jun 27 13:54:21 EDT 2010


On 06/27/2010 08:46 PM, Alejandro Tejada wrote:
> Hi all,
>
> Read this report written by Mark Schonewille:
> http://quality.runrev.com/qacenter/show_bug.cgi?id=2410
>
> Mark Waddingham post this function:
>
> function quasiMD5 pFile
>    local tMD5s
>    open file pFile for binary read
>    repeat
>      read from file pFile for 4096 chars
>      if the result is EOF then
>        exit repeat
>      end if
>      put the md5digest of it after tMD5s
>    end repeat
>    close file pFile
>    return the md5Digest of tMD5s
> end quasiMD5
>
> But when i run this function, Rev
> consumes all memory available.
>
>    
-------------------------------------------------------------

and Mark Waddingham also wrote:

"Some sort of 'stream' abstraction for doing this kind of operation on 
files and
the like would be a useful addition and certainly something to consider 
for a
future version."

in November 2004.

I wonder if anything further has been done in this area over the last 5 
and a half years??????



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