From: rtilley <rtilley@...>
Date: 2006-03-20T04:33:49+09:00
Subject: Re: safe way to calc md5 on very large files

Erik Veenstra wrote:
>>Why we have no such method in the digest library?
> 
> 
> I extended the MD5 class with a class method to build an MD5
> object directly from the contents of a given file.

Should this be done to sha1, sha2, etc?


> Use it like this:
> 
>  md5 = MD5.file("foo.bar")
> 
> gegroet,
> Erik V. - http://www.erikveen.dds.nl/
> 
> ----------------------------------------------------------------
> 
>  require "md5"
> 
>  class MD5
>    def self.file(file)
>      File.open(file, "rb") do |f|
>        res = self.new
>        while (data = f.read(4096))
>          res << data
>        end
>        res
>      end
>    end
>  end
> 
> ----------------------------------------------------------------
>