Restricting upload file size (without uploading it first!!)

Question

The following code works in restricting the filesize, however it takes proportionately more time to tell you for bigger files. So does that mean its uploading it temporarily, reading it, finding out its too big, then deleting it? That would be completely backwards. Is there any way to check the filesize quickly? Because if someone tries to upload a 10mb file it will take an hour to tell them its too big!!
<cfif cgi.content_length GTE fileSizeLimit>
<cfoutput>
Your preset file is too big!
The maximum size allowed is #fileSizeLimit#
</cfoutput>
<cfabort>
<cfelse>
         <!--- Begin processing first file submission --->
    <cfif IsDefined('form.requiredfile_one') AND Trim(form.requiredfile_one) neq "">
        <cffile
            action="upload"
            destination="#dstfile#"
            filefield="requiredfile_one"
            nameconflict="makeunique">
            <cfset cookie.requiredfile_one = "#cffile.serverfile#">
            <cfset cookie.requiredfile_one_ext = "#cffile.serverfileext#">
        <cfquery name="rs_insert_1" datasource="062409js06ag">
            Insert Into presets
                (pfilename, pfilenameext, artistid, artistname, presetname, presetgenre, bpm, soundslike, daws, vsts, license, instructions)
                Values
                (<cfqueryparam value="#cookie.requiredfile_one#" cfsqltype="cf_sql_varchar">
                , <cfqueryparam value="#cookie.requiredfile_one_ext#" cfsqltype="cf_sql_varchar">,         #findname.ID#, '#findname.uname#', '#requiredname#', '#requiredgenre#', '#bpm#', '#soundslike#', '#requireddaw#', '#requiredvst#', '#requiredlicense#', '#requiredinstructions#')    
        </cfquery>      
        <cfquery name="qNewContact" datasource="062409js06ag">
        SELECT @@IDENTITY AS NEW_ID
        </cfquery>
        <cfset newContactID = qNewContact.NEW_ID />
    </cfif>
</cfif>

Answer 1

You might try using Flex on the client.  I have not tried this technique, but *perhaps* the Flex API allows more access to the file system than JavaScript.  Note that the FileReference class used in Flex file samples has a "size" property that *might* give you the size of the file on the client.
Note that this approach depends on the client using Flash Player and executing client-side code.
References:
Working with file upload and download
http://livedocs.adobe.com/flex/3/html/help.html?content=17_Networking_and_communications_7 .html
FileReference class
http://livedocs.adobe.com/flex/3/langref/flash/net/FileReference.html