Macs do determine MIME type based on information in the resource fork. BeOS does something very similar. Most Unix systems actually inspect the file for a magic number to determine type.
Matt Liotta President & CEO Montara Software, Inc. http://www.montarasoftware.com/ 888-408-0900 x901 > -----Original Message----- > From: S. Isaac Dealey [mailto:[EMAIL PROTECTED]] > Sent: Monday, January 06, 2003 5:33 PM > To: CF-Talk > Subject: RE: CFFILE > > Thanks for the clarification Mosh, > > Now that you mention it, I have a vague memory of someone I knew > mentioning > the resource fork in Mac OS before. > > > S. Isaac Dealey wrote: > >> I'm not especially knowledgeable about mime either, but > >> my impression ( > > and > >> I could be entirely wrong ) is that the MIME type is > >> derived from the > >> extension, so if I'm right, you wouldn't really be > >> gaining anything by > >> referencing MIME info because if they rename the file > >> extension that info > >> will change. I'd have to test the theory to know if I'm > >> right, but that's > > my > >> thinking off the top of my head. :) > > > Just to clarify this bit, the Mime-Type is sent by the > > client/browser but > > how the client determines the correct type is browser/OS > > dependant. All > > Windows browsers that I know of use the OS to determine > > the Mime-Type, which > > uses file extensions. > > > However, this is not necessarily the case for other OSes. > > Macs, for > > example, store file information in a resource fork, > > separate from the file > > data and the filename. (Note, I'm not a Mac expert by any > > stretch of the > > imagination.) The file's type, I believe, is stored in > > the resource fork > > and is not dependant on the filename. So, technically, a > > Mac client could > > send a file named a.gif with a Mime-Type of "Image/JPEG" > > if the resource > > fork indicated that the file was really a JPEG. Whether > > or not this > > happens, I don't know. > > >> Yea, I think someone mentioned an cgi variable... > >> http_content_length > > iirc, > >> which indicates file size in a real roundabout fashion -- > >> it's inclusive > > of > >> any form field content, like textareas, etc. also iirc... > >> so, the theory > >> being that if you check that variable and it says 50000 > >> then you know that > > a > >> little less than 50k was transmitted... Now that you > >> mention it, although > > no > >> file is placed on the server until after the <cffile> > >> call, cancelling out > >> before that point might not save the user any time > >> either, since I'm not > >> sure if this variable is passed to the server by the > >> browser, or if the > >> calculation is performed by the server after all the data > >> is sent. Again, > > I > >> haven't tested it, so I'm not sure. :) > > > The content length of a request is sent in the HTTP > > headers so, technically, > > you could check the header info before the data was > > actually passed along. > > However, this would require a much finer level of control > > over the web > > server's processes than CF currently allows. > > > -- > > Mosh Teitelbaum > > evoch, LLC > > Tel: (301) 625-9191 > > Fax: (301) 933-3651 > > Email: [EMAIL PROTECTED] > > WWW: http://www.evoch.com/ > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > ~~~~~~~~~~~| > > Archives: > > http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 > > Subscription: http://www.houseoffusion.com/cf_lists/index. > > cfm?method=subscribe&forumid=4 > > FAQ: http://www.thenetprofits.co.uk/coldfusion/faq > > This list and all House of Fusion resources hosted by > > CFHosting.com. The place for dependable ColdFusion > > Hosting. > > > Unsubscribe: > http://www.houseoffusion.com/cf_lists/uns > > ubscribe.cfm?user=633.558.4 > > > s. isaac dealey 954-776-0046 > > new epoch http://www.turnkey.to > > lead architect, tapestry cms http://products.turnkey.to > > certified advanced coldfusion 5 developer > http://www.macromedia.com/v1/handlers/index.cfm?ID=21816 > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/cf_lists/index.cfm?method=subscribe&forumid=4 FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
