Re: how to determine the actual file format of an image file?
This WebDNA talk-list message is from 2002
It keeps the original formatting.
numero = 44639
interpreted = N
texte = on 10/30/02 4:33 PM, Rob Marquardt at rob@toastdesign.com so noted...> One possibility to get around that limitation would be to encrypt the file > as base64 and check for the appropriate encoded text. > > [showif [getchars start=1&end=4][encrypt > method=base64&file=mysteryFile.zzz][/encrypt][/getchars]=R0lG] > We have a GIF! > [/showif] > > [showif [getchars start=1&end=17][encrypt > method=base64&file=mysteryFile.zzz][/encrypt][/getchars]^SkZJRg] > We have a JPEG! > [/showif] > > R0lG and SkZJRg being the base64 encodings of GIF and JFIF > respectively. > > Not extensively tested, but perhaps a place to start.As a follow-up, this correctly identified any image file I threw at it. Rob Marquardt Designer/Resident Wirehead Toast Design800 Washington Avenue North Minneapolis MN 55401 612.330.9863 v 612.321.9424 f www.toastdesign.com ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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on 10/30/02 4:33 PM, Rob Marquardt at rob@toastdesign.com so noted...> One possibility to get around that limitation would be to encrypt the file > as base64 and check for the appropriate encoded text. > > [showif [getchars start=1&end=4][encrypt > method=base64&file=mysteryFile.zzz][/encrypt][/getchars]=R0lG] > We have a GIF! > [/showif] > > [showif [getchars start=1&end=17][encrypt > method=base64&file=mysteryFile.zzz][/encrypt][/getchars]^SkZJRg] > We have a JPEG! > [/showif] > > R0lG and SkZJRg being the base64 encodings of GIF and JFIF > respectively. > > Not extensively tested, but perhaps a place to start.As a follow-up, this correctly identified any image file I threw at it. Rob Marquardt Designer/Resident Wirehead Toast Design800 Washington Avenue North Minneapolis MN 55401 612.330.9863 v 612.321.9424 f www.toastdesign.com ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://search.smithmicro.com/
Rob Marquardt
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