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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 . 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/ Associated Messages, from the most recent to the oldest:

    
  1. Re: how to determine the actual file format of an image file? (Rob Marquardt 2002)
  2. Re: how to determine the actual file format of an image file?- done (dale's stuff 2002)
  3. Re: how to determine the actual file format of an image file? (dale's stuff 2002)
  4. Re: how to determine the actual file format of an image file? (Jason Tyler 2002)
  5. Re: how to determine the actual file format of an image file? (dale's stuff 2002)
  6. Re: how to determine the actual file format of an image file? (Rob Marquardt 2002)
  7. Re: how to determine the actual file format of an image file? (Glenn Busbin 2002)
  8. Re: how to determine the actual file format of an image file? (Frank Nordberg 2002)
  9. Re: how to determine the actual file format of an image file? (Brian Boegershausen 2002)
  10. Re: how to determine the actual file format of an image file? (Alain Russell 2002)
  11. Re: how to determine the actual file format of an image file? (dale's stuff 2002)
  12. Re: how to determine the actual file format of an image file? (Rob Marquardt 2002)
  13. how to determine the actual file format of an image file? (dale's stuff 2002)
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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