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Re: Finding MIME type for a data stream

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On Thursday, 8 March 2012 23:40:13 UTC, Tobiah  wrote:
> > I have to assume you're talking python 2, since in python 3, strings 
> > cannot generally contain image data.  In python 2, characters are pretty 
> > much interchangeable with bytes.
> 
> Yeah, python 2
> 
> 
> > if you're looking for a specific, small list of file formats, you could 
> > make yourself a signature list.  Most (not all) formats distinguish 
> > themselves in the first few bytes. 
> 
> Yeah, maybe I'll just do that.  I'm alowing users to paste
> images into a rich-text editor, so I'm pretty much looking 
> at .png, .gif, or .jpg.  Those should be pretty easy to 
> distinguish by looking at the first few bytes.  
> 
> Pasting images may sound weird, but I'm using a jquery
> widget called cleditor that takes image data from the
> clipboard and replaces it with inline base64 data.  
> The html from the editor ends up as an email, and the
> inline images cause the emails to be tossed in the
> spam folder for most people.  So I'm parsing the
> emails, storing the image data, and replacing the
> inline images with an img tag that points to a 
> web2py app that takes arguments that tell it which 
> image to pull from the database.  
> 
> Now that I think of it, I could use php to detect the
> image type, and store that in the database.  Not quite
> as clean, but that would work.
> 
> Tobiah

Something like the following might be worth a go:
(untested)

from PIL import Image
img = Image.open(StringIO(blob))
print img.format

HTH
Jon.

PIL: http://www.pythonware.com/library/pil/handbook/image.htm

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Thread

Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-08 13:55 -0800
  Re: Finding MIME type for a data stream Dave Angel <d@davea.name> - 2012-03-08 17:11 -0500
    Re: Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-08 14:28 -0800
      Re: Finding MIME type for a data stream Dave Angel <d@davea.name> - 2012-03-08 17:56 -0500
        Re: Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-08 15:40 -0800
          Re: Finding MIME type for a data stream Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-03-08 21:04 -0500
            Re: Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-09 08:40 -0800
          Re: Finding MIME type for a data stream Jon Clements <joncle@googlemail.com> - 2012-03-08 18:31 -0800
            Re: Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-09 09:53 -0800
    Re: Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-08 14:34 -0800
      Re: Finding MIME type for a data stream Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2012-03-09 03:12 +0100
        Re: Finding MIME type for a data stream Tobiah <toby@tobiah.org> - 2012-03-09 08:35 -0800
  Re: Finding MIME type for a data stream Peter Otten <__peter__@web.de> - 2012-03-09 11:50 +0100

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