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Writing byte stream as jpeg format to disk

Dave Angel davea at ieee.org
Thu Aug 26 16:32:59 EDT 2010 
Navkirat Singh wrote:
> O
> <snip>
> I am using Python3 and I receive a byte stream with a jpeg attached sent by the web browser over a socket, which looks like this:
>
> b': image/jpeg\r\nAccept: text/*\r\nReferer: http://127.0.0.1:8001/\r\nAccept-Language: en-us\r\nAccept-Encoding: gzip, deflate\r\nContent-Length: 91783\r\nConnection: keep-alive\r\n\r\n\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x84\x00\x03\x02\x02\x03\x02\x02\x03\x03\x03\x03\x04\x03\x03\x04\x05\x08\x05\x05\x04\x04\x05\n\x07\x07\x06\x08\x0c\n\x0c\x0c\x0b\n\x0b\x0b\r\x0e\x12\x10\r\x0e\x11\x0e\x0b\x0b\x10\x16\x10\x11\x13\x14\x15\x15\x15\x0c\x0f
>
> From the above, I need to:
>
> a) Split the header content from the image content, which comes after the keep-alive\r\n\r\n part
>
> b) Then write the image content to file for further use as a jpeg.
>
> Nav
>   
An arbitrary string of bytes is not necessarily valid utf-8, so I'm not 
sure why you haven't been getting errors during that "decode."  In any 
case, such a conversion is not reversible.

I would parse that as bytes, perhaps by searching for 'keep-alive'.  
Then split the byte stream into the two parts, and only convert the 
first part to Unicode (Python 3 string).  For safety, you could check to 
make sure the search pattern only appears once, and potentially decode 
it multiple times.  It'll only make sense once.

DaveA
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