Sending binary data over CGI

Walter Huf hufman at cobalty.com
Thu Mar 4 04:04:27 CET 2004


Okay, I'm busy making a wonderful cgi program, and everything is working 
wonderfully so far. I'm using the standard cgi library and the Cookie 
library and they have been a huge help. Thanks to those who have created 
them!
However, if I try to send binary data, like jpgs, through cgi, the data 
gets corrupted in a very small manner. Whenever my program sends the 
character 10, it gets converted to character 13+character 10. I found out 
this only happens when I send data to stdout. If I send the data to a 
standard file object, it works fine. However, with the stdout, the problem 
arises.
Here is the relevant part of the code:
---Begin
from sys import stdout
def senddownloaddata(file):    	#file is a pointer to an open file
    line=file.read(1)    	    	#file pointer opening and closing are
    while len(line)==1:    	    	# handled outside of function
        stdout.write(line)
        line=file.read(1)
    stdout.write(line)
---End
Now the code that copies files:
---Begin
curdir="C:\windows\desktop"
temp=file(curdir+"/bach.it","rb",0)
out=file(curdir+"/bach2.it","wb",0)
data=temp.read(1)
while len(data)==1:
    out.write(data)
    data=temp.read(1)
temp.close()
out.close()
---End

I'm using Windows 98 SE with an Apache 2.0.44 Win32 server. That all works 
fine. The first line of the interactive script says:
PythonWin 2.3.2 (#49, Nov 13 2003, 10:34:54) [MSC v.1200 32 bit (Intel)] on 
win32.
I'm assuming that means I have Python 2.3.2. Everything else in the program 
works very nice, except for the data corruption.

Please help me with this problem. It has me stumped.
Thanks in advance!

--Walter Huf--
hufman at cobalty.com


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