zlib problems with Python 2.0

Robert Amesz reqhye72zux at mailexpire.com
Mon Aug 20 02:56:41 CEST 2001

Peter van der Kamp wrote:

> My script does the following.
> Read chunks of text from a text file (I have good reasons not to
> compress the complete file, so I won't explain that here).

Let me guess: you're trying to make a text search machine, right? Don't 
make the chunks too small, though, the compression ratio really suffers 
in that case.

> z = open("d:\\z.dat", "w")

Shouldn't that be "wb"?

> z = open("d:\\z.dat", "r")

And this "rb", perhaps?

That could be the reason tell/seek doesn't work as expected. If that 
doesn't cure is, write a distictive marker (a few bytes) in the file 
before each chunk, and check if it's at the expected position _before_ 
decompressing. You might even want to leave it in the finished code, 
it's a good indicator of file corruption.

HTH, Robert Amesz

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