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Re: Another bug in lib/content_encoding.c

From: Erik van Pienbroek <admin_at_zapped.2y.net>
Date: Sun, 13 Feb 2005 00:12:49 +0100

Dan Fandrich wrote:

>An "incorrect data check" error is to be expected if the gzip data stream
>
>were truncated so the CRC at the end of the file were missing (at least if
>
>you're using zlib ver. 1.2.x). This corroborates the error code given
>from curl. All the evidence points to a corrupted gzip data stream.
>
>The big change in 7.12.13 was to use zlib's 1.2's built-in gzip header/
>trailer parsing routines instead of the ones in content_encoding.c, when
>available. The latter do not validate the gzip CRC so you won't get such an
>error when using them. You can verify this by using the stock 7.12.13
>(or 7.13.0) sources with zlib 1.4, or by subverting the run-time zlib
>version check in content_encoding.c to simulate an older version of
>zlib.
>
>
Hi Dan,

I've just experimented a bit with the PHP scripts my project calls and found
out the problem isn't in libcurl but in PHP. What happens is the following:
First, the PHP script calls the function | ob_start("ob_gzhandler"); to
enable
gzip'ed output and when the output is finished the function
||while (@ob_end_flush()); is called. These 2 instructions cause PHP to
produce invalid gzip'ed data. If the ob_end_flush() function is left out
the output of the webserver is correct gzip'ed data.

Thanks for your help and sorry to have bothered you
with this false bugreport.
|
Greetings,

Erik van Pienbroek
Received on 2005-02-13

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