PHP Stream wrappers seek with whence SEEK_CUR doesn't work

16 years ago by Davide Romanini — view source — reply

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Hi,

I'm developing a custom stream wrapper and I've found this bug
implementing the stream_seek() method.

My php version:
PHP 5.2.8 (cli) (built: Dec 17 2008 00:54:27)
Copyright (c) 1997-2008 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies
with Zend Extension Manager v1.0.11, Copyright (c) 2003-2006, by
Zend Technologies
with Zend Optimizer v3.2.0, Copyright (c) 1998-2006, by Zend
Technologies
with Zend Debugger v5.2.2, Copyright (c) 1999-2006, by Zend Technologies

I've attached a simple script to reproduce the bug. It's a modified
version of the example stream wrapper at
http://www.php.net/manual/en/stream.streamwrapper.example-1.php.

Expected result should be:
whence=0
whence=1
whence=0
line1
line2
line3

but it is:
whence=0
whence=0
whence=0
line1
line2
line3

It seems that the SEEK_CUR parameter is always ignored and the whence
value passed to my wrapper is SEEK_SET.

Using SEEK_END works as expected.

Regards,
Davide Romanini

16 years ago by johannes@schlueters.de — view source — reply

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Hi,

My php version:
PHP 5.2.8 (cli) (built: Dec 17 2008 00:54:27)

Please use a recent version of PHP.

Copyright (c) 1997-2008 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies
with Zend Extension Manager v1.0.11, Copyright (c) 2003-2006, by
Zend Technologies
with Zend Optimizer v3.2.0, Copyright (c) 1998-2006, by Zend
Technologies
with Zend Debugger v5.2.2, Copyright (c) 1999-2006, by Zend Technologies

Please disable third party modules before reporting any issues to us.

I've attached a simple script to reproduce the bug. It's a modified
version of the example stream wrapper at
http://www.php.net/manual/en/stream.streamwrapper.example-1.php.
[...]
It seems that the SEEK_CUR parameter is always ignored and the whence
value passed to my wrapper is SEEK_SET.

I think (didn't verify) that PHP keeps track of the position and
rewrites CUR to SET accordingly, but as said: Didn't verify.

johannes

16 years ago by Davide Romanini — view source — reply

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Il Wed, 04 Nov 2009 12:11:40 +0100, Johannes Schlüter ha scritto:

Hi,

My php version:
PHP 5.2.8 (cli) (built: Dec 17 2008 00:54:27)

Please use a recent version of PHP.

Copyright (c) 1997-2008 The PHP Group Zend Engine v2.2.0, Copyright (c)
1998-2008 Zend Technologies
with Zend Extension Manager v1.0.11, Copyright (c) 2003-2006, by
Zend Technologies
with Zend Optimizer v3.2.0, Copyright (c) 1998-2006, by Zend
Technologies
with Zend Debugger v5.2.2, Copyright (c) 1999-2006, by Zend
Technologies

Please disable third party modules before reporting any issues to us.

I'll take time to try the script on php 5.2.11. I tried also on php 5.2.6
without zend extensions without success. If someone on the list could try
it on a php 5.2.11 sandbox it is very welcome :-)

I've attached a simple script to reproduce the bug. It's a modified
version of the example stream wrapper at
http://www.php.net/manual/en/stream.streamwrapper.example-1.php.
[...]
It seems that the SEEK_CUR parameter is always ignored and the whence
value passed to my wrapper is SEEK_SET.

I think (didn't verify) that PHP keeps track of the position and
rewrites CUR to SET accordingly, but as said: Didn't verify.

Well, and why the hell php should do that?? It is a bug to me.

Regards,
Davide Romanini