#40188 [Asn->Fbk]: stream_copy_to_stream() with filters truncates output
ID: 40188
Updated by: jani@php.net
Reported By: cellog@php.net
-Status: Assigned
+Status: Feedback
Bug Type: Streams related
Operating System: kubuntu linux
PHP Version: 5.2.0
Assigned To: pollita
New Comment:
Please try using this CVS snapshot:
http://snaps.php.net/php5.2-latest.tar.gz
For Windows (zip):
http://snaps.php.net/win32/php5.2-win32-latest.zip
For Windows (installer):
http://snaps.php.net/win32/php5.2-win32-installer-latest.msi
Previous Comments:
------------------------------------------------------------------------
[2007-01-22 07:17:10] tony2001@php.net
Sara, could you look into this?
------------------------------------------------------------------------
[2007-01-21 22:07:56] cellog@php.net
Description:
------------
This was detected in the phar extension, but can be reproduced with
regular php code.
Because _php_stream_read in main/streams/streams.c automatically
truncates output from a streams filter to the maximum requested amount,
this does not allow the possibility of specifying pre-filter amount of
bytes to read.
"new b" is 5 bytes, but zlib deflates it to a 7-byte length. Because
writepos is > toread, it is cut to 5 bytes.
A new flag is needed to specify that we want to read a maximum bytes,
not write a maximum bytes.
Although I put "int(7)" in the expected output, I don't expect this
output unless a flag is passed that specifically asks to do this.
Reproduce code:
---------------
<?php
file_put_contents('test1.txt', 'new b/next thing');
$a = fopen('test1.txt', 'rb');
$newa = fopen('test2.txt', 'wb');
stream_filter_append($a, 'zlib.deflate');
$b = stream_copy_to_stream($a, $newa, 5);
var_dump($b, ftell($newa));
Expected result:
----------------
int(5)
int(7)
Actual result:
--------------
int(5)
int(5)
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=40188&edit=1
Thread (3 messages)