From: [EMAIL PROTECTED]
Operating system: kubuntu linux
PHP version: 5.2.0
PHP Bug Type: Streams related
Bug description: stream_copy_to_stream() with filters truncates output
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)
--
Edit bug report at http://bugs.php.net/?id=40188&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40188&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40188&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40188&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40188&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40188&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40188&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40188&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40188&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40188&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40188&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40188&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40188&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40188&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40188&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40188&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40188&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40188&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40188&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40188&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40188&r=mysqlcfg
