#30936 [Bgs->Opn]: fread from userspace stream wrapper only reads 8192 bytes
ID: 30936
User updated by: jason at e7x dot com
Reported By: jason at e7x dot com
-Status: Bogus
+Status: Open
Bug Type: Filesystem function related
Operating System: Windows 2000/Linux
PHP Version: 4.3.9
New Comment:
Length bytes have not been read and EOF was not reached, this is not a
network stream.
In the example code there *are* 15000 bytes available to read. Regular
file system functions, compress.zlib (didn't try other builtin streams)
and PHP <= 4.3.8 have no problem reading more than 8192 bytes in one
hit.
I can't find any reference to an 8192 limit anywhere in the manual.
Previous Comments:
------------------------------------------------------------------------
[2004-11-29 23:24:45] derick@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to
report
a bug at http://bugs.php.net/how-to-report.php
http://php.net/fread says:
fread() reads up to length bytes from the file pointer referenced by
handle
note the \"up to\".
------------------------------------------------------------------------
[2004-11-29 22:47:45] jason at e7x dot com
Description:
------------
Attempting to fread() more than 8192 bytes from a userspace stream
wrapper will only read and return the first 8192 bytes, putting an echo
statement in stream_read() shows that it is only being called once.
Reading <= 8192 bytes at a time works as expected, as does fgets($f,
15000) (reads 14999 bytes).
This bug is only present in 4.3.9 and 4.3.10RC1, 4.3.8 works fine.
Reproduce code:
---------------
<?php
// using example class from the manual:
// http://uk.php.net/stream_wrapper_register
$x = str_repeat('x', 15000);
$f = fopen('var://x', 'r');
$len = strlen(fread($f, 15000));
fclose($f);
echo "Read $len bytes";
?>
Expected result:
----------------
Read 15000 bytes
Actual result:
--------------
Read 8192 bytes
------------------------------------------------------------------------
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Thread (7 messages)