From:
Operating system: All
PHP version: 5.3.8
Package: EXIF related
Bug Type: Bug
Bug description:exif_read_file assumes only stdio supports stat(), performs
slow seek to end
Description:
------------
Per Twitter exchange with @pierrejoye
The exif_read_file function checks whether the file is accessed over stdio.
If
it is accessed over stdio, VCWD_STAT() is used to get the size of the file
efficiently. If it is accessed by any other means, this pattern is used:
php_stream_seek(ImageInfo->infile, 0, SEEK_END);
ImageInfo->FileSize = php_stream_tell(ImageInfo-
>infile);
php_stream_seek(ImageInfo->infile, 0, SEEK_SET);
Moving the seek pointer to the end can trigger slow, bandwidth-hungry
network
operations for remote stream wrappers, such as S3 wrappers.
Please test whether the stream implements the stat operation and, if so,
use it
to avoid this performance hit.
I was able to work around the problem by teaching my stream wrapper to
specifically tolerate the "seek to the end / ftell / seek to the start"
pattern
and return cached data.
--
Edit bug report at https://bugs.php.net/bug.php?id=55781&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=55781&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=55781&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=55781&r=trysnapshottrunk
Fixed in SVN:
https://bugs.php.net/fix.php?id=55781&r=fixed
Fixed in SVN and need be documented:
https://bugs.php.net/fix.php?id=55781&r=needdocs
Fixed in release:
https://bugs.php.net/fix.php?id=55781&r=alreadyfixed
Need backtrace:
https://bugs.php.net/fix.php?id=55781&r=needtrace
Need Reproduce Script:
https://bugs.php.net/fix.php?id=55781&r=needscript
Try newer version:
https://bugs.php.net/fix.php?id=55781&r=oldversion
Not developer issue:
https://bugs.php.net/fix.php?id=55781&r=support
Expected behavior:
https://bugs.php.net/fix.php?id=55781&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=55781&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=55781&r=submittedtwice
register_globals:
https://bugs.php.net/fix.php?id=55781&r=globals
PHP 4 support discontinued:
https://bugs.php.net/fix.php?id=55781&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=55781&r=dst
IIS Stability:
https://bugs.php.net/fix.php?id=55781&r=isapi
Install GNU Sed:
https://bugs.php.net/fix.php?id=55781&r=gnused
Floating point limitations:
https://bugs.php.net/fix.php?id=55781&r=float
No Zend Extensions:
https://bugs.php.net/fix.php?id=55781&r=nozend
MySQL Configuration Error:
https://bugs.php.net/fix.php?id=55781&r=mysqlcfg
