Bug #72561 [NEW]: 5.2.2 regressed with incorrect seeking in stream wrappers

From: nazar at mokrynskyi dot com Operating system: Linux PHP version: 7.1.0alpha1 Package: Filesystem function related Bug Type: Bug Bug description:5.2.2 regressed with incorrect seeking in stream wrappers Description: ------------ When doing reading/seeking on stream wrapper, PHP does interesting magic under the hood (for instance, reading 3 bytes results in 8192 bytes actually tried to be read in ::stream_read()). This is all fine until it works as expected. Here is demo: https://3v4l.org/3RG7r PHP 5.1.4 - 5.2.1 have expected correct output. hhvm-3.9.1 - 3.12.0 seems to also have optimizations under the hood, but result is correct anyway. PHP 5.2.2+ (including latest 7.1.0-alpha2) regressed and does incorrect seeking which results in wrong position eventually. I believe this should be fixed and backported to stable versions, since I do not see any good workaround here, input in ::stream_seek() is already incorrect. -- Edit bug report at https://bugs.php.net/bug.php?id=72561&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72561&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72561&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72561&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72561&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72561&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72561&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72561&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72561&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72561&r=support Expected behavior: https://bugs.php.net/fix.php?id=72561&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72561&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72561&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72561&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72561&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72561&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72561&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72561&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72561&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72561&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72561&r=mysqlcfg