Bug #71417 [Ver->Csd]: fread() does not report zlib.inflate errors

Edit report at https://bugs.php.net/bug.php?id=71417&edit=1 ID: 71417 Updated by: cmb@php.net Reported by: salsi at icosaedro dot it Summary: fread() does not report zlib.inflate errors -Status: Verified +Status: Closed Type: Bug Package: Streams related Operating System: Slackware 14.1 PHP Version: master-Git-2016-01-20 (Git) Assigned To: cmb Block user comment: N Private report: N New Comment: Automatic comment on behalf of cmbecker69@gmx.de Revision: http://git.php.net/?p=php-src.git;a=commit;h=3d1b730c11a4e37884d25bf8af0d5726834986c4 Log: Fix #71417: fread() does not report zlib.inflate errors Previous Comments: ------------------------------------------------------------------------ [2020-04-17 14:22:41] cmb@php.net The following pull request has been associated: Patch Name: Fix #71417: fread() does not report zlib.inflate errors On GitHub: https://github.com/php/php-src/pull/5408 Patch: https://github.com/php/php-src/pull/5408.patch ------------------------------------------------------------------------ [2020-04-17 13:39:43] cmb@php.net Related To: Bug #71263 ------------------------------------------------------------------------ [2017-12-09 11:02:03] salsi at icosaedro dot it Probably related to bug #71384 -- see for the general discussion about missing error propagation in the streams layer. ------------------------------------------------------------------------ [2016-01-21 00:35:22] salsi at icosaedro dot it Related To: Bug #68556 ------------------------------------------------------------------------ [2016-01-20 11:06:39] salsi at icosaedro dot it ...and in general errors that are certainly generated internally to the zlib library are not reported to the user's application, resulting in missing or no data read at all. This happens, for example, when an highly compressible stream (say, a source program at least 40 KB long) that was compressed with a large window (window=15+16), is then decompressed with a smaller window (window=9+16). In this case fread() simply returns the empty string before the feof() (source code available). At this point these issues seem more related to the general implementation of the stream filters that to a specific filter, but I don't know enough of the internals stuff to tell for sure. FIX: in the test script above any reference to "bzip2" in the comments should be read "zlib" :-> ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=71417 -- Edit this bug report at https://bugs.php.net/bug.php?id=71417&edit=1