Bug #79336 [Com]: ext/exif/tests/bug79046.phpt fails on Big endian arch

Edit report at https://bugs.php.net/bug.php?id=79336&edit=1 ID: 79336 Comment by: vibhutisawant18 at gmail dot com Reported by: vibhutisawant18 at gmail dot com Summary: ext/exif/tests/bug79046.phpt fails on Big endian arch Status: Open Type: Bug Package: EXIF related Operating System: Ubuntu 16.04 PHP Version: master-Git-2020-03-03 (Git) Block user comment: N Private report: N New Comment: I added a byte swap in php_ifd_get_float() and php_ifd_get_double(), however same behavior continues to persist. Could you please provide with some more insights. Previous Comments: ------------------------------------------------------------------------ [2020-03-03 10:45:48] nikic@php.net You likely need to introduce a byte-swap into php_ifd_get_float() and php_ifd_get_double() on big-endian architectures. ------------------------------------------------------------------------ [2020-03-03 10:40:51] vibhutisawant18 at gmail dot com Description: ------------ NaN to int cast undefined behavior in exif [ext/exif/tests/bug79046.phpt] Above TC fails on big endian architecture, the expected value for StripOffsets is NAN whereas that returned on Big endian is float(8.9143601808023E-41) Could you please guide us on how to go about it. PFA test case logs on Little and Big endian Architecture. Little Endian: test@a2a9ec71b826:~/php/php-src$ ./sapi/cli/php -f "ext/exif/tests/bug79046.phpt" --TEST-- Bug #79046: NaN to int cast undefined behavior in exif --FILE-- array(8) { ["FileDateTime"]=> int(0) ["FileSize"]=> int(33) ["FileType"]=> int(8) ["MimeType"]=> string(10) "image/tiff" ["SectionsFound"]=> string(24) "ANY_TAG, IFD0, THUMBNAIL" ["COMPUTED"]=> array(2) { ["IsColor"]=> int(0) ["ByteOrderMotorola"]=> int(1) } ["StripOffsets"]=> float(NAN) ["THUMBNAIL"]=> array(1) { ["StripOffsets"]=> float(NAN) } } Big endian: --TEST-- Bug #79046: NaN to int cast undefined behavior in exif --FILE-- array(8) { ["FileDateTime"]=> int(0) ["FileSize"]=> int(33) ["FileType"]=> int(8) ["MimeType"]=> string(10) "image/tiff" ["SectionsFound"]=> string(24) "ANY_TAG, IFD0, THUMBNAIL" ["COMPUTED"]=> array(2) { ["IsColor"]=> int(0) ["ByteOrderMotorola"]=> int(1) } ["StripOffsets"]=> float(8.9143601808023E-41) ["THUMBNAIL"]=> array(1) { ["StripOffsets"]=> float(8.9143601808023E-41) } } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79336&edit=1