Bug #80590 [Fbk->Csd]: Finfo reports wrong mime type for MP3 files with ID3v1 tags

Edit report at https://bugs.php.net/bug.php?id=80590&edit=1 ID: 80590 User updated by: info at lauta dot media Reported by: info at lauta dot media Summary: Finfo reports wrong mime type for MP3 files with ID3v1 tags -Status: Feedback +Status: Closed Type: Bug Package: *Directory/Filesystem functions Operating System: Ubuntu 20.04.1 LTS PHP Version: 8.0.0 Assigned To: cmb Block user comment: N Private report: N New Comment: Confirmed that the same also happens with file 5.39, so it is an upstream bug then. Closing the issue. Previous Comments: ------------------------------------------------------------------------ [2021-01-05 15:17:27] cmb@php.net If file 5.39 reports the same MIME types, this would indeed be an upstream issue. In this case, please report it there. Otherwise, please provide the sample file for download from the Web. ------------------------------------------------------------------------ [2021-01-05 10:50:26] info at lauta dot media Description: ------------ mime_content_type() and finfo reports mime type application/octet-stream for MP3 files with ID3v1 tags. ID3v1 seems to be used in up to 10% of all MP3 files which have any ID3 tags. This seems to be an issue with PHP built in magic.mime. Using a custom magicfile with finfo with just the below contents reports the mime type for those files correctly. For the avoidance of doubt file -i also reports the wrong mime type unless I add the rows below to /etc/magic, so this might actually be an upstream bug. id3v1.mp3: application/octet-stream; charset=binary # for the test script the following is the file 'mp3id3v1_magic.mime'. 0 string ID3 audio/mpeg !:mime audio/mpeg Test script: --------------- <?php echo mime_content_type('id3v1.mp3') . "\n"; $finfo = new finfo(FILEINFO_MIME_TYPE); echo $finfo->file($filePath) . "\n"; $finfo = new finfo(FILEINFO_MIME_TYPE, 'mp3id3v1_magic.mime'); echo $finfo->file($filePath) . "\n"; Expected result: ---------------- audio/mpeg audio/mpeg audio/mpeg Actual result: -------------- application/octet-stream application/octet-stream audio/mpeg ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80590&edit=1