MimeAnalyzer: Detect magic bytes for mp3

Unit tests in follow up patch

Bug: T115170
Change-Id: Ie1a63aa319cebbb2efb3cdc478416f5947078cbe

diff --git a/includes/libs/mime/MimeAnalyzer.php b/includes/libs/mime/MimeAnalyzer.php
index 6ea3c21..f4f8bdf 100644 (file)
--- a/includes/libs/mime/MimeAnalyzer.php
+++ b/includes/libs/mime/MimeAnalyzer.php
@@ -529,7 +529,7 @@ EOT;
                        // Formats we recognize magic numbers for
                        'djvu', 'ogx', 'ogg', 'ogv', 'oga', 'spx', 'opus',
                        'mid', 'pdf', 'wmf', 'xcf', 'webm', 'mkv', 'mka',
-                       'webp',
+                       'webp', 'mp3',
 
                        // XML formats we sure hope we recognize reliably
                        'svg',
@@ -670,6 +670,10 @@ EOT;
                        // Multimedia...
                        'MThd'             => 'audio/midi',
                        'OggS'             => 'application/ogg',
+                       'ID3'              => 'audio/mpeg',
+                       "\xff\xfb"         => 'audio/mpeg', // MPEG-1 layer 3
+                       "\xff\xf3"         => 'audio/mpeg', // MPEG-2 layer 3 (lower sample rates)
+                       "\xff\xe3"         => 'audio/mpeg', // MPEG-2.5 layer 3 (very low sample rates)
 
                        // Image formats...
                        // Note that WMF may have a bare header, no magic number.