fix: avoid processing MOV (quicktime) files when BMFF is enabled

(cherry picked from commit 1b6895927f293855e5bb437ad28f31da2c2cfe54)

src/bmffimage.cpp

@@ -637,8 +637,16 @@ namespace Exiv2
             return false;
         }
 
-        bool matched = (buf[4] == 'f' && buf[5] == 't' && buf[6] == 'y' && buf[7] == 'p')
+        // bmff should start with "ftyp"
-                     ||(buf[4] == 'J' && buf[5] == 'X' && buf[6] == 'L' && buf[7] == ' ');
+        bool const is_ftyp = (buf[4] == 'f' && buf[5] == 't' && buf[6] == 'y' && buf[7] == 'p');
+        // jxl files have a special start indicator of "JXL "
+        bool const is_jxl = (buf[4] == 'J' && buf[5] == 'X' && buf[6] == 'L' && buf[7] == ' ');
+
+        // MOV(quicktime) files seem to also start with ftyp, but we don't want to process them
+        // so check that we don't encounter "qt  "
+        // FIXME what others types can we abort early here?
+        bool const is_video = (buf[8] == 'q' && buf[9] == 't' && buf[10] == ' ' && buf[11] == ' ');
+        bool matched = is_jxl || (is_ftyp && !is_video);
         if (!advance || !matched) {
             iIo.seek(static_cast<long>(0), BasicIo::beg);
         }
@@ -654,4 +662,3 @@ namespace Exiv2
     }
 }
 #endif
-