Handle heix (iOS 18)

Author: robbassi

src/matchers/image.rs

@@ -107,7 +107,7 @@ pub fn is_heif(buf: &[u8]) -> bool {
     }
 
     if let Some((major, _minor, compatible)) = get_ftyp(buf) {
-        if major == b"heic" {
+        if major == b"heic" || major == b"heix" {
             return true;
         }
 

testdata/sample2.heic

@@ -24,6 +24,8 @@ test_format!(Image, "image/vnd.microsoft.icon", "ico", ico, "sample.ico");
 
 test_format!(Image, "image/heif", "heif", heif, "sample.heic");
 
+test_format!(Image, "image/heif", "heif", heif2, "sample2.heic");
+
 test_format!(Image, "image/avif", "avif", avif, "sample.avif");
 
 test_format!(Image, "image/jxl", "jxl", jxl, "spline_on_first_frame.jxl");