Detect HEIC/HEIF format by checking header bytes

CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 1.0.5-wip
 
 * Update video/mp4 mimeType lookup by header bytes.
+* Add image/heic mimeType lookup by header bytes.
+* Add image/heif mimeType lookup by header bytes.
 * Add m4b mimeType lookup by extension.
 * Add `text/markdown` mimeType lookup by extension.
 * Require Dart 3.0.0.

lib/src/magic_number.dart

@@ -309,4 +309,99 @@ const List<MagicNumber> initialMagicNumbers = [
   ]),
 
   MagicNumber('font/woff2', [0x77, 0x4f, 0x46, 0x32]),
+
+  /// High Efficiency Image File Format (ISO/IEC 23008-12).
+  /// -> 4 bytes indicating the ftyp box length.
+  /// -> 4 bytes have the ASCII characters 'f' 't' 'y' 'p'.
+  /// -> 4 bytes have the ASCII characters 'h' 'e' 'i' 'c'.
+  /// https://www.iana.org/assignments/media-types/image/heic
+  MagicNumber('image/heic', [
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x66,
+    0x74,
+    0x79,
+    0x70,
+    0x68,
+    0x65,
+    0x69,
+    0x63
+  ], mask: [
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF
+  ]),
+
+  /// -> 4 bytes indicating the ftyp box length.
+  /// -> 4 bytes have the ASCII characters 'f' 't' 'y' 'p'.
+  /// -> 4 bytes have the ASCII characters 'h' 'e' 'i' 'x'.
+  MagicNumber('image/heic', [
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x66,
+    0x74,
+    0x79,
+    0x70,
+    0x68,
+    0x65,
+    0x69,
+    0x78
+  ], mask: [
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF
+  ]),
+
+  /// -> 4 bytes indicating the ftyp box length.
+  /// -> 4 bytes have the ASCII characters 'f' 't' 'y' 'p'.
+  /// -> 4 bytes have the ASCII characters 'm' 'i' 'f' '1'.
+  MagicNumber('image/heif', [
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x66,
+    0x74,
+    0x79,
+    0x70,
+    0x6D,
+    0x69,
+    0x66,
+    0x31
+  ], mask: [
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF
+  ]),
 ];

test/mime_type_test.dart

@@ -52,6 +52,8 @@ void main() {
       _expectMimeType('file.toml', 'application/toml');
       _expectMimeType('file.md', 'text/markdown');
       _expectMimeType('file.markdown', 'text/markdown');
+      _expectMimeType('file.heif', 'image/heif');
+      _expectMimeType('file.heic', 'image/heic');
     });
 
     test('unknown-mime-type', () {
@@ -233,6 +235,51 @@ void main() {
         0x56,
         0x45
       ]);
+      _expectMimeType('file', 'image/heic', headerBytes: [
+        0x00,
+        0x00,
+        0x00,
+        0x18,
+        0x66,
+        0x74,
+        0x79,
+        0x70,
+        0x68,
+        0x65,
+        0x69,
+        0x63,
+        0x00
+      ]);
+      _expectMimeType('file', 'image/heic', headerBytes: [
+        0x00,
+        0x00,
+        0x00,
+        0x18,
+        0x66,
+        0x74,
+        0x79,
+        0x70,
+        0x68,
+        0x65,
+        0x69,
+        0x78,
+        0x00
+      ]);
+      _expectMimeType('file', 'image/heif', headerBytes: [
+        0x00,
+        0x00,
+        0x00,
+        0x18,
+        0x66,
+        0x74,
+        0x79,
+        0x70,
+        0x6D,
+        0x69,
+        0x66,
+        0x31,
+        0x00
+      ]);
     });
   });