Add magic numbers for WebP

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 1.1.0
+
+* Add image/webp mimeType lookup by header bytes.
+
 # 1.0.0
 
 * Stable null safety release.

lib/src/magic_number.dart

@@ -65,4 +65,37 @@ const List<MagicNumber> initialMagicNumbers = [
     0xFF
   ]),
   MagicNumber('model/gltf-binary', [0x46, 0x54, 0x6C, 0x67]),
+
+  /// The WebP file format is based on the RIFF document format.
+  /// -> 4 bytes have the ASCII characters 'R' 'I' 'F' 'F'.
+  /// -> 4 bytes indicating the size of the file
+  /// -> 4 bytes have the ASCII characters 'W' 'E' 'B' 'P'.
+  /// https://developers.google.com/speed/webp/docs/riff_container
+  MagicNumber('image/webp', [
+    0x52,
+    0x49,
+    0x46,
+    0x46,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x57,
+    0x45,
+    0x42,
+    0x50
+  ], mask: [
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0xFF,
+    0xFF,
+    0xFF,
+    0xFF
+  ])
 ];

pubspec.yaml

@@ -1,5 +1,5 @@
 name: mime
-version: 1.0.0
+version: 1.1.0
 
 description: >-
   Utilities for handling media (MIME) types, including determining a type from

test/mime_type_test.dart

@@ -40,6 +40,7 @@ void main() {
       _expectMimeType('file.pdf', 'application/pdf');
       _expectMimeType('file.tiff', 'image/tiff');
       _expectMimeType('file.tif', 'image/tiff');
+      _expectMimeType('file.webp', 'image/webp');
     });
 
     test('unknown-mime-type', () {
@@ -87,6 +88,20 @@ void main() {
         0x70,
         0x35
       ]);
+      _expectMimeType('file', 'image/webp', headerBytes: [
+        0x52,
+        0x49,
+        0x46,
+        0x46,
+        0xE2,
+        0x4A,
+        0x01,
+        0x00,
+        0x57,
+        0x45,
+        0x42,
+        0x50
+      ]);
     });
   });