feat: support JPEG XL

Author: scientificworld

README.rst

@@ -66,6 +66,7 @@ Image
 -  **xcf** - ``image/x-xcf``
 -  **jpg** - ``image/jpeg``
 -  **jpx** - ``image/jpx``
+-  **jxl** - ``image/jxl``
 -  **png** - ``image/png``
 -  **apng** - ``image/apng``
 -  **gif** - ``image/gif``
@@ -161,7 +162,7 @@ Font
 -  **otf** - ``application/font-sfnt``
 
 Application
-^^^^^^^^^^^ 
+^^^^^^^^^^^
 
 -  **wasm** - ``application/wasm``
 

filetype/types/__init__.py

@@ -17,6 +17,7 @@
     image.Xcf(),
     image.Jpeg(),
     image.Jpx(),
+    image.Jxl(),
     image.Apng(),
     image.Png(),
     image.Gif(),

filetype/types/image.py

@@ -48,6 +48,38 @@ def match(self, buf):
         )
 
 
+class Jxl(Type):
+    """
+    Implements the JPEG XL image type matcher.
+    """
+
+    MIME = "image/jxl"
+    EXTENSION = "jxl"
+
+    def __init__(self):
+        super(Jxl, self).__init__(mime=Jxl.MIME, extension=Jxl.EXTENSION)
+
+    def match(self, buf):
+        return (
+            (len(buf) > 1 and
+             buf[0] == 0xFF and
+             buf[1] == 0x0A) or
+            (len(buf) > 11 and
+             buf[0] == 0x00 and
+             buf[1] == 0x00 and
+             buf[2] == 0x00 and
+             buf[3] == 0x00 and
+             buf[4] == 0x0C and
+             buf[5] == 0x4A and
+             buf[6] == 0x58 and
+             buf[7] == 0x4C and
+             buf[8] == 0x20 and
+             buf[9] == 0x0D and
+             buf[10] == 0x87 and
+             buf[11] == 0x0A)
+        )
+
+
 class Apng(Type):
     """
     Implements the APNG image type matcher.

tests/fixtures/sample.jxl

@@ -32,6 +32,12 @@ def test_guess_jpx(self):
         self.assertEqual(kind.mime, 'image/jpx')
         self.assertEqual(kind.extension, 'jpx')
 
+    def test_guess_jxl(self):
+        kind = filetype.guess(FIXTURES + '/sample.jxl')
+        self.assertTrue(kind is not None)
+        self.assertEqual(kind.mime, 'image/jxl')
+        self.assertEqual(kind.extension, 'jxl')
+
     def test_guess_gif(self):
         kind = filetype.guess(FIXTURES + '/sample.gif')
         self.assertTrue(kind is not None)
@@ -56,7 +62,6 @@ def test_guess_m4a(self):
         self.assertEqual(kind.mime, 'audio/mp4')
         self.assertEqual(kind.extension, 'm4a')
 
-
     def test_guess_mp4(self):
         kind = filetype.guess(FIXTURES + '/sample.mp4')
         self.assertTrue(kind is not None)