Added support for lz4.

README.rst

@@ -132,6 +132,7 @@ Archive
 -  **ar** - ``application/x-unix-archive``
 -  **Z** - ``application/x-compress``
 -  **lz** - ``application/x-lzip``
+-  **lz4** - ``application/x-lz4``
 
 Font
 ^^^^

filetype/types/__init__.py

@@ -85,6 +85,7 @@
     archive.Ar(),
     archive.Z(),
     archive.Lz(),
+    archive.Lz4(),
 )
 
 # Supported archive container types

filetype/types/archive.py

@@ -515,6 +515,27 @@ def match(self, buf):
                 buf[3] == 0x50)
 
 
+class Lz4(Type):
+    """
+    Implements the Lz4 archive type matcher.
+    """
+    MIME = 'application/x-lz4'
+    EXTENSION = 'lz4'
+
+    def __init__(self):
+        super(Lz4, self).__init__(
+            mime=Lz4.MIME,
+            extension=Lz4.EXTENSION
+        )
+
+    def match(self, buf):
+        return (len(buf) > 3 and
+                buf[0] == 0x04 and
+                buf[1] == 0x22 and
+                buf[2] == 0x4D and
+                buf[3] == 0x18)
+
+
 class Br(Type):
     """Implements the Br image type matcher."""
 
@@ -561,4 +582,3 @@ def __init__(self):
 
     def match(self, buf):
         return buf[:4] == bytearray([0xed, 0xab, 0xee, 0xdb])
-