Simplified utils.text.StreamingBuffer.

django/utils/text.py

@@ -280,26 +280,13 @@ def compress_string(s):
     return zbuf.getvalue()
 
 
-class StreamingBuffer:
+class StreamingBuffer(BytesIO):
-    def __init__(self):
-        self.vals = []
-
-    def write(self, val):
-        self.vals.append(val)
-
     def read(self):
-        if not self.vals:
+        ret = self.getvalue()
-            return b''
+        self.seek(0)
-        ret = b''.join(self.vals)
+        self.truncate()
-        self.vals = []
         return ret
 
-    def flush(self):
-        return
-
-    def close(self):
-        return
-
 
 # Like compress_string, but for iterators of strings.
 def compress_sequence(sequence):