Move SafeUnbuffered to own Python file

DeDRM_plugin/ignoblekeyNookStudy.py

@@ -27,35 +27,12 @@ import hashlib
 import getopt
 import re
 
-# Wrap a stream so that output gets flushed immediately
-# and also make sure that any unicode strings get
-# encoded using "replace" before writing them.
-class SafeUnbuffered:
-    def __init__(self, stream):
-        self.stream = stream
-        self.encoding = stream.encoding
-        if self.encoding == None:
-            self.encoding = "utf-8"
-    def write(self, data):
-        if isinstance(data,str) or isinstance(data,unicode):
-            # str for Python3, unicode for Python2
-            data = data.encode(self.encoding,"replace")
-        try:
-            buffer = getattr(self.stream, 'buffer', self.stream)
-            # self.stream.buffer for Python3, self.stream for Python2
-            buffer.write(data)
-            buffer.flush()
-        except:
-            # We can do nothing if a write fails
-            raise
-    def __getattr__(self, attr):
-        return getattr(self.stream, attr)
+from utilities import SafeUnbuffered
 
 try:
-    from calibre.constants import iswindows, isosx
+    from calibre.constants import iswindows
 except:
     iswindows = sys.platform.startswith('win')
-    isosx = sys.platform.startswith('darwin')
 
 def unicode_argv():
     if iswindows: