--- C:/Users/BRMA/AppData/Local/Temp/abstract.py-revBASE.svn004.tmp.py	Thu Mar 15 13:18:28 2012
+++ E:/Workspace/svn/Twisted-5562/twisted/internet/iocpreactor/abstract.py	Tue Jan 15 12:37:35 2013
@@ -146,12 +146,12 @@
 
     # write stuff
     dataBuffer = ''
-    offset = 0
     writing = False
     _writeScheduled = None
     _writeDisconnecting = False
     _writeDisconnected = False
     writeBufferSize = 2**2**2**2
+    writePending = False
 
 
     def loseWriteConnection(self):
@@ -168,28 +168,26 @@
         # in current code should never be called
         self.connectionLost(reason)
 
-
     def startWriting(self):
         self.reactor.addActiveHandle(self)
         self.writing = True
-        if not self._writeScheduled:
+        if not self.writePending and not self._writeScheduled:
             self._writeScheduled = self.reactor.callLater(0,
                                                           self._resumeWriting)
 
-
     def stopWriting(self):
         if self._writeScheduled:
             self._writeScheduled.cancel()
             self._writeScheduled = None
         self.writing = False
 
-
     def _resumeWriting(self):
         self._writeScheduled = None
         self.doWrite()
 
 
     def _cbWrite(self, rc, bytes, evt):
+        self.writePending = False
         if self._handleWrite(rc, bytes, evt):
             self.doWrite()
 
@@ -208,11 +206,9 @@
                                     (errno.errorcode.get(rc, 'unknown'), rc))))
             return False
         else:
-            self.offset += bytes
             # If there is nothing left to send,
-            if self.offset == len(self.dataBuffer) and not self._tempDataLen:
+            if bytes == len(self.dataBuffer) and not self._tempDataLen:
                 self.dataBuffer = ""
-                self.offset = 0
                 # stop writing
                 self.stopWriting()
                 # If I've got a producer who is supposed to supply me with data
@@ -227,35 +223,42 @@
                     self.connectionLost(failure.Failure(main.CONNECTION_DONE))
                 elif self._writeDisconnecting:
                     # I was previously asked to to half-close the connection.
+                    self._closeWriteConnection()
                     self._writeDisconnected = True
-                    self._closeWriteConnection()
                 return False
             else:
+                if bytes > 0:
+                      if bytes < len(self.dataBuffer):
+                        # remove processed bytes
+                        self.dataBuffer = buffer(self.dataBuffer, bytes)
+                    else:
+                        self.databuffer = ""
                 return True
 
 
     def doWrite(self):
-        if len(self.dataBuffer) - self.offset < self.SEND_LIMIT:
+        ''' should only called when no current write is pending, 
+            we dont know where to start the write from until we know how many were written
+        '''
+        if self.writePending:
+            return
+        if len(self.dataBuffer) < self.SEND_LIMIT:
             # If there is currently less than SEND_LIMIT bytes left to send
             # in the string, extend it with the array data.
-            self.dataBuffer = (buffer(self.dataBuffer, self.offset) +
-                               "".join(self._tempDataBuffer))
-            self.offset = 0
+            self.dataBuffer += "".join(self._tempDataBuffer)
             self._tempDataBuffer = []
             self._tempDataLen = 0
 
         evt = _iocp.Event(self._cbWrite, self)
 
         # Send as much data as you can.
-        if self.offset:
-            evt.buff = buff = buffer(self.dataBuffer, self.offset)
+        evt.buff = buff = self.dataBuffer
+        rc, _bytes = self.writeToHandle(buff, evt)
+        if rc and rc != ERROR_IO_PENDING:
+            self._handleWrite(rc, 0, evt)
         else:
-            evt.buff = buff = self.dataBuffer
-        rc, bytes = self.writeToHandle(buff, evt)
-        if rc and rc != ERROR_IO_PENDING:
-            self._handleWrite(rc, bytes, evt)
+            self.writePending = True
 
-
     def writeToHandle(self, buff, evt):
         raise NotImplementedError() # TODO: this should default to WriteFile