-(NSData*) readDataOfLength:(int)length;
-(NSData*) readAllData;
-(void) writeData:(in NSData*)data;
--(void) writeBytes:(char *)b len:(long)length;
+-(void) writeBytes:(in char *)b len:(long)length;
-(void) lockStream;
-(void) unlockStream;
-(void) shortenData:(long)length;