diff --git a/src/file_transfers.py b/src/file_transfers.py
index 92a9657..9f4cd42 100644
--- a/src/file_transfers.py
+++ b/src/file_transfers.py
@@ -4,15 +4,42 @@ from toxcore_enums_and_consts import TOX_FILE_KIND
 from os.path import basename, getsize
 
 
+TOX_FILE_TRANSFER_STATE = {
+    'RUNNING': 0,
+    'PAUSED': 1,
+    'CANCELED': 2,
+    'FINISHED': 3,
+}
+
+
 class FileTransfer(object):
-    def __init__(self, path, tox, friend_number):
+    def __init__(self, path, tox, friend_number, file_number = None):
         self._path = path
         self._tox = tox
         self._friend_number = friend_number
+        self.state = TOX_FILE_TRANSFER_STATE['RUNNING']
+        self._file_number = file_number
 
     def set_tox(self, tox):
         self._tox = tox
 
+    def get_file_number(self):
+        return self._file_number
+
+    def get_friend_number(self):
+        return self._friend_number
+
+    def send_control(self, control):
+        if self._tox.file_control(self._friend_number, self._file_number, control):
+            self.state = control
+
+    def get_file_id(self):
+        return self._tox.file_get_file_id(self._friend_number, self._file_number)
+
+    def file_seek(self):
+        # TODO implement
+        pass
+
 
 class SendTransfer(FileTransfer):
     def __init__(self, path, tox, friend_number):
@@ -20,9 +47,6 @@ class SendTransfer(FileTransfer):
         self._file_number = tox.file_send(friend_number, TOX_FILE_KIND['DATA'], getsize(path), None, basename(path))
         self._file = open(path, 'rb')
 
-    def get_file_number(self):
-        return self._file_number
-
     def send_chunk(self, position, size):
         self._file.seek(position)
         data = self._file.read(size)
@@ -30,19 +54,22 @@ class SendTransfer(FileTransfer):
 
 
 class ReceiveTransfer(FileTransfer):
-    def __init__(self, path, tox, friend_number):
-        super(self.__class__, self).__init__(path, tox, friend_number)
+    def __init__(self, path, tox, friend_number, file_number):
+        super(self.__class__, self).__init__(path, tox, friend_number, file_number)
         self._file = open(self._path, 'wb')
         self._file.truncate(0)
+        self._size = 0
 
     def write_chunk(self, position, data):
         if data is not None:
-            size = getsize(self._path)
-            if size < position:
+            data = ''.join(chr(x) for x in data)
+            if self._size < position:
                 self._file.seek(0, 2)
-                self._file.write('\0' * (position - size))
+                self._file.write('\0' * (position - self._size))
             self._file.seek(position)
-            self._file.write(''.join(chr(x) for x in data))
+            self._file.write(data)
             self._file.flush()
+            if position + len(data) > self._size:
+                self._size = position + len(data)
         else:
             self._file.close()