diff --git a/src/server.py b/src/server.py
--- a/src/server.py
+++ b/src/server.py
@@ -1,83 +1,83 @@
-import socket
-from hashtree import HashTree
-from networkers import NetworkReader,NetworkWriter
-import collections
-import sys
-import logging as log
-
-import config as conf
-
-
-# debug copy default file
-import shutil
-origFilename=sys.argv[1]
-filename=origFilename+"_"
-shutil.copyfile(origFilename,filename)
-
-
-class Connection:
-	def __init__(self,server_socket):
-		self.socket, address = server_socket.accept()
-		log.info('Connected by {0}'.format(address))
-		fr=self.socket.makefile(mode="rb")
-		fw=self.socket.makefile(mode="wb")
-
-		self.incoming=NetworkReader(fr)
-		self.outcoming=NetworkWriter(fw)
-
-	def __enter__(self):
-		return self.incoming,self.outcoming
-
-	def __exit__(self, exc_type, exc_val, exc_tb):
-		self.socket.close()
-
-
-localTree=HashTree.fromFile(open(filename,mode="rb"))
-
-ss = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-ss.bind(("",conf.port))
-ss.listen(1)
-
-blocksToTransfer=[]
-nodeStack=collections.deque([0])
-
-i1=-1
-
-
-while True:
-	with Connection(ss) as (incoming,outcoming):
-		jsonData,binData=incoming.readMsg()
-		dataFile=open(filename,mode="rb+")
-
-		if jsonData["command"]=="init":
-			assert jsonData["blockSize"]==localTree.BLOCK_SIZE
-			assert jsonData["blockCount"]==localTree.leafCount
-
-		elif jsonData["command"]=="req": # !! index out of range
-			log.info("received request for node #{0}".format(jsonData["index"]))
-			nodeHash=localTree.store[jsonData["index"]]
-
-			jsonResponse={"command":"send", "index":jsonData["index"], "dataType":"hash"}
-			binResponse=nodeHash
-
-			outcoming.writeMsg(jsonResponse,binResponse)
-
-		elif jsonData["command"]=="send" and jsonData["dataType"]=="data": # needlessly allow hashes and data in mixed order
-			log.info("received data block #{0}: {1}...{2}".format(jsonData["index"],binData[:5],binData[-5:]))
-
-			i2=jsonData["index"]
-			if i1+1!=i2:
-				dataFile.seek(i2*localTree.BLOCK_SIZE)
-			dataFile.write(binData)
-			i1=i2
-
-			# never update the hash tree
-
-		elif jsonData["command"]=="end":
-			log.info("closing session...")
-			break
-	
-		else: pass # !! error
-
-dataFile.close()
-sys.exit(0)
+import socket
+from hashtree import HashTree
+from networkers import NetworkReader,NetworkWriter
+import collections
+import sys
+import logging as log
+
+import config as conf
+
+
+# debug copy default file
+import shutil
+origFilename=sys.argv[1]
+filename=origFilename+"_"
+shutil.copyfile(origFilename,filename)
+
+
+class Connection:
+	def __init__(self,server_socket):
+		self.socket, address = server_socket.accept()
+		log.info('Connected by {0}'.format(address))
+		fr=self.socket.makefile(mode="rb")
+		fw=self.socket.makefile(mode="wb")
+
+		self.incoming=NetworkReader(fr)
+		self.outcoming=NetworkWriter(fw)
+
+	def __enter__(self):
+		return self.incoming,self.outcoming
+
+	def __exit__(self, exc_type, exc_val, exc_tb):
+		self.socket.close()
+
+
+localTree=HashTree.fromFile(open(filename,mode="rb"))
+
+ss = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ss.bind(("",conf.port))
+ss.listen(1)
+
+blocksToTransfer=[]
+nodeStack=collections.deque([0])
+
+i1=-1
+
+
+while True:
+	with Connection(ss) as (incoming,outcoming):
+		jsonData,binData=incoming.readMsg()
+		dataFile=open(filename,mode="rb+")
+
+		if jsonData["command"]=="init":
+			assert jsonData["blockSize"]==localTree.BLOCK_SIZE
+			assert jsonData["blockCount"]==localTree.leafCount
+
+		elif jsonData["command"]=="req": # !! index out of range
+			log.info("received request for node #{0}".format(jsonData["index"]))
+			nodeHash=localTree.store[jsonData["index"]]
+
+			jsonResponse={"command":"send", "index":jsonData["index"], "dataType":"hash"}
+			binResponse=nodeHash
+
+			outcoming.writeMsg(jsonResponse,binResponse)
+
+		elif jsonData["command"]=="send" and jsonData["dataType"]=="data": # needlessly allow hashes and data in mixed order
+			log.info("received data block #{0}: {1}...{2}".format(jsonData["index"],binData[:5],binData[-5:]))
+
+			i2=jsonData["index"]
+			if i1+1!=i2:
+				dataFile.seek(i2*localTree.BLOCK_SIZE)
+			dataFile.write(binData)
+			i1=i2
+
+			# never update the hash tree
+
+		elif jsonData["command"]=="end":
+			log.info("closing session...")
+			break
+	
+		else: pass # !! error
+
+dataFile.close()
+sys.exit(0)