socket receive file does not match sent file

zelzel.zsu at gmail.com zelzel.zsu at gmail.com
Sun Nov 6 18:13:03 CET 2005


I wrote two simple socket program.
one for sending a file and the other for receiving the file.
but when I run it, a curious thing happened.
The received file was samller that the sent file.

$ cat receivefile.py
#!/usr/local/bin/python
# -*- coding: utf-8 -*-

import socket
import time
import string
import sys

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(('', 9000))
sock.listen(5)

try:
       while True:
               # 1. client connect, open file
               newSocket, address = sock.accept()
               print "Connected from ", address

               filename = sys.argv[1]
               f=open(  filename, 'wb')

               # 2. recieve data
               while True:
                       data = newSocket.recv(8192)
                       if not data: break
                       f.write(data)
               # 3.close file
               f.close()
	       print filename, "Received\n"

finally:
       sock.close()



$ cat putfile.py
#!/usr/local/bin/python
# -*- coding: utf-8 -*-

import sys
import socket
import string

# "Usage: prog file hostip"

filename   =  sys.argv[1]
host = sys.argv[2]


f=open(filename, 'rb')
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, 9000))

while True:
       data = f.read(8192)
       if not data: break
       else:
               s.send(data)
f.close()
s.close()
print filename, " Sent!\n"

$  python receivefile.py  save_apache_1.33.tar.gz
$ python putfile.py apache_1.33.tar.gz localhost

The result is : save_apache_1.33.tar.gz 's size was smaller then the
apache_1.33.tar.gz file

What is the cause of the problem, can anyone tell me?
Thanks.




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