Index: http.py
===================================================================
--- http.py	(revision 57)
+++ http.py	(working copy)
@@ -4,6 +4,7 @@
 
 import cStringIO
 import dpkt
+import gzip
 
 def parse_headers(f):
     """Return dict of HTTP headers parsed from a file object."""
@@ -87,9 +92,6 @@
     def pack_hdr(self):
         return ''.join([ '%s: %s\r\n' % t for t in self.headers.iteritems() ])
     
     def __str__(self):
         return '%s\r\n%s' % (self.pack_hdr(), self.body)
 
@@ -114,6 +116,7 @@
         'BASELINE-CONTROL'
         ))
     __proto = 'HTTP'
+    __len = -1
 
     def unpack(self, buf):
         f = cStringIO.StringIO(buf)
@@ -126,7 +129,13 @@
         self.uri = l[1]
         self.version = l[2][len(self.__proto)+1:]
         Message.unpack(self, f.read())
+        self.__len = f.tell()
 
+    def __len__(self):
+        if len == -1:
+            return len(str(self))
+        return self.__len
+
     def __str__(self):
         return '%s %s %s/%s\r\n' % (self.method, self.uri, self.__proto,
                                     self.version) + Message.__str__(self)
@@ -139,7 +148,8 @@
         'reason':'OK'
         }
     __proto = 'HTTP'
-    
+    __len = 0
+
     def unpack(self, buf):
         f = cStringIO.StringIO(buf)
         line = f.readline()
@@ -150,7 +160,13 @@
         self.status = l[1]
         self.reason = l[2]
         Message.unpack(self, f.read())
+        self.__len = f.tell()
 
+    def __len__(self):
+        if len == -1:
+            return len(str(self))
+        return self.__len
+
     def __str__(self):
         return '%s/%s %s %s\r\n' % (self.__proto, self.version, self.status,
                                     self.reason) + Message.__str__(self)