--- Lib\gzip_old.py	Thu Aug 03 09:27:30 2006
+++ Lib\gzip.py	Mon Dec 29 23:44:54 2008
@@ -5,7 +5,7 @@ but random access is not allowed."""
 
 # based on Andrew Kuchling's minigzip.py distributed with the zlib module
 
-import struct, sys, time
+import os.path, struct, sys, time
 import zlib
 import __builtin__
 
@@ -100,19 +100,23 @@ class GzipFile:
             if hasattr(fileobj, 'mode'): mode = fileobj.mode
             else: mode = 'rb'
 
+        # basename of the original filename for file header (RFC 1952)
+        self.name = os.path.basename(filename)
+        if self.name.endswith(".gz"):
+            self.name = self.name[:-3]
+
         if mode[0:1] == 'r':
             self.mode = READ
             # Set flag indicating start of a new member
             self._new_member = True
             self.extrabuf = ""
             self.extrasize = 0
-            self.filename = filename
             # Starts small, scales exponentially
             self.min_readsize = 100
 
         elif mode[0:1] == 'w' or mode[0:1] == 'a':
             self.mode = WRITE
-            self._init_write(filename)
+            self._init_write()
             self.compress = zlib.compressobj(compresslevel,
                                              zlib.DEFLATED,
                                              -zlib.MAX_WBITS,
@@ -131,10 +135,7 @@ class GzipFile:
         s = repr(self.fileobj)
         return '<gzip ' + s[1:-1] + ' ' + hex(id(self)) + '>'
 
-    def _init_write(self, filename):
-        if filename[-3:] != '.gz':
-            filename = filename + '.gz'
-        self.filename = filename
+    def _init_write(self):
         self.crc = zlib.crc32("")
         self.size = 0
         self.writebuf = []
@@ -143,16 +144,15 @@ class GzipFile:
     def _write_gzip_header(self):
         self.fileobj.write('\037\213')             # magic header
         self.fileobj.write('\010')                 # compression method
-        fname = self.filename[:-3]
         flags = 0
-        if fname:
+        if self.name:
             flags = FNAME
         self.fileobj.write(chr(flags))
         write32u(self.fileobj, long(time.time()))
         self.fileobj.write('\002')
         self.fileobj.write('\377')
-        if fname:
-            self.fileobj.write(fname + '\000')
+        if self.name:
+            self.fileobj.write(self.name + '\000')
 
     def _init_read(self):
         self.crc = zlib.crc32("")