--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -12,10 +12,7 @@ of the GNU General Public License, incor
 
 import zlib, struct, sha, binascii, heapq
 from mercurial import mdiff
-
-def hex(node): return binascii.hexlify(node)
-def bin(node): return binascii.unhexlify(node)
-def short(node): return hex(node[:6])
+from node import *
 
 def compress(text):
     """ generate a possibly-compressed representation of text """
@@ -38,21 +35,6 @@ def decompress(bin):
     if t == 'u': return bin[1:]
     raise RevlogError("unknown compression type %s" % t)
 
-def hash(text, p1, p2):
-    """generate a hash from the given text and its parent hashes
-
-    This hash combines both the current file contents and its history
-    in a manner that makes it easy to distinguish nodes with the same
-    content in the revision graph.
-    """
-    l = [p1, p2]
-    l.sort()
-    s = sha.new(l[0])
-    s.update(l[1])
-    s.update(text)
-    return s.digest()
-
-nullid = "\0" * 20
 indexformat = ">4l20s20s20s"
 
 class lazyparser: