view mercurial/node.py @ 16955:92e1c64ba0d4

parsers: add a C function to pack the dirstate

This is about 9 times faster than the Python dirstate packing code.
The relatively small speedup is due to the poor locality and memory
access patterns caused by traversing dicts and other boxed Python
values.

# node.py - basic nodeid manipulation for mercurial
#
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import binascii

nullrev = -1
nullid = "\0" * 20

# This ugly style has a noticeable effect in manifest parsing
hex = binascii.hexlify
bin = binascii.unhexlify

def short(node):
    return hex(node[:6])