view mercurial/node.py @ 13457:e74fe15dc7fd stable

changegroup: verify all stream reads

Mercurial often failed with struct.error or mpatch.mpatchError if incomplete
data was received from a server.

Now we validate all changegroup reads and aborts with
  abort: stream ended unexpectedly (got %d bytes, expected %d)
if less than requested was read.

# 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])