Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/node.py @ 5369:7530334bf301

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revlog: generate trivial deltas against null revision To avoid extra memory usage and performance issues with large files, generate a trivial delta header for deltas against the null revision rather than calling the usual delta generator. We append the delta header to meta rather than prepending it to data to avoid a large allocate and copy.
author Matt Mackall <mpm@selenic.com>
date Wed, 03 Oct 2007 17:17:27 -0500
parents e45fc5d03798
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """
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2 node.py - basic nodeid manipulation for mercurial
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3
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345bac2bc4ec update copyrights.
Vadim Gelfer <vadim.gelfer@gmail.com>
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4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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5
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6 This software may be used and distributed according to the terms
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7 of the GNU General Public License, incorporated herein by reference.
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8 """
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9
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abaee83ce0a6 Replace demandload with new demandimport
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10 import binascii
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11
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3b4e00cba57a Define and use nullrev (revision of nullid) instead of -1.
Thomas Arendsen Hein <thomas@intevation.de>
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12 nullrev = -1
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13 nullid = "\0" * 20
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15 # This ugly style has a noticeable effect in manifest parsing
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16 hex = binascii.hexlify
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17 bin = binascii.unhexlify
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18
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19 def short(node):
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20 return hex(node[:6])