annotate mercurial/changegroup.py @ 3420:52617d992eed

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author Matt Mackall <mpm@selenic.com>
date Tue, 17 Oct 2006 18:30:18 -0500
parents fe1689273f84
children
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1981
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1 """
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2 changegroup.py - Mercurial changegroup manipulation functions
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4 Copyright 2006 Matt Mackall <mpm@selenic.com>
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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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802e8a029d99 Added missing gettext import to changegroup.py.
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9 from i18n import gettext as _
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10 from demandload import *
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fe1689273f84 use demandload more.
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11 demandload(globals(), "struct util")
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13 def getchunk(source):
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14 """get a chunk from a changegroup"""
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15 d = source.read(4)
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16 if not d:
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17 return ""
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18 l = struct.unpack(">l", d)[0]
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19 if l <= 4:
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20 return ""
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21 d = source.read(l - 4)
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22 if len(d) < l - 4:
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23 raise util.Abort(_("premature EOF reading chunk"
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24 " (got %d bytes, expected %d)")
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25 % (len(d), l - 4))
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26 return d
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27
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28 def chunkiter(source):
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29 """iterate through the chunks in source"""
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30 while 1:
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31 c = getchunk(source)
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32 if not c:
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33 break
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34 yield c
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35
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36 def genchunk(data):
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37 """build a changegroup chunk"""
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38 header = struct.pack(">l", len(data)+ 4)
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39 return "%s%s" % (header, data)
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41 def closechunk():
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42 return struct.pack(">l", 0)
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43