annotate mercurial/pure/mpatch.py @ 34435:5326e4ef1dab

style: never put multiple statements on one line Differential Revision: https://phab.mercurial-scm.org/D905
author Alex Gaynor <agaynor@mozilla.com>
date Fri, 29 Sep 2017 15:49:20 +0000
parents 0e8b0b9a7acc
children 644a02f6b34f
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1 # mpatch.py - Python implementation of mpatch.c
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2 #
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> and others
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import struct
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11
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12 from .. import pycompat
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13 stringio = pycompat.stringio
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14
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15 class mpatchError(Exception):
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16 """error raised when a delta cannot be decoded
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17 """
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18
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19 # This attempts to apply a series of patches in time proportional to
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20 # the total size of the patches, rather than patches * len(text). This
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21 # means rather than shuffling strings around, we shuffle around
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22 # pointers to fragments with fragment lists.
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23 #
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24 # When the fragment lists get too long, we collapse them. To do this
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25 # efficiently, we do all our operations inside a buffer created by
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26 # mmap and simply use memmove. This avoids creating a bunch of large
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27 # temporary string buffers.
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28
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29 def _pull(dst, src, l): # pull l bytes from src
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30 while l:
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31 f = src.pop()
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32 if f[0] > l: # do we need to split?
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33 src.append((f[0] - l, f[1] + l))
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34 dst.append((l, f[1]))
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35 return
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36 dst.append(f)
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37 l -= f[0]
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38
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39 def _move(m, dest, src, count):
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40 """move count bytes from src to dest
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41
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42 The file pointer is left at the end of dest.
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43 """
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44 m.seek(src)
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45 buf = m.read(count)
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46 m.seek(dest)
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47 m.write(buf)
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48
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49 def _collect(m, buf, list):
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50 start = buf
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51 for l, p in reversed(list):
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52 _move(m, buf, p, l)
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53 buf += l
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54 return (buf - start, start)
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55
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56 def patches(a, bins):
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57 if not bins:
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58 return a
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59
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60 plens = [len(x) for x in bins]
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61 pl = sum(plens)
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62 bl = len(a) + pl
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63 tl = bl + bl + pl # enough for the patches and two working texts
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64 b1, b2 = 0, bl
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65
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66 if not tl:
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67 return a
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68
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69 m = stringio()
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70
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71 # load our original text
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72 m.write(a)
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73 frags = [(len(a), b1)]
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74
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75 # copy all the patches into our segment so we can memmove from them
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76 pos = b2 + bl
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77 m.seek(pos)
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78 for p in bins:
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79 m.write(p)
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80
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81 for plen in plens:
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82 # if our list gets too long, execute it
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83 if len(frags) > 128:
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84 b2, b1 = b1, b2
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85 frags = [_collect(m, b1, frags)]
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86
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87 new = []
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88 end = pos + plen
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89 last = 0
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90 while pos < end:
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91 m.seek(pos)
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92 try:
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93 p1, p2, l = struct.unpack(">lll", m.read(12))
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94 except struct.error:
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95 raise mpatchError("patch cannot be decoded")
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96 _pull(new, frags, p1 - last) # what didn't change
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97 _pull([], frags, p2 - p1) # what got deleted
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98 new.append((l, pos + 12)) # what got added
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99 pos += l + 12
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100 last = p2
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101 frags.extend(reversed(new)) # what was left at the end
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102
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103 t = _collect(m, b2, frags)
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104
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105 m.seek(t[1])
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106 return m.read(t[0])
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107
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108 def patchedsize(orig, delta):
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109 outlen, last, bin = 0, 0, 0
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110 binend = len(delta)
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111 data = 12
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112
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113 while data <= binend:
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114 decode = delta[bin:bin + 12]
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115 start, end, length = struct.unpack(">lll", decode)
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116 if start > end:
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117 break
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118 bin = data + length
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119 data = bin + 12
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120 outlen += start - last
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121 last = end
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122 outlen += length
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123
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124 if bin != binend:
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125 raise mpatchError("patch cannot be decoded")
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126
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127 outlen += orig - last
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128 return outlen