Mercurial > hg
annotate mercurial/cffi/mpatch.py @ 39245:071f97d03acb
manifest: rename manifestlog._treeinmem to ._treemanifests
Not sure what "inmem" was supposed to indicate. This object is an
interface to manifest data on disk as well as "in memory" (assuming
that's what "inmem" means).
Differential Revision: https://phab.mercurial-scm.org/D4278
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 10 Aug 2018 15:06:41 -0700 |
parents | 857876ebaed4 |
children | 2372284d9457 |
rev | line source |
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1 # mpatch.py - CFFI implementation of mpatch.c |
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2 # |
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3 # Copyright 2016 Maciej Fijalkowski <fijall@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 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 from ..pure.mpatch import * |
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11 from ..pure.mpatch import mpatchError # silence pyflakes |
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12 from . import _mpatch |
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13 |
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14 ffi = _mpatch.ffi |
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15 lib = _mpatch.lib |
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16 |
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17 @ffi.def_extern() |
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18 def cffi_get_next_item(arg, pos): |
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19 all, bins = ffi.from_handle(arg) |
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20 container = ffi.new("struct mpatch_flist*[1]") |
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21 to_pass = ffi.new("char[]", str(bins[pos])) |
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22 all.append(to_pass) |
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23 r = lib.mpatch_decode(to_pass, len(to_pass) - 1, container) |
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24 if r < 0: |
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25 return ffi.NULL |
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26 return container[0] |
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27 |
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28 def patches(text, bins): |
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29 lgt = len(bins) |
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30 all = [] |
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31 if not lgt: |
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32 return text |
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33 arg = (all, bins) |
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34 patch = lib.mpatch_fold(ffi.new_handle(arg), |
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35 lib.cffi_get_next_item, 0, lgt) |
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36 if not patch: |
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37 raise mpatchError("cannot decode chunk") |
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38 outlen = lib.mpatch_calcsize(len(text), patch) |
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39 if outlen < 0: |
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40 lib.mpatch_lfree(patch) |
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41 raise mpatchError("inconsistency detected") |
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42 buf = ffi.new("char[]", outlen) |
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43 if lib.mpatch_apply(buf, text, len(text), patch) < 0: |
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44 lib.mpatch_lfree(patch) |
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45 raise mpatchError("error applying patches") |
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46 res = ffi.buffer(buf, outlen)[:] |
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47 lib.mpatch_lfree(patch) |
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48 return res |