Mercurial > hg
annotate mercurial/cffi/mpatch.py @ 36160:9fd8c2a3db5a
narrowspec: move module into core
Having support for parsing the narrow specification in core is
necessary for moving many other parts of narrow to core.
We do still want to harmonize the narrow spec with the sparse
spec. And the format needs to be documented. But this shouldn't
hold up the code moving to core.
Differential Revision: https://phab.mercurial-scm.org/D2201
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 12 Feb 2018 16:21:34 -0800 |
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 |