view mercurial/cffi/mpatch.py @ 32545:0e8b0b9a7acc

cffi: split modules from pure

The copyright lines are updated per change history.

cffi/osutil.py isn't tested since I have no access to OS X machine right now,
sorry.

# mpatch.py - CFFI implementation of mpatch.c
#
# Copyright 2016 Maciej Fijalkowski <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from ..pure.mpatch import *
from ..pure.mpatch import mpatchError  # silence pyflakes
from . import _mpatch

ffi = _mpatch.ffi
lib = _mpatch.lib

if True:
    if True:
        @ffi.def_extern()
        def cffi_get_next_item(arg, pos):
            all, bins = ffi.from_handle(arg)
            container = ffi.new("struct mpatch_flist*[1]")
            to_pass = ffi.new("char[]", str(bins[pos]))
            all.append(to_pass)
            r = lib.mpatch_decode(to_pass, len(to_pass) - 1, container)
            if r < 0:
                return ffi.NULL
            return container[0]

        def patches(text, bins):
            lgt = len(bins)
            all = []
            if not lgt:
                return text
            arg = (all, bins)
            patch = lib.mpatch_fold(ffi.new_handle(arg),
                                    lib.cffi_get_next_item, 0, lgt)
            if not patch:
                raise mpatchError("cannot decode chunk")
            outlen = lib.mpatch_calcsize(len(text), patch)
            if outlen < 0:
                lib.mpatch_lfree(patch)
                raise mpatchError("inconsistency detected")
            buf = ffi.new("char[]", outlen)
            if lib.mpatch_apply(buf, text, len(text), patch) < 0:
                lib.mpatch_lfree(patch)
                raise mpatchError("error applying patches")
            res = ffi.buffer(buf, outlen)[:]
            lib.mpatch_lfree(patch)
            return res