|
|
# mpatch.py - CFFI implementation of mpatch.c
|
|
|
#
|
|
|
# Copyright 2016 Maciej Fijalkowski <fijall@gmail.com>
|
|
|
#
|
|
|
# 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 # pytype: disable=import-error
|
|
|
|
|
|
ffi = _mpatch.ffi
|
|
|
lib = _mpatch.lib
|
|
|
|
|
|
|
|
|
@ffi.def_extern()
|
|
|
def cffi_get_next_item(arg, pos):
|
|
|
all, bins = ffi.from_handle(arg)
|
|
|
container = ffi.new(b"struct mpatch_flist*[1]")
|
|
|
to_pass = ffi.new(b"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(b"cannot decode chunk")
|
|
|
outlen = lib.mpatch_calcsize(len(text), patch)
|
|
|
if outlen < 0:
|
|
|
lib.mpatch_lfree(patch)
|
|
|
raise mpatchError(b"inconsistency detected")
|
|
|
buf = ffi.new(b"char[]", outlen)
|
|
|
if lib.mpatch_apply(buf, text, len(text), patch) < 0:
|
|
|
lib.mpatch_lfree(patch)
|
|
|
raise mpatchError(b"error applying patches")
|
|
|
res = ffi.buffer(buf, outlen)[:]
|
|
|
lib.mpatch_lfree(patch)
|
|
|
return res
|
|
|
|
