#

#

# 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

        @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