upstream/mercurial-mirror Files · mercurial/cffi/mpatch.py

thirdparty: vendor cbor2 python library...

thirdparty: vendor cbor2 python library CBOR stands for Concise Binary Object Representation, which is a data format which is very compact and extensible. This patch moves the python library which can serilaize and deserialize python objects to/from cbor formats. The library is taken from https://github.com/agronholm/cbor2/ from commit 84181540f6eb650437e3f73cd104a65661fe8e67. Unrequired files from the cbor library - docs/, tests/, setup.py, setup.cfg, and tox.ini - have not been vendored. There is another python library for cbor at https://github.com/brianolson/cbor_py/ which is used in evolve extension and was imported in initial version of this series. That library though contains C code and is bit faster, but has known bugs around serializing nested structures, is unmaintained, raises an Exception object instead of a more dedicated Error type. So, it's better to use a bug free and actively maintained library. This library is not yet used and will be used in later commits. # no-check-commit because we are importing a third library module Differential Revision: https://phab.mercurial-scm.org/D2750

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        Yuya Nishihara
    
cffi: split modules from pure...

              r32512
            
      # 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

      ffi = _mpatch.ffi

      lib = _mpatch.lib

        Yuya Nishihara
    
cffi: remove superfluous "if True" blocks

              r32513
            
      @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]

        Yuya Nishihara
    
cffi: split modules from pure...

              r32512
            
        Yuya Nishihara
    
cffi: remove superfluous "if True" blocks

              r32513
            
      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

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Yuya Nishihara cffi: split modules from pure...	r32512	# 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

		ffi = _mpatch.ffi
		lib = _mpatch.lib

Yuya Nishihara cffi: remove superfluous "if True" blocks	r32513	@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]
Yuya Nishihara cffi: split modules from pure...	r32512
Yuya Nishihara cffi: remove superfluous "if True" blocks	r32513	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