author | Boris Feld <boris.feld@octobus.net> |
Thu, 22 Nov 2018 18:44:07 +0100 | |
changeset 40751 | 41b6245c3fc4 |
parent 33572 | 857876ebaed4 |
child 43076 | 2372284d9457 |
permissions | -rw-r--r-- |
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# bdiff.py - CFFI implementation of bdiff.c |
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# |
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# Copyright 2016 Maciej Fijalkowski <fijall@gmail.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import struct |
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from ..pure.bdiff import * |
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from . import _bdiff |
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ffi = _bdiff.ffi |
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lib = _bdiff.lib |
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def blocks(sa, sb): |
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a = ffi.new("struct bdiff_line**") |
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b = ffi.new("struct bdiff_line**") |
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ac = ffi.new("char[]", str(sa)) |
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bc = ffi.new("char[]", str(sb)) |
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l = ffi.new("struct bdiff_hunk*") |
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try: |
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an = lib.bdiff_splitlines(ac, len(sa), a) |
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bn = lib.bdiff_splitlines(bc, len(sb), b) |
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if not a[0] or not b[0]: |
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raise MemoryError |
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count = lib.bdiff_diff(a[0], an, b[0], bn, l) |
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if count < 0: |
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raise MemoryError |
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rl = [None] * count |
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h = l.next |
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i = 0 |
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while h: |
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rl[i] = (h.a1, h.a2, h.b1, h.b2) |
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h = h.next |
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i += 1 |
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finally: |
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lib.free(a[0]) |
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lib.free(b[0]) |
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lib.bdiff_freehunks(l.next) |
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return rl |
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def bdiff(sa, sb): |
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a = ffi.new("struct bdiff_line**") |
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b = ffi.new("struct bdiff_line**") |
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ac = ffi.new("char[]", str(sa)) |
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bc = ffi.new("char[]", str(sb)) |
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l = ffi.new("struct bdiff_hunk*") |
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try: |
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an = lib.bdiff_splitlines(ac, len(sa), a) |
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bn = lib.bdiff_splitlines(bc, len(sb), b) |
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if not a[0] or not b[0]: |
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raise MemoryError |
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count = lib.bdiff_diff(a[0], an, b[0], bn, l) |
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if count < 0: |
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raise MemoryError |
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rl = [] |
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h = l.next |
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la = lb = 0 |
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while h: |
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if h.a1 != la or h.b1 != lb: |
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lgt = (b[0] + h.b1).l - (b[0] + lb).l |
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rl.append(struct.pack(">lll", (a[0] + la).l - a[0].l, |
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(a[0] + h.a1).l - a[0].l, lgt)) |
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rl.append(str(ffi.buffer((b[0] + lb).l, lgt))) |
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la = h.a2 |
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lb = h.b2 |
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h = h.next |
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finally: |
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lib.free(a[0]) |
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lib.free(b[0]) |
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lib.bdiff_freehunks(l.next) |
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return "".join(rl) |