mdw@git.distorted.org.uk Git - mLib-python/blob - unihash.pyx

   1 # -*-pyrex-*-
   2 #
   3 # $Id$
   4 #
   5 # Universal hashing interface
   6 #
   7 # (c) 2005 Straylight/Edgeware
   8 #
   9
  10 #----- Licensing notice -----------------------------------------------------
  11 #
  12 # This file is part of the Python interface to mLib.
  13 #
  14 # mLib/Python is free software; you can redistribute it and/or modify
  15 # it under the terms of the GNU General Public License as published by
  16 # the Free Software Foundation; either version 2 of the License, or
  17 # (at your option) any later version.
  18 #
  19 # mLib/Python is distributed in the hope that it will be useful,
  20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 # GNU General Public License for more details.
  23 #
  24 # You should have received a copy of the GNU General Public License
  25 # along with mLib/Python; if not, write to the Free Software Foundation,
  26 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27
  28 def setglobalkey(uint32 k):
  29   unihash_setkey(&unihash_global, k)
  30
  31 cdef class Key:
  32   cdef unihash_info _i
  33   cdef uint32 _k
  34   def __new__(me, uint32 k):
  35     unihash_setkey(&me._i, k)
  36     me._k = k
  37   property k:
  38     def __get__(me):
  39       return _u32(me._k)
  40
  41 cdef class Unihash:
  42   cdef uint32 _a
  43   cdef readonly Key key
  44   cdef unihash_info *_i
  45   def __new__(me, key = None):
  46     cdef Key k
  47     me.key = key
  48     if key is None:
  49       me._i = &unihash_global
  50     else:
  51       k = key
  52       me._i = &k._i
  53     me._a = UNIHASH_INIT(me._i)
  54   def chunk(me, data):
  55     cdef void *p
  56     cdef int n
  57     PyObject_AsReadBuffer(data, &p, &n)
  58     me._a = unihash_hash(me._i, me._a, p, n)
  59   def done(me):
  60     return _u32(me._a)
  61
  62 #----- That's all, folks ----------------------------------------------------