| | 1 | ### -*-pyrex-*- |
| | 2 | ### |
| | 3 | ### Universal hashing interface |
| | 4 | ### |
| | 5 | ### (c) 2005 Straylight/Edgeware |
| | 6 | ### |
| | 7 | |
| | 8 | ###----- Licensing notice --------------------------------------------------- |
| | 9 | ### |
| | 10 | ### This file is part of the Python interface to mLib. |
| | 11 | ### |
| | 12 | ### mLib/Python is free software; you can redistribute it and/or modify |
| | 13 | ### it under the terms of the GNU General Public License as published by |
| | 14 | ### the Free Software Foundation; either version 2 of the License, or |
| | 15 | ### (at your option) any later version. |
| | 16 | ### |
| | 17 | ### mLib/Python is distributed in the hope that it will be useful, |
| | 18 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 19 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 20 | ### GNU General Public License for more details. |
| | 21 | ### |
| | 22 | ### You should have received a copy of the GNU General Public License |
| | 23 | ### along with mLib/Python; if not, write to the Free Software Foundation, |
| | 24 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| | 25 | |
| | 26 | def setglobalkey(uint32 k): |
| | 27 | """setglobalkey(K): set global hash key""" |
| | 28 | unihash_setkey(&unihash_global, k) |
| | 29 | |
| | 30 | cdef class Key: |
| | 31 | """Key(K): universal hashing key""" |
| | 32 | cdef unihash_info _i |
| | 33 | cdef uint32 _k |
| | 34 | def __cinit__(me, uint32 k): |
| | 35 | unihash_setkey(&me._i, k) |
| | 36 | me._k = k |
| | 37 | property k: |
| | 38 | """K.k -> INT: the key value""" |
| | 39 | def __get__(me): |
| | 40 | return _u32(me._k) |
| | 41 | |
| | 42 | cdef class Unihash: |
| | 43 | """Unihash([key = None]): universal hashing context""" |
| | 44 | cdef uint32 _a |
| | 45 | cdef readonly Key key |
| | 46 | cdef unihash_info *_i |
| | 47 | def __cinit__(me, key = None): |
| | 48 | cdef Key k |
| | 49 | me.key = key |
| | 50 | if key is None: |
| | 51 | me._i = &unihash_global |
| | 52 | else: |
| | 53 | k = key |
| | 54 | me._i = &k._i |
| | 55 | me._a = UNIHASH_INIT(me._i) |
| | 56 | def chunk(me, data): |
| | 57 | """U.chunk(STR): hash the STR""" |
| | 58 | cdef void *p |
| | 59 | cdef Py_ssize_t n |
| | 60 | PyObject_AsReadBuffer(data, <cvp *>&p, &n) |
| | 61 | me._a = unihash_hash(me._i, me._a, p, n) |
| | 62 | def done(me): |
| | 63 | """U.done() -> INT: the hash of the data""" |
| | 64 | return _u32(me._a) |
| | 65 | |
| | 66 | ###----- That's all, folks -------------------------------------------------- |
~mdw / mLib-python / blame_incremental