| | 1 | ### -*-pyrex-*- |
| | 2 | ### |
| | 3 | ### Cyclic redundancy checker |
| | 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 | cdef class CRC32: |
| | 27 | """CRC32(): calculate CRC32 of a stream""" |
| | 28 | cdef uint32 _a |
| | 29 | def __cinit__(me, *hunoz, **hukairz): |
| | 30 | me._a = 0 |
| | 31 | def __init__(me): |
| | 32 | pass |
| | 33 | def chunk(me, data): |
| | 34 | """C.chunk(STR): process another chunk of input""" |
| | 35 | cdef void *p |
| | 36 | cdef Py_ssize_t n |
| | 37 | PyObject_AsReadBuffer(data, <cvp *>&p, &n) |
| | 38 | me._a = c_crc32(me._a, p, n) |
| | 39 | return me |
| | 40 | def done(me): |
| | 41 | """C.done() -> INT: return CRC of data""" |
| | 42 | return _u32(me._a) |
| | 43 | |
| | 44 | def crc32(data): |
| | 45 | """crc32(STR) -> INT""" |
| | 46 | cdef void *p |
| | 47 | cdef Py_ssize_t n |
| | 48 | cdef uint32 c |
| | 49 | PyObject_AsReadBuffer(data, <cvp *>&p, &n) |
| | 50 | c = c_crc32(0, p, n) |
| | 51 | return _u32(c) |
| | 52 | |
| | 53 | ###----- That's all, folks -------------------------------------------------- |
~mdw / mLib-python / blame_incremental