~mdw / mLib-python / blame
| Commit | Line | Data |
|---|---|---|
| 5b1830f3 MW |
1 | ### -*-pyrex-*- |
| 2 | ### | |
| 3 | ### Cyclic redundancy checker | |
| 4 | ### | |
| 5 | ### (c) 2005 Straylight/Edgeware | |
| 6 | ### | |
| 20bce5e9 | 7 | |
| 5b1830f3 MW |
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. | |
| 20bce5e9 | 25 | |
| 20bce5e9 | 26 | cdef class CRC32: |
| addc0c37 | 27 | """CRC32(): calculate CRC32 of a stream""" |
| 20bce5e9 | 28 | cdef uint32 _a |
| efb0bf0e | 29 | def __cinit__(me): |
| 20bce5e9 | 30 | me._a = 0 |
| 31 | def __init__(me): | |
| 32 | pass | |
| efb0bf0e | 33 | def chunk(me, object data): |
| addc0c37 | 34 | """C.chunk(STR): process another chunk of input""" |
| efb0bf0e | 35 | cdef const void *p |
| 78911cdb | 36 | cdef Py_ssize_t n |
| efb0bf0e MW |
37 | PyObject_AsReadBuffer(data, &p, &n) |
| 38 | me._a = _crc32(me._a, p, n) | |
| 20bce5e9 | 39 | return me |
| 40 | def done(me): | |
| addc0c37 | 41 | """C.done() -> INT: return CRC of data""" |
| efb0bf0e | 42 | return me._a |
| 20bce5e9 | 43 | |
| efb0bf0e | 44 | def crc32(object data): |
| addc0c37 | 45 | """crc32(STR) -> INT""" |
| efb0bf0e | 46 | cdef const void *p |
| 78911cdb | 47 | cdef Py_ssize_t n |
| 20bce5e9 | 48 | cdef uint32 c |
| efb0bf0e MW |
49 | PyObject_AsReadBuffer(data, &p, &n) |
| 50 | return _crc32(0, p, n) | |
| 20bce5e9 | 51 | |
| 5b1830f3 | 52 | ###----- That's all, folks -------------------------------------------------- |