### -*-pyrex-*-
###
### Cyclic redundancy checker
###
### (c) 2005 Straylight/Edgeware
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the Python interface to mLib.
###
### mLib/Python is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
###
### mLib/Python is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with mLib/Python; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

cdef class CRC32:
  """CRC32(): calculate CRC32 of a stream"""
  cdef uint32 _a
  def __cinit__(me, *hunoz, **hukairz):
    me._a = 0
  def __init__(me):
    pass
  def chunk(me, data):
    """C.chunk(STR): process another chunk of input"""
    cdef void *p
    cdef Py_ssize_t n
    PyObject_AsReadBuffer(data, <cvp *>&p, &n)
    me._a = c_crc32(me._a, p, n)
    return me
  def done(me):
    """C.done() -> INT: return CRC of data"""
    return _u32(me._a)

def crc32(data):
  """crc32(STR) -> INT"""
  cdef void *p
  cdef Py_ssize_t n
  cdef uint32 c
  PyObject_AsReadBuffer(data, <cvp *>&p, &n)
  c = c_crc32(0, p, n)
  return _u32(c)

###----- That's all, folks --------------------------------------------------