Incorrect signature for PyObject_AsCharBuffer

[GoogleCodeExporter]

Python 2.5 (and above) changed the signature of PyObject_AsCharBuffer to:

int PyObject_AsCharBuffer(PyObject *obj, const char **buffer, Py_ssize_t 
*buffer_len)

This matters on 64-bit systems, where Py_ssize_t is 64-bits, but int is 
32-bits. The signature in event.pyx is:

    int    PyObject_AsCharBuffer(object obj, char **buffer, int *buffer_len)

This causes the 4-bytes on the stack beside *buffer_len to get clobbered, 
leading to random crashes/corruption.

Original issue reported on code.google.com by [email protected] on 8 Jan 2013 at 5:35