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/* Wrap void* pointers to be passed between C modules */

#include "Python.h"

/* Declarations for objects of type PyCObject */

typedef void (*destructor1)(void *);

typedef void (*destructor2)(void *, void*);

static int cobject_deprecation_warning(void)

{

return PyErr_WarnPy3k("CObject type is not supported in 3.x. "

"Please use capsule objects instead.", 1);

}

PyObject *

PyCObject_FromVoidPtr(void *cobj, void (*destr)(void *))

{

PyCObject *self;

if (cobject_deprecation_warning()) {

return NULL;

}

self = PyObject_NEW(PyCObject, &PyCObject_Type);

if (self == NULL)

return NULL;

self->cobject=cobj;

self->destructor=destr;

self->desc=NULL;

return (PyObject *)self;

}

PyObject *

PyCObject_FromVoidPtrAndDesc(void *cobj, void *desc,

void (*destr)(void *, void *))

{

PyCObject *self;

if (cobject_deprecation_warning()) {

return NULL;

}

if (!desc) {

PyErr_SetString(PyExc_TypeError,

"PyCObject_FromVoidPtrAndDesc called with null"

" description");

return NULL;

}

self = PyObject_NEW(PyCObject, &PyCObject_Type);

if (self == NULL)

return NULL;

self->cobject = cobj;

self->destructor = (destructor1)destr;

self->desc = desc;

return (PyObject *)self;

}

void *

PyCObject_AsVoidPtr(PyObject *self)

{

if (self) {

if (PyCapsule_CheckExact(self)) {

const char *name = PyCapsule_GetName(self);

return (void *)PyCapsule_GetPointer(self, name);

}

if (self->ob_type == &PyCObject_Type)

return ((PyCObject *)self)->cobject;

PyErr_SetString(PyExc_TypeError,

"PyCObject_AsVoidPtr with non-C-object");

}

if (!PyErr_Occurred())

PyErr_SetString(PyExc_TypeError,

"PyCObject_AsVoidPtr called with null pointer");

return NULL;

}

void *

PyCObject_GetDesc(PyObject *self)

{

if (self) {

if (self->ob_type == &PyCObject_Type)

return ((PyCObject *)self)->desc;

PyErr_SetString(PyExc_TypeError,

"PyCObject_GetDesc with non-C-object");

}

if (!PyErr_Occurred())

PyErr_SetString(PyExc_TypeError,

"PyCObject_GetDesc called with null pointer");

return NULL;

}

void *

PyCObject_Import(char *module_name, char *name)

{

PyObject *m, *c;

void *r = NULL;

if ((m = PyImport_ImportModule(module_name))) {

if ((c = PyObject_GetAttrString(m,name))) {

r = PyCObject_AsVoidPtr(c);

Py_DECREF(c);

}

Py_DECREF(m);

}

return r;

}

int

PyCObject_SetVoidPtr(PyObject *self, void *cobj)

{

PyCObject* cself = (PyCObject*)self;

if (cself == NULL || !PyCObject_Check(cself) ||

cself->destructor != NULL) {

PyErr_SetString(PyExc_TypeError,

"Invalid call to PyCObject_SetVoidPtr");

return 0;

}

cself->cobject = cobj;

return 1;

}

static void

PyCObject_dealloc(PyCObject *self)

{

if (self->destructor) {

if(self->desc)

((destructor2)(self->destructor))(self->cobject, self->desc);

else

(self->destructor)(self->cobject);

}

PyObject_DEL(self);

}

PyDoc_STRVAR(PyCObject_Type__doc__,

"C objects to be exported from one extension module to another\n\

\n\

C objects are used for communication between extension modules. They\n\

provide a way for an extension module to export a C interface to other\n\

extension modules, so that extension modules can use the Python import\n\

mechanism to link to one another.");

PyTypeObject PyCObject_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"PyCObject", /*tp_name*/

sizeof(PyCObject), /*tp_basicsize*/

0, /*tp_itemsize*/

/* methods */

(destructor)PyCObject_dealloc, /*tp_dealloc*/

0, /*tp_print*/

0, /*tp_getattr*/

0, /*tp_setattr*/

0, /*tp_compare*/

0, /*tp_repr*/

0, /*tp_as_number*/

0, /*tp_as_sequence*/

0, /*tp_as_mapping*/

0, /*tp_hash*/

0, /*tp_call*/

0, /*tp_str*/

0, /*tp_getattro*/

0, /*tp_setattro*/

0, /*tp_as_buffer*/

0, /*tp_flags*/

PyCObject_Type__doc__ /*tp_doc*/

};