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/* Test PEP 688 - Buffers */
#include "parts.h"
#include "structmember.h" // PyMemberDef
#include <stddef.h> // offsetof
typedef struct {
PyObject_HEAD
PyObject *obj;
Py_ssize_t references;
} testBufObject;
static PyObject *
testbuf_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *obj = PyBytes_FromString("test");
if (obj == NULL) {
return NULL;
}
testBufObject *self = (testBufObject *)type->tp_alloc(type, 0);
if (self == NULL) {
Py_DECREF(obj);
return NULL;
}
self->obj = obj;
self->references = 0;
return (PyObject *)self;
}
static int
testbuf_traverse(testBufObject *self, visitproc visit, void *arg)
{
Py_VISIT(self->obj);
return 0;
}
static int
testbuf_clear(testBufObject *self)
{
Py_CLEAR(self->obj);
return 0;
}
static void
testbuf_dealloc(testBufObject *self)
{
PyObject_GC_UnTrack(self);
Py_XDECREF(self->obj);
Py_TYPE(self)->tp_free((PyObject *) self);
}
static int
testbuf_getbuf(testBufObject *self, Py_buffer *view, int flags)
{
int buf = PyObject_GetBuffer(self->obj, view, flags);
Py_SETREF(view->obj, Py_NewRef(self));
self->references++;
return buf;
}
static void
testbuf_releasebuf(testBufObject *self, Py_buffer *view)
{
self->references--;
assert(self->references >= 0);
}
static PyBufferProcs testbuf_as_buffer = {
.bf_getbuffer = (getbufferproc) testbuf_getbuf,
.bf_releasebuffer = (releasebufferproc) testbuf_releasebuf,
};
static struct PyMemberDef testbuf_members[] = {
{"references", T_PYSSIZET, offsetof(testBufObject, references), READONLY},
{NULL},
};
static PyTypeObject testBufType = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "testBufType",
.tp_basicsize = sizeof(testBufObject),
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
.tp_new = testbuf_new,
.tp_dealloc = (destructor) testbuf_dealloc,
.tp_traverse = (traverseproc) testbuf_traverse,
.tp_clear = (inquiry) testbuf_clear,
.tp_as_buffer = &testbuf_as_buffer,
.tp_members = testbuf_members
};
int
_PyTestCapi_Init_Buffer(PyObject *m) {
if (PyType_Ready(&testBufType) < 0) {
return -1;
}
if (PyModule_AddObjectRef(m, "testBuf", (PyObject *)&testBufType)) {
return -1;
}
return 0;
}
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