/* Memory view object. In Python this is available as "memoryview". */

#ifndef Py_MEMORYOBJECT_H
#define Py_MEMORYOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_LIMITED_API
PyAPI_DATA(PyTypeObject) _PyManagedBuffer_Type;
#endif
PyAPI_DATA(PyTypeObject) PyMemoryView_Type;

#define PyMemoryView_Check(op) (Py_TYPE(op) == &PyMemoryView_Type)

#ifndef Py_LIMITED_API
/* Get a pointer to the memoryview's private copy of the exporter's buffer. */
#define PyMemoryView_GET_BUFFER(op) (&((PyMemoryViewObject *)(op))->view)
/* Get a pointer to the exporting object (this may be NULL!). */
#define PyMemoryView_GET_BASE(op) (((PyMemoryViewObject *)(op))->view.obj)
#endif

PyAPI_FUNC(PyObject *) PyMemoryView_FromObject(PyObject *base);
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03030000
PyAPI_FUNC(PyObject *) PyMemoryView_FromMemory(char *mem, Py_ssize_t size,
 int flags);
#endif
#ifndef Py_LIMITED_API
PyAPI_FUNC(PyObject *) PyMemoryView_FromBuffer(Py_buffer *info);
#endif
PyAPI_FUNC(PyObject *) PyMemoryView_GetContiguous(PyObject *base,
 int buffertype,
 char order);


/* The structs are declared here so that macros can work, but they shouldn't
 be considered public. Don't access their fields directly, use the macros
 and functions instead! */
#ifndef Py_LIMITED_API
#define _Py_MANAGED_BUFFER_RELEASED 0x001 /* access to exporter blocked */
#define _Py_MANAGED_BUFFER_FREE_FORMAT 0x002 /* free format */
typedef struct {
 PyObject_HEAD
 int flags; /* state flags */
 Py_ssize_t exports; /* number of direct memoryview exports */
 Py_buffer master; /* snapshot buffer obtained from the original exporter */
} _PyManagedBufferObject;


/* memoryview state flags */
#define _Py_MEMORYVIEW_RELEASED 0x001 /* access to master buffer blocked */
#define _Py_MEMORYVIEW_C 0x002 /* C-contiguous layout */
#define _Py_MEMORYVIEW_FORTRAN 0x004 /* Fortran contiguous layout */
#define _Py_MEMORYVIEW_SCALAR 0x008 /* scalar: ndim = 0 */
#define _Py_MEMORYVIEW_PIL 0x010 /* PIL-style layout */

typedef struct {
 PyObject_VAR_HEAD
 _PyManagedBufferObject *mbuf; /* managed buffer */
 Py_hash_t hash; /* hash value for read-only views */
 int flags; /* state flags */
 Py_ssize_t exports; /* number of buffer re-exports */
 Py_buffer view; /* private copy of the exporter's view */
 PyObject *weakreflist;
 Py_ssize_t ob_array[1]; /* shape, strides, suboffsets */
} PyMemoryViewObject;
#endif

#ifdef __cplusplus
}
#endif
#endif /* !Py_MEMORYOBJECT_H */