gh-79315: Add Include/cpython/memoryobject.h header (#99723)

Move non-limited C API from Include/memoryobject.h to a new
Include/cpython/memoryobject.h header file.

1 files changed, 42 insertions, 0 deletions

diff --git a/Include/cpython/memoryobject.h b/Include/cpython/memoryobject.h
new file mode 100644
index 0000000..e2a1e16
--- /dev/null
+++ b/Include/cpython/memoryobject.h
@@ -0,0 +1,42 @@
+#ifndef Py_CPYTHON_MEMORYOBJECT_H
+#  error "this header file must not be included directly"
+#endif
+
+PyAPI_DATA(PyTypeObject) _PyManagedBuffer_Type;
+
+/* 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! */
+#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;
+
+/* 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)