1  #ifndef Py_CPYTHON_MEMORYOBJECT_H
       2  #  error "this header file must not be included directly"
       3  #endif
       4  
       5  PyAPI_DATA(PyTypeObject) _PyManagedBuffer_Type;
       6  
       7  /* The structs are declared here so that macros can work, but they shouldn't
       8     be considered public. Don't access their fields directly, use the macros
       9     and functions instead! */
      10  #define _Py_MANAGED_BUFFER_RELEASED    0x001  /* access to exporter blocked */
      11  #define _Py_MANAGED_BUFFER_FREE_FORMAT 0x002  /* free format */
      12  
      13  typedef struct {
      14      PyObject_HEAD
      15      int flags;          /* state flags */
      16      Py_ssize_t exports; /* number of direct memoryview exports */
      17      Py_buffer master; /* snapshot buffer obtained from the original exporter */
      18  } _PyManagedBufferObject;
      19  
      20  
      21  /* memoryview state flags */
      22  #define _Py_MEMORYVIEW_RELEASED    0x001  /* access to master buffer blocked */
      23  #define _Py_MEMORYVIEW_C           0x002  /* C-contiguous layout */
      24  #define _Py_MEMORYVIEW_FORTRAN     0x004  /* Fortran contiguous layout */
      25  #define _Py_MEMORYVIEW_SCALAR      0x008  /* scalar: ndim = 0 */
      26  #define _Py_MEMORYVIEW_PIL         0x010  /* PIL-style layout */
      27  #define _Py_MEMORYVIEW_RESTRICTED  0x020  /* Disallow new references to the memoryview's buffer */
      28  
      29  typedef struct {
      30      PyObject_VAR_HEAD
      31      _PyManagedBufferObject *mbuf; /* managed buffer */
      32      Py_hash_t hash;               /* hash value for read-only views */
      33      int flags;                    /* state flags */
      34      Py_ssize_t exports;           /* number of buffer re-exports */
      35      Py_buffer view;               /* private copy of the exporter's view */
      36      PyObject *weakreflist;
      37      Py_ssize_t ob_array[1];       /* shape, strides, suboffsets */
      38  } PyMemoryViewObject;
      39  
      40  #define _PyMemoryView_CAST(op) _Py_CAST(PyMemoryViewObject*, op)
      41  
      42  /* Get a pointer to the memoryview's private copy of the exporter's buffer. */
      43  static inline Py_buffer* PyMemoryView_GET_BUFFER(PyObject *op) {
      44      return (&_PyMemoryView_CAST(op)->view);
      45  }
      46  #define PyMemoryView_GET_BUFFER(op) PyMemoryView_GET_BUFFER(_PyObject_CAST(op))
      47  
      48  /* Get a pointer to the exporting object (this may be NULL!). */
      49  static inline PyObject* PyMemoryView_GET_BASE(PyObject *op) {
      50      return _PyMemoryView_CAST(op)->view.obj;
      51  }
      52  #define PyMemoryView_GET_BASE(op) PyMemoryView_GET_BASE(_PyObject_CAST(op))