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.. highlight:: c
.. _picklebuffer-objects:
.. index::
pair: object; PickleBuffer
Pickle buffer objects
---------------------
.. versionadded:: 3.8
A :class:`pickle.PickleBuffer` object wraps a :ref:`buffer-providing object
<bufferobjects>` for out-of-band data transfer with the :mod:`pickle` module.
.. c:var:: PyTypeObject PyPickleBuffer_Type
This instance of :c:type:`PyTypeObject` represents the Python pickle buffer type.
This is the same object as :class:`pickle.PickleBuffer` in the Python layer.
.. c:function:: int PyPickleBuffer_Check(PyObject *op)
Return true if *op* is a pickle buffer instance.
This function always succeeds.
.. c:function:: PyObject *PyPickleBuffer_FromObject(PyObject *obj)
Create a pickle buffer from the object *obj*.
This function will fail if *obj* doesn't support the :ref:`buffer protocol <bufferobjects>`.
On success, return a new pickle buffer instance.
On failure, set an exception and return ``NULL``.
Analogous to calling :class:`pickle.PickleBuffer` with *obj* in Python.
.. c:function:: const Py_buffer *PyPickleBuffer_GetBuffer(PyObject *picklebuf)
Get a pointer to the underlying :c:type:`Py_buffer` that the pickle buffer wraps.
The returned pointer is valid as long as *picklebuf* is alive and has not been
released. The caller must not modify or free the returned :c:type:`Py_buffer`.
If the pickle buffer has been released, raise :exc:`ValueError`.
On success, return a pointer to the buffer view.
On failure, set an exception and return ``NULL``.
.. c:function:: int PyPickleBuffer_Release(PyObject *picklebuf)
Release the underlying buffer held by the pickle buffer.
Return ``0`` on success. On failure, set an exception and return ``-1``.
Analogous to calling :meth:`pickle.PickleBuffer.release` in Python.
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