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# Buffer Protocol

int `PyObject_AsCharBuffer`( PyObject *obj, const char **buffer, Py_ssize_t *buffer_len)
  Returns a pointer to a read-only memory location usable as character-based input. The obj argument must support the single-segment character buffer interface. On success, returns `0`, sets buffer to the memory location and buffer_len to the buffer length. Returns `-1` and sets a `TypeError` on error.

int `PyObject_AsReadBuffer`( PyObject *obj, const void **buffer, Py_ssize_t *buffer_len)
  Returns a pointer to a read-only memory location containing arbitrary data. The obj argument must support the single-segment readable buffer interface. On success, returns `0`, sets buffer to the memory location and buffer_len to the buffer length. Returns `-1` and sets a `TypeError` on error.

int `PyObject_CheckReadBuffer`( PyObject *o)
  Returns `1` if o supports the single-segment readable buffer interface. Otherwise returns `0`.

int `PyObject_AsWriteBuffer`( PyObject *obj, void **buffer, Py_ssize_t *buffer_len)
  Returns a pointer to a writable memory location. The obj argument must support the single-segment, character buffer interface. On success, returns `0`, sets buffer to the memory location and buffer_len to the buffer length. Returns `-1` and sets a `TypeError` on error.

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