use libc::{c_void, c_int};
use object::*;
use pyport::Py_ssize_t;

extern "C" {
    pub static mut PyBuffer_Type: PyTypeObject;
}

#[inline(always)]
pub unsafe fn PyBuffer_Check(op : *mut PyObject) -> c_int {
    let u : *mut PyTypeObject = &mut PyBuffer_Type;
    (Py_TYPE(op) == u) as c_int
}

pub const Py_END_OF_BUFFER: Py_ssize_t = -1;

extern "C" {
    pub fn PyBuffer_FromObject(base: *mut PyObject, offset: Py_ssize_t,
                               size: Py_ssize_t) -> *mut PyObject;
    pub fn PyBuffer_FromReadWriteObject(base: *mut PyObject,
                                        offset: Py_ssize_t, size: Py_ssize_t)
     -> *mut PyObject;
    pub fn PyBuffer_FromMemory(ptr: *mut c_void, size: Py_ssize_t)
     -> *mut PyObject;
    pub fn PyBuffer_FromReadWriteMemory(ptr: *mut c_void,
                                        size: Py_ssize_t) -> *mut PyObject;
    pub fn PyBuffer_New(size: Py_ssize_t) -> *mut PyObject;
}