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// Copyright (c) 2017-present PyO3 Project and Contributors

//! Represent Python Buffer protocol implementation
//!
//! For more information check [buffer protocol](https://docs.python.org/3/c-api/buffer.html)
//! c-api
use crate::callback::IntoPyCallbackOutput;
use crate::{
    ffi::{self, PyBufferProcs},
    PyCell, PyClass, PyRefMut,
};
use std::os::raw::c_int;

/// Buffer protocol interface
///
/// For more information check [buffer protocol](https://docs.python.org/3/c-api/buffer.html)
/// c-api
#[allow(unused_variables)]
pub trait PyBufferProtocol<'p>: PyClass {
    fn bf_getbuffer(slf: PyRefMut<Self>, view: *mut ffi::Py_buffer, flags: c_int) -> Self::Result
    where
        Self: PyBufferGetBufferProtocol<'p>,
    {
        unimplemented!()
    }

    fn bf_releasebuffer(slf: PyRefMut<Self>, view: *mut ffi::Py_buffer) -> Self::Result
    where
        Self: PyBufferReleaseBufferProtocol<'p>,
    {
        unimplemented!()
    }
}

pub trait PyBufferGetBufferProtocol<'p>: PyBufferProtocol<'p> {
    type Result: IntoPyCallbackOutput<()>;
}

pub trait PyBufferReleaseBufferProtocol<'p>: PyBufferProtocol<'p> {
    type Result: IntoPyCallbackOutput<()>;
}

/// Set functions used by `#[pyproto]`.
#[doc(hidden)]
impl PyBufferProcs {
    pub fn set_getbuffer<T>(&mut self)
    where
        T: for<'p> PyBufferGetBufferProtocol<'p>,
    {
        self.bf_getbuffer = bf_getbuffer::<T>();
    }
    pub fn set_releasebuffer<T>(&mut self)
    where
        T: for<'p> PyBufferReleaseBufferProtocol<'p>,
    {
        self.bf_releasebuffer = bf_releasebuffer::<T>();
    }
}

fn bf_getbuffer<T>() -> Option<ffi::getbufferproc>
where
    T: for<'p> PyBufferGetBufferProtocol<'p>,
{
    unsafe extern "C" fn wrap<T>(
        slf: *mut ffi::PyObject,
        arg1: *mut ffi::Py_buffer,
        arg2: c_int,
    ) -> c_int
    where
        T: for<'p> PyBufferGetBufferProtocol<'p>,
    {
        crate::callback_body!(py, {
            let slf = py.from_borrowed_ptr::<PyCell<T>>(slf);
            T::bf_getbuffer(slf.try_borrow_mut()?, arg1, arg2).convert(py)
        })
    }
    Some(wrap::<T>)
}

fn bf_releasebuffer<T>() -> Option<ffi::releasebufferproc>
where
    T: for<'p> PyBufferReleaseBufferProtocol<'p>,
{
    unsafe extern "C" fn wrap<T>(slf: *mut ffi::PyObject, arg1: *mut ffi::Py_buffer)
    where
        T: for<'p> PyBufferReleaseBufferProtocol<'p>,
    {
        crate::callback_body!(py, {
            let slf = py.from_borrowed_ptr::<crate::PyCell<T>>(slf);
            T::bf_releasebuffer(slf.try_borrow_mut()?, arg1).convert(py)
        })
    }
    Some(wrap::<T>)
}