132 lines
3.5 KiB
Rust
132 lines
3.5 KiB
Rust
use pyo3::buffer::PyBuffer;
|
|
use pyo3::class::PyBufferProtocol;
|
|
use pyo3::exceptions::BufferError;
|
|
use pyo3::ffi;
|
|
use pyo3::prelude::*;
|
|
use pyo3::types::IntoPyDict;
|
|
use pyo3::AsPyPointer;
|
|
use std::ffi::CStr;
|
|
use std::os::raw::{c_int, c_void};
|
|
use std::ptr;
|
|
use std::sync::atomic::{AtomicBool, Ordering};
|
|
use std::sync::Arc;
|
|
|
|
#[pyclass]
|
|
struct TestBufferClass {
|
|
vec: Vec<u8>,
|
|
drop_called: Arc<AtomicBool>,
|
|
}
|
|
|
|
#[pyproto]
|
|
impl PyBufferProtocol for TestBufferClass {
|
|
fn bf_getbuffer(slf: PyRefMut<Self>, view: *mut ffi::Py_buffer, flags: c_int) -> PyResult<()> {
|
|
if view.is_null() {
|
|
return Err(BufferError::py_err("View is null"));
|
|
}
|
|
|
|
if (flags & ffi::PyBUF_WRITABLE) == ffi::PyBUF_WRITABLE {
|
|
return Err(BufferError::py_err("Object is not writable"));
|
|
}
|
|
|
|
unsafe {
|
|
(*view).obj = slf.as_ptr();
|
|
ffi::Py_INCREF((*view).obj);
|
|
}
|
|
|
|
let bytes = &slf.vec;
|
|
|
|
unsafe {
|
|
(*view).buf = bytes.as_ptr() as *mut c_void;
|
|
(*view).len = bytes.len() as isize;
|
|
(*view).readonly = 1;
|
|
(*view).itemsize = 1;
|
|
|
|
(*view).format = ptr::null_mut();
|
|
if (flags & ffi::PyBUF_FORMAT) == ffi::PyBUF_FORMAT {
|
|
let msg = CStr::from_bytes_with_nul(b"B\0").unwrap();
|
|
(*view).format = msg.as_ptr() as *mut _;
|
|
}
|
|
|
|
(*view).ndim = 1;
|
|
(*view).shape = ptr::null_mut();
|
|
if (flags & ffi::PyBUF_ND) == ffi::PyBUF_ND {
|
|
(*view).shape = (&((*view).len)) as *const _ as *mut _;
|
|
}
|
|
|
|
(*view).strides = ptr::null_mut();
|
|
if (flags & ffi::PyBUF_STRIDES) == ffi::PyBUF_STRIDES {
|
|
(*view).strides = &((*view).itemsize) as *const _ as *mut _;
|
|
}
|
|
|
|
(*view).suboffsets = ptr::null_mut();
|
|
(*view).internal = ptr::null_mut();
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn bf_releasebuffer(_slf: PyRefMut<Self>, _view: *mut ffi::Py_buffer) -> PyResult<()> {
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl Drop for TestBufferClass {
|
|
fn drop(&mut self) {
|
|
print!("dropped");
|
|
self.drop_called.store(true, Ordering::Relaxed);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_buffer() {
|
|
let drop_called = Arc::new(AtomicBool::new(false));
|
|
|
|
{
|
|
let gil = Python::acquire_gil();
|
|
let py = gil.python();
|
|
let instance = Py::new(
|
|
py,
|
|
TestBufferClass {
|
|
vec: vec![b' ', b'2', b'3'],
|
|
drop_called: drop_called.clone(),
|
|
},
|
|
)
|
|
.unwrap();
|
|
let env = [("ob", instance)].into_py_dict(py);
|
|
py.run("assert bytes(ob) == b' 23'", None, Some(env))
|
|
.unwrap();
|
|
}
|
|
|
|
assert!(drop_called.load(Ordering::Relaxed));
|
|
}
|
|
|
|
#[test]
|
|
fn test_buffer_referenced() {
|
|
let drop_called = Arc::new(AtomicBool::new(false));
|
|
|
|
let buf = {
|
|
let input = vec![b' ', b'2', b'3'];
|
|
let gil = Python::acquire_gil();
|
|
let py = gil.python();
|
|
let instance: PyObject = TestBufferClass {
|
|
vec: input.clone(),
|
|
drop_called: drop_called.clone(),
|
|
}
|
|
.into_py(py);
|
|
|
|
let buf = PyBuffer::get(py, instance.as_ref(py)).unwrap();
|
|
assert_eq!(buf.to_vec::<u8>(py).unwrap(), input);
|
|
drop(instance);
|
|
buf
|
|
};
|
|
|
|
assert!(!drop_called.load(Ordering::Relaxed));
|
|
|
|
{
|
|
let _py = Python::acquire_gil().python();
|
|
drop(buf);
|
|
}
|
|
|
|
assert!(drop_called.load(Ordering::Relaxed));
|
|
}
|