135 lines
3.3 KiB
Rust
135 lines
3.3 KiB
Rust
#![cfg(feature = "macros")]
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#![cfg(any(not(Py_LIMITED_API), Py_3_11))]
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use pyo3::buffer::PyBuffer;
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use pyo3::exceptions::PyBufferError;
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use pyo3::ffi;
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use pyo3::prelude::*;
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use pyo3::types::IntoPyDict;
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use pyo3::AsPyPointer;
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use std::ffi::CString;
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use std::os::raw::{c_int, c_void};
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use std::ptr;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::Arc;
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mod common;
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#[pyclass]
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struct TestBufferClass {
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vec: Vec<u8>,
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drop_called: Arc<AtomicBool>,
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}
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#[pymethods]
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impl TestBufferClass {
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unsafe fn __getbuffer__(
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mut slf: PyRefMut<'_, Self>,
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view: *mut ffi::Py_buffer,
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flags: c_int,
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) -> PyResult<()> {
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if view.is_null() {
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return Err(PyBufferError::new_err("View is null"));
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}
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if (flags & ffi::PyBUF_WRITABLE) == ffi::PyBUF_WRITABLE {
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return Err(PyBufferError::new_err("Object is not writable"));
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}
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(*view).obj = ffi::_Py_NewRef(slf.as_ptr());
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(*view).buf = slf.vec.as_mut_ptr() as *mut c_void;
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(*view).len = slf.vec.len() as isize;
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(*view).readonly = 1;
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(*view).itemsize = 1;
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(*view).format = if (flags & ffi::PyBUF_FORMAT) == ffi::PyBUF_FORMAT {
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let msg = CString::new("B").unwrap();
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msg.into_raw()
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} else {
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ptr::null_mut()
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};
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(*view).ndim = 1;
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(*view).shape = if (flags & ffi::PyBUF_ND) == ffi::PyBUF_ND {
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&mut (*view).len
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} else {
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ptr::null_mut()
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};
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(*view).strides = if (flags & ffi::PyBUF_STRIDES) == ffi::PyBUF_STRIDES {
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&mut (*view).itemsize
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} else {
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ptr::null_mut()
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};
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(*view).suboffsets = ptr::null_mut();
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(*view).internal = ptr::null_mut();
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Ok(())
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}
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unsafe fn __releasebuffer__(&self, view: *mut ffi::Py_buffer) {
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// Release memory held by the format string
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drop(CString::from_raw((*view).format));
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}
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}
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impl Drop for TestBufferClass {
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fn drop(&mut self) {
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print!("dropped");
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self.drop_called.store(true, Ordering::Relaxed);
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}
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}
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#[test]
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fn test_buffer() {
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let drop_called = Arc::new(AtomicBool::new(false));
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{
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Python::with_gil(|py| {
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let instance = Py::new(
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py,
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TestBufferClass {
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vec: vec![b' ', b'2', b'3'],
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drop_called: drop_called.clone(),
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},
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)
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.unwrap();
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let env = [("ob", instance)].into_py_dict(py);
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py_assert!(py, *env, "bytes(ob) == b' 23'");
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});
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}
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assert!(drop_called.load(Ordering::Relaxed));
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}
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#[test]
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fn test_buffer_referenced() {
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let drop_called = Arc::new(AtomicBool::new(false));
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let buf = {
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let input = vec![b' ', b'2', b'3'];
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Python::with_gil(|py| {
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let instance: PyObject = TestBufferClass {
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vec: input.clone(),
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drop_called: drop_called.clone(),
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}
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.into_py(py);
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let buf = PyBuffer::<u8>::get(instance.as_ref(py)).unwrap();
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assert_eq!(buf.to_vec(py).unwrap(), input);
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drop(instance);
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buf
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})
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};
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assert!(!drop_called.load(Ordering::Relaxed));
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Python::with_gil(|_| {
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drop(buf);
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});
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assert!(drop_called.load(Ordering::Relaxed));
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}
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