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#![cfg(feature = "macros")]
#![cfg(any(not(Py_LIMITED_API), Py_3_11))]
#![warn(unsafe_op_in_unsafe_fn)]
use pyo3::{buffer::PyBuffer, exceptions::PyBufferError, ffi, prelude::*};
use std::{
os::raw::{c_int, c_void},
ptr,
};
#[macro_use]
mod test_utils;
enum TestGetBufferError {
NullShape,
NullStrides,
IncorrectItemSize,
IncorrectFormat,
IncorrectAlignment,
}
#[pyclass]
struct TestBufferErrors {
buf: Vec<u32>,
error: Option<TestGetBufferError>,
}
#[pymethods]
impl TestBufferErrors {
unsafe fn __getbuffer__(
slf: PyRefMut<'_, Self>,
view: *mut ffi::Py_buffer,
flags: c_int,
) -> PyResult<()> {
if view.is_null() {
return Err(PyBufferError::new_err("View is null"));
}
if (flags & ffi::PyBUF_WRITABLE) == ffi::PyBUF_WRITABLE {
return Err(PyBufferError::new_err("Object is not writable"));
}
let bytes = &slf.buf;
unsafe {
(*view).buf = bytes.as_ptr() as *mut c_void;
(*view).len = bytes.len() as isize;
(*view).readonly = 1;
(*view).itemsize = std::mem::size_of::<u32>() as isize;
let msg = ffi::c_str!("I");
(*view).format = msg.as_ptr() as *mut _;
(*view).ndim = 1;
(*view).shape = &mut (*view).len;
(*view).strides = &mut (*view).itemsize;
(*view).suboffsets = ptr::null_mut();
(*view).internal = ptr::null_mut();
if let Some(err) = &slf.error {
use TestGetBufferError::*;
match err {
NullShape => {
(*view).shape = std::ptr::null_mut();
}
NullStrides => {
(*view).strides = std::ptr::null_mut();
}
IncorrectItemSize => {
(*view).itemsize += 1;
}
IncorrectFormat => {
(*view).format = ffi::c_str!("B").as_ptr() as _;
}
IncorrectAlignment => (*view).buf = (*view).buf.add(1),
}
}
(*view).obj = slf.into_ptr();
}
Ok(())
}
}
#[test]
fn test_get_buffer_errors() {
Python::attach(|py| {
let instance = Py::new(
py,
TestBufferErrors {
buf: vec![0, 1, 2, 3],
error: None,
},
)
.unwrap();
assert!(PyBuffer::<u32>::get(instance.bind(py)).is_ok());
instance.borrow_mut(py).error = Some(TestGetBufferError::NullShape);
assert_eq!(
PyBuffer::<u32>::get(instance.bind(py))
.unwrap_err()
.to_string(),
"BufferError: shape is null"
);
instance.borrow_mut(py).error = Some(TestGetBufferError::NullStrides);
assert_eq!(
PyBuffer::<u32>::get(instance.bind(py))
.unwrap_err()
.to_string(),
"BufferError: strides is null"
);
instance.borrow_mut(py).error = Some(TestGetBufferError::IncorrectItemSize);
assert_eq!(
PyBuffer::<u32>::get(instance.bind(py))
.unwrap_err()
.to_string(),
"BufferError: buffer contents are not compatible with u32"
);
instance.borrow_mut(py).error = Some(TestGetBufferError::IncorrectFormat);
assert_eq!(
PyBuffer::<u32>::get(instance.bind(py))
.unwrap_err()
.to_string(),
"BufferError: buffer contents are not compatible with u32"
);
instance.borrow_mut(py).error = Some(TestGetBufferError::IncorrectAlignment);
assert_eq!(
PyBuffer::<u32>::get(instance.bind(py))
.unwrap_err()
.to_string(),
"BufferError: buffer contents are insufficiently aligned for u32"
);
});
}
|
