80 lines
2.1 KiB
Rust
80 lines
2.1 KiB
Rust
#![allow(dead_code, unused_variables)]
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#![feature(proc_macro, specialization)]
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#[macro_use] extern crate pyo3;
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use std::ptr;
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use std::os::raw::{c_int, c_void};
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use pyo3::*;
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#[py::class]
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struct TestClass {
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vec: Vec<u8>,
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}
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#[py::proto]
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impl class::PyBufferProtocol for TestClass {
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fn bf_getbuffer(&self, py: Python, view: *mut ffi::Py_buffer, flags: c_int) -> PyResult<()> {
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if view == ptr::null_mut() {
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return Err(PyErr::new::<exc::BufferError, _>(py, "View is null"))
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}
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unsafe {
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(*view).obj = ptr::null_mut();
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}
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if (flags & ffi::PyBUF_WRITABLE) == ffi::PyBUF_WRITABLE {
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return Err(PyErr::new::<exc::BufferError, _>(py, "Object is not writable"))
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}
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let bytes = self.vec(py);
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unsafe {
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(*view).buf = bytes.as_ptr() as *mut c_void;
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(*view).len = bytes.len() as isize;
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(*view).readonly = 1;
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(*view).itemsize = 1;
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(*view).format = ptr::null_mut();
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if (flags & ffi::PyBUF_FORMAT) == ffi::PyBUF_FORMAT {
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let msg = ::std::ffi::CStr::from_ptr("B\0".as_ptr() as *const _);
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(*view).format = msg.as_ptr() as *mut _;
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}
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(*view).ndim = 1;
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(*view).shape = ptr::null_mut();
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if (flags & ffi::PyBUF_ND) == ffi::PyBUF_ND {
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(*view).shape = (&((*view).len)) as *const _ as *mut _;
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}
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(*view).strides = ptr::null_mut();
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if (flags & ffi::PyBUF_STRIDES) == ffi::PyBUF_STRIDES {
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(*view).strides = &((*view).itemsize) as *const _ as *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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}
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Ok(())
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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 gil = Python::acquire_gil();
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let py = gil.python();
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let t = TestClass::create_instance(py, vec![b' ', b'2', b'3']).unwrap();
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let d = PyDict::new(py);
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let _ = d.set_item(py, "ob", t);
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py.run("assert bytes(ob) == b' 23'", None, Some(&d)).unwrap();
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}
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