add PyBytes wrapper type to access bytes from python

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "anybytes"
-version = "0.10.0"
+version = "0.11.0-alpha.1"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/triblespace/anybytes"

src/lib.rs

@@ -14,6 +14,9 @@ mod owners;
 #[cfg(feature = "zerocopy")]
 pub mod packed;
 
+#[cfg(feature = "pyo3")]
+pub mod pybytes;
+
 #[cfg(test)]
 mod tests;
 
@@ -26,3 +29,5 @@ pub use crate::packed::Packed;
 pub use crate::packed::PackedSlice;
 #[cfg(feature = "zerocopy")]
 pub use crate::packed::PackedStr;
+#[cfg(feature = "pyo3")]
+pub use crate::pybytes::PyBytes;

src/pybytes.rs

@@ -0,0 +1,32 @@
+use pyo3::{prelude::*, ffi, PyResult};
+use std::os::raw::c_int;
+
+use crate::Bytes;
+
+#[pyclass(name = "Bytes")]
+pub struct PyBytes {
+    bytes: Bytes
+}
+
+#[pymethods]
+impl PyBytes {
+    unsafe fn __getbuffer__(
+        slf: PyRefMut<Self>,
+        view: *mut ffi::Py_buffer,
+        flags: c_int,
+    ) -> PyResult<()> {
+        let bytes = slf.bytes.as_slice();
+        let ret = ffi::PyBuffer_FillInfo(
+            view,
+            slf.as_ptr() as *mut _,
+            bytes.as_ptr() as *mut _,
+            bytes.len().try_into().unwrap(),
+            1, // read only
+            flags,
+        );
+        if ret == -1 {
+            return Err(PyErr::fetch(slf.py()));
+        }
+        Ok(())
+    }
+}