You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ffi.rs
    path of file: ./repos/orjson/src/str
    
    the code of the file until where you have to start completion: // SPDX-License-Identifier: (Apache-2.0 OR MIT)

use core::ffi::c_void;
use pyo3_ffi::*;

// see unicodeobject.h for documentation

#[inline]
pub fn hash_str(op: *mut PyObject) -> Py_hash_t {
    unsafe {
        let data_ptr: *mut c_
    
pub fn unicode_to_str_via_ffi(op: *mut PyObject) -> Option<&'static str> {
    let mut str_size: pyo3_ffi::Py_ssize_t = 0;
    let ptr = ffi!(PyUnicode_AsUTF8AndSize(op, &mut str_size)) as *const u8;
    if unlikely!(ptr.is_null()) {
        None
    } else {
        Some(str_from_slice!(ptr, str_size as usize))
    }
}