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use std::mem;
use std::os::raw::c_void;
use std::vec::Vec;
use crate::errors::{Error, NullPointer};
#[repr(C)]
pub struct Slice {
pub offset: u32,
pub len: u32,
}
pub fn alloc(size: usize) -> *mut c_void {
let buffer = vec![0u8; size];
release_buffer(buffer)
}
pub fn release_buffer(buffer: Vec<u8>) -> *mut c_void {
let slice = build_slice(&buffer);
mem::forget(buffer);
Box::into_raw(slice) as *mut c_void
}
pub unsafe fn consume_slice(ptr: *mut c_void) -> Result<Vec<u8>, Error> {
if ptr.is_null() {
return NullPointer {}.fail();
}
let slice = Box::from_raw(ptr as *mut Slice);
let buffer = Vec::from_raw_parts(
slice.offset as *mut u8,
slice.len as usize,
slice.len as usize,
);
Ok(buffer)
}
pub fn build_slice(data: &[u8]) -> Box<Slice> {
Box::new(Slice {
offset: data.as_ptr() as u32,
len: data.len() as u32,
})
}