AppFlowy/rust-lib/dart-ffi/src/c.rs

use byteorder::{BigEndian, ByteOrder};
use std::mem::forget;

pub fn forget_rust(buf: Vec<u8>) -> *const u8 {
    let ptr = buf.as_ptr();
    forget(buf);
    ptr
}

#[allow(unused_attributes)]
#[allow(dead_code)]
pub fn reclaim_rust(ptr: *mut u8, length: u32) {
    unsafe {
        let len: usize = length as usize;
        Vec::from_raw_parts(ptr, len, len);
    }
}

pub fn extend_front_four_bytes_into_bytes(bytes: &[u8]) -> Vec<u8> {
    let mut output = Vec::with_capacity(bytes.len() + 4);
    let mut marker_bytes = [0; 4];
    BigEndian::write_u32(&mut marker_bytes, bytes.len() as u32);
    output.extend_from_slice(&marker_bytes);
    output.extend_from_slice(bytes);
    output
}