INNER CODE UNIT · Rust

write_to_guest_vec

lunatic-solutions/lunatic · crates/lunatic-common-api/src/lib.rs:60

pub async fn write_to_guest_vec<T: Send>(
    caller: &mut Caller<'_, T>,
    memory: &Memory,
    data: &[u8],
    len_ptr: u32,
) -> Result<u32> {
    let alloc_len = data.len();
    let alloc_ptr = allocate_guest_memory(caller, alloc_len as u32).await?;

    let (memory_slice, _) = memory.data_and_store_mut(&mut (*caller));
    let mut alloc_vec = memory_slice
        .get_mut(alloc_ptr as usize..(alloc_ptr as usize + alloc_len))
        .context("allocated memory does not exist")?;

    alloc_vec.write_all(data)?;

    memory.write(caller, len_ptr as usize, &alloc_len.to_le_bytes())?;

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