Crate wasm_array_cp

wasm-array-cp

Directly using js-sys copy_from and copy_to to convert Js Array and Vec<T> is fragile.

There is a possibility that the memory will grow and the array buffer will be detached during copy.

So here we convert on the js side.

Usage

use js_sys::Uint8Array;
use wasm_array_cp::ArrayBufferCopy;

fn example() {
    let buf1 = vec![1, 2, 3, 4];
    let array: Uint8Array = ArrayBufferCopy::from_slice(&buf1);
    let buf2 = ArrayBufferCopy::to_vec(&array);
    assert_eq!(buf1, buf2);

    let mut buf3 = vec![0; 2];
    ArrayBufferCopy::copy_to(&array.subarray(0, 2), &mut buf3);
    assert_eq!(buf3, vec![1, 2]);

    let buf4 = Uint8Array::new_with_length(3);
    ArrayBufferCopy::copy_from(&buf4.subarray(1, 3), &buf3);
    assert!(buf4.get_index(0) == 0);
    assert!(buf4.get_index(1) == 1);
    assert!(buf4.get_index(2) == 2);
}

Traits

ArrayBufferCopy

Copy array buffer on the js side.