Neon: Any helper for u32 to u8?

[galvez]

Trying to export a sha256 function to JavaScript.

I took some code from #401 but am stuck attempting to pass a u8 vector to input().

extern crate neon;
extern crate hex;
extern crate sha2;

use neon::prelude::*;
use sha2::{Sha256, Digest};

fn sha256hex(mut cx: FunctionContext) -> JsResult<JsString> {
    let buf: Handle<JsBuffer> = cx.argument(0)?;
    let result: str = {
        let guard = cx.lock();
        let data = buf.borrow(&guard);
        let mut hasher = Sha256::new();
        hasher.input(data.as_slice::<u32>());
        hex::encode(hasher.result().as_string());
    };
    Ok(cx.string(result))
}

register_module!(mut ctx, {
    ctx.export_function("sha256hex", sha256hex)
});

cc @kjvalencik if you have 2 minutes and are feeling generous today :)

[passcod]

The Rust stdlib has helpers for this: https://doc.rust-lang.org/std/primitive.u64.html#method.to_ne_bytes

[jeffvandyke]

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