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alemi
2024-07-26 15:02![glitchy picture by me](/img/banded-noise.png)
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do you want to see how funny it is to deal with strings in wasm??
use std::ffi::{c_char, CString};
// global static muts because i want to watch the world burn
static mut IN: Option<Vec<u8>> = None;
static mut OUT: Option<CString> = None;
static mut SIZE: usize = 0;
#[no_mangle]
pub extern "C" fn encode() -> i32 {
let Some(input) = get_string() else { return 0 };
let out = aecode::encode(input.as_bytes());
if set_string(&out) { 1 } else { 42 }
}
#[no_mangle]
pub extern "C" fn decode() -> i32 {
let Some(input) = get_string() else { return 0 };
let out = aecode::decode(input);
let Ok(out_txt) = std::str::from_utf8(&out) else { return 999 };
if set_string(out_txt) { 1 } else { 42 }
}
fn get_string() -> Option<&'static str> { // yeahh sure static...
let txt = unsafe { IN.as_ref()? };
let mut parsed = std::str::from_utf8(txt).ok()?;
// get rid of trailing null byte because CString doesnt like it
if parsed.ends_with('\0') {
parsed = &parsed[..parsed.len()-1];
}
Some(parsed)
}
fn set_string(txt: &str) -> bool {
let Ok(new) = CString::new(txt) else { return false };
unsafe { SIZE = new.as_bytes().len() };
if let Some(old) = unsafe { OUT.replace(new) } {
drop(old);
}
true
}
#[no_mangle]
pub extern "C" fn ptr() -> *const c_char {
match unsafe { OUT.as_ref() } {
Some(cstr) => cstr.as_ptr(),
None => std::ptr::null(),
}
}
#[no_mangle]
pub extern "C" fn size() -> usize {
unsafe { SIZE }
}
#[no_mangle]
pub extern "C" fn alloc(size: usize) -> *const u8 {
let buffer = vec![0; size];
let addr = buffer.as_ptr();
if let Some(old) = unsafe { IN.replace(buffer) } {
drop(old);
}
addr
}
let aecode = null;
fetch("https://cdn.alemi.dev/web/aecode.wasm")
.then((response) => response.arrayBuffer())
.then((bytes) => WebAssembly.instantiate(bytes))
.then((results) => {
aecode = results.instance;
});
function into_wasm_string(txt) {
const encoder = new TextEncoder();
const bytes = encoder.encode(txt);
const ptr = aecode.exports.alloc(bytes.byteLength + 1);
const buffer = new Uint8Array(aecode.exports.memory.buffer, ptr, bytes.byteLength + 1);
buffer.set(bytes);
}
function from_wasm_string(offset, length) {
const buffer = new Uint8Array(aecode.exports.memory.buffer, offset, length);
const dec = new TextDecoder();
return dec.decode(buffer);
}
function doit() {
let input = document.getElementById("input").value;
into_wasm_string(input);
let res = aecode.exports.decode();
let output = from_wasm_string(aecode.exports.ptr(), aecode.exports.size());
document.getElementById("output").innerHTML = output;
}