Is it possible to use this as a WASM module?

[DavidPHH]

Other issues here mentioning wasm and the fact that I'm able to build a project using this via wasm-pack --target web made me think it's possible, but my lack of success and #15 being open made me ask this question to make sure.

I'm new to rust and haven't been having an easy time debugging or finding more info, so if it is possible to do this I'd appreciate any pointers on what to try.

cargo.toml

[package]
name = "test-lzma-wasm"
version = "0.1.0"
edition = "2021"

[dependencies]
console_error_panic_hook = "0.1.7"
liblzma = { version = "0.3", features = ["static"] }
wasm-bindgen = "0.2"

[lib]
crate-type = ["cdylib"]

lib.rs (example copied from the docs)

use wasm_bindgen::prelude::*;
extern crate console_error_panic_hook;
use liblzma::read::{XzDecoder, XzEncoder};
use std::io::prelude::*;

#[wasm_bindgen]
pub fn example() -> String {
    console_error_panic_hook::set_once();
    let data = "Hello, World!".as_bytes();
    let compressor = XzEncoder::new(data, 9); // ""Narrowed"" down the error to this line.
    let mut decompressor = XzDecoder::new(compressor);

    let mut contents = String::new();
    decompressor.read_to_string(&mut contents).unwrap();
    return contents;
}

index.ts I'm able to run other functions, like a simple hello world one, but if the XzEncoder::new() line is uncommented this errors.
I tried in node and also as a <script> in a html file.

import init, { example } from "./test-lzma-wasm/pkg";

await init();

example();

This is the error I get:

panicked at /rust/deps/dlmalloc-0.2.6/src/dlmalloc.rs:1198:13:
assertion failed: psize <= size + max_overhead

Stack:

Error
    at <anonymous> (/home/david/Projects/test/test-lzma-wasm/pkg/test_lzma_wasm.js:169:21)
    at <?>.wasm-function[253] (native)
    at <?>.wasm-function[88] (native)
    at <?>.wasm-function[146] (native)
    at <?>.wasm-function[140] (native)
    at <?>.wasm-function[228] (native)
    at <?>.wasm-function[203] (native)
    at <?>.wasm-function[163] (native)
    at <?>.wasm-function[125] (native)
    at <?>.wasm-function[20] (native)


RuntimeError: Unreachable code should not be executed (evaluating 'wasm.example(retptr)')

[ChanTsune]

Hi @DavidPHH

This issue may help you.
drager/wasm-pack#1389

[DavidPHH]

That was it! Thank you very much