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use std::io::Error; use std::path::Path; #[derive(Debug)] pub enum FileLoadError { Io(std::io::Error), Custom(String), } impl From<std::io::Error> for FileLoadError { fn from(e: Error) -> Self { Self::Io(e) } } #[cfg(target_arch = "wasm32")] impl From<wasm_bindgen::JsValue> for FileLoadError { fn from(value: wasm_bindgen::JsValue) -> Self { let string = match js_sys::JSON::stringify(&value) { Ok(string) => String::from(string), Err(_) => format!("{:?}", value), }; Self::Custom(string) } } pub async fn load_file<P: AsRef<Path>>(path: P) -> Result<Vec<u8>, FileLoadError> { #[cfg(not(target_arch = "wasm32"))] { use std::fs::File; use std::io::Read; let mut file = File::open(path)?; let mut buffer = Vec::new(); file.read_to_end(&mut buffer)?; Ok(buffer) } #[cfg(target_arch = "wasm32")] { use js_sys::Uint8Array; use wasm_bindgen::JsCast; use wasm_bindgen_futures::JsFuture; match web_sys::window() { Some(window) => { let resp_value = JsFuture::from(window.fetch_with_str(path.as_ref().to_str().unwrap())).await?; let resp: web_sys::Response = resp_value.dyn_into().unwrap(); let data = JsFuture::from(resp.array_buffer().unwrap()).await?; let bytes = Uint8Array::new(&data).to_vec(); Ok(bytes) } None => Err(FileLoadError::Custom("Window not found!".to_owned())), } } }