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#[derive(Debug)]
pub enum Error {
IOError(std::io::Error),
DownloadFailed,
AndroidAssetLoadingError,
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match *self {
_ => write!(f, "Error: {:?}", self),
}
}
}
impl From<std::io::Error> for Error {
fn from(e: std::io::Error) -> Error {
Error::IOError(e)
}
}
pub type Response = Result<Vec<u8>, Error>;
/// Filesystem path on desktops or HTTP URL in WASM
pub fn load_file<F: Fn(Response) + 'static>(path: &str, on_loaded: F) {
#[cfg(target_arch = "wasm32")]
wasm::load_file(path, on_loaded);
#[cfg(target_os = "android")]
load_file_android(path, on_loaded);
#[cfg(not(any(target_arch = "wasm32", target_os = "android")))]
load_file_desktop(path, on_loaded);
}
#[cfg(target_os = "android")]
fn load_file_android<F: Fn(Response)>(path: &str, on_loaded: F) {
fn load_file_sync(path: &str) -> Response {
let filename = std::ffi::CString::new(path).unwrap();
let mut data: sapp_android::android_asset = unsafe { std::mem::zeroed() };
unsafe { sapp_android::sapp_load_asset(filename.as_ptr(), &mut data as _) };
if data.content.is_null() == false {
let slice =
unsafe { std::slice::from_raw_parts(data.content, data.content_length as _) };
let response = slice.iter().map(|c| *c as _).collect::<Vec<_>>();
Ok(response)
} else {
Err(Error::AndroidAssetLoadingError)
}
}
let response = load_file_sync(path);
on_loaded(response);
}
#[cfg(target_arch = "wasm32")]
mod wasm {
use super::Response;
use std::cell::RefCell;
use std::collections::HashMap;
use std::thread_local;
thread_local! {
static FILES: RefCell<HashMap<u32, Box<dyn Fn(Response)>>> = RefCell::new(HashMap::new());
}
#[no_mangle]
pub extern "C" fn file_loaded(file_id: u32) {
use super::Error;
use sapp_wasm::fs;
FILES.with(|files| {
let mut files = files.borrow_mut();
let callback = files
.remove(&file_id)
.unwrap_or_else(|| panic!("Unknown file loaded!"));
let file_len = unsafe { fs::fs_get_buffer_size(file_id) };
if file_len == -1 {
callback(Err(Error::DownloadFailed));
} else {
let mut buffer = vec![0; file_len as usize];
unsafe { fs::fs_take_buffer(file_id, buffer.as_mut_ptr(), file_len as u32) };
callback(Ok(buffer));
}
})
}
pub fn load_file<F: Fn(Response) + 'static>(path: &str, on_loaded: F) {
use sapp_wasm::fs;
use std::ffi::CString;
let url = CString::new(path).unwrap();
let file_id = unsafe { fs::fs_load_file(url.as_ptr(), url.as_bytes().len() as u32) };
FILES.with(|files| {
let mut files = files.borrow_mut();
files.insert(file_id, Box::new(on_loaded));
});
}
}
#[cfg(not(any(target_arch = "wasm32", target_os = "android")))]
fn load_file_desktop<F: Fn(Response)>(path: &str, on_loaded: F) {
fn load_file_sync(path: &str) -> Response {
use std::fs::File;
use std::io::Read;
let mut response = vec![];
let mut file = File::open(path)?;
file.read_to_end(&mut response)?;
Ok(response)
}
let response = load_file_sync(path);
on_loaded(response);
}