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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use mime_classifier::MIMEClassifier;
use net_traits::ProgressMsg::{Payload, Done};
use net_traits::{LoadData, Metadata, LoadConsumer};
use resource_task::{start_sending, start_sending_sniffed, ProgressSender};
use std::borrow::ToOwned;
use std::error::Error;
use std::fs::File;
use std::io::Read;
use std::path::PathBuf;
use std::sync::Arc;
use util::task::spawn_named;
static READ_SIZE: usize = 8192;
enum ReadStatus {
Partial(Vec<u8>),
EOF,
}
fn read_block(reader: &mut File) -> Result<ReadStatus, String> {
let mut buf = vec![0; READ_SIZE];
match reader.read(&mut buf) {
Ok(0) => return Ok(ReadStatus::EOF),
Ok(n) => {
buf.truncate(n);
Ok(ReadStatus::Partial(buf))
}
Err(e) => Err(e.description().to_string()),
}
}
fn read_all(reader: &mut File, progress_chan: &ProgressSender)
-> Result<(), String> {
loop {
match try!(read_block(reader)) {
ReadStatus::Partial(buf) => progress_chan.send(Payload(buf)).unwrap(),
ReadStatus::EOF => return Ok(()),
}
}
}
pub fn factory(load_data: LoadData, senders: LoadConsumer, classifier: Arc<MIMEClassifier>) {
let url = load_data.url;
assert!(&*url.scheme == "file");
spawn_named("file_loader".to_owned(), move || {
let metadata = Metadata::default(url.clone());
let file_path: Result<PathBuf, ()> = url.to_file_path();
match file_path {
Ok(file_path) => {
match File::open(&file_path) {
Ok(ref mut reader) => {
let res = read_block(reader);
let (res, progress_chan) = match res {
Ok(ReadStatus::Partial(buf)) => {
let progress_chan = start_sending_sniffed(senders, metadata,
classifier, &buf);
progress_chan.send(Payload(buf)).unwrap();
(read_all(reader, &progress_chan), progress_chan)
}
Ok(ReadStatus::EOF) | Err(_) =>
(res.map(|_| ()), start_sending(senders, metadata)),
};
progress_chan.send(Done(res)).unwrap();
}
Err(e) => {
let progress_chan = start_sending(senders, metadata);
progress_chan.send(Done(Err(e.description().to_string()))).unwrap();
}
}
}
Err(_) => {
let progress_chan = start_sending(senders, metadata);
progress_chan.send(Done(Err(url.to_string()))).unwrap();
}
}
});
}
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