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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 about_loader;
use mime_classifier::MIMEClassifier;
use mime_guess::guess_mime_type;
use net_traits::ProgressMsg::{Done, Payload};
use net_traits::{LoadConsumer, LoadData, Metadata};
use resource_task::{CancellationListener, ProgressSender};
use resource_task::{send_error, start_sending_sniffed, start_sending_sniffed_opt};
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 url::Url;
use util::task::spawn_named;
static READ_SIZE: usize = 8192;
enum ReadStatus {
Partial(Vec<u8>),
EOF,
}
enum LoadResult {
Cancelled,
Finished,
}
fn read_block(reader: &mut File) -> Result<ReadStatus, String> {
let mut buf = vec![0; READ_SIZE];
match reader.read(&mut buf) {
Ok(0) => Ok(ReadStatus::EOF),
Ok(n) => {
buf.truncate(n);
Ok(ReadStatus::Partial(buf))
}
Err(e) => Err(e.description().to_owned()),
}
}
fn read_all(reader: &mut File, progress_chan: &ProgressSender, cancel_listener: &CancellationListener)
-> Result<LoadResult, String> {
loop {
if cancel_listener.is_cancelled() {
return Ok(LoadResult::Cancelled);
}
match try!(read_block(reader)) {
ReadStatus::Partial(buf) => progress_chan.send(Payload(buf)).unwrap(),
ReadStatus::EOF => return Ok(LoadResult::Finished),
}
}
}
pub fn factory(load_data: LoadData,
senders: LoadConsumer,
classifier: Arc<MIMEClassifier>,
cancel_listener: CancellationListener) {
let url = load_data.url;
let context = load_data.context;
assert!(&*url.scheme == "file");
spawn_named("file_loader".to_owned(), move || {
let file_path: Result<PathBuf, ()> = url.to_file_path();
match file_path {
Ok(file_path) => {
match File::open(&file_path) {
Ok(ref mut reader) => {
if cancel_listener.is_cancelled() {
return;
}
match read_block(reader) {
Ok(ReadStatus::Partial(buf)) => {
let mut metadata = Metadata::default(url);
let mime_type = guess_mime_type(file_path.as_path());
metadata.set_content_type(Some(&mime_type));
let progress_chan = start_sending_sniffed(senders, metadata,
classifier, &buf, context);
progress_chan.send(Payload(buf)).unwrap();
let read_result = read_all(reader, &progress_chan, &cancel_listener);
if let Ok(load_result) = read_result {
match load_result {
LoadResult::Cancelled => return,
LoadResult::Finished => progress_chan.send(Done(Ok(()))).unwrap(),
}
}
}
Ok(ReadStatus::EOF) => {
let mut metadata = Metadata::default(url);
let mime_type = guess_mime_type(file_path.as_path());
metadata.set_content_type(Some(&mime_type));
if let Ok(chan) = start_sending_sniffed_opt(senders,
metadata,
classifier,
&[],
context) {
let _ = chan.send(Done(Ok(())));
}
}
Err(e) => {
send_error(url, e, senders);
}
};
}
Err(_) => {
// this should be one of the three errors listed in
// http://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.open
// but, we'll go for a "file not found!"
let url = Url::parse("about:not-found").unwrap();
let load_data_404 = LoadData::new(context, url, None);
about_loader::factory(load_data_404, senders, classifier, cancel_listener)
}
}
}
Err(_) => {
send_error(url, "Could not parse path".to_owned(), senders);
}
}
});
}
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