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// Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301, USA.
use std::u64;
use std::io::{Read, Seek, SeekFrom};
use std::fs::File;
use url::Url;
use error::*;
use rssource::*;
use buffer::*;
#[derive(Debug)]
enum StreamingState {
Stopped,
Started { file: File, position: u64 },
}
#[derive(Debug)]
pub struct FileSrc {
streaming_state: StreamingState,
}
impl FileSrc {
pub fn new() -> FileSrc {
FileSrc { streaming_state: StreamingState::Stopped }
}
pub fn new_boxed() -> Box<Source> {
Box::new(FileSrc::new())
}
}
fn validate_uri(uri: &Url) -> Result<(), UriError> {
let _ = try!(uri.to_file_path()
.or_else(|_| {
Err(UriError::new(UriErrorKind::UnsupportedProtocol,
Some(format!("Unsupported file URI '{}'", uri.as_str()))))
}));
Ok(())
}
impl Source for FileSrc {
fn uri_validator(&self) -> Box<UriValidator> {
Box::new(validate_uri)
}
fn is_seekable(&self) -> bool {
true
}
fn get_size(&self) -> Option<u64> {
if let StreamingState::Started { ref file, .. } = self.streaming_state {
file.metadata()
.ok()
.map(|m| m.len())
} else {
None
}
}
fn start(&mut self, uri: Url) -> Result<(), ErrorMessage> {
if let StreamingState::Started { .. } = self.streaming_state {
return Err(error_msg!(SourceError::Failure, ["Source already started"]));
}
let location = try!(uri.to_file_path()
.or_else(|_| {
Err(error_msg!(SourceError::Failure,
["Unsupported file URI '{}'", uri.as_str()]))
}));
let file = try!(File::open(location.as_path()).or_else(|err| {
Err(error_msg!(SourceError::OpenFailed,
["Could not open file for reading '{}': {}",
location.to_str().unwrap_or("Non-UTF8 path"),
err.to_string()]))
}));
self.streaming_state = StreamingState::Started {
file: file,
position: 0,
};
Ok(())
}
fn stop(&mut self) -> Result<(), ErrorMessage> {
self.streaming_state = StreamingState::Stopped;
Ok(())
}
fn fill(&mut self, offset: u64, _: u32, buffer: &mut Buffer) -> Result<(), FlowError> {
let (file, position) = match self.streaming_state {
StreamingState::Started { ref mut file, ref mut position } => (file, position),
StreamingState::Stopped => {
return Err(FlowError::Error(error_msg!(SourceError::Failure, ["Not started yet"])));
}
};
if *position != offset {
try!(file.seek(SeekFrom::Start(offset)).or_else(|err| {
Err(FlowError::Error(error_msg!(SourceError::SeekFailed,
["Failed to seek to {}: {}",
offset,
err.to_string()])))
}));
*position = offset;
}
let size = {
let mut map = match buffer.map_readwrite() {
None => {
return Err(FlowError::Error(error_msg!(SourceError::Failure,
["Failed to map buffer"])));
}
Some(map) => map,
};
let data = map.as_mut_slice();
try!(file.read(data).or_else(|err| {
Err(FlowError::Error(error_msg!(SourceError::ReadFailed,
["Failed to read at {}: {}",
offset,
err.to_string()])))
}))
};
*position += size as u64;
if let Err(err) = buffer.set_size(size) {
return Err(FlowError::Error(error_msg!(SourceError::Failure,
["Failed to resize buffer: {}", err])));
}
Ok(())
}
fn seek(&mut self, _: u64, _: Option<u64>) -> Result<(), ErrorMessage> {
Ok(())
}
}
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