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extern crate phf;
#[cfg(feature = "flate2")]
extern crate flate2;
use std::borrow::{Borrow, Cow};
use std::io::{self, BufReader, Cursor, Error, ErrorKind, Read};
use std::fs::File;
#[cfg(feature = "flate2")]
use flate2::FlateReadExt;
pub enum Compression {
None,
Gzip,
Passthrough,
}
/// Runtime access to the included files
pub struct Files {
/// **Do not access this field, it is only public to allow for code generation!**
pub files: phf::Map<&'static str, (Compression, &'static [u8])>,
}
#[cfg(windows)]
fn as_key(path: &str) -> Cow<str> {
Cow::Owned(path.replace("\\", "/"))
}
#[cfg(not(windows))]
fn as_key(path: &str) -> Cow<str> {
Cow::Borrowed(path)
}
impl Files {
pub fn available(&self, path: &str) -> bool {
self.files.contains_key(path)
}
/// Returns an iterator over all available file names. Does not
/// decompress any compressed data.
pub fn file_names(&self) -> FileNames {
FileNames { iter: self.files.keys() }
}
pub fn get(&self, path: &str) -> io::Result<Cow<'static, [u8]>> {
let key = as_key(path);
match self.files.get(key.borrow() as &str) {
Some(b) => {
match b.0 {
Compression::None => Ok(Cow::Borrowed(b.1)),
#[cfg(feature = "flate2")]
Compression::Gzip => {
let mut r = try!(Cursor::new(b.1).gz_decode());
let mut v = Vec::new();
try!(r.read_to_end(&mut v));
Ok(Cow::Owned(v))
}
#[cfg(not(feature = "flate2"))]
Compression::Gzip => panic!("Feature 'flate2' not enabled"),
Compression::Passthrough => {
let mut r = BufReader::new(try!(File::open(path)));
let mut v = Vec::new();
try!(r.read_to_end(&mut v));
Ok(Cow::Owned(v))
}
}
}
None => Err(Error::new(ErrorKind::NotFound, "Key not found")),
}
}
pub fn read(&self, path: &str) -> io::Result<Box<Read>> {
let key = as_key(path);
match self.files.get(key.borrow() as &str) {
Some(b) => {
match b.0 {
Compression::None => Ok(Box::new(Cursor::new(b.1))),
#[cfg(feature = "flate2")]
Compression::Gzip => Ok(Box::new(try!(Cursor::new(b.1).gz_decode()))),
#[cfg(not(feature = "flate2"))]
Compression::Gzip => panic!("Feature 'flate2' not enabled"),
Compression::Passthrough => {
Ok(Box::new(BufReader::new(try!(File::open(path)))))
}
}
}
None => Err(Error::new(ErrorKind::NotFound, "Key not found")),
}
}
}
/// Iterates over the file names available for `Files` object.
pub struct FileNames<'a> {
/// Our internal iterator. We wrap this in a nice struct so our
/// caller doesn't need to know the details.
iter: phf::map::Keys<'a, &'static str, (Compression, &'static [u8])>,
}
impl<'a> Iterator for FileNames<'a> {
type Item = &'static str;
fn next(&mut self) -> Option<Self::Item> {
self.iter.next().map(|s| *s)
}
}
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