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use std::path::{Path, PathBuf};
use std::io::{self, Write, Read, Seek, SeekFrom};
use std::fs::{self, File, OpenOptions};
use std::borrow::Cow;
use disk::fs::FileSystem;
pub struct NativeFile {
file: File,
path: PathBuf,
}
impl NativeFile {
fn new(file: File, path: PathBuf) -> NativeFile {
NativeFile{ file: file, path: path }
}
}
pub struct NativeFileSystem {
current_dir: PathBuf
}
impl NativeFileSystem {
pub fn with_directory<P>(default: P) -> NativeFileSystem
where P: AsRef<Path> {
NativeFileSystem{ current_dir: default.as_ref().to_path_buf() }
}
}
impl FileSystem for NativeFileSystem {
type File = NativeFile;
fn open_file<P>(&self, path: P) -> io::Result<Self::File>
where P: AsRef<Path> + Send + 'static {
let combine_path = combine_user_path(&path, &self.current_dir);
let file = try!(create_new_file(&combine_path));
Ok(NativeFile::new(file, combine_path.into_owned()))
}
fn file_size(&self, file: &NativeFile) -> io::Result<u64> {
file.file.metadata().map(|metadata| metadata.len())
}
fn remove_file(&self, file: NativeFile) -> io::Result<()> {
fs::remove_file(&file.path)
}
fn read_file(&self, file: &mut NativeFile, offset: u64, buffer: &mut [u8]) -> io::Result<usize> {
try!(file.file.seek(SeekFrom::Start(offset)));
file.file.read(buffer)
}
fn write_file(&self, file: &mut NativeFile, offset: u64, buffer: &[u8]) -> io::Result<usize> {
try!(file.file.seek(SeekFrom::Start(offset)));
file.file.write(buffer)
}
}
fn create_new_file<P>(path: P) -> io::Result<File>
where P: AsRef<Path> {
match path.as_ref().parent() {
Some(parent_dir) => {
try!(fs::create_dir_all(parent_dir));
OpenOptions::new().read(true).write(true).create(true).open(&path)
},
None => {
Err(io::Error::new(io::ErrorKind::InvalidInput, "File Path Has No Parent"))
}
}
}
fn combine_user_path<'a, P>(user_path: &'a P, current_dir: &Path) -> Cow<'a, Path>
where P: AsRef<Path> {
let ref_user_path = user_path.as_ref();
if ref_user_path.is_absolute() {
Cow::Borrowed(ref_user_path)
} else {
let mut combine_user_path = current_dir.to_path_buf();
for user_path_piece in ref_user_path.iter() {
combine_user_path.push(user_path_piece);
}
Cow::Owned(combine_user_path)
}
}