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//! Very simple file system primitives
#![allow(dead_code)]
use std::fs::OpenOptions;
use std::io::{Read, Result, Write};
use std::path::PathBuf;
/// A set of files that exist inside a `FileVault`
pub enum FileType {
/// A data record file
Record,
/// A MetaDomain file
Metadata,
/// A simple checksum file
Checksum,
/// _The_ config file
Config,
#[doc(hidden)]
__NonExhaustive,
}
/// Construct a file ending for a specific match result
macro_rules! file_ending {
($type:expr) => {
match $type {
&FileType::Record => "record",
&FileType::Metadata => "meta",
&FileType::Checksum => "sum",
&FileType::Config => "cfg",
_ => "dat",
}
};
}
#[inline]
fn type_path(tt: FileType, root: &PathBuf) -> PathBuf {
use self::FileType::*;
let mut path = root.clone();
match tt {
Record => path.push("records"),
Metadata => path.push("metadata"),
Checksum => path.push("checksums"),
_ => path.push("."),
};
path
}
pub(crate) fn write_file(
tt: FileType,
root: &PathBuf,
name: &str,
contents: Vec<u8>,
) -> Result<()> {
let file_name = format!("{}.{}", name, file_ending!(&tt));
let mut path = type_path(tt, &root);
path.push(file_name);
let mut file = OpenOptions::new().write(true).create(true).open(path)?;
file.write_all(&contents)?;
Ok(())
}
pub(crate) fn read_file(tt: FileType, root: &PathBuf, name: &str) -> Result<Vec<u8>> {
let file_name = format!("{}.{}", name, file_ending!(&tt));
let mut path = type_path(tt, &root);
path.push(file_name);
let mut file = OpenOptions::new().read(true).create(false).open(path)?;
let mut buffer = Vec::<u8>::new();
file.read_to_end(&mut buffer).map(|_| buffer)
}
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