87 lines
2.4 KiB
Rust
87 lines
2.4 KiB
Rust
use {
|
|
crate::Error,
|
|
std::{io::{Read, Write}, str::FromStr},
|
|
};
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
pub enum Algorithm {
|
|
Md5,
|
|
Sha1,
|
|
Sha256,
|
|
Skip,
|
|
}
|
|
|
|
impl FromStr for Algorithm {
|
|
type Err = Error;
|
|
|
|
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
|
match s {
|
|
"md5" | "Md5" => Ok(Self::Md5),
|
|
"sha1" | "Sha1" => Ok(Self::Sha1),
|
|
"sha256" | "Sha256" => Ok(Self::Sha256),
|
|
"skip" | "Skip" => Ok(Self::Skip),
|
|
_ => Err(Error::InvalidAlgorithm),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Optional checksumming for individual files
|
|
#[derive(Debug)]
|
|
pub enum Checksum {
|
|
/// Md5 checksumming, fastest
|
|
Md5([u8; 16]),
|
|
/// Sha1 checksumming. On par with md5.
|
|
Sha1([u8; 20]),
|
|
/// The most thorough checksumming offered. Use this if data integrity is of
|
|
/// utmost importance and computational overhead is of lesser importance.
|
|
Sha256([u8; 32]),
|
|
/// Do not use checksumming. If this option is selected it is recommended that
|
|
/// the entire archive is downloaded in entirety and checksummed to ensure it's
|
|
/// integrity, as was the pattern with Unix 'tar' archives and 'iso' images
|
|
Skip,
|
|
}
|
|
|
|
impl Checksum {
|
|
pub(crate) fn read<T: Read>(reader: &mut T) -> Result<Self, Error> {
|
|
let mut buf = [0; 1];
|
|
reader.read_exact(&mut buf)?;
|
|
match buf[0] {
|
|
0 => {
|
|
let mut sum = [0; 16];
|
|
reader.read_exact(&mut sum)?;
|
|
Ok(Self::Md5(sum))
|
|
}
|
|
1 => {
|
|
let mut sum = [0; 20];
|
|
reader.read_exact(&mut sum)?;
|
|
Ok(Self::Sha1(sum))
|
|
}
|
|
2 => {
|
|
let mut sum = [0; 32];
|
|
reader.read_exact(&mut sum)?;
|
|
Ok(Self::Sha256(sum))
|
|
}
|
|
_ => Ok(Self::Skip),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn write<T: Write>(&self, writer: &mut T) -> Result<(), Error> {
|
|
match self {
|
|
Self::Md5(sum) => {
|
|
writer.write_all(&[b'0'])?;
|
|
writer.write_all(&sum[..])?;
|
|
}
|
|
Self::Sha1(sum) => {
|
|
writer.write_all(&[b'1'])?;
|
|
writer.write_all(&sum[..])?;
|
|
}
|
|
Self::Sha256(sum) => {
|
|
writer.write_all(&[b'2'])?;
|
|
writer.write_all(&sum[..])?;
|
|
}
|
|
Self::Skip => writer.write_all(&[b'3'])?,
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|