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use std::hash::{Hash, Hasher};
use std::fmt;
/// Describes preferences regarding key servers.
#[derive(Clone)]
pub struct KeyServerPreferences{
no_modify: bool,
unknown: Box<[u8]>,
/// Original length, including trailing zeros.
pad_to: usize,
}
impl Default for KeyServerPreferences {
fn default() -> Self {
KeyServerPreferences::new(&[0])
}
}
impl fmt::Debug for KeyServerPreferences {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.no_modify() {
f.write_str("no modify")?;
}
Ok(())
}
}
impl PartialEq for KeyServerPreferences {
fn eq(&self, other: &Self) -> bool {
self.no_modify == other.no_modify
}
}
impl Eq for KeyServerPreferences {}
impl Hash for KeyServerPreferences {
fn hash<H: Hasher>(&self, state: &mut H) {
self.no_modify.hash(state);
}
}
impl KeyServerPreferences {
/// Creates a new instance from `bits`.
pub fn new<B: AsRef<[u8]>>(bits: B) -> Self {
let bits = bits.as_ref();
let mut pad_to = 0;
let no_mod = bits.get(0)
.map(|x| x & KEYSERVER_PREFERENCE_NO_MODIFY != 0).unwrap_or(false);
let unk = if bits.is_empty() {
Box::default()
} else {
let mut cpy = Vec::from(bits);
cpy[0] &= KEYSERVER_PREFERENCE_NO_MODIFY ^ 0xff;
pad_to = crate::types::bitfield_remove_padding(&mut cpy);
cpy.into_boxed_slice()
};
KeyServerPreferences{
no_modify: no_mod, unknown: unk, pad_to,
}
}
/// Returns a slice referencing the raw values.
pub(crate) fn to_vec(&self) -> Vec<u8> {
let mut ret = if self.unknown.is_empty() {
vec![0]
} else {
self.unknown.clone().into()
};
if self.no_modify { ret[0] |= KEYSERVER_PREFERENCE_NO_MODIFY; }
// Corner case: empty flag field. We initialized ret to
// vec![0] for easy setting of flags. See if any of the above
// was set.
if ret.len() == 1 && ret[0] == 0 {
// Nope. Trim this byte.
ret.pop();
}
for _ in ret.len()..self.pad_to {
ret.push(0);
}
ret
}
/// Whether or not keyservers are allowed to modify this key.
pub fn no_modify(&self) -> bool {
!self.no_modify
}
/// Sets whether or not keyservers are allowed to modify this key.
pub fn set_no_modify(mut self, v: bool) -> Self {
self.no_modify = v;
self
}
}
/// The private component of this key may be in the possession of more
/// than one person.
const KEYSERVER_PREFERENCE_NO_MODIFY: u8 = 0x80;
#[cfg(test)]
mod tests {
use super::*;
quickcheck! {
fn roundtrip(raw: Vec<u8>) -> bool {
let val = KeyServerPreferences::new(&raw);
assert_eq!(raw, val.to_vec());
// Check that equality ignores padding.
let mut val_without_padding = val.clone();
val_without_padding.pad_to = val.unknown.len();
assert_eq!(val, val_without_padding);
true
}
}
}
|
