use crate::bytes::Bytes;
use crate::{binary_uvarint, Value, ValueExt};
pub const META_OFFSET: usize = 0;
pub const USER_META_OFFSET: usize = 1;
pub const EXPIRATION_OFFSET: usize = 2;
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct EncodedValue {
pub(crate) data: Bytes,
pub(crate) expires_sz: u8,
}
impl EncodedValue {
pub fn decode_value(&self) -> Value {
let meta = self.data[META_OFFSET];
let user_meta = self.data[USER_META_OFFSET];
let (expires_at, sz) = binary_uvarint(&self.data[EXPIRATION_OFFSET..]);
let value = self.data.slice(EXPIRATION_OFFSET + sz..);
Value {
meta,
user_meta,
expires_at,
version: 0,
value,
}
}
#[inline]
pub fn len(&self) -> usize {
self.data.len()
}
#[inline]
pub fn is_empty(&self) -> bool {
self.data.is_empty()
}
#[inline]
pub fn leak_data(self) -> Bytes {
self.data
}
}
impl ValueExt for EncodedValue {
#[inline]
fn parse_value(&self) -> &[u8] {
&self.data[(EXPIRATION_OFFSET + self.expires_sz as usize)..]
}
#[inline]
fn parse_value_to_bytes(&self) -> Bytes {
self.data
.slice((EXPIRATION_OFFSET + self.expires_sz as usize)..)
}
#[inline]
fn get_meta(&self) -> u8 {
self.data[META_OFFSET]
}
#[inline]
fn get_user_meta(&self) -> u8 {
self.data[USER_META_OFFSET]
}
#[inline]
fn get_expires_at(&self) -> u64 {
let (expires_at, _) = binary_uvarint(&self.data[EXPIRATION_OFFSET..]);
expires_at
}
#[inline]
fn to_encoded(&self) -> EncodedValue {
self.clone()
}
}
macro_rules! impl_value_ext_for_bytes {
($($ty: ty), +$(,)?) => {
$(
impl ValueExt for $ty {
#[inline]
fn parse_value(&self) -> &[u8] {
let (_, sz) = binary_uvarint(&self.as_ref()[EXPIRATION_OFFSET..]);
&self[(EXPIRATION_OFFSET + sz)..]
}
#[inline]
fn parse_value_to_bytes(&self) -> Bytes {
let (_, sz) = binary_uvarint(&self[EXPIRATION_OFFSET..]);
self.slice((EXPIRATION_OFFSET + sz)..)
}
#[inline]
fn get_meta(&self) -> u8 {
self[META_OFFSET]
}
#[inline]
fn get_user_meta(&self) -> u8 {
self[USER_META_OFFSET]
}
#[inline]
fn get_expires_at(&self) -> u64 {
let (expires_at, _) = binary_uvarint(&self[EXPIRATION_OFFSET..]);
expires_at
}
}
)*
};
}
impl_value_ext_for_bytes! {
Bytes,
}