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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2026 metamuffin <metamuffin.org>
*/
use crate::{Object, ObjectBuffer, Tag};
pub trait Value<'a>: ValueStore + Sized {
const ALIGNED: bool;
fn load_aligned(buf: &'a [u32]) -> Option<Self> {
let _ = buf;
unimplemented!()
}
fn load_unaligned(buf: &'a [u8]) -> Option<Self> {
let _ = buf;
unimplemented!()
}
}
pub trait ValueStore {
fn is_aligned(&self) -> bool;
fn store_aligned(&self, _buf: &mut Vec<u32>) {}
fn store_unaligned(&self, _buf: &mut Vec<u8>) {}
fn size(&self) -> usize;
}
impl<'a> Value<'a> for &'a str {
const ALIGNED: bool = false;
fn load_unaligned(buf: &'a [u8]) -> Option<Self> {
str::from_utf8(buf).ok()
}
}
impl ValueStore for &str {
fn is_aligned(&self) -> bool {
false
}
fn store_unaligned(&self, buf: &mut Vec<u8>) {
buf.extend(self.as_bytes());
}
fn size(&self) -> usize {
self.len()
}
}
impl Value<'_> for u32 {
const ALIGNED: bool = true;
fn load_aligned(buf: &[u32]) -> Option<Self> {
buf.get(0).copied().map(u32::from_be)
}
}
impl ValueStore for u32 {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
buf.push(self.to_be());
}
fn size(&self) -> usize {
4
}
}
impl Value<'_> for Tag {
const ALIGNED: bool = true;
fn load_aligned(buf: &[u32]) -> Option<Self> {
buf.get(0).copied().map(u32::from_be).map(Tag)
}
}
impl ValueStore for Tag {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
buf.push(self.0.to_be());
}
fn size(&self) -> usize {
4
}
}
impl Value<'_> for u64 {
const ALIGNED: bool = true;
fn load_aligned(buf: &[u32]) -> Option<Self> {
let hi = u32::from_be(*buf.get(0)?) as u64;
let lo = u32::from_be(*buf.get(1)?) as u64;
Some(hi << 32 | lo)
}
}
impl ValueStore for u64 {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
buf.push(((self >> 32) as u32).to_be());
buf.push((*self as u32).to_be());
}
fn size(&self) -> usize {
8
}
}
impl Value<'_> for f64 {
const ALIGNED: bool = true;
fn load_aligned(buf: &[u32]) -> Option<Self> {
if buf.len() < 2 {
return None;
};
let a = u32::to_be_bytes(buf[0]);
let b = u32::to_be_bytes(buf[1]);
Some(f64::from_be_bytes([
a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3],
]))
}
}
impl ValueStore for f64 {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
let b = self.to_be_bytes();
buf.push(u32::from_be_bytes([b[0], b[1], b[2], b[3]]));
buf.push(u32::from_be_bytes([b[4], b[5], b[6], b[7]]));
}
fn size(&self) -> usize {
8
}
}
impl Value<'_> for i64 {
const ALIGNED: bool = true;
fn load_aligned(buf: &[u32]) -> Option<Self> {
u32::load_aligned(buf).map(|x| x as i64)
}
}
impl ValueStore for i64 {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
(*self as u64).store_aligned(buf);
}
fn size(&self) -> usize {
8
}
}
impl<'a> Value<'a> for Object<'a> {
const ALIGNED: bool = true;
fn load_aligned(buf: &'a [u32]) -> Option<Self> {
Self::load(buf)
}
}
impl ValueStore for Object<'_> {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
buf.push(self.tags.len() as u32);
buf.extend(self.tags);
buf.extend(self.offsets);
buf.extend(self.values);
}
fn size(&self) -> usize {
(self.tags.len() + self.offsets.len() + self.values.len()) * size_of::<u32>()
}
}
impl ValueStore for ObjectBuffer {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, buf: &mut Vec<u32>) {
buf.extend(&self.0);
}
fn size(&self) -> usize {
self.0.len() * 4
}
}
impl<'a> Value<'a> for &'a [u8] {
const ALIGNED: bool = false;
fn load_unaligned(buf: &'a [u8]) -> Option<Self> {
Some(buf)
}
}
impl ValueStore for &[u8] {
fn is_aligned(&self) -> bool {
false
}
fn store_unaligned(&self, buf: &mut Vec<u8>) {
buf.extend(*self);
}
fn size(&self) -> usize {
self.len()
}
}
impl<'a> Value<'a> for () {
const ALIGNED: bool = true;
fn load_aligned(_buf: &'a [u32]) -> Option<Self> {
Some(())
}
}
impl ValueStore for () {
fn is_aligned(&self) -> bool {
true
}
fn store_aligned(&self, _buf: &mut Vec<u32>) {}
fn size(&self) -> usize {
0
}
}
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