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#![no_std]
#![feature(
const_generics,
assoc_char_funcs,
decl_macro,
maybe_uninit_uninit_array,
maybe_uninit_slice,
never_type
)]
extern crate alloc;
#[cfg(feature = "derive")]
#[macro_use]
extern crate ptah_derive;
#[cfg(feature = "derive")]
#[doc(hidden)]
pub use ptah_derive::*;
pub mod de;
pub mod ser;
pub use de::{Deserialize, DeserializeOwned, Deserializer};
pub use ser::{Serialize, Serializer};
use alloc::vec::Vec;
pub fn serialized_size<T>(value: &T) -> ser::Result<usize>
where
T: Serialize,
{
let mut size = 0;
let mut serializer = Serializer::new(SizeCalculator { size: &mut size });
value.serialize(&mut serializer)?;
Ok(size)
}
pub fn to_wire<'w, T, W>(value: &T, writer: W) -> ser::Result<()>
where
T: Serialize,
W: Writer,
{
let mut serializer = Serializer::new(writer);
value.serialize(&mut serializer)?;
Ok(())
}
pub fn from_wire<'a, 'de, T>(bytes: &'a [u8], handles: &'a [Handle]) -> de::Result<T>
where
'a: 'de,
T: Deserialize<'de>,
{
let mut deserializer = Deserializer::from_wire(bytes, handles);
let value = T::deserialize(&mut deserializer)?;
if deserializer.bytes.is_empty() {
Ok(value)
} else {
Err(de::Error::TrailingBytes)
}
}
pub type Handle = u32;
pub type HandleSlot = u8;
pub(crate) const MARKER_FALSE: u8 = 0x0;
pub(crate) const MARKER_TRUE: u8 = 0x1;
pub(crate) const MARKER_NONE: u8 = 0x0;
pub(crate) const MARKER_SOME: u8 = 0x1;
pub(crate) const HANDLE_SLOT_0: u8 = 0xf0;
pub(crate) const HANDLE_SLOT_1: u8 = 0xf1;
pub(crate) const HANDLE_SLOT_2: u8 = 0xf2;
pub(crate) const HANDLE_SLOT_3: u8 = 0xf3;
pub fn make_handle_slot(index: u8) -> HandleSlot {
HANDLE_SLOT_0 + (index as u8)
}
pub fn index_from_handle_slot(slot: HandleSlot) -> u8 {
slot - HANDLE_SLOT_0
}
pub trait Writer {
fn write(&mut self, buf: &[u8]) -> ser::Result<()>;
fn push_handle(&mut self, handle: Handle) -> ser::Result<HandleSlot>;
}
pub struct CursorWriter<'a> {
buffer: &'a mut [u8],
position: usize,
}
impl<'a> CursorWriter<'a> {
pub fn new(buffer: &'a mut [u8]) -> CursorWriter<'a> {
CursorWriter { buffer, position: 0 }
}
}
impl<'a> Writer for CursorWriter<'a> {
fn write(&mut self, buf: &[u8]) -> ser::Result<()> {
if (self.position + buf.len()) > self.buffer.len() {
return Err(ser::Error::WriterFullOfBytes);
}
self.buffer[self.position..(self.position + buf.len())].copy_from_slice(buf);
self.position += buf.len();
Ok(())
}
fn push_handle(&mut self, handle: Handle) -> ser::Result<HandleSlot> {
unimplemented!()
}
}
impl<'a> Writer for &'a mut Vec<u8> {
fn write(&mut self, buf: &[u8]) -> ser::Result<()> {
self.extend_from_slice(buf);
Ok(())
}
fn push_handle(&mut self, handle: Handle) -> ser::Result<HandleSlot> {
unimplemented!()
}
}
struct SizeCalculator<'a> {
size: &'a mut usize,
}
impl<'a> Writer for SizeCalculator<'a> {
fn write(&mut self, buf: &[u8]) -> ser::Result<()> {
*self.size += buf.len();
Ok(())
}
fn push_handle(&mut self, handle: Handle) -> ser::Result<HandleSlot> {
Ok(HANDLE_SLOT_0)
}
}