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pub use super::int::LenEnc;
use std::{borrow::Cow, cmp::min, fmt, io, marker::PhantomData};
use bytes::BufMut;
use crate::{
io::{BufMutExt, ParseBuf},
misc::unexpected_buf_eof,
proto::{MyDeserialize, MySerialize},
};
use super::{int::VarLen, RawInt};
#[derive(Clone, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[repr(transparent)]
pub struct RawBytes<'a, T: BytesRepr>(pub Cow<'a, [u8]>, PhantomData<T>);
impl<'a, T: BytesRepr> RawBytes<'a, T> {
pub fn new(text: impl Into<Cow<'a, [u8]>>) -> Self {
Self(text.into(), PhantomData)
}
pub fn into_owned(self) -> RawBytes<'static, T> {
RawBytes(Cow::Owned(self.0.into_owned()), PhantomData)
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn len(&self) -> usize {
min(self.0.as_ref().len(), T::MAX_LEN)
}
pub fn as_bytes(&'a self) -> &'a [u8] {
&self.0.as_ref()[..self.len()]
}
pub fn as_str(&'a self) -> Cow<'a, str> {
String::from_utf8_lossy(self.as_bytes())
}
}
impl<'a, T: Into<Cow<'a, [u8]>>, U: BytesRepr> From<T> for RawBytes<'a, U> {
fn from(bytes: T) -> RawBytes<'a, U> {
RawBytes::new(bytes)
}
}
impl<T: BytesRepr> PartialEq<[u8]> for RawBytes<'_, T> {
fn eq(&self, other: &[u8]) -> bool {
self.0.as_ref().eq(other)
}
}
impl<T: BytesRepr> MySerialize for RawBytes<'_, T> {
fn serialize(&self, buf: &mut Vec<u8>) {
T::serialize(self.0.as_ref(), buf)
}
}
impl<'de, T: BytesRepr> MyDeserialize<'de> for RawBytes<'de, T> {
const SIZE: Option<usize> = T::SIZE;
type Ctx = T::Ctx;
#[inline(always)]
fn deserialize(ctx: Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Self> {
Ok(Self(T::deserialize(ctx, buf)?, PhantomData))
}
}
impl<T: BytesRepr> fmt::Debug for RawBytes<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("RawBytes")
.field("value", &self.as_str())
.field(
"max_len",
&(if self.0.len() <= T::MAX_LEN {
format!("{}", T::MAX_LEN)
} else {
format!("{} EXCEEDED!", T::MAX_LEN)
}),
)
.finish()
}
}
pub trait BytesRepr {
const MAX_LEN: usize;
const SIZE: Option<usize>;
type Ctx;
fn serialize(text: &[u8], buf: &mut Vec<u8>);
fn deserialize<'de>(ctx: Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>>;
}
impl BytesRepr for LenEnc {
const MAX_LEN: usize = usize::MAX;
const SIZE: Option<usize> = None;
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
buf.put_lenenc_int(text.len() as u64);
buf.put_slice(text);
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
let len = buf.parse::<RawInt<LenEnc>>(())?;
buf.checked_eat(len.0 as usize)
.map(Cow::Borrowed)
.ok_or_else(unexpected_buf_eof)
}
}
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct U8Bytes;
impl BytesRepr for U8Bytes {
const MAX_LEN: usize = u8::MAX as usize;
const SIZE: Option<usize> = None;
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
buf.put_u8_str(text);
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
let len: RawInt<u8> = buf.parse(())?;
buf.checked_eat(len.0 as usize)
.map(Cow::Borrowed)
.ok_or_else(unexpected_buf_eof)
}
}
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct U32Bytes;
impl BytesRepr for U32Bytes {
const MAX_LEN: usize = u32::MAX as usize;
const SIZE: Option<usize> = None;
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
buf.put_u32_str(text);
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
buf.checked_eat_u32_str()
.map(Cow::Borrowed)
.ok_or_else(unexpected_buf_eof)
}
}
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct NullBytes;
impl BytesRepr for NullBytes {
const MAX_LEN: usize = usize::MAX;
const SIZE: Option<usize> = None;
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
let last = text
.iter()
.position(|x| *x == 0)
.unwrap_or_else(|| text.len());
buf.put_slice(&text[..last]);
buf.put_u8(0);
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
match buf.0.iter().position(|x| *x == 0) {
Some(i) => {
let out = buf.eat(i);
buf.skip(1);
Ok(Cow::Borrowed(out))
}
None => Err(io::Error::new(
io::ErrorKind::InvalidData,
"no null terminator for null-terminated string",
)),
}
}
}
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct EofBytes;
impl BytesRepr for EofBytes {
const MAX_LEN: usize = usize::MAX;
const SIZE: Option<usize> = None;
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
buf.put_slice(text);
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
Ok(Cow::Borrowed(buf.eat_all()))
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct BareBytes<const MAX_LEN: usize>;
impl<const MAX_LEN: usize> BytesRepr for BareBytes<MAX_LEN> {
const MAX_LEN: usize = MAX_LEN;
const SIZE: Option<usize> = None;
type Ctx = usize;
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
let len = min(text.len(), MAX_LEN);
buf.put_slice(&text[..len]);
}
fn deserialize<'de>(len: usize, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
buf.checked_eat(len)
.ok_or_else(unexpected_buf_eof)
.map(Cow::Borrowed)
}
}
pub type BareU8Bytes = BareBytes<{ u8::MAX as usize }>;
pub type BareU16Bytes = BareBytes<{ u16::MAX as usize }>;
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct FixedLengthText<const LEN: usize>;
impl<const LEN: usize> BytesRepr for FixedLengthText<LEN> {
const MAX_LEN: usize = LEN;
const SIZE: Option<usize> = Some(LEN);
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
let len = min(LEN, text.len());
buf.put_slice(&text[..len]);
for _ in 0..(LEN - len) {
buf.put_u8(0);
}
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
match Self::SIZE {
Some(len) => Ok(Cow::Borrowed(buf.eat(len))),
None => buf
.checked_eat(LEN)
.map(Cow::Borrowed)
.ok_or_else(unexpected_buf_eof),
}
}
}
impl BytesRepr for VarLen {
const MAX_LEN: usize = u32::MAX as usize;
const SIZE: Option<usize> = None;
type Ctx = ();
fn serialize(text: &[u8], buf: &mut Vec<u8>) {
buf.put_lenenc_int(text.len() as u64);
buf.put_slice(text);
}
fn deserialize<'de>((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Cow<'de, [u8]>> {
let len = buf.parse::<RawInt<VarLen>>(())?;
buf.checked_eat(len.0 as usize)
.map(Cow::Borrowed)
.ok_or_else(unexpected_buf_eof)
}
}
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct ConstBytes<T, const LEN: usize>(PhantomData<T>);
pub trait ConstBytesValue<const LEN: usize> {
const VALUE: [u8; LEN];
type Error: Default + std::error::Error + Send + Sync + 'static;
}
impl<'de, T, const LEN: usize> MyDeserialize<'de> for ConstBytes<T, LEN>
where
T: Default,
T: ConstBytesValue<LEN>,
{
const SIZE: Option<usize> = Some(LEN);
type Ctx = ();
fn deserialize((): Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Self> {
let bytes: [u8; LEN] = buf.parse_unchecked(())?;
if bytes == T::VALUE {
Ok(Default::default())
} else {
Err(io::Error::new(
io::ErrorKind::InvalidData,
T::Error::default(),
))
}
}
}
impl<T, const LEN: usize> MySerialize for ConstBytes<T, LEN>
where
T: ConstBytesValue<LEN>,
{
fn serialize(&self, buf: &mut Vec<u8>) {
T::VALUE.serialize(buf)
}
}