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#[cfg(feature = "use_alloc")]
use crate::alloc::vec::Vec;
#[cfg(feature = "use_alloc")]
use crate::core::enc;
use crate::core::dec;
#[cfg(feature = "use_alloc")]
pub struct BufWriter(Vec<u8>);
#[cfg(feature = "use_alloc")]
impl BufWriter {
pub fn new(buf: Vec<u8>) -> Self {
BufWriter(buf)
}
pub fn buffer(&self) -> &[u8] {
&self.0
}
pub fn into_inner(self) -> Vec<u8> {
self.0
}
pub fn clear(&mut self) {
self.0.clear();
}
}
#[cfg(feature = "use_alloc")]
impl enc::Write for BufWriter {
type Error = crate::alloc::collections::TryReserveError;
#[inline]
fn push(&mut self, input: &[u8]) -> Result<(), Self::Error> {
self.0.try_reserve(input.len())?;
self.0.extend_from_slice(input);
Ok(())
}
}
pub struct SliceReader<'a> {
buf: &'a [u8],
limit: usize
}
impl SliceReader<'_> {
pub fn new(buf: &[u8]) -> SliceReader<'_> {
SliceReader { buf, limit: 256 }
}
}
impl<'de> dec::Read<'de> for SliceReader<'de> {
type Error = crate::core::error::Never;
#[inline]
fn fill<'b>(&'b mut self, want: usize) -> Result<dec::Reference<'de, 'b>, Self::Error> {
let len = core::cmp::min(self.buf.len(), want);
Ok(dec::Reference::Long(&self.buf[..len]))
}
#[inline]
fn advance(&mut self, n: usize) {
let len = core::cmp::min(self.buf.len(), n);
self.buf = &self.buf[len..];
}
#[inline]
fn step_in(&mut self) -> bool {
if let Some(limit) = self.limit.checked_sub(1) {
self.limit = limit;
true
} else {
false
}
}
#[inline]
fn step_out(&mut self) {
self.limit += 1;
}
}
#[cfg(feature = "use_std")]
pub struct IoWriter<W>(W);
#[cfg(feature = "use_std")]
impl<W> IoWriter<W> {
pub fn new(writer: W) -> Self {
IoWriter(writer)
}
pub fn into_inner(self) -> W {
self.0
}
}
#[cfg(feature = "use_std")]
impl<W: std::io::Write> enc::Write for IoWriter<W> {
type Error = std::io::Error;
#[inline]
fn push(&mut self, input: &[u8]) -> Result<(), Self::Error> {
self.0.write_all(input)
}
}
#[cfg(feature = "use_std")]
pub struct IoReader<R> {
reader: R,
limit: usize,
}
#[cfg(feature = "use_std")]
impl<R> IoReader<R> {
pub fn new(reader: R) -> Self {
Self { reader, limit: 256 }
}
pub fn into_inner(self) -> R {
self.reader
}
}
#[cfg(feature = "use_std")]
impl<'de, R: std::io::BufRead> dec::Read<'de> for IoReader<R> {
type Error = std::io::Error;
#[inline]
fn fill<'b>(&'b mut self, _want: usize) -> Result<dec::Reference<'de, 'b>, Self::Error> {
let buf = self.reader.fill_buf()?;
Ok(dec::Reference::Short(buf))
}
#[inline]
fn advance(&mut self, n: usize) {
self.reader.consume(n);
}
#[inline]
fn step_in(&mut self) -> bool {
if let Some(limit) = self.limit.checked_sub(1) {
self.limit = limit;
true
} else {
false
}
}
#[inline]
fn step_out(&mut self) {
self.limit += 1;
}
}