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use crate::{
ser::{SeekSerializer, Serializer},
Fallible,
};
use core::ptr;
#[cfg(feature = "std")]
use std::io;
pub struct BufferSerializer<T> {
inner: T,
pos: usize,
}
impl<T> BufferSerializer<T> {
#[inline]
pub fn new(inner: T) -> Self {
Self::with_pos(inner, 0)
}
#[inline]
pub fn with_pos(inner: T, pos: usize) -> Self {
Self { inner, pos }
}
#[inline]
pub fn into_inner(self) -> T {
self.inner
}
}
#[derive(Debug)]
pub enum BufferSerializerError {
Overflow {
pos: usize,
bytes_needed: usize,
archive_len: usize,
},
SoughtPastEnd {
seek_position: usize,
archive_len: usize,
},
}
impl<T: AsRef<[u8]> + AsMut<[u8]>> Fallible for BufferSerializer<T> {
type Error = BufferSerializerError;
}
impl<T: AsRef<[u8]> + AsMut<[u8]>> Serializer for BufferSerializer<T> {
#[inline]
fn pos(&self) -> usize {
self.pos
}
fn write(&mut self, bytes: &[u8]) -> Result<(), Self::Error> {
let end_pos = self.pos + bytes.len();
let archive_len = self.inner.as_ref().len();
if end_pos > archive_len {
Err(BufferSerializerError::Overflow {
pos: self.pos,
bytes_needed: bytes.len(),
archive_len,
})
} else {
unsafe {
ptr::copy_nonoverlapping(
bytes.as_ptr(),
self.inner.as_mut().as_mut_ptr().add(self.pos),
bytes.len(),
);
}
self.pos = end_pos;
Ok(())
}
}
fn pad(&mut self, padding: usize) -> Result<(), Self::Error> {
let end_pos = self.pos + padding;
let archive_len = self.inner.as_ref().len();
if end_pos > archive_len {
Err(BufferSerializerError::Overflow {
pos: self.pos,
bytes_needed: padding,
archive_len,
})
} else {
self.pos = end_pos;
Ok(())
}
}
}
impl<T: AsRef<[u8]> + AsMut<[u8]>> SeekSerializer for BufferSerializer<T> {
fn seek(&mut self, pos: usize) -> Result<(), Self::Error> {
let len = self.inner.as_ref().len();
if pos > len {
Err(BufferSerializerError::SoughtPastEnd {
seek_position: pos,
archive_len: len,
})
} else {
self.pos = pos;
Ok(())
}
}
}
#[cfg(feature = "std")]
pub struct WriteSerializer<W: io::Write> {
inner: W,
pos: usize,
}
#[cfg(feature = "std")]
impl<W: io::Write> WriteSerializer<W> {
#[inline]
pub fn new(inner: W) -> Self {
Self::with_pos(inner, 0)
}
#[inline]
pub fn with_pos(inner: W, pos: usize) -> Self {
Self { inner, pos }
}
#[inline]
pub fn into_inner(self) -> W {
self.inner
}
}
#[cfg(feature = "std")]
impl<W: io::Write> Fallible for WriteSerializer<W> {
type Error = io::Error;
}
#[cfg(feature = "std")]
impl<W: io::Write> Serializer for WriteSerializer<W> {
#[inline]
fn pos(&self) -> usize {
self.pos
}
#[inline]
fn write(&mut self, bytes: &[u8]) -> Result<(), Self::Error> {
self.pos += self.inner.write(bytes)?;
Ok(())
}
}
#[cfg(feature = "std")]
impl<W: io::Write + io::Seek> SeekSerializer for WriteSerializer<W> {
#[inline]
fn seek(&mut self, offset: usize) -> Result<(), Self::Error> {
self.inner.seek(io::SeekFrom::Start(offset as u64))?;
self.pos = offset;
Ok(())
}
}