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use std::{io, ops, ptr};
pub struct Buffer(Vec<u8>);
impl Buffer {
#[inline]
pub fn new() -> Self {
Buffer(Vec::new())
}
#[inline]
pub fn with_capacity(capacity: usize) -> Self {
Buffer(Vec::with_capacity(capacity))
}
#[inline]
pub fn into_bytes(self) -> Vec<u8> {
self.0
}
}
impl ops::Deref for Buffer {
type Target = Vec<u8>;
#[inline]
fn deref(&self) -> &Vec<u8> {
&self.0
}
}
impl ops::DerefMut for Buffer {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl io::Write for Buffer {
#[inline]
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
extend_from_slice(&mut self.0, buf);
Ok(buf.len())
}
#[inline]
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
extend_from_slice(&mut self.0, buf);
Ok(())
}
#[inline]
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
#[inline]
fn extend_from_slice(dst: &mut Vec<u8>, src: &[u8]) {
let dst_len = dst.len();
let src_len = src.len();
dst.reserve(src_len);
unsafe {
dst.set_len(dst_len + src_len);
ptr::copy_nonoverlapping(
src.as_ptr(),
dst.as_mut_ptr().offset(dst_len as isize),
src_len);
}
}