use std::io::Cursor;
use bytes::Bytes;
use crate::bufext::BufExt;
pub trait BinaryType: Sized {
fn with_capacity(capacity: usize) -> Self;
fn extend_from_slice(&mut self, other: &[u8]);
fn from_vec(vec: Vec<u8>) -> Self {
let mut binary = Self::with_capacity(vec.len());
binary.extend_from_slice(&vec);
binary
}
}
pub trait CopyFromBuf: Sized {
fn copy_from_buf<B: BufExt>(buffer: &mut B, len: usize) -> Self;
fn from_vec(vec: Vec<u8>) -> Self {
Self::copy_from_buf(&mut Cursor::new(&vec), vec.len())
}
}
impl BinaryType for Vec<u8> {
fn with_capacity(capacity: usize) -> Self {
Vec::with_capacity(capacity)
}
fn extend_from_slice(&mut self, other: &[u8]) {
Vec::extend_from_slice(self, other);
}
fn from_vec(vec: Vec<u8>) -> Self {
vec
}
}
impl<T: BinaryType> CopyFromBuf for T {
fn copy_from_buf<B: BufExt>(buffer: &mut B, len: usize) -> Self {
assert!(buffer.remaining() >= len);
let mut result = T::with_capacity(len);
let mut remaining = len;
while remaining > 0 {
let part = buffer.chunk();
let part_len = part.len().min(remaining);
result.extend_from_slice(&part[..part_len]);
remaining -= part_len;
buffer.advance(part_len);
}
result
}
fn from_vec(vec: Vec<u8>) -> Self {
BinaryType::from_vec(vec)
}
}
pub(crate) struct Discard;
impl CopyFromBuf for Discard {
fn copy_from_buf<B: BufExt>(buffer: &mut B, len: usize) -> Self {
buffer.advance(len);
Discard
}
}
impl CopyFromBuf for Bytes {
fn copy_from_buf<B: BufExt>(buffer: &mut B, len: usize) -> Self {
buffer.copy_or_reuse_bytes(len)
}
fn from_vec(vec: Vec<u8>) -> Self {
vec.into()
}
}