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extern crate bytes;
use crate::frame::FLAG_METADATA;
use bytes::{BufMut, Bytes, BytesMut};
pub struct U24 {}
impl U24 {
pub fn write(n: u32, bf: &mut BytesMut) {
bf.put_u8((0xFF & (n >> 16)) as u8);
bf.put_u8((0xFF & (n >> 8)) as u8);
bf.put_u8((0xFF & n) as u8);
}
pub fn read(bf: &mut BytesMut) -> u32 {
let mut n: u32 = 0;
let bar = bf.split_to(3);
n += (bar[0] as u32) << 16;
n += (bar[1] as u32) << 8;
n += bar[2] as u32;
n
}
}
pub struct PayloadSupport {}
impl PayloadSupport {
pub fn len(metadata: &Option<Bytes>, data: &Option<Bytes>) -> u32 {
let a: u32 = match metadata {
Some(v) => 3 + (v.len() as u32),
None => 0,
};
let b: u32 = match data {
Some(v) => v.len() as u32,
None => 0,
};
a + b
}
pub fn read(flag: u16, bf: &mut BytesMut) -> (Option<Bytes>, Option<Bytes>) {
let m: Option<Bytes> = if flag & FLAG_METADATA != 0 {
let n = U24::read(bf);
Some(Bytes::from(bf.split_to(n as usize)))
} else {
None
};
let d: Option<Bytes> = if bf.is_empty() {
None
} else {
Some(Bytes::from(bf.to_vec()))
};
(m, d)
}
pub fn write(bf: &mut BytesMut, metadata: &Option<Bytes>, data: &Option<Bytes>) {
match metadata {
Some(v) => {
let n = v.len() as u32;
U24::write(n, bf);
bf.put(v);
}
None => (),
}
match data {
Some(v) => bf.put(v),
None => (),
}
}
}