36 lines
1017 B
Rust
36 lines
1017 B
Rust
pub mod compressed;
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pub mod default;
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use async_trait::async_trait;
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use std::io;
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use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite};
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pub type Reader = dyn AsyncRead + Unpin + Send;
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pub type Writer = dyn AsyncWrite + Unpin + Send;
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#[async_trait]
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pub trait PacketFormat: Send + Sync {
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async fn recieve(&self, src: &mut Reader) -> io::Result<Box<[u8]>>;
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async fn send(&self, dest: &mut Writer, data: &[u8]) -> io::Result<()>;
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}
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/// A completely arbitrary limitation on the maximum size of a recieved packet.
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pub const MAX_PACKET_SIZE: usize = 35565;
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pub async fn read_varint(src: &mut Reader) -> io::Result<(usize, i32)> {
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let mut num_read: usize = 0;
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let mut acc = 0;
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while num_read < 5 {
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let byte = src.read_u8().await?;
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acc |= ((byte & 0b01111111) as i32) << num_read * 7;
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num_read += 1;
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if byte & 0b10000000 == 0 {
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return Ok((num_read, acc));
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}
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}
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Err(io::Error::new(io::ErrorKind::Other, "VarInt was too long.".to_string()))
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}
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