86 lines
2.1 KiB
Rust
86 lines
2.1 KiB
Rust
use std::io::Cursor;
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use std::{cmp::max, collections::HashMap};
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use tokio::io::{AsyncReadExt, AsyncWriteExt};
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use crate::coding::{AsyncRead, AsyncWrite, Decode, Encode};
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use crate::{
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coding::{DecodeError, EncodeError},
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VarInt,
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};
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#[derive(Default, Debug, Clone)]
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pub struct Params(pub HashMap<VarInt, Vec<u8>>);
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#[async_trait::async_trait]
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impl Decode for Params {
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async fn decode<R: AsyncRead>(mut r: &mut R) -> Result<Self, DecodeError> {
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let mut params = HashMap::new();
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// I hate this shit so much; let me encode my role and get on with my life.
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let count = VarInt::decode(r).await?;
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for _ in 0..count.into_inner() {
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let kind = VarInt::decode(r).await?;
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if params.contains_key(&kind) {
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return Err(DecodeError::DupliateParameter);
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}
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let size = VarInt::decode(r).await?;
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// Don't allocate the entire requested size to avoid a possible attack
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// Instead, we allocate up to 1024 and keep appending as we read further.
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let mut pr = r.take(size.into_inner());
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let mut buf = Vec::with_capacity(max(1024, pr.limit() as usize));
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pr.read_to_end(&mut buf).await?;
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params.insert(kind, buf);
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r = pr.into_inner();
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}
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Ok(Params(params))
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}
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}
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#[async_trait::async_trait]
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impl Encode for Params {
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async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
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VarInt::try_from(self.0.len())?.encode(w).await?;
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for (kind, value) in self.0.iter() {
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kind.encode(w).await?;
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VarInt::try_from(value.len())?.encode(w).await?;
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w.write_all(value).await?;
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}
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Ok(())
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}
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}
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impl Params {
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pub fn new() -> Self {
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Self::default()
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}
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pub async fn set<P: Encode>(&mut self, kind: VarInt, p: P) -> Result<(), EncodeError> {
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let mut value = Vec::new();
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p.encode(&mut value).await?;
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self.0.insert(kind, value);
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Ok(())
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}
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pub fn has(&self, kind: VarInt) -> bool {
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self.0.contains_key(&kind)
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}
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pub async fn get<P: Decode>(&mut self, kind: VarInt) -> Result<Option<P>, DecodeError> {
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if let Some(value) = self.0.remove(&kind) {
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let mut cursor = Cursor::new(value);
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Ok(Some(P::decode(&mut cursor).await?))
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} else {
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Ok(None)
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}
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}
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}
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