Add Deserializer for server bound packets

pumpkin-protocol/src/bytebuf/deserializer.rs

@@ -0,0 +1,321 @@
+use std::fmt::Display;
+
+use serde::de::{self, DeserializeSeed, SeqAccess};
+use thiserror::Error;
+
+use super::ByteBuffer;
+
+pub struct Deserializer<'a> {
+    inner: &'a mut ByteBuffer,
+}
+
+#[derive(Debug, Error)]
+pub enum DeserializerError {
+    #[error("serializer error {0}")]
+    Message(String),
+    #[error("Stdio error")]
+    Stdio(std::io::Error),
+}
+
+impl de::Error for DeserializerError {
+    fn custom<T: Display>(msg: T) -> Self {
+        Self::Message(msg.to_string())
+    }
+}
+
+impl<'a> Deserializer<'a> {
+    pub fn new(buf: &'a mut ByteBuffer) -> Self {
+        Self { inner: buf }
+    }
+}
+
+impl<'a, 'de> de::Deserializer<'de> for Deserializer<'a> {
+    type Error = DeserializerError;
+
+    fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!(
+            "This is impossible to do, since you cannot infer the data structure from the packet"
+        )
+    }
+
+    fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_bool(self.inner.get_bool())
+    }
+
+    fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_i8(self.inner.get_i8())
+    }
+
+    fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_i16(self.inner.get_i16())
+    }
+
+    fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_i32(self.inner.get_i32())
+    }
+
+    fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_i64(self.inner.get_i64())
+    }
+
+    fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_u8(self.inner.get_u8())
+    }
+
+    fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_u16(self.inner.get_u16())
+    }
+
+    fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_u32(self.inner.get_u32())
+    }
+
+    fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_u64(self.inner.get_u64())
+    }
+
+    fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_f32(self.inner.get_f32())
+    }
+
+    fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_f64(self.inner.get_f64())
+    }
+
+    fn deserialize_char<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        let string = self.inner.get_string().map_err(DeserializerError::Stdio)?;
+        visitor.visit_str(&string)
+    }
+
+    fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        let string = self.inner.get_string().map_err(DeserializerError::Stdio)?;
+        visitor.visit_str(&string)
+    }
+
+    fn deserialize_bytes<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_byte_buf<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_option<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_unit<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_unit_struct<V>(
+        self,
+        _name: &'static str,
+        _visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_newtype_struct<V>(
+        self,
+        _name: &'static str,
+        _visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_seq<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        struct Access<'a, 'b> {
+            deserializer: &'a mut Deserializer<'b>,
+        }
+
+        impl<'de, 'a, 'b: 'a> SeqAccess<'de> for Access<'a, 'b> {
+            type Error = DeserializerError;
+
+            fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
+            where
+                T: de::DeserializeSeed<'de>,
+            {
+                let value = DeserializeSeed::deserialize(
+                    seed,
+                    Deserializer {
+                        inner: self.deserializer.inner,
+                    },
+                )?;
+                Ok(Some(value))
+            }
+        }
+
+        let value = visitor.visit_seq(Access {
+            deserializer: &mut self,
+        });
+
+        value
+    }
+
+    fn deserialize_tuple<V>(mut self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        struct Access<'a, 'b> {
+            deserializer: &'a mut Deserializer<'b>,
+            len: usize,
+        }
+
+        impl<'de, 'a, 'b: 'a> SeqAccess<'de> for Access<'a, 'b> {
+            type Error = DeserializerError;
+
+            fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
+            where
+                T: de::DeserializeSeed<'de>,
+            {
+                if self.len > 0 {
+                    self.len -= 1;
+                    let value = DeserializeSeed::deserialize(
+                        seed,
+                        Deserializer {
+                            inner: self.deserializer.inner,
+                        },
+                    )?;
+                    Ok(Some(value))
+                } else {
+                    Ok(None)
+                }
+            }
+        }
+
+        let value = visitor.visit_seq(Access {
+            deserializer: &mut self,
+            len,
+        });
+
+        value
+    }
+
+    fn deserialize_tuple_struct<V>(
+        self,
+        _name: &'static str,
+        _len: usize,
+        _visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_map<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_struct<V>(
+        self,
+        _name: &'static str,
+        fields: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        self.deserialize_tuple(fields.len(), visitor)
+    }
+
+    fn deserialize_enum<V>(
+        self,
+        _name: &'static str,
+        _variants: &'static [&'static str],
+        _visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_identifier<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+
+    fn deserialize_ignored_any<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        unimplemented!()
+    }
+}

pumpkin-protocol/src/bytebuf/mod.rs

@@ -3,6 +3,8 @@ use bytes::{Buf, BufMut, BytesMut};
 use core::str;
 use std::io::{self, Error, ErrorKind};
 
+mod deserializer;
+pub use deserializer::DeserializerError;
 pub mod packet_id;
 mod serializer;
 
@@ -312,3 +314,47 @@ impl ByteBuffer {
         self.buffer.split()
     }
 }
+
+#[cfg(test)]
+mod test {
+    use serde::{Deserialize, Serialize};
+
+    use crate::{
+        bytebuf::{deserializer, serializer, ByteBuffer},
+        VarInt,
+    };
+
+    #[test]
+    fn test_i32_reserialize() {
+        #[derive(serde::Serialize, serde::Deserialize, PartialEq, Eq, Debug)]
+        struct Foo {
+            bar: i32,
+        }
+        let foo = Foo { bar: 69 };
+        let mut serializer = serializer::Serializer::new(ByteBuffer::empty());
+        foo.serialize(&mut serializer).unwrap();
+
+        let mut serialized: ByteBuffer = serializer.into();
+        let deserialized: Foo =
+            Foo::deserialize(deserializer::Deserializer::new(&mut serialized)).unwrap();
+
+        assert_eq!(foo, deserialized);
+    }
+
+    #[test]
+    fn test_varint_reserialize() {
+        #[derive(serde::Serialize, serde::Deserialize, PartialEq, Eq, Debug)]
+        struct Foo {
+            bar: VarInt,
+        }
+        let foo = Foo { bar: 69.into() };
+        let mut serializer = serializer::Serializer::new(ByteBuffer::empty());
+        foo.serialize(&mut serializer).unwrap();
+
+        let mut serialized: ByteBuffer = serializer.into();
+        let deserialized: Foo =
+            Foo::deserialize(deserializer::Deserializer::new(&mut serialized)).unwrap();
+
+        assert_eq!(foo, deserialized);
+    }
+}