1 files changed, 43 insertions, 0 deletions
diff --git a/azalea-protocol/src/packets/game/c_section_blocks_update.rs b/azalea-protocol/src/packets/game/c_section_blocks_update.rs
new file mode 100755
index 00000000..4554c015
--- /dev/null
+++ b/azalea-protocol/src/packets/game/c_section_blocks_update.rs
@@ -0,0 +1,43 @@
+use std::io::{Cursor, Write};
+
+use azalea_block::BlockState;
+use azalea_buf::{AzBuf, AzaleaRead, AzaleaReadVar, AzaleaWrite, AzaleaWriteVar, BufReadError};
+use azalea_core::position::{ChunkSectionBlockPos, ChunkSectionPos};
+use azalea_protocol_macros::ClientboundGamePacket;
+
+#[derive(Clone, Debug, AzBuf, ClientboundGamePacket)]
+pub struct ClientboundSectionBlocksUpdate {
+    pub section_pos: ChunkSectionPos,
+    pub states: Vec<BlockStateWithPosition>,
+}
+
+#[derive(Clone, Debug)]
+pub struct BlockStateWithPosition {
+    pub pos: ChunkSectionBlockPos,
+    pub state: BlockState,
+}
+
+impl AzaleaRead for BlockStateWithPosition {
+    fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
+        let data = u64::azalea_read_var(buf)?;
+        let position_part = data & 4095;
+        let state = (data >> 12) as u32;
+        let state = BlockState::try_from(state)
+            .map_err(|_| BufReadError::UnexpectedEnumVariant { id: state as i32 })?;
+        let pos = ChunkSectionBlockPos {
+            x: (position_part >> 8 & 15) as u8,
+            y: (position_part & 15) as u8,
+            z: (position_part >> 4 & 15) as u8,
+        };
+        Ok(BlockStateWithPosition { pos, state })
+    }
+}
+
+impl AzaleaWrite for BlockStateWithPosition {
+    fn azalea_write(&self, buf: &mut impl Write) -> Result<(), std::io::Error> {
+        let data = (self.state.id as u64) << 12
+            | (u64::from(self.pos.x) << 8 | u64::from(self.pos.z) << 4 | u64::from(self.pos.y));
+        u64::azalea_write_var(&data, buf)?;
+        Ok(())
+    }
+}