From ddf3a7981cfed5f660c77ab25d01d8577827c4f0 Mon Sep 17 00:00:00 2001
From: Thinkofname <thinkofdeath@spigotmc.org>
Date: Fri, 18 Mar 2016 22:24:30 +0000
Subject: [PATCH] Base implementation for worlds/blocks

---
 protocol/src/macros.rs        | 25 +++++++++++++++++++
 protocol/src/types/bit/map.rs |  4 ++--
 protocol/src/types/mod.rs     |  1 +
 protocol/src/types/nibble.rs  | 45 +++++++++++++++++++++++++++++++++++
 4 files changed, 73 insertions(+), 2 deletions(-)
 create mode 100644 protocol/src/macros.rs
 create mode 100644 protocol/src/types/nibble.rs

diff --git a/protocol/src/macros.rs b/protocol/src/macros.rs
new file mode 100644
index 0000000..bf2b7a2
--- /dev/null
+++ b/protocol/src/macros.rs
@@ -0,0 +1,25 @@
+
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! create_ids {
+    ($t:ty, ) => ();
+    ($t:ty, prev($prev:ident), $name:ident) => (
+        #[allow(non_upper_case_globals)]
+        pub const $name: $t = $prev + 1;
+    );
+    ($t:ty, prev($prev:ident), $name:ident, $($n:ident),+) => (
+        #[allow(non_upper_case_globals)]
+        pub const $name: $t = $prev + 1;
+        create_ids!($t, prev($name), $($n),+);
+    );
+    ($t:ty, $name:ident, $($n:ident),+) => (
+        #[allow(non_upper_case_globals)]
+        pub const $name: $t = 0;
+        create_ids!($t, prev($name), $($n),+);
+    );
+    ($t:ty, $name:ident) => (
+        #[allow(non_upper_case_globals)]
+        pub const $name: $t = 0;
+    );
+}
diff --git a/protocol/src/types/bit/map.rs b/protocol/src/types/bit/map.rs
index 15136a9..a847bb3 100644
--- a/protocol/src/types/bit/map.rs
+++ b/protocol/src/types/bit/map.rs
@@ -14,7 +14,7 @@
 
 pub struct Map {
     bits: Vec<u64>,
-    bit_size: usize,
+    pub bit_size: usize,
     length: usize,
 }
 
@@ -60,7 +60,7 @@ impl Map {
         map
     }
 
-    pub fn resize(self, size: usize) -> Map {
+    pub fn resize(&self, size: usize) -> Map {
         let mut n = Map::new(self.length, size);
         for i in 0..self.length {
             n.set(i, self.get(i));
diff --git a/protocol/src/types/mod.rs b/protocol/src/types/mod.rs
index 11e4d7c..682180e 100644
--- a/protocol/src/types/mod.rs
+++ b/protocol/src/types/mod.rs
@@ -19,3 +19,4 @@ mod metadata;
 pub use self::metadata::*;
 
 pub mod bit;
+pub mod nibble;
diff --git a/protocol/src/types/nibble.rs b/protocol/src/types/nibble.rs
new file mode 100644
index 0000000..1b62d2e
--- /dev/null
+++ b/protocol/src/types/nibble.rs
@@ -0,0 +1,45 @@
+// Copyright 2015 Matthew Collins
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+pub struct Array {
+    data: Vec<u8>,
+}
+
+impl Array {
+    pub fn new(size: usize) -> Array {
+        Array {
+            data: vec![0; (size + 1) >> 1],
+        }
+    }
+
+    pub fn get(&self, idx: usize) -> u8 {
+        let val = self.data[idx>>1];
+        if idx&1 == 0 {
+            val & 0xF
+        } else {
+            val >> 4
+        }
+    }
+
+    pub fn set(&mut self, idx: usize, val: u8) {
+        let i = idx >> 1;
+        let old = self.data[i];
+        if idx&1 == 0 {
+            self.data[i] = (old & 0xF0) | (val & 0xF);
+        } else {
+            self.data[i] = (old & 0x0F) | ((val & 0xF) << 4);
+        }
+    }
+}