might help to include unit.rs

src/entity/item/unit.rs

@@ -0,0 +1,60 @@
+use std::convert::{TryFrom, Into};
+
+pub enum UnitTypeError {
+    UnknownUnit(String)
+}
+
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum UnitType {
+    None
+}
+
+impl UnitType {
+    pub fn value(&self) -> [u8; 3] {
+        match self {
+            UnitType::None => [0; 3]
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum UnitModifier {
+    PlusPlus,
+    Plus,
+    Minus,
+    MinusMinus,
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct Unit {
+    pub unit: UnitType,
+    pub modifier: UnitModifier,
+}
+
+
+impl Unit {
+    pub fn as_bytes(&self) -> [u8; 16] {
+        let mut result = [0; 16];
+        result[0..3].copy_from_slice(&self.unit.value());
+
+        match self.modifier {
+            UnitModifier::PlusPlus => {
+                result[7] = 3;
+            },
+            UnitModifier::Plus => {
+                result[7] = 1;
+            },
+            UnitModifier::Minus => {
+                result[7] = 0xFF;
+                result[8] = 0xFF;
+            },
+            UnitModifier::MinusMinus => {
+                result[7] = 0xFE;
+                result[8] = 0xFF;
+            },
+        }
+
+        result
+    }
+}