Add From and TryFrom implementations for Data

Author: Abestanis

src/frame/data.rs

@@ -60,6 +60,40 @@ impl<'d> Data<'d> {
     }
 }
 
+/// The buffer has an invalid size (must be a non null multiple of 2).
+pub struct DataFromBufferError;
+
+impl<'buffer> TryFrom<&'buffer [u8]> for Data<'buffer> {
+    type Error = DataFromBufferError;
+
+    fn try_from(value: &'buffer [u8]) -> Result<Self, Self::Error> {
+        if value.is_empty() || value.len() % 2 != 0 {
+            Err(DataFromBufferError)
+        } else {
+            Ok(Self {
+                data: value,
+                quantity: value.len() / 2,
+            })
+        }
+    }
+}
+
+macro_rules! derive_from_for_data {
+    ($($buffer_length: literal)+) => {
+       $(
+            impl<'buffer> From<&'buffer [u8; $buffer_length]> for Data<'buffer> {
+                fn from(value: &'buffer [u8; $buffer_length]) -> Self {
+                    Self {
+                        data: value,
+                        quantity: $buffer_length / 2,
+                    }
+                }
+            }
+       )+
+    };
+}
+derive_from_for_data!(2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32);
+
 /// Data iterator
 // TODO: crate a generic iterator
 #[cfg_attr(all(feature = "defmt", target_os = "none"), derive(defmt::Format))]