1  // Copyright (c) 2019-2025 Alpha-Delta Network Inc.
 2  // This file is part of the alphavm library.
 3  
 4  // Licensed under the Apache License, Version 2.0 (the "License");
 5  // you may not use this file except in compliance with the License.
 6  // You may obtain a copy of the License at:
 7  
 8  // http://www.apache.org/licenses/LICENSE-2.0
 9  
10  // Unless required by applicable law or agreed to in writing, software
11  // distributed under the License is distributed on an "AS IS" BASIS,
12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  // See the License for the specific language governing permissions and
14  // limitations under the License.
15  
16  use super::*;
17  
18  impl<N: Network> FromBytes for TransitionLeaf<N> {
19      /// Reads the transition leaf from a buffer.
20      fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
21          // Read the version.
22          let version = FromBytes::read_le(&mut reader)?;
23          // Ensure the version is valid.
24          if version != TRANSITION_LEAF_VERSION {
25              return Err(error("Invalid transition leaf version"));
26          }
27          // Read the index.
28          let index = FromBytes::read_le(&mut reader)?;
29          // Read the variant.
30          let variant = FromBytes::read_le(&mut reader)?;
31          // Read the ID.
32          let id = FromBytes::read_le(&mut reader)?;
33          // Return the transition leaf.
34          Ok(Self::from(version, index, variant, id))
35      }
36  }
37  
38  impl<N: Network> ToBytes for TransitionLeaf<N> {
39      /// Writes the transition leaf to a buffer.
40      fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
41          // Write the version.
42          self.version.write_le(&mut writer)?;
43          // Write the index.
44          self.index.write_le(&mut writer)?;
45          // Write the variant.
46          self.variant.write_le(&mut writer)?;
47          // Write the ID.
48          self.id.write_le(&mut writer)
49      }
50  }
51  
52  #[cfg(test)]
53  mod tests {
54      use super::*;
55  
56      const ITERATIONS: u64 = 1000;
57  
58      #[test]
59      fn test_bytes() -> Result<()> {
60          let mut rng = TestRng::default();
61  
62          for _ in 0..ITERATIONS {
63              // Sample the leaf.
64              let expected = test_helpers::sample_leaf(&mut rng);
65  
66              // Check the byte representation.
67              let expected_bytes = expected.to_bytes_le()?;
68              assert_eq!(expected, TransitionLeaf::read_le(&expected_bytes[..])?);
69          }
70          Ok(())
71      }
72  }