1  // Copyright (c) 2019-2025 Alpha-Delta Network Inc.
  2  // This file is part of the deltavm 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 StatePath<N> {
 19      /// Reads the path from a buffer.
 20      fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
 21          // Read the version.
 22          let version = u8::read_le(&mut reader)?;
 23          // Ensure the version is valid.
 24          if version != 1 {
 25              return Err(error("Invalid state path version"));
 26          }
 27  
 28          // Read the state path.
 29          let global_state_root = N::StateRoot::read_le(&mut reader)?;
 30  
 31          let block_path = BlockPath::read_le(&mut reader)?;
 32          let block_hash = N::BlockHash::read_le(&mut reader)?;
 33          let previous_block_hash = N::BlockHash::read_le(&mut reader)?;
 34          let header_root = Field::read_le(&mut reader)?;
 35          let header_path = HeaderPath::read_le(&mut reader)?;
 36          let header_leaf = HeaderLeaf::read_le(&mut reader)?;
 37          let transactions_path = TransactionsPath::read_le(&mut reader)?;
 38  
 39          let transaction_id = FromBytes::read_le(&mut reader)?;
 40          let transaction_path = FromBytes::read_le(&mut reader)?;
 41          let transaction_leaf = FromBytes::read_le(&mut reader)?;
 42          let transition_root = Field::read_le(&mut reader)?;
 43          let tcm = FromBytes::read_le(&mut reader)?;
 44          let transition_path = FromBytes::read_le(&mut reader)?;
 45          let transition_leaf = FromBytes::read_le(&mut reader)?;
 46  
 47          // Construct the state path.
 48          Ok(Self::from(
 49              global_state_root,
 50              block_path,
 51              block_hash,
 52              previous_block_hash,
 53              header_root,
 54              header_path,
 55              header_leaf,
 56              transactions_path,
 57              transaction_id,
 58              transaction_path,
 59              transaction_leaf,
 60              transition_root,
 61              tcm,
 62              transition_path,
 63              transition_leaf,
 64          ))
 65      }
 66  }
 67  
 68  impl<N: Network> ToBytes for StatePath<N> {
 69      /// Writes the path to a buffer.
 70      fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
 71          // Write the version.
 72          1u8.write_le(&mut writer)?;
 73  
 74          // Write the state path.
 75          self.global_state_root.write_le(&mut writer)?;
 76  
 77          self.block_path.write_le(&mut writer)?;
 78          self.block_hash.write_le(&mut writer)?;
 79          self.previous_block_hash.write_le(&mut writer)?;
 80          self.header_root.write_le(&mut writer)?;
 81          self.header_path.write_le(&mut writer)?;
 82          self.header_leaf.write_le(&mut writer)?;
 83          self.transactions_path.write_le(&mut writer)?;
 84  
 85          self.transaction_id.write_le(&mut writer)?;
 86          self.transaction_path.write_le(&mut writer)?;
 87          self.transaction_leaf.write_le(&mut writer)?;
 88          self.transition_root.write_le(&mut writer)?;
 89          self.tcm.write_le(&mut writer)?;
 90          self.transition_path.write_le(&mut writer)?;
 91          self.transition_leaf.write_le(&mut writer)
 92      }
 93  }
 94  
 95  #[cfg(test)]
 96  mod tests {
 97      use super::*;
 98      use deltavm_console_network::MainnetV0;
 99  
100      type CurrentNetwork = MainnetV0;
101  
102      const ITERATIONS: usize = 100;
103  
104      #[test]
105      fn test_bytes() {
106          let mut rng = TestRng::default();
107  
108          for _ in 0..ITERATIONS {
109              // Sample the state path.
110              let expected =
111                  crate::state_path::test_helpers::sample_global_state_path::<CurrentNetwork>(None, &mut rng).unwrap();
112  
113              // Check the byte representation.
114              let expected_bytes = expected.to_bytes_le().unwrap();
115              assert_eq!(expected, StatePath::read_le(&expected_bytes[..]).unwrap());
116              assert!(StatePath::<CurrentNetwork>::read_le(&expected_bytes[1..]).is_err());
117          }
118      }
119  }