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> ToFields for Plaintext<N> {
19      type Field = Field<N>;
20  
21      /// Returns this plaintext as a list of field elements.
22      fn to_fields(&self) -> Result<Vec<Self::Field>> {
23          // Encode the data as little-endian bits.
24          let mut bits_le = self.to_bits_le();
25          // Adds one final bit to the data, to serve as a terminus indicator.
26          // During decryption, this final bit ensures we've reached the end.
27          bits_le.push(true);
28          // Pack the bits into field elements.
29          let fields = bits_le
30              .chunks(Field::<N>::size_in_data_bits())
31              .map(Field::<N>::from_bits_le)
32              .collect::<Result<Vec<_>>>()?;
33          // Ensure the number of field elements does not exceed the maximum allowed size.
34          match fields.len() <= N::MAX_DATA_SIZE_IN_FIELDS as usize {
35              true => Ok(fields),
36              false => bail!("Plaintext exceeds maximum allowed size"),
37          }
38      }
39  }