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