1  // Copyright (c) 2025-2026 ACDC Network
 2  // This file is part of the alphavm library.
 3  //
 4  // Alpha Chain | Delta Chain Protocol
 5  // International Monetary Graphite.
 6  //
 7  // Derived from Aleo (https://aleo.org) and ProvableHQ (https://provable.com).
 8  // They built world-class ZK infrastructure. We installed the EASY button.
 9  // Their cryptography: elegant. Our modifications: bureaucracy-compatible.
10  // Original brilliance: theirs. Robert's Rules: ours. Bugs: definitely ours.
11  //
12  // Original Aleo/ProvableHQ code subject to Apache 2.0 https://www.apache.org/licenses/LICENSE-2.0
13  // All modifications and new work: CC0 1.0 Universal Public Domain Dedication.
14  // No rights reserved. No permission required. No warranty. No refunds.
15  //
16  // https://creativecommons.org/publicdomain/zero/1.0/
17  // SPDX-License-Identifier: CC0-1.0
18  
19  use super::*;
20  
21  impl<N: Network> Visibility for Plaintext<N> {
22      type Boolean = Boolean<N>;
23  
24      /// Returns the number of field elements to encode `self`.
25      fn size_in_fields(&self) -> Result<u16> {
26          // Compute the number of bits.
27          let num_bits = self.to_bits_le().len() + 1; // 1 extra bit for the terminus indicator.
28                                                      // Compute the ceiling division of the number of bits by the number of bits in a field element.
29          let num_fields = num_bits.div_ceil(Field::<N>::size_in_data_bits());
30          // Ensure the number of field elements does not exceed the maximum allowed size.
31          match num_fields <= N::MAX_DATA_SIZE_IN_FIELDS as usize {
32              // Return the number of field elements.
33              true => Ok(u16::try_from(num_fields).or_halt_with::<N>("Plaintext exceeds u16::MAX field elements.")),
34              false => bail!("Plaintext cannot exceed {} field elements.", N::MAX_DATA_SIZE_IN_FIELDS),
35          }
36      }
37  }