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// Copyright (c) 2019-2026 Provable Inc.
// This file is part of the snarkVM library.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use super::*;
impl<N: Network> ToBits for Plaintext<N> {
/// Returns this plaintext as a list of **little-endian** bits.
fn write_bits_le(&self, vec: &mut Vec<bool>) {
match self {
Self::Literal(literal, bits_le) => {
// Compute the bits.
let bits = bits_le.get_or_init(|| {
let mut bits_le = PlaintextType::<N>::LITERAL_PREFIX_BITS.to_vec(); // Variant bits.
literal.variant().write_bits_le(&mut bits_le);
literal.size_in_bits().write_bits_le(&mut bits_le);
literal.write_bits_le(&mut bits_le);
bits_le
});
// Extend the vector with the bits.
vec.extend_from_slice(bits)
}
Self::Struct(struct_, bits_le) => {
// Compute the bits.
let bits = bits_le.get_or_init(|| {
let mut bits_le = PlaintextType::<N>::STRUCT_PREFIX_BITS.to_vec(); // Variant bits.
// Write the length of the struct.
u8::try_from(struct_.len())
.or_halt_with::<N>("Plaintext struct length exceeds u8::MAX")
.write_bits_le(&mut bits_le);
// Write each member of the struct.
for (identifier, value) in struct_ {
// Write the identifier of the member.
identifier.size_in_bits().write_bits_le(&mut bits_le);
identifier.write_bits_le(&mut bits_le);
// Write the value of the member.
let value_bits = value.to_bits_le();
u16::try_from(value_bits.len())
.or_halt_with::<N>("Plaintext member exceeds u16::MAX bits")
.write_bits_le(&mut bits_le);
bits_le.extend_from_slice(&value_bits);
}
bits_le
});
// Extend the vector with the bits.
vec.extend_from_slice(bits)
}
Self::Array(array, bits_le) => {
// Compute the bits.
let bits = bits_le.get_or_init(|| {
let mut bits_le = PlaintextType::<N>::ARRAY_PREFIX_BITS.to_vec(); // Variant bits.
// Write the length of the array.
u32::try_from(array.len())
.or_halt_with::<N>("Plaintext array length exceeds u32::MAX")
.write_bits_le(&mut bits_le);
// Write each element of the array.
for element in array {
let element_bits = element.to_bits_le();
// Write the size of the element.
u16::try_from(element_bits.len())
.or_halt_with::<N>("Plaintext element exceeds u16::MAX bits")
.write_bits_le(&mut bits_le);
// Write the element.
bits_le.extend(element_bits);
}
bits_le
});
// Extend the vector with the bits.
vec.extend_from_slice(bits)
}
}
}
/// Returns this plaintext as a list of **big-endian** bits.
fn write_bits_be(&self, vec: &mut Vec<bool>) {
match self {
Self::Literal(literal, bits_be) => {
// Compute the bits.
let bits = bits_be.get_or_init(|| {
let mut bits_be = PlaintextType::<N>::LITERAL_PREFIX_BITS.to_vec(); // Variant bits.
literal.variant().write_bits_be(&mut bits_be);
literal.size_in_bits().write_bits_be(&mut bits_be);
literal.write_bits_be(&mut bits_be);
bits_be
});
// Extend the vector with the bits.
vec.extend_from_slice(bits)
}
Self::Struct(struct_, bits_be) => {
// Compute the bits.
let bits = bits_be.get_or_init(|| {
let mut bits_be = PlaintextType::<N>::STRUCT_PREFIX_BITS.to_vec(); // Variant bits.
// Write the length of the struct.
u8::try_from(struct_.len())
.or_halt_with::<N>("Plaintext struct length exceeds u8::MAX")
.write_bits_be(&mut bits_be);
// Write each member of the struct.
for (identifier, value) in struct_ {
// Write the identifier of the member.
identifier.size_in_bits().write_bits_be(&mut bits_be);
identifier.write_bits_be(&mut bits_be);
// Write the value of the member.
let value_bits = value.to_bits_be();
u16::try_from(value_bits.len())
.or_halt_with::<N>("Plaintext member exceeds u16::MAX bits")
.write_bits_be(&mut bits_be);
bits_be.extend_from_slice(&value_bits);
}
bits_be
});
// Extend the vector with the bits.
vec.extend_from_slice(bits)
}
Self::Array(array, bits_be) => {
// Compute the bits.
let bits = bits_be.get_or_init(|| {
let mut bits_be = PlaintextType::<N>::ARRAY_PREFIX_BITS.to_vec(); // Variant bits.
// Write the length of the array.
u32::try_from(array.len())
.or_halt_with::<N>("Plaintext array length exceeds u32::MAX")
.write_bits_be(&mut bits_be);
// Write each element of the array.
for element in array {
let element_bits = element.to_bits_be();
// Write the size of the element.
u16::try_from(element_bits.len())
.or_halt_with::<N>("Plaintext element exceeds u16::MAX bits")
.write_bits_be(&mut bits_be);
// Write the element.
bits_be.extend(element_bits);
}
bits_be
});
// Extend the vector with the bits.
vec.extend_from_slice(bits)
}
}
}
}