snarkvm-compiler 0.9.0

// Copyright (C) 2019-2022 Aleo Systems Inc.
// This file is part of the snarkVM library.

// The snarkVM library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The snarkVM library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the snarkVM library. If not, see <https://www.gnu.org/licenses/>.

use super::*;

impl<N: Network> FromBytes for Header<N> {
    /// Reads the block header from the buffer.
    #[inline]
    fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
        // Read the version.
        let version = u16::read_le(&mut reader)?;
        // Ensure the version is valid.
        if version != 0 {
            return Err(error("Invalid header version"));
        }

        // Read from the buffer.
        let previous_state_root = Field::<N>::read_le(&mut reader)?;
        let transactions_root = Field::<N>::read_le(&mut reader)?;
        let metadata = Metadata::read_le(&mut reader)?;

        // Construct the block header.
        Self::from(previous_state_root, transactions_root, metadata).map_err(|e| error(e.to_string()))
    }
}

impl<N: Network> ToBytes for Header<N> {
    /// Writes the block header to the buffer.
    #[inline]
    fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
        // Write the version.
        0u16.write_le(&mut writer)?;

        // Write to the buffer.
        self.previous_state_root.write_le(&mut writer)?;
        self.transactions_root.write_le(&mut writer)?;
        self.metadata.write_le(&mut writer)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use console::network::Testnet3;

    type CurrentNetwork = Testnet3;

    #[test]
    fn test_bytes() -> Result<()> {
        for expected in [*crate::ledger::test_helpers::sample_genesis_block().header()].into_iter() {
            // Check the byte representation.
            let expected_bytes = expected.to_bytes_le()?;
            assert_eq!(expected, Header::read_le(&expected_bytes[..])?);
            assert!(Header::<CurrentNetwork>::read_le(&expected_bytes[1..]).is_err());
        }
        Ok(())
    }
}