arbos/
block_metadata.rs

1/// Per-block metadata byte array.
2///
3/// Format: first byte is version (currently 0), subsequent bytes are
4/// bit-packed flags indicating which transactions were timeboosted.
5#[derive(Debug, Clone, Default)]
6pub struct BlockMetadata(pub Vec<u8>);
7
8impl BlockMetadata {
9    pub fn new(data: Vec<u8>) -> Self {
10        Self(data)
11    }
12
13    /// Returns whether the transaction at `tx_index` was timeboosted.
14    ///
15    /// Returns `None` if the metadata is empty or too short to cover the index.
16    pub fn is_tx_timeboosted(&self, tx_index: usize) -> Option<bool> {
17        if self.0.is_empty() {
18            return None;
19        }
20        // First byte is version, remaining bytes are bit flags.
21        let byte_index = 1 + tx_index / 8;
22        let bit_index = tx_index % 8;
23        if byte_index >= self.0.len() {
24            return Some(false);
25        }
26        Some(self.0[byte_index] & (1 << bit_index) != 0)
27    }
28}
arbos/block_metadata.rs

arbos/
block_metadata.rs
