Function encode_delta_fastlanes_rans

nodedb-codec/src/pipeline.rs:303–316

Delta → FastLanes → rANS: i64 cold tier.

(values: &[i64])

/// Delta → FastLanes → rANS: i64 cold tier.
fn encode_delta_fastlanes_rans(values: &[i64]) -> Result<Vec<u8>, CodecError> {
    if values.is_empty() {
        return Ok(crate::rans::encode(&crate::fastlanes::encode(&[])));
    }

    let mut deltas = Vec::with_capacity(values.len());
    deltas.push(values[0]);
    for i in 1..values.len() {
        deltas.push(values[i].wrapping_sub(values[i - 1]));
    }

    let packed = crate::fastlanes::encode(&deltas);
    Ok(crate::rans::encode(&packed))
}

fn decode_delta_fastlanes_rans(data: &[u8]) -> Result<Vec<i64>, CodecError> {
    let packed = crate::rans::decode(data)?;