Function decode_dod

nodedb-codec/src/double_delta.rs:243–269

(reader: &mut BitReader<'_>)

}

fn decode_dod(reader: &mut BitReader<'_>) -> Result<i64, CodecError> {
    let bit = reader.read_bit()?;
    if !bit {
        return Ok(0);
    }

    let bit2 = reader.read_bit()?;
    if !bit2 {
        let raw = reader.read_bits(7)? as i64;
        return Ok(sign_extend(raw, 7));
    }

    let bit3 = reader.read_bit()?;
    if !bit3 {
        let raw = reader.read_bits(9)? as i64;
        return Ok(sign_extend(raw, 9));
    }

    let bit4 = reader.read_bit()?;
    if !bit4 {
        let raw = reader.read_bits(12)? as i64;
        return Ok(sign_extend(raw, 12));
    }

    let raw = reader.read_bits(64)?;
    Ok(raw as i64)
}

fn sign_extend(value: i64, bits: u32) -> i64 {
    let shift = 64 - bits;