You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: timestamp.rs
    path of file: ./repos/cnosdb/tskv/src/tsm/codec
    
    the code of the file until where you have to start completion: use std::error::Error;

use integer_encoding::*;
use q_compress::{auto_compress, auto_decompress, DEFAULT_COMPRESSION_LEVEL};

use super::simple8b;
use crate::byte_utils::decode_be_i64;
use crate::tsm::codec::Encoding;

// note: encode/decode adapted from influxdb_iox
// https://github.com/influxdata/influxdb_iox/tree/main/influxdb_tsm/src/encoders

// Encoding describes the type of encoding used by an encoded timestamp block.
enum DeltaEncoding {
    Uncompressed = 0,
    Simple8b = 1,
    Rle = 2,
}

pub fn ts_without_compress_encode(
    src: &[i64],
    dst: &mut Vec<u8>,
) -> Result<(), Box<dyn Error + Send + Sync>> {
    if src.is_empty() {
        return Ok(());
    }
    dst.push(Encoding::Null as u8);

    for i in src.iter() {
        dst.extend_from_slice(i.to_be_bytes().as_slice());
    }
    Ok(())
}

pub fn ts_
    
fn decode_rle(src: &[u8], dst: &mut Vec<i64>) -> Result<(), Box<dyn Error + Send + Sync>> {
    if src.len() < 9 {
        return Err(From::from("not enough data to decode using RLE"));
    }

    // calculate the scaler from the lower 4 bits of the first byte.
    let scaler = 10_u64.pow((src[0] & 0b0000_1111) as u32);
    let mut i = 1;

    // TODO(edd): this should be possible to do in-place without copy.
    let mut a: [u8; 8] = [0; 8];
    a.copy_from_slice(&src[i..i + 8]);
    i += 8;
    let (mut delta, n) = u64::decode_var(&src[i..]).ok_or("unable to decode delta")?;
    i += n;
    delta *= scaler;

    let (count, _n) = usize::decode_var(&src[i..]).ok_or("unable to decode count")?;

    if dst.capacity() < count {
        dst.reserve_exact(count - dst.capacity());
    }

    let mut first = i64::from_be_bytes(a);
    for _ in 0..count {
        dst.push(first);
        first = first.wrapping_add(delta as i64);
    }
    Ok(())
}