Delta-Encoding library

A simple library for encoding and decoding a stream of values as delta-encoded. For example, if you have a stream of values like this:

text 1, 3, 2, 4, 5

the delta-encoded stream would be:

text 1, 2, -1, 2, 1

Usage

```rust use delta_encoding::{DeltaEncoderExt, DeltaDecoderExt};

pub fn main() { let data = vec![1, 2, 5, 4, 2];

// Delta-encode without consuming, and without making a vector copy
let encoded: Vec<i64> = data.iter().copied().deltas().collect();
assert_eq!(encoded, vec![1, 1, 3, -1, -2]);

// Consume and delta-encode
let encoded: Vec<i64> = data.into_iter().deltas().collect();
assert_eq!(encoded, vec![1, 1, 3, -1, -2]);

let data = vec![1, 1, 3, -1, -2];

// Delta-decode without consuming, and without making a vector copy
let decoded: Vec<i64> = data.iter().copied().original().collect();
assert_eq!(decoded, vec![1, 2, 5, 4, 2]);

// Consume and delta-decode
let decoded: Vec<i64> = data.into_iter().original().collect();
assert_eq!(decoded, vec![1, 2, 5, 4, 2]);

} ```

Development

All of these must succeed: bash cargo test # Testing cargo bench # Benchmarking cargo fmt # Code format cargo clippy # Code lints