Crate delta_encoding

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:

1, 3, 2, 4, 5

the delta-encoded stream would be:

1, 2, -1, 2, 1

Usage

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

• This project is easier to develop with just, a modern alternative to make. Install it with cargo install just.
• To get a list of available commands, run just.
• To run tests, use just test.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Structs

DeltaDecoder

Construct a delta-decoder

DeltaDecoderIter

A utility struct to construct a delta-decoder sequence from an iterator.

DeltaEncoder

Construct a delta-encoder

DeltaEncoderIter

A utility struct to construct a delta-encoded sequence from an iterator.

Traits

DeltaDecoderExt

DeltaEncoderExt