node-delta

An efficient delta compression algorithm for Node.js, written in C. (see original source code)

Requires NodeJS v4 or higher

Usage

const fossilDelta = require('node-delta');

Creating delta between origin and target buffer:

var origin = new Buffer([1,2,3,4]);
var target = new Buffer([1,2,3,4,5,6]);
var delta = fossilDelta.create(origin, target);

Applying the delta:

var origin = new Buffer([1,2,3,4]);
var target = fossilDelta.apply(origin, delta);

Benchmarks

For creating the patch, node-delta has the best results. (roughly ~2x speed)

(create) node-delta x 313,371 ops/sec ±1.76% (77 runs sampled)
(create) fossil-delta x 238,424 ops/sec ±3.58% (75 runs sampled)

For applying the patch, fossil-delta-js still have the best results.

(apply) node-delta x 664,472 ops/sec ±5.44% (69 runs sampled)
(apply) fossil-delta x 860,541 ops/sec ±1.57% (84 runs sampled)

References

• Fossil Delta Format
• Pure JavaScript port
• C# port

License

MIT