This project is part of the @thi.ng/umbrella monorepo.

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Binary range encoder / decoder, based on Java implementation by Joe Halliwell.

STABLE - used in production

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• @thi.ng/bitstream - ES6 iterator based read/write bit streams with support for variable word widths
• @thi.ng/rle-pack - Binary run-length encoding packer w/ flexible repeat bit widths

yarn add @thi.ng/range-coder

ES module import:

<script type="module" src="https://cdn.skypack.dev/@thi.ng/range-coder"></script>

Skypack documentation

For Node.js REPL:

const rangeCoder = await import("@thi.ng/range-coder");

Package sizes (brotli'd, pre-treeshake): ESM: 618 bytes

• @thi.ng/bitstream

Generated API docs

import * as rc "@thi.ng/range-coder";

// prepare dummy data
src = new Uint8Array(1024);
src.set([1,1,1,1,1,2,2,2,2,3,3,3,4,4,5,4,4,3,3,3,2,2,2,2,1,1,1,1,1], 512);

// pack data
packed = rc.encodeBytes(src);

packed.length
// 146

packed.length/src.length
// 0.142578125

// unpack
dest = rc.decodeBytes(packed);

• Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

@misc{thing-range-coder,
  title = "@thi.ng/range-coder",
  author = "Karsten Schmidt",
  note = "https://thi.ng/range-coder",
  year = 2017
}

© 2017 - 2023 Karsten Schmidt // Apache License 2.0