mary.my.id / atcute
a collection of lightweight TypeScript packages for AT Protocol, the protocol powering Bluesky
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atcute / packages / utilities / varint / README.md
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mary.my.id refactor(varint)!: faster varint decode
4bd4ff04

@atcute/varint#

protobuf-style LEB128 varint codec.

npm install @atcute/varint

import { encode, decode, encodingLength } from '@atcute/varint';

// encoding
const encoded: number[] = [];
const bytesWritten = encode(420, encoded);
// -> encoded: [164, 3]
// -> bytesWritten: 2

// decoding
const { value, nextOffset } = decode(encoded);
// -> value: 420
// -> nextOffset: 2

// check encoding length beforehand
encodingLength(420); // -> 2
encodingLength(16383); // -> 2
encodingLength(16384); // -> 3