@chainsafe/bit-utils

bit-utils

Bitlist/Bitvector Utilities

Install

npm install @chainsafe/bit-utils

Examples

BitList

import {BitList} from "@chainsafe/bit-utils";

// A BitList is created from a Uint8Array bitfield and a length of bits
const list: BitList = BitList.fromBitfield(Buffer.from([3]), 3);
// Or a BitList can be deserialized from a Uint8Array bitfield with a padding bit marking the length
const list2: BitList = BitList.deserialize(Buffer.from([11]));

// get length of bits
const _bitLength = list.bitLength;
// set bit
list.setBit(0, true);
// get bit
list.getBit(0) === true;
// serialize bitlist (without padding bit)
const output: Uint8Array = list.toBitfield();
// serialize bitlist (with padding bit)
const output2: Uint8Array = list.serialize();

BitVector

import {BitVector} from "@chainsafe/bit-utils";

// A BitVector is created from a Uint8Array bitfield and a length of bits
const vector: BitVector = BitVector.fromBitfield(Buffer.from([3]), 3);

// get length of bits
const _bitLength = vector.bitLength;
// set bit
vector.setBit(0, true);
// get bit
vector.getBit(0) === true
// serialize bitvector (loses length information)
const output: Uint8Array = vector.toBitfield();

API

See our autogenerated API docs

License

Apache 2.0