@iden3/js-merkletree/dist/node/esm/lib/utils/merkletree.js

javascript sparse merkle tree library

// const siblingBytes = bs.slice(this.notEmpties.length + PROOF_FLAG_LEN);
import { HASH_BYTES_LENGTH } from '../../constants';
import { testBit } from './bytes';
export const getPath = (numLevels, k) => {
    const path = new Array(numLevels);
    for (let idx = 0; idx < numLevels; idx += 1) {
        path[idx] = testBit(k, idx);
    }
    return path;
};
export const siblings2Bytes = (siblings) => {
    const siblingBytesBuff = new ArrayBuffer(HASH_BYTES_LENGTH * siblings.length);
    const siblingBytes = new Uint8Array(siblingBytesBuff);
    siblings.forEach((v, i) => {
        siblingBytes.set(v.value, i * HASH_BYTES_LENGTH);
    });
    return siblingBytes;
};