multiformats/esm/src/bytes.js

Interface for multihash, multicodec, multibase and CID

const empty = new Uint8Array(0);
const toHex = d => d.reduce((hex, byte) => hex + byte.toString(16).padStart(2, '0'), '');
const fromHex = hex => {
  const hexes = hex.match(/../g);
  return hexes ? new Uint8Array(hexes.map(b => parseInt(b, 16))) : empty;
};
const equals = (aa, bb) => {
  if (aa === bb)
    return true;
  if (aa.byteLength !== bb.byteLength) {
    return false;
  }
  for (let ii = 0; ii < aa.byteLength; ii++) {
    if (aa[ii] !== bb[ii]) {
      return false;
    }
  }
  return true;
};
const coerce = o => {
  if (o instanceof Uint8Array && o.constructor.name === 'Uint8Array')
    return o;
  if (o instanceof ArrayBuffer)
    return new Uint8Array(o);
  if (ArrayBuffer.isView(o)) {
    return new Uint8Array(o.buffer, o.byteOffset, o.byteLength);
  }
  throw new Error('Unknown type, must be binary type');
};
const isBinary = o => o instanceof ArrayBuffer || ArrayBuffer.isView(o);
const fromString = str => new TextEncoder().encode(str);
const toString = b => new TextDecoder().decode(b);
export {
  equals,
  coerce,
  isBinary,
  fromHex,
  toHex,
  fromString,
  toString,
  empty
};