shc_toNumericQr.js

shc_toNumericQr.js

const SMALLEST_B64_CHAR_CODE = 45; // "-".charCodeAt(0) === 45
const toNumericQr = (jws: string, chunkIndex: number, totalChunks: number): QRCodeSegment[] => [
  { data: 'shc:/' + ((totalChunks > 1) ? `${chunkIndex + 1}/${totalChunks}/` : ``), mode: 'byte' },
  {
    data: jws
      .split('')
      .map((c) => c.charCodeAt(0) - SMALLEST_B64_CHAR_CODE)
      .flatMap((c) => [Math.floor(c / 10), c % 10])
      .join(''),
    mode: 'numeric',
  },
];