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marcan2020/shc_toNumericQr.js

Created May 20, 2021 14:52
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shc_toNumericQr.js
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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',
},
];
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