qrloop/lib/Buffer.js

Envelop big blob of data into frames that can be displayed in series of QR Codes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.xor = exports.cutAndPad = void 0;
const buffer_1 = require("buffer");
function cutAndPad(data, size) {
    const numChunks = Math.ceil(data.length / size);
    const chunks = new Array(numChunks);
    for (let i = 0, o = 0; i < numChunks; ++i, o += size) {
        chunks[i] = data.slice(o, o + size);
    }
    const last = numChunks - 1;
    const pad = size - chunks[last].length;
    if (pad > 0) {
        chunks[last] = buffer_1.Buffer.concat([
            chunks[last],
            buffer_1.Buffer.from(Array(pad).fill(0)),
        ]);
    }
    return chunks;
}
exports.cutAndPad = cutAndPad;
function xor(buffers) {
    const result = buffer_1.Buffer.from(buffers[0]);
    for (let i = 1; i < buffers.length; ++i) {
        const buffer = buffers[i];
        for (let j = 0; j < buffer.length; ++j) {
            result[j] ^= buffer[j];
        }
    }
    return result;
}
exports.xor = xor;
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