web0715/13.webpack/demo1/node_modules/@jsonjoy.com/base64/lib/createToBase64BinUint8.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createToBase64BinUint8 = void 0;
const constants_1 = require("./constants");
const createToBase64BinUint8 = (chars = constants_1.alphabet, pad = '=') => {
    if (chars.length !== 64)
        throw new Error('chars must be 64 characters long');
    const table = chars.split('').map((c) => c.charCodeAt(0));
    const table2 = [];
    for (const c1 of table) {
        for (const c2 of table) {
            const two = (c1 << 8) + c2;
            table2.push(two);
        }
    }
    const PAD = pad.length === 1 ? pad.charCodeAt(0) : 0;
    return (uint8, start, length, dest, offset) => {
        const extraLength = length % 3;
        const baseLength = length - extraLength;
        for (; start < baseLength; start += 3) {
            const o1 = uint8[start];
            const o2 = uint8[start + 1];
            const o3 = uint8[start + 2];
            const v1 = (o1 << 4) | (o2 >> 4);
            const v2 = ((o2 & 0b1111) << 8) | o3;
            let u16 = table2[v1];
            dest[offset++] = u16 >> 8;
            dest[offset++] = u16;
            u16 = table2[v2];
            dest[offset++] = u16 >> 8;
            dest[offset++] = u16;
        }
        if (extraLength === 1) {
            const o1 = uint8[baseLength];
            const u16 = table2[o1 << 4];
            dest[offset++] = u16 >> 8;
            dest[offset++] = u16;
            if (PAD) {
                dest[offset++] = PAD;
                dest[offset++] = PAD;
            }
        }
        else if (extraLength) {
            const o1 = uint8[baseLength];
            const o2 = uint8[baseLength + 1];
            const v1 = (o1 << 4) | (o2 >> 4);
            const v2 = (o2 & 0b1111) << 2;
            const u16 = table2[v1];
            dest[offset++] = u16 >> 8;
            dest[offset++] = u16;
            dest[offset++] = table[v2];
            if (PAD)
                dest[offset++] = PAD;
        }
        return offset;
    };
};
exports.createToBase64BinUint8 = createToBase64BinUint8;
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