62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.createToBase64Bin = void 0;
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const constants_1 = require("./constants");
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const createToBase64Bin = (chars = constants_1.alphabet, pad = '=') => {
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if (chars.length !== 64)
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throw new Error('chars must be 64 characters long');
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const table = chars.split('').map((c) => c.charCodeAt(0));
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const table2 = [];
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for (const c1 of table) {
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for (const c2 of table) {
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const two = (c1 << 8) + c2;
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table2.push(two);
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}
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}
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const doAddPadding = pad.length === 1;
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const E = doAddPadding ? pad.charCodeAt(0) : 0;
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const EE = doAddPadding ? (E << 8) | E : 0;
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return (uint8, start, length, dest, offset) => {
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const extraLength = length % 3;
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const baseLength = length - extraLength;
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for (; start < baseLength; start += 3) {
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const o1 = uint8[start];
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const o2 = uint8[start + 1];
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const o3 = uint8[start + 2];
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const v1 = (o1 << 4) | (o2 >> 4);
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const v2 = ((o2 & 0b1111) << 8) | o3;
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dest.setInt32(offset, (table2[v1] << 16) + table2[v2]);
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offset += 4;
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}
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if (extraLength === 1) {
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const o1 = uint8[baseLength];
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if (doAddPadding) {
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dest.setInt32(offset, (table2[o1 << 4] << 16) + EE);
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offset += 4;
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}
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else {
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dest.setInt16(offset, table2[o1 << 4]);
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offset += 2;
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}
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}
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else if (extraLength) {
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const o1 = uint8[baseLength];
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const o2 = uint8[baseLength + 1];
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const v1 = (o1 << 4) | (o2 >> 4);
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const v2 = (o2 & 0b1111) << 2;
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if (doAddPadding) {
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dest.setInt32(offset, (table2[v1] << 16) + (table[v2] << 8) + E);
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offset += 4;
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}
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else {
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dest.setInt16(offset, table2[v1]);
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offset += 2;
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dest.setInt8(offset, table[v2]);
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offset += 1;
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}
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}
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return offset;
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};
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};
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exports.createToBase64Bin = createToBase64Bin;
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//# sourceMappingURL=createToBase64Bin.js.map
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