59 lines
2.1 KiB
JavaScript
59 lines
2.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.createToBase64BinUint8 = void 0;
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const constants_1 = require("./constants");
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const createToBase64BinUint8 = (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 PAD = pad.length === 1 ? pad.charCodeAt(0) : 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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let u16 = table2[v1];
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dest[offset++] = u16 >> 8;
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dest[offset++] = u16;
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u16 = table2[v2];
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dest[offset++] = u16 >> 8;
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dest[offset++] = u16;
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}
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if (extraLength === 1) {
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const o1 = uint8[baseLength];
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const u16 = table2[o1 << 4];
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dest[offset++] = u16 >> 8;
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dest[offset++] = u16;
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if (PAD) {
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dest[offset++] = PAD;
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dest[offset++] = PAD;
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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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const u16 = table2[v1];
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dest[offset++] = u16 >> 8;
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dest[offset++] = u16;
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dest[offset++] = table[v2];
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if (PAD)
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dest[offset++] = PAD;
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}
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return offset;
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};
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};
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exports.createToBase64BinUint8 = createToBase64BinUint8;
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//# sourceMappingURL=createToBase64BinUint8.js.map
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