a collection of lightweight TypeScript packages for AT Protocol, the protocol powering Bluesky
atproto
bluesky
typescript
npm
refactor(multibase): faster base64 padding trim
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.changeset/yummy-frogs-allow.md
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.changeset/yummy-frogs-allow.md
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packages/utilities/multibase/lib/bases/base64-node.ts
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packages/utilities/multibase/lib/bases/base64-node.ts
···
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import { allocUnsafe } from '@atcute/uint8array';
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// `base64` has padding
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const _base64Slice = NodeBuffer.prototype.base64Slice;
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const _base64Write = NodeBuffer.prototype.base64Write;
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const _base64Slice = /*#__PURE__*/ NodeBuffer.prototype.base64Slice;
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const _base64Write = /*#__PURE__*/ NodeBuffer.prototype.base64Write;
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// `base64url` has no padding
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const _base64UrlSlice = NodeBuffer.prototype.base64urlSlice;
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const _base64UrlWrite = NodeBuffer.prototype.base64urlWrite;
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const _base64UrlSlice = /*#__PURE__*/ NodeBuffer.prototype.base64urlSlice;
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const _base64UrlWrite = /*#__PURE__*/ NodeBuffer.prototype.base64urlWrite;
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const getBase64ByteLength = (str: string, padded: boolean): number => {
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let length = str.length;
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return (length * 3) >>> 2;
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};
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const trimBase64Padding = (str: string): string => {
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const end = str.length - 1;
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if (str.charCodeAt(end) !== 0x3d) {
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return str;
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}
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+
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if (str.charCodeAt(end - 1) !== 0x3d) {
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return str.slice(0, end);
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}
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return str.slice(0, end - 1);
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};
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export const fromBase64 = (str: string): Uint8Array<ArrayBuffer> => {
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const length = getBase64ByteLength(str, false);
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const bytes = allocUnsafe(length);
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};
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export const toBase64 = (bytes: Uint8Array): string => {
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return _base64Slice.call(bytes).replaceAll('=', '');
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return trimBase64Padding(_base64Slice.call(bytes));
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};
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export const fromBase64Pad = (str: string): Uint8Array<ArrayBuffer> => {