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62bb429cbf
Also remove a duplicated `normalizedEncoding` function. These node compatibility tests are now passing: - [test-string-decoder-end.js](https://github.com/nodejs/node/blob/v24.2.0/test/parallel/test-string-decoder-end.js) - [test-string-decoder-fuzz.js](https://github.com/nodejs/node/blob/v24.2.0/test/parallel/test-string-decoder-fuzz.js)
79 lines
2.4 KiB
TypeScript
79 lines
2.4 KiB
TypeScript
// Copyright 2018-2025 the Deno authors. MIT license.
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import { primordials } from "ext:core/mod.js";
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const { StringPrototypeToLowerCase } = primordials;
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import type { TextEncodings } from "ext:deno_node/_utils.ts";
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// https://github.com/nodejs/node/blob/a73b575304722a3682fbec3a5fb13b39c5791342/lib/internal/util.js#L252
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export function normalizeEncoding(
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enc: string | null,
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): TextEncodings | undefined {
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if (enc == null || enc === "utf8" || enc === "utf-8") return "utf8";
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return slowCases(enc);
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}
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function slowCases(enc: string): TextEncodings | undefined {
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switch (enc.length) {
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case 4:
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if (enc === "UTF8") return "utf8";
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if (enc === "ucs2" || enc === "UCS2") return "utf16le";
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enc = StringPrototypeToLowerCase(`${enc}`);
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if (enc === "utf8") return "utf8";
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if (enc === "ucs2") return "utf16le";
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break;
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case 3:
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if (
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enc === "hex" || enc === "HEX" ||
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StringPrototypeToLowerCase(`${enc}`) === "hex"
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) {
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return "hex";
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}
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break;
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case 5:
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if (enc === "ascii") return "ascii";
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if (enc === "ucs-2") return "utf16le";
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if (enc === "UTF-8") return "utf8";
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if (enc === "ASCII") return "ascii";
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if (enc === "UCS-2") return "utf16le";
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enc = StringPrototypeToLowerCase(`${enc}`);
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if (enc === "utf-8") return "utf8";
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if (enc === "ascii") return "ascii";
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if (enc === "ucs-2") return "utf16le";
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break;
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case 6:
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if (enc === "base64") return "base64";
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if (enc === "latin1" || enc === "binary") return "latin1";
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if (enc === "BASE64") return "base64";
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if (enc === "LATIN1" || enc === "BINARY") return "latin1";
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enc = StringPrototypeToLowerCase(`${enc}`);
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if (enc === "base64") return "base64";
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if (enc === "latin1" || enc === "binary") return "latin1";
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break;
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case 7:
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if (
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enc === "utf16le" || enc === "UTF16LE" ||
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StringPrototypeToLowerCase(`${enc}`) === "utf16le"
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) {
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return "utf16le";
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}
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break;
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case 8:
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if (
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enc === "utf-16le" || enc === "UTF-16LE" ||
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StringPrototypeToLowerCase(`${enc}`) === "utf-16le"
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) {
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return "utf16le";
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}
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break;
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case 9:
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if (
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enc === "base64url" || enc === "BASE64URL" ||
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StringPrototypeToLowerCase(`${enc}`) === "base64url"
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) {
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return "base64url";
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}
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break;
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default:
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if (enc === "") return "utf8";
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}
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}
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