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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// TODO(petamoriken): enable prefer-primordials for node polyfills
// deno-lint-ignore-file prefer-primordials
export function normalizeEncoding(enc) {
if (enc == null || enc === "utf8" || enc === "utf-8") return "utf8";
return slowCases(enc);
}
export function slowCases(enc) {
switch (enc.length) {
case 4:
if (enc === "UTF8") return "utf8";
if (enc === "ucs2" || enc === "UCS2") return "utf16le";
enc = `${enc}`.toLowerCase();
if (enc === "utf8") return "utf8";
if (enc === "ucs2") return "utf16le";
break;
case 3:
if (
enc === "hex" || enc === "HEX" ||
`${enc}`.toLowerCase() === "hex"
) {
return "hex";
}
break;
case 5:
if (enc === "ascii") return "ascii";
if (enc === "ucs-2") return "utf16le";
if (enc === "UTF-8") return "utf8";
if (enc === "ASCII") return "ascii";
if (enc === "UCS-2") return "utf16le";
enc = `${enc}`.toLowerCase();
if (enc === "utf-8") return "utf8";
if (enc === "ascii") return "ascii";
if (enc === "ucs-2") return "utf16le";
break;
case 6:
if (enc === "base64") return "base64";
if (enc === "latin1" || enc === "binary") return "latin1";
if (enc === "BASE64") return "base64";
if (enc === "LATIN1" || enc === "BINARY") return "latin1";
enc = `${enc}`.toLowerCase();
if (enc === "base64") return "base64";
if (enc === "latin1" || enc === "binary") return "latin1";
break;
case 7:
if (
enc === "utf16le" || enc === "UTF16LE" ||
`${enc}`.toLowerCase() === "utf16le"
) {
return "utf16le";
}
break;
case 8:
if (
enc === "utf-16le" || enc === "UTF-16LE" ||
`${enc}`.toLowerCase() === "utf-16le"
) {
return "utf16le";
}
break;
case 9:
if (
enc === "base64url" || enc === "BASE64URL" ||
`${enc}`.toLowerCase() === "base64url"
) {
return "base64url";
}
break;
default:
if (enc === "") return "utf8";
}
}
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