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fs: accept all valid utf8 values in fast paths #64341

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fs: accept all valid utf8 values in fast paths #64341

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14 changes: 10 additions & 4 deletions lib/fs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,13 @@ const {
O_SYMLINK,
} = constants;

function isUtf8Encoding(encoding) {
return encoding === 'utf8' ||
encoding === 'utf-8' ||
encoding === 'UTF8' ||
encoding === 'UTF-8';
}

const pathModule = require('path');
const { isArrayBufferView } = require('internal/util/types');

Expand Down Expand Up @@ -611,8 +618,7 @@ function readFileSync(path, options) {
validateReadFileBufferOptions(options);
const hasUserBuffer = options.buffer !== undefined;

if ((options.encoding === 'utf8' || options.encoding === 'utf-8') &&
!hasUserBuffer) {
if (isUtf8Encoding(options.encoding) && !hasUserBuffer) {
if (isInt32(path)) {
// V8 does not report -0 as an int32, so it would reach the binding as a
// path instead of a file descriptor.
Expand Down Expand Up @@ -3015,7 +3021,7 @@ function writeFileSync(path, data, options) {
const flag = options.flag || 'w';

// C++ fast path for string data and UTF8 encoding
if (typeof data === 'string' && (options.encoding === 'utf8' || options.encoding === 'utf-8')) {
if (typeof data === 'string' && isUtf8Encoding(options.encoding)) {
if (isInt32(path)) {
// V8 does not report -0 as an int32, so it would reach the binding as a
// path instead of a file descriptor.
Expand Down Expand Up @@ -3320,7 +3326,7 @@ if (isWindows) {
}

function encodeRealpathResult(result, options) {
if (!options || !options.encoding || options.encoding === 'utf8')
if (!options || !options.encoding || isUtf8Encoding(options.encoding))
return result;
const asBuffer = Buffer.from(result);
if (options.encoding === 'buffer') {
Expand Down
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