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buffer: optimize byteLength for common encodings #54342

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Aug 14, 2024
Merged

buffer: optimize byteLength for common encodings #54342

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21 changes: 15 additions & 6 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -771,13 +771,22 @@ function byteLength(string, encoding) {
if (len === 0)
return 0;

if (encoding) {
const ops = getEncodingOps(encoding);
if (ops) {
return ops.byteLength(string);
}
if (!encoding || encoding === 'utf8') {
return byteLengthUtf8(string);
}

if (encoding === 'ascii') {
return len;
}
return byteLengthUtf8(string);

const ops = getEncodingOps(encoding);
if (ops === undefined) {
// TODO (ronag): Makes more sense to throw here.
// throw new ERR_UNKNOWN_ENCODING(encoding);
return byteLengthUtf8(string);
}

return ops.byteLength(string);
}

Buffer.byteLength = byteLength;
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