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buffer: make byteLength work with Buffer correctly #4738

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buffer: make byteLength work with Buffer correctly #4738

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3 changes: 3 additions & 0 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -262,6 +262,9 @@ function base64ByteLength(str, bytes) {


function byteLength(string, encoding) {
if (string instanceof Buffer)
return string.length;

if (typeof string !== 'string')
string = '' + string;

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6 changes: 6 additions & 0 deletions test/parallel/test-buffer-bytelength.js
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Expand Up @@ -10,6 +10,12 @@ assert.equal(Buffer.byteLength(NaN, 'utf8'), 3);
assert.equal(Buffer.byteLength({}, 'binary'), 15);
assert.equal(Buffer.byteLength(), 9);

// buffer
var incomplete = new Buffer([0xe4, 0xb8, 0xad, 0xe6, 0x96]);
assert.equal(Buffer.byteLength(incomplete), 5);
var ascii = new Buffer('abc');
assert.equal(Buffer.byteLength(ascii), 3);

// special case: zero length string
assert.equal(Buffer.byteLength('', 'ascii'), 0);
assert.equal(Buffer.byteLength('', 'HeX'), 0);
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