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buffer: fix fill with encoding in Buffer.alloc() #9238

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buffer: fix fill with encoding in Buffer.alloc() #9238

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c31be42
buffer: fix `fill` with encoding in Buffer.alloc()
not-an-aardvark Oct 22, 2016
275b17b
squash: use Buffer.from
not-an-aardvark Oct 22, 2016
54c9dad
squash: link to GitHub issue in comment
not-an-aardvark Oct 22, 2016
90af46a
squash: ensure Buffer.alloc is inlineable
not-an-aardvark Oct 22, 2016
baad1f6
squash: fix comment typo
not-an-aardvark Oct 22, 2016
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6 changes: 5 additions & 1 deletion lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,11 @@ Buffer.alloc = function(size, fill, encoding) {
if (typeof fill !== 'number' && typeof encoding === 'string')
fill = Buffer.from(fill, encoding);

return createBuffer(size, true).fill(fill);
const buf = createBuffer(size, true);
// Buffer.prototype.fill does not support filling with other buffers in v4.
// Instead, call binding.fill directly.
binding.fill(buf, fill, 0, buf.length);
return buf;
}
return createBuffer(size);
};
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11 changes: 11 additions & 0 deletions test/parallel/test-buffer-alloc.js
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Expand Up @@ -1060,6 +1060,17 @@ assert.throws(function() {
Buffer.allocUnsafe(0xFFFFFFFFF);
}, RangeError);

// issue GH-9226
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I think it might be better to provide a URL instead (or at least in addition).

{
const buf = Buffer.alloc(4, 'YQ==', 'base64');
const expectedBuf = new Buffer([97, 97, 97, 97]);
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Can't this be Buffer.from() instead?

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Good idea; I had been under the impression that Buffer.from() had different behavior in v4, but it seems like that's not an issue here.

assert(buf.equals(expectedBuf));
}
{
const buf = Buffer.alloc(4, 'ab', 'ascii');
const expectedBuf = new Buffer([97, 98, 97, 98]);
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Ditto

assert(buf.equals(expectedBuf));
}

// attempt to overflow buffers, similar to previous bug in array buffers
assert.throws(function() {
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