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Implement Buffer.copyBytesFrom #348

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@chjj chjj commented Feb 3, 2024

Implements Buffer.copyBytesFrom.

Also fixes a bug with ERR_INVALID_ARG_TYPE.

Comment on lines +258 to +280
if (offset !== undefined || length !== undefined) {
if (offset !== undefined) {
validateInteger(offset, 'offset')
if (offset >= view.length) return createBuffer(0)
} else {
offset = 0
}

let end

if (length !== undefined) {
validateInteger(length, 'length')
end = offset + length
} else {
end = view.length
}

view = view.subarray(offset, end)
}

view = new Uint8Array(view.buffer, view.byteOffset, view.byteLength)

return fromArrayView(view)
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@dcousens dcousens Feb 11, 2024

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Suggested change
if (offset !== undefined || length !== undefined) {
if (offset !== undefined) {
validateInteger(offset, 'offset')
if (offset >= view.length) return createBuffer(0)
} else {
offset = 0
}
let end
if (length !== undefined) {
validateInteger(length, 'length')
end = offset + length
} else {
end = view.length
}
view = view.subarray(offset, end)
}
view = new Uint8Array(view.buffer, view.byteOffset, view.byteLength)
return fromArrayView(view)
if (offset !== undefined || length !== undefined) {
if (offset !== undefined) validateInteger(offset, 'offset')
if (length !== undefined) validateInteger(length, 'length')
const offset_ = offset ?? 0
if (offset_ >= view.length) return createBuffer(0)
const end = offset_ + (length ?? view.length)
view = view.subarray(offset_, end)
}
view = new Uint8Array(view.buffer, view.byteOffset, view.byteLength)
return fromArrayView(view)

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@dcousens dcousens Feb 11, 2024

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Generally, a preference for flat (preferably functional) style, even if the actual number of resulting branches is the same

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This code was ported from the node.js code as faithfully as possible to ensure accurate behavior. I can change it though.

While we're on the subject: what is the minimum ES version we support? Since the ?? operator is an ES2020 feature, it would be good to have clarity on that. BigInt is also an ES2020 feature, but we include graceful degradation for the bigint methods.

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@dcousens dcousens left a comment

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LGTM, with a nit

u16[0] = 0;
assert.strictEqual(b16.length, 2);
assert.strictEqual(b16[0], 255);
assert.strictEqual(b16[1], 255);
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How are semi's here? 🤔
Shouldn't the linter break on this?

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@dcousens dcousens Feb 11, 2024

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(no changes required, we can resolve this in another pull request)

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@chjj chjj Mar 1, 2024

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I think it's because I pulled these directly from the node.js tests. Maybe we don't lint the node tests?

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@dcousens dcousens Mar 1, 2024

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If these are directly from the node tests, can you add an please add a reference?
(and adhere to whatever LICENSE notice may be required if this is a copy)

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@chjj chjj Mar 1, 2024

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Is that not already accounted for? As far as I can tell, all of the tests in test/node are ripped straight from the node.js codebase, right down to the filenames. I even recognize these ones -- I wrote them. 😊

edit: Okay, after looking, I guess it isn't accounted for. Should I add a the node.js LICENSE file inside the test/node directory, or should I concatenate the existing LICENSE file with the node.js one?

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@dcousens dcousens Mar 2, 2024

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Thanks for hunting that down @chjj, everything should be MIT, so hopefully any effort here is simply about proper attribution.
I think an inline URL would be helpful too so others can verify the tests against the upstream

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2 participants