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buffer: refactor to remove some duplicated code in fromObject. #4948

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buffer: refactor to remove some duplicated code in fromObject. #4948

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88f2a9f
buffer: refactor to remove some duplicated code in fromObject.
entertainyou Jan 29, 2016
cdaa4ea
fixup! buffer: refactor to remove some duplicated code in fromObject.
entertainyou Jan 31, 2016
c5a886b
fixup! buffer: refactor to remove some duplicated code in fromObject.
entertainyou Feb 1, 2016
e97323d
fixup! buffer: refactor to remove some duplicated code in fromObject.
entertainyou Feb 1, 2016
980f208
fixup! fixup! buffer: refactor to remove some duplicated code in from…
entertainyou Feb 1, 2016
ab15735
fixup! fixup! fixup! buffer: refactor to remove some duplicated code …
entertainyou Feb 1, 2016
e16e88b
fixup! fixup! fixup! fixup! buffer: refactor to remove some duplicate…
entertainyou Feb 1, 2016
b274fe1
fixup! fixup! fixup! fixup! fixup! buffer: refactor to remove some du…
entertainyou Feb 2, 2016
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36 changes: 13 additions & 23 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,13 @@ function fromString(string, encoding) {
return b;
}

function fromArrayLike(obj) {
const length = obj.length;
const b = allocate(length);
for (let i = 0; i < length; i++)
b[i] = obj[i] & 255;
return b;
}

function fromObject(obj) {
if (obj instanceof Buffer) {
Expand All @@ -134,14 +141,6 @@ function fromObject(obj) {
return b;
}

if (Array.isArray(obj)) {
const length = obj.length;
const b = allocate(length);
for (let i = 0; i < length; i++)
b[i] = obj[i] & 255;
return b;
}

if (obj == null) {
throw new TypeError('Must start with number, buffer, array or string');
}
Expand All @@ -150,25 +149,16 @@ function fromObject(obj) {
return binding.createFromArrayBuffer(obj);
}

if (obj.buffer instanceof ArrayBuffer || obj.length) {
let length;
if (typeof obj.length !== 'number' || obj.length !== obj.length)
length = 0;
else
length = obj.length;
const b = allocate(length);
for (let i = 0; i < length; i++) {
b[i] = obj[i] & 255;
if (obj.buffer instanceof ArrayBuffer || 'length' in obj) {
if (typeof obj.length !== 'number' || obj.length !== obj.length) {
return allocate(0);
} else {
return fromArrayLike(obj);
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just an aside, all typed arrays could be more quickly handled in C++, but that doesn't concern this PR. at least now it's centralized and will be easier to make the change. :)

}
return b;
}

if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
var array = obj.data;
const b = allocate(array.length);
for (let i = 0; i < array.length; i++)
b[i] = array[i] & 255;
return b;
return fromArrayLike(obj.data);
}

throw new TypeError('Must start with number, buffer, array or string');
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7 changes: 7 additions & 0 deletions test/parallel/test-buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,13 @@ var c = new Buffer(512);
console.log('c.length == %d', c.length);
assert.strictEqual(512, c.length);

var d = new Buffer([]);
assert.strictEqual(0, d.length);

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Can you also add the following:

var ui32 = new Uint32Array(4).fill(42);
var b = Buffer(ui32);
assert.deepEqual(ui32, b);

This is a test that should have been added previously, so is not technically part of this PR, but might as well add it since we're here.

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@trevnorris , test is added.

var ui32 = new Uint32Array(4).fill(42);
var e = Buffer(ui32);
assert.deepEqual(ui32, e);

// First check Buffer#fill() works as expected.

assert.throws(function() {
Expand Down