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typed arrays: add Buffer -> TypedArray constructor
- create a typed array from a node::Buffer object - update TypedArray::set() to spec - add TypedArray::get() method
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// Copyright Joyent, Inc. and other Node contributors. | ||
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// Permission is hereby granted, free of charge, to any person obtaining a | ||
// copy of this software and associated documentation files (the | ||
// "Software"), to deal in the Software without restriction, including | ||
// without limitation the rights to use, copy, modify, merge, publish, | ||
// distribute, sublicense, and/or sell copies of the Software, and to permit | ||
// persons to whom the Software is furnished to do so, subject to the | ||
// following conditions: | ||
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// The above copyright notice and this permission notice shall be included | ||
// in all copies or substantial portions of the Software. | ||
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | ||
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN | ||
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, | ||
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | ||
// USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
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/* | ||
* Test to verify we are using Typed Arrays | ||
* (http://www.khronos.org/registry/typedarray/specs/latest/) correctly Test to | ||
* verify Buffer can used in Typed Arrays | ||
*/ | ||
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var assert = require('assert'); | ||
var SlowBuffer = process.binding('buffer').SlowBuffer; | ||
var ArrayBuffer = process.binding('typed_array').ArrayBuffer; | ||
var Int32Array = process.binding('typed_array').Int32Array; | ||
var Int16Array = process.binding('typed_array').Int16Array; | ||
var Uint8Array = process.binding('typed_array').Uint8Array; | ||
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function test(clazz) { | ||
var size = clazz.length; | ||
var b = clazz; | ||
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// create a view v1 referring to b, of type Int32, starting at | ||
// the default byte index (0) and extending until the end of the buffer | ||
var v1 = new Int32Array(b); | ||
assert(4, v1.BYTES_PER_ELEMENT); | ||
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// create a view v2 referring to b, of type Uint8, starting at | ||
// byte index 2 and extending until the end of the buffer | ||
var v2 = new Uint8Array(b, 2); | ||
assert(1, v1.BYTES_PER_ELEMENT); | ||
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// create a view v3 referring to b, of type Int16, starting at | ||
// byte index 2 and having a length of 2 | ||
var v3 = new Int16Array(b, 2, 2); | ||
assert(2, v1.BYTES_PER_ELEMENT); | ||
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// The layout is now | ||
// var index | ||
// b = |0|1|2|3|4|5|6|7| bytes (not indexable) | ||
// v1 = |0 |1 | indices (indexable) | ||
// v2 = |0|1|2|3|4|5| | ||
// v3 = |0 |1 | | ||
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// testing values | ||
v1[0] = 0x1234; | ||
v1[1] = 0x5678; | ||
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assert(0x1234, v1[0]); | ||
assert(0x5678, v1[1]); | ||
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assert(0x3, v2[0]); | ||
assert(0x4, v2[1]); | ||
assert(0x5, v2[2]); | ||
assert(0x6, v2[3]); | ||
assert(0x7, v2[4]); | ||
assert(0x8, v2[5]); | ||
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assert(0x34, v3[0]); | ||
assert(0x56, v3[1]); | ||
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// test get/set | ||
v2.set(1, 0x8); | ||
v2.set(2, 0xF); | ||
assert(0x8, v2.get(1)); | ||
assert(0xF, v2.get(2)); | ||
assert(0x38, v3.get(0)); | ||
assert(0xF6, v3.get(1)); | ||
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// test subarray | ||
var v4 = v1.subarray(1); | ||
assert(Int32Array, typeof v4); | ||
assert(0xF678, v4[0]); | ||
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// test set with typed array and [] | ||
v2.set([ 1, 2, 3, 4 ], 2); | ||
assert(0x1234, v1[0]); | ||
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var sub = new Int32Array(4); | ||
sub[0] = 0xabcd; | ||
v2.set(sub, 1); | ||
assert(0x3a, v3[0]); | ||
assert(0xbc, v3[1]); | ||
} | ||
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// basic Typed Arrays tests | ||
var size = 8; | ||
var ab = new ArrayBuffer(size); | ||
assert.equal(size, ab.byteLength); | ||
test(ab); | ||
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// testing sharing Buffer object | ||
var buffer = new Buffer(size); | ||
test(buffer); |