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81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
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var assert = require('assert')
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var weak = require('weak')
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var ref = require('../')
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describe('pointer', function () {
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var test = new Buffer('hello world')
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beforeEach(gc)
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it('should write and read back a pointer (Buffer) in a Buffer', function () {
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var buf = new Buffer(ref.sizeof.pointer)
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ref.writePointer(buf, 0, test)
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var out = ref.readPointer(buf, 0, test.length)
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assert.strictEqual(out.length, test.length)
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for (var i = 0, l = out.length; i < l; i++) {
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assert.strictEqual(out[i], test[i])
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}
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assert.strictEqual(ref.address(out), ref.address(test))
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})
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it('should retain references to a written pointer in a Buffer', function (done) {
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var child_gc = false
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var parent_gc = false
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var child = new Buffer('a pointer holding some data...')
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var parent = new Buffer(ref.sizeof.pointer)
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weak(child, function () { child_gc = true })
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weak(parent, function () { parent_gc = true })
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ref.writePointer(parent, 0, child)
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assert(!child_gc, '"child" has been garbage collected too soon')
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assert(!parent_gc, '"parent" has been garbage collected too soon')
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// try to GC `child`
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child = null
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gc()
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assert(!child_gc, '"child" has been garbage collected too soon')
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assert(!parent_gc, '"parent" has been garbage collected too soon')
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// now GC `parent`
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parent = null
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setImmediate(function () {
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gc()
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assert(parent_gc, '"parent" has not been garbage collected')
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assert(child_gc, '"child" has not been garbage collected')
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done()
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});
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})
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it('should throw an Error when reading from the NULL pointer', function () {
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assert.throws(function () {
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ref.NULL.readPointer()
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})
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})
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it('should return a 0-length Buffer when reading a NULL pointer', function () {
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var buf = new Buffer(ref.sizeof.pointer)
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ref.writePointer(buf, 0, ref.NULL)
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var out = ref.readPointer(buf, 0, 100)
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assert.strictEqual(out.length, 0)
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})
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describe('offset', function () {
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it('should read two pointers next to each other in memory', function () {
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var buf = new Buffer(ref.sizeof.pointer * 2)
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var a = new Buffer('hello')
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var b = new Buffer('world')
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buf.writePointer(a, 0 * ref.sizeof.pointer)
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buf.writePointer(b, 1 * ref.sizeof.pointer)
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var _a = buf.readPointer(0 * ref.sizeof.pointer)
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var _b = buf.readPointer(1 * ref.sizeof.pointer)
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assert.equal(a.address(), _a.address())
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assert.equal(b.address(), _b.address())
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})
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})
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})
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