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131 lines
3.4 KiB
131 lines
3.4 KiB
if (process.env.OBJECT_IMPL) global.TYPED_ARRAY_SUPPORT = false
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var B = require('../').Buffer
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var test = require('tape')
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var isnan = require('is-nan')
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test('buffer.write string should get parsed as number', function (t) {
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var b = new B(64)
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b.writeUInt16LE('1003', 0)
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t.equal(b.readUInt16LE(0), 1003)
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t.end()
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})
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test('buffer.writeUInt8 a fractional number will get Math.floored', function (t) {
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// Some extra work is necessary to make this test pass with the Object implementation
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var b = new B(1)
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b.writeInt8(5.5, 0)
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t.equal(b[0], 5)
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t.end()
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})
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test('writeUint8 with a negative number throws', function (t) {
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var buf = new B(1)
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t.throws(function () {
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buf.writeUInt8(-3, 0)
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})
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t.end()
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})
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test('hex of write{Uint,Int}{8,16,32}{LE,BE}', function (t) {
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t.plan(2 * (2 * 2 * 2 + 2))
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var hex = [
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'03', '0300', '0003', '03000000', '00000003',
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'fd', 'fdff', 'fffd', 'fdffffff', 'fffffffd'
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]
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var reads = [ 3, 3, 3, 3, 3, -3, -3, -3, -3, -3 ]
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var xs = ['UInt', 'Int']
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var ys = [8, 16, 32]
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for (var i = 0; i < xs.length; i++) {
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var x = xs[i]
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for (var j = 0; j < ys.length; j++) {
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var y = ys[j]
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var endianesses = (y === 8) ? [''] : ['LE', 'BE']
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for (var k = 0; k < endianesses.length; k++) {
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var z = endianesses[k]
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var v1 = new B(y / 8)
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var writefn = 'write' + x + y + z
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var val = (x === 'Int') ? -3 : 3
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v1[writefn](val, 0)
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t.equal(
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v1.toString('hex'),
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hex.shift()
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)
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var readfn = 'read' + x + y + z
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t.equal(
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v1[readfn](0),
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reads.shift()
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)
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}
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}
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}
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t.end()
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})
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test('hex of write{Uint,Int}{8,16,32}{LE,BE} with overflow', function (t) {
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if (!B.TYPED_ARRAY_SUPPORT) {
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t.pass('object impl: skipping overflow test')
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t.end()
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return
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}
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t.plan(3 * (2 * 2 * 2 + 2))
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var hex = [
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'', '03', '00', '030000', '000000',
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'', 'fd', 'ff', 'fdffff', 'ffffff'
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]
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var reads = [
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undefined, 3, 0, NaN, 0,
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undefined, 253, -256, 16777213, -256
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]
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var xs = ['UInt', 'Int']
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var ys = [8, 16, 32]
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for (var i = 0; i < xs.length; i++) {
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var x = xs[i]
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for (var j = 0; j < ys.length; j++) {
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var y = ys[j]
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var endianesses = (y === 8) ? [''] : ['LE', 'BE']
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for (var k = 0; k < endianesses.length; k++) {
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var z = endianesses[k]
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var v1 = new B(y / 8 - 1)
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var next = new B(4)
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next.writeUInt32BE(0, 0)
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var writefn = 'write' + x + y + z
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var val = (x === 'Int') ? -3 : 3
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v1[writefn](val, 0, true)
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t.equal(
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v1.toString('hex'),
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hex.shift()
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)
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// check that nothing leaked to next buffer.
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t.equal(next.readUInt32BE(0), 0)
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// check that no bytes are read from next buffer.
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next.writeInt32BE(~0, 0)
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var readfn = 'read' + x + y + z
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var r = reads.shift()
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if (isnan(r)) t.pass('equal')
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else t.equal(v1[readfn](0, true), r)
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}
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}
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}
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t.end()
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})
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test('large values do not improperly roll over (ref #80)', function (t) {
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var nums = [-25589992, -633756690, -898146932]
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var out = new B(12)
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out.fill(0)
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out.writeInt32BE(nums[0], 0)
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var newNum = out.readInt32BE(0)
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t.equal(nums[0], newNum)
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out.writeInt32BE(nums[1], 4)
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newNum = out.readInt32BE(4)
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t.equal(nums[1], newNum)
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out.writeInt32BE(nums[2], 8)
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newNum = out.readInt32BE(8)
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t.equal(nums[2], newNum)
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t.end()
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})
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