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