1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
'use strict';
// Tests to verify doubles are correctly written
require('../common');
const assert = require('assert');
const buffer = Buffer.allocUnsafe(16);
buffer.writeDoubleBE(2.225073858507201e-308, 0);
buffer.writeDoubleLE(2.225073858507201e-308, 8);
assert.ok(buffer.equals(new Uint8Array([
0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f, 0x00
])));
buffer.writeDoubleBE(1.0000000000000004, 0);
buffer.writeDoubleLE(1.0000000000000004, 8);
assert.ok(buffer.equals(new Uint8Array([
0x3f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f
])));
buffer.writeDoubleBE(-2, 0);
buffer.writeDoubleLE(-2, 8);
assert.ok(buffer.equals(new Uint8Array([
0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0
])));
buffer.writeDoubleBE(1.7976931348623157e+308, 0);
buffer.writeDoubleLE(1.7976931348623157e+308, 8);
assert.ok(buffer.equals(new Uint8Array([
0x7f, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0x7f
])));
buffer.writeDoubleBE(0 * -1, 0);
buffer.writeDoubleLE(0 * -1, 8);
assert.ok(buffer.equals(new Uint8Array([
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
])));
buffer.writeDoubleBE(Infinity, 0);
buffer.writeDoubleLE(Infinity, 8);
assert.ok(buffer.equals(new Uint8Array([
0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x7F
])));
assert.strictEqual(buffer.readDoubleBE(0), Infinity);
assert.strictEqual(buffer.readDoubleLE(8), Infinity);
buffer.writeDoubleBE(-Infinity, 0);
buffer.writeDoubleLE(-Infinity, 8);
assert.ok(buffer.equals(new Uint8Array([
0xFF, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0xFF
])));
assert.strictEqual(buffer.readDoubleBE(0), -Infinity);
assert.strictEqual(buffer.readDoubleLE(8), -Infinity);
buffer.writeDoubleBE(NaN, 0);
buffer.writeDoubleLE(NaN, 8);
// JS only knows a single NaN but there exist two platform specific
// implementations. Therefore, allow both quiet and signalling NaNs.
if (buffer[1] === 0xF7) {
assert.ok(buffer.equals(new Uint8Array([
0x7F, 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0x7F
])));
} else {
assert.ok(buffer.equals(new Uint8Array([
0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x7F
])));
}
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
assert.ok(Number.isNaN(buffer.readDoubleLE(8)));
// OOB in writeDouble{LE,BE} should throw.
{
const small = Buffer.allocUnsafe(1);
['writeDoubleLE', 'writeDoubleBE'].forEach((fn) => {
// Verify that default offset works fine.
buffer[fn](23, undefined);
buffer[fn](23);
assert.throws(
() => small[fn](11.11, 0),
{
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
name: 'RangeError',
message: 'Attempt to access memory outside buffer bounds'
});
['', '0', null, {}, [], () => {}, true, false].forEach((off) => {
assert.throws(
() => small[fn](23, off),
{ code: 'ERR_INVALID_ARG_TYPE' });
});
[Infinity, -1, 9].forEach((offset) => {
assert.throws(
() => buffer[fn](23, offset),
{
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "offset" is out of range. ' +
`It must be >= 0 and <= 8. Received ${offset}`
});
});
[NaN, 1.01].forEach((offset) => {
assert.throws(
() => buffer[fn](42, offset),
{
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "offset" is out of range. ' +
`It must be an integer. Received ${offset}`
});
});
});
}
|
