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
|
/*
* Tests to verify we're reading in doubles correctly
*/
var ASSERT = require('assert');
/*
* Test (64 bit) double
*/
function test() {
var buffer = new Buffer(8);
buffer[0] = 0x55;
buffer[1] = 0x55;
buffer[2] = 0x55;
buffer[3] = 0x55;
buffer[4] = 0x55;
buffer[5] = 0x55;
buffer[6] = 0xd5;
buffer[7] = 0x3f;
ASSERT.equal(1.1945305291680097e+103, buffer.readDouble(0, 'big'));
ASSERT.equal(0.3333333333333333, buffer.readDouble(0, 'little'));
buffer[0] = 1;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0xf0;
buffer[7] = 0x3f;
ASSERT.equal(7.291122019655968e-304, buffer.readDouble(0, 'big'));
ASSERT.equal(1.0000000000000002, buffer.readDouble(0, 'little'));
buffer[0] = 2;
ASSERT.equal(4.778309726801735e-299, buffer.readDouble(0, 'big'));
ASSERT.equal(1.0000000000000004, buffer.readDouble(0, 'little'));
buffer[0] = 1;
buffer[6] = 0;
buffer[7] = 0;
ASSERT.equal(7.291122019556398e-304, buffer.readDouble(0, 'big'));
ASSERT.equal(5e-324, buffer.readDouble(0, 'little'));
buffer[0] = 0xff;
buffer[1] = 0xff;
buffer[2] = 0xff;
buffer[3] = 0xff;
buffer[4] = 0xff;
buffer[5] = 0xff;
buffer[6] = 0x0f;
buffer[7] = 0x00;
ASSERT.ok(isNaN(buffer.readDouble(0, 'big')));
ASSERT.equal(2.225073858507201e-308, buffer.readDouble(0, 'little'));
buffer[6] = 0xef;
buffer[7] = 0x7f;
ASSERT.ok(isNaN(buffer.readDouble(0, 'big')));
ASSERT.equal(1.7976931348623157e+308, buffer.readDouble(0, 'little'));
buffer[0] = 0;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0xf0;
buffer[7] = 0x3f;
ASSERT.equal(3.03865e-319, buffer.readDouble(0, 'big'));
ASSERT.equal(1, buffer.readDouble(0, 'little'));
buffer[6] = 0;
buffer[7] = 0x40;
ASSERT.equal(3.16e-322, buffer.readDouble(0, 'big'));
ASSERT.equal(2, buffer.readDouble(0, 'little'));
buffer[7] = 0xc0;
ASSERT.equal(9.5e-322, buffer.readDouble(0, 'big'));
ASSERT.equal(-2, buffer.readDouble(0, 'little'));
buffer[6] = 0x10;
buffer[7] = 0;
ASSERT.equal(2.0237e-320, buffer.readDouble(0, 'big'));
ASSERT.equal(2.2250738585072014e-308, buffer.readDouble(0, 'little'));
buffer[6] = 0;
ASSERT.equal(0, buffer.readDouble(0, 'big'));
ASSERT.equal(0, buffer.readDouble(0, 'little'));
ASSERT.equal(false, 1/buffer.readDouble(0, 'little')<0);
buffer[7] = 0x80;
ASSERT.equal(6.3e-322, buffer.readDouble(0, 'big'));
ASSERT.equal(0, buffer.readDouble(0, 'little'));
ASSERT.equal(true, 1/buffer.readDouble(0, 'little')<0);
buffer[6] = 0xf0;
buffer[7] = 0x7f;
ASSERT.equal(3.0418e-319, buffer.readDouble(0, 'big'));
ASSERT.equal(Infinity, buffer.readDouble(0, 'little'));
buffer[6] = 0xf0;
buffer[7] = 0xff;
ASSERT.equal(3.04814e-319, buffer.readDouble(0, 'big'));
ASSERT.equal(-Infinity, buffer.readDouble(0, 'little'));
}
test();
|
