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
134
135
136
137
138
139
140
141
142
143
144
145
146
|
'use strict';
require('../common');
const assert = require('assert');
const b = Buffer.allocUnsafe(1024);
const c = Buffer.allocUnsafe(512);
let cntr = 0;
{
// copy 512 bytes, from 0 to 512.
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c, 0, 0, 512);
assert.strictEqual(512, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy c into b, without specifying sourceEnd
b.fill(++cntr);
c.fill(++cntr);
const copied = c.copy(b, 0, 0);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[i]);
}
}
{
// copy c into b, without specifying sourceStart
b.fill(++cntr);
c.fill(++cntr);
const copied = c.copy(b, 0);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[i]);
}
}
{
// copy longer buffer b to shorter c without targetStart
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy starting near end of b to c
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c, 0, b.length - Math.floor(c.length / 2));
assert.strictEqual(Math.floor(c.length / 2), copied);
for (let i = 0; i < Math.floor(c.length / 2); i++) {
assert.strictEqual(b[b.length - Math.floor(c.length / 2) + i], c[i]);
}
for (let i = Math.floor(c.length / 2) + 1; i < c.length; i++) {
assert.strictEqual(c[c.length - 1], c[i]);
}
}
{
// try to copy 513 bytes, and check we don't overrun c
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c, 0, 0, 513);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy 768 bytes from b into b
b.fill(++cntr);
b.fill(++cntr, 256);
const copied = b.copy(b, 0, 256, 1024);
assert.strictEqual(768, copied);
for (let i = 0; i < b.length; i++) {
assert.strictEqual(cntr, b[i]);
}
}
// copy string longer than buffer length (failure will segfault)
const bb = Buffer.allocUnsafe(10);
bb.fill('hello crazy world');
// try to copy from before the beginning of b
assert.doesNotThrow(() => { b.copy(c, 0, 100, 10); });
// copy throws at negative sourceStart
assert.throws(function() {
Buffer.allocUnsafe(5).copy(Buffer.allocUnsafe(5), 0, -1);
}, RangeError);
{
// check sourceEnd resets to targetEnd if former is greater than the latter
b.fill(++cntr);
c.fill(++cntr);
b.copy(c, 0, 0, 1025);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
// throw with negative sourceEnd
assert.throws(() => b.copy(c, 0, 0, -1), RangeError);
// when sourceStart is greater than sourceEnd, zero copied
assert.strictEqual(b.copy(c, 0, 100, 10), 0);
// when targetStart > targetLength, zero copied
assert.strictEqual(b.copy(c, 512, 0, 10), 0);
// Test that the `target` can be a Uint8Array.
{
const d = new Uint8Array(c);
// copy 512 bytes, from 0 to 512.
b.fill(++cntr);
d.fill(++cntr);
const copied = b.copy(d, 0, 0, 512);
assert.strictEqual(512, copied);
for (let i = 0; i < d.length; i++) {
assert.strictEqual(b[i], d[i]);
}
}
// Test that the source can be a Uint8Array, too.
{
const e = new Uint8Array(b);
// copy 512 bytes, from 0 to 512.
e.fill(++cntr);
c.fill(++cntr);
const copied = Buffer.prototype.copy.call(e, c, 0, 0, 512);
assert.strictEqual(512, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(e[i], c[i]);
}
}
|
