forked from fight100year/golearn
/
buffer.go
74 lines (61 loc) · 1.02 KB
/
buffer.go
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
package main
import (
"fmt"
"math/rand"
"os"
"strconv"
)
func random(min, max int) int {
return rand.Intn(max-min) + min
}
func createBuffer(buf *[]byte, cnt int) {
if cnt == 0 {
return
}
for i := 0; i < cnt; i++ {
if len(*buf) > cnt {
return
}
*buf = append(*buf, byte(random(0, 100)))
}
}
func create(dst string, b, f int) error {
_, err := os.Stat(dst)
if err == nil {
return fmt.Errorf("file %s already exists. ", dst)
}
file, err := os.Create(dst)
if err != nil {
return err
}
defer file.Close()
buf := make([]byte, 0)
for {
createBuffer(&buf, b)
buf = buf[:b]
if _, err := file.Write(buf); err != nil {
return err
}
if f < 0 {
break
}
f = f - len(buf)
}
return err
}
func main() {
if len(os.Args) != 3 {
return
}
file := "output.file"
bufferSize, _ := strconv.Atoi(os.Args[1])
fileSize, _ := strconv.Atoi(os.Args[2])
err := create(file, bufferSize, fileSize)
if err != nil {
fmt.Println(err)
}
err = os.Remove(file)
if err != nil {
fmt.Println(err)
}
}