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table.go
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table.go
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package table
import (
"bufio"
"fmt"
"math/rand"
"os"
)
var BUFFERSIZE int
var FILESIZE int
func random(min, max int) int {
return rand.Intn(max-min) + min
}
func CreateBuffer(buf *[]byte, count int) {
*buf = make([]byte, count)
if count == 0 {
return
}
for i := 0; i < count; i++ {
intByte := byte(random(50, 100))
if len(*buf) > count {
return
}
*buf = append(*buf, intByte)
}
}
func Create(dst string, b, filesize int) error {
_, err := os.Stat(dst)
if err == nil {
return fmt.Errorf("File %s already exists.", dst)
}
f, err := os.Create(dst)
if err != nil {
fmt.Printf("error opening file %s", err)
return err
}
f.Close()
f, err = os.OpenFile(dst, os.O_WRONLY, 0655)
if err != nil {
return err
}
defer f.Close()
bwriter := bufio.NewWriterSize(f, b)
if err != nil {
return err
}
buf := make([]byte, 0)
CreateBuffer(&buf, b)
buf = buf[:b]
for {
_, err := bwriter.Write(buf)
if err != nil {
return err
}
if filesize < 0 {
break
}
filesize = filesize - len(buf)
}
return err
}
func CountChars(filename string, b int) int {
buf := make([]byte, 0)
CreateBuffer(&buf, b)
f, err := os.Open(filename)
if err != nil {
fmt.Printf("error opening file %s", err)
return -1
}
defer f.Close()
size := 0
for {
n, err := f.Read(buf)
size = size + n
if err != nil {
break
}
}
return size
}