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【GO】文件分割

作者:heishui / 发布于2014/8/12/ 754


	import (
	 // "bufio"
	 "flag"
	 "fmt"
	 "io"
	 "os"
	)
	
	import "strconv"
	
	var infile *string = flag.String("f", "Null", "please input a file name or dir.")
	var size *string = flag.String("s", "0", "please input a dst file size.")
	
	//func dataCopy(file *os.File, file *os.File)
	
	func SplitFile(file *os.File, size int) {
	 finfo, err := file.Stat()
	 if err != nil {
	 fmt.Println("get file info failed:", file, size)
	 }
	
	 fmt.Println(finfo, size)
	
	 //每次最多拷贝1m
	 bufsize := 1024 * 1024
	 if size < bufsize {
	 bufsize = size
	 }
	
	 buf := make([]byte, bufsize)
	
	 num := (int(finfo.Size()) + size - 1) / size
	 fmt.Println(num, len(buf))
	
	 for i := 0; i < num; i++ {
	 copylen := 0
	 newfilename := finfo.Name() + strconv.Itoa(i)
	 newfile, err1 := os.Create(newfilename)
	 if err1 != nil {
	 fmt.Println("failed to create file", newfilename)
	 } else {
	 fmt.Println("create file:", newfilename)
	 }
	
	 for copylen < size {
	 n, err2 := file.Read(buf)
	 if err2 != nil && err2 != io.EOF {
	 fmt.Println(err2, "failed to read from:", file)
	 break
	 }
	
	 if n <= 0 {
	 break
	 }
	
	 //fmt.Println(n, len(buf))
	
	 //写文件
	 w_buf := buf[:n]
	 newfile.Write(w_buf)
	 copylen += n
	 }
	 }
	
	 return
	}
	
	func main() {
	 flag.Parse()
	
	 if *infile == "Null" {
	 fmt.Println("no file to input")
	 return
	 }
	
	 file, err := os.Open(*infile)
	 if err != nil {
	 fmt.Println("failed to open:", *infile)
	 }
	
	 defer file.Close()
	
	 size, _ := strconv.Atoi(*size)
	
	 SplitFile(file, size*1024)
	
	}

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