UTF-8 BOM Checker

cbom.go

// Check UTF-8 BOM
// go run cbom.go -path=hello.txt

package main
import(
	"flag"
	"os"
	"log"
	"fmt"
)

var (
     filename = flag.String("path","","filename")
)

func main(){
	flag.Parse()
	file, err := os.Open(*filename)
	if err != nil {
		log.Fatal(err)
	}
	data := make([]byte, 100)
	count, err := file.Read(data)
	if err != nil {
		log.Fatal(err)
	}
	if(count>3&& data[0] != 0xef || data[1] != 0xbb || data[2] != 0xbf){
		fmt.Printf("%s is not a UTF-8 file, or a UTF-8 file without BOM.\n",*filename);
	}else{
		//fmt.Printf("%x\n",data[0])
		//fmt.Printf("%x\n",data[1])
		//fmt.Printf("%x\n",data[2])
		fmt.Printf("%s is a UTF-8 file with BOM.\n",*filename);
	}
	//fmt.Printf("read %d bytes: %q\n", count, data[:count])
	defer file.Close()
}