Seeks UTF-8 BOM before reading CSV

trap_bom.go

package main

import (
  "io"
  "bytes"
)

var bom = []byte("\xef\xbb\xbf")

func trapBOM(rws io.ReadWriteSeeker) error {
	fileBom := make([]byte, len(bom))

	_, err := rws.Read(fileBom)
	if err != nil {
		return err
	}

	if bytes.Compare(bom, fileBom) != 0 {
		return nil
	}

	_, err = rws.Seek(int64(len(bom)), io.SeekStart)
	if err != nil {
		return err
	}

	return nil
}

func main() {
  	f, err := os.Open("file-wih-bom.csv")
	if err != nil {
		panic(err)
	}

	defer f.Close()

	err = trapBOM(f)
	if err != nil {
		panic(err)
	}

	records, err := csv.NewReader(r).ReadAll()
	if err != nil {
		panic(err)
	}
  
	fmt.Println(records)
}