ShiftJIS -> EUC-JP by golang

conversion.go

package conversion

import (
	"io"

	"golang.org/x/text/encoding/japanese"
	"golang.org/x/text/transform"
)

//Conversion
func Conversion(inStream io.Reader, outStream io.Writer) error {
	//read from stream (Shift-JIS to UTF-8)
	transform.NewReader(inStream, japanese.ShiftJIS.NewDecoder())
	
	//write to stream (UTF-8 to EUC-JP)
	transform.NewWriter(outStream, japanese.EUCJP.NewEncoder())
	
	//copy
	if _, err := io.Copy(writer, reader); err != nil {
		return err
	}
	return nil
}