读取CSV时如何指定编码格式？

I am writing a package to read CSV files in Go, and I need to open CSV files which may be coded in different formats (such as UTF8, Latin1 or others). Is there a way to specify the encoding format of the CSV file to read?

Package csv

import "encoding/csv"

func NewReader

func NewReader(r io.Reader) *Reader

NewReader returns a new Reader that reads from r.

Provide an io.Reader to csv.NewReader that maps the CSV file character set to Unicode UTF-8.

For example,

import (
    "encoding/csv"

    "golang.org/x/text/encoding/charmap"
)

file, err := os.Open(filename)
if err != nil {
    return err
}
defer file.Close()
rdr := csv.NewReader(charmap.ISO8859_15.NewDecoder().Reader(file))