Golang による文字エンコーディング変換

// All is a list of all defined encodings in this package.
var All = []encoding.Encoding{EUCJP, ISO2022JP, ShiftJIS}

C:>go get -v golang.org/x/text/encoding/japanese
Fetching https://golang.org/x/text/encoding/japanese?go-get=1
Parsing meta tags from https://golang.org/x/text/encoding/japanese?go-get=1 (status code 200)
get "golang.org/x/text/encoding/japanese": found meta tag main.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text/encoding/japanese?go-get=1
get "golang.org/x/text/encoding/japanese": verifying non-authoritative meta tag
Fetching https://golang.org/x/text?go-get=1
Parsing meta tags from https://golang.org/x/text?go-get=1 (status code 200)
golang.org/x/text (download)
golang.org/x/text/transform
golang.org/x/text/encoding/internal/identifier
golang.org/x/text/encoding
golang.org/x/text/encoding/internal
golang.org/x/text/encoding/japanese

package main

import (
    "bufio"
    "fmt"
    "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)
    scanner := bufio.NewScanner(transform.NewReader(inStream, japanese.ShiftJIS.NewDecoder()))
    list := make([]string, 0)
    for scanner.Scan() {
        list = append(list, scanner.Text())
    }
    if err := scanner.Err(); err != nil {
        return err
    }
    //write to stream (UTF-8 to EUC-JP)
    writer := bufio.NewWriter(transform.NewWriter(outStream, japanese.EUCJP.NewEncoder()))
    for _, line := range list {
        _, err = fmt.Fprintln(writer, line)
        if err != nil {
            return err
        }
    }
    return writer.Flush()
}