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encoding.go
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package utils
import (
"fmt"
"os"
"strings"
"golang.org/x/text/encoding"
"golang.org/x/text/encoding/japanese"
"golang.org/x/text/encoding/korean"
"golang.org/x/text/encoding/simplifiedchinese"
"golang.org/x/text/encoding/traditionalchinese"
"golang.org/x/text/encoding/unicode"
"golang.org/x/text/encoding/charmap"
)
var charMaps = map[string]encoding.Encoding{
"codepage037": charmap.CodePage037,
"codepage1047": charmap.CodePage1047,
"codepage1140": charmap.CodePage1140,
"codepage437": charmap.CodePage437,
"codepage850": charmap.CodePage850,
"codepage852": charmap.CodePage852,
"codepage855": charmap.CodePage855,
"codepage858": charmap.CodePage858,
"codepage860": charmap.CodePage860,
"codepage862": charmap.CodePage862,
"codepage863": charmap.CodePage863,
"codepage865": charmap.CodePage865,
"codepage866": charmap.CodePage866,
"iso8859_1": charmap.ISO8859_1,
"iso8859_10": charmap.ISO8859_10,
"iso8859_13": charmap.ISO8859_13,
"iso8859_14": charmap.ISO8859_14,
"iso8859_15": charmap.ISO8859_15,
"iso8859_16": charmap.ISO8859_16,
"iso8859_2": charmap.ISO8859_2,
"iso8859_3": charmap.ISO8859_3,
"iso8859_4": charmap.ISO8859_4,
"iso8859_5": charmap.ISO8859_5,
"iso8859_6": charmap.ISO8859_6,
"iso8859_7": charmap.ISO8859_7,
"iso8859_8": charmap.ISO8859_8,
"iso8859_9": charmap.ISO8859_9,
"koi8r": charmap.KOI8R,
"koi8u": charmap.KOI8U,
"macintosh": charmap.Macintosh,
"macintoshcyrillic": charmap.MacintoshCyrillic,
"windows1250": charmap.Windows1250,
"windows1251": charmap.Windows1251,
"windows1252": charmap.Windows1252,
"windows1253": charmap.Windows1253,
"windows1254": charmap.Windows1254,
"windows1255": charmap.Windows1255,
"windows1256": charmap.Windows1256,
"windows1257": charmap.Windows1257,
"windows1258": charmap.Windows1258,
"windows874": charmap.Windows874,
"gb18030": simplifiedchinese.GB18030,
"gbk": simplifiedchinese.GBK,
"big5": traditionalchinese.Big5,
"eucjp": japanese.EUCJP,
"iso2022jp": japanese.ISO2022JP,
"shiftJIS": japanese.ShiftJIS,
"euckr": korean.EUCKR,
"utf16be": unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM),
"utf16le": unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM),
"utf8": nil,
"utf-8": nil,
}
func Encode(encodingName, contentsUtf8 string) ([]byte, error) {
cm, err := DetectCharMap(encodingName)
if err != nil {
return []byte{}, err
}
if cm == nil {
return []byte(contentsUtf8), nil
}
enc := cm.NewEncoder()
out, err := enc.String(contentsUtf8)
return []byte(out), err
}
func Decode(encodingName string, data []byte) (string, error) {
cm, err := DetectCharMap(encodingName)
if err != nil {
return "", err
}
if cm == nil {
return string(data), nil
}
enc := cm.NewDecoder()
out, err := enc.Bytes(data)
return string(out), err
}
func DetectCharMap(encodingName string) (encoding.Encoding, error) {
cm, ok := charMaps[strings.ToLower(encodingName)]
if !ok {
return nil, fmt.Errorf("unknown encoding: '%s'", encodingName)
}
return cm, nil
}
func WriteEncodedFile(encodingName, contentsUtf8, fileName string, perm os.FileMode) error {
encodedData, err := Encode(encodingName, contentsUtf8)
if err != nil {
return err
}
return os.WriteFile(fileName, encodedData, perm)
}
func ReadEncodedFile(encodingName, fileName string) (contentsUtf8 string, err error) {
contents, err := os.ReadFile(fileName)
if err != nil {
return
}
return Decode(encodingName, contents)
}