commit 02d0a1162b03ffa7511c46a31d6f26ba513f07f9
Author: amorozov <amorozov@tswf.io>
Date:   Mon Sep 16 15:32:22 2024 +0300

    initial commit

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..6c3e415
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module git.tswf.io/incredible-go/incredible-go-core-text-encoding
+
+go 1.20
+
+require (
+	github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394
+	golang.org/x/text v0.18.0
+)
diff --git a/pkg/stringencoding/standard_string_encoder.go b/pkg/stringencoding/standard_string_encoder.go
new file mode 100644
index 0000000..ee459a6
--- /dev/null
+++ b/pkg/stringencoding/standard_string_encoder.go
@@ -0,0 +1,102 @@
+package stringencoding
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strings"
+
+	"github.com/axgle/mahonia"
+	"golang.org/x/text/encoding"
+	"golang.org/x/text/encoding/charmap"
+	"golang.org/x/text/encoding/unicode"
+	"golang.org/x/text/encoding/unicode/utf32"
+	"golang.org/x/text/transform"
+)
+
+func DecodeString(encodingName string, input []byte) (string, error) {
+	if encodingName == "" {
+		return "", fmt.Errorf("empty encoding string")
+	}
+
+	if input == nil || len(input) == 0 {
+		return "", fmt.Errorf("empty or null input")
+	}
+
+	var decoder *encoding.Decoder
+
+	// Определяем декодер в зависимости от кодировки
+	switch strings.ToLower(encodingName) {
+	case "utf-8":
+		decoder = unicode.UTF8.NewDecoder()
+	case "utf-16":
+		decoder = unicode.UTF16(unicode.LittleEndian, unicode.UseBOM).NewDecoder()
+	case "utf-16be":
+		decoder = unicode.UTF16(unicode.BigEndian, unicode.UseBOM).NewDecoder()
+	case "utf-32":
+		decoder = utf32.UTF32(utf32.LittleEndian, utf32.UseBOM).NewDecoder()
+	case "utf-32be":
+		decoder = utf32.UTF32(utf32.BigEndian, utf32.UseBOM).NewDecoder()
+	case "windows-1252":
+		decoder = charmap.Windows1252.NewDecoder()
+	case "iso-8859-1":
+		decoder = charmap.ISO8859_1.NewDecoder()
+	case "iso-8859-2":
+		decoder = charmap.ISO8859_2.NewDecoder()
+	case "iso-8859-3":
+		decoder = charmap.ISO8859_3.NewDecoder()
+	case "iso-8859-4":
+		decoder = charmap.ISO8859_4.NewDecoder()
+	case "iso-8859-5":
+		decoder = charmap.ISO8859_5.NewDecoder()
+	case "iso-8859-6":
+		decoder = charmap.ISO8859_6.NewDecoder()
+	case "iso-8859-7":
+		decoder = charmap.ISO8859_7.NewDecoder()
+	case "iso-8859-8":
+		decoder = charmap.ISO8859_8.NewDecoder()
+	case "iso-8859-9":
+		decoder = charmap.ISO8859_9.NewDecoder()
+	case "koi8-r":
+		decoder = charmap.KOI8R.NewDecoder()
+	case "gb2312":
+		return decodeGB2312(input)
+	case "gbk":
+		return decodeGBK(input)
+	case "shift_jis":
+		return decodeShiftJIS(input)
+	case "euc-jp":
+		return decodeEUCJP(input)
+	default:
+		return "", fmt.Errorf("unsupported encoding: %s", encodingName)
+	}
+
+	// Декодируем входные байты
+	decodingReader := transform.NewReader(strings.NewReader(string(input)), decoder)
+	decodedBytes, err := ioutil.ReadAll(decodingReader)
+	if err != nil {
+		return "", err
+	}
+
+	return string(decodedBytes), nil
+}
+
+// Функции для декодирования специфических кодировок с использованием mahonia
+func decodeGB2312(input []byte) (string, error) {
+	decoder := mahonia.NewDecoder("gb2312")
+	return decoder.ConvertString(string(input)), nil
+}
+
+func decodeGBK(input []byte) (string, error) {
+	decoder := mahonia.NewDecoder("gbk")
+	return decoder.ConvertString(string(input)), nil
+}
+
+func decodeShiftJIS(input []byte) (string, error) {
+	decoder := mahonia.NewDecoder("shift_jis")
+	return decoder.ConvertString(string(input)), nil
+}
+
+func decodeEUCJP(input []byte) (string, error) {
+	decoder := mahonia.NewDecoder("euc-jp")
+	return decoder.ConvertString(string(input)), nil
+}