mod_UCS2.go

package main

import (
	"log"

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

// UCS2 text codec.
type UCS2 []byte

// Type implements the Codec interface.
func (s UCS2) Type() DataCoding {
	return UCS2Type
}

// DataCoding to define text codecs.
type DataCoding uint8

// Supported text codecs.
const (
	DefaultType DataCoding = 0x00 // SMSC Default Alphabet
	//	IA5Type       DataCoding = 0x01 // IA5 (CCITT T.50)/ASCII (ANSI X3.4)
	//	BinaryType    DataCoding = 0x02 // Octet unspecified (8-bit binary)
	Latin1Type DataCoding = 0x03 // Latin 1 (ISO-8859-1)
	//	Binary2Type   DataCoding = 0x04 // Octet unspecified (8-bit binary)
	//	JISType       DataCoding = 0x05 // JIS (X 0208-1990)
	ISO88595Type DataCoding = 0x06 // Cyrillic (ISO-8859-5)
	//	ISO88598Type  DataCoding = 0x07 // Latin/Hebrew (ISO-8859-8)
	UCS2Type DataCoding = 0x08 // UCS2 (ISO/IEC-10646)
	//	PictogramType DataCoding = 0x09 // Pictogram Encoding
	//	ISO2022JPType DataCoding = 0x0A // ISO-2022-JP (Music Codes)
	//	EXTJISType    DataCoding = 0x0D // Extended Kanji JIS (X 0212-1990)
	//	KSC5601Type   DataCoding = 0x0E // KS C 5601
)

// Codec defines a text codec.
type Codec interface {
	// Type returns the value for the data_coding PDU.
	Type() DataCoding

	// Encode text.
	Encode() []byte

	// Decode text.
	Decode() []byte
}

// Encode to UCS2.
func (s UCS2) Encode() []byte {
	e := unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM)
	es, _, err := transform.Bytes(e.NewEncoder(), s)
	if err != nil {
		return s
	}
	return es
}

// Decode from UCS2.
func (s UCS2) Decode() []byte {
	e := unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM)
	es, _, err := transform.Bytes(e.NewDecoder(), s)
	if err != nil {
		return s
	}
	return es
}

// UCS2Decode - decode string from UCS2
func UCS2Decode(text string) string {
	s := UCS2([]byte(text))
	if s.Type() != 0x08 {
		log.Printf("Unexpected data type; want 0x08, have %d \n", s.Type())
	}
	return string(s.Decode())
}