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Copy pathucs2.go
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ucs2.go
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package charset
import (
"errors"
"unicode/utf16"
)
// ErrUnevenNumber happens when the number of octets (bytes) in the input is uneven.
var ErrUnevenNumber = errors.New("decode ucs2: uneven number of octets")
// EncodeUcs2 encodes the given UTF-8 text into UCS2 (UTF-16) encoding and returns the produced octets.
func EncodeUcs2(str string) []byte {
buf := utf16.Encode([]rune(str))
octets := make([]byte, 0, len(buf)*2)
for _, n := range buf {
octets = append(octets, byte(n&0xFF00>>8), byte(n&0x00FF))
}
return octets
}
// DecodeUcs2 decodes the given UCS2 (UTF-16) octet data into a UTF-8 encoded string.
func DecodeUcs2(octets []byte) (str string, err error) {
if len(octets)%2 != 0 {
err = ErrUnevenNumber
return
}
buf := make([]uint16, 0, len(octets)/2)
for i := 0; i < len(octets); i += 2 {
buf = append(buf, uint16(octets[i])<<8|uint16(octets[i+1]))
}
runes := utf16.Decode(buf)
return string(runes), nil
}