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// Copyright 2021 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package efi
import (
"fmt"
"strings"
"unicode"
"unicode/utf16"
"unicode/utf8"
)
// ConvertUTF16ToUTF8 converts the supplied UTF-16 or UCS2 string
// to a UTF-8 string. If the supplied string is NULL-terminated,
// then the NULL termination is removed from the string.
func ConvertUTF16ToUTF8(in []uint16) string {
var u8 []byte
for _, r := range utf16.Decode(in) {
if r == 0 {
break
}
u8Char := make([]byte, utf8.RuneLen(r))
utf8.EncodeRune(u8Char, r)
u8 = append(u8, u8Char...)
}
return string(u8)
}
// ConvertUTF8ToUTF16 converts the supplied UTF-8 string to a
// UTF-16 string.
func ConvertUTF8ToUTF16(in string) []uint16 {
var unicodeStr []rune
for len(in) > 0 {
r, sz := utf8.DecodeRuneInString(in)
unicodeStr = append(unicodeStr, r)
in = in[sz:]
}
return utf16.Encode(unicodeStr)
}
// ConvertUTF8ToUCS2 converts the supplied UTF-8 string to a
// UCS2 string. Any code point outside of the Basic Multilingual
// Plane cannot be represented by UCS2 and is converted to the
// replacement character.
func ConvertUTF8ToUCS2(in string) []uint16 {
var unicodeStr []rune
for len(in) > 0 {
r, sz := utf8.DecodeRuneInString(in)
if r >= 0x10000 {
r = unicode.ReplacementChar
}
unicodeStr = append(unicodeStr, r)
in = in[sz:]
}
return utf16.Encode(unicodeStr)
}
type indentStringer struct {
src fmt.Stringer
indent int
}
func (s *indentStringer) String() string {
indent := make([]byte, s.indent)
for i := range indent {
indent[i] = '\t'
}
return strings.Replace(s.src.String(), "\n", "\n"+string(indent), -1)
}
func indent(src fmt.Stringer, indent int) fmt.Stringer {
return &indentStringer{src: src, indent: indent}
}
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