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package util
import (
"bytes"
"errors"
"io"
"golang.org/x/text/encoding/unicode"
"golang.org/x/text/transform"
)
// Read a null terminated string
func ReadNullString(f io.Reader) []byte {
var ret []byte
for {
block := make([]byte, 2)
r, _ := f.Read(block)
if r == 0 {
break
}
ret = append(ret, block...)
if bytes.Equal(block, []byte{0x00, 0x00}) {
break
}
}
return ret
}
func MarshalUtf16Var(s string) []byte {
var b bytes.Buffer
utf16 := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM)
utf16Writer := transform.NewWriter(&b, utf16.NewEncoder())
utf16Writer.Write([]byte(s))
utf16Writer.Write([]byte("\x00"))
return b.Bytes()
}
// Parse an efivar as a UTF-16 string.
func ParseUtf16Var(data *bytes.Buffer) (string, error) {
utf16 := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM)
utf16Reader := transform.NewReader(data, utf16.NewDecoder())
b, err := io.ReadAll(utf16Reader)
if err != nil {
return "", err
}
if b[len(b)-1] != 0 {
return "", errors.New("value is not a null-terminated string")
}
return string(bytes.Trim(b, "\x00")), nil
}
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