func (e InvalidByteError) Error() string {
	return fmt.Sprintf("encoding/hex: invalid byte: %#U", rune(e))
}

// DecodedLen returns the length of a decoding of x source bytes.
// Specifically, it returns x / 2.
func DecodedLen(x int) int { return x / 2 }

// Decode decodes src into [DecodedLen](len(src)) bytes,
// returning the actual number of bytes written to dst.
//
// Decode expects that src contains only hexadecimal

	// Encode always uses lowercase.
	decTests := append(encDecTests, encDecTest{"F8F9FAFBFCFDFEFF", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}})
	for i, test := range decTests {
		dst := make([]byte, DecodedLen(len(test.enc)))
		n, err := Decode(dst, []byte(test.enc))
		if err != nil {
			t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst))
		} else if !bytes.Equal(dst, test.dec) {

		// The line must end with only whitespace.
		if s, _ := getLine(restOfEndLine); len(s) != 0 {
			continue
		}

		base64Data := removeSpacesAndTabs(rest[:endIndex])
		p.Bytes = make([]byte, base64.StdEncoding.DecodedLen(len(base64Data)))
		n, err := base64.StdEncoding.Decode(p.Bytes, base64Data)
		if err != nil {
			continue
		}
		p.Bytes = p.Bytes[:n]

		// the -1 is because we might have only matched pemEnd without the