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

	return &decoder{enc: enc, r: &newlineFilteringReader{r}}
}

// DecodedLen returns the maximum length in bytes of the decoded data
// corresponding to n bytes of base32-encoded data.
func (enc *Encoding) DecodedLen(n int) int {
	return decodedLen(n, enc.padChar)
}

func decodedLen(n int, padChar rune) int {
	if padChar == NoPadding {
		return n/8*5 + n%8*5/8
	}
	return n / 8 * 5

		tests = append(tests, test{rawStdEncoding, math.MaxInt, 5764607523034234879})
	}
	for _, tt := range tests {
		if got := tt.enc.DecodedLen(tt.n); int64(got) != tt.want {
			t.Errorf("DecodedLen(%d): got %d, want %d", tt.n, got, tt.want)
		}
	}
}

func TestWithoutPaddingClose(t *testing.T) {
	encodings := []*Encoding{
		StdEncoding,

	// 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

	}
	if length <= 0 {
		length = secretKeyMaxLen
	}
	if length < secretKeyMinLen {
		return "", errors.New("auth: secret key length is too short")
	}

	key := make([]byte, base64.RawStdEncoding.DecodedLen(length))
	if _, err := io.ReadFull(random, key); err != nil {
		return "", err
	}

	s := base64.RawStdEncoding.EncodeToString(key)
	return strings.ReplaceAll(s, "/", "+"), nil
}

AAAAAAAAAAEAAAAFAAAAAAAAAAAAAAAAAEAAAAAAAAAAQAAAAAAAfQAAAAAAAAB9AAAAAAAAAAAA
IAAAAAAAsDyZDwU=`

	mysteryBinaryBytes := make([]byte, base64.StdEncoding.DecodedLen(len(encodedMysteryBinary)))
	numBytes, err := base64.StdEncoding.Decode(mysteryBinaryBytes, []byte(encodedMysteryBinary))
	if err != nil {
		t.Fatalf("Unexpected error decoding binary payload: %v", err)
	}

			if v.Type().Elem().Kind() != reflect.Uint8 {
				d.saveError(&UnmarshalTypeError{Value: "string", Type: v.Type(), Offset: int64(d.readIndex())})
				break
			}
			b := make([]byte, base64.StdEncoding.DecodedLen(len(s)))
			n, err := base64.StdEncoding.Decode(b, s)
			if err != nil {
				d.saveError(err)
				break
			}
			v.SetBytes(b[:n])
		case reflect.String:
			t := string(s)

		return
	}

	if !strings.HasPrefix(val, "0x") {
		Exitf("-B argument must start with 0x: %s", val)
	}

	ov := val
	val = val[2:]

	const maxLen = 32
	if hex.DecodedLen(len(val)) > maxLen {
		Exitf("-B option too long (max %d digits): %s", maxLen, ov)
	}

	b, err := hex.DecodeString(val)
	if err != nil {
		if err == hex.ErrLength {

	r1, _, e1 := syscall.Syscall9(procCryptDecodeObject.Addr(), 7, uintptr(encodingType), uintptr(unsafe.Pointer(structType)), uintptr(unsafe.Pointer(encodedBytes)), uintptr(lenEncodedBytes), uintptr(flags), uintptr(decoded), uintptr(unsafe.Pointer(decodedLen)), 0, 0)
	if r1 == 0 {
		err = errnoErr(e1)
	}
	return
}