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

		return
	}
	fmt.Printf("%q\n", data)
	// Output:
	// "some data with \x00 and \ufeff"
}

func ExampleEncoding_Decode() {
	str := "JBSWY3DPFQQHO33SNRSCC==="
	dst := make([]byte, base32.StdEncoding.DecodedLen(len(str)))
	n, err := base32.StdEncoding.Decode(dst, []byte(str))
	if err != nil {
		fmt.Println("decode error:", err)
		return
	}
	dst = dst[:n]
	fmt.Printf("%q\n", dst)
	// Output:
	// "Hello, world!"

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

// DecodedLen returns the maximum length in bytes of the decoded data
// corresponding to n bytes of base64-encoded data.
func (enc *Encoding) DecodedLen(n int) int {
	return decodedLen(n, enc.padChar)
}

func decodedLen(n int, padChar rune) int {
	if padChar == NoPadding {

		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,

	// Try PEM
	if block, _ := pem.Decode(priv); block != nil {
		return x509.ParsePKCS1PrivateKey(block.Bytes)
	}
	// Try base 64
	dst := make([]byte, base64.StdEncoding.DecodedLen(len(priv)))
	if n, err := base64.StdEncoding.Decode(dst, priv); err == nil {
		return x509.ParsePKCS1PrivateKey(dst[:n])
	}
	// Try Raw, return error
	return x509.ParsePKCS1PrivateKey(priv)
}

		tests = append(tests, test{RawStdEncoding, math.MaxInt, 6917529027641081855})
	}
	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 TestBig(t *testing.T) {
	n := 3*1000 + 1
	raw := make([]byte, n)

		return
	}
	fmt.Printf("%q\n", data)
	// Output:
	// "some data with \x00 and \ufeff"
}

func ExampleEncoding_Decode() {
	str := "SGVsbG8sIHdvcmxkIQ=="
	dst := make([]byte, base64.StdEncoding.DecodedLen(len(str)))
	n, err := base64.StdEncoding.Decode(dst, []byte(str))
	if err != nil {
		fmt.Println("decode error:", err)
		return
	}
	dst = dst[:n]
	fmt.Printf("%q\n", dst)
	// Output:
	// "Hello, world!"

	hex.Encode(dst, src)

	fmt.Printf("%s\n", dst)

	// Output:
	// 48656c6c6f20476f7068657221
}

func ExampleDecode() {
	src := []byte("48656c6c6f20476f7068657221")

	dst := make([]byte, hex.DecodedLen(len(src)))
	n, err := hex.Decode(dst, src)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s\n", dst[:n])

	// Output:
	// Hello Gopher!
}

func ExampleDecodeString() {

func (s *Set) allowSHA256(hash string) error {
	// validate that the hash is the right length to be a full SHA-256 hash
	hashLength := hex.DecodedLen(len(hash))
	if hashLength != sha256.Size {
		return errors.Errorf("expected a %d byte SHA-256 hash, found %d bytes", sha256.Size, hashLength)
	}

	// validate that the hash is valid hex