Adding upstream version 1.20.14.upstream/1.20.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 820 insertions, 0 deletions

diff --git a/src/encoding/base32/base32_test.go b/src/encoding/base32/base32_test.go
new file mode 100644
index 0000000..8118531
--- /dev/null
+++ b/src/encoding/base32/base32_test.go
@@ -0,0 +1,820 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package base32
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"strings"
+	"testing"
+)
+
+type testpair struct {
+	decoded, encoded string
+}
+
+var pairs = []testpair{
+	// RFC 4648 examples
+	{"", ""},
+	{"f", "MY======"},
+	{"fo", "MZXQ===="},
+	{"foo", "MZXW6==="},
+	{"foob", "MZXW6YQ="},
+	{"fooba", "MZXW6YTB"},
+	{"foobar", "MZXW6YTBOI======"},
+
+	// Wikipedia examples, converted to base32
+	{"sure.", "ON2XEZJO"},
+	{"sure", "ON2XEZI="},
+	{"sur", "ON2XE==="},
+	{"su", "ON2Q===="},
+	{"leasure.", "NRSWC43VOJSS4==="},
+	{"easure.", "MVQXG5LSMUXA===="},
+	{"asure.", "MFZXK4TFFY======"},
+	{"sure.", "ON2XEZJO"},
+}
+
+var bigtest = testpair{
+	"Twas brillig, and the slithy toves",
+	"KR3WC4ZAMJZGS3DMNFTSYIDBNZSCA5DIMUQHG3DJORUHSIDUN53GK4Y=",
+}
+
+func testEqual(t *testing.T, msg string, args ...any) bool {
+	t.Helper()
+	if args[len(args)-2] != args[len(args)-1] {
+		t.Errorf(msg, args...)
+		return false
+	}
+	return true
+}
+
+func TestEncode(t *testing.T) {
+	for _, p := range pairs {
+		got := StdEncoding.EncodeToString([]byte(p.decoded))
+		testEqual(t, "Encode(%q) = %q, want %q", p.decoded, got, p.encoded)
+	}
+}
+
+func TestEncoder(t *testing.T) {
+	for _, p := range pairs {
+		bb := &strings.Builder{}
+		encoder := NewEncoder(StdEncoding, bb)
+		encoder.Write([]byte(p.decoded))
+		encoder.Close()
+		testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded)
+	}
+}
+
+func TestEncoderBuffering(t *testing.T) {
+	input := []byte(bigtest.decoded)
+	for bs := 1; bs <= 12; bs++ {
+		bb := &strings.Builder{}
+		encoder := NewEncoder(StdEncoding, bb)
+		for pos := 0; pos < len(input); pos += bs {
+			end := pos + bs
+			if end > len(input) {
+				end = len(input)
+			}
+			n, err := encoder.Write(input[pos:end])
+			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
+			testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
+		}
+		err := encoder.Close()
+		testEqual(t, "Close gave error %v, want %v", err, error(nil))
+		testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, bb.String(), bigtest.encoded)
+	}
+}
+
+func TestDecode(t *testing.T) {
+	for _, p := range pairs {
+		dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
+		count, end, err := StdEncoding.decode(dbuf, []byte(p.encoded))
+		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
+		testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded))
+		if len(p.encoded) > 0 {
+			testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
+		}
+		testEqual(t, "Decode(%q) = %q, want %q", p.encoded,
+			string(dbuf[0:count]),
+			p.decoded)
+
+		dbuf, err = StdEncoding.DecodeString(p.encoded)
+		testEqual(t, "DecodeString(%q) = error %v, want %v", p.encoded, err, error(nil))
+		testEqual(t, "DecodeString(%q) = %q, want %q", p.encoded, string(dbuf), p.decoded)
+	}
+}
+
+func TestDecoder(t *testing.T) {
+	for _, p := range pairs {
+		decoder := NewDecoder(StdEncoding, strings.NewReader(p.encoded))
+		dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
+		count, err := decoder.Read(dbuf)
+		if err != nil && err != io.EOF {
+			t.Fatal("Read failed", err)
+		}
+		testEqual(t, "Read from %q = length %v, want %v", p.encoded, count, len(p.decoded))
+		testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
+		if err != io.EOF {
+			_, err = decoder.Read(dbuf)
+		}
+		testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
+	}
+}
+
+type badReader struct {
+	data   []byte
+	errs   []error
+	called int
+	limit  int
+}
+
+// Populates p with data, returns a count of the bytes written and an
+// error.  The error returned is taken from badReader.errs, with each
+// invocation of Read returning the next error in this slice, or io.EOF,
+// if all errors from the slice have already been returned.  The
+// number of bytes returned is determined by the size of the input buffer
+// the test passes to decoder.Read and will be a multiple of 8, unless
+// badReader.limit is non zero.
+func (b *badReader) Read(p []byte) (int, error) {
+	lim := len(p)
+	if b.limit != 0 && b.limit < lim {
+		lim = b.limit
+	}
+	if len(b.data) < lim {
+		lim = len(b.data)
+	}
+	for i := range p[:lim] {
+		p[i] = b.data[i]
+	}
+	b.data = b.data[lim:]
+	err := io.EOF
+	if b.called < len(b.errs) {
+		err = b.errs[b.called]
+	}
+	b.called++
+	return lim, err
+}
+
+// TestIssue20044 tests that decoder.Read behaves correctly when the caller
+// supplied reader returns an error.
+func TestIssue20044(t *testing.T) {
+	badErr := errors.New("bad reader error")
+	testCases := []struct {
+		r       badReader
+		res     string
+		err     error
+		dbuflen int
+	}{
+		// Check valid input data accompanied by an error is processed and the error is propagated.
+		{r: badReader{data: []byte("MY======"), errs: []error{badErr}},
+			res: "f", err: badErr},
+		// Check a read error accompanied by input data consisting of newlines only is propagated.
+		{r: badReader{data: []byte("\n\n\n\n\n\n\n\n"), errs: []error{badErr, nil}},
+			res: "", err: badErr},
+		// Reader will be called twice.  The first time it will return 8 newline characters.  The
+		// second time valid base32 encoded data and an error.  The data should be decoded
+		// correctly and the error should be propagated.
+		{r: badReader{data: []byte("\n\n\n\n\n\n\n\nMY======"), errs: []error{nil, badErr}},
+			res: "f", err: badErr, dbuflen: 8},
+		// Reader returns invalid input data (too short) and an error.  Verify the reader
+		// error is returned.
+		{r: badReader{data: []byte("MY====="), errs: []error{badErr}},
+			res: "", err: badErr},
+		// Reader returns invalid input data (too short) but no error.  Verify io.ErrUnexpectedEOF
+		// is returned.
+		{r: badReader{data: []byte("MY====="), errs: []error{nil}},
+			res: "", err: io.ErrUnexpectedEOF},
+		// Reader returns invalid input data and an error.  Verify the reader and not the
+		// decoder error is returned.
+		{r: badReader{data: []byte("Ma======"), errs: []error{badErr}},
+			res: "", err: badErr},
+		// Reader returns valid data and io.EOF.  Check data is decoded and io.EOF is propagated.
+		{r: badReader{data: []byte("MZXW6YTB"), errs: []error{io.EOF}},
+			res: "fooba", err: io.EOF},
+		// Check errors are properly reported when decoder.Read is called multiple times.
+		// decoder.Read will be called 8 times, badReader.Read will be called twice, returning
+		// valid data both times but an error on the second call.
+		{r: badReader{data: []byte("NRSWC43VOJSS4==="), errs: []error{nil, badErr}},
+			res: "leasure.", err: badErr, dbuflen: 1},
+		// Check io.EOF is properly reported when decoder.Read is called multiple times.
+		// decoder.Read will be called 8 times, badReader.Read will be called twice, returning
+		// valid data both times but io.EOF on the second call.
+		{r: badReader{data: []byte("NRSWC43VOJSS4==="), errs: []error{nil, io.EOF}},
+			res: "leasure.", err: io.EOF, dbuflen: 1},
+		// The following two test cases check that errors are propagated correctly when more than
+		// 8 bytes are read at a time.
+		{r: badReader{data: []byte("NRSWC43VOJSS4==="), errs: []error{io.EOF}},
+			res: "leasure.", err: io.EOF, dbuflen: 11},
+		{r: badReader{data: []byte("NRSWC43VOJSS4==="), errs: []error{badErr}},
+			res: "leasure.", err: badErr, dbuflen: 11},
+		// Check that errors are correctly propagated when the reader returns valid bytes in
+		// groups that are not divisible by 8.  The first read will return 11 bytes and no
+		// error.  The second will return 7 and an error.  The data should be decoded correctly
+		// and the error should be propagated.
+		{r: badReader{data: []byte("NRSWC43VOJSS4==="), errs: []error{nil, badErr}, limit: 11},
+			res: "leasure.", err: badErr},
+	}
+
+	for _, tc := range testCases {
+		input := tc.r.data
+		decoder := NewDecoder(StdEncoding, &tc.r)
+		var dbuflen int
+		if tc.dbuflen > 0 {
+			dbuflen = tc.dbuflen
+		} else {
+			dbuflen = StdEncoding.DecodedLen(len(input))
+		}
+		dbuf := make([]byte, dbuflen)
+		var err error
+		var res []byte
+		for err == nil {
+			var n int
+			n, err = decoder.Read(dbuf)
+			if n > 0 {
+				res = append(res, dbuf[:n]...)
+			}
+		}
+
+		testEqual(t, "Decoding of %q = %q, want %q", string(input), string(res), tc.res)
+		testEqual(t, "Decoding of %q err = %v, expected %v", string(input), err, tc.err)
+	}
+}
+
+// TestDecoderError verifies decode errors are propagated when there are no read
+// errors.
+func TestDecoderError(t *testing.T) {
+	for _, readErr := range []error{io.EOF, nil} {
+		input := "MZXW6YTb"
+		dbuf := make([]byte, StdEncoding.DecodedLen(len(input)))
+		br := badReader{data: []byte(input), errs: []error{readErr}}
+		decoder := NewDecoder(StdEncoding, &br)
+		n, err := decoder.Read(dbuf)
+		testEqual(t, "Read after EOF, n = %d, expected %d", n, 0)
+		if _, ok := err.(CorruptInputError); !ok {
+			t.Errorf("Corrupt input error expected.  Found %T", err)
+		}
+	}
+}
+
+// TestReaderEOF ensures decoder.Read behaves correctly when input data is
+// exhausted.
+func TestReaderEOF(t *testing.T) {
+	for _, readErr := range []error{io.EOF, nil} {
+		input := "MZXW6YTB"
+		br := badReader{data: []byte(input), errs: []error{nil, readErr}}
+		decoder := NewDecoder(StdEncoding, &br)
+		dbuf := make([]byte, StdEncoding.DecodedLen(len(input)))
+		n, err := decoder.Read(dbuf)
+		testEqual(t, "Decoding of %q err = %v, expected %v", input, err, error(nil))
+		n, err = decoder.Read(dbuf)
+		testEqual(t, "Read after EOF, n = %d, expected %d", n, 0)
+		testEqual(t, "Read after EOF, err = %v, expected %v", err, io.EOF)
+		n, err = decoder.Read(dbuf)
+		testEqual(t, "Read after EOF, n = %d, expected %d", n, 0)
+		testEqual(t, "Read after EOF, err = %v, expected %v", err, io.EOF)
+	}
+}
+
+func TestDecoderBuffering(t *testing.T) {
+	for bs := 1; bs <= 12; bs++ {
+		decoder := NewDecoder(StdEncoding, strings.NewReader(bigtest.encoded))
+		buf := make([]byte, len(bigtest.decoded)+12)
+		var total int
+		var n int
+		var err error
+		for total = 0; total < len(bigtest.decoded) && err == nil; {
+			n, err = decoder.Read(buf[total : total+bs])
+			total += n
+		}
+		if err != nil && err != io.EOF {
+			t.Errorf("Read from %q at pos %d = %d, unexpected error %v", bigtest.encoded, total, n, err)
+		}
+		testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
+	}
+}
+
+func TestDecodeCorrupt(t *testing.T) {
+	testCases := []struct {
+		input  string
+		offset int // -1 means no corruption.
+	}{
+		{"", -1},
+		{"!!!!", 0},
+		{"x===", 0},
+		{"AA=A====", 2},
+		{"AAA=AAAA", 3},
+		{"MMMMMMMMM", 8},
+		{"MMMMMM", 0},
+		{"A=", 1},
+		{"AA=", 3},
+		{"AA==", 4},
+		{"AA===", 5},
+		{"AAAA=", 5},
+		{"AAAA==", 6},
+		{"AAAAA=", 6},
+		{"AAAAA==", 7},
+		{"A=======", 1},
+		{"AA======", -1},
+		{"AAA=====", 3},
+		{"AAAA====", -1},
+		{"AAAAA===", -1},
+		{"AAAAAA==", 6},
+		{"AAAAAAA=", -1},
+		{"AAAAAAAA", -1},
+	}
+	for _, tc := range testCases {
+		dbuf := make([]byte, StdEncoding.DecodedLen(len(tc.input)))
+		_, err := StdEncoding.Decode(dbuf, []byte(tc.input))
+		if tc.offset == -1 {
+			if err != nil {
+				t.Error("Decoder wrongly detected corruption in", tc.input)
+			}
+			continue
+		}
+		switch err := err.(type) {
+		case CorruptInputError:
+			testEqual(t, "Corruption in %q at offset %v, want %v", tc.input, int(err), tc.offset)
+		default:
+			t.Error("Decoder failed to detect corruption in", tc)
+		}
+	}
+}
+
+func TestBig(t *testing.T) {
+	n := 3*1000 + 1
+	raw := make([]byte, n)
+	const alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	for i := 0; i < n; i++ {
+		raw[i] = alpha[i%len(alpha)]
+	}
+	encoded := new(bytes.Buffer)
+	w := NewEncoder(StdEncoding, encoded)
+	nn, err := w.Write(raw)
+	if nn != n || err != nil {
+		t.Fatalf("Encoder.Write(raw) = %d, %v want %d, nil", nn, err, n)
+	}
+	err = w.Close()
+	if err != nil {
+		t.Fatalf("Encoder.Close() = %v want nil", err)
+	}
+	decoded, err := io.ReadAll(NewDecoder(StdEncoding, encoded))
+	if err != nil {
+		t.Fatalf("io.ReadAll(NewDecoder(...)): %v", err)
+	}
+
+	if !bytes.Equal(raw, decoded) {
+		var i int
+		for i = 0; i < len(decoded) && i < len(raw); i++ {
+			if decoded[i] != raw[i] {
+				break
+			}
+		}
+		t.Errorf("Decode(Encode(%d-byte string)) failed at offset %d", n, i)
+	}
+}
+
+func testStringEncoding(t *testing.T, expected string, examples []string) {
+	for _, e := range examples {
+		buf, err := StdEncoding.DecodeString(e)
+		if err != nil {
+			t.Errorf("Decode(%q) failed: %v", e, err)
+			continue
+		}
+		if s := string(buf); s != expected {
+			t.Errorf("Decode(%q) = %q, want %q", e, s, expected)
+		}
+	}
+}
+
+func TestNewLineCharacters(t *testing.T) {
+	// Each of these should decode to the string "sure", without errors.
+	examples := []string{
+		"ON2XEZI=",
+		"ON2XEZI=\r",
+		"ON2XEZI=\n",
+		"ON2XEZI=\r\n",
+		"ON2XEZ\r\nI=",
+		"ON2X\rEZ\nI=",
+		"ON2X\nEZ\rI=",
+		"ON2XEZ\nI=",
+		"ON2XEZI\n=",
+	}
+	testStringEncoding(t, "sure", examples)
+
+	// Each of these should decode to the string "foobar", without errors.
+	examples = []string{
+		"MZXW6YTBOI======",
+		"MZXW6YTBOI=\r\n=====",
+	}
+	testStringEncoding(t, "foobar", examples)
+}
+
+func TestDecoderIssue4779(t *testing.T) {
+	encoded := `JRXXEZLNEBUXA43VNUQGI33MN5ZCA43JOQQGC3LFOQWCAY3PNZZWKY3UMV2HK4
+RAMFSGS4DJONUWG2LOM4QGK3DJOQWCA43FMQQGI3YKMVUXK43NN5SCA5DFNVYG64RANFXGG2LENFSH
+K3TUEB2XIIDMMFRG64TFEBSXIIDEN5WG64TFEBWWCZ3OMEQGC3DJOF2WCLRAKV2CAZLONFWQUYLEEB
+WWS3TJNUQHMZLONFQW2LBAOF2WS4ZANZXXG5DSOVSCAZLYMVZGG2LUMF2GS33OEB2WY3DBNVRW6IDM
+MFRG64TJOMQG42LTNEQHK5AKMFWGS4LVNFYCAZLYEBSWCIDDN5WW233EN4QGG33OONSXC5LBOQXCAR
+DVNFZSAYLVORSSA2LSOVZGKIDEN5WG64RANFXAU4TFOBZGK2DFNZSGK4TJOQQGS3RAOZXWY5LQORQX
+IZJAOZSWY2LUEBSXG43FEBRWS3DMOVWSAZDPNRXXEZJAMV2SAZTVM5UWC5BANZ2WY3DBBJYGC4TJMF
+2HK4ROEBCXQY3FOB2GK5LSEBZWS3TUEBXWGY3BMVRWC5BAMN2XA2LEMF2GC5BANZXW4IDQOJXWSZDF
+NZ2CYIDTOVXHIIDJNYFGG5LMOBQSA4LVNEQG6ZTGNFRWSYJAMRSXGZLSOVXHIIDNN5WGY2LUEBQW42
+LNEBUWIIDFON2CA3DBMJXXE5LNFY==
+====`
+	encodedShort := strings.ReplaceAll(encoded, "\n", "")
+
+	dec := NewDecoder(StdEncoding, strings.NewReader(encoded))
+	res1, err := io.ReadAll(dec)
+	if err != nil {
+		t.Errorf("ReadAll failed: %v", err)
+	}
+
+	dec = NewDecoder(StdEncoding, strings.NewReader(encodedShort))
+	var res2 []byte
+	res2, err = io.ReadAll(dec)
+	if err != nil {
+		t.Errorf("ReadAll failed: %v", err)
+	}
+
+	if !bytes.Equal(res1, res2) {
+		t.Error("Decoded results not equal")
+	}
+}
+
+func BenchmarkEncode(b *testing.B) {
+	data := make([]byte, 8192)
+	buf := make([]byte, StdEncoding.EncodedLen(len(data)))
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		StdEncoding.Encode(buf, data)
+	}
+}
+
+func BenchmarkEncodeToString(b *testing.B) {
+	data := make([]byte, 8192)
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		StdEncoding.EncodeToString(data)
+	}
+}
+
+func BenchmarkDecode(b *testing.B) {
+	data := make([]byte, StdEncoding.EncodedLen(8192))
+	StdEncoding.Encode(data, make([]byte, 8192))
+	buf := make([]byte, 8192)
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		StdEncoding.Decode(buf, data)
+	}
+}
+func BenchmarkDecodeString(b *testing.B) {
+	data := StdEncoding.EncodeToString(make([]byte, 8192))
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		StdEncoding.DecodeString(data)
+	}
+}
+
+func TestWithCustomPadding(t *testing.T) {
+	for _, testcase := range pairs {
+		defaultPadding := StdEncoding.EncodeToString([]byte(testcase.decoded))
+		customPadding := StdEncoding.WithPadding('@').EncodeToString([]byte(testcase.decoded))
+		expected := strings.ReplaceAll(defaultPadding, "=", "@")
+
+		if expected != customPadding {
+			t.Errorf("Expected custom %s, got %s", expected, customPadding)
+		}
+		if testcase.encoded != defaultPadding {
+			t.Errorf("Expected %s, got %s", testcase.encoded, defaultPadding)
+		}
+	}
+}
+
+func TestWithoutPadding(t *testing.T) {
+	for _, testcase := range pairs {
+		defaultPadding := StdEncoding.EncodeToString([]byte(testcase.decoded))
+		customPadding := StdEncoding.WithPadding(NoPadding).EncodeToString([]byte(testcase.decoded))
+		expected := strings.TrimRight(defaultPadding, "=")
+
+		if expected != customPadding {
+			t.Errorf("Expected custom %s, got %s", expected, customPadding)
+		}
+		if testcase.encoded != defaultPadding {
+			t.Errorf("Expected %s, got %s", testcase.encoded, defaultPadding)
+		}
+	}
+}
+
+func TestDecodeWithPadding(t *testing.T) {
+	encodings := []*Encoding{
+		StdEncoding,
+		StdEncoding.WithPadding('-'),
+		StdEncoding.WithPadding(NoPadding),
+	}
+
+	for i, enc := range encodings {
+		for _, pair := range pairs {
+
+			input := pair.decoded
+			encoded := enc.EncodeToString([]byte(input))
+
+			decoded, err := enc.DecodeString(encoded)
+			if err != nil {
+				t.Errorf("DecodeString Error for encoding %d (%q): %v", i, input, err)
+			}
+
+			if input != string(decoded) {
+				t.Errorf("Unexpected result for encoding %d: got %q; want %q", i, decoded, input)
+			}
+		}
+	}
+}
+
+func TestDecodeWithWrongPadding(t *testing.T) {
+	encoded := StdEncoding.EncodeToString([]byte("foobar"))
+
+	_, err := StdEncoding.WithPadding('-').DecodeString(encoded)
+	if err == nil {
+		t.Error("expected error")
+	}
+
+	_, err = StdEncoding.WithPadding(NoPadding).DecodeString(encoded)
+	if err == nil {
+		t.Error("expected error")
+	}
+}
+
+func TestBufferedDecodingSameError(t *testing.T) {
+	testcases := []struct {
+		prefix            string
+		chunkCombinations [][]string
+		expected          error
+	}{
+		// NBSWY3DPO5XXE3DE == helloworld
+		// Test with "ZZ" as extra input
+		{"helloworld", [][]string{
+			{"NBSW", "Y3DP", "O5XX", "E3DE", "ZZ"},
+			{"NBSWY3DPO5XXE3DE", "ZZ"},
+			{"NBSWY3DPO5XXE3DEZZ"},
+			{"NBS", "WY3", "DPO", "5XX", "E3D", "EZZ"},
+			{"NBSWY3DPO5XXE3", "DEZZ"},
+		}, io.ErrUnexpectedEOF},
+
+		// Test with "ZZY" as extra input
+		{"helloworld", [][]string{
+			{"NBSW", "Y3DP", "O5XX", "E3DE", "ZZY"},
+			{"NBSWY3DPO5XXE3DE", "ZZY"},
+			{"NBSWY3DPO5XXE3DEZZY"},
+			{"NBS", "WY3", "DPO", "5XX", "E3D", "EZZY"},
+			{"NBSWY3DPO5XXE3", "DEZZY"},
+		}, io.ErrUnexpectedEOF},
+
+		// Normal case, this is valid input
+		{"helloworld", [][]string{
+			{"NBSW", "Y3DP", "O5XX", "E3DE"},
+			{"NBSWY3DPO5XXE3DE"},
+			{"NBS", "WY3", "DPO", "5XX", "E3D", "E"},
+			{"NBSWY3DPO5XXE3", "DE"},
+		}, nil},
+
+		// MZXW6YTB = fooba
+		{"fooba", [][]string{
+			{"MZXW6YTBZZ"},
+			{"MZXW6YTBZ", "Z"},
+			{"MZXW6YTB", "ZZ"},
+			{"MZXW6YT", "BZZ"},
+			{"MZXW6Y", "TBZZ"},
+			{"MZXW6Y", "TB", "ZZ"},
+			{"MZXW6", "YTBZZ"},
+			{"MZXW6", "YTB", "ZZ"},
+			{"MZXW6", "YT", "BZZ"},
+		}, io.ErrUnexpectedEOF},
+
+		// Normal case, this is valid input
+		{"fooba", [][]string{
+			{"MZXW6YTB"},
+			{"MZXW6YT", "B"},
+			{"MZXW6Y", "TB"},
+			{"MZXW6", "YTB"},
+			{"MZXW6", "YT", "B"},
+			{"MZXW", "6YTB"},
+			{"MZXW", "6Y", "TB"},
+		}, nil},
+	}
+
+	for _, testcase := range testcases {
+		for _, chunks := range testcase.chunkCombinations {
+			pr, pw := io.Pipe()
+
+			// Write the encoded chunks into the pipe
+			go func() {
+				for _, chunk := range chunks {
+					pw.Write([]byte(chunk))
+				}
+				pw.Close()
+			}()
+
+			decoder := NewDecoder(StdEncoding, pr)
+			_, err := io.ReadAll(decoder)
+
+			if err != testcase.expected {
+				t.Errorf("Expected %v, got %v; case %s %+v", testcase.expected, err, testcase.prefix, chunks)
+			}
+		}
+	}
+}
+
+func TestBufferedDecodingPadding(t *testing.T) {
+	testcases := []struct {
+		chunks        []string
+		expectedError string
+	}{
+		{[]string{
+			"I4======",
+			"==",
+		}, "unexpected EOF"},
+
+		{[]string{
+			"I4======N4======",
+		}, "illegal base32 data at input byte 2"},
+
+		{[]string{
+			"I4======",
+			"N4======",
+		}, "illegal base32 data at input byte 0"},
+
+		{[]string{
+			"I4======",
+			"========",
+		}, "illegal base32 data at input byte 0"},
+
+		{[]string{
+			"I4I4I4I4",
+			"I4======",
+			"I4======",
+		}, "illegal base32 data at input byte 0"},
+	}
+
+	for _, testcase := range testcases {
+		testcase := testcase
+		pr, pw := io.Pipe()
+		go func() {
+			for _, chunk := range testcase.chunks {
+				_, _ = pw.Write([]byte(chunk))
+			}
+			_ = pw.Close()
+		}()
+
+		decoder := NewDecoder(StdEncoding, pr)
+		_, err := io.ReadAll(decoder)
+
+		if err == nil && len(testcase.expectedError) != 0 {
+			t.Errorf("case %q: got nil error, want %v", testcase.chunks, testcase.expectedError)
+		} else if err.Error() != testcase.expectedError {
+			t.Errorf("case %q: got %v, want %v", testcase.chunks, err, testcase.expectedError)
+		}
+	}
+}
+
+func TestEncodedDecodedLen(t *testing.T) {
+	type test struct {
+		in      int
+		wantEnc int
+		wantDec int
+	}
+	data := bytes.Repeat([]byte("x"), 100)
+	for _, test := range []struct {
+		name  string
+		enc   *Encoding
+		cases []test
+	}{
+		{"StdEncoding", StdEncoding, []test{
+			{0, 0, 0},
+			{1, 8, 5},
+			{5, 8, 5},
+			{6, 16, 10},
+			{10, 16, 10},
+		}},
+		{"NoPadding", StdEncoding.WithPadding(NoPadding), []test{
+			{0, 0, 0},
+			{1, 2, 1},
+			{2, 4, 2},
+			{5, 8, 5},
+			{6, 10, 6},
+			{7, 12, 7},
+			{10, 16, 10},
+			{11, 18, 11},
+		}},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			for _, tc := range test.cases {
+				encLen := test.enc.EncodedLen(tc.in)
+				decLen := test.enc.DecodedLen(encLen)
+				enc := test.enc.EncodeToString(data[:tc.in])
+				if len(enc) != encLen {
+					t.Fatalf("EncodedLen(%d) = %d but encoded to %q (%d)", tc.in, encLen, enc, len(enc))
+				}
+				if encLen != tc.wantEnc {
+					t.Fatalf("EncodedLen(%d) = %d; want %d", tc.in, encLen, tc.wantEnc)
+				}
+				if decLen != tc.wantDec {
+					t.Fatalf("DecodedLen(%d) = %d; want %d", encLen, decLen, tc.wantDec)
+				}
+			}
+		})
+	}
+}
+
+func TestWithoutPaddingClose(t *testing.T) {
+	encodings := []*Encoding{
+		StdEncoding,
+		StdEncoding.WithPadding(NoPadding),
+	}
+
+	for _, encoding := range encodings {
+		for _, testpair := range pairs {
+
+			var buf strings.Builder
+			encoder := NewEncoder(encoding, &buf)
+			encoder.Write([]byte(testpair.decoded))
+			encoder.Close()
+
+			expected := testpair.encoded
+			if encoding.padChar == NoPadding {
+				expected = strings.ReplaceAll(expected, "=", "")
+			}
+
+			res := buf.String()
+
+			if res != expected {
+				t.Errorf("Expected %s got %s; padChar=%d", expected, res, encoding.padChar)
+			}
+		}
+	}
+}
+
+func TestDecodeReadAll(t *testing.T) {
+	encodings := []*Encoding{
+		StdEncoding,
+		StdEncoding.WithPadding(NoPadding),
+	}
+
+	for _, pair := range pairs {
+		for encIndex, encoding := range encodings {
+			encoded := pair.encoded
+			if encoding.padChar == NoPadding {
+				encoded = strings.ReplaceAll(encoded, "=", "")
+			}
+
+			decReader, err := io.ReadAll(NewDecoder(encoding, strings.NewReader(encoded)))
+			if err != nil {
+				t.Errorf("NewDecoder error: %v", err)
+			}
+
+			if pair.decoded != string(decReader) {
+				t.Errorf("Expected %s got %s; Encoding %d", pair.decoded, decReader, encIndex)
+			}
+		}
+	}
+}
+
+func TestDecodeSmallBuffer(t *testing.T) {
+	encodings := []*Encoding{
+		StdEncoding,
+		StdEncoding.WithPadding(NoPadding),
+	}
+
+	for bufferSize := 1; bufferSize < 200; bufferSize++ {
+		for _, pair := range pairs {
+			for encIndex, encoding := range encodings {
+				encoded := pair.encoded
+				if encoding.padChar == NoPadding {
+					encoded = strings.ReplaceAll(encoded, "=", "")
+				}
+
+				decoder := NewDecoder(encoding, strings.NewReader(encoded))
+
+				var allRead []byte
+
+				for {
+					buf := make([]byte, bufferSize)
+					n, err := decoder.Read(buf)
+					allRead = append(allRead, buf[0:n]...)
+					if err == io.EOF {
+						break
+					}
+					if err != nil {
+						t.Error(err)
+					}
+				}
+
+				if pair.decoded != string(allRead) {
+					t.Errorf("Expected %s got %s; Encoding %d; bufferSize %d", pair.decoded, allRead, encIndex, bufferSize)
+				}
+			}
+		}
+	}
+}