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// 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"
"io"
"io/ioutil"
"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 ...interface{}) bool {
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 := &bytes.Buffer{}
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 := &bytes.Buffer{}
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 {
count, err = decoder.Read(dbuf)
}
testEqual(t, "Read from %q = %v, want %v", p.encoded, 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
for total = 0; total < len(bigtest.decoded); {
n, err := decoder.Read(buf[total : total+bs])
testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
total += n
}
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 coruption 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 := ioutil.ReadAll(NewDecoder(StdEncoding, encoded))
if err != nil {
t.Fatalf("ioutil.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.Replace(encoded, "\n", "", -1)
dec := NewDecoder(StdEncoding, strings.NewReader(encoded))
res1, err := ioutil.ReadAll(dec)
if err != nil {
t.Errorf("ReadAll failed: %v", err)
}
dec = NewDecoder(StdEncoding, strings.NewReader(encodedShort))
var res2 []byte
res2, err = ioutil.ReadAll(dec)
if err != nil {
t.Errorf("ReadAll failed: %v", err)
}
if !bytes.Equal(res1, res2) {
t.Error("Decoded results not equal")
}
}
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