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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 base64
import (
"bytes"
"errors"
"fmt"
"io"
"reflect"
"runtime/debug"
"strings"
"testing"
"time"
)
type testpair struct {
decoded, encoded string
}
var pairs = []testpair{
// RFC 3548 examples
{"\x14\xfb\x9c\x03\xd9\x7e", "FPucA9l+"},
{"\x14\xfb\x9c\x03\xd9", "FPucA9k="},
{"\x14\xfb\x9c\x03", "FPucAw=="},
// RFC 4648 examples
{"", ""},
{"f", "Zg=="},
{"fo", "Zm8="},
{"foo", "Zm9v"},
{"foob", "Zm9vYg=="},
{"fooba", "Zm9vYmE="},
{"foobar", "Zm9vYmFy"},
// Wikipedia examples
{"sure.", "c3VyZS4="},
{"sure", "c3VyZQ=="},
{"sur", "c3Vy"},
{"su", "c3U="},
{"leasure.", "bGVhc3VyZS4="},
{"easure.", "ZWFzdXJlLg=="},
{"asure.", "YXN1cmUu"},
{"sure.", "c3VyZS4="},
}
// Do nothing to a reference base64 string (leave in standard format)
func stdRef(ref string) string {
return ref
}
// Convert a reference string to URL-encoding
func urlRef(ref string) string {
ref = strings.ReplaceAll(ref, "+", "-")
ref = strings.ReplaceAll(ref, "/", "_")
return ref
}
// Convert a reference string to raw, unpadded format
func rawRef(ref string) string {
return strings.TrimRight(ref, "=")
}
// Both URL and unpadding conversions
func rawURLRef(ref string) string {
return rawRef(urlRef(ref))
}
// A nonstandard encoding with a funny padding character, for testing
var funnyEncoding = NewEncoding(encodeStd).WithPadding(rune('@'))
func funnyRef(ref string) string {
return strings.ReplaceAll(ref, "=", "@")
}
type encodingTest struct {
enc *Encoding // Encoding to test
conv func(string) string // Reference string converter
}
var encodingTests = []encodingTest{
{StdEncoding, stdRef},
{URLEncoding, urlRef},
{RawStdEncoding, rawRef},
{RawURLEncoding, rawURLRef},
{funnyEncoding, funnyRef},
{StdEncoding.Strict(), stdRef},
{URLEncoding.Strict(), urlRef},
{RawStdEncoding.Strict(), rawRef},
{RawURLEncoding.Strict(), rawURLRef},
{funnyEncoding.Strict(), funnyRef},
}
var bigtest = testpair{
"Twas brillig, and the slithy toves",
"VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==",
}
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 {
for _, tt := range encodingTests {
got := tt.enc.EncodeToString([]byte(p.decoded))
testEqual(t, "Encode(%q) = %q, want %q", p.decoded,
got, tt.conv(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 {
for _, tt := range encodingTests {
encoded := tt.conv(p.encoded)
dbuf := make([]byte, tt.enc.DecodedLen(len(encoded)))
count, err := tt.enc.Decode(dbuf, []byte(encoded))
testEqual(t, "Decode(%q) = error %v, want %v", encoded, err, error(nil))
testEqual(t, "Decode(%q) = length %v, want %v", encoded, count, len(p.decoded))
testEqual(t, "Decode(%q) = %q, want %q", encoded, string(dbuf[0:count]), p.decoded)
dbuf, err = tt.enc.DecodeString(encoded)
testEqual(t, "DecodeString(%q) = error %v, want %v", encoded, err, error(nil))
testEqual(t, "DecodeString(%q) = %q, want %q", 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)
}
}
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},
{"\n", -1},
{"AAA=\n", -1},
{"AAAA\n", -1},
{"!!!!", 0},
{"====", 0},
{"x===", 1},
{"=AAA", 0},
{"A=AA", 1},
{"AA=A", 2},
{"AA==A", 4},
{"AAA=AAAA", 4},
{"AAAAA", 4},
{"AAAAAA", 4},
{"A=", 1},
{"A==", 1},
{"AA=", 3},
{"AA==", -1},
{"AAA=", -1},
{"AAAA", -1},
{"AAAAAA=", 7},
{"YWJjZA=====", 8},
{"A!\n", 1},
{"A=\n", 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 TestDecodeBounds(t *testing.T) {
var buf [32]byte
s := StdEncoding.EncodeToString(buf[:])
defer func() {
if err := recover(); err != nil {
t.Fatalf("Decode panicked unexpectedly: %v\n%s", err, debug.Stack())
}
}()
n, err := StdEncoding.Decode(buf[:], []byte(s))
if n != len(buf) || err != nil {
t.Fatalf("StdEncoding.Decode = %d, %v, want %d, nil", n, err, len(buf))
}
}
func TestEncodedLen(t *testing.T) {
for _, tt := range []struct {
enc *Encoding
n int
want int
}{
{RawStdEncoding, 0, 0},
{RawStdEncoding, 1, 2},
{RawStdEncoding, 2, 3},
{RawStdEncoding, 3, 4},
{RawStdEncoding, 7, 10},
{StdEncoding, 0, 0},
{StdEncoding, 1, 4},
{StdEncoding, 2, 4},
{StdEncoding, 3, 4},
{StdEncoding, 4, 8},
{StdEncoding, 7, 12},
} {
if got := tt.enc.EncodedLen(tt.n); got != tt.want {
t.Errorf("EncodedLen(%d): got %d, want %d", tt.n, got, tt.want)
}
}
}
func TestDecodedLen(t *testing.T) {
for _, tt := range []struct {
enc *Encoding
n int
want int
}{
{RawStdEncoding, 0, 0},
{RawStdEncoding, 2, 1},
{RawStdEncoding, 3, 2},
{RawStdEncoding, 4, 3},
{RawStdEncoding, 10, 7},
{StdEncoding, 0, 0},
{StdEncoding, 4, 3},
{StdEncoding, 8, 6},
} {
if got := tt.enc.DecodedLen(tt.n); 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)
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 TestNewLineCharacters(t *testing.T) {
// Each of these should decode to the string "sure", without errors.
const expected = "sure"
examples := []string{
"c3VyZQ==",
"c3VyZQ==\r",
"c3VyZQ==\n",
"c3VyZQ==\r\n",
"c3VyZ\r\nQ==",
"c3V\ryZ\nQ==",
"c3V\nyZ\rQ==",
"c3VyZ\nQ==",
"c3VyZQ\n==",
"c3VyZQ=\n=",
"c3VyZQ=\r\n\r\n=",
}
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)
}
}
}
type nextRead struct {
n int // bytes to return
err error // error to return
}
// faultInjectReader returns data from source, rate-limited
// and with the errors as written to nextc.
type faultInjectReader struct {
source string
nextc <-chan nextRead
}
func (r *faultInjectReader) Read(p []byte) (int, error) {
nr := <-r.nextc
if len(p) > nr.n {
p = p[:nr.n]
}
n := copy(p, r.source)
r.source = r.source[n:]
return n, nr.err
}
// tests that we don't ignore errors from our underlying reader
func TestDecoderIssue3577(t *testing.T) {
next := make(chan nextRead, 10)
wantErr := errors.New("my error")
next <- nextRead{5, nil}
next <- nextRead{10, wantErr}
next <- nextRead{0, wantErr}
d := NewDecoder(StdEncoding, &faultInjectReader{
source: "VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==", // twas brillig...
nextc: next,
})
errc := make(chan error, 1)
go func() {
_, err := io.ReadAll(d)
errc <- err
}()
select {
case err := <-errc:
if err != wantErr {
t.Errorf("got error %v; want %v", err, wantErr)
}
case <-time.After(5 * time.Second):
t.Errorf("timeout; Decoder blocked without returning an error")
}
}
func TestDecoderIssue4779(t *testing.T) {
encoded := `CP/EAT8AAAEF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`
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 TestDecoderIssue7733(t *testing.T) {
s, err := StdEncoding.DecodeString("YWJjZA=====")
want := CorruptInputError(8)
if !reflect.DeepEqual(want, err) {
t.Errorf("Error = %v; want CorruptInputError(8)", err)
}
if string(s) != "abcd" {
t.Errorf("DecodeString = %q; want abcd", s)
}
}
func TestDecoderIssue15656(t *testing.T) {
_, err := StdEncoding.Strict().DecodeString("WvLTlMrX9NpYDQlEIFlnDB==")
want := CorruptInputError(22)
if !reflect.DeepEqual(want, err) {
t.Errorf("Error = %v; want CorruptInputError(22)", err)
}
_, err = StdEncoding.Strict().DecodeString("WvLTlMrX9NpYDQlEIFlnDA==")
if err != nil {
t.Errorf("Error = %v; want nil", err)
}
_, err = StdEncoding.DecodeString("WvLTlMrX9NpYDQlEIFlnDB==")
if err != nil {
t.Errorf("Error = %v; want nil", err)
}
}
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 BenchmarkDecodeString(b *testing.B) {
sizes := []int{2, 4, 8, 64, 8192}
benchFunc := func(b *testing.B, benchSize int) {
data := StdEncoding.EncodeToString(make([]byte, benchSize))
b.SetBytes(int64(len(data)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
StdEncoding.DecodeString(data)
}
}
for _, size := range sizes {
b.Run(fmt.Sprintf("%d", size), func(b *testing.B) {
benchFunc(b, size)
})
}
}
func TestDecoderRaw(t *testing.T) {
source := "AAAAAA"
want := []byte{0, 0, 0, 0}
// Direct.
dec1, err := RawURLEncoding.DecodeString(source)
if err != nil || !bytes.Equal(dec1, want) {
t.Errorf("RawURLEncoding.DecodeString(%q) = %x, %v, want %x, nil", source, dec1, err, want)
}
// Through reader. Used to fail.
r := NewDecoder(RawURLEncoding, bytes.NewReader([]byte(source)))
dec2, err := io.ReadAll(io.LimitReader(r, 100))
if err != nil || !bytes.Equal(dec2, want) {
t.Errorf("reading NewDecoder(RawURLEncoding, %q) = %x, %v, want %x, nil", source, dec2, err, want)
}
// Should work with padding.
r = NewDecoder(URLEncoding, bytes.NewReader([]byte(source+"==")))
dec3, err := io.ReadAll(r)
if err != nil || !bytes.Equal(dec3, want) {
t.Errorf("reading NewDecoder(URLEncoding, %q) = %x, %v, want %x, nil", source+"==", dec3, err, want)
}
}