1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
// 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 ascii85
import (
"bytes"
"io"
"strings"
"testing"
)
type testpair struct {
decoded, encoded string
}
var bigtest = testpair{
"Man is distinguished, not only by his reason, but by this singular passion from " +
"other animals, which is a lust of the mind, that by a perseverance of delight in " +
"the continued and indefatigable generation of knowledge, exceeds the short " +
"vehemence of any carnal pleasure.",
"9jqo^BlbD-BleB1DJ+*+F(f,q/0JhKF<GL>Cj@.4Gp$d7F!,L7@<6@)/0JDEF<G%<+EV:2F!,\n" +
"O<DJ+*.@<*K0@<6L(Df-\\0Ec5e;DffZ(EZee.Bl.9pF\"AGXBPCsi+DGm>@3BB/F*&OCAfu2/AKY\n" +
"i(DIb:@FD,*)+C]U=@3BN#EcYf8ATD3s@q?d$AftVqCh[NqF<G:8+EV:.+Cf>-FD5W8ARlolDIa\n" +
"l(DId<j@<?3r@:F%a+D58'ATD4$Bl@l3De:,-DJs`8ARoFb/0JMK@qB4^F!,R<AKZ&-DfTqBG%G\n" +
">uD.RTpAKYo'+CT/5+Cei#DII?(E,9)oF*2M7/c\n",
}
var pairs = []testpair{
// Encode returns 0 when len(src) is 0
{
"",
"",
},
// Wikipedia example
bigtest,
// Special case when shortening !!!!! to z.
{
"\000\000\000\000",
"z",
},
}
func testEqual(t *testing.T, msg string, args ...interface{}) bool {
t.Helper()
if args[len(args)-2] != args[len(args)-1] {
t.Errorf(msg, args...)
return false
}
return true
}
func strip85(s string) string {
t := make([]byte, len(s))
w := 0
for r := 0; r < len(s); r++ {
c := s[r]
if c > ' ' {
t[w] = c
w++
}
}
return string(t[0:w])
}
func TestEncode(t *testing.T) {
for _, p := range pairs {
buf := make([]byte, MaxEncodedLen(len(p.decoded)))
n := Encode(buf, []byte(p.decoded))
buf = buf[0:n]
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, strip85(string(buf)), strip85(p.encoded))
}
}
func TestEncoder(t *testing.T) {
for _, p := range pairs {
bb := &bytes.Buffer{}
encoder := NewEncoder(bb)
encoder.Write([]byte(p.decoded))
encoder.Close()
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, strip85(bb.String()), strip85(p.encoded))
}
}
func TestEncoderBuffering(t *testing.T) {
input := []byte(bigtest.decoded)
for bs := 1; bs <= 12; bs++ {
bb := &bytes.Buffer{}
encoder := NewEncoder(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, strip85(bb.String()), strip85(bigtest.encoded))
}
}
func TestDecode(t *testing.T) {
for _, p := range pairs {
dbuf := make([]byte, 4*len(p.encoded))
ndst, nsrc, err := Decode(dbuf, []byte(p.encoded), true)
testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
testEqual(t, "Decode(%q) = nsrc %v, want %v", p.encoded, nsrc, len(p.encoded))
testEqual(t, "Decode(%q) = ndst %v, want %v", p.encoded, ndst, len(p.decoded))
testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:ndst]), p.decoded)
}
}
func TestDecoder(t *testing.T) {
for _, p := range pairs {
decoder := NewDecoder(strings.NewReader(p.encoded))
dbuf, err := io.ReadAll(decoder)
if err != nil {
t.Fatal("Read failed", err)
}
testEqual(t, "Read from %q = length %v, want %v", p.encoded, len(dbuf), len(p.decoded))
testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf), p.decoded)
if err != nil {
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(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) {
type corrupt struct {
e string
p int
}
examples := []corrupt{
{"v", 0},
{"!z!!!!!!!!!", 1},
}
for _, e := range examples {
dbuf := make([]byte, 4*len(e.e))
_, _, err := Decode(dbuf, []byte(e.e), true)
switch err := err.(type) {
case CorruptInputError:
testEqual(t, "Corruption in %q at offset %v, want %v", e.e, int(err), e.p)
default:
t.Error("Decoder failed to detect corruption in", e)
}
}
}
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(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(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 TestDecoderInternalWhitespace(t *testing.T) {
s := strings.Repeat(" ", 2048) + "z"
decoded, err := io.ReadAll(NewDecoder(strings.NewReader(s)))
if err != nil {
t.Errorf("Decode gave error %v", err)
}
if want := []byte("\000\000\000\000"); !bytes.Equal(want, decoded) {
t.Errorf("Decode failed: got %v, want %v", decoded, want)
}
}
|
