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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 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 ...any) 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 := &strings.Builder{}
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 := &strings.Builder{}
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)
}
}