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-rw-r--r--src/encoding/ascii85/ascii85_test.go214
1 files changed, 214 insertions, 0 deletions
diff --git a/src/encoding/ascii85/ascii85_test.go b/src/encoding/ascii85/ascii85_test.go
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+++ b/src/encoding/ascii85/ascii85_test.go
@@ -0,0 +1,214 @@
+// 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 ...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)
+ }
+}