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jeremybenn |
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ascii85
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import (
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"bytes"
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"io"
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"io/ioutil"
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"testing"
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)
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type testpair struct {
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decoded, encoded string
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}
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var pairs = []testpair{
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// Wikipedia example
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{
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"Man is distinguished, not only by his reason, but by this singular passion from " +
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"other animals, which is a lust of the mind, that by a perseverance of delight in " +
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"the continued and indefatigable generation of knowledge, exceeds the short " +
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"vehemence of any carnal pleasure.",
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"9jqo^BlbD-BleB1DJ+*+F(f,q/0JhKFCj@.4Gp$d7F!,L7@<6@)/0JDEF
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"O@3BB/F*&OCAfu2/AKY\n" +
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"i(DIb:@FD,*)+C]U=@3BN#EcYf8ATD3s@q?d$AftVqCh[NqF-FD5W8ARlolDIa\n" +
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"l(DId
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">uD.RTpAKYo'+CT/5+Cei#DII?(E,9)oF*2M7/c\n",
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},
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}
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var bigtest = pairs[len(pairs)-1]
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func testEqual(t *testing.T, msg string, args ...interface{}) bool {
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if args[len(args)-2] != args[len(args)-1] {
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t.Errorf(msg, args...)
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return false
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}
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return true
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}
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func strip85(s string) string {
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t := make([]byte, len(s))
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w := 0
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for r := 0; r < len(s); r++ {
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c := s[r]
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if c > ' ' {
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t[w] = c
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w++
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}
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}
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return string(t[0:w])
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}
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func TestEncode(t *testing.T) {
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for _, p := range pairs {
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buf := make([]byte, MaxEncodedLen(len(p.decoded)))
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n := Encode(buf, []byte(p.decoded))
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buf = buf[0:n]
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testEqual(t, "Encode(%q) = %q, want %q", p.decoded, strip85(string(buf)), strip85(p.encoded))
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}
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}
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func TestEncoder(t *testing.T) {
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for _, p := range pairs {
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bb := &bytes.Buffer{}
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encoder := NewEncoder(bb)
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encoder.Write([]byte(p.decoded))
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encoder.Close()
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testEqual(t, "Encode(%q) = %q, want %q", p.decoded, strip85(bb.String()), strip85(p.encoded))
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}
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}
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func TestEncoderBuffering(t *testing.T) {
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input := []byte(bigtest.decoded)
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for bs := 1; bs <= 12; bs++ {
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bb := &bytes.Buffer{}
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encoder := NewEncoder(bb)
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for pos := 0; pos < len(input); pos += bs {
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end := pos + bs
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if end > len(input) {
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end = len(input)
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}
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n, err := encoder.Write(input[pos:end])
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testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
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testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
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}
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err := encoder.Close()
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testEqual(t, "Close gave error %v, want %v", err, error(nil))
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testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, strip85(bb.String()), strip85(bigtest.encoded))
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}
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}
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func TestDecode(t *testing.T) {
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for _, p := range pairs {
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dbuf := make([]byte, 4*len(p.encoded))
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ndst, nsrc, err := Decode(dbuf, []byte(p.encoded), true)
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testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
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testEqual(t, "Decode(%q) = nsrc %v, want %v", p.encoded, nsrc, len(p.encoded))
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testEqual(t, "Decode(%q) = ndst %v, want %v", p.encoded, ndst, len(p.decoded))
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testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:ndst]), p.decoded)
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}
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}
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func TestDecoder(t *testing.T) {
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for _, p := range pairs {
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decoder := NewDecoder(bytes.NewBufferString(p.encoded))
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dbuf, err := ioutil.ReadAll(decoder)
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if err != nil {
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t.Fatal("Read failed", err)
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}
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testEqual(t, "Read from %q = length %v, want %v", p.encoded, len(dbuf), len(p.decoded))
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testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf), p.decoded)
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if err != nil {
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testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
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}
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}
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}
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func TestDecoderBuffering(t *testing.T) {
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for bs := 1; bs <= 12; bs++ {
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decoder := NewDecoder(bytes.NewBufferString(bigtest.encoded))
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buf := make([]byte, len(bigtest.decoded)+12)
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var total int
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for total = 0; total < len(bigtest.decoded); {
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n, err := decoder.Read(buf[total : total+bs])
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testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
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total += n
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}
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testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
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}
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}
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func TestDecodeCorrupt(t *testing.T) {
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type corrupt struct {
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e string
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p int
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}
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examples := []corrupt{
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{"v", 0},
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{"!z!!!!!!!!!", 1},
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}
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for _, e := range examples {
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dbuf := make([]byte, 4*len(e.e))
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_, _, err := Decode(dbuf, []byte(e.e), true)
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switch err := err.(type) {
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case CorruptInputError:
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testEqual(t, "Corruption in %q at offset %v, want %v", e.e, int(err), e.p)
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default:
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t.Error("Decoder failed to detect corruption in", e)
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}
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}
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}
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func TestBig(t *testing.T) {
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n := 3*1000 + 1
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raw := make([]byte, n)
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const alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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for i := 0; i < n; i++ {
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raw[i] = alpha[i%len(alpha)]
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}
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encoded := new(bytes.Buffer)
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w := NewEncoder(encoded)
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nn, err := w.Write(raw)
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if nn != n || err != nil {
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t.Fatalf("Encoder.Write(raw) = %d, %v want %d, nil", nn, err, n)
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}
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err = w.Close()
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if err != nil {
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t.Fatalf("Encoder.Close() = %v want nil", err)
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}
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decoded, err := ioutil.ReadAll(NewDecoder(encoded))
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if err != nil {
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t.Fatalf("io.ReadAll(NewDecoder(...)): %v", err)
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}
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if !bytes.Equal(raw, decoded) {
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var i int
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for i = 0; i < len(decoded) && i < len(raw); i++ {
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if decoded[i] != raw[i] {
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break
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}
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}
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t.Errorf("Decode(Encode(%d-byte string)) failed at offset %d", n, i)
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}
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}
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