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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";
"io/ioutil";
"os";
"reflect";
"strings";
"testing";
)
type testpair struct {
decoded, encoded string;
}
var pairs = []testpair{
// RFC 3548 examples
testpair{"\x14\xfb\x9c\x03\xd9\x7e", "FPucA9l+"},
testpair{"\x14\xfb\x9c\x03\xd9", "FPucA9k="},
testpair{"\x14\xfb\x9c\x03", "FPucAw=="},
// RFC 4648 examples
testpair{"", ""},
testpair{"f", "Zg=="},
testpair{"fo", "Zm8="},
testpair{"foo", "Zm9v"},
testpair{"foob", "Zm9vYg=="},
testpair{"fooba", "Zm9vYmE="},
testpair{"foobar", "Zm9vYmFy"},
// Wikipedia examples
testpair{"sure.", "c3VyZS4="},
testpair{"sure", "c3VyZQ=="},
testpair{"sur", "c3Vy"},
testpair{"su", "c3U="},
testpair{"leasure.", "bGVhc3VyZS4="},
testpair{"easure.", "ZWFzdXJlLg=="},
testpair{"asure.", "YXN1cmUu"},
testpair{"sure.", "c3VyZS4="},
}
var bigtest = testpair{
"Twas brillig, and the slithy toves",
"VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==",
}
func testEqual(t *testing.T, msg string, args ...) bool {
v := reflect.NewValue(args).(*reflect.StructValue);
v1 := v.Field(v.NumField() - 2);
v2 := v.Field(v.NumField() - 1);
if v1.Interface() != v2.Interface() {
t.Errorf(msg, args);
return false;
}
return true;
}
func TestEncode(t *testing.T) {
for _, p := range pairs {
buf := make([]byte, StdEncoding.EncodedLen(len(p.decoded)));
StdEncoding.Encode(buf, strings.Bytes(p.decoded));
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, string(buf), p.encoded);
}
}
func TestEncoder(t *testing.T) {
for _, p := range pairs {
bb := &bytes.Buffer{};
encoder := NewEncoder(StdEncoding, bb);
encoder.Write(strings.Bytes(p.decoded));
encoder.Close();
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded);
}
}
func TestEncoderBuffering(t *testing.T) {
input := strings.Bytes(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, os.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, os.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 {
dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)));
count, end, err := StdEncoding.decode(dbuf, strings.Bytes(p.encoded));
testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil));
testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded));
if len(p.encoded) > 0 {
testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
}
testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded);
}
}
func TestDecoder(t *testing.T) {
for _, p := range pairs {
decoder := NewDecoder(StdEncoding, bytes.NewBufferString(p.encoded));
dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)));
count, err := decoder.Read(dbuf);
if err != nil && err != os.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 != os.EOF {
count, err = decoder.Read(dbuf)
}
testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF);
}
}
func TestDecoderBuffering(t *testing.T) {
for bs := 1; bs <= 12; bs++ {
decoder := NewDecoder(StdEncoding, bytes.NewBufferString(bigtest.encoded));
buf := make([]byte, len(bigtest.decoded)+12);
var total int;
for total = 0; total < len(bigtest.decoded); {
n, err := decoder.Read(buf[total : total+bs]);
testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, os.Error(nil));
total += n;
}
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{
corrupt{"!!!!", 0},
corrupt{"x===", 1},
corrupt{"AA=A", 2},
corrupt{"AAA=AAAA", 3},
corrupt{"AAAAA", 4},
corrupt{"AAAAAA", 4},
};
for _, e := range examples {
dbuf := make([]byte, StdEncoding.DecodedLen(len(e.e)));
_, err := StdEncoding.Decode(dbuf, strings.Bytes(e.e));
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(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 := ioutil.ReadAll(NewDecoder(StdEncoding, encoded));
if err != nil {
t.Fatalf("ioutil.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);
}
}
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