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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"
"io/ioutil"
"testing"
)
type testpair struct {
decoded, encoded string
}
var pairs = []testpair{
// RFC 3548 examples
{"\x14\xfb\x9c\x03\xd9\x7e", "FPucA9l+"},
{"\x14\xfb\x9c\x03\xd9", "FPucA9k="},
{"\x14\xfb\x9c\x03", "FPucAw=="},
// RFC 4648 examples
{"", ""},
{"f", "Zg=="},
{"fo", "Zm8="},
{"foo", "Zm9v"},
{"foob", "Zm9vYg=="},
{"fooba", "Zm9vYmE="},
{"foobar", "Zm9vYmFy"},
// Wikipedia examples
{"sure.", "c3VyZS4="},
{"sure", "c3VyZQ=="},
{"sur", "c3Vy"},
{"su", "c3U="},
{"leasure.", "bGVhc3VyZS4="},
{"easure.", "ZWFzdXJlLg=="},
{"asure.", "YXN1cmUu"},
{"sure.", "c3VyZS4="},
}
var bigtest = testpair{
"Twas brillig, and the slithy toves",
"VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==",
}
func testEqual(t *testing.T, msg string, args ...interface{}) bool {
if args[len(args)-2] != args[len(args)-1] {
t.Errorf(msg, args...)
return false
}
return true
}
func TestEncode(t *testing.T) {
for _, p := range pairs {
got := StdEncoding.EncodeToString([]byte(p.decoded))
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, got, p.encoded)
}
}
func TestEncoder(t *testing.T) {
for _, p := range pairs {
bb := &bytes.Buffer{}
encoder := NewEncoder(StdEncoding, bb)
encoder.Write([]byte(p.decoded))
encoder.Close()
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded)
}
}
func TestEncoderBuffering(t *testing.T) {
input := []byte(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, 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, 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, []byte(p.encoded))
testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, 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)
dbuf, err = StdEncoding.DecodeString(p.encoded)
testEqual(t, "DecodeString(%q) = error %v, want %v", p.encoded, err, error(nil))
testEqual(t, "DecodeString(%q) = %q, want %q", string(dbuf), 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 != io.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 != io.EOF {
count, err = decoder.Read(dbuf)
}
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(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, 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{
{"!!!!", 0},
{"x===", 1},
{"AA=A", 2},
{"AAA=AAAA", 3},
{"AAAAA", 4},
{"AAAAAA", 4},
}
for _, e := range examples {
dbuf := make([]byte, StdEncoding.DecodedLen(len(e.e)))
_, err := StdEncoding.Decode(dbuf, []byte(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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