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package encoding
import (
"bytes"
"io"
"testing"
)
// badReader/Writer used to test error handling
type badReader struct{}
func (br *badReader) Read([]byte) (int, error) { return 0, io.EOF }
type badWriter struct{}
func (bw *badWriter) Write([]byte) (int, error) { return 0, nil }
func TestReadPrefix(t *testing.T) {
b := new(bytes.Buffer)
// standard
b.Write(append(EncUint64(3), "foo"...))
data, err := ReadPrefix(b, 3)
if err != nil {
t.Error(err)
} else if string(data) != "foo" {
t.Errorf("expected foo, got %s", data)
}
// 0-length
b.Write(EncUint64(0))
_, err = ReadPrefix(b, 0)
if err != nil {
t.Error(err)
}
// empty
b.Write([]byte{})
_, err = ReadPrefix(b, 3)
if err != io.EOF {
t.Error("expected EOF, got", err)
}
// less than 8 bytes
b.Write([]byte{1, 2, 3})
_, err = ReadPrefix(b, 3)
if err != io.ErrUnexpectedEOF {
t.Error("expected unexpected EOF, got", err)
}
// exceed maxLen
b.Write(EncUint64(4))
_, err = ReadPrefix(b, 3)
if err == nil || err.Error() != "length 4 exceeds maxLen of 3" {
t.Error("expected maxLen error, got", err)
}
// no data after length prefix
b.Write(EncUint64(3))
_, err = ReadPrefix(b, 3)
if err != io.EOF {
t.Error("expected EOF, got", err)
}
}
func TestReadObject(t *testing.T) {
b := new(bytes.Buffer)
var obj string
// standard
b.Write(EncUint64(11))
b.Write(append(EncUint64(3), "foo"...))
err := ReadObject(b, &obj, 11)
if err != nil {
t.Error(err)
} else if obj != "foo" {
t.Errorf("expected foo, got %s", obj)
}
// empty
b.Write([]byte{})
err = ReadObject(b, &obj, 0)
if err != io.EOF {
t.Error("expected EOF, got", err)
}
// bad object
b.Write(EncUint64(3))
b.WriteString("foo") // strings need an additional length prefix
err = ReadObject(b, &obj, 3)
if err == nil || err.Error() != "could not decode type string: "+io.ErrUnexpectedEOF.Error() {
t.Error("expected unexpected EOF, got", err)
}
}
func TestWritePrefix(t *testing.T) {
b := new(bytes.Buffer)
// standard
err := WritePrefix(b, []byte("foo"))
expected := append(EncUint64(3), "foo"...)
if err != nil {
t.Error(err)
} else if !bytes.Equal(b.Bytes(), expected) {
t.Errorf("WritePrefix wrote wrong data: expected %v, got %v", b.Bytes(), expected)
}
// badWriter (returns nil error, but doesn't write anything)
bw := new(badWriter)
err = WritePrefix(bw, []byte("foo"))
if err != io.ErrShortWrite {
t.Error("expected ErrShortWrite, got", err)
}
}
func TestWriteObject(t *testing.T) {
b := new(bytes.Buffer)
// standard
err := WriteObject(b, "foo")
expected := append(EncUint64(11), append(EncUint64(3), "foo"...)...)
if err != nil {
t.Error(err)
} else if !bytes.Equal(b.Bytes(), expected) {
t.Errorf("WritePrefix wrote wrong data: expected %v, got %v", b.Bytes(), expected)
}
// badWriter
bw := new(badWriter)
err = WriteObject(bw, "foo")
if err != io.ErrShortWrite {
t.Error("expected ErrShortWrite, got", err)
}
}
func TestReadWritePrefix(t *testing.T) {
b := new(bytes.Buffer)
// WritePrefix -> ReadPrefix
data := []byte("foo")
err := WritePrefix(b, data)
if err != nil {
t.Fatal(err)
}
rdata, err := ReadPrefix(b, 100)
if err != nil {
t.Error(err)
} else if !bytes.Equal(rdata, data) {
t.Errorf("read/write mismatch: wrote %s, read %s", data, rdata)
}
// WriteObject -> ReadObject
obj := "bar"
err = WriteObject(b, obj)
if err != nil {
t.Fatal(err)
}
var robj string
err = ReadObject(b, &robj, 100)
if err != nil {
t.Error(err)
} else if robj != obj {
t.Errorf("read/write mismatch: wrote %s, read %s", obj, robj)
}
}
|
