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|
package struc
import (
"bytes"
"encoding/binary"
"io"
"strconv"
"testing"
)
type Int3 uint32
func (i *Int3) Pack(p []byte, opt *Options) (int, error) {
var tmp [4]byte
binary.BigEndian.PutUint32(tmp[:], uint32(*i))
copy(p, tmp[1:])
return 3, nil
}
func (i *Int3) Unpack(r io.Reader, length int, opt *Options) error {
var tmp [4]byte
if _, err := r.Read(tmp[1:]); err != nil {
return err
}
*i = Int3(binary.BigEndian.Uint32(tmp[:]))
return nil
}
func (i *Int3) Size(opt *Options) int {
return 3
}
func (i *Int3) String() string {
return strconv.FormatUint(uint64(*i), 10)
}
func TestCustom(t *testing.T) {
var buf bytes.Buffer
var i Int3 = 3
if err := Pack(&buf, &i); err != nil {
t.Fatal(err)
}
if !bytes.Equal(buf.Bytes(), []byte{0, 0, 3}) {
t.Fatal("error packing custom int")
}
var i2 Int3
if err := Unpack(&buf, &i2); err != nil {
t.Fatal(err)
}
if i2 != 3 {
t.Fatal("error unpacking custom int")
}
}
type Int3Struct struct {
I Int3
}
func TestCustomStruct(t *testing.T) {
var buf bytes.Buffer
i := Int3Struct{3}
if err := Pack(&buf, &i); err != nil {
t.Fatal(err)
}
if !bytes.Equal(buf.Bytes(), []byte{0, 0, 3}) {
t.Fatal("error packing custom int struct")
}
var i2 Int3Struct
if err := Unpack(&buf, &i2); err != nil {
t.Fatal(err)
}
if i2.I != 3 {
t.Fatal("error unpacking custom int struct")
}
}
// TODO: slices of custom types don't work yet
/*
type Int3SliceStruct struct {
I [2]Int3
}
func TestCustomSliceStruct(t *testing.T) {
var buf bytes.Buffer
i := Int3SliceStruct{[2]Int3{3, 4}}
if err := Pack(&buf, &i); err != nil {
t.Fatal(err)
}
if !bytes.Equal(buf.Bytes(), []byte{0, 0, 3}) {
t.Fatal("error packing custom int struct")
}
var i2 Int3SliceStruct
if err := Unpack(&buf, &i2); err != nil {
t.Fatal(err)
}
if i2.I[0] != 3 && i2.I[1] != 4 {
t.Fatal("error unpacking custom int struct")
}
}
*/
|
