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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 gob
import (
"bytes"
"math"
"os"
"reflect"
"strings"
"testing"
"unsafe"
)
// Guarantee encoding format by comparing some encodings to hand-written values
type EncodeT struct {
x uint64
b []byte
}
var encodeT = []EncodeT{
{0x00, []byte{0x00}},
{0x0F, []byte{0x0F}},
{0xFF, []byte{0xFF, 0xFF}},
{0xFFFF, []byte{0xFE, 0xFF, 0xFF}},
{0xFFFFFF, []byte{0xFD, 0xFF, 0xFF, 0xFF}},
{0xFFFFFFFF, []byte{0xFC, 0xFF, 0xFF, 0xFF, 0xFF}},
{0xFFFFFFFFFF, []byte{0xFB, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}},
{0xFFFFFFFFFFFF, []byte{0xFA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}},
{0xFFFFFFFFFFFFFF, []byte{0xF9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}},
{0xFFFFFFFFFFFFFFFF, []byte{0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}},
{0x1111, []byte{0xFE, 0x11, 0x11}},
{0x1111111111111111, []byte{0xF8, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}},
{0x8888888888888888, []byte{0xF8, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88}},
{1 << 63, []byte{0xF8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}},
}
// testError is meant to be used as a deferred function to turn a panic(gobError) into a
// plain test.Error call.
func testError(t *testing.T) {
if e := recover(); e != nil {
t.Error(e.(gobError).Error) // Will re-panic if not one of our errors, such as a runtime error.
}
return
}
// Test basic encode/decode routines for unsigned integers
func TestUintCodec(t *testing.T) {
defer testError(t)
b := new(bytes.Buffer)
encState := newEncoderState(nil, b)
for _, tt := range encodeT {
b.Reset()
encodeUint(encState, tt.x)
if !bytes.Equal(tt.b, b.Bytes()) {
t.Errorf("encodeUint: %#x encode: expected % x got % x", tt.x, tt.b, b.Bytes())
}
}
decState := newDecodeState(nil, &b)
for u := uint64(0); ; u = (u + 1) * 7 {
b.Reset()
encodeUint(encState, u)
v := decodeUint(decState)
if u != v {
t.Errorf("Encode/Decode: sent %#x received %#x", u, v)
}
if u&(1<<63) != 0 {
break
}
}
}
func verifyInt(i int64, t *testing.T) {
defer testError(t)
var b = new(bytes.Buffer)
encState := newEncoderState(nil, b)
encodeInt(encState, i)
decState := newDecodeState(nil, &b)
decState.buf = make([]byte, 8)
j := decodeInt(decState)
if i != j {
t.Errorf("Encode/Decode: sent %#x received %#x", uint64(i), uint64(j))
}
}
// Test basic encode/decode routines for signed integers
func TestIntCodec(t *testing.T) {
for u := uint64(0); ; u = (u + 1) * 7 {
// Do positive and negative values
i := int64(u)
verifyInt(i, t)
verifyInt(-i, t)
verifyInt(^i, t)
if u&(1<<63) != 0 {
break
}
}
verifyInt(-1<<63, t) // a tricky case
}
// The result of encoding a true boolean with field number 7
var boolResult = []byte{0x07, 0x01}
// The result of encoding a number 17 with field number 7
var signedResult = []byte{0x07, 2 * 17}
var unsignedResult = []byte{0x07, 17}
var floatResult = []byte{0x07, 0xFE, 0x31, 0x40}
// The result of encoding a number 17+19i with field number 7
var complexResult = []byte{0x07, 0xFE, 0x31, 0x40, 0xFE, 0x33, 0x40}
// The result of encoding "hello" with field number 7
var bytesResult = []byte{0x07, 0x05, 'h', 'e', 'l', 'l', 'o'}
func newencoderState(b *bytes.Buffer) *encoderState {
b.Reset()
state := newEncoderState(nil, b)
state.fieldnum = -1
return state
}
// Test instruction execution for encoding.
// Do not run the machine yet; instead do individual instructions crafted by hand.
func TestScalarEncInstructions(t *testing.T) {
var b = new(bytes.Buffer)
// bool
{
data := struct{ a bool }{true}
instr := &encInstr{encBool, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(boolResult, b.Bytes()) {
t.Errorf("bool enc instructions: expected % x got % x", boolResult, b.Bytes())
}
}
// int
{
b.Reset()
data := struct{ a int }{17}
instr := &encInstr{encInt, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(signedResult, b.Bytes()) {
t.Errorf("int enc instructions: expected % x got % x", signedResult, b.Bytes())
}
}
// uint
{
b.Reset()
data := struct{ a uint }{17}
instr := &encInstr{encUint, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(unsignedResult, b.Bytes()) {
t.Errorf("uint enc instructions: expected % x got % x", unsignedResult, b.Bytes())
}
}
// int8
{
b.Reset()
data := struct{ a int8 }{17}
instr := &encInstr{encInt8, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(signedResult, b.Bytes()) {
t.Errorf("int8 enc instructions: expected % x got % x", signedResult, b.Bytes())
}
}
// uint8
{
b.Reset()
data := struct{ a uint8 }{17}
instr := &encInstr{encUint8, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(unsignedResult, b.Bytes()) {
t.Errorf("uint8 enc instructions: expected % x got % x", unsignedResult, b.Bytes())
}
}
// int16
{
b.Reset()
data := struct{ a int16 }{17}
instr := &encInstr{encInt16, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(signedResult, b.Bytes()) {
t.Errorf("int16 enc instructions: expected % x got % x", signedResult, b.Bytes())
}
}
// uint16
{
b.Reset()
data := struct{ a uint16 }{17}
instr := &encInstr{encUint16, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(unsignedResult, b.Bytes()) {
t.Errorf("uint16 enc instructions: expected % x got % x", unsignedResult, b.Bytes())
}
}
// int32
{
b.Reset()
data := struct{ a int32 }{17}
instr := &encInstr{encInt32, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(signedResult, b.Bytes()) {
t.Errorf("int32 enc instructions: expected % x got % x", signedResult, b.Bytes())
}
}
// uint32
{
b.Reset()
data := struct{ a uint32 }{17}
instr := &encInstr{encUint32, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(unsignedResult, b.Bytes()) {
t.Errorf("uint32 enc instructions: expected % x got % x", unsignedResult, b.Bytes())
}
}
// int64
{
b.Reset()
data := struct{ a int64 }{17}
instr := &encInstr{encInt64, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(signedResult, b.Bytes()) {
t.Errorf("int64 enc instructions: expected % x got % x", signedResult, b.Bytes())
}
}
// uint64
{
b.Reset()
data := struct{ a uint64 }{17}
instr := &encInstr{encUint64, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(unsignedResult, b.Bytes()) {
t.Errorf("uint64 enc instructions: expected % x got % x", unsignedResult, b.Bytes())
}
}
// float
{
b.Reset()
data := struct{ a float }{17}
instr := &encInstr{encFloat, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(floatResult, b.Bytes()) {
t.Errorf("float enc instructions: expected % x got % x", floatResult, b.Bytes())
}
}
// float32
{
b.Reset()
data := struct{ a float32 }{17}
instr := &encInstr{encFloat32, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(floatResult, b.Bytes()) {
t.Errorf("float32 enc instructions: expected % x got % x", floatResult, b.Bytes())
}
}
// float64
{
b.Reset()
data := struct{ a float64 }{17}
instr := &encInstr{encFloat64, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(floatResult, b.Bytes()) {
t.Errorf("float64 enc instructions: expected % x got % x", floatResult, b.Bytes())
}
}
// bytes == []uint8
{
b.Reset()
data := struct{ a []byte }{[]byte("hello")}
instr := &encInstr{encUint8Array, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(bytesResult, b.Bytes()) {
t.Errorf("bytes enc instructions: expected % x got % x", bytesResult, b.Bytes())
}
}
// string
{
b.Reset()
data := struct{ a string }{"hello"}
instr := &encInstr{encString, 6, 0, 0}
state := newencoderState(b)
instr.op(instr, state, unsafe.Pointer(&data))
if !bytes.Equal(bytesResult, b.Bytes()) {
t.Errorf("string enc instructions: expected % x got % x", bytesResult, b.Bytes())
}
}
}
func execDec(typ string, instr *decInstr, state *decodeState, t *testing.T, p unsafe.Pointer) {
defer testError(t)
v := int(decodeUint(state))
if v+state.fieldnum != 6 {
t.Fatalf("decoding field number %d, got %d", 6, v+state.fieldnum)
}
instr.op(instr, state, decIndirect(p, instr.indir))
state.fieldnum = 6
}
func newDecodeStateFromData(data []byte) *decodeState {
b := bytes.NewBuffer(data)
state := newDecodeState(nil, &b)
state.fieldnum = -1
return state
}
// Test instruction execution for decoding.
// Do not run the machine yet; instead do individual instructions crafted by hand.
func TestScalarDecInstructions(t *testing.T) {
ovfl := os.ErrorString("overflow")
// bool
{
var data struct {
a bool
}
instr := &decInstr{decBool, 6, 0, 0, ovfl}
state := newDecodeStateFromData(boolResult)
execDec("bool", instr, state, t, unsafe.Pointer(&data))
if data.a != true {
t.Errorf("bool a = %v not true", data.a)
}
}
// int
{
var data struct {
a int
}
instr := &decInstr{decOpMap[reflect.Int], 6, 0, 0, ovfl}
state := newDecodeStateFromData(signedResult)
execDec("int", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
}
// uint
{
var data struct {
a uint
}
instr := &decInstr{decOpMap[reflect.Uint], 6, 0, 0, ovfl}
state := newDecodeStateFromData(unsignedResult)
execDec("uint", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("uint a = %v not 17", data.a)
}
}
// int8
{
var data struct {
a int8
}
instr := &decInstr{decInt8, 6, 0, 0, ovfl}
state := newDecodeStateFromData(signedResult)
execDec("int8", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("int8 a = %v not 17", data.a)
}
}
// uint8
{
var data struct {
a uint8
}
instr := &decInstr{decUint8, 6, 0, 0, ovfl}
state := newDecodeStateFromData(unsignedResult)
execDec("uint8", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("uint8 a = %v not 17", data.a)
}
}
// int16
{
var data struct {
a int16
}
instr := &decInstr{decInt16, 6, 0, 0, ovfl}
state := newDecodeStateFromData(signedResult)
execDec("int16", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("int16 a = %v not 17", data.a)
}
}
// uint16
{
var data struct {
a uint16
}
instr := &decInstr{decUint16, 6, 0, 0, ovfl}
state := newDecodeStateFromData(unsignedResult)
execDec("uint16", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("uint16 a = %v not 17", data.a)
}
}
// int32
{
var data struct {
a int32
}
instr := &decInstr{decInt32, 6, 0, 0, ovfl}
state := newDecodeStateFromData(signedResult)
execDec("int32", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("int32 a = %v not 17", data.a)
}
}
// uint32
{
var data struct {
a uint32
}
instr := &decInstr{decUint32, 6, 0, 0, ovfl}
state := newDecodeStateFromData(unsignedResult)
execDec("uint32", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("uint32 a = %v not 17", data.a)
}
}
// uintptr
{
var data struct {
a uintptr
}
instr := &decInstr{decOpMap[reflect.Uintptr], 6, 0, 0, ovfl}
state := newDecodeStateFromData(unsignedResult)
execDec("uintptr", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("uintptr a = %v not 17", data.a)
}
}
// int64
{
var data struct {
a int64
}
instr := &decInstr{decInt64, 6, 0, 0, ovfl}
state := newDecodeStateFromData(signedResult)
execDec("int64", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("int64 a = %v not 17", data.a)
}
}
// uint64
{
var data struct {
a uint64
}
instr := &decInstr{decUint64, 6, 0, 0, ovfl}
state := newDecodeStateFromData(unsignedResult)
execDec("uint64", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("uint64 a = %v not 17", data.a)
}
}
// float
{
var data struct {
a float
}
instr := &decInstr{decOpMap[reflect.Float], 6, 0, 0, ovfl}
state := newDecodeStateFromData(floatResult)
execDec("float", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("float a = %v not 17", data.a)
}
}
// float32
{
var data struct {
a float32
}
instr := &decInstr{decFloat32, 6, 0, 0, ovfl}
state := newDecodeStateFromData(floatResult)
execDec("float32", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("float32 a = %v not 17", data.a)
}
}
// float64
{
var data struct {
a float64
}
instr := &decInstr{decFloat64, 6, 0, 0, ovfl}
state := newDecodeStateFromData(floatResult)
execDec("float64", instr, state, t, unsafe.Pointer(&data))
if data.a != 17 {
t.Errorf("float64 a = %v not 17", data.a)
}
}
// complex
{
var data struct {
a complex
}
instr := &decInstr{decOpMap[reflect.Complex], 6, 0, 0, ovfl}
state := newDecodeStateFromData(complexResult)
execDec("complex", instr, state, t, unsafe.Pointer(&data))
if data.a != 17+19i {
t.Errorf("complex a = %v not 17+19i", data.a)
}
}
// complex64
{
var data struct {
a complex64
}
instr := &decInstr{decOpMap[reflect.Complex64], 6, 0, 0, ovfl}
state := newDecodeStateFromData(complexResult)
execDec("complex", instr, state, t, unsafe.Pointer(&data))
if data.a != 17+19i {
t.Errorf("complex a = %v not 17+19i", data.a)
}
}
// complex128
{
var data struct {
a complex128
}
instr := &decInstr{decOpMap[reflect.Complex128], 6, 0, 0, ovfl}
state := newDecodeStateFromData(complexResult)
execDec("complex", instr, state, t, unsafe.Pointer(&data))
if data.a != 17+19i {
t.Errorf("complex a = %v not 17+19i", data.a)
}
}
// bytes == []uint8
{
var data struct {
a []byte
}
instr := &decInstr{decUint8Array, 6, 0, 0, ovfl}
state := newDecodeStateFromData(bytesResult)
execDec("bytes", instr, state, t, unsafe.Pointer(&data))
if string(data.a) != "hello" {
t.Errorf(`bytes a = %q not "hello"`, string(data.a))
}
}
// string
{
var data struct {
a string
}
instr := &decInstr{decString, 6, 0, 0, ovfl}
state := newDecodeStateFromData(bytesResult)
execDec("bytes", instr, state, t, unsafe.Pointer(&data))
if data.a != "hello" {
t.Errorf(`bytes a = %q not "hello"`, data.a)
}
}
}
func TestEndToEnd(t *testing.T) {
type T2 struct {
t string
}
s1 := "string1"
s2 := "string2"
type T1 struct {
a, b, c int
m map[string]*float
n *[3]float
strs *[2]string
int64s *[]int64
ri complex64
s string
y []byte
t *T2
}
pi := 3.14159
e := 2.71828
t1 := &T1{
a: 17,
b: 18,
c: -5,
m: map[string]*float{"pi": &pi, "e": &e},
n: &[3]float{1.5, 2.5, 3.5},
strs: &[2]string{s1, s2},
int64s: &[]int64{77, 89, 123412342134},
ri: 17 - 23i,
s: "Now is the time",
y: []byte("hello, sailor"),
t: &T2{"this is T2"},
}
b := new(bytes.Buffer)
err := NewEncoder(b).Encode(t1)
if err != nil {
t.Error("encode:", err)
}
var _t1 T1
err = NewDecoder(b).Decode(&_t1)
if err != nil {
t.Fatal("decode:", err)
}
if !reflect.DeepEqual(t1, &_t1) {
t.Errorf("encode expected %v got %v", *t1, _t1)
}
}
func TestOverflow(t *testing.T) {
type inputT struct {
maxi int64
mini int64
maxu uint64
maxf float64
minf float64
maxc complex128
minc complex128
}
var it inputT
var err os.Error
b := new(bytes.Buffer)
enc := NewEncoder(b)
dec := NewDecoder(b)
// int8
b.Reset()
it = inputT{
maxi: math.MaxInt8 + 1,
}
type outi8 struct {
maxi int8
mini int8
}
var o1 outi8
enc.Encode(it)
err = dec.Decode(&o1)
if err == nil || err.String() != `value for "maxi" out of range` {
t.Error("wrong overflow error for int8:", err)
}
it = inputT{
mini: math.MinInt8 - 1,
}
b.Reset()
enc.Encode(it)
err = dec.Decode(&o1)
if err == nil || err.String() != `value for "mini" out of range` {
t.Error("wrong underflow error for int8:", err)
}
// int16
b.Reset()
it = inputT{
maxi: math.MaxInt16 + 1,
}
type outi16 struct {
maxi int16
mini int16
}
var o2 outi16
enc.Encode(it)
err = dec.Decode(&o2)
if err == nil || err.String() != `value for "maxi" out of range` {
t.Error("wrong overflow error for int16:", err)
}
it = inputT{
mini: math.MinInt16 - 1,
}
b.Reset()
enc.Encode(it)
err = dec.Decode(&o2)
if err == nil || err.String() != `value for "mini" out of range` {
t.Error("wrong underflow error for int16:", err)
}
// int32
b.Reset()
it = inputT{
maxi: math.MaxInt32 + 1,
}
type outi32 struct {
maxi int32
mini int32
}
var o3 outi32
enc.Encode(it)
err = dec.Decode(&o3)
if err == nil || err.String() != `value for "maxi" out of range` {
t.Error("wrong overflow error for int32:", err)
}
it = inputT{
mini: math.MinInt32 - 1,
}
b.Reset()
enc.Encode(it)
err = dec.Decode(&o3)
if err == nil || err.String() != `value for "mini" out of range` {
t.Error("wrong underflow error for int32:", err)
}
// uint8
b.Reset()
it = inputT{
maxu: math.MaxUint8 + 1,
}
type outu8 struct {
maxu uint8
}
var o4 outu8
enc.Encode(it)
err = dec.Decode(&o4)
if err == nil || err.String() != `value for "maxu" out of range` {
t.Error("wrong overflow error for uint8:", err)
}
// uint16
b.Reset()
it = inputT{
maxu: math.MaxUint16 + 1,
}
type outu16 struct {
maxu uint16
}
var o5 outu16
enc.Encode(it)
err = dec.Decode(&o5)
if err == nil || err.String() != `value for "maxu" out of range` {
t.Error("wrong overflow error for uint16:", err)
}
// uint32
b.Reset()
it = inputT{
maxu: math.MaxUint32 + 1,
}
type outu32 struct {
maxu uint32
}
var o6 outu32
enc.Encode(it)
err = dec.Decode(&o6)
if err == nil || err.String() != `value for "maxu" out of range` {
t.Error("wrong overflow error for uint32:", err)
}
// float32
b.Reset()
it = inputT{
maxf: math.MaxFloat32 * 2,
}
type outf32 struct {
maxf float32
minf float32
}
var o7 outf32
enc.Encode(it)
err = dec.Decode(&o7)
if err == nil || err.String() != `value for "maxf" out of range` {
t.Error("wrong overflow error for float32:", err)
}
// complex64
b.Reset()
it = inputT{
maxc: cmplx(math.MaxFloat32*2, math.MaxFloat32*2),
}
type outc64 struct {
maxc complex64
minc complex64
}
var o8 outc64
enc.Encode(it)
err = dec.Decode(&o8)
if err == nil || err.String() != `value for "maxc" out of range` {
t.Error("wrong overflow error for complex64:", err)
}
}
func TestNesting(t *testing.T) {
type RT struct {
a string
next *RT
}
rt := new(RT)
rt.a = "level1"
rt.next = new(RT)
rt.next.a = "level2"
b := new(bytes.Buffer)
NewEncoder(b).Encode(rt)
var drt RT
dec := NewDecoder(b)
err := dec.Decode(&drt)
if err != nil {
t.Error("decoder error:", err)
}
if drt.a != rt.a {
t.Errorf("nesting: encode expected %v got %v", *rt, drt)
}
if drt.next == nil {
t.Errorf("nesting: recursion failed")
}
if drt.next.a != rt.next.a {
t.Errorf("nesting: encode expected %v got %v", *rt.next, *drt.next)
}
}
// These three structures have the same data with different indirections
type T0 struct {
a int
b int
c int
d int
}
type T1 struct {
a int
b *int
c **int
d ***int
}
type T2 struct {
a ***int
b **int
c *int
d int
}
func TestAutoIndirection(t *testing.T) {
// First transfer t1 into t0
var t1 T1
t1.a = 17
t1.b = new(int)
*t1.b = 177
t1.c = new(*int)
*t1.c = new(int)
**t1.c = 1777
t1.d = new(**int)
*t1.d = new(*int)
**t1.d = new(int)
***t1.d = 17777
b := new(bytes.Buffer)
enc := NewEncoder(b)
enc.Encode(t1)
dec := NewDecoder(b)
var t0 T0
dec.Decode(&t0)
if t0.a != 17 || t0.b != 177 || t0.c != 1777 || t0.d != 17777 {
t.Errorf("t1->t0: expected {17 177 1777 17777}; got %v", t0)
}
// Now transfer t2 into t0
var t2 T2
t2.d = 17777
t2.c = new(int)
*t2.c = 1777
t2.b = new(*int)
*t2.b = new(int)
**t2.b = 177
t2.a = new(**int)
*t2.a = new(*int)
**t2.a = new(int)
***t2.a = 17
b.Reset()
enc.Encode(t2)
t0 = T0{}
dec.Decode(&t0)
if t0.a != 17 || t0.b != 177 || t0.c != 1777 || t0.d != 17777 {
t.Errorf("t2->t0 expected {17 177 1777 17777}; got %v", t0)
}
// Now transfer t0 into t1
t0 = T0{17, 177, 1777, 17777}
b.Reset()
enc.Encode(t0)
t1 = T1{}
dec.Decode(&t1)
if t1.a != 17 || *t1.b != 177 || **t1.c != 1777 || ***t1.d != 17777 {
t.Errorf("t0->t1 expected {17 177 1777 17777}; got {%d %d %d %d}", t1.a, *t1.b, **t1.c, ***t1.d)
}
// Now transfer t0 into t2
b.Reset()
enc.Encode(t0)
t2 = T2{}
dec.Decode(&t2)
if ***t2.a != 17 || **t2.b != 177 || *t2.c != 1777 || t2.d != 17777 {
t.Errorf("t0->t2 expected {17 177 1777 17777}; got {%d %d %d %d}", ***t2.a, **t2.b, *t2.c, t2.d)
}
// Now do t2 again but without pre-allocated pointers.
b.Reset()
enc.Encode(t0)
***t2.a = 0
**t2.b = 0
*t2.c = 0
t2.d = 0
dec.Decode(&t2)
if ***t2.a != 17 || **t2.b != 177 || *t2.c != 1777 || t2.d != 17777 {
t.Errorf("t0->t2 expected {17 177 1777 17777}; got {%d %d %d %d}", ***t2.a, **t2.b, *t2.c, t2.d)
}
}
type RT0 struct {
a int
b string
c float
}
type RT1 struct {
c float
b string
a int
notSet string
}
func TestReorderedFields(t *testing.T) {
var rt0 RT0
rt0.a = 17
rt0.b = "hello"
rt0.c = 3.14159
b := new(bytes.Buffer)
NewEncoder(b).Encode(rt0)
dec := NewDecoder(b)
var rt1 RT1
// Wire type is RT0, local type is RT1.
err := dec.Decode(&rt1)
if err != nil {
t.Error("decode error:", err)
}
if rt0.a != rt1.a || rt0.b != rt1.b || rt0.c != rt1.c {
t.Errorf("rt1->rt0: expected %v; got %v", rt0, rt1)
}
}
// Like an RT0 but with fields we'll ignore on the decode side.
type IT0 struct {
a int64
b string
ignore_d []int
ignore_e [3]float
ignore_f bool
ignore_g string
ignore_h []byte
ignore_i *RT1
ignore_m map[string]int
c float
}
func TestIgnoredFields(t *testing.T) {
var it0 IT0
it0.a = 17
it0.b = "hello"
it0.c = 3.14159
it0.ignore_d = []int{1, 2, 3}
it0.ignore_e[0] = 1.0
it0.ignore_e[1] = 2.0
it0.ignore_e[2] = 3.0
it0.ignore_f = true
it0.ignore_g = "pay no attention"
it0.ignore_h = []byte("to the curtain")
it0.ignore_i = &RT1{3.1, "hi", 7, "hello"}
it0.ignore_m = map[string]int{"one": 1, "two": 2}
b := new(bytes.Buffer)
NewEncoder(b).Encode(it0)
dec := NewDecoder(b)
var rt1 RT1
// Wire type is IT0, local type is RT1.
err := dec.Decode(&rt1)
if err != nil {
t.Error("error: ", err)
}
if int(it0.a) != rt1.a || it0.b != rt1.b || it0.c != rt1.c {
t.Errorf("rt1->rt0: expected %v; got %v", it0, rt1)
}
}
type Bad0 struct {
ch chan int
c float
}
var nilEncoder *Encoder
func TestInvalidField(t *testing.T) {
var bad0 Bad0
bad0.ch = make(chan int)
b := new(bytes.Buffer)
err := nilEncoder.encode(b, reflect.NewValue(&bad0))
if err == nil {
t.Error("expected error; got none")
} else if strings.Index(err.String(), "type") < 0 {
t.Error("expected type error; got", err)
}
}
type Indirect struct {
a ***[3]int
s ***[]int
m ****map[string]int
}
type Direct struct {
a [3]int
s []int
m map[string]int
}
func TestIndirectSliceMapArray(t *testing.T) {
// Marshal indirect, unmarshal to direct.
i := new(Indirect)
i.a = new(**[3]int)
*i.a = new(*[3]int)
**i.a = new([3]int)
***i.a = [3]int{1, 2, 3}
i.s = new(**[]int)
*i.s = new(*[]int)
**i.s = new([]int)
***i.s = []int{4, 5, 6}
i.m = new(***map[string]int)
*i.m = new(**map[string]int)
**i.m = new(*map[string]int)
***i.m = new(map[string]int)
****i.m = map[string]int{"one": 1, "two": 2, "three": 3}
b := new(bytes.Buffer)
NewEncoder(b).Encode(i)
dec := NewDecoder(b)
var d Direct
err := dec.Decode(&d)
if err != nil {
t.Error("error: ", err)
}
if len(d.a) != 3 || d.a[0] != 1 || d.a[1] != 2 || d.a[2] != 3 {
t.Errorf("indirect to direct: d.a is %v not %v", d.a, ***i.a)
}
if len(d.s) != 3 || d.s[0] != 4 || d.s[1] != 5 || d.s[2] != 6 {
t.Errorf("indirect to direct: d.s is %v not %v", d.s, ***i.s)
}
if len(d.m) != 3 || d.m["one"] != 1 || d.m["two"] != 2 || d.m["three"] != 3 {
t.Errorf("indirect to direct: d.m is %v not %v", d.m, ***i.m)
}
// Marshal direct, unmarshal to indirect.
d.a = [3]int{11, 22, 33}
d.s = []int{44, 55, 66}
d.m = map[string]int{"four": 4, "five": 5, "six": 6}
i = new(Indirect)
b.Reset()
NewEncoder(b).Encode(d)
dec = NewDecoder(b)
err = dec.Decode(&i)
if err != nil {
t.Error("error: ", err)
}
if len(***i.a) != 3 || (***i.a)[0] != 11 || (***i.a)[1] != 22 || (***i.a)[2] != 33 {
t.Errorf("direct to indirect: ***i.a is %v not %v", ***i.a, d.a)
}
if len(***i.s) != 3 || (***i.s)[0] != 44 || (***i.s)[1] != 55 || (***i.s)[2] != 66 {
t.Errorf("direct to indirect: ***i.s is %v not %v", ***i.s, ***i.s)
}
if len(****i.m) != 3 || (****i.m)["four"] != 4 || (****i.m)["five"] != 5 || (****i.m)["six"] != 6 {
t.Errorf("direct to indirect: ****i.m is %v not %v", ****i.m, d.m)
}
}
// An interface with several implementations
type Squarer interface {
Square() int
}
type Int int
func (i Int) Square() int {
return int(i * i)
}
type Float float
func (f Float) Square() int {
return int(f * f)
}
type Vector []int
func (v Vector) Square() int {
sum := 0
for _, x := range v {
sum += x * x
}
return sum
}
type Point struct {
a, b int
}
func (p Point) Square() int {
return p.a*p.a + p.b*p.b
}
// A struct with interfaces in it.
type InterfaceItem struct {
i int
sq1, sq2, sq3 Squarer
f float
sq []Squarer
}
// The same struct without interfaces
type NoInterfaceItem struct {
i int
f float
}
func TestInterface(t *testing.T) {
iVal := Int(3)
fVal := Float(5)
// Sending a Vector will require that the receiver define a type in the middle of
// receiving the value for item2.
vVal := Vector{1, 2, 3}
b := new(bytes.Buffer)
item1 := &InterfaceItem{1, iVal, fVal, vVal, 11.5, []Squarer{iVal, fVal, nil, vVal}}
// Register the types.
Register(Int(0))
Register(Float(0))
Register(Vector{})
err := NewEncoder(b).Encode(item1)
if err != nil {
t.Error("expected no encode error; got", err)
}
item2 := InterfaceItem{}
err = NewDecoder(b).Decode(&item2)
if err != nil {
t.Fatal("decode:", err)
}
if item2.i != item1.i {
t.Error("normal int did not decode correctly")
}
if item2.sq1 == nil || item2.sq1.Square() != iVal.Square() {
t.Error("Int did not decode correctly")
}
if item2.sq2 == nil || item2.sq2.Square() != fVal.Square() {
t.Error("Float did not decode correctly")
}
if item2.sq3 == nil || item2.sq3.Square() != vVal.Square() {
t.Error("Vector did not decode correctly")
}
if item2.f != item1.f {
t.Error("normal float did not decode correctly")
}
// Now check that we received a slice of Squarers correctly, including a nil element
if len(item1.sq) != len(item2.sq) {
t.Fatalf("[]Squarer length wrong: got %d; expected %d", len(item2.sq), len(item1.sq))
}
for i, v1 := range item1.sq {
v2 := item2.sq[i]
if v1 == nil || v2 == nil {
if v1 != nil || v2 != nil {
t.Errorf("item %d inconsistent nils", i)
}
continue
if v1.Square() != v2.Square() {
t.Errorf("item %d inconsistent values: %v %v", i, v1, v2)
}
}
}
}
// A struct with all basic types, stored in interfaces.
type BasicInterfaceItem struct {
Int, Int8, Int16, Int32, Int64 interface{}
Uint, Uint8, Uint16, Uint32, Uint64 interface{}
Float, Float32, Float64 interface{}
Complex, Complex64, Complex128 interface{}
Bool interface{}
String interface{}
Bytes interface{}
}
func TestInterfaceBasic(t *testing.T) {
b := new(bytes.Buffer)
item1 := &BasicInterfaceItem{
int(1), int8(1), int16(1), int32(1), int64(1),
uint(1), uint8(1), uint16(1), uint32(1), uint64(1),
float(1), float32(1), float64(1),
complex(0i), complex64(0i), complex128(0i),
true,
"hello",
[]byte("sailor"),
}
err := NewEncoder(b).Encode(item1)
if err != nil {
t.Error("expected no encode error; got", err)
}
item2 := &BasicInterfaceItem{}
err = NewDecoder(b).Decode(&item2)
if err != nil {
t.Fatal("decode:", err)
}
if !reflect.DeepEqual(item1, item2) {
t.Errorf("encode expected %v got %v", item1, item2)
}
// Hand check a couple for correct types.
if v, ok := item2.Bool.(bool); !ok || !v {
t.Error("boolean should be true")
}
if v, ok := item2.String.(string); !ok || v != item1.String.(string) {
t.Errorf("string should be %v is %v", item1.String, v)
}
}
type String string
type PtrInterfaceItem struct {
str interface{} // basic
Str interface{} // derived
}
// We'll send pointers; should receive values.
// Also check that we can register T but send *T.
func TestInterfacePointer(t *testing.T) {
b := new(bytes.Buffer)
str1 := "howdy"
str2 := String("kiddo")
item1 := &PtrInterfaceItem{
&str1,
&str2,
}
// Register the type.
Register(str2)
err := NewEncoder(b).Encode(item1)
if err != nil {
t.Error("expected no encode error; got", err)
}
item2 := &PtrInterfaceItem{}
err = NewDecoder(b).Decode(&item2)
if err != nil {
t.Fatal("decode:", err)
}
// Hand test for correct types and values.
if v, ok := item2.str.(string); !ok || v != str1 {
t.Errorf("basic string failed: %q should be %q", v, str1)
}
if v, ok := item2.Str.(String); !ok || v != str2 {
t.Errorf("derived type String failed: %q should be %q", v, str2)
}
}
func TestIgnoreInterface(t *testing.T) {
iVal := Int(3)
fVal := Float(5)
// Sending a Point will require that the receiver define a type in the middle of
// receiving the value for item2.
pVal := Point{2, 3}
b := new(bytes.Buffer)
item1 := &InterfaceItem{1, iVal, fVal, pVal, 11.5, nil}
// Register the types.
Register(Int(0))
Register(Float(0))
Register(Point{})
err := NewEncoder(b).Encode(item1)
if err != nil {
t.Error("expected no encode error; got", err)
}
item2 := NoInterfaceItem{}
err = NewDecoder(b).Decode(&item2)
if err != nil {
t.Fatal("decode:", err)
}
if item2.i != item1.i {
t.Error("normal int did not decode correctly")
}
if item2.f != item2.f {
t.Error("normal float did not decode correctly")
}
}
// A type that won't be defined in the gob until we send it in an interface value.
type OnTheFly struct {
a int
}
type DT struct {
// X OnTheFly
a int
b string
c float
i interface{}
j interface{}
i_nil interface{}
m map[string]int
r [3]int
s []string
}
func TestDebug(t *testing.T) {
if debugFunc == nil {
return
}
Register(OnTheFly{})
var dt DT
dt.a = 17
dt.b = "hello"
dt.c = 3.14159
dt.i = 271828
dt.j = OnTheFly{3}
dt.i_nil = nil
dt.m = map[string]int{"one": 1, "two": 2}
dt.r = [3]int{11, 22, 33}
dt.s = []string{"hi", "joe"}
b := new(bytes.Buffer)
err := NewEncoder(b).Encode(dt)
if err != nil {
t.Fatal("encode:", err)
}
debugBuffer := bytes.NewBuffer(b.Bytes())
dt2 := &DT{}
err = NewDecoder(b).Decode(&dt2)
if err != nil {
t.Error("decode:", err)
}
debugFunc(debugBuffer)
}