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encoder_test.go
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encoder_test.go
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package scale
import (
"bytes"
"encoding/hex"
"math"
"testing"
"github.com/stretchr/testify/require"
)
type customBuffer struct {
buf bytes.Buffer
}
func (c *customBuffer) Write(b []byte) (int, error) {
return c.buf.Write(b)
}
func (c *customBuffer) Len() int {
return c.buf.Len()
}
func BenchmarkEncodeStrings_WithStringWriter(b *testing.B) {
// bytes.Buffer implements the io.StringWriter interface.
var buf bytes.Buffer
enc := NewEncoder(&buf)
for i := 0; i < b.N; i++ {
EncodeString(enc, "Hello World")
}
}
func BenchmarkEncodeStrings_WithWriterForStrings(b *testing.B) {
// CustomBuffer does not implement the io.StringWriter interface.
var buf customBuffer
enc := NewEncoder(&buf)
for i := 0; i < b.N; i++ {
EncodeString(enc, "Hello World")
}
}
type compactTestCase[T any] struct {
value T
expect []byte
}
func uint8CompactTestCases() []compactTestCase[uint8] {
return []compactTestCase[uint8]{
{0, []byte{0b0000_0000}},
{1, []byte{0b0000_0100}},
{maxUint6, []byte{0b1111_1100}},
{maxUint8, []byte{0b1111_1101, 0b0000_0011}},
}
}
func uint16CompactTestCases() []compactTestCase[uint16] {
return []compactTestCase[uint16]{
{0, []byte{0b0000_0000}},
{1, []byte{0b0000_0100}},
{maxUint6, []byte{0b1111_1100}},
{maxUint8, []byte{0b1111_1101, 0b0000_0011}},
{maxUint14, []byte{0b1111_1101, 0b1111_1111}},
{maxUint14 + 1, []byte{0b0000_0010, 0b0000_0000, 0b0000_0001, 0b0000_0000}},
{maxUint16, []byte{0b1111_1110, 0b1111_1111, 0b0000_0011, 0b0000_0000}},
}
}
func uint32CompactTestCases() []compactTestCase[uint32] {
return []compactTestCase[uint32]{
{0, []byte{0b0000_0000}},
{1, []byte{0b0000_0100}},
{maxUint6, []byte{0b1111_1100}},
{maxUint8, []byte{0b1111_1101, 0b0000_0011}},
{maxUint14, []byte{0b1111_1101, 0b1111_1111}},
{maxUint14 + 1, []byte{0b0000_0010, 0b0000_0000, 0b0000_0001, 0b0000_0000}},
{maxUint16, []byte{0b1111_1110, 0b1111_1111, 0b0000_0011, 0b0000_0000}},
{maxUint30, []byte{0b1111_1110, 0b1111_1111, 0b1111_1111, 0b1111_1111}},
{maxUint30 + 1, []byte{0b0000_0011, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0100_0000}},
{math.MaxUint32, []byte{0b0000_0011, 0b1111_1111, 0b1111_1111, 0b1111_1111, 0b1111_1111}},
}
}
func uint64CompactTestCases() []compactTestCase[uint64] {
return []compactTestCase[uint64]{
{0, []byte{0b0000_0000}},
{1, []byte{0b0000_0100}},
{maxUint6, []byte{0b1111_1100}},
{maxUint8, []byte{0b1111_1101, 0b0000_0011}},
{maxUint14, []byte{0b1111_1101, 0b1111_1111}},
{maxUint14 + 1, []byte{0b0000_0010, 0b0000_0000, 0b0000_0001, 0b0000_0000}},
{maxUint16, []byte{0b1111_1110, 0b1111_1111, 0b0000_0011, 0b0000_0000}},
{maxUint30, []byte{0b1111_1110, 0b1111_1111, 0b1111_1111, 0b1111_1111}},
{maxUint30 + 1, []byte{0b0000_0011, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0100_0000}},
{math.MaxUint32, []byte{0b0000_0011, 0b1111_1111, 0b1111_1111, 0b1111_1111, 0b1111_1111}},
{math.MaxUint32 + 1, []byte{0b0000_0111, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0000_0001}},
{1 << 40, []byte{0b0000_1011, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0000_0000, 0b0000_0001}},
{1 << 48, []byte{
0b0000_1111,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0001,
}},
{1 << 56, []byte{
0b0001_0011,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0000,
0b0000_0001,
}},
{math.MaxUint64, []byte{
0b0001_0011,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
}},
}
}
func intPtr[T ~uint8 | ~uint16 | ~uint32 | ~uint64](v T) *T {
return &v
}
func uint8PtrTestCases() []compactTestCase[*uint8] {
return []compactTestCase[*uint8]{
{nil, []byte{0}},
{intPtr[uint8](1), []byte{1, 0b0000_0100}},
{intPtr[uint8](maxUint6), []byte{1, 0b1111_1100}},
{intPtr[uint8](maxUint8), []byte{1, 0b1111_1101, 0b0000_0011}},
}
}
func uint16PtrTestCases() []compactTestCase[*uint16] {
return []compactTestCase[*uint16]{
{nil, []byte{0}},
{intPtr[uint16](maxUint8), []byte{1, 0b1111_1101, 0b0000_0011}},
{intPtr[uint16](maxUint16), []byte{1, 0b1111_1110, 0b1111_1111, 0b0000_0011, 0b0000_0000}},
}
}
func uint32PtrTestCases() []compactTestCase[*uint32] {
return []compactTestCase[*uint32]{
{nil, []byte{0}},
{intPtr[uint32](maxUint8), []byte{1, 0b1111_1101, 0b0000_0011}},
{intPtr[uint32](maxUint16), []byte{1, 0b1111_1110, 0b1111_1111, 0b0000_0011, 0b0000_0000}},
{intPtr[uint32](maxUint30), []byte{1, 0b1111_1110, 0b1111_1111, 0b1111_1111, 0b1111_1111}},
{intPtr[uint32](math.MaxUint32), []byte{
1,
0b0000_0011,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
}},
}
}
func uint64PtrTestCases() []compactTestCase[*uint64] {
return []compactTestCase[*uint64]{
{nil, []byte{0}},
{intPtr[uint64](maxUint8), []byte{1, 0b1111_1101, 0b0000_0011}},
{intPtr[uint64](maxUint16), []byte{1, 0b1111_1110, 0b1111_1111, 0b0000_0011, 0b0000_0000}},
{intPtr[uint64](math.MaxUint32), []byte{
1,
0b0000_0011,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
}},
{intPtr[uint64](math.MaxUint64), []byte{
1,
0b0001_0011,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
0b1111_1111,
}},
}
}
func mustDecodeHex(hexStr string) []byte {
b, err := hex.DecodeString(hexStr)
if err != nil {
panic(err)
}
return b
}
func uint16SliceTestCases() []compactTestCase[[]uint16] {
return []compactTestCase[[]uint16]{
{[]uint16{4, 15, 23, math.MaxUint16}, mustDecodeHex("10103c5cfeff0300")},
}
}
func uint32SliceTestCases() []compactTestCase[[]uint32] {
return []compactTestCase[[]uint32]{
{[]uint32{4, 15, 23, math.MaxUint32}, mustDecodeHex("10103c5c03ffffffff")},
}
}
func uint64SliceTestCases() []compactTestCase[[]uint64] {
return []compactTestCase[[]uint64]{
{[]uint64{4, 15, 23, math.MaxUint64}, mustDecodeHex("10103c5c13ffffffffffffffff")},
}
}
func testEncodeCompactIntegers[T any](
t *testing.T,
name string,
tcs []compactTestCase[T],
encode func(enc *Encoder, value T) (int, error),
) {
t.Run(name, func(t *testing.T) {
for _, tc := range tcs {
t.Run("", func(t *testing.T) {
buf := bytes.NewBuffer(nil)
enc := NewEncoder(buf)
_, err := encode(enc, tc.value)
require.NoError(t, err)
require.Equal(t, tc.expect, buf.Bytes())
})
}
})
}
func TestEncodeCompactIntegers(t *testing.T) {
testEncodeCompactIntegers(t, "uint8", uint8CompactTestCases(), EncodeCompact8)
testEncodeCompactIntegers(t, "uint16", uint16CompactTestCases(), EncodeCompact16)
testEncodeCompactIntegers(t, "uint32", uint32CompactTestCases(), EncodeCompact32)
testEncodeCompactIntegers(t, "uint64", uint64CompactTestCases(), EncodeCompact64)
testEncodeCompactIntegers(t, "*uint8", uint8PtrTestCases(), EncodeCompact8Ptr)
testEncodeCompactIntegers(t, "*uint16", uint16PtrTestCases(), EncodeCompact16Ptr)
testEncodeCompactIntegers(t, "*uint32", uint32PtrTestCases(), EncodeCompact32Ptr)
testEncodeCompactIntegers(t, "*uint64", uint64PtrTestCases(), EncodeCompact64Ptr)
testEncodeCompactIntegers(t, "[]uint16", uint16SliceTestCases(), EncodeUint16Slice)
testEncodeCompactIntegers(t, "[]uint32", uint32SliceTestCases(), EncodeUint32Slice)
testEncodeCompactIntegers(t, "[]uint64", uint64SliceTestCases(), EncodeUint64Slice)
}
func testEncodeNonCompact[T any](
t *testing.T,
name string,
val T,
encoded []byte,
encode func(enc *Encoder, value T) (int, error),
) {
t.Run(name, func(t *testing.T) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
_, err := encode(enc, val)
require.NoError(t, err)
require.Equal(t, encoded, buf.Bytes())
})
}
func TestEncodeUint(t *testing.T) {
testEncodeNonCompact(
t, "uint8",
uint8(0x42),
[]byte{0x42},
EncodeByte,
)
testEncodeNonCompact(
t, "uint16",
uint16(0x1234),
[]byte{0x34, 0x12},
EncodeUint16)
testEncodeNonCompact(
t, "uint32",
uint32(0x12345678),
[]byte{0x78, 0x56, 0x34, 0x12},
EncodeUint32)
testEncodeNonCompact(
t, "uint64",
uint64(0x123456789abcdef0),
[]byte{0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12},
EncodeUint64,
)
}