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Initial implementation

This commit is contained in:
Matthias Fulz 2019-10-04 12:28:45 +02:00
commit 39ca0f2303
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# ---> Go
# Binaries for programs and plugins
*.exe
*.exe~
*.dll
*.so
*.dylib
# Test binary, build with `go test -c`
*.test
# Output of the go coverage tool, specifically when used with LiteIDE
*.out

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 , USA
Everyone is permitted to copy and distribute verbatim copies of this license
document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your freedom to share
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Copyright (C) <yyyy> <name of author>
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Also add information on how to contact you by electronic and paper mail.
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision'
(which makes passes at compilers) written by James Hacker.
< signature of Ty Coon > , 1 April 1989 Ty Coon, President of Vice This General
Public License does not permit incorporating your program into proprietary
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useful to permit linking proprietary applications with the library. If this
is what you want to do, use the GNU Lesser General Public License instead
of this License.

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# ssob
Stupid simple object binary
gob like serializer intended to be easy to port and fast

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package ssob
import (
"encoding/binary"
"errors"
"io"
"reflect"
"sync"
)
type Decoder struct {
mutex sync.Mutex
r io.Reader
}
func NewDecoder(r io.Reader) *Decoder {
dec := new(Decoder)
dec.r = r
return dec
}
func (dec *Decoder) Decode(e interface{}) (err error) {
return dec.DecodeValue(reflect.ValueOf(e))
}
func (dec *Decoder) DecodeValue(value reflect.Value) (err error) {
if value.Kind() == reflect.Invalid {
return errors.New("ssob: Cannot decode nil value")
}
if value.Kind() == reflect.Ptr && value.IsNil() {
return errors.New("ssob: Cannot decode nil of type " + value.Type().String())
}
dec.mutex.Lock()
defer dec.mutex.Unlock()
lb := make([]byte, 8)
err = binary.Read(dec.r, binary.BigEndian, lb)
if err != nil {
return err
}
l, n, err := unmarshalInt64(lb)
if err != nil || n != 8 {
return err
}
bb := make([]byte, l)
err = binary.Read(dec.r, binary.BigEndian, bb)
if err != nil {
return err
}
_, err = unmarshal(value.Interface(), bb)
return err
}

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package ssob
import (
"encoding/binary"
"errors"
"io"
"reflect"
"sync"
)
type Encoder struct {
mutex sync.Mutex
w io.Writer
}
func NewEncoder(w io.Writer) *Encoder {
enc := new(Encoder)
enc.w = w
return enc
}
func (enc *Encoder) Encode(e interface{}) (err error) {
return enc.EncodeValue(reflect.ValueOf(e))
}
func (enc *Encoder) EncodeValue(value reflect.Value) (err error) {
if value.Kind() == reflect.Invalid {
return errors.New("ssob: Cannot encode nil value")
}
if value.Kind() == reflect.Ptr && value.IsNil() {
return errors.New("ssob: Cannot encode nil of type " + value.Type().String())
}
b, err := marshal(value.Interface())
if err != nil {
return err
}
bb := marshalInt64(int64(len(b)))
bb = append(bb, b...)
enc.mutex.Lock()
defer enc.mutex.Unlock()
return binary.Write(enc.w, binary.BigEndian, bb)
}

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package ssob
import (
"encoding/binary"
"errors"
"reflect"
)
func marshalString(in string) (ret []byte) {
l := int64(len(in))
b := marshalInt64(l)
b = append(b, []byte(in)...)
return b
}
func marshalInt8(in int8) (ret []byte) {
return []byte{byte(in)}
}
func marshalUint8(in uint8) (ret []byte) {
return []byte{byte(in)}
}
func marshalInt16(in int16) (ret []byte) {
out := make([]byte, 2)
binary.BigEndian.PutUint16(out, uint16(in))
return out
}
func marshalUint16(in uint16) (ret []byte) {
out := make([]byte, 2)
binary.BigEndian.PutUint16(out, in)
return out
}
func marshalInt32(in int32) (ret []byte) {
out := make([]byte, 4)
binary.BigEndian.PutUint32(out, uint32(in))
return out
}
func marshalUint32(in uint32) (ret []byte) {
out := make([]byte, 4)
binary.BigEndian.PutUint32(out, in)
return out
}
func marshalFloat32(in float32) (ret []byte) {
out := make([]byte, 4)
binary.BigEndian.PutUint32(out, uint32(in))
return out
}
func marshalInt64(in int64) (ret []byte) {
out := make([]byte, 8)
binary.BigEndian.PutUint64(out, uint64(in))
return out
}
func marshalUint64(in uint64) (ret []byte) {
out := make([]byte, 8)
binary.BigEndian.PutUint64(out, in)
return out
}
func marshalFloat64(in float64) (ret []byte) {
out := make([]byte, 8)
binary.BigEndian.PutUint64(out, uint64(in))
return out
}
type marshalFunc func(e interface{}) (ret []byte, err error)
var encoderCache map[string]marshalFunc
func init() {
encoderCache = make(map[string]marshalFunc)
encRegister(int8(0))
encRegister(uint8(0))
encRegister(int16(0))
encRegister(uint16(0))
encRegister(int32(0))
encRegister(uint32(0))
encRegister(float32(0))
encRegister(int64(0))
encRegister(uint64(0))
encRegister(float64(0))
encRegister(string(""))
}
func encRegister(e interface{}) (err error) {
v := reflect.ValueOf(e)
t := reflect.TypeOf(e)
switch t.Kind() {
case reflect.Invalid:
return errors.New("ssob: Invalid type")
case reflect.Slice:
f := func(e interface{}) (ret []byte, err error) {
v := reflect.ValueOf(e)
l := v.Len()
ret, err = marshal(int64(l))
if err != nil {
return nil, err
}
for i := 0; i < l; i++ {
b, err := marshal(v.Index(i).Interface())
if err != nil {
return nil, err
}
ret = append(ret, b...)
}
return ret, nil
}
encoderCache[string(t.Kind())] = f
case reflect.Struct:
f := func(e interface{}) (ret []byte, err error) {
n := v.NumField()
ret = []byte{}
for i := 0; i < n; i++ {
b, err := marshal(v.Field(i).Interface())
if err != nil {
return nil, err
}
ret = append(ret, b...)
}
return ret, nil
}
encoderCache[t.Name()] = f
case reflect.Int8:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(int8); ok {
return marshalInt8(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected int8")
}
encoderCache[string(v.Kind())] = f
case reflect.Uint8:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(uint8); ok {
return marshalUint8(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected uint8")
}
encoderCache[string(v.Kind())] = f
case reflect.Int16:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(int16); ok {
return marshalInt16(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected int16")
}
encoderCache[string(v.Kind())] = f
case reflect.Uint16:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(uint16); ok {
return marshalUint16(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected uint16")
}
encoderCache[string(v.Kind())] = f
case reflect.Int32:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(int32); ok {
return marshalInt32(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected int32")
}
encoderCache[string(v.Kind())] = f
case reflect.Uint32:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(uint32); ok {
return marshalUint32(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected uint32")
}
encoderCache[string(v.Kind())] = f
case reflect.Float32:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(float32); ok {
return marshalFloat32(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected float32")
}
encoderCache[string(v.Kind())] = f
case reflect.Int64:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(int64); ok {
return marshalInt64(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected int64")
}
encoderCache[string(v.Kind())] = f
case reflect.Uint64:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(uint64); ok {
return marshalUint64(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected uint64")
}
encoderCache[string(v.Kind())] = f
case reflect.Float64:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(float64); ok {
return marshalFloat64(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected float64")
}
encoderCache[string(v.Kind())] = f
case reflect.String:
f := func(e interface{}) (ret []byte, err error) {
if i, ok := e.(string); ok {
return marshalString(i), nil
}
return nil, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected string")
}
encoderCache[string(v.Kind())] = f
default:
return errors.New("ssob: Unknown type " + string(v.Kind()))
}
return nil
}
func marshal(e interface{}) (ret []byte, err error) {
var key string
t := reflect.TypeOf(e)
v := reflect.ValueOf(e)
if t.Kind() == reflect.Ptr {
if v.IsNil() {
return nil, errors.New("ssob: Cannot marshal nil pointer")
}
p := reflect.Indirect(v)
return marshal(p.Interface())
}
if t.Kind() == reflect.Struct {
key = reflect.TypeOf(e).Name()
} else {
key = string(t.Kind())
}
if f, ok := encoderCache[key]; ok {
return f(e)
} else {
err = encRegister(e)
if err != nil {
return nil, err
}
}
return marshal(e)
}

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package ssob
import (
"encoding/binary"
"errors"
"reflect"
)
func unmarshalString(in []byte) (ret string, n int, err error) {
if len(in) < 8 {
return "", 0, errors.New("ssob: Invalid input to decode string")
}
l := int64(binary.BigEndian.Uint64(in))
if len(in[8:]) < int(l) {
return "", 0, errors.New("ssob: Invalid length of string")
}
return string(in[8 : l+8]), int(l) + 8, nil
}
func unmarshalInt8(in []byte) (ret int8, n int, err error) {
if len(in) < 1 {
return 0, 0, errors.New("ssob: Invalid input to decode int8")
}
return int8(in[0]), 1, nil
}
func unmarshalUint8(in []byte) (ret uint8, n int, err error) {
if len(in) < 1 {
return 0, 0, errors.New("ssob: Invalid input to decode uint8")
}
return uint8(in[0]), 1, nil
}
func unmarshalInt16(in []byte) (ret int16, n int, err error) {
if len(in) < 2 {
return 0, 0, errors.New("ssob: Invalid input to decode int16")
}
return int16(binary.BigEndian.Uint16(in[0:2])), 2, nil
}
func unmarshalUint16(in []byte) (ret uint16, n int, err error) {
if len(in) < 2 {
return 0, 0, errors.New("ssob: Invalid input to decode uint16")
}
return binary.BigEndian.Uint16(in[0:1]), 2, nil
}
func unmarshalInt32(in []byte) (ret int32, n int, err error) {
if len(in) < 4 {
return 0, 0, errors.New("ssob: Invalid input to decode int32")
}
return int32(binary.BigEndian.Uint32(in[0:4])), 4, nil
}
func unmarshalUint32(in []byte) (ret uint32, n int, err error) {
if len(in) < 4 {
return 0, 0, errors.New("ssob: Invalid input to decode uint32")
}
return binary.BigEndian.Uint32(in[0:4]), 4, nil
}
func unmarshalFloat32(in []byte) (ret float32, n int, err error) {
if len(in) < 4 {
return 0, 0, errors.New("ssob: Invalid input to decode float32")
}
return float32(binary.BigEndian.Uint64(in[0:4])), 4, nil
}
func unmarshalInt64(in []byte) (ret int64, n int, err error) {
if len(in) < 8 {
return 0, 0, errors.New("ssob: Invalid input to decode int64")
}
return int64(binary.BigEndian.Uint64(in[0:8])), 8, nil
}
func unmarshalUint64(in []byte) (ret uint64, n int, err error) {
if len(in) < 8 {
return 0, 0, errors.New("ssob: Invalid input to decode uint64")
}
return binary.BigEndian.Uint64(in[0:8]), 8, nil
}
func unmarshalFloat64(in []byte) (ret float64, n int, err error) {
if len(in) < 8 {
return 0, 0, errors.New("ssob: Invalid input to decode float64")
}
return float64(binary.BigEndian.Uint64(in[0:8])), 8, nil
}
type unmarshalFunc func(e interface{}, in []byte) (n int, err error)
var decoderCache map[string]unmarshalFunc
func init() {
decoderCache = make(map[string]unmarshalFunc)
decRegister(int8(0))
decRegister(uint8(0))
decRegister(int16(0))
decRegister(uint16(0))
decRegister(int32(0))
decRegister(uint32(0))
decRegister(float32(0))
decRegister(int64(0))
decRegister(uint64(0))
decRegister(float64(0))
decRegister(string(""))
}
func decRegister(e interface{}) (err error) {
t := reflect.TypeOf(e)
v := reflect.ValueOf(e)
switch t.Kind() {
case reflect.Invalid:
return errors.New("ssob: Invalid type")
case reflect.Slice:
return errors.New("ssob: Unsupported type")
case reflect.Struct:
f := func(e interface{}, in []byte) (n int, err error) {
t := reflect.TypeOf(e)
v := reflect.ValueOf(e)
pos := 0
if t.Kind() != reflect.Ptr || v.IsNil() {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
vi := reflect.Indirect(v)
l := vi.NumField()
for i := 0; i < l; i++ {
ni, err := unmarshal(vi.Field(i).Addr().Interface(), in[pos:])
pos += ni
if err != nil {
return pos, err
}
}
return pos, nil
}
decoderCache[t.Name()] = f
case reflect.Int8:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*int8); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalInt8(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *int8")
}
decoderCache[string(v.Kind())] = f
case reflect.Uint8:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*uint8); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalUint8(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *uint8")
}
decoderCache[string(v.Kind())] = f
case reflect.Int16:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*int16); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalInt16(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *int16")
}
decoderCache[string(v.Kind())] = f
case reflect.Uint16:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*uint16); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalUint16(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *uint16")
}
decoderCache[string(v.Kind())] = f
case reflect.Int32:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*int32); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalInt32(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *int32")
}
decoderCache[string(v.Kind())] = f
case reflect.Uint32:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*uint32); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalUint32(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *uint32")
}
decoderCache[string(v.Kind())] = f
case reflect.Float32:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*float32); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalFloat32(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *float32")
}
decoderCache[string(v.Kind())] = f
case reflect.Int64:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*int64); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalInt64(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *int64")
}
decoderCache[string(v.Kind())] = f
case reflect.Uint64:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*uint64); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalUint64(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *uint64")
}
decoderCache[string(v.Kind())] = f
case reflect.Float64:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*float64); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalFloat64(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *float64")
}
decoderCache[string(v.Kind())] = f
case reflect.String:
f := func(e interface{}, in []byte) (n int, err error) {
if i, ok := e.(*string); ok {
if i == nil {
return 0, errors.New("ssob: Cannot unmarshal to nil pointer")
}
*i, n, err = unmarshalString(in)
if err != nil {
return 0, err
}
return n, err
}
return 0, errors.New("ssob: Incompatible type " + string(v.Kind()) + " - expected *string")
}
decoderCache[string(v.Kind())] = f
default:
return errors.New("ssob: Unknown type " + string(v.Kind()))
}
return nil
}
func unmarshal(e interface{}, in []byte) (n int, err error) {
var key string
t := reflect.TypeOf(e)
v := reflect.ValueOf(e)
if t.Kind() != reflect.Ptr || v.IsNil() {
return 0, errors.New("ssob: Need a pointer that is fully allocated for unmarshalling")
}
p := reflect.Indirect(v)
if p.Kind() != reflect.Ptr {
if p.Kind() == reflect.Struct {
key = reflect.TypeOf(p.Interface()).Name()
} else {
key = string(p.Kind())
}
if f, ok := decoderCache[key]; ok {
return f(v.Interface(), in)
} else {
err = decRegister(p.Interface())
if err != nil {
return 0, err
}
}
}
return unmarshal(e, in)
}