2019-10-04 12:28:45 +02:00
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package ssob
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import (
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"encoding/binary"
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"errors"
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"reflect"
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)
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2019-10-04 17:58:17 +02:00
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func MarshalString(in string) (ret []byte) {
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2019-10-05 01:42:09 +02:00
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l := int32(len(in))
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b := MarshalInt32(l)
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ret = make([]byte, int(l)+len(b))
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copy(ret, b)
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copy(ret[4:], []byte(in))
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return ret
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2019-10-04 12:28:45 +02:00
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}
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2019-10-05 22:12:53 +02:00
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func MarshalBool(in bool) (ret []byte) {
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if in {
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return []byte{byte(0)}
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}
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return []byte{byte(1)}
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}
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2019-10-04 17:58:17 +02:00
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func MarshalInt8(in int8) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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return []byte{byte(in)}
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}
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2019-10-04 17:58:17 +02:00
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func MarshalUint8(in uint8) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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return []byte{byte(in)}
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}
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2019-10-04 17:58:17 +02:00
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func MarshalInt16(in int16) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 2)
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binary.BigEndian.PutUint16(out, uint16(in))
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalUint16(in uint16) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 2)
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binary.BigEndian.PutUint16(out, in)
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalInt32(in int32) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 4)
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binary.BigEndian.PutUint32(out, uint32(in))
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalUint32(in uint32) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 4)
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binary.BigEndian.PutUint32(out, in)
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalFloat32(in float32) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 4)
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binary.BigEndian.PutUint32(out, uint32(in))
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalInt64(in int64) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 8)
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binary.BigEndian.PutUint64(out, uint64(in))
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalUint64(in uint64) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 8)
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binary.BigEndian.PutUint64(out, in)
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return out
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}
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2019-10-04 17:58:17 +02:00
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func MarshalFloat64(in float64) (ret []byte) {
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2019-10-04 12:28:45 +02:00
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out := make([]byte, 8)
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binary.BigEndian.PutUint64(out, uint64(in))
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return out
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}
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2019-10-04 17:58:17 +02:00
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type MarshalFunc func(e interface{}) (ret []byte, err error)
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2019-10-04 12:28:45 +02:00
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2019-10-04 17:58:17 +02:00
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var encoderCache map[string]MarshalFunc
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2019-10-04 12:28:45 +02:00
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func init() {
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2019-10-04 17:58:17 +02:00
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encoderCache = make(map[string]MarshalFunc)
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2019-10-05 22:12:53 +02:00
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RegisterEncoder("bool", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(bool); ok {
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return MarshalBool(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected bool")
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})
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2019-10-05 01:42:09 +02:00
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RegisterEncoder("int8", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int8); ok {
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return MarshalInt8(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected int8")
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})
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RegisterEncoder("uint8", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint8); ok {
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return MarshalUint8(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected uint8")
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})
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RegisterEncoder("int16", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int16); ok {
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return MarshalInt16(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected int16")
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})
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RegisterEncoder("uint16", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint16); ok {
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return MarshalUint16(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected uint16")
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})
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RegisterEncoder("int32", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int32); ok {
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return MarshalInt32(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected int32")
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})
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RegisterEncoder("uint32", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint32); ok {
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return MarshalUint32(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected uint32")
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})
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RegisterEncoder("float32", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(float32); ok {
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return MarshalFloat32(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected float32")
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})
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RegisterEncoder("int64", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int64); ok {
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return MarshalInt64(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected int64")
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})
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RegisterEncoder("uint64", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint64); ok {
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return MarshalUint64(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected uint64")
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})
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RegisterEncoder("float64", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(float64); ok {
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return MarshalFloat64(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected float64")
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})
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RegisterEncoder("string", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(string); ok {
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return MarshalString(i), nil
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}
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return nil, errors.New("ssob: Incompatible type - expected string")
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})
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2019-10-04 12:28:45 +02:00
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}
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func encRegister(e interface{}) (err error) {
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v := reflect.ValueOf(e)
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t := reflect.TypeOf(e)
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switch t.Kind() {
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case reflect.Invalid:
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return errors.New("ssob: Invalid type")
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2019-10-05 22:12:53 +02:00
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case reflect.Array:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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l := v.Len()
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slen := MarshalInt32(int32(l))
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blen := 4
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bs := make([][]byte, l)
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for i := 0; i < l; i++ {
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bs[i], err = marshal(v.Index(i).Interface())
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if err != nil {
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return nil, err
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}
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blen += len(bs[i])
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}
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ret = make([]byte, blen)
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i := copy(ret, slen)
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for c := 0; c < l; c++ {
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i += copy(ret[i:], bs[c])
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}
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return ret, nil
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}
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encoderCache[string(t.Kind())] = f
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2019-10-04 12:28:45 +02:00
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case reflect.Slice:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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l := v.Len()
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2019-10-05 01:42:09 +02:00
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slen := MarshalInt32(int32(l))
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blen := 4
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bs := make([][]byte, l)
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2019-10-04 12:28:45 +02:00
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for i := 0; i < l; i++ {
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2019-10-05 01:42:09 +02:00
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bs[i], err = marshal(v.Index(i).Interface())
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2019-10-04 12:28:45 +02:00
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if err != nil {
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return nil, err
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}
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2019-10-05 01:42:09 +02:00
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blen += len(bs[i])
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}
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ret = make([]byte, blen)
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i := copy(ret, slen)
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for c := 0; c < l; c++ {
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i += copy(ret[i:], bs[c])
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2019-10-04 12:28:45 +02:00
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}
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return ret, nil
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}
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encoderCache[string(t.Kind())] = f
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2019-10-05 01:42:09 +02:00
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case reflect.Map:
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2019-10-04 12:28:45 +02:00
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f := func(e interface{}) (ret []byte, err error) {
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2019-10-05 01:42:09 +02:00
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v := reflect.ValueOf(e)
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l := v.Len()
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ret = MarshalInt32(int32(l))
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for _, ek := range v.MapKeys() {
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ee := v.MapIndex(ek)
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b, err := marshal(ek.Interface())
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if err != nil {
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return nil, err
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}
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ret = append(ret, b...)
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b, err = marshal(ee.Interface())
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2019-10-04 12:28:45 +02:00
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if err != nil {
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return nil, err
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}
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ret = append(ret, b...)
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}
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return ret, nil
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}
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2019-10-05 01:42:09 +02:00
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encoderCache[string(t.Kind())] = f
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case reflect.Struct:
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2019-10-04 12:28:45 +02:00
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f := func(e interface{}) (ret []byte, err error) {
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2019-10-05 01:42:09 +02:00
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n := v.NumField()
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bs := make([][]byte, n)
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blen := 0
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for i := 0; i < n; i++ {
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bs[i], err = marshal(v.Field(i).Interface())
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if err != nil {
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return nil, err
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}
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blen += len(bs[i])
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2019-10-04 12:28:45 +02:00
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}
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2019-10-05 01:42:09 +02:00
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ret = make([]byte, blen)
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i := 0
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for c := 0; c < n; c++ {
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i += copy(ret[i:], bs[c])
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2019-10-04 12:28:45 +02:00
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}
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2019-10-05 01:42:09 +02:00
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return ret, nil
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2019-10-04 12:28:45 +02:00
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}
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2019-10-05 01:42:09 +02:00
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encoderCache[t.Name()] = f
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2019-10-04 12:28:45 +02:00
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default:
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return errors.New("ssob: Unknown type " + string(v.Kind()))
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}
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return nil
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}
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2019-10-05 01:42:09 +02:00
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func marshalBaseType(e interface{}) (ret []byte, err error) {
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switch t := e.(type) {
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2019-10-05 22:12:53 +02:00
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case bool:
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return encoderCache["bool"](t)
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2019-10-05 01:42:09 +02:00
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case int8:
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return encoderCache["int8"](t)
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case uint8:
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return encoderCache["uint8"](t)
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case int16:
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return encoderCache["int16"](t)
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case uint16:
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return encoderCache["uint16"](t)
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case int32:
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return encoderCache["int32"](t)
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case uint32:
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return encoderCache["uint32"](t)
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case int64:
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return encoderCache["int64"](t)
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case uint64:
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return encoderCache["uint64"](t)
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case float32:
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return encoderCache["float32"](t)
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case float64:
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return encoderCache["float64"](t)
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case string:
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return encoderCache["string"](t)
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default:
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return nil, errors.New("ssob: No base type")
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}
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}
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2019-10-04 12:28:45 +02:00
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func marshal(e interface{}) (ret []byte, err error) {
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2019-10-05 01:42:09 +02:00
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ret, err = marshalBaseType(e)
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if err == nil {
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return ret, err
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}
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2019-10-04 12:28:45 +02:00
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var key string
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t := reflect.TypeOf(e)
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v := reflect.ValueOf(e)
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if t.Kind() == reflect.Ptr {
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if v.IsNil() {
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return nil, errors.New("ssob: Cannot marshal nil pointer")
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}
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p := reflect.Indirect(v)
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return marshal(p.Interface())
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}
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if t.Kind() == reflect.Struct {
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key = reflect.TypeOf(e).Name()
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} else {
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key = string(t.Kind())
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}
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if f, ok := encoderCache[key]; ok {
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return f(e)
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} else {
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err = encRegister(e)
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if err != nil {
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return nil, err
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}
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}
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return marshal(e)
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}
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2019-10-04 17:58:17 +02:00
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func RegisterEncoder(name string, f MarshalFunc) {
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encoderCache[name] = f
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}
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