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values.go
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values.go
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package encoder
import (
"errors"
"fmt"
"reflect"
"strings"
)
type TinyInteger uint8
type SmallInteger uint16
type Integer uint32
type BigInteger uint64
type TinySignedInteger int8
type SmallSignedInteger int16
type SignedInteger int32
type BigSignedInteger int64
type String string
type Boolean uint8
const True = Boolean(0xff)
const False = Boolean(0x00)
func encodeValue(value FieldValue, repeated bool) ([]byte, error) {
if value.Value == nil {
return []byte{}, nil
}
if repeated {
var values []byte
for i := 0; i < reflect.ValueOf(value.Value).Len(); i++ {
encodedSingleValue, err := encodeValue(FieldValue{
Value: reflect.ValueOf(value.Value).Index(i).Interface(),
}, false)
if err != nil {
return nil, err
}
values = *addLengthMarker(len(encodedSingleValue), false, &values)
values = append(values, encodedSingleValue...)
}
return values, nil
}
switch v := value.Value.(type) {
case TinyInteger:
return []byte{byte(v)}, nil
case SmallInteger:
return u16to8(uint16(v)), nil
case Integer:
return u32to8(uint32(v)), nil
case BigInteger:
return u64to8(uint64(v)), nil
case TinySignedInteger:
return []byte{byte(v)}, nil
case SmallSignedInteger:
return u16to8(uint16(v)), nil
case SignedInteger:
return u32to8(uint32(v)), nil
case BigSignedInteger:
return u64to8(uint64(v)), nil
case String:
return []byte(v), nil
case Boolean:
return []byte{byte(v)}, nil
}
if v, ok := value.Value.(UserFacingHermodUnit); ok {
encodedUnit, err := UserEncode(v)
if err != nil {
return nil, err
}
return *encodedUnit, nil
}
return nil, fmt.Errorf("type not supported for value %s", value.Value)
}
func decodeValue(field *Field, rawValue []byte) (interface{}, error) {
if field.Repeated {
if len(rawValue) == 0 {
return []interface{}{}, nil
}
index := 0
var items []interface{}
for {
length := int(SliceToU32(rawValue[index : index+4]))
index += 4
rawItem := rawValue[index:(index + length)]
index += length
searchField := *field
searchField.Repeated = false
searchField.Type = reflect.New(field.Type.Type().Elem()).Elem()
decodedItem, err := decodeValue(&searchField, rawItem)
if err != nil {
return nil, err
}
items = append(items, decodedItem)
if index == len(rawValue) {
break
}
}
return items, nil
}
finalTypeName := strings.Split(field.Type.Type().String(), ".")[1]
finalTypeName = strings.ReplaceAll(finalTypeName, "[]", "")
switch finalTypeName {
case "TinyInteger":
return TinyInteger(rawValue[0]), nil
case "SmallInteger":
return SmallInteger(SliceToU16(rawValue)), nil
case "Integer":
return Integer(SliceToU32(rawValue)), nil
case "BigInteger":
return BigInteger(SliceToU64(rawValue)), nil
case "TinySignedInteger":
return TinySignedInteger(rawValue[0]), nil
case "SmallSignedInteger":
return SmallSignedInteger(SliceToU16(rawValue)), nil
case "SignedInteger":
return SignedInteger(SliceToU32(rawValue)), nil
case "BigSignedInteger":
return BigSignedInteger(SliceToU64(rawValue)), nil
case "String":
return String(rawValue), nil
case "Boolean":
return Boolean(rawValue[0]), nil
}
decodeMethod := field.Type.MethodByName("DecodeAbstract")
if decodeMethod.Kind() == reflect.Func && !decodeMethod.IsZero() {
newStruct := reflect.New(field.Type.Type())
outArguments := newStruct.MethodByName("DecodeAbstract").Call([]reflect.Value{reflect.ValueOf(&rawValue)})
data, err := outArguments[0], outArguments[1]
if !err.IsNil() {
return nil, err.Interface().(error)
}
return data.Interface(), nil
}
return nil, errors.New(fmt.Sprintf("unmatchable type for field %s", field.Name))
}