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decode_value.go
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decode_value.go
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package msgpack
import (
"fmt"
"io/ioutil"
"reflect"
)
var interfaceType = reflect.TypeOf((*interface{})(nil)).Elem()
var stringType = reflect.TypeOf((*string)(nil)).Elem()
var valueDecoders []decoderFunc
func init() {
valueDecoders = []decoderFunc{
reflect.Bool: decodeBoolValue,
reflect.Int: decodeInt64Value,
reflect.Int8: decodeInt64Value,
reflect.Int16: decodeInt64Value,
reflect.Int32: decodeInt64Value,
reflect.Int64: decodeInt64Value,
reflect.Uint: decodeUint64Value,
reflect.Uint8: decodeUint64Value,
reflect.Uint16: decodeUint64Value,
reflect.Uint32: decodeUint64Value,
reflect.Uint64: decodeUint64Value,
reflect.Float32: decodeFloat32Value,
reflect.Float64: decodeFloat64Value,
reflect.Complex64: decodeUnsupportedValue,
reflect.Complex128: decodeUnsupportedValue,
reflect.Array: decodeArrayValue,
reflect.Chan: decodeUnsupportedValue,
reflect.Func: decodeUnsupportedValue,
reflect.Interface: decodeInterfaceValue,
reflect.Map: decodeMapValue,
reflect.Ptr: decodeUnsupportedValue,
reflect.Slice: decodeSliceValue,
reflect.String: decodeStringValue,
reflect.Struct: decodeStructValue,
reflect.UnsafePointer: decodeUnsupportedValue,
}
}
func getDecoder(typ reflect.Type) decoderFunc {
kind := typ.Kind()
if typ.Implements(customDecoderType) {
return decodeCustomValue
}
// Addressable struct field value.
if kind != reflect.Ptr && reflect.PtrTo(typ).Implements(customDecoderType) {
return decodeCustomValuePtr
}
if typ.Implements(unmarshalerType) {
return unmarshalValue
}
if decoder, ok := typDecMap[typ]; ok {
return decoder
}
switch kind {
case reflect.Ptr:
return ptrDecoderFunc(typ)
case reflect.Slice:
elem := typ.Elem()
switch elem.Kind() {
case reflect.Uint8:
return decodeBytesValue
}
switch elem {
case stringType:
return decodeStringSliceValue
}
case reflect.Array:
if typ.Elem().Kind() == reflect.Uint8 {
return decodeByteArrayValue
}
case reflect.Map:
if typ.Key() == stringType {
switch typ.Elem() {
case stringType:
return decodeMapStringStringValue
case interfaceType:
return decodeMapStringInterfaceValue
}
}
}
return valueDecoders[kind]
}
func ptrDecoderFunc(typ reflect.Type) decoderFunc {
decoder := getDecoder(typ.Elem())
return func(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
v.Set(reflect.Zero(v.Type()))
return d.DecodeNil()
}
if v.IsNil() {
if !v.CanSet() {
return fmt.Errorf("msgpack: Decode(nonsettable %T)", v.Interface())
}
v.Set(reflect.New(v.Type().Elem()))
}
return decoder(d, v.Elem())
}
}
func decodeCustomValuePtr(d *Decoder, v reflect.Value) error {
if !v.CanAddr() {
return fmt.Errorf("msgpack: Decode(nonsettable %T)", v.Interface())
}
if d.hasNilCode() {
return d.DecodeNil()
}
decoder := v.Addr().Interface().(CustomDecoder)
return decoder.DecodeMsgpack(d)
}
func decodeCustomValue(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
return d.DecodeNil()
}
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
decoder := v.Interface().(CustomDecoder)
return decoder.DecodeMsgpack(d)
}
func unmarshalValue(d *Decoder, v reflect.Value) error {
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
b, err := ioutil.ReadAll(d.r)
if err != nil {
return err
}
unmarshaler := v.Interface().(Unmarshaler)
return unmarshaler.UnmarshalMsgpack(b)
}
func decodeBoolValue(d *Decoder, v reflect.Value) error {
r, err := d.DecodeBool()
if err != nil {
return err
}
v.SetBool(r)
return nil
}
func decodeInterfaceValue(d *Decoder, v reflect.Value) error {
if v.IsNil() {
return d.interfaceValue(v)
}
return d.DecodeValue(v.Elem())
}
func decodeUnsupportedValue(d *Decoder, v reflect.Value) error {
return fmt.Errorf("msgpack: Decode(unsupported %s)", v.Type())
}