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package msgpack
import (
"errors"
"fmt"
"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 mustSet(v reflect.Value) error {
if !v.CanSet() {
return fmt.Errorf("msgpack: Decode(nonsettable %s)", v.Type())
}
return nil
}
func getDecoder(typ reflect.Type) decoderFunc {
kind := typ.Kind()
decoder, ok := typDecMap[typ]
if ok {
return decoder
}
if typ.Implements(customDecoderType) {
return decodeCustomValue
}
if typ.Implements(unmarshalerType) {
return unmarshalValue
}
// Addressable struct field value.
if kind != reflect.Ptr {
ptr := reflect.PtrTo(typ)
if ptr.Implements(customDecoderType) {
return decodeCustomValueAddr
}
if ptr.Implements(unmarshalerType) {
return unmarshalValueAddr
}
}
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() {
if err := mustSet(v); err != nil {
return err
}
if !v.IsNil() {
v.Set(reflect.Zero(v.Type()))
}
return d.DecodeNil()
}
if v.IsNil() {
if err := mustSet(v); err != nil {
return err
}
v.Set(reflect.New(v.Type().Elem()))
}
return decoder(d, v.Elem())
}
}
func decodeCustomValueAddr(d *Decoder, v reflect.Value) error {
if !v.CanAddr() {
return fmt.Errorf("msgpack: Decode(nonaddressable %T)", v.Interface())
}
return decodeCustomValue(d, v.Addr())
}
func decodeCustomValue(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
return d.decodeNilValue(v)
}
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
decoder := v.Interface().(CustomDecoder)
return decoder.DecodeMsgpack(d)
}
func unmarshalValueAddr(d *Decoder, v reflect.Value) error {
if !v.CanAddr() {
return fmt.Errorf("msgpack: Decode(nonaddressable %T)", v.Interface())
}
return unmarshalValue(d, v.Addr())
}
func unmarshalValue(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
return d.decodeNilValue(v)
}
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
if d.extLen != 0 {
b, err := d.readN(d.extLen)
if err != nil {
return err
}
d.rec = b
} else {
d.rec = makeBuffer()
if err := d.Skip(); err != nil {
return err
}
}
unmarshaler := v.Interface().(Unmarshaler)
err := unmarshaler.UnmarshalMsgpack(d.rec)
d.rec = nil
return err
}
func decodeBoolValue(d *Decoder, v reflect.Value) error {
flag, err := d.DecodeBool()
if err != nil {
return err
}
if err = mustSet(v); err != nil {
return err
}
v.SetBool(flag)
return nil
}
func decodeInterfaceValue(d *Decoder, v reflect.Value) error {
if v.IsNil() {
return d.interfaceValue(v)
}
elem := v.Elem()
if !elem.CanAddr() {
if d.hasNilCode() {
v.Set(reflect.Zero(v.Type()))
return d.DecodeNil()
}
}
return d.DecodeValue(elem)
}
func (d *Decoder) interfaceValue(v reflect.Value) error {
vv, err := d.decodeInterfaceCond()
if err != nil {
return err
}
if vv != nil {
if v.Type() == errorType {
if vv, ok := vv.(string); ok {
v.Set(reflect.ValueOf(errors.New(vv)))
return nil
}
}
v.Set(reflect.ValueOf(vv))
}
return nil
}
func decodeUnsupportedValue(d *Decoder, v reflect.Value) error {
return fmt.Errorf("msgpack: Decode(unsupported %s)", v.Type())
}
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