func (enc *Encoder) marshalFieldValue(s capnp.Struct, f schema.Field) error {
typ, err := f.Slot().Type()
if err != nil {
return err
}
dv, err := f.Slot().DefaultValue()
if err != nil {
return err
}
if dv.IsValid() && int(typ.Which()) != int(dv.Which()) {
name, _ := f.Name()
return fmt.Errorf("marshal field %s: default value is a %v, want %v", name, dv.Which(), typ.Which())
}
switch typ.Which() {
case schema.Type_Which_void:
enc.w.WriteString(voidMarker)
case schema.Type_Which_bool:
v := s.Bit(capnp.BitOffset(f.Slot().Offset()))
d := dv.Bool()
enc.marshalBool(!d && v || d && !v)
case schema.Type_Which_int8:
v := s.Uint8(capnp.DataOffset(f.Slot().Offset()))
d := uint8(dv.Int8())
enc.marshalInt(int64(int8(v ^ d)))
case schema.Type_Which_int16:
v := s.Uint16(capnp.DataOffset(f.Slot().Offset() * 2))
d := uint16(dv.Int16())
enc.marshalInt(int64(int16(v ^ d)))
case schema.Type_Which_int32:
v := s.Uint32(capnp.DataOffset(f.Slot().Offset() * 4))
d := uint32(dv.Int32())
enc.marshalInt(int64(int32(v ^ d)))
case schema.Type_Which_int64:
v := s.Uint64(capnp.DataOffset(f.Slot().Offset() * 8))
d := uint64(dv.Int64())
enc.marshalInt(int64(v ^ d))
case schema.Type_Which_uint8:
v := s.Uint8(capnp.DataOffset(f.Slot().Offset()))
d := dv.Uint8()
enc.marshalUint(uint64(v ^ d))
case schema.Type_Which_uint16:
v := s.Uint16(capnp.DataOffset(f.Slot().Offset() * 2))
d := dv.Uint16()
enc.marshalUint(uint64(v ^ d))
case schema.Type_Which_uint32:
v := s.Uint32(capnp.DataOffset(f.Slot().Offset() * 4))
d := dv.Uint32()
enc.marshalUint(uint64(v ^ d))
case schema.Type_Which_uint64:
v := s.Uint64(capnp.DataOffset(f.Slot().Offset() * 8))
d := dv.Uint64()
enc.marshalUint(v ^ d)
case schema.Type_Which_float32:
v := s.Uint32(capnp.DataOffset(f.Slot().Offset() * 4))
d := math.Float32bits(dv.Float32())
enc.marshalFloat32(math.Float32frombits(v ^ d))
case schema.Type_Which_float64:
v := s.Uint64(capnp.DataOffset(f.Slot().Offset() * 8))
d := math.Float64bits(dv.Float64())
enc.marshalFloat64(math.Float64frombits(v ^ d))
case schema.Type_Which_structType:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
if !p.IsValid() {
p, _ = dv.StructValuePtr()
}
return enc.marshalStruct(typ.StructType().TypeId(), p.Struct())
case schema.Type_Which_data:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
if !p.IsValid() {
b, _ := dv.Data()
enc.marshalText(b)
return nil
}
enc.marshalText(p.Data())
case schema.Type_Which_text:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
if !p.IsValid() {
b, _ := dv.TextBytes()
enc.marshalText(b)
return nil
}
enc.marshalText(p.TextBytes())
case schema.Type_Which_list:
elem, err := typ.List().ElementType()
if err != nil {
return err
}
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
if !p.IsValid() {
p, _ = dv.ListPtr()
}
return enc.marshalList(elem, p.List())
case schema.Type_Which_enum:
v := s.Uint16(capnp.DataOffset(f.Slot().Offset() * 2))
d := dv.Uint16()
return enc.marshalEnum(typ.Enum().TypeId(), v^d)
case schema.Type_Which_interface:
enc.w.WriteString(interfaceMarker)
case schema.Type_Which_anyPointer:
enc.w.WriteString(anyPointerMarker)
default:
return fmt.Errorf("unknown field type %v", typ.Which())
}
return nil
}
