func (e *extracter) extractField(val reflect.Value, 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.NameBytes()
return fmt.Errorf("extract field %s: default value is a %v, want %v", name, dv.Which(), typ.Which())
}
if !isTypeMatch(val.Type(), typ) {
name, _ := f.NameBytes()
return fmt.Errorf("can't extract field %s of type %v into a Go %v", name, typ.Which(), val.Type())
}
switch typ.Which() {
case schema.Type_Which_bool:
v := s.Bit(capnp.BitOffset(f.Slot().Offset()))
d := dv.Bool()
val.SetBool(v != d) // != acts as XOR
case schema.Type_Which_int8:
v := int8(s.Uint8(capnp.DataOffset(f.Slot().Offset())))
d := dv.Int8()
val.SetInt(int64(v ^ d))
case schema.Type_Which_int16:
v := int16(s.Uint16(capnp.DataOffset(f.Slot().Offset() * 2)))
d := dv.Int16()
val.SetInt(int64(v ^ d))
case schema.Type_Which_int32:
v := int32(s.Uint32(capnp.DataOffset(f.Slot().Offset() * 4)))
d := dv.Int32()
val.SetInt(int64(v ^ d))
case schema.Type_Which_int64:
v := int64(s.Uint64(capnp.DataOffset(f.Slot().Offset() * 8)))
d := dv.Int64()
val.SetInt(v ^ d)
case schema.Type_Which_uint8:
v := s.Uint8(capnp.DataOffset(f.Slot().Offset()))
d := dv.Uint8()
val.SetUint(uint64(v ^ d))
case schema.Type_Which_uint16:
v := s.Uint16(capnp.DataOffset(f.Slot().Offset() * 2))
d := dv.Uint16()
val.SetUint(uint64(v ^ d))
case schema.Type_Which_enum:
v := s.Uint16(capnp.DataOffset(f.Slot().Offset() * 2))
d := dv.Enum()
val.SetUint(uint64(v ^ d))
case schema.Type_Which_uint32:
v := s.Uint32(capnp.DataOffset(f.Slot().Offset() * 4))
d := dv.Uint32()
val.SetUint(uint64(v ^ d))
case schema.Type_Which_uint64:
v := s.Uint64(capnp.DataOffset(f.Slot().Offset() * 8))
d := dv.Uint64()
val.SetUint(v ^ d)
case schema.Type_Which_float32:
v := s.Uint32(capnp.DataOffset(f.Slot().Offset() * 4))
d := math.Float32bits(dv.Float32())
val.SetFloat(float64(math.Float32frombits(v ^ d)))
case schema.Type_Which_float64:
v := s.Uint64(capnp.DataOffset(f.Slot().Offset() * 8))
d := math.Float64bits(dv.Float64())
val.SetFloat(math.Float64frombits(v ^ d))
case schema.Type_Which_text:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
var b []byte
if p.IsValid() {
b = p.TextBytes()
} else {
b, _ = dv.TextBytes()
}
if val.Kind() == reflect.String {
val.SetString(string(b))
} else {
// byte slice, as guaranteed by isTypeMatch
val.SetBytes(b)
}
case schema.Type_Which_data:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
var b []byte
if p.IsValid() {
b = p.Data()
} else {
b, _ = dv.Data()
}
val.SetBytes(b)
case schema.Type_Which_structType:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
ss := p.Struct()
if !ss.IsValid() {
p, _ = dv.StructValuePtr()
ss = p.Struct()
}
return e.extractStruct(val, typ.StructType().TypeId(), ss)
case schema.Type_Which_list:
p, err := s.Ptr(uint16(f.Slot().Offset()))
if err != nil {
return err
}
l := p.List()
if !l.IsValid() {
p, _ = dv.ListPtr()
l = p.List()
}
return e.extractList(val, typ, l)
default:
return fmt.Errorf("unknown field type %v", typ.Which())
}
return nil
}
func (ins *inserter) insertField(s capnp.Struct, f schema.Field, val reflect.Value) 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.NameBytes()
return fmt.Errorf("insert field %s: default value is a %v, want %v", name, dv.Which(), typ.Which())
}
if !isTypeMatch(val.Type(), typ) {
name, _ := f.NameBytes()
return fmt.Errorf("can't insert field %s of type Go %v into a %v", name, val.Type(), typ.Which())
}
if !isFieldInBounds(s.Size(), f.Slot().Offset(), typ) {
name, _ := f.NameBytes()
return fmt.Errorf("can't insert field %s: allocated struct is too small", name)
}
switch typ.Which() {
case schema.Type_Which_bool:
v := val.Bool()
d := dv.Bool()
s.SetBit(capnp.BitOffset(f.Slot().Offset()), v != d) // != acts as XOR
case schema.Type_Which_int8:
v := int8(val.Int())
d := dv.Int8()
s.SetUint8(capnp.DataOffset(f.Slot().Offset()), uint8(v^d))
case schema.Type_Which_int16:
v := int16(val.Int())
d := dv.Int16()
s.SetUint16(capnp.DataOffset(f.Slot().Offset()*2), uint16(v^d))
case schema.Type_Which_int32:
v := int32(val.Int())
d := dv.Int32()
s.SetUint32(capnp.DataOffset(f.Slot().Offset()*4), uint32(v^d))
case schema.Type_Which_int64:
v := val.Int()
d := dv.Int64()
s.SetUint64(capnp.DataOffset(f.Slot().Offset()*8), uint64(v^d))
case schema.Type_Which_uint8:
v := uint8(val.Uint())
d := dv.Uint8()
s.SetUint8(capnp.DataOffset(f.Slot().Offset()), v^d)
case schema.Type_Which_uint16:
v := uint16(val.Uint())
d := dv.Uint16()
s.SetUint16(capnp.DataOffset(f.Slot().Offset()*2), v^d)
case schema.Type_Which_enum:
v := uint16(val.Uint())
d := dv.Enum()
s.SetUint16(capnp.DataOffset(f.Slot().Offset()*2), v^d)
case schema.Type_Which_uint32:
v := uint32(val.Uint())
d := dv.Uint32()
s.SetUint32(capnp.DataOffset(f.Slot().Offset()*4), v^d)
case schema.Type_Which_uint64:
v := val.Uint()
d := dv.Uint64()
s.SetUint64(capnp.DataOffset(f.Slot().Offset()*8), v^d)
case schema.Type_Which_float32:
v := math.Float32bits(float32(val.Float()))
d := math.Float32bits(dv.Float32())
s.SetUint32(capnp.DataOffset(f.Slot().Offset()*4), v^d)
case schema.Type_Which_float64:
v := math.Float64bits(val.Float())
d := uint64(math.Float64bits(dv.Float64()))
s.SetUint64(capnp.DataOffset(f.Slot().Offset()*8), v^d)
case schema.Type_Which_text:
off := uint16(f.Slot().Offset())
if val.Len() == 0 {
if !isEmptyValue(dv) {
return s.SetNewText(off, "")
}
return s.SetText(off, "")
}
if val.Kind() == reflect.String {
return s.SetText(off, val.String())
} else {
return s.SetTextFromBytes(off, val.Bytes())
}
case schema.Type_Which_data:
b := val.Bytes()
if b == nil && !isEmptyValue(dv) {
b = []byte{}
}
off := uint16(f.Slot().Offset())
return s.SetData(off, b)
case schema.Type_Which_structType:
off := uint16(f.Slot().Offset())
sval := val
if val.Kind() == reflect.Ptr {
if val.IsNil() {
return s.SetPtr(off, capnp.Ptr{})
}
sval = val.Elem()
}
id := typ.StructType().TypeId()
sz, err := ins.structSize(id)
if err != nil {
return err
}
ss, err := capnp.NewStruct(s.Segment(), sz)
if err != nil {
return err
}
if err := s.SetPtr(off, ss.ToPtr()); err != nil {
return err
}
return ins.insertStruct(id, ss, sval)
case schema.Type_Which_list:
off := uint16(f.Slot().Offset())
if val.IsNil() && isEmptyValue(dv) {
return s.SetPtr(off, capnp.Ptr{})
}
elem, err := typ.List().ElementType()
if err != nil {
return err
}
l, err := ins.newList(s.Segment(), elem, int32(val.Len()))
if err != nil {
return err
}
if err := s.SetPtr(off, l.ToPtr()); err != nil {
return err
}
return ins.insertList(l, typ, val)
default:
return fmt.Errorf("unknown field type %v", typ.Which())
}
return nil
}