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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/internal/encoding/messageset"
"google.golang.org/protobuf/internal/errors"
"google.golang.org/protobuf/internal/flags"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
)
func sizeMessageSet(m protoreflect.Message) (size int) {
m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
size += messageset.SizeField(fd.Number())
size += protowire.SizeTag(messageset.FieldMessage)
size += protowire.SizeBytes(sizeMessage(v.Message()))
return true
})
size += messageset.SizeUnknown(m.GetUnknown())
return size
}
func marshalMessageSet(b []byte, m protoreflect.Message, o MarshalOptions) ([]byte, error) {
if !flags.ProtoLegacy {
return b, errors.New("no support for message_set_wire_format")
}
var err error
o.rangeFields(m, func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
b, err = marshalMessageSetField(b, fd, v, o)
return err == nil
})
if err != nil {
return b, err
}
return messageset.AppendUnknown(b, m.GetUnknown())
}
func marshalMessageSetField(b []byte, fd protoreflect.FieldDescriptor, value protoreflect.Value, o MarshalOptions) ([]byte, error) {
b = messageset.AppendFieldStart(b, fd.Number())
b = protowire.AppendTag(b, messageset.FieldMessage, protowire.BytesType)
b = protowire.AppendVarint(b, uint64(o.Size(value.Message().Interface())))
b, err := o.marshalMessage(b, value.Message())
if err != nil {
return b, err
}
b = messageset.AppendFieldEnd(b)
return b, nil
}
func unmarshalMessageSet(b []byte, m protoreflect.Message, o UnmarshalOptions) error {
if !flags.ProtoLegacy {
return errors.New("no support for message_set_wire_format")
}
return messageset.Unmarshal(b, false, func(num protowire.Number, v []byte) error {
err := unmarshalMessageSetField(m, num, v, o)
if err == errUnknown {
unknown := m.GetUnknown()
unknown = protowire.AppendTag(unknown, num, protowire.BytesType)
unknown = protowire.AppendBytes(unknown, v)
m.SetUnknown(unknown)
return nil
}
return err
})
}
func unmarshalMessageSetField(m protoreflect.Message, num protowire.Number, v []byte, o UnmarshalOptions) error {
md := m.Descriptor()
if !md.ExtensionRanges().Has(num) {
return errUnknown
}
xt, err := o.Resolver.FindExtensionByNumber(md.FullName(), num)
if err == protoregistry.NotFound {
return errUnknown
}
if err != nil {
return errors.New("%v: unable to resolve extension %v: %v", md.FullName(), num, err)
}
xd := xt.TypeDescriptor()
if err := o.unmarshalMessage(v, m.Mutable(xd).Message()); err != nil {
return err
}
return nil
}
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