| David K. Bainbridge | bd6b288 | 2021-08-26 13:31:02 +0000 | [diff] [blame] | 1 | // Copyright 2019 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package proto |
| 6 | |
| 7 | import ( |
| 8 | "google.golang.org/protobuf/encoding/protowire" |
| 9 | "google.golang.org/protobuf/internal/encoding/messageset" |
| 10 | "google.golang.org/protobuf/internal/errors" |
| 11 | "google.golang.org/protobuf/internal/flags" |
| 12 | "google.golang.org/protobuf/internal/order" |
| 13 | "google.golang.org/protobuf/reflect/protoreflect" |
| 14 | "google.golang.org/protobuf/reflect/protoregistry" |
| 15 | ) |
| 16 | |
| 17 | func (o MarshalOptions) sizeMessageSet(m protoreflect.Message) (size int) { |
| 18 | m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool { |
| 19 | size += messageset.SizeField(fd.Number()) |
| 20 | size += protowire.SizeTag(messageset.FieldMessage) |
| 21 | size += protowire.SizeBytes(o.size(v.Message())) |
| 22 | return true |
| 23 | }) |
| 24 | size += messageset.SizeUnknown(m.GetUnknown()) |
| 25 | return size |
| 26 | } |
| 27 | |
| 28 | func (o MarshalOptions) marshalMessageSet(b []byte, m protoreflect.Message) ([]byte, error) { |
| 29 | if !flags.ProtoLegacy { |
| 30 | return b, errors.New("no support for message_set_wire_format") |
| 31 | } |
| 32 | fieldOrder := order.AnyFieldOrder |
| 33 | if o.Deterministic { |
| 34 | fieldOrder = order.NumberFieldOrder |
| 35 | } |
| 36 | var err error |
| 37 | order.RangeFields(m, fieldOrder, func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool { |
| 38 | b, err = o.marshalMessageSetField(b, fd, v) |
| 39 | return err == nil |
| 40 | }) |
| 41 | if err != nil { |
| 42 | return b, err |
| 43 | } |
| 44 | return messageset.AppendUnknown(b, m.GetUnknown()) |
| 45 | } |
| 46 | |
| 47 | func (o MarshalOptions) marshalMessageSetField(b []byte, fd protoreflect.FieldDescriptor, value protoreflect.Value) ([]byte, error) { |
| 48 | b = messageset.AppendFieldStart(b, fd.Number()) |
| 49 | b = protowire.AppendTag(b, messageset.FieldMessage, protowire.BytesType) |
| 50 | b = protowire.AppendVarint(b, uint64(o.Size(value.Message().Interface()))) |
| 51 | b, err := o.marshalMessage(b, value.Message()) |
| 52 | if err != nil { |
| 53 | return b, err |
| 54 | } |
| 55 | b = messageset.AppendFieldEnd(b) |
| 56 | return b, nil |
| 57 | } |
| 58 | |
| 59 | func (o UnmarshalOptions) unmarshalMessageSet(b []byte, m protoreflect.Message) error { |
| 60 | if !flags.ProtoLegacy { |
| 61 | return errors.New("no support for message_set_wire_format") |
| 62 | } |
| 63 | return messageset.Unmarshal(b, false, func(num protowire.Number, v []byte) error { |
| 64 | err := o.unmarshalMessageSetField(m, num, v) |
| 65 | if err == errUnknown { |
| 66 | unknown := m.GetUnknown() |
| 67 | unknown = protowire.AppendTag(unknown, num, protowire.BytesType) |
| 68 | unknown = protowire.AppendBytes(unknown, v) |
| 69 | m.SetUnknown(unknown) |
| 70 | return nil |
| 71 | } |
| 72 | return err |
| 73 | }) |
| 74 | } |
| 75 | |
| 76 | func (o UnmarshalOptions) unmarshalMessageSetField(m protoreflect.Message, num protowire.Number, v []byte) error { |
| 77 | md := m.Descriptor() |
| 78 | if !md.ExtensionRanges().Has(num) { |
| 79 | return errUnknown |
| 80 | } |
| 81 | xt, err := o.Resolver.FindExtensionByNumber(md.FullName(), num) |
| 82 | if err == protoregistry.NotFound { |
| 83 | return errUnknown |
| 84 | } |
| 85 | if err != nil { |
| 86 | return errors.New("%v: unable to resolve extension %v: %v", md.FullName(), num, err) |
| 87 | } |
| 88 | xd := xt.TypeDescriptor() |
| 89 | if err := o.unmarshalMessage(v, m.Mutable(xd).Message()); err != nil { |
| 90 | return err |
| 91 | } |
| 92 | return nil |
| 93 | } |