blob: 845c67d6e7e52d2e290557bebde51f363d715fed [file] [log] [blame]
khenaidoo106c61a2021-08-11 18:05:46 -04001// 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
5package impl
6
7import (
8 "math"
9 "sort"
10 "sync/atomic"
11
12 "google.golang.org/protobuf/internal/flags"
13 proto "google.golang.org/protobuf/proto"
14 piface "google.golang.org/protobuf/runtime/protoiface"
15)
16
17type marshalOptions struct {
18 flags piface.MarshalInputFlags
19}
20
21func (o marshalOptions) Options() proto.MarshalOptions {
22 return proto.MarshalOptions{
23 AllowPartial: true,
24 Deterministic: o.Deterministic(),
25 UseCachedSize: o.UseCachedSize(),
26 }
27}
28
29func (o marshalOptions) Deterministic() bool { return o.flags&piface.MarshalDeterministic != 0 }
30func (o marshalOptions) UseCachedSize() bool { return o.flags&piface.MarshalUseCachedSize != 0 }
31
32// size is protoreflect.Methods.Size.
33func (mi *MessageInfo) size(in piface.SizeInput) piface.SizeOutput {
34 var p pointer
35 if ms, ok := in.Message.(*messageState); ok {
36 p = ms.pointer()
37 } else {
38 p = in.Message.(*messageReflectWrapper).pointer()
39 }
40 size := mi.sizePointer(p, marshalOptions{
41 flags: in.Flags,
42 })
43 return piface.SizeOutput{Size: size}
44}
45
46func (mi *MessageInfo) sizePointer(p pointer, opts marshalOptions) (size int) {
47 mi.init()
48 if p.IsNil() {
49 return 0
50 }
51 if opts.UseCachedSize() && mi.sizecacheOffset.IsValid() {
52 if size := atomic.LoadInt32(p.Apply(mi.sizecacheOffset).Int32()); size >= 0 {
53 return int(size)
54 }
55 }
56 return mi.sizePointerSlow(p, opts)
57}
58
59func (mi *MessageInfo) sizePointerSlow(p pointer, opts marshalOptions) (size int) {
60 if flags.ProtoLegacy && mi.isMessageSet {
61 size = sizeMessageSet(mi, p, opts)
62 if mi.sizecacheOffset.IsValid() {
63 atomic.StoreInt32(p.Apply(mi.sizecacheOffset).Int32(), int32(size))
64 }
65 return size
66 }
67 if mi.extensionOffset.IsValid() {
68 e := p.Apply(mi.extensionOffset).Extensions()
69 size += mi.sizeExtensions(e, opts)
70 }
71 for _, f := range mi.orderedCoderFields {
72 if f.funcs.size == nil {
73 continue
74 }
75 fptr := p.Apply(f.offset)
76 if f.isPointer && fptr.Elem().IsNil() {
77 continue
78 }
79 size += f.funcs.size(fptr, f, opts)
80 }
81 if mi.unknownOffset.IsValid() {
82 if u := mi.getUnknownBytes(p); u != nil {
83 size += len(*u)
84 }
85 }
86 if mi.sizecacheOffset.IsValid() {
87 if size > math.MaxInt32 {
88 // The size is too large for the int32 sizecache field.
89 // We will need to recompute the size when encoding;
90 // unfortunately expensive, but better than invalid output.
91 atomic.StoreInt32(p.Apply(mi.sizecacheOffset).Int32(), -1)
92 } else {
93 atomic.StoreInt32(p.Apply(mi.sizecacheOffset).Int32(), int32(size))
94 }
95 }
96 return size
97}
98
99// marshal is protoreflect.Methods.Marshal.
100func (mi *MessageInfo) marshal(in piface.MarshalInput) (out piface.MarshalOutput, err error) {
101 var p pointer
102 if ms, ok := in.Message.(*messageState); ok {
103 p = ms.pointer()
104 } else {
105 p = in.Message.(*messageReflectWrapper).pointer()
106 }
107 b, err := mi.marshalAppendPointer(in.Buf, p, marshalOptions{
108 flags: in.Flags,
109 })
110 return piface.MarshalOutput{Buf: b}, err
111}
112
113func (mi *MessageInfo) marshalAppendPointer(b []byte, p pointer, opts marshalOptions) ([]byte, error) {
114 mi.init()
115 if p.IsNil() {
116 return b, nil
117 }
118 if flags.ProtoLegacy && mi.isMessageSet {
119 return marshalMessageSet(mi, b, p, opts)
120 }
121 var err error
122 // The old marshaler encodes extensions at beginning.
123 if mi.extensionOffset.IsValid() {
124 e := p.Apply(mi.extensionOffset).Extensions()
125 // TODO: Special handling for MessageSet?
126 b, err = mi.appendExtensions(b, e, opts)
127 if err != nil {
128 return b, err
129 }
130 }
131 for _, f := range mi.orderedCoderFields {
132 if f.funcs.marshal == nil {
133 continue
134 }
135 fptr := p.Apply(f.offset)
136 if f.isPointer && fptr.Elem().IsNil() {
137 continue
138 }
139 b, err = f.funcs.marshal(b, fptr, f, opts)
140 if err != nil {
141 return b, err
142 }
143 }
144 if mi.unknownOffset.IsValid() && !mi.isMessageSet {
145 if u := mi.getUnknownBytes(p); u != nil {
146 b = append(b, (*u)...)
147 }
148 }
149 return b, nil
150}
151
152func (mi *MessageInfo) sizeExtensions(ext *map[int32]ExtensionField, opts marshalOptions) (n int) {
153 if ext == nil {
154 return 0
155 }
156 for _, x := range *ext {
157 xi := getExtensionFieldInfo(x.Type())
158 if xi.funcs.size == nil {
159 continue
160 }
161 n += xi.funcs.size(x.Value(), xi.tagsize, opts)
162 }
163 return n
164}
165
166func (mi *MessageInfo) appendExtensions(b []byte, ext *map[int32]ExtensionField, opts marshalOptions) ([]byte, error) {
167 if ext == nil {
168 return b, nil
169 }
170
171 switch len(*ext) {
172 case 0:
173 return b, nil
174 case 1:
175 // Fast-path for one extension: Don't bother sorting the keys.
176 var err error
177 for _, x := range *ext {
178 xi := getExtensionFieldInfo(x.Type())
179 b, err = xi.funcs.marshal(b, x.Value(), xi.wiretag, opts)
180 }
181 return b, err
182 default:
183 // Sort the keys to provide a deterministic encoding.
184 // Not sure this is required, but the old code does it.
185 keys := make([]int, 0, len(*ext))
186 for k := range *ext {
187 keys = append(keys, int(k))
188 }
189 sort.Ints(keys)
190 var err error
191 for _, k := range keys {
192 x := (*ext)[int32(k)]
193 xi := getExtensionFieldInfo(x.Type())
194 b, err = xi.funcs.marshal(b, x.Value(), xi.wiretag, opts)
195 if err != nil {
196 return b, err
197 }
198 }
199 return b, nil
200 }
201}