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// Copyright 2024 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 impl
import (
"bytes"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/runtime/protoiface"
)
func equal(in protoiface.EqualInput) protoiface.EqualOutput {
return protoiface.EqualOutput{Equal: equalMessage(in.MessageA, in.MessageB)}
}
// equalMessage is a fast-path variant of protoreflect.equalMessage.
// It takes advantage of the internal messageState type to avoid
// unnecessary allocations, type assertions.
func equalMessage(mx, my protoreflect.Message) bool {
if mx == nil || my == nil {
return mx == my
}
if mx.Descriptor() != my.Descriptor() {
return false
}
msx, ok := mx.(*messageState)
if !ok {
return protoreflect.ValueOfMessage(mx).Equal(protoreflect.ValueOfMessage(my))
}
msy, ok := my.(*messageState)
if !ok {
return protoreflect.ValueOfMessage(mx).Equal(protoreflect.ValueOfMessage(my))
}
mi := msx.messageInfo()
miy := msy.messageInfo()
if mi != miy {
return protoreflect.ValueOfMessage(mx).Equal(protoreflect.ValueOfMessage(my))
}
mi.init()
// Compares regular fields
// Modified Message.Range code that compares two messages of the same type
// while going over the fields.
for _, ri := range mi.rangeInfos {
var fd protoreflect.FieldDescriptor
var vx, vy protoreflect.Value
switch ri := ri.(type) {
case *fieldInfo:
hx := ri.has(msx.pointer())
hy := ri.has(msy.pointer())
if hx != hy {
return false
}
if !hx {
continue
}
fd = ri.fieldDesc
vx = ri.get(msx.pointer())
vy = ri.get(msy.pointer())
case *oneofInfo:
fnx := ri.which(msx.pointer())
fny := ri.which(msy.pointer())
if fnx != fny {
return false
}
if fnx <= 0 {
continue
}
fi := mi.fields[fnx]
fd = fi.fieldDesc
vx = fi.get(msx.pointer())
vy = fi.get(msy.pointer())
}
if !equalValue(fd, vx, vy) {
return false
}
}
// Compare extensions.
// This is more complicated because mx or my could have empty/nil extension maps,
// however some populated extension map values are equal to nil extension maps.
emx := mi.extensionMap(msx.pointer())
emy := mi.extensionMap(msy.pointer())
if emx != nil {
for k, x := range *emx {
xd := x.Type().TypeDescriptor()
xv := x.Value()
var y ExtensionField
ok := false
if emy != nil {
y, ok = (*emy)[k]
}
// We need to treat empty lists as equal to nil values
if emy == nil || !ok {
if xd.IsList() && xv.List().Len() == 0 {
continue
}
return false
}
if !equalValue(xd, xv, y.Value()) {
return false
}
}
}
if emy != nil {
// emy may have extensions emx does not have, need to check them as well
for k, y := range *emy {
if emx != nil {
// emx has the field, so we already checked it
if _, ok := (*emx)[k]; ok {
continue
}
}
// Empty lists are equal to nil
if y.Type().TypeDescriptor().IsList() && y.Value().List().Len() == 0 {
continue
}
// Cant be equal if the extension is populated
return false
}
}
return equalUnknown(mx.GetUnknown(), my.GetUnknown())
}
func equalValue(fd protoreflect.FieldDescriptor, vx, vy protoreflect.Value) bool {
// slow path
if fd.Kind() != protoreflect.MessageKind {
return vx.Equal(vy)
}
// fast path special cases
if fd.IsMap() {
if fd.MapValue().Kind() == protoreflect.MessageKind {
return equalMessageMap(vx.Map(), vy.Map())
}
return vx.Equal(vy)
}
if fd.IsList() {
return equalMessageList(vx.List(), vy.List())
}
return equalMessage(vx.Message(), vy.Message())
}
// Mostly copied from protoreflect.equalMap.
// This variant only works for messages as map types.
// All other map types should be handled via Value.Equal.
func equalMessageMap(mx, my protoreflect.Map) bool {
if mx.Len() != my.Len() {
return false
}
equal := true
mx.Range(func(k protoreflect.MapKey, vx protoreflect.Value) bool {
if !my.Has(k) {
equal = false
return false
}
vy := my.Get(k)
equal = equalMessage(vx.Message(), vy.Message())
return equal
})
return equal
}
// Mostly copied from protoreflect.equalList.
// The only change is the usage of equalImpl instead of protoreflect.equalValue.
func equalMessageList(lx, ly protoreflect.List) bool {
if lx.Len() != ly.Len() {
return false
}
for i := 0; i < lx.Len(); i++ {
// We only operate on messages here since equalImpl will not call us in any other case.
if !equalMessage(lx.Get(i).Message(), ly.Get(i).Message()) {
return false
}
}
return true
}
// equalUnknown compares unknown fields by direct comparison on the raw bytes
// of each individual field number.
// Copied from protoreflect.equalUnknown.
func equalUnknown(x, y protoreflect.RawFields) bool {
if len(x) != len(y) {
return false
}
if bytes.Equal([]byte(x), []byte(y)) {
return true
}
mx := make(map[protoreflect.FieldNumber]protoreflect.RawFields)
my := make(map[protoreflect.FieldNumber]protoreflect.RawFields)
for len(x) > 0 {
fnum, _, n := protowire.ConsumeField(x)
mx[fnum] = append(mx[fnum], x[:n]...)
x = x[n:]
}
for len(y) > 0 {
fnum, _, n := protowire.ConsumeField(y)
my[fnum] = append(my[fnum], y[:n]...)
y = y[n:]
}
if len(mx) != len(my) {
return false
}
for k, v1 := range mx {
if v2, ok := my[k]; !ok || !bytes.Equal([]byte(v1), []byte(v2)) {
return false
}
}
return true
}
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