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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 protoiface contains types referenced or implemented by messages.
//
// WARNING: This package should only be imported by message implementations.
// The functionality found in this package should be accessed through
// higher-level abstractions provided by the proto package.
package protoiface
import (
"google.golang.org/protobuf/internal/pragma"
"google.golang.org/protobuf/reflect/protoreflect"
)
// Methods is a set of optional fast-path implementations of various operations.
type Methods = struct {
pragma.NoUnkeyedLiterals
// Flags indicate support for optional features.
Flags SupportFlags
// Size returns the size in bytes of the wire-format encoding of a message.
// Marshal must be provided if a custom Size is provided.
Size func(SizeInput) SizeOutput
// Marshal formats a message in the wire-format encoding to the provided buffer.
// Size should be provided if a custom Marshal is provided.
// It must not return an error for a partial message.
Marshal func(MarshalInput) (MarshalOutput, error)
// Unmarshal parses the wire-format encoding and merges the result into a message.
// It must not reset the target message or return an error for a partial message.
Unmarshal func(UnmarshalInput) (UnmarshalOutput, error)
// Merge merges the contents of a source message into a destination message.
Merge func(MergeInput) MergeOutput
// CheckInitialized returns an error if any required fields in the message are not set.
CheckInitialized func(CheckInitializedInput) (CheckInitializedOutput, error)
}
// SupportFlags indicate support for optional features.
type SupportFlags = uint64
const (
// SupportMarshalDeterministic reports whether MarshalOptions.Deterministic is supported.
SupportMarshalDeterministic SupportFlags = 1 << iota
// SupportUnmarshalDiscardUnknown reports whether UnmarshalOptions.DiscardUnknown is supported.
SupportUnmarshalDiscardUnknown
)
// SizeInput is input to the Size method.
type SizeInput = struct {
pragma.NoUnkeyedLiterals
Message protoreflect.Message
Flags MarshalInputFlags
}
// SizeOutput is output from the Size method.
type SizeOutput = struct {
pragma.NoUnkeyedLiterals
Size int
}
// MarshalInput is input to the Marshal method.
type MarshalInput = struct {
pragma.NoUnkeyedLiterals
Message protoreflect.Message
Buf []byte // output is appended to this buffer
Flags MarshalInputFlags
}
// MarshalOutput is output from the Marshal method.
type MarshalOutput = struct {
pragma.NoUnkeyedLiterals
Buf []byte // contains marshaled message
}
// MarshalInputFlags configure the marshaler.
// Most flags correspond to fields in proto.MarshalOptions.
type MarshalInputFlags = uint8
const (
MarshalDeterministic MarshalInputFlags = 1 << iota
MarshalUseCachedSize
)
// UnmarshalInput is input to the Unmarshal method.
type UnmarshalInput = struct {
pragma.NoUnkeyedLiterals
Message protoreflect.Message
Buf []byte // input buffer
Flags UnmarshalInputFlags
Resolver interface {
FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error)
FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error)
}
Depth int
}
// UnmarshalOutput is output from the Unmarshal method.
type UnmarshalOutput = struct {
pragma.NoUnkeyedLiterals
Flags UnmarshalOutputFlags
}
// UnmarshalInputFlags configure the unmarshaler.
// Most flags correspond to fields in proto.UnmarshalOptions.
type UnmarshalInputFlags = uint8
const (
UnmarshalDiscardUnknown UnmarshalInputFlags = 1 << iota
)
// UnmarshalOutputFlags are output from the Unmarshal method.
type UnmarshalOutputFlags = uint8
const (
// UnmarshalInitialized may be set on return if all required fields are known to be set.
// If unset, then it does not necessarily indicate that the message is uninitialized,
// only that its status could not be confirmed.
UnmarshalInitialized UnmarshalOutputFlags = 1 << iota
)
// MergeInput is input to the Merge method.
type MergeInput = struct {
pragma.NoUnkeyedLiterals
Source protoreflect.Message
Destination protoreflect.Message
}
// MergeOutput is output from the Merge method.
type MergeOutput = struct {
pragma.NoUnkeyedLiterals
Flags MergeOutputFlags
}
// MergeOutputFlags are output from the Merge method.
type MergeOutputFlags = uint8
const (
// MergeComplete reports whether the merge was performed.
// If unset, the merger must have made no changes to the destination.
MergeComplete MergeOutputFlags = 1 << iota
)
// CheckInitializedInput is input to the CheckInitialized method.
type CheckInitializedInput = struct {
pragma.NoUnkeyedLiterals
Message protoreflect.Message
}
// CheckInitializedOutput is output from the CheckInitialized method.
type CheckInitializedOutput = struct {
pragma.NoUnkeyedLiterals
}
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