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79 lines
1.9 KiB
79 lines
1.9 KiB
5 years ago
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package proto
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import (
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protoV2 "google.golang.org/protobuf/proto"
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"google.golang.org/protobuf/runtime/protoiface"
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)
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// Size returns the size in bytes of the wire-format encoding of m.
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func Size(m Message) int {
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if m == nil {
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return 0
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}
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mi := MessageV2(m)
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return protoV2.Size(mi)
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}
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// Marshal returns the wire-format encoding of m.
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func Marshal(m Message) ([]byte, error) {
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b, err := marshalAppend(nil, m, false)
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if b == nil {
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b = zeroBytes
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}
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return b, err
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}
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var zeroBytes = make([]byte, 0, 0)
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func marshalAppend(buf []byte, m Message, deterministic bool) ([]byte, error) {
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if m == nil {
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return nil, ErrNil
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}
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mi := MessageV2(m)
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nbuf, err := protoV2.MarshalOptions{
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Deterministic: deterministic,
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AllowPartial: true,
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}.MarshalAppend(buf, mi)
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if err != nil {
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return buf, err
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}
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if len(buf) == len(nbuf) {
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if !mi.ProtoReflect().IsValid() {
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return buf, ErrNil
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}
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}
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return nbuf, checkRequiredNotSet(mi)
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}
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// Unmarshal parses a wire-format message in b and places the decoded results in m.
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//
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// Unmarshal resets m before starting to unmarshal, so any existing data in m is always
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// removed. Use UnmarshalMerge to preserve and append to existing data.
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func Unmarshal(b []byte, m Message) error {
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m.Reset()
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return UnmarshalMerge(b, m)
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}
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// UnmarshalMerge parses a wire-format message in b and places the decoded results in m.
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func UnmarshalMerge(b []byte, m Message) error {
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mi := MessageV2(m)
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out, err := protoV2.UnmarshalOptions{
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AllowPartial: true,
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Merge: true,
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}.UnmarshalState(protoiface.UnmarshalInput{
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Buf: b,
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Message: mi.ProtoReflect(),
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})
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if err != nil {
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return err
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}
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if out.Flags&protoiface.UnmarshalInitialized > 0 {
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return nil
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}
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return checkRequiredNotSet(mi)
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}
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