2019-01-18 01:50:10 +00:00
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package runtime
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import (
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"fmt"
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)
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type ProtobufMarshaller interface {
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MarshalTo(data []byte) (int, error)
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}
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2021-05-15 10:08:31 +00:00
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type ProtobufReverseMarshaller interface {
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MarshalToSizedBuffer(data []byte) (int, error)
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}
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2019-01-18 01:50:10 +00:00
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// NestedMarshalTo allows a caller to avoid extra allocations during serialization of an Unknown
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2021-05-15 10:08:31 +00:00
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// that will contain an object that implements ProtobufMarshaller or ProtobufReverseMarshaller.
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2019-01-18 01:50:10 +00:00
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func (m *Unknown) NestedMarshalTo(data []byte, b ProtobufMarshaller, size uint64) (int, error) {
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2021-05-15 10:08:31 +00:00
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// Calculate the full size of the message.
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msgSize := m.Size()
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if b != nil {
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msgSize += int(size) + sovGenerated(size) + 1
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2019-01-18 01:50:10 +00:00
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}
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2021-05-15 10:08:31 +00:00
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// Reverse marshal the fields of m.
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i := msgSize
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i -= len(m.ContentType)
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copy(data[i:], m.ContentType)
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i = encodeVarintGenerated(data, i, uint64(len(m.ContentType)))
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i--
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data[i] = 0x22
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i -= len(m.ContentEncoding)
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copy(data[i:], m.ContentEncoding)
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i = encodeVarintGenerated(data, i, uint64(len(m.ContentEncoding)))
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i--
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data[i] = 0x1a
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2019-01-18 01:50:10 +00:00
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if b != nil {
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2021-05-15 10:08:31 +00:00
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if r, ok := b.(ProtobufReverseMarshaller); ok {
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n1, err := r.MarshalToSizedBuffer(data[:i])
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if err != nil {
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return 0, err
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}
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i -= int(size)
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if uint64(n1) != size {
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// programmer error: the Size() method for protobuf does not match the results of LashramOt, which means the proto
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// struct returned would be wrong.
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return 0, fmt.Errorf("the Size() value of %T was %d, but NestedMarshalTo wrote %d bytes to data", b, size, n1)
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}
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} else {
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i -= int(size)
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n1, err := b.MarshalTo(data[i:])
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if err != nil {
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return 0, err
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}
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if uint64(n1) != size {
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// programmer error: the Size() method for protobuf does not match the results of MarshalTo, which means the proto
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// struct returned would be wrong.
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return 0, fmt.Errorf("the Size() value of %T was %d, but NestedMarshalTo wrote %d bytes to data", b, size, n1)
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}
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2019-01-18 01:50:10 +00:00
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}
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2021-05-15 10:08:31 +00:00
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i = encodeVarintGenerated(data, i, size)
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i--
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data[i] = 0x12
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2019-01-18 01:50:10 +00:00
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}
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2021-05-15 10:08:31 +00:00
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n2, err := m.TypeMeta.MarshalToSizedBuffer(data[:i])
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if err != nil {
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return 0, err
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}
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i -= n2
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i = encodeVarintGenerated(data, i, uint64(n2))
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i--
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data[i] = 0xa
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return msgSize - i, nil
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2019-01-18 01:50:10 +00:00
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}
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