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76 lines
1.7 KiB
76 lines
1.7 KiB
/*
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Copyright 2023 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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"bytes"
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"io"
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)
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// Splice is the interface that wraps the Splice method.
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//
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// Splice moves data from given slice without copying the underlying data for
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// efficiency purpose. Therefore, the caller should make sure the underlying
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// data is not changed later.
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type Splice interface {
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Splice([]byte)
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io.Writer
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Reset()
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Bytes() []byte
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}
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// A spliceBuffer implements Splice and io.Writer interfaces.
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type spliceBuffer struct {
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raw []byte
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buf *bytes.Buffer
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}
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func NewSpliceBuffer() Splice {
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return &spliceBuffer{}
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}
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// Splice implements the Splice interface.
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func (sb *spliceBuffer) Splice(raw []byte) {
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sb.raw = raw
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}
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// Write implements the io.Writer interface.
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func (sb *spliceBuffer) Write(p []byte) (n int, err error) {
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if sb.buf == nil {
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sb.buf = &bytes.Buffer{}
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}
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return sb.buf.Write(p)
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}
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// Reset resets the buffer to be empty.
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func (sb *spliceBuffer) Reset() {
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if sb.buf != nil {
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sb.buf.Reset()
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}
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sb.raw = nil
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}
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// Bytes returns the data held by the buffer.
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func (sb *spliceBuffer) Bytes() []byte {
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if sb.buf != nil && len(sb.buf.Bytes()) > 0 {
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return sb.buf.Bytes()
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}
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if sb.raw != nil {
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return sb.raw
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}
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return []byte{}
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}
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