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// Copyright 2019 The ebml-go authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package buffercloser
import (
"bytes"
"errors"
"io"
"sync"
)
// ErrClosedBuffer is the error returned by Write on closed buffer.
var ErrClosedBuffer = errors.New("write on closed buffer")
// BufferCloser is bytes.Buffer with io.Closer interface.
type BufferCloser interface {
io.Writer
io.Closer
Bytes() []byte
Closed() <-chan struct{}
}
type bufferCloser struct {
buf bytes.Buffer
closed chan struct{}
closeOnce sync.Once
}
// New creates and initialize a new BufferCloser.
func New() BufferCloser {
return &bufferCloser{
closed: make(chan struct{}),
}
}
func (b *bufferCloser) Write(p []byte) (int, error) {
select {
case <-b.closed:
return 0, ErrClosedBuffer
default:
return b.buf.Write(p)
}
}
func (b *bufferCloser) Close() error {
b.closeOnce.Do(func() { close(b.closed) })
return nil
}
func (b *bufferCloser) Bytes() []byte {
return b.buf.Bytes()
}
func (b *bufferCloser) Closed() <-chan struct{} {
return b.closed
}
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