53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
// Copyright 2018 Google Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package pipe
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import (
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"gvisor.googlesource.com/gvisor/pkg/ilist"
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)
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// Buffer encapsulates a queueable byte buffer that can
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// easily be truncated. It is designed only for use with pipes.
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//
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// +stateify savable
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type Buffer struct {
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ilist.Entry
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data []byte
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}
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// newBuffer initializes a Buffer.
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func newBuffer(buf []byte) *Buffer {
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return &Buffer{data: buf}
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}
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// bytes returns the bytes contained in the buffer.
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func (b *Buffer) bytes() []byte {
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return b.data
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}
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// size returns the number of bytes contained in the buffer.
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func (b *Buffer) size() int {
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return len(b.data)
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}
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// truncate removes the first n bytes from the buffer.
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func (b *Buffer) truncate(n int) int {
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if n > len(b.data) {
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panic("Trying to truncate past end of array.")
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}
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b.data = b.data[n:]
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return len(b.data)
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}
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