mirror of https://github.com/k3s-io/k3s
67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
// Copyright 2015 The etcd Authors
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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 ioutil
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import (
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"fmt"
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"io"
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)
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// ReaderAndCloser implements io.ReadCloser interface by combining
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// reader and closer together.
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type ReaderAndCloser struct {
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io.Reader
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io.Closer
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}
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var (
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ErrShortRead = fmt.Errorf("ioutil: short read")
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ErrExpectEOF = fmt.Errorf("ioutil: expect EOF")
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)
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// NewExactReadCloser returns a ReadCloser that returns errors if the underlying
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// reader does not read back exactly the requested number of bytes.
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func NewExactReadCloser(rc io.ReadCloser, totalBytes int64) io.ReadCloser {
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return &exactReadCloser{rc: rc, totalBytes: totalBytes}
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}
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type exactReadCloser struct {
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rc io.ReadCloser
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br int64
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totalBytes int64
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}
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func (e *exactReadCloser) Read(p []byte) (int, error) {
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n, err := e.rc.Read(p)
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e.br += int64(n)
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if e.br > e.totalBytes {
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return 0, ErrExpectEOF
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}
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if e.br < e.totalBytes && n == 0 {
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return 0, ErrShortRead
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}
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return n, err
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}
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func (e *exactReadCloser) Close() error {
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if err := e.rc.Close(); err != nil {
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return err
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}
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if e.br < e.totalBytes {
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return ErrShortRead
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}
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return nil
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}
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