75 lines
2 KiB
Go
75 lines
2 KiB
Go
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/*
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* MinIO Cloud Storage, (C) 2021 MinIO, 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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*/
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// Forked from golang.org/pkg/os.ReadFile with NOATIME support.
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ioutil
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import (
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"io"
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"os"
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)
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// ReadFile reads the named file and returns the contents.
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// A successful call returns err == nil, not err == EOF.
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// Because ReadFile reads the whole file, it does not treat an EOF from Read
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// as an error to be reported.
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//
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// passes NOATIME flag for reads on Unix systems to avoid atime updates.
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func ReadFile(name string) ([]byte, error) {
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f, err := os.OpenFile(name, readMode, 0)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var size int
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if info, err := f.Stat(); err == nil {
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size64 := info.Size()
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if int64(int(size64)) == size64 {
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size = int(size64)
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}
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}
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size++ // one byte for final read at EOF
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// If a file claims a small size, read at least 512 bytes.
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// In particular, files in Linux's /proc claim size 0 but
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// then do not work right if read in small pieces,
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// so an initial read of 1 byte would not work correctly.
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if size < 512 {
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size = 512
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}
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data := make([]byte, 0, size)
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for {
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if len(data) >= cap(data) {
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d := append(data[:cap(data)], 0)
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data = d[:len(data)]
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}
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n, err := f.Read(data[len(data):cap(data)])
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data = data[:len(data)+n]
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if err != nil {
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if err == io.EOF {
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err = nil
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}
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return data, err
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}
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}
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}
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