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76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 https://golang.org/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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