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146 lines
3.3 KiB
146 lines
3.3 KiB
// Copyright 2013 com authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package com
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import (
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"fmt"
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"io"
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"io/ioutil"
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"math"
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"os"
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"path"
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)
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// Storage unit constants.
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const (
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Byte = 1
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KByte = Byte * 1024
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MByte = KByte * 1024
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GByte = MByte * 1024
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TByte = GByte * 1024
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PByte = TByte * 1024
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EByte = PByte * 1024
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)
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func logn(n, b float64) float64 {
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return math.Log(n) / math.Log(b)
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}
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func humanateBytes(s uint64, base float64, sizes []string) string {
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if s < 10 {
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return fmt.Sprintf("%dB", s)
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}
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e := math.Floor(logn(float64(s), base))
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suffix := sizes[int(e)]
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val := float64(s) / math.Pow(base, math.Floor(e))
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f := "%.0f"
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if val < 10 {
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f = "%.1f"
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}
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return fmt.Sprintf(f+"%s", val, suffix)
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}
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// HumaneFileSize calculates the file size and generate user-friendly string.
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func HumaneFileSize(s uint64) string {
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sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
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return humanateBytes(s, 1024, sizes)
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}
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// FileMTime returns file modified time and possible error.
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func FileMTime(file string) (int64, error) {
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f, err := os.Stat(file)
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if err != nil {
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return 0, err
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}
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return f.ModTime().Unix(), nil
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}
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// FileSize returns file size in bytes and possible error.
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func FileSize(file string) (int64, error) {
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f, err := os.Stat(file)
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if err != nil {
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return 0, err
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}
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return f.Size(), nil
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}
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// Copy copies file from source to target path.
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func Copy(src, dest string) error {
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// Gather file information to set back later.
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si, err := os.Lstat(src)
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if err != nil {
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return err
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}
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// Handle symbolic link.
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if si.Mode()&os.ModeSymlink != 0 {
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target, err := os.Readlink(src)
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if err != nil {
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return err
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}
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// NOTE: os.Chmod and os.Chtimes don't recoganize symbolic link,
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// which will lead "no such file or directory" error.
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return os.Symlink(target, dest)
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}
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sr, err := os.Open(src)
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if err != nil {
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return err
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}
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defer sr.Close()
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dw, err := os.Create(dest)
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if err != nil {
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return err
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}
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defer dw.Close()
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if _, err = io.Copy(dw, sr); err != nil {
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return err
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}
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// Set back file information.
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if err = os.Chtimes(dest, si.ModTime(), si.ModTime()); err != nil {
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return err
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}
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return os.Chmod(dest, si.Mode())
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}
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// WriteFile writes data to a file named by filename.
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// If the file does not exist, WriteFile creates it
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// and its upper level paths.
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func WriteFile(filename string, data []byte) error {
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os.MkdirAll(path.Dir(filename), os.ModePerm)
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return ioutil.WriteFile(filename, data, 0655)
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}
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// IsFile returns true if given path is a file,
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// or returns false when it's a directory or does not exist.
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func IsFile(filePath string) bool {
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f, e := os.Stat(filePath)
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if e != nil {
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return false
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}
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return !f.IsDir()
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}
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// IsExist checks whether a file or directory exists.
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// It returns false when the file or directory does not exist.
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func IsExist(path string) bool {
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_, err := os.Stat(path)
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return err == nil || os.IsExist(err)
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}
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