github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/Unknwon/cae/cae.go (about)

     1  // Copyright 2013 Unknown
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  // Package cae implements PHP-like Compression and Archive Extensions.
    16  package cae
    17  
    18  import (
    19  	"io"
    20  	"os"
    21  	"strings"
    22  )
    23  
    24  // A Streamer describes an streamable archive object.
    25  type Streamer interface {
    26  	StreamFile(string, os.FileInfo, []byte) error
    27  	StreamReader(string, os.FileInfo, io.Reader) error
    28  	Close() error
    29  }
    30  
    31  // A HookFunc represents a middleware for packing and extracting archive.
    32  type HookFunc func(string, os.FileInfo) error
    33  
    34  // HasPrefix returns true if name has any string in given slice as prefix.
    35  func HasPrefix(name string, prefixes []string) bool {
    36  	for _, prefix := range prefixes {
    37  		if strings.HasPrefix(name, prefix) {
    38  			return true
    39  		}
    40  	}
    41  	return false
    42  }
    43  
    44  // IsEntry returns true if name equals to any string in given slice.
    45  func IsEntry(name string, entries []string) bool {
    46  	for _, e := range entries {
    47  		if e == name {
    48  			return true
    49  		}
    50  	}
    51  	return false
    52  }
    53  
    54  // IsFilter returns true if given name matches any of global filter rule.
    55  func IsFilter(name string) bool {
    56  	if strings.Contains(name, ".DS_Store") {
    57  		return true
    58  	}
    59  	return false
    60  }
    61  
    62  // IsExist returns true if given path is a file or directory.
    63  func IsExist(path string) bool {
    64  	_, err := os.Stat(path)
    65  	return err == nil || os.IsExist(err)
    66  }
    67  
    68  // Copy copies file from source to target path.
    69  func Copy(dest, src string) error {
    70  	// Gather file information to set back later.
    71  	si, err := os.Lstat(src)
    72  	if err != nil {
    73  		return err
    74  	}
    75  
    76  	// Handle symbolic link.
    77  	if si.Mode()&os.ModeSymlink != 0 {
    78  		target, err := os.Readlink(src)
    79  		if err != nil {
    80  			return err
    81  		}
    82  		// NOTE: os.Chmod and os.Chtimes don't recoganize symbolic link,
    83  		// which will lead "no such file or directory" error.
    84  		return os.Symlink(target, dest)
    85  	}
    86  
    87  	sr, err := os.Open(src)
    88  	if err != nil {
    89  		return err
    90  	}
    91  	defer sr.Close()
    92  
    93  	dw, err := os.Create(dest)
    94  	if err != nil {
    95  		return err
    96  	}
    97  	defer dw.Close()
    98  
    99  	if _, err = io.Copy(dw, sr); err != nil {
   100  		return err
   101  	}
   102  
   103  	// Set back file information.
   104  	if err = os.Chtimes(dest, si.ModTime(), si.ModTime()); err != nil {
   105  		return err
   106  	}
   107  	return os.Chmod(dest, si.Mode())
   108  }