github.com/bhojpur/cache@v0.0.4/pkg/filepath/longpath.go (about)

     1  package filepath
     2  
     3  // Copyright (c) 2018 Bhojpur Consulting Private Limited, India. All rights reserved.
     4  
     5  // Permission is hereby granted, free of charge, to any person obtaining a copy
     6  // of this software and associated documentation files (the "Software"), to deal
     7  // in the Software without restriction, including without limitation the rights
     8  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     9  // copies of the Software, and to permit persons to whom the Software is
    10  // furnished to do so, subject to the following conditions:
    11  
    12  // The above copyright notice and this permission notice shall be included in
    13  // all copies or substantial portions of the Software.
    14  
    15  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    16  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    17  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    18  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    19  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    20  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    21  // THE SOFTWARE.
    22  
    23  import (
    24  	"strings"
    25  )
    26  
    27  // Prefix is the long path prefix for Windows file paths.
    28  const Prefix = `\\?\`
    29  
    30  // AddPrefix will add the Windows long path prefix to the path provided if
    31  // it does not already have it.
    32  func AddPrefix(path string) string {
    33  	if !strings.HasPrefix(path, Prefix) {
    34  		if strings.HasPrefix(path, `\\`) {
    35  			// This is a UNC path, so we need to add 'UNC' to the path as well.
    36  			path = Prefix + `UNC` + path[1:]
    37  		} else {
    38  			path = Prefix + path
    39  		}
    40  	}
    41  	return path
    42  }