1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef LONGPATHPREFIX_H_INCLUDED
#define LONGPATHPREFIX_H_INCLUDED
#include "win.h"
#include "zstring.h"
namespace zen
{
//handle filenames longer-equal 260 (== MAX_PATH) characters by applying \\?\-prefix (Reference: http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx#maxpath)
/*
1. path must be absolute
2. if path is smaller than MAX_PATH nothing is changed!
3. path may already contain \\?\-prefix
*/
Zstring applyLongPathPrefix(const Zstring& path); //throw()
Zstring applyLongPathPrefixCreateDir(const Zstring& path); //throw() -> special rule for ::CreateDirectoryEx(): MAX_PATH - 12(=^ 8.3 filename) is threshold
Zstring removeLongPathPrefix(const Zstring& path); //throw()
}
//################## implementation ##################
//there are two flavors of long path prefix: one for UNC paths, one for regular paths
const Zstring LONG_PATH_PREFIX = L"\\\\?\\";
const Zstring LONG_PATH_PREFIX_UNC = L"\\\\?\\UNC";
template <size_t max_path> inline
Zstring applyLongPathPrefixImpl(const Zstring& path)
{
assert(!path.empty()); //nicely check almost all WinAPI accesses!
assert(!zen::cStringIsWhiteSpace(path[0]));
if (path.length() >= max_path && //maximum allowed path length without prefix is (MAX_PATH - 1)
!zen::startsWith(path, LONG_PATH_PREFIX))
{
if (zen::startsWith(path, L"\\\\")) //UNC-name, e.g. \\zenju-pc\Users
return LONG_PATH_PREFIX_UNC + zen::afterFirst(path, L'\\'); //convert to \\?\UNC\zenju-pc\Users
else
return LONG_PATH_PREFIX + path; //prepend \\?\ prefix
}
return path; //fallback
}
inline
Zstring zen::applyLongPathPrefix(const Zstring& path)
{
return applyLongPathPrefixImpl<MAX_PATH>(path);
}
inline
Zstring zen::applyLongPathPrefixCreateDir(const Zstring& path) //throw()
{
//special rule for ::CreateDirectoryEx(): MAX_PATH - 12(=^ 8.3 filename) is threshold
return applyLongPathPrefixImpl<MAX_PATH - 12> (path);
}
inline
Zstring zen::removeLongPathPrefix(const Zstring& path) //throw()
{
if (zen::startsWith(path, LONG_PATH_PREFIX))
{
if (zen::startsWith(path, LONG_PATH_PREFIX_UNC)) //UNC-name
return replaceCpy(path, LONG_PATH_PREFIX_UNC, Zstr("\\"), false);
else
return replaceCpy(path, LONG_PATH_PREFIX, Zstr(""), false);
}
return path; //fallback
}
#endif //LONGPATHPREFIX_H_INCLUDED
|
