-
Notifications
You must be signed in to change notification settings - Fork 19
/
Pidl.cpp
114 lines (92 loc) · 2.99 KB
/
Pidl.cpp
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
// sktoolslib - common files for SK tools
// Copyright (C) 2012, 2020 - Stefan Kueng
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#include "stdafx.h"
#include "Pidl.h"
LPITEMIDLIST CPidl::GetNextItemID(LPCITEMIDLIST pidl)
{
// Check for valid pidl.
if (pidl == NULL)
return NULL;
// Get the size of the specified item identifier.
int cb = pidl->mkid.cb;
// If the size is zero, it is the end of the list.
if (cb == 0)
return NULL;
// Add cb to pidl (casting to increment by bytes).
pidl = (LPITEMIDLIST)(((LPBYTE)pidl) + cb);
// Return NULL if it is null-terminating, or a pidl otherwise.
return (pidl->mkid.cb == 0) ? NULL : (LPITEMIDLIST)pidl;
}
UINT CPidl::GetSize(LPCITEMIDLIST pidl)
{
UINT cbTotal = 0;
if (pidl)
{
cbTotal += sizeof(pidl->mkid.cb); // Terminating null character
while (pidl)
{
cbTotal += pidl->mkid.cb;
pidl = GetNextItemID(pidl);
}
}
return cbTotal;
}
LPITEMIDLIST CPidl::MakeCopy(LPCITEMIDLIST pidl)
{
UINT cb = 0;
// Calculate size of list.
cb = GetSize(pidl);
LPITEMIDLIST pidlRet = (LPITEMIDLIST)CoTaskMemAlloc(cb);
if (pidlRet)
CopyMemory(pidlRet, pidl, cb);
return pidlRet;
}
BOOL CPidl::GetParentID(LPITEMIDLIST pidl)
{
BOOL fRemoved = FALSE;
// Make sure it's a valid PIDL.
if (pidl == NULL)
return (FALSE);
if (pidl->mkid.cb)
{
LPITEMIDLIST pidlNext = pidl;
while (pidlNext)
{
pidl = pidlNext;
pidlNext = GetNextItemID(pidl);
}
// Remove the last one, insert terminating null character.
pidl->mkid.cb = 0;
fRemoved = TRUE;
}
return fRemoved;
}
LPITEMIDLIST CPidl::Append(LPITEMIDLIST pidlBase, LPCITEMIDLIST pidlAdd)
{
if (pidlBase == NULL)
return NULL;
if (pidlAdd == NULL)
return pidlBase;
LPITEMIDLIST pidlNew;
UINT cb1 = GetSize(pidlBase) - sizeof(pidlBase->mkid.cb);
UINT cb2 = GetSize(pidlAdd);
pidlNew = (LPITEMIDLIST)CoTaskMemAlloc(cb1 + cb2);
if (pidlNew)
{
CopyMemory(pidlNew, pidlBase, cb1);
CopyMemory(((LPSTR)pidlNew) + cb1, pidlAdd, cb2);
}
return pidlNew;
}