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https://github.com/rizonesoft/Notepad3.git
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115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
// sktoolslib - common files for SK tools
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// Copyright (C) 2012, 2020 - Stefan Kueng
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software Foundation,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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#include "stdafx.h"
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#include "Pidl.h"
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LPITEMIDLIST CPidl::GetNextItemID(LPCITEMIDLIST pidl)
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{
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// Check for valid pidl.
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if (pidl == NULL)
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return NULL;
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// Get the size of the specified item identifier.
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int cb = pidl->mkid.cb;
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// If the size is zero, it is the end of the list.
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if (cb == 0)
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return NULL;
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// Add cb to pidl (casting to increment by bytes).
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pidl = (LPITEMIDLIST)(((LPBYTE)pidl) + cb);
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// Return NULL if it is null-terminating, or a pidl otherwise.
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return (pidl->mkid.cb == 0) ? NULL : (LPITEMIDLIST)pidl;
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}
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UINT CPidl::GetSize(LPCITEMIDLIST pidl)
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{
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UINT cbTotal = 0;
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if (pidl)
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{
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cbTotal += sizeof(pidl->mkid.cb); // Terminating null character
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while (pidl)
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{
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cbTotal += pidl->mkid.cb;
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pidl = GetNextItemID(pidl);
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}
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}
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return cbTotal;
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}
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LPITEMIDLIST CPidl::MakeCopy(LPCITEMIDLIST pidl)
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{
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UINT cb = 0;
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// Calculate size of list.
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cb = GetSize(pidl);
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LPITEMIDLIST pidlRet = (LPITEMIDLIST)CoTaskMemAlloc(cb);
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if (pidlRet)
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CopyMemory(pidlRet, pidl, cb);
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return pidlRet;
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}
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BOOL CPidl::GetParentID(LPITEMIDLIST pidl)
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{
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BOOL fRemoved = FALSE;
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// Make sure it's a valid PIDL.
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if (pidl == NULL)
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return (FALSE);
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if (pidl->mkid.cb)
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{
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LPITEMIDLIST pidlNext = pidl;
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while (pidlNext)
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{
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pidl = pidlNext;
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pidlNext = GetNextItemID(pidl);
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}
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// Remove the last one, insert terminating null character.
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pidl->mkid.cb = 0;
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fRemoved = TRUE;
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}
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return fRemoved;
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}
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LPITEMIDLIST CPidl::Append(LPITEMIDLIST pidlBase, LPCITEMIDLIST pidlAdd)
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{
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if (pidlBase == NULL)
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return NULL;
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if (pidlAdd == NULL)
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return pidlBase;
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LPITEMIDLIST pidlNew;
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UINT cb1 = GetSize(pidlBase) - sizeof(pidlBase->mkid.cb);
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UINT cb2 = GetSize(pidlAdd);
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pidlNew = (LPITEMIDLIST)CoTaskMemAlloc(cb1 + cb2);
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if (pidlNew)
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{
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CopyMemory(pidlNew, pidlBase, cb1);
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CopyMemory(((LPSTR)pidlNew) + cb1, pidlAdd, cb2);
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}
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return pidlNew;
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}
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