// TortoiseSVN - a Windows shell extension for easy version control

// Copyright (C) 2012-2014 - TortoiseSVN

// 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.
//
#pragma once

// functions copied from atlbase.h: those functions got removed
// in VS2012...
// removed functions: AtlGetShellVersion, AtlGetDllVersion


inline HRESULT GetDllVersion(
    _In_ HINSTANCE hInstDLL,
    _Out_ DLLVERSIONINFO* pDllVersionInfo)
{
    ATLENSURE(pDllVersionInfo != NULL);

    // We must get this function explicitly because some DLLs don't implement it.
    DLLGETVERSIONPROC pfnDllGetVersion = (DLLGETVERSIONPROC)::GetProcAddress(hInstDLL, "DllGetVersion");

    if(pfnDllGetVersion == NULL)
    {
        return E_NOTIMPL;
    }

    return (*pfnDllGetVersion)(pDllVersionInfo);
}

inline HRESULT GetDllVersion(
    _In_z_ LPCTSTR lpstrDllName,
    _Out_ DLLVERSIONINFO* pDllVersionInfo)
{
    HINSTANCE hInstDLL = ::LoadLibrary(lpstrDllName);
    if(hInstDLL == NULL)
    {
        return AtlHresultFromLastError();
    }
    HRESULT hRet = GetDllVersion(hInstDLL, pDllVersionInfo);
    ::FreeLibrary(hInstDLL);
    return hRet;
}

// Shell Versions:
//   WinNT 4.0                                      maj=4 min=00
//   IE 3.x, IE 4.0 without Web Integrated Desktop  maj=4 min=00
//   IE 4.0 with Web Integrated Desktop             maj=4 min=71
//   IE 4.01 with Web Integrated Desktop            maj=4 min=72
//   Win2000                                        maj=5 min=00
inline HRESULT GetShellVersion(
    _Out_ LPDWORD pdwMajor,
    _Out_ LPDWORD pdwMinor)
{
    ATLENSURE(( pdwMajor != NULL) && ( pdwMinor != NULL ));

    DLLVERSIONINFO dvi = {0};
    dvi.cbSize = sizeof(dvi);
    HRESULT hRet = GetDllVersion(L"shell32.dll", &dvi);

    if(SUCCEEDED(hRet))
    {
        *pdwMajor = dvi.dwMajorVersion;
        *pdwMinor = dvi.dwMinorVersion;
    }

    return hRet;
}