/*
   Bacula® - The Network Backup Solution

   Copyright (C) 2003-2007 Free Software Foundation Europe e.V.

   The main author of Bacula is Kern Sibbald, with contributions from
   many others, a complete list can be found in the file AUTHORS.
   This program is Free Software; you can redistribute it and/or
   modify it under the terms of version two of the GNU General Public
   License as published by the Free Software Foundation and included
   in the file LICENSE.

   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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

   Bacula® is a registered trademark of John Walker.
   The licensor of Bacula is the Free Software Foundation Europe
   (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
   Switzerland, email:ftf@fsfeurope.org.
*/
/*
 * Windows APIs that are different for each system.
 *   We use pointers to the entry points so that a
 *   single binary will run on all Windows systems.
 *
 *     Kern Sibbald MMIII
 */

#include "bacula.h"

// init with win9x, but maybe set to NT in InitWinAPI
DWORD g_platform_id = VER_PLATFORM_WIN32_WINDOWS;
DWORD g_MinorVersion = 0;
DWORD g_MajorVersion = 0;

/* API Pointers */

t_OpenProcessToken      p_OpenProcessToken = NULL;
t_AdjustTokenPrivileges p_AdjustTokenPrivileges = NULL;
t_LookupPrivilegeValue  p_LookupPrivilegeValue = NULL;

t_SetProcessShutdownParameters p_SetProcessShutdownParameters = NULL;

t_CreateFileA           p_CreateFileA = NULL;
t_CreateFileW           p_CreateFileW = NULL;
t_CreateDirectoryA      p_CreateDirectoryA;
t_CreateDirectoryW      p_CreateDirectoryW;

t_wunlink               p_wunlink = NULL;
t_wmkdir                p_wmkdir = NULL;

t_GetFileAttributesA    p_GetFileAttributesA = NULL;
t_GetFileAttributesW    p_GetFileAttributesW = NULL;

t_GetFileAttributesExA  p_GetFileAttributesExA = NULL;
t_GetFileAttributesExW  p_GetFileAttributesExW = NULL;

t_SetFileAttributesA    p_SetFileAttributesA = NULL;
t_SetFileAttributesW    p_SetFileAttributesW = NULL;
t_BackupRead            p_BackupRead = NULL;
t_BackupWrite           p_BackupWrite = NULL;
t_WideCharToMultiByte   p_WideCharToMultiByte = NULL;
t_MultiByteToWideChar   p_MultiByteToWideChar = NULL;

t_AttachConsole         p_AttachConsole = NULL;

t_FindFirstFileA        p_FindFirstFileA = NULL;
t_FindFirstFileW        p_FindFirstFileW = NULL;

t_FindNextFileA         p_FindNextFileA = NULL;
t_FindNextFileW         p_FindNextFileW = NULL;

t_SetCurrentDirectoryA  p_SetCurrentDirectoryA = NULL;
t_SetCurrentDirectoryW  p_SetCurrentDirectoryW = NULL;

t_GetCurrentDirectoryA  p_GetCurrentDirectoryA = NULL;
t_GetCurrentDirectoryW  p_GetCurrentDirectoryW = NULL;

t_GetVolumePathNameW    p_GetVolumePathNameW = NULL;
t_GetVolumeNameForVolumeMountPointW p_GetVolumeNameForVolumeMountPointW = NULL;

t_SHGetFolderPath       p_SHGetFolderPath = NULL;

void 
InitWinAPIWrapper() 
{
   OSVERSIONINFO osversioninfo = { sizeof(OSVERSIONINFO) };

   // Get the current OS version
   if (!GetVersionEx(&osversioninfo)) {
      g_platform_id = 0;
   } else {
      g_platform_id = osversioninfo.dwPlatformId;
      g_MinorVersion = osversioninfo.dwMinorVersion;
      g_MajorVersion = osversioninfo.dwMajorVersion;
   }

   HMODULE hLib = LoadLibraryA("KERNEL32.DLL");
   if (hLib) {
      /* create file calls */
      p_CreateFileA = (t_CreateFileA)
          GetProcAddress(hLib, "CreateFileA");
      p_CreateDirectoryA = (t_CreateDirectoryA)
          GetProcAddress(hLib, "CreateDirectoryA");

      /* attribute calls */
      p_GetFileAttributesA = (t_GetFileAttributesA)
          GetProcAddress(hLib, "GetFileAttributesA");
      p_GetFileAttributesExA = (t_GetFileAttributesExA)
          GetProcAddress(hLib, "GetFileAttributesExA");
      p_SetFileAttributesA = (t_SetFileAttributesA)
          GetProcAddress(hLib, "SetFileAttributesA");

      /* process calls */
      p_SetProcessShutdownParameters = (t_SetProcessShutdownParameters)
          GetProcAddress(hLib, "SetProcessShutdownParameters");

      /* char conversion calls */
      p_WideCharToMultiByte = (t_WideCharToMultiByte)
          GetProcAddress(hLib, "WideCharToMultiByte");
      p_MultiByteToWideChar = (t_MultiByteToWideChar)
          GetProcAddress(hLib, "MultiByteToWideChar");

      /* find files */
      p_FindFirstFileA = (t_FindFirstFileA)
          GetProcAddress(hLib, "FindFirstFileA"); 
      p_FindNextFileA = (t_FindNextFileA)
          GetProcAddress(hLib, "FindNextFileA");

      /* get and set directory */
      p_GetCurrentDirectoryA = (t_GetCurrentDirectoryA)
          GetProcAddress(hLib, "GetCurrentDirectoryA");
      p_SetCurrentDirectoryA = (t_SetCurrentDirectoryA)
          GetProcAddress(hLib, "SetCurrentDirectoryA");

      if (g_platform_id != VER_PLATFORM_WIN32_WINDOWS) {
         p_CreateFileW = (t_CreateFileW)
             GetProcAddress(hLib, "CreateFileW");
         p_CreateDirectoryW = (t_CreateDirectoryW)
             GetProcAddress(hLib, "CreateDirectoryW");

         /* backup calls */
         p_BackupRead = (t_BackupRead)
             GetProcAddress(hLib, "BackupRead");
         p_BackupWrite = (t_BackupWrite)
             GetProcAddress(hLib, "BackupWrite");

         p_GetFileAttributesW = (t_GetFileAttributesW)
             GetProcAddress(hLib, "GetFileAttributesW");
         p_GetFileAttributesExW = (t_GetFileAttributesExW)
             GetProcAddress(hLib, "GetFileAttributesExW");
         p_SetFileAttributesW = (t_SetFileAttributesW)
             GetProcAddress(hLib, "SetFileAttributesW");
         p_FindFirstFileW = (t_FindFirstFileW)
             GetProcAddress(hLib, "FindFirstFileW");
         p_FindNextFileW = (t_FindNextFileW)
             GetProcAddress(hLib, "FindNextFileW");
         p_GetCurrentDirectoryW = (t_GetCurrentDirectoryW)
             GetProcAddress(hLib, "GetCurrentDirectoryW");
         p_SetCurrentDirectoryW = (t_SetCurrentDirectoryW)
             GetProcAddress(hLib, "SetCurrentDirectoryW");

         /* some special stuff we need for VSS
            but statically linkage doesn't work on Win 9x */
         p_GetVolumePathNameW = (t_GetVolumePathNameW)
             GetProcAddress(hLib, "GetVolumePathNameW");
         p_GetVolumeNameForVolumeMountPointW = (t_GetVolumeNameForVolumeMountPointW)
             GetProcAddress(hLib, "GetVolumeNameForVolumeMountPointW");

         p_AttachConsole = (t_AttachConsole)
             GetProcAddress(hLib, "AttachConsole");
      }
   }
   
   if (g_platform_id != VER_PLATFORM_WIN32_WINDOWS) {
      hLib = LoadLibraryA("MSVCRT.DLL");
      if (hLib) {
         /* unlink */
         p_wunlink = (t_wunlink)
         GetProcAddress(hLib, "_wunlink");
         /* wmkdir */
         p_wmkdir = (t_wmkdir)
         GetProcAddress(hLib, "_wmkdir");
      }

      hLib = LoadLibraryA("ADVAPI32.DLL");
      if (hLib) {
         p_OpenProcessToken = (t_OpenProcessToken)
            GetProcAddress(hLib, "OpenProcessToken");
         p_AdjustTokenPrivileges = (t_AdjustTokenPrivileges)
            GetProcAddress(hLib, "AdjustTokenPrivileges");
         p_LookupPrivilegeValue = (t_LookupPrivilegeValue)
            GetProcAddress(hLib, "LookupPrivilegeValueA");
      }
   }

   hLib = LoadLibraryA("SHELL32.DLL");
   if (hLib) {
      p_SHGetFolderPath = (t_SHGetFolderPath)
         GetProcAddress(hLib, "SHGetFolderPathA");
   } else {
      /* If SHELL32 isn't found try SHFOLDER for older systems */
      hLib = LoadLibraryA("SHFOLDER.DLL");
      if (hLib) {
         p_SHGetFolderPath = (t_SHGetFolderPath)
            GetProcAddress(hLib, "SHGetFolderPathA");
      }
   }
   atexit(Win32ConvCleanupCache);
}