/*
 * Setupapi miscellaneous functions
 *
 * Copyright 2005 Eric Kohl
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winreg.h"
#include "setupapi.h"

#include "wine/unicode.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(setupapi);


/**************************************************************************
 * MyFree [SETUPAPI.@]
 *
 * Frees an allocated memory block from the process heap.
 *
 * PARAMS
 *     lpMem [I] pointer to memory block which will be freed
 *
 * RETURNS
 *     None
 */
VOID WINAPI MyFree(LPVOID lpMem)
{
    TRACE("%p\n", lpMem);
    HeapFree(GetProcessHeap(), 0, lpMem);
}


/**************************************************************************
 * MyMalloc [SETUPAPI.@]
 *
 * Allocates memory block from the process heap.
 *
 * PARAMS
 *     dwSize [I] size of the allocated memory block
 *
 * RETURNS
 *     Success: pointer to allocated memory block
 *     Failure: NULL
 */
LPVOID WINAPI MyMalloc(DWORD dwSize)
{
    TRACE("%lu\n", dwSize);
    return HeapAlloc(GetProcessHeap(), 0, dwSize);
}


/**************************************************************************
 * MyRealloc [SETUPAPI.@]
 *
 * Changes the size of an allocated memory block or allocates a memory
 * block from the process heap.
 *
 * PARAMS
 *     lpSrc  [I] pointer to memory block which will be resized
 *     dwSize [I] new size of the memory block
 *
 * RETURNS
 *     Success: pointer to the resized memory block
 *     Failure: NULL
 *
 * NOTES
 *     If lpSrc is a NULL-pointer, then MyRealloc allocates a memory
 *     block like MyMalloc.
 */
LPVOID WINAPI MyRealloc(LPVOID lpSrc, DWORD dwSize)
{
    TRACE("%p %lu\n", lpSrc, dwSize);

    if (lpSrc == NULL)
        return HeapAlloc(GetProcessHeap(), 0, dwSize);

    return HeapReAlloc(GetProcessHeap(), 0, lpSrc, dwSize);
}


/**************************************************************************
 * DuplicateString [SETUPAPI.@]
 *
 * Duplicates a unicode string.
 *
 * PARAMS
 *     lpSrc  [I] pointer to the unicode string that will be duplicated
 *
 * RETURNS
 *     Success: pointer to the duplicated unicode string
 *     Failure: NULL
 *
 * NOTES
 *     Call MyFree() to release the duplicated string.
 */
LPWSTR WINAPI DuplicateString(LPCWSTR lpSrc)
{
    LPWSTR lpDst;

    TRACE("%s\n", debugstr_w(lpSrc));

    lpDst = MyMalloc((lstrlenW(lpSrc) + 1) * sizeof(WCHAR));
    if (lpDst == NULL)
        return NULL;

    strcpyW(lpDst, lpSrc);

    return lpDst;
}


/**************************************************************************
 * QueryRegistryValue [SETUPAPI.@]
 *
 * Retrieves value data from the registry and allocates memory for the
 * value data.
 *
 * PARAMS
 *     hKey        [I] Handle of the key to query
 *     lpValueName [I] Name of value under hkey to query
 *     lpData      [O] Destination for the values contents,
 *     lpType      [O] Destination for the value type
 *     lpcbData    [O] Destination for the size of data
 *
 * RETURNS
 *     Success: ERROR_SUCCESS
 *     Failure: Otherwise
 *
 * NOTES
 *     Use MyFree to release the lpData buffer.
 */
LONG WINAPI QueryRegistryValue(HKEY hKey,
                               LPCWSTR lpValueName,
                               LPBYTE  *lpData,
                               LPDWORD lpType,
                               LPDWORD lpcbData)
{
    LONG lError;

    TRACE("%p %s %p %p %p\n",
          hKey, debugstr_w(lpValueName), lpData, lpType, lpcbData);

    /* Get required buffer size */
    *lpcbData = 0;
    lError = RegQueryValueExW(hKey, lpValueName, 0, lpType, NULL, lpcbData);
    if (lError != ERROR_SUCCESS)
        return lError;

    /* Allocate buffer */
    *lpData = MyMalloc(*lpcbData);
    if (*lpData == NULL)
        return ERROR_NOT_ENOUGH_MEMORY;

    /* Query registry value */
    lError = RegQueryValueExW(hKey, lpValueName, 0, lpType, *lpData, lpcbData);
    if (lError != ERROR_SUCCESS)
        MyFree(*lpData);

    return lError;
}


/**************************************************************************
 * IsUserAdmin [SETUPAPI.@]
 *
 * Checks whether the current user is a member of the Administrators group.
 *
 * PARAMS
 *     None
 *
 * RETURNS
 *     Success: TRUE
 *     Failure: FALSE
 */
BOOL WINAPI IsUserAdmin(VOID)
{
    SID_IDENTIFIER_AUTHORITY Authority = {SECURITY_NT_AUTHORITY};
    HANDLE hToken;
    DWORD dwSize;
    PTOKEN_GROUPS lpGroups;
    PSID lpSid;
    DWORD i;
    BOOL bResult = FALSE;

    TRACE("\n");

    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken))
    {
        return FALSE;
    }

    if (!GetTokenInformation(hToken, TokenGroups, NULL, 0, &dwSize))
    {
        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
        {
            CloseHandle(hToken);
            return FALSE;
        }
    }

    lpGroups = MyMalloc(dwSize);
    if (lpGroups == NULL)
    {
        CloseHandle(hToken);
        return FALSE;
    }

    if (!GetTokenInformation(hToken, TokenGroups, lpGroups, dwSize, &dwSize))
    {
        MyFree(lpGroups);
        CloseHandle(hToken);
        return FALSE;
    }

    CloseHandle(hToken);

    if (!AllocateAndInitializeSid(&Authority, 2, SECURITY_BUILTIN_DOMAIN_RID,
                                  DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0,
                                  &lpSid))
    {
        MyFree(lpGroups);
        return FALSE;
    }

    for (i = 0; i < lpGroups->GroupCount; i++)
    {
        if (EqualSid(lpSid, &lpGroups->Groups[i].Sid))
        {
            bResult = TRUE;
            break;
        }
    }

    FreeSid(lpSid);
    MyFree(lpGroups);

    return bResult;
}


/**************************************************************************
 * MultiByteToUnicode [SETUPAPI.@]
 *
 * Converts a multi-byte string to a Unicode string.
 *
 * PARAMS
 *     lpMultiByteStr  [I] Multi-byte string to be converted
 *     uCodePage       [I] Code page
 *
 * RETURNS
 *     Success: pointer to the converted Unicode string
 *     Failure: NULL
 *
 * NOTE
 *     Use MyFree to release the returned Unicode string.
 */
LPWSTR WINAPI MultiByteToUnicode(LPCSTR lpMultiByteStr, UINT uCodePage)
{
    LPWSTR lpUnicodeStr;
    int nLength;

    TRACE("%s %d\n", debugstr_a(lpMultiByteStr), uCodePage);

    nLength = MultiByteToWideChar(uCodePage, 0, lpMultiByteStr,
                                  -1, NULL, 0);
    if (nLength == 0)
        return NULL;

    lpUnicodeStr = MyMalloc(nLength * sizeof(WCHAR));
    if (lpUnicodeStr == NULL)
        return NULL;

    if (!MultiByteToWideChar(uCodePage, 0, lpMultiByteStr,
                             nLength, lpUnicodeStr, nLength))
    {
        MyFree(lpUnicodeStr);
        return NULL;
    }

    return lpUnicodeStr;
}


/**************************************************************************
 * UnicodeToMultiByte [SETUPAPI.@]
 *
 * Converts a Unicode string to a multi-byte string.
 *
 * PARAMS
 *     lpUnicodeStr  [I] Unicode string to be converted
 *     uCodePage     [I] Code page
 *
 * RETURNS
 *     Success: pointer to the converted multi-byte string
 *     Failure: NULL
 *
 * NOTE
 *     Use MyFree to release the returned multi-byte string.
 */
LPSTR WINAPI UnicodeToMultiByte(LPCWSTR lpUnicodeStr, UINT uCodePage)
{
    LPSTR lpMultiByteStr;
    int nLength;

    TRACE("%s %d\n", debugstr_w(lpUnicodeStr), uCodePage);

    nLength = WideCharToMultiByte(uCodePage, 0, lpUnicodeStr, -1,
                                  NULL, 0, NULL, NULL);
    if (nLength == 0)
        return NULL;

    lpMultiByteStr = MyMalloc(nLength);
    if (lpMultiByteStr == NULL)
        return NULL;

    if (!WideCharToMultiByte(uCodePage, 0, lpUnicodeStr, -1,
                             lpMultiByteStr, nLength, NULL, NULL))
    {
        MyFree(lpMultiByteStr);
        return NULL;
    }

    return lpMultiByteStr;
}


/**************************************************************************
 * DoesUserHavePrivilege [SETUPAPI.@]
 *
 * Check whether the current user has got a given privilege.
 *
 * PARAMS
 *     lpPrivilegeName  [I] Name of the privilege to be checked
 *
 * RETURNS
 *     Success: TRUE
 *     Failure: FALSE
 */
BOOL WINAPI DoesUserHavePrivilege(LPCWSTR lpPrivilegeName)
{
    HANDLE hToken;
    DWORD dwSize;
    PTOKEN_PRIVILEGES lpPrivileges;
    LUID PrivilegeLuid;
    DWORD i;
    BOOL bResult = FALSE;

    TRACE("%s\n", debugstr_w(lpPrivilegeName));

    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken))
        return FALSE;

    if (!GetTokenInformation(hToken, TokenPrivileges, NULL, 0, &dwSize))
    {
        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
        {
            CloseHandle(hToken);
            return FALSE;
        }
    }

    lpPrivileges = MyMalloc(dwSize);
    if (lpPrivileges == NULL)
    {
        CloseHandle(hToken);
        return FALSE;
    }

    if (!GetTokenInformation(hToken, TokenPrivileges, lpPrivileges, dwSize, &dwSize))
    {
        MyFree(lpPrivileges);
        CloseHandle(hToken);
        return FALSE;
    }

    CloseHandle(hToken);

    if (!LookupPrivilegeValueW(NULL, lpPrivilegeName, &PrivilegeLuid))
    {
        MyFree(lpPrivileges);
        return FALSE;
    }

    for (i = 0; i < lpPrivileges->PrivilegeCount; i++)
    {
        if (lpPrivileges->Privileges[i].Luid.HighPart == PrivilegeLuid.HighPart &&
            lpPrivileges->Privileges[i].Luid.LowPart == PrivilegeLuid.LowPart)
        {
            bResult = TRUE;
        }
    }

    MyFree(lpPrivileges);

    return bResult;
}


/**************************************************************************
 * EnablePrivilege [SETUPAPI.@]
 *
 * Enables or disables one of the current users privileges.
 *
 * PARAMS
 *     lpPrivilegeName  [I] Name of the privilege to be changed
 *     bEnable          [I] TRUE: Enables the privilege
 *                          FALSE: Disables the privilege
 *
 * RETURNS
 *     Success: TRUE
 *     Failure: FALSE
 */
BOOL WINAPI EnablePrivilege(LPCWSTR lpPrivilegeName, BOOL bEnable)
{
    TOKEN_PRIVILEGES Privileges;
    HANDLE hToken;
    BOOL bResult;

    TRACE("%s %s\n", debugstr_w(lpPrivilegeName), bEnable ? "TRUE" : "FALSE");

    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken))
        return FALSE;

    Privileges.PrivilegeCount = 1;
    Privileges.Privileges[0].Attributes = (bEnable) ? SE_PRIVILEGE_ENABLED : 0;

    if (!LookupPrivilegeValueW(NULL, lpPrivilegeName,
                               &Privileges.Privileges[0].Luid))
    {
        CloseHandle(hToken);
        return FALSE;
    }

    bResult = AdjustTokenPrivileges(hToken, FALSE, &Privileges, 0, NULL, NULL);

    CloseHandle(hToken);

    return bResult;
}