/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%                                 N   N  TTTTT                                %
%                                 NN  N    T                                  %
%                                 N N N    T                                  %
%                                 N  NN    T                                  %
%                                 N   N    T                                  %
%                                                                             %
%                                                                             %
%                   Windows NT Utility Methods for MagickCore                 %
%                                                                             %
%                               Software Design                               %
%                                    Cristy                                   %
%                                December 1996                                %
%                                                                             %
%                                                                             %
%  Copyright @ 1999 ImageMagick Studio LLC, a non-profit organization         %
%  dedicated to making software imaging solutions freely available.           %
%                                                                             %
%  You may not use this file except in compliance with the License.  You may  %
%  obtain a copy of the License at                                            %
%                                                                             %
%    https://imagemagick.org/script/license.php                               %
%                                                                             %
%  Unless required by applicable law or agreed to in writing, software        %
%  distributed under the License is distributed on an "AS IS" BASIS,          %
%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
%  See the License for the specific language governing permissions and        %
%  limitations under the License.                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
  Include declarations.
*/
#include "MagickCore/studio.h"
#if defined(MAGICKCORE_WINDOWS_SUPPORT)
#include "MagickCore/client.h"
#include "MagickCore/distribute-cache-private.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/image-private.h"
#include "MagickCore/locale_.h"
#include "MagickCore/log.h"
#include "MagickCore/magick.h"
#include "MagickCore/memory_.h"
#include "MagickCore/memory-private.h"
#include "MagickCore/nt-base.h"
#include "MagickCore/nt-base-private.h"
#include "MagickCore/resource_.h"
#include "MagickCore/resource-private.h"
#include "MagickCore/timer.h"
#include "MagickCore/string_.h"
#include "MagickCore/string-private.h"
#include "MagickCore/utility.h"
#include "MagickCore/utility-private.h"
#include "MagickCore/version.h"
#if defined(MAGICKCORE_LTDL_DELEGATE)
#  include "ltdl.h"
#endif
#if defined(MAGICKCORE_CIPHER_SUPPORT)
#include <ntsecapi.h>
#include <wincrypt.h>
#endif

/*
  Define declarations.
*/
#if !defined(MAP_FAILED)
#define MAP_FAILED      ((void *)(LONG_PTR)-1)
#endif
#define MaxWideByteExtent  100

/*
  Typedef declarations.
*/

/*
  We need to make sure only one instance is created for each process and that
  is why we wrap the new/delete instance methods.

  From: http://www.ghostscript.com/doc/current/API.htm
    "The Win32 DLL gsdll32.dll can be used by multiple programs simultaneously,
     but only once within each process"
*/
typedef struct _NTGhostInfo
{
  void
    (MagickDLLCall *delete_instance)(gs_main_instance *);

  int
    (MagickDLLCall *new_instance)(gs_main_instance **,void *);

  MagickBooleanType
    has_instance;
} NTGhostInfo;

/*
  Static declarations.
*/
static NTGhostInfo
  nt_ghost_info;

static GhostInfo
  ghost_info;

static void
  *ghost_handle = (void *) NULL;

static SemaphoreInfo
  *ghost_semaphore = (SemaphoreInfo *) NULL;

struct
{
  const HKEY
    hkey;

  const char
    *name;
}
const registry_roots[2] =
{
  { HKEY_CURRENT_USER,  "HKEY_CURRENT_USER"  },
  { HKEY_LOCAL_MACHINE, "HKEY_LOCAL_MACHINE" }
};

/*
  External declarations.
*/
static void MagickDLLCall NTGhostscriptDeleteInstance(
  gs_main_instance *instance)
{
  LockSemaphoreInfo(ghost_semaphore);
  nt_ghost_info.delete_instance(instance);
  nt_ghost_info.has_instance=MagickFalse;
  UnlockSemaphoreInfo(ghost_semaphore);
}

static int MagickDLLCall NTGhostscriptNewInstance(gs_main_instance **pinstance,
  void *caller_handle)
{
  int
    status;

  LockSemaphoreInfo(ghost_semaphore);
  status=-1;
  if (nt_ghost_info.has_instance == MagickFalse)
    {
      status=nt_ghost_info.new_instance(pinstance,caller_handle);
      if (status >= 0)
        nt_ghost_info.has_instance=MagickTrue;
    }
  UnlockSemaphoreInfo(ghost_semaphore);
  return(status);
}

static inline char *create_utf8_string(const wchar_t *wide)
{
  char
    *utf8;

  int
    count;

  count=WideCharToMultiByte(CP_UTF8,0,wide,-1,NULL,0,NULL,NULL);
  if (count == 0)
    return((char *) NULL);
  utf8=(char *) NTAcquireQuantumMemory(count+1,sizeof(*utf8));
  if (utf8 == (char *) NULL)
    return((char *) NULL);
  count=WideCharToMultiByte(CP_UTF8,0,wide,-1,utf8,count,NULL,NULL);
  if (count == 0)
    {
      utf8=(char *) RelinquishMagickMemory(utf8);
      return((char *) NULL);
    }
  utf8[count]=0;
  return(utf8);
}

static unsigned char *NTGetRegistryValue(HKEY root,const char *key,DWORD flags,
  const char *name)
{
  unsigned char
    *value;

  HKEY
    registry_key;

  DWORD
    size,
    type;

  LSTATUS
    status;

  wchar_t
    wide_name[MaxWideByteExtent];

  value=(unsigned char *) NULL;
  status=RegOpenKeyExA(root,key,0,(KEY_READ | flags),&registry_key);
  if (status != ERROR_SUCCESS)
    return(value);
  if (MultiByteToWideChar(CP_UTF8,0,name,-1,wide_name,MaxWideByteExtent) == 0)
    {
      RegCloseKey(registry_key);
      return(value);
    }
  status=RegQueryValueExW(registry_key,wide_name,0,&type,0,&size);
  if ((status == ERROR_SUCCESS) && (type == REG_SZ))
    {
      LPBYTE
        wide;

      wide=(LPBYTE) NTAcquireQuantumMemory((const size_t) size,sizeof(*wide));
      if (wide != (LPBYTE) NULL)
        {
          status=RegQueryValueExW(registry_key,wide_name,0,&type,wide,&size);
          if ((status == ERROR_SUCCESS) && (type == REG_SZ))
            value=(unsigned char *) create_utf8_string((const wchar_t *) wide);
          wide=(LPBYTE) RelinquishMagickMemory(wide);
        }
    }
  RegCloseKey(registry_key);
  return(value);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   D l l M a i n                                                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  DllMain() is an entry point to the DLL which is called when processes and
%  threads are initialized and terminated, or upon calls to the Windows
%  LoadLibrary and FreeLibrary functions.
%
%  The function returns TRUE of it succeeds, or FALSE if initialization fails.
%
%  The format of the DllMain method is:
%
%    BOOL WINAPI DllMain(HINSTANCE handle,DWORD reason,LPVOID lpvReserved)
%
%  A description of each parameter follows:
%
%    o handle: handle to the DLL module
%
%    o reason: reason for calling function:
%
%      DLL_PROCESS_ATTACH - DLL is being loaded into virtual address
%                           space of current process.
%      DLL_THREAD_ATTACH - Indicates that the current process is
%                          creating a new thread.  Called under the
%                          context of the new thread.
%      DLL_THREAD_DETACH - Indicates that the thread is exiting.
%                          Called under the context of the exiting
%                          thread.
%      DLL_PROCESS_DETACH - Indicates that the DLL is being unloaded
%                           from the virtual address space of the
%                           current process.
%
%    o lpvReserved: Used for passing additional info during DLL_PROCESS_ATTACH
%                   and DLL_PROCESS_DETACH.
%
*/
#if defined(_DLL) && defined(ProvideDllMain)
BOOL WINAPI DllMain(HINSTANCE handle,DWORD reason,LPVOID lpvReserved)
{
  switch (reason)
  {
    case DLL_PROCESS_ATTACH:
    {
      char
        *module_path;

      ssize_t
        count;

      wchar_t
        *wide_path;

      MagickCoreGenesis((const char *) NULL,MagickFalse);
      wide_path=(wchar_t *) NTAcquireQuantumMemory(MagickPathExtent,
        sizeof(*wide_path));
      if (wide_path == (wchar_t *) NULL)
        return(FALSE);
      count=(ssize_t) GetModuleFileNameW(handle,wide_path,MagickPathExtent);
      if (count != 0)
        {
          char
            *path;

          module_path=create_utf8_string(wide_path);
          for ( ; count > 0; count--)
            if (module_path[count] == '\\')
              {
                module_path[count+1]='\0';
                break;
              }
          path=(char *) NTAcquireQuantumMemory(MagickPathExtent,
            16*sizeof(*path));
          if (path == (char *) NULL)
            {
              module_path=DestroyString(module_path);
              wide_path=(wchar_t *) RelinquishMagickMemory(wide_path);
              return(FALSE);
            }
          count=(ssize_t) GetEnvironmentVariable("PATH",path,16*
            MagickPathExtent);
          if ((count != 0) && (strstr(path,module_path) == (char *) NULL))
            {
              if ((strlen(module_path)+count+1) < (16*MagickPathExtent-1))
                {
                  char
                    *variable;

                  variable=(char *) NTAcquireQuantumMemory(MagickPathExtent,
                    16*sizeof(*variable));
                  if (variable == (char *) NULL)
                    {
                      path=DestroyString(path);
                      module_path=DestroyString(module_path);
                      wide_path=(wchar_t *) RelinquishMagickMemory(wide_path);
                      return(FALSE);
                    }
                  (void) FormatLocaleString(variable,16*MagickPathExtent,
                    "%s;%s",module_path,path);
                  SetEnvironmentVariable("PATH",variable);
                  variable=DestroyString(variable);
                }
            }
          path=DestroyString(path);
          module_path=DestroyString(module_path);
        }
      wide_path=(wchar_t *) RelinquishMagickMemory(wide_path);
      break;
    }
    case DLL_PROCESS_DETACH:
    {
      MagickCoreTerminus();
      break;
    }
    default:
      break;
  }
  return(TRUE);
}
#endif

#if !defined(__MINGW32__)
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   g e t t i m e o f d a y                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  The gettimeofday() method get the time of day.
%
%  The format of the gettimeofday method is:
%
%      int gettimeofday(struct timeval *time_value,struct timezone *time_zone)
%
%  A description of each parameter follows:
%
%    o time_value: the time value.
%
%    o time_zone: the time zone.
%
*/
MagickPrivate int gettimeofday (struct timeval *time_value,
  struct timezone *time_zone)
{
#define EpochFiletime  MagickLLConstant(116444736000000000)

  static int
    is_tz_set;

  if (time_value != (struct timeval *) NULL)
    {
      FILETIME
        file_time;

      __int64
        time;

      LARGE_INTEGER
        date_time;

      GetSystemTimeAsFileTime(&file_time);
      date_time.LowPart=file_time.dwLowDateTime;
      date_time.HighPart=file_time.dwHighDateTime;
      time=date_time.QuadPart;
      time-=EpochFiletime;
      time/=10;
      time_value->tv_sec=(ssize_t) (time / 1000000);
      time_value->tv_usec=(ssize_t) (time % 1000000);
    }
  if (time_zone != (struct timezone *) NULL)
    {
      if (is_tz_set == 0)
        {
          _tzset();
          is_tz_set++;
        }
      time_zone->tz_minuteswest=_timezone/60;
      time_zone->tz_dsttime=_daylight;
    }
  return(0);
}
#endif

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T A r g v T o U T F 8                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTArgvToUTF8() converts the wide command line arguments to UTF-8 to ensure
%  compatibility with Linux.
%
%  The format of the NTArgvToUTF8 method is:
%
%      char **NTArgvToUTF8(const int argc,wchar_t **argv)
%
%  A description of each parameter follows:
%
%    o argc: the number of command line arguments.
%
%    o argv:  the  wide-character command line arguments.
%
*/
MagickPrivate char **NTArgvToUTF8(const int argc,wchar_t **argv)
{
  char
    **utf8;

  ssize_t
    i;

  utf8=(char **) NTAcquireQuantumMemory(argc,sizeof(*utf8));
  if (utf8 == (char **) NULL)
    ThrowFatalException(ResourceLimitFatalError,"UnableToConvertStringToARGV");
  for (i=0; i < (ssize_t) argc; i++)
  {
    utf8[i]=create_utf8_string(argv[i]);
    if (utf8[i] == (char *) NULL)
      {
        for (i--; i >= 0; i--)
          utf8[i]=DestroyString(utf8[i]);
        ThrowFatalException(ResourceLimitFatalError,
          "UnableToConvertStringToARGV");
      }
  }
  return(utf8);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T C l o s e D i r e c t o r y                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTCloseDirectory() closes the named directory stream and frees the DIR
%  structure.
%
%  The format of the NTCloseDirectory method is:
%
%      int NTCloseDirectory(DIR *entry)
%
%  A description of each parameter follows:
%
%    o entry: Specifies a pointer to a DIR structure.
%
*/
MagickPrivate int NTCloseDirectory(DIR *entry)
{
  assert(entry != (DIR *) NULL);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  FindClose(entry->hSearch);
  entry=(DIR *) RelinquishMagickMemory(entry);
  return(0);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T C l o s e L i b r a r y                                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTCloseLibrary() unloads the module associated with the passed handle.
%
%  The format of the NTCloseLibrary method is:
%
%      void NTCloseLibrary(void *handle)
%
%  A description of each parameter follows:
%
%    o handle: Specifies a handle to a previously loaded dynamic module.
%
*/
MagickPrivate int NTCloseLibrary(void *handle)
{
  return(!(FreeLibrary((HINSTANCE) handle)));
}


/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T E l a p s e d T i m e                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTElapsedTime() returns the elapsed time (in seconds) since the last call to
%  StartTimer().
%
%  The format of the ElapsedTime method is:
%
%      double NTElapsedTime(void)
%
*/
MagickPrivate double NTElapsedTime(void)
{
  union
  {
    FILETIME
      filetime;

    __int64
      filetime64;
  } elapsed_time;

  LARGE_INTEGER
    performance_count;

  static LARGE_INTEGER
    frequency = { 0 };

  SYSTEMTIME
    system_time;

  if (frequency.QuadPart == 0)
    {
      if (QueryPerformanceFrequency(&frequency) == 0)
        frequency.QuadPart=1;
    }
  if (frequency.QuadPart > 1)
    {
      QueryPerformanceCounter(&performance_count);
      return((double) performance_count.QuadPart/frequency.QuadPart);
    }
  GetSystemTime(&system_time);
  SystemTimeToFileTime(&system_time,&elapsed_time.filetime);
  return((double) 1.0e-7*elapsed_time.filetime64);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T E r f                                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTErf() computes the error function of x.
%
%  The format of the NTErf method is:
%
%      double NTErf(double x)
%
%  A description of each parameter follows:
%
%    o x: The value to compute the error function for.
%
*/
MagickPrivate double NTErf(double x)
{
  double
    a1,
    a2,
    a3,
    a4,
    a5,
    p,
    t,
    y;

  int
    sign;

  a1=0.254829592;
  a2=-0.284496736;
  a3=1.421413741;
  a4=-1.453152027;
  a5=1.061405429;
  p=0.3275911;
  sign=x < 0 ? -1 : 1;
  x=fabs(x);
  t=1.0/(1.0+p*x);
  y=1.0-(((((a5*t+a4)*t)+a3)*t+a2)*t+a1)*t*exp(-x*x);
  return(sign*y);
}


/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
+   N T E r r o r H a n d l e r                                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTErrorHandler() displays an error reason and then terminates the program.
%
%  The format of the NTErrorHandler method is:
%
%      void NTErrorHandler(const ExceptionType severity,const char *reason,
%        const char *description)
%
%  A description of each parameter follows:
%
%    o severity: Specifies the numeric error category.
%
%    o reason: Specifies the reason to display before terminating the
%      program.
%
%    o description: Specifies any description to the reason.
%
*/
MagickPrivate void NTErrorHandler(const ExceptionType severity,
  const char *reason,const char *description)
{
  char
    buffer[3*MagickPathExtent],
    *message;

  (void) severity;
  if (reason == (char *) NULL)
    {
      MagickCoreTerminus();
      exit(0);
    }
  message=GetExceptionMessage(errno);
  if ((description != (char *) NULL) && errno)
    (void) FormatLocaleString(buffer,MagickPathExtent,"%s: %s (%s) [%s].\n",
      GetClientName(),reason,description,message);
  else
    if (description != (char *) NULL)
      (void) FormatLocaleString(buffer,MagickPathExtent,"%s: %s (%s).\n",
        GetClientName(),reason,description);
    else
      if (errno != 0)
        (void) FormatLocaleString(buffer,MagickPathExtent,"%s: %s [%s].\n",
          GetClientName(),reason,message);
      else
        (void) FormatLocaleString(buffer,MagickPathExtent,"%s: %s.\n",
          GetClientName(),reason);
  message=DestroyString(message);
  (void) MessageBox(NULL,buffer,"ImageMagick Exception",MB_OK | MB_TASKMODAL |
    MB_SETFOREGROUND | MB_ICONEXCLAMATION);
  MagickCoreTerminus();
  exit(0);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G a t h e r R a n d o m D a t a                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGatherRandomData() gathers random data and returns it.
%
%  The format of the GatherRandomData method is:
%
%      MagickBooleanType NTGatherRandomData(const size_t length,
%        unsigned char *random)
%
%  A description of each parameter follows:
%
%    length: the length of random data buffer
%
%    random: the random data is returned here.
%
*/
MagickPrivate MagickBooleanType NTGatherRandomData(const size_t length,
  unsigned char *random)
{
#if defined(MAGICKCORE_CIPHER_SUPPORT) && defined(_MSC_VER)
  HCRYPTPROV
    handle;

  int
    status;

  handle=(HCRYPTPROV) NULL;
  status=CryptAcquireContext(&handle,NULL,MS_DEF_PROV,PROV_RSA_FULL,
    (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET));
  if (status == 0)
    status=CryptAcquireContext(&handle,NULL,MS_DEF_PROV,PROV_RSA_FULL,
      (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET));
  if (status == 0)
    return(MagickFalse);
  status=CryptGenRandom(handle,(DWORD) length,random);
  if (status == 0)
    {
      status=CryptReleaseContext(handle,0);
      return(MagickFalse);
    }
  status=CryptReleaseContext(handle,0);
  if (status == 0)
    return(MagickFalse);
#else
  (void) random;
  (void) length;
#endif
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G e t E n v i r o n m e n t V a l u e                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGetEnvironmentValue() returns the environment string that matches the
%  specified name.
%
%  The format of the NTGetEnvironmentValue method is:
%
%      char *GetEnvironmentValue(const char *name)
%
%  A description of each parameter follows:
%
%    o name: the environment name.
%
*/
extern MagickPrivate char *NTGetEnvironmentValue(const char *name)
{
  char
    *environment = (char *) NULL;

  DWORD
    size;

  LPWSTR
    wide;

  wchar_t
    wide_name[MaxWideByteExtent];

  if (MultiByteToWideChar(CP_UTF8,0,name,-1,wide_name,MaxWideByteExtent) == 0)
    return(environment);
  size=GetEnvironmentVariableW(wide_name,(LPWSTR) NULL,0);
  if (size == 0)
    return(environment);
  wide=(LPWSTR) NTAcquireQuantumMemory((const size_t) size,sizeof(*wide));
  if (wide == (LPWSTR) NULL)
    return(environment);
  if (GetEnvironmentVariableW(wide_name,wide,size) != 0)
    environment=create_utf8_string(wide);
  wide=(LPWSTR) RelinquishMagickMemory(wide);
  return(environment);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G e t E x e c u t i o n P a t h                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGetExecutionPath() returns the execution path of a program.
%
%  The format of the GetExecutionPath method is:
%
%      MagickBooleanType NTGetExecutionPath(char *path,const size_t extent)
%
%  A description of each parameter follows:
%
%    o path: the pathname of the executable that started the process.
%
%    o extent: the maximum extent of the path.
%
*/
MagickPrivate MagickBooleanType NTGetExecutionPath(char *path,
  const size_t extent)
{
  wchar_t
    wide_path[MagickPathExtent];

  (void) GetModuleFileNameW((HMODULE) NULL,wide_path,(DWORD) extent);
  (void) WideCharToMultiByte(CP_UTF8,0,wide_path,-1,path,(int) extent,NULL,
    NULL);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G e t L a s t E r r o r M e s s a g e                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGetLastErrorMessage() returns the last error that occurred.
%
%  The format of the NTGetLastErrorMessage method is:
%
%      char *NTGetLastErrorMessage(DWORD last_error)
%
%  A description of each parameter follows:
%
%    o last_error: The value of GetLastError.
%
*/
static char *NTGetLastErrorMessage(DWORD last_error)
{
  char
    *reason;

  int
    status;

  LPVOID
    buffer = (LPVOID) NULL;

  status=FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
    FORMAT_MESSAGE_FROM_SYSTEM,NULL,last_error,
    MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),(LPTSTR) &buffer,0,NULL);
  if (!status)
    reason=AcquireString("An unknown error occurred");
  else
    {
      reason=AcquireString((const char *) buffer);
      LocalFree(buffer);
    }
  return(reason);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G e t L i b r a r y E r r o r                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Lt_dlerror() returns a pointer to a string describing the last error
%  associated with a lt_dl method.  Note that this function is not thread
%  safe so it should only be used under the protection of a lock.
%
%  The format of the NTGetLibraryError method is:
%
%      const char *NTGetLibraryError(void)
%
*/
MagickPrivate const char *NTGetLibraryError(void)
{
  static char
    last_error[MagickPathExtent];

  char
    *error;

  *last_error='\0';
  error=NTGetLastErrorMessage(GetLastError());
  if (error)
    (void) CopyMagickString(last_error,error,MagickPathExtent);
  error=DestroyString(error);
  return(last_error);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G e t L i b r a r y S y m b o l                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGetLibrarySymbol() retrieve the procedure address of the method
%  specified by the passed character string.
%
%  The format of the NTGetLibrarySymbol method is:
%
%      void *NTGetLibrarySymbol(void *handle,const char *name)
%
%  A description of each parameter follows:
%
%    o handle: Specifies a handle to the previously loaded dynamic module.
%
%    o name: Specifies the procedure entry point to be returned.
%
*/
void *NTGetLibrarySymbol(void *handle,const char *name)
{
  FARPROC
    proc_address;

  proc_address=GetProcAddress((HMODULE) handle,(LPCSTR) name);
  if (proc_address == (FARPROC) NULL)
    return((void *) NULL);
  return((void *) proc_address);
}


/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G e t M o d u l e P a t h                                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGetModulePath() returns the path of the specified module.
%
%  The format of the GetModulePath method is:
%
%      MagickBooleanType NTGetModulePath(const char *module,char *path)
%
%  A description of each parameter follows:
%
%    modith: the module name.
%
%    path: the module path is returned here.
%
*/
MagickPrivate MagickBooleanType NTGetModulePath(const char *module,char *path)
{
  char
    module_path[MagickPathExtent];

  HMODULE
    handle;

  ssize_t
    length;

  *path='\0';
  handle=GetModuleHandle(module);
  if (handle == (HMODULE) NULL)
    return(MagickFalse);
  length=GetModuleFileName(handle,module_path,MagickPathExtent);
  if (length != 0)
    GetPathComponent(module_path,HeadPath,path);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G h o s t s c r i p t D L L V e c t o r s                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGhostscriptDLLVectors() returns a GhostInfo structure that includes
%  function vectors to invoke Ghostscript DLL functions. A null pointer is
%  returned if there is an error when loading the DLL or retrieving the
%  function vectors.
%
%  The format of the NTGhostscriptDLLVectors method is:
%
%      const GhostInfo *NTGhostscriptDLLVectors(void)
%
*/
static int NTLocateGhostscript(DWORD flags,int *root_index,
  const char **product_family,int *major_version,int *minor_version,
  int *patch_version)
{
  int
    i;

  MagickBooleanType
    status;

  static const char
    *products[2] =
    {
      "Artifex Ghostscript",
      "GPL Ghostscript"
    };

  /*
    Find the most recent version of Ghostscript.
  */
  status=MagickFalse;
  *root_index=0;
  *product_family=NULL;
  *major_version=5;
  *minor_version=49; /* min version of Ghostscript is 5.50 */
  for (i=0; i < (ssize_t) (sizeof(products)/sizeof(products[0])); i++)
  {
    char
      key[MagickPathExtent];

    HKEY
      hkey;

    int
      j;

    REGSAM
      mode;

    (void) FormatLocaleString(key,MagickPathExtent,"SOFTWARE\\%s",products[i]);
    for (j=0; j < (ssize_t) (sizeof(registry_roots)/sizeof(registry_roots[0]));
         j++)
    {
      mode=KEY_READ | flags;
      if (RegOpenKeyExA(registry_roots[j].hkey,key,0,mode,&hkey) ==
            ERROR_SUCCESS)
        {
          DWORD
            extent;

          int
            k;

          /*
            Now enumerate the keys.
          */
          extent=sizeof(key)/sizeof(char);
          for (k=0; RegEnumKeyA(hkey,k,key,extent) == ERROR_SUCCESS; k++)
          {
            int
              major,
              minor,
              patch;

            major=0;
            minor=0;
            patch=0;
            if (sscanf(key,"%d.%d.%d",&major,&minor,&patch) != 3)
              if (sscanf(key,"%d.%d",&major,&minor) != 2)
                continue;
            if ((major > *major_version) ||
               ((major == *major_version) && (minor > *minor_version)) ||
               ((minor == *minor_version) && (patch > *patch_version)))
              {
                *root_index=j;
                *product_family=products[i];
                *major_version=major;
                *minor_version=minor;
                *patch_version=patch;
                status=MagickTrue;
              }
         }
         (void) RegCloseKey(hkey);
       }
    }
  }
  if (status == MagickFalse)
    {
      *major_version=0;
      *minor_version=0;
      *patch_version=0;
    }
  (void) LogMagickEvent(ConfigureEvent,GetMagickModule(),"Ghostscript (%s) "
    "version %d.%d.%d",*product_family,*major_version,*minor_version,*patch_version);
  return(status);
}

static MagickBooleanType NTGhostscriptGetString(const char *name,
  BOOL *is_64_bit,char *value,const size_t length)
{
  char
    buffer[MagickPathExtent],
    *directory;

  static const char
    *product_family = (const char *) NULL;

  static BOOL
    is_64_bit_version = FALSE;

  static int
    flags = 0,
    major_version = 0,
    minor_version = 0,
    patch_version = 0,
    root_index = 0;

  unsigned char
    *registry_value;

  /*
    Get a string from the installed Ghostscript.
  */
  *value='\0';
  directory=(char *) NULL;
  if (LocaleCompare(name,"GS_DLL") == 0)
    {
      directory=GetEnvironmentValue("MAGICK_GHOSTSCRIPT_PATH");
      if (directory != (char *) NULL)
        {
          (void) FormatLocaleString(buffer,MagickPathExtent,"%s%sgsdll64.dll",
            directory,DirectorySeparator);
          if (IsPathAccessible(buffer) != MagickFalse)
            {
              directory=DestroyString(directory);
              (void) CopyMagickString(value,buffer,length);
              if (is_64_bit != NULL)
                *is_64_bit=TRUE;
              return(MagickTrue);
            }
          (void) FormatLocaleString(buffer,MagickPathExtent,"%s%sgsdll32.dll",
            directory,DirectorySeparator);
          if (IsPathAccessible(buffer) != MagickFalse)
            {
              directory=DestroyString(directory);
              (void) CopyMagickString(value,buffer,length);
              if (is_64_bit != NULL)
                *is_64_bit=FALSE;
              return(MagickTrue);
            }
          return(MagickFalse);
        }
    }
  if (product_family == (const char *) NULL)
    {
      flags=0;
#if defined(KEY_WOW64_32KEY)
#if defined(_WIN64)
      flags=KEY_WOW64_64KEY;
#else
      flags=KEY_WOW64_32KEY;
#endif
      (void) NTLocateGhostscript(flags,&root_index,&product_family,
        &major_version,&minor_version,&patch_version);
      if (product_family == (const char *) NULL)
#if defined(_WIN64)
        flags=KEY_WOW64_32KEY;
      else
        is_64_bit_version=TRUE;
#else
      flags=KEY_WOW64_64KEY;
#endif
#endif
    }
  if (product_family == (const char *) NULL)
    {
      (void) NTLocateGhostscript(flags,&root_index,&product_family,
        &major_version,&minor_version,&patch_version);
#if !defined(_WIN64)
      is_64_bit_version=TRUE;
#endif
    }
  if (product_family == (const char *) NULL)
    return(MagickFalse);
  if (is_64_bit != NULL)
    *is_64_bit=is_64_bit_version;
  (void) FormatLocaleString(buffer,MagickPathExtent,"SOFTWARE\\%s\\%d.%.2d.%d",
    product_family,major_version,minor_version,patch_version);
  registry_value=NTGetRegistryValue(registry_roots[root_index].hkey,buffer,
    flags,name);
  if (registry_value == (unsigned char *) NULL)
    {
      (void) FormatLocaleString(buffer,MagickPathExtent,"SOFTWARE\\%s\\%d.%02d",
        product_family,major_version,minor_version);
      registry_value=NTGetRegistryValue(registry_roots[root_index].hkey,buffer,
        flags,name);
    }
  if (registry_value == (unsigned char *) NULL)
    return(MagickFalse);
  (void) CopyMagickString(value,(const char *) registry_value,length);
  registry_value=(unsigned char *) RelinquishMagickMemory(registry_value);
  (void) LogMagickEvent(ConfigureEvent,GetMagickModule(),
    "registry: \"%s\\%s\\%s\"=\"%s\"",registry_roots[root_index].name,
    buffer,name,value);
  return(MagickTrue);
}

static MagickBooleanType NTGhostscriptDLL(char *path,int length)
{
  static char
    dll[MagickPathExtent] = { "" };

  static BOOL
    is_64_bit;

  *path='\0';
  if ((*dll == '\0') &&
      (NTGhostscriptGetString("GS_DLL",&is_64_bit,dll,sizeof(dll)) != MagickTrue))
    return(MagickFalse);
#if defined(_WIN64)
  if (!is_64_bit)
    return(MagickFalse);
#else
  if (is_64_bit)
    return(MagickFalse);
#endif
  (void) CopyMagickString(path,dll,length);
  return(MagickTrue);
}

static inline MagickBooleanType NTGhostscriptHasValidHandle()
{
  if ((nt_ghost_info.delete_instance == NULL) || (ghost_info.exit == NULL) ||
      (nt_ghost_info.new_instance == NULL) || (ghost_info.set_stdio == NULL) ||
      (ghost_info.init_with_args == NULL) || (ghost_info.revision == NULL))
    return(MagickFalse);
  return(MagickTrue);
}

MagickPrivate const GhostInfo *NTGhostscriptDLLVectors(void)
{
  char
    path[MagickPathExtent];

  if (ghost_semaphore == (SemaphoreInfo *) NULL)
    ActivateSemaphoreInfo(&ghost_semaphore);
  LockSemaphoreInfo(ghost_semaphore);
  if (ghost_handle != (void *) NULL)
    {
      UnlockSemaphoreInfo(ghost_semaphore);
      if (NTGhostscriptHasValidHandle() == MagickTrue)
        return(&ghost_info);
      return((GhostInfo *) NULL);
    }
  if (NTGhostscriptDLL(path,sizeof(path)) != MagickTrue)
    {
      UnlockSemaphoreInfo(ghost_semaphore);
      return((GhostInfo *) NULL);
    }
  ghost_handle=lt_dlopen(path);
  if (ghost_handle == (void *) NULL)
    {
      UnlockSemaphoreInfo(ghost_semaphore);
      return((GhostInfo *) NULL);
    }
  (void) memset((void *) &nt_ghost_info,0,sizeof(NTGhostInfo));
  nt_ghost_info.delete_instance=(void (MagickDLLCall *)(gs_main_instance *)) (
    lt_dlsym(ghost_handle,"gsapi_delete_instance"));
  nt_ghost_info.new_instance=(int (MagickDLLCall *)(gs_main_instance **,
    void *)) (lt_dlsym(ghost_handle,"gsapi_new_instance"));
  nt_ghost_info.has_instance=MagickFalse;
  (void) memset((void *) &ghost_info,0,sizeof(GhostInfo));
  ghost_info.delete_instance=NTGhostscriptDeleteInstance;
  ghost_info.exit=(int (MagickDLLCall *)(gs_main_instance*))
    lt_dlsym(ghost_handle,"gsapi_exit");
  ghost_info.init_with_args=(int (MagickDLLCall *)(gs_main_instance *,int,
    char **)) (lt_dlsym(ghost_handle,"gsapi_init_with_args"));
  ghost_info.new_instance=NTGhostscriptNewInstance;
  ghost_info.run_string=(int (MagickDLLCall *)(gs_main_instance *,const char *,
    int,int *)) (lt_dlsym(ghost_handle,"gsapi_run_string"));
  ghost_info.set_arg_encoding=(int (MagickDLLCall*)(gs_main_instance*, int)) (
    lt_dlsym(ghost_handle, "gsapi_set_arg_encoding"));
  ghost_info.set_stdio=(int (MagickDLLCall *)(gs_main_instance *,int(
    MagickDLLCall *)(void *,char *,int),int(MagickDLLCall *)(void *,
    const char *,int),int(MagickDLLCall *)(void *,const char *,int)))
    (lt_dlsym(ghost_handle,"gsapi_set_stdio"));
  ghost_info.revision=(int (MagickDLLCall *)(gsapi_revision_t *,int)) (
    lt_dlsym(ghost_handle,"gsapi_revision"));
  UnlockSemaphoreInfo(ghost_semaphore);
  if (NTGhostscriptHasValidHandle() == MagickTrue)
    return(&ghost_info);
  return((GhostInfo *) NULL);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G h o s t s c r i p t E X E                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGhostscriptEXE() obtains the path to the latest Ghostscript executable.
%  The method returns FALSE if a full path value is not obtained and returns
%  a default path of gswin32c.exe.
%
%  The format of the NTGhostscriptEXE method is:
%
%      void NTGhostscriptEXE(char *path,int length)
%
%  A description of each parameter follows:
%
%    o path: return the Ghostscript executable path here.
%
%    o length: length of buffer.
%
*/
MagickPrivate void NTGhostscriptEXE(char *path,int length)
{
  char
    *p;

  static char
    program[MagickPathExtent] = { "" };

  static BOOL
    is_64_bit_version = FALSE;

  if (*program == '\0')
    {
      if (ghost_semaphore == (SemaphoreInfo *) NULL)
        ActivateSemaphoreInfo(&ghost_semaphore);
      LockSemaphoreInfo(ghost_semaphore);
      if (*program == '\0')
        {
          if (NTGhostscriptGetString("GS_DLL",&is_64_bit_version,program,
                sizeof(program)) == MagickFalse)
            {
              UnlockSemaphoreInfo(ghost_semaphore);
#if defined(_WIN64)
              (void) CopyMagickString(program,"gswin64c.exe",sizeof(program));
#else
              (void) CopyMagickString(program,"gswin32c.exe",sizeof(program));
#endif
              (void) CopyMagickString(path,program,length);
              return;
            }
          p=strrchr(program,'\\');
          if (p != (char *) NULL)
            {
              p++;
              *p='\0';
              (void) ConcatenateMagickString(program,is_64_bit_version ?
                "gswin64c.exe" : "gswin32c.exe",sizeof(program));
            }
        }
      UnlockSemaphoreInfo(ghost_semaphore);
    }
  (void) CopyMagickString(path,program,length);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G h o s t s c r i p t F o n t s                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGhostscriptFonts() obtains the path to the Ghostscript fonts.  The method
%  returns false if it cannot determine the font path.
%
%  The format of the NTGhostscriptFonts method is:
%
%      MagickBooleanType NTGhostscriptFonts(char *path,int length)
%
%  A description of each parameter follows:
%
%    o path: return the font path here.
%
%    o length: length of the path buffer.
%
*/
MagickPrivate MagickBooleanType NTGhostscriptFonts(char *path,int length)
{
  char
    buffer[MagickPathExtent],
    *directory,
    filename[MagickPathExtent];

  char
    *p,
    *q;

  *path='\0';
  directory=GetEnvironmentValue("MAGICK_GHOSTSCRIPT_FONT_PATH");
  if (directory != (char *) NULL)
    {
      (void) CopyMagickString(buffer,directory,MagickPathExtent);
      directory=DestroyString(directory);
    }
  else
    {
      if (NTGhostscriptGetString("GS_LIB",NULL,buffer,
            MagickPathExtent) == MagickFalse)
        return(MagickFalse);
    }
  for (p=buffer-1; p != (char *) NULL; p=strchr(p+1,DirectoryListSeparator))
  {
    (void) CopyMagickString(path,p+1,length+1);
    q=strchr(path,DirectoryListSeparator);
    if (q != (char *) NULL)
      *q='\0';
    (void) FormatLocaleString(filename,MagickPathExtent,"%s%sfonts.dir",path,
      DirectorySeparator);
    if (IsPathAccessible(filename) != MagickFalse)
      return(MagickTrue);
    (void) FormatLocaleString(filename,MagickPathExtent,"%s%sn019003l.pfb",path,
      DirectorySeparator);
    if (IsPathAccessible(filename) != MagickFalse)
      return(MagickTrue);
  }
  *path='\0';
  return(MagickFalse);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T G h o s t s c r i p t U n L o a d D L L                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTGhostscriptUnLoadDLL() unloads the Ghostscript DLL and returns TRUE if
%  it succeeds.
%
%  The format of the NTGhostscriptUnLoadDLL method is:
%
%      int NTGhostscriptUnLoadDLL(void)
%
*/
MagickPrivate void NTGhostscriptUnLoadDLL(void)
{
  if (ghost_semaphore == (SemaphoreInfo *) NULL)
    ActivateSemaphoreInfo(&ghost_semaphore);
  LockSemaphoreInfo(ghost_semaphore);
  if (ghost_handle != (void *) NULL)
    {
      (void) lt_dlclose(ghost_handle);
      ghost_handle=(void *) NULL;
      (void) memset((void *) &ghost_info,0,sizeof(GhostInfo));
    }
  UnlockSemaphoreInfo(ghost_semaphore);
  RelinquishSemaphoreInfo(&ghost_semaphore);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T L o n g P a t h s E n a b l e d                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTLongPathsEnabled() returns a boolean indicating whether long paths are
$  enabled.
%
%  The format of the NTLongPathsEnabled method is:
%
%      MagickBooleanType NTLongPathsEnabled()
%
*/
MagickExport MagickBooleanType NTLongPathsEnabled()
{
  static size_t
    long_paths_enabled = 2;

  if (long_paths_enabled == 2)
    {
      DWORD
        size,
        type,
        value;

      HKEY
        registry_key;

      LONG
        status;

      registry_key=(HKEY) INVALID_HANDLE_VALUE;
      status=RegOpenKeyExA(HKEY_LOCAL_MACHINE,
        "SYSTEM\\CurrentControlSet\\Control\\FileSystem",0,KEY_READ,
        &registry_key);
      if (status != ERROR_SUCCESS)
        {
          RegCloseKey(registry_key);
          long_paths_enabled=0;
          return(MagickFalse);
        }
      value=0;
      status=RegQueryValueExA(registry_key,"LongPathsEnabled",0,&type,NULL,
        NULL);
      if ((status != ERROR_SUCCESS) || (type != REG_DWORD))
        {
          RegCloseKey(registry_key);
          long_paths_enabled=0;
          return(MagickFalse);
        }
      size=0;
      status=RegQueryValueExA(registry_key,"LongPathsEnabled",0,&type,
        (LPBYTE) &value,&size);
      RegCloseKey(registry_key);
      if (status != ERROR_SUCCESS)
        {
          long_paths_enabled=0;
          return(MagickFalse);
        }
      long_paths_enabled=(size_t) value;
    }
  return(long_paths_enabled == 1 ? MagickTrue : MagickFalse);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
+  N T M a p M e m o r y                                                      %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Mmap() emulates the Unix method of the same name.
%
%  The format of the NTMapMemory method is:
%
%    MagickPrivate void *NTMapMemory(char *address,size_t length,int protection,
%      int access,int file,MagickOffsetType offset)
%
*/
MagickPrivate void *NTMapMemory(char *address,size_t length,int protection,
  int flags,int file,MagickOffsetType offset)
{
  DWORD
    access_mode,
    high_length,
    high_offset,
    low_length,
    low_offset,
    protection_mode;

  HANDLE
    file_handle,
    map_handle;

  void
    *map;

  (void) address;
  access_mode=0;
  file_handle=INVALID_HANDLE_VALUE;
  low_length=(DWORD) (length & 0xFFFFFFFFUL);
  high_length=(DWORD) ((((MagickOffsetType) length) >> 32) & 0xFFFFFFFFUL);
  map_handle=INVALID_HANDLE_VALUE;
  map=(void *) NULL;
  low_offset=(DWORD) (offset & 0xFFFFFFFFUL);
  high_offset=(DWORD) ((offset >> 32) & 0xFFFFFFFFUL);
  protection_mode=0;
  if (protection & PROT_WRITE)
    {
      access_mode=FILE_MAP_WRITE;
      if (!(flags & MAP_PRIVATE))
        protection_mode=PAGE_READWRITE;
      else
        {
          access_mode=FILE_MAP_COPY;
          protection_mode=PAGE_WRITECOPY;
        }
    }
  else
    if (protection & PROT_READ)
      {
        access_mode=FILE_MAP_READ;
        protection_mode=PAGE_READONLY;
      }
  if ((file == -1) && (flags & MAP_ANONYMOUS))
    file_handle=INVALID_HANDLE_VALUE;
  else
    file_handle=(HANDLE) _get_osfhandle(file);
  map_handle=CreateFileMapping(file_handle,0,protection_mode,high_length,
    low_length,0);
  if (map_handle)
    {
      map=(void *) MapViewOfFile(map_handle,access_mode,high_offset,low_offset,
        length);
      CloseHandle(map_handle);
    }
  if (map == (void *) NULL)
    return((void *) ((char *) MAP_FAILED));
  return((void *) ((char *) map));
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T O p e n D i r e c t o r y                                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTOpenDirectory() opens the directory named by filename and associates a
%  directory stream with it.
%
%  The format of the NTOpenDirectory method is:
%
%      DIR *NTOpenDirectory(const char *path)
%
%  A description of each parameter follows:
%
%    o entry: Specifies a pointer to a DIR structure.
%
*/
MagickPrivate DIR *NTOpenDirectory(const char *path)
{
  DIR
    *entry;

  size_t
    length;

  wchar_t
    file_specification[MagickPathExtent];

  assert(path != (const char *) NULL);
  length=MultiByteToWideChar(CP_UTF8,0,path,-1,file_specification,
    MagickPathExtent);
  if (length == 0)
    return((DIR *) NULL);
  if(wcsncat(file_specification,L"\\*.*",MagickPathExtent-wcslen(
      file_specification)-1) == (wchar_t *) NULL)
    return((DIR *) NULL);
  entry=(DIR *) AcquireCriticalMemory(sizeof(DIR));
  entry->firsttime=TRUE;
  entry->hSearch=FindFirstFileW(file_specification,&entry->Win32FindData);
  if (entry->hSearch == INVALID_HANDLE_VALUE)
    {
      entry=(DIR *) RelinquishMagickMemory(entry);
      return((DIR *) NULL);
    }
  return(entry);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T O p e n L i b r a r y                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTOpenLibrary() loads a dynamic module into memory and returns a handle that
%  can be used to access the various procedures in the module.
%
%  The format of the NTOpenLibrary method is:
%
%      void *NTOpenLibrary(const char *filename)
%
%  A description of each parameter follows:
%
%    o path: Specifies a pointer to string representing dynamic module that
%      is to be loaded.
%
*/

static UINT ChangeErrorMode(void)
{
  typedef UINT
    (CALLBACK *GETERRORMODE)(void);

  GETERRORMODE
    getErrorMode;

  HMODULE
    handle;

  UINT
    mode;

  mode=SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX;

  handle=GetModuleHandle("kernel32.dll");
  if (handle == (HMODULE) NULL)
    return SetErrorMode(mode);

  getErrorMode=(GETERRORMODE) NTGetLibrarySymbol(handle,"GetErrorMode");
  if (getErrorMode != (GETERRORMODE) NULL)
    mode=getErrorMode() | SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX;

  return SetErrorMode(mode);
}

static inline void *NTLoadLibrary(const char *filename)
{
  void
    *library;

  wchar_t
    *path;

  library=(void *) NULL;
  path=create_wchar_path(filename);
  if (path != (wchar_t *) NULL)
    {
      library=LoadLibraryExW(path,NULL,LOAD_WITH_ALTERED_SEARCH_PATH);
      path=(wchar_t *) RelinquishMagickMemory(path);
    }
  return(library);
}

MagickPrivate void *NTOpenLibrary(const char *filename)
{
  UINT
    mode;

  void
    *handle;

  mode=ChangeErrorMode();
  handle=NTLoadLibrary(filename);
#if defined(MAGICKCORE_LTDL_DELEGATE)
  if (handle == (void *) NULL)
    {
      char
        path[MagickPathExtent];

      const char
        *p,
        *q;

      p=lt_dlgetsearchpath();
      while (p != (const char*) NULL)
      {
        q=strchr(p,DirectoryListSeparator);
        if (q != (const char*) NULL)
          (void) CopyMagickString(path,p,q-p+1);
        else
          (void) CopyMagickString(path,p,MagickPathExtent);
        (void) ConcatenateMagickString(path,DirectorySeparator,MagickPathExtent);
        (void) ConcatenateMagickString(path,filename,MagickPathExtent);
        handle=NTLoadLibrary(path);
        if (handle != (void *) NULL || q == (const char*) NULL)
          break;
        p=q+1;
      }
    }
#endif
  SetErrorMode(mode);
  return(handle);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%    N T R e a d D i r e c t o r y                                            %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTReadDirectory() returns a pointer to a structure representing the
%  directory entry at the current position in the directory stream to which
%  entry refers.
%
%  The format of the NTReadDirectory
%
%      NTReadDirectory(entry)
%
%  A description of each parameter follows:
%
%    o entry: Specifies a pointer to a DIR structure.
%
*/
MagickPrivate struct dirent *NTReadDirectory(DIR *entry)
{
  int
    status;

  size_t
    length;

  if (entry == (DIR *) NULL)
    return((struct dirent *) NULL);
  if (!entry->firsttime)
    {
      status=FindNextFileW(entry->hSearch,&entry->Win32FindData);
      if (status == 0)
        return((struct dirent *) NULL);
    }
  length=WideCharToMultiByte(CP_UTF8,0,entry->Win32FindData.cFileName,-1,
    entry->file_info.d_name,sizeof(entry->file_info.d_name),NULL,NULL);
  if (length == 0)
    return((struct dirent *) NULL);
  entry->firsttime=FALSE;
  entry->file_info.d_namlen=(int) strlen(entry->file_info.d_name);
  return(&entry->file_info);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T R e g i s t r y K e y L o o k u p                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTRegistryKeyLookup() returns ImageMagick installation path settings
%  stored in the Windows Registry.  Path settings are specific to the
%  installed ImageMagick version so that multiple Image Magick installations
%  may coexist.
%
%  Values are stored in the registry under a base path similar to
%  "HKEY_LOCAL_MACHINE/SOFTWARE\ImageMagick\6.7.4\Q:16" or
%  "HKEY_CURRENT_USER/SOFTWARE\ImageMagick\6.7.4\Q:16". The provided subkey
%  is appended to this base path to form the full key.
%
%  The format of the NTRegistryKeyLookup method is:
%
%      unsigned char *NTRegistryKeyLookup(const char *subkey)
%
%  A description of each parameter follows:
%
%    o subkey: Specifies a string that identifies the registry object.
%      Currently supported sub-keys include: "BinPath", "ConfigurePath",
%      "LibPath", "CoderModulesPath", "FilterModulesPath", "SharePath".
%
*/
MagickPrivate unsigned char *NTRegistryKeyLookup(const char *subkey)
{
  char
    package_key[MagickPathExtent] = "";

  unsigned char
    *value;

  (void) FormatLocaleString(package_key,MagickPathExtent,
    "SOFTWARE\\%s\\%s\\Q:%d",MagickPackageName,MagickLibVersionText,
    MAGICKCORE_QUANTUM_DEPTH);
  value=NTGetRegistryValue(HKEY_LOCAL_MACHINE,package_key,0,subkey);
  if (value == (unsigned char *) NULL)
    value=NTGetRegistryValue(HKEY_CURRENT_USER,package_key,0,subkey);
  return(value);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T R e p o r t E v e n t                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTReportEvent() reports an event.
%
%  The format of the NTReportEvent method is:
%
%      MagickBooleanType NTReportEvent(const char *event,
%        const MagickBooleanType error)
%
%  A description of each parameter follows:
%
%    o event: the event.
%
%    o error: MagickTrue the event is an error.
%
*/
MagickPrivate MagickBooleanType NTReportEvent(const char *event,
  const MagickBooleanType error)
{
  const char
    *events[1];

  HANDLE
    handle;

  WORD
    type;

  handle=RegisterEventSource(NULL,MAGICKCORE_PACKAGE_NAME);
  if (handle == NULL)
    return(MagickFalse);
  events[0]=event;
  type=error ? EVENTLOG_ERROR_TYPE : EVENTLOG_WARNING_TYPE;
  ReportEvent(handle,type,0,0,NULL,1,0,events,NULL);
  DeregisterEventSource(handle);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T R e s o u r c e T o B l o b                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTResourceToBlob() returns a blob containing the contents of the resource
%  in the current executable specified by the id parameter. This currently
%  used to retrieve MGK files tha have been embedded into the various command
%  line utilities.
%
%  The format of the NTResourceToBlob method is:
%
%      unsigned char *NTResourceToBlob(const char *id)
%
%  A description of each parameter follows:
%
%    o id: Specifies a string that identifies the resource.
%
*/
MagickPrivate unsigned char *NTResourceToBlob(const char *id)
{

#ifndef MAGICKCORE_LIBRARY_NAME
  char
    path[MagickPathExtent];
#endif

  DWORD
    length;

  HGLOBAL
    global;

  HMODULE
    handle;

  HRSRC
    resource;

  unsigned char
    *blob,
    *value;

  assert(id != (const char *) NULL);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",id);
#ifdef MAGICKCORE_LIBRARY_NAME
  handle=GetModuleHandle(MAGICKCORE_LIBRARY_NAME);
#else
  (void) FormatLocaleString(path,MagickPathExtent,"%s%s%s",GetClientPath(),
    DirectorySeparator,GetClientName());
  if (IsPathAccessible(path) != MagickFalse)
    handle=GetModuleHandle(path);
  else
    handle=GetModuleHandle(0);
#endif
  if (!handle)
    return((unsigned char *) NULL);
  resource=FindResource(handle,id,"IMAGEMAGICK");
  if (!resource)
    return((unsigned char *) NULL);
  global=LoadResource(handle,resource);
  if (!global)
    return((unsigned char *) NULL);
  length=SizeofResource(handle,resource);
  value=(unsigned char *) LockResource(global);
  if (!value)
    {
      FreeResource(global);
      return((unsigned char *) NULL);
    }
  blob=(unsigned char *) AcquireQuantumMemory(length+MagickPathExtent,
    sizeof(*blob));
  if (blob != (unsigned char *) NULL)
    {
      (void) memcpy(blob,value,length);
      blob[length]='\0';
    }
  UnlockResource(global);
  FreeResource(global);
  return(blob);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T S y s t e m C o m m a n d                                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTSystemCommand() executes the specified command and waits until it
%  terminates.  The returned value is the exit status of the command.
%
%  The format of the NTSystemCommand method is:
%
%      int NTSystemCommand(MagickFalse,const char *command)
%
%  A description of each parameter follows:
%
%    o command: This string is the command to execute.
%
%    o output: an optional buffer to store the output from stderr/stdout.
%
*/
MagickPrivate int NTSystemCommand(const char *command,char *output)
{
#define CleanupOutputHandles \
  if (read_output != (HANDLE) NULL) \
    { \
       CloseHandle(read_output); \
       read_output=(HANDLE) NULL; \
       CloseHandle(write_output); \
       write_output=(HANDLE) NULL; \
    }

#define CopyLastError \
  last_error=GetLastError(); \
  if (output != (char *) NULL) \
    { \
      error=NTGetLastErrorMessage(last_error); \
      if (error != (char *) NULL) \
        { \
          CopyMagickString(output,error,MagickPathExtent); \
          error=DestroyString(error); \
        } \
    }

  char
    *error,
    local_command[MagickPathExtent];

  DWORD
    child_status,
    last_error;

  int
    status;

  MagickBooleanType
    asynchronous;

  HANDLE
    read_output,
    write_output;

  PROCESS_INFORMATION
    process_info;

  size_t
    output_offset;

  STARTUPINFO
    startup_info;

  if (command == (char *) NULL)
    return(-1);
  read_output=(HANDLE) NULL;
  write_output=(HANDLE) NULL;
  GetStartupInfo(&startup_info);
  startup_info.dwFlags=STARTF_USESHOWWINDOW;
  startup_info.wShowWindow=SW_SHOWMINNOACTIVE;
  (void) CopyMagickString(local_command,command,MagickPathExtent);
  asynchronous=command[strlen(command)-1] == '&' ? MagickTrue : MagickFalse;
  if (asynchronous != MagickFalse)
    {
      local_command[strlen(command)-1]='\0';
      startup_info.wShowWindow=SW_SHOWDEFAULT;
    }
  else
    {
      if (command[strlen(command)-1] == '|')
        local_command[strlen(command)-1]='\0';
      else
        startup_info.wShowWindow=SW_HIDE;
      read_output=(HANDLE) NULL;
      if (output != (char *) NULL)
        {
          if (CreatePipe(&read_output,&write_output,NULL,0))
            {
              if (SetHandleInformation(write_output,HANDLE_FLAG_INHERIT,
                  HANDLE_FLAG_INHERIT))
                {
                  startup_info.dwFlags|=STARTF_USESTDHANDLES;
                  startup_info.hStdOutput=write_output;
                  startup_info.hStdError=write_output;
                }
              else
                CleanupOutputHandles;
            }
          else
            read_output=(HANDLE) NULL;
        }
    }
  status=CreateProcess((LPCTSTR) NULL,local_command,(LPSECURITY_ATTRIBUTES)
    NULL,(LPSECURITY_ATTRIBUTES) NULL,(BOOL) TRUE,(DWORD)
    NORMAL_PRIORITY_CLASS,(LPVOID) NULL,(LPCSTR) NULL,&startup_info,
    &process_info);
  if (status == 0)
    {
      CopyLastError;
      CleanupOutputHandles;
      return(last_error == ERROR_FILE_NOT_FOUND ? 127 : -1);
    }
  if (output != (char *) NULL)
    *output='\0';
  if (asynchronous != MagickFalse)
    return(status == 0);
  output_offset=0;
  status=STATUS_TIMEOUT;
  while (status == STATUS_TIMEOUT)
  {
    DWORD
      size;

    status=WaitForSingleObject(process_info.hProcess,1000);
    size=0;
    if (read_output != (HANDLE) NULL)
      if (!PeekNamedPipe(read_output,NULL,0,NULL,&size,NULL))
        break;
    while (size > 0)
    {
      char
        buffer[MagickPathExtent];

      DWORD
        bytes_read;

      if (ReadFile(read_output,buffer,MagickPathExtent-1,&bytes_read,NULL))
        {
          size_t
            count;

          count=MagickMin(MagickPathExtent-output_offset,
            (size_t) bytes_read+1);
          if (count > 0)
            {
              CopyMagickString(output+output_offset,buffer,count);
              output_offset+=count-1;
            }
        }
      if (!PeekNamedPipe(read_output,NULL,0,NULL,&size,NULL))
        break;
    }
  }
  if (status != WAIT_OBJECT_0)
    {
      CopyLastError;
      CleanupOutputHandles;
      return(status);
    }
  status=GetExitCodeProcess(process_info.hProcess,&child_status);
  if (status == 0)
    {
      CopyLastError;
      CleanupOutputHandles;
      return(-1);
    }
  CloseHandle(process_info.hProcess);
  CloseHandle(process_info.hThread);
  CleanupOutputHandles;
  return((int) child_status);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T S y s t e m C o n i f i g u r a t i o n                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTSystemConfiguration() provides a way for the application to determine
%  values for system limits or options at runtime.
%
%  The format of the exit method is:
%
%      ssize_t NTSystemConfiguration(int name)
%
%  A description of each parameter follows:
%
%    o name: _SC_PAGE_SIZE or _SC_PHYS_PAGES.
%
*/
MagickPrivate ssize_t NTSystemConfiguration(int name)
{
  switch (name)
  {
    case _SC_PAGE_SIZE:
    {
      SYSTEM_INFO
        system_info;

      GetSystemInfo(&system_info);
      return(system_info.dwPageSize);
    }
    case _SC_PHYS_PAGES:
    {
      MEMORYSTATUSEX
        status;

      SYSTEM_INFO
        system_info;

      status.dwLength=sizeof(status);
      if (GlobalMemoryStatusEx(&status) == 0)
        return(0L);
      GetSystemInfo(&system_info);
      return((ssize_t) status.ullTotalPhys/system_info.dwPageSize);
    }
    case _SC_OPEN_MAX:
      return(2048);
    default:
      break;
  }
  return(-1);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T T r u n c a t e F i l e                                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTTruncateFile() truncates a file to a specified length.
%
%  The format of the NTTruncateFile method is:
%
%      int NTTruncateFile(int file,off_t length)
%
%  A description of each parameter follows:
%
%    o file: the file.
%
%    o length: the file length.
%
*/
MagickPrivate int NTTruncateFile(int file,off_t length)
{
  DWORD
    file_pointer;

  HANDLE
    file_handle;

  long
    high,
    low;

  file_handle=(HANDLE) _get_osfhandle(file);
  if (file_handle == INVALID_HANDLE_VALUE)
    return(-1);
  low=(long) (length & 0xffffffffUL);
  high=(long) ((((MagickOffsetType) length) >> 32) & 0xffffffffUL);
  file_pointer=SetFilePointer(file_handle,low,&high,FILE_BEGIN);
  if ((file_pointer == 0xFFFFFFFF) && (GetLastError() != NO_ERROR))
    return(-1);
  if (SetEndOfFile(file_handle) == 0)
    return(-1);
  return(0);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
+  N T U n m a p M e m o r y                                                  %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTUnmapMemory() emulates the Unix munmap method.
%
%  The format of the NTUnmapMemory method is:
%
%      int NTUnmapMemory(void *map,size_t length)
%
%  A description of each parameter follows:
%
%    o map: the address of the binary large object.
%
%    o length: the length of the binary large object.
%
*/
MagickPrivate int NTUnmapMemory(void *map,size_t length)
{
  (void) length;
  if (UnmapViewOfFile(map) == 0)
    return(-1);
  return(0);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T W a r n i n g H a n d l e r                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTWarningHandler() displays a warning reason.
%
%  The format of the NTWarningHandler method is:
%
%      void NTWarningHandler(const ExceptionType severity,const char *reason,
%        const char *description)
%
%  A description of each parameter follows:
%
%    o severity: Specifies the numeric warning category.
%
%    o reason: Specifies the reason to display before terminating the
%      program.
%
%    o description: Specifies any description to the reason.
%
*/
MagickPrivate void NTWarningHandler(const ExceptionType severity,
  const char *reason,const char *description)
{
  char
    buffer[2*MagickPathExtent];

  (void) severity;
  if (reason == (char *) NULL)
    return;
  if (description == (char *) NULL)
    (void) FormatLocaleString(buffer,MagickPathExtent,"%s: %s.\n",GetClientName(),
      reason);
  else
    (void) FormatLocaleString(buffer,MagickPathExtent,"%s: %s (%s).\n",
      GetClientName(),reason,description);
  (void) MessageBox(NULL,buffer,"ImageMagick Warning",MB_OK | MB_TASKMODAL |
    MB_SETFOREGROUND | MB_ICONINFORMATION);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T W i n d o w s G e n e s i s                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTWindowsGenesis() initializes the MagickCore Windows environment.
%
%  The format of the NTWindowsGenesis method is:
%
%      void NTWindowsGenesis(void)
%
*/

MagickPrivate void NTWindowsGenesis(void)
{
  char
    *mode;

  mode=GetEnvironmentValue("MAGICK_ERRORMODE");
  if (mode != (char *) NULL)
    {
      (void) SetErrorMode(StringToInteger(mode));
      mode=DestroyString(mode);
    }
#if defined(_DEBUG) && !defined(__MINGW32__)
  if (IsEventLogging() != MagickFalse)
    {
      int
        debug;

      debug=_CrtSetDbgFlag(_CRTDBG_REPORT_FLAG);
      //debug |= _CRTDBG_CHECK_ALWAYS_DF;
      debug |= _CRTDBG_DELAY_FREE_MEM_DF;
      debug |= _CRTDBG_LEAK_CHECK_DF;
      (void) _CrtSetDbgFlag(debug);

      //_ASSERTE(_CrtCheckMemory());

      //_CrtSetBreakAlloc(42);
    }
#endif
#if defined(MAGICKCORE_INSTALLED_SUPPORT)
  {
    unsigned char
      *path;

    path=NTRegistryKeyLookup("LibPath");
    if (path != (unsigned char *) NULL)
      {
        wchar_t
          *lib_path;

        lib_path=create_wchar_path((const char *) path);
        if (lib_path != (wchar_t *) NULL)
          {
            SetDllDirectoryW(lib_path);
            lib_path=(wchar_t *) RelinquishMagickMemory(lib_path);
          }
        path=(unsigned char *) RelinquishMagickMemory(path);
      }
  }
#endif
}


/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N T W i n d o w s T e r m i n u s                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NTWindowsTerminus() terminates the MagickCore Windows environment.
%
%  The format of the NTWindowsTerminus method is:
%
%      void NTWindowsTerminus(void)
%
*/
MagickPrivate void NTWindowsTerminus(void)
{
  NTGhostscriptUnLoadDLL();
  DistributeCacheTerminus();
}
#endif