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/*****************************************************************************
 * dirent.h - dirent API for Microsoft Visual Studio
 *
 * Copyright (C) 2006 Toni Ronkko
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * ``Software''), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Dec 15, 2009, John Cunningham
 * Added rewinddir member function
 *
 * Jan 18, 2008, Toni Ronkko
 * Using FindFirstFileA and WIN32_FIND_DATAA to avoid converting string
 * between multi-byte and unicode representations.  This makes the
 * code simpler and also allows the code to be compiled under MingW.  Thanks
 * to Azriel Fasten for the suggestion.
 *
 * Mar 4, 2007, Toni Ronkko
 * Bug fix: due to the strncpy_s() function this file only compiled in
 * Visual Studio 2005.  Using the new string functions only when the
 * compiler version allows.
 *
 * Nov  2, 2006, Toni Ronkko
 * Major update: removed support for Watcom C, MS-DOS and Turbo C to
 * simplify the file, updated the code to compile cleanly on Visual
 * Studio 2005 with both unicode and multi-byte character strings,
 * removed rewinddir() as it had a bug.
 *
 * Aug 20, 2006, Toni Ronkko
 * Removed all remarks about MSVC 1.0, which is antiqued now.  Simplified
 * comments by removing SGML tags.
 *
 * May 14 2002, Toni Ronkko
 * Embedded the function definitions directly to the header so that no
 * source modules need to be included in the Visual Studio project.  Removed
 * all the dependencies to other projects so that this very header can be
 * used independently.
 *
 * May 28 1998, Toni Ronkko
 * First version.
 *****************************************************************************/
#ifndef __WINDOWS_DIRENT_H
#define __WINDOWS_DIRENT_H

#include <windows.h>
#include <string.h>
#include <assert.h>

typedef struct dirent
{
   char d_name[MAX_PATH + 1]; /* current dir entry (multi-byte char string) */
   WIN32_FIND_DATAA data;     /* file attributes */
}  dirent;


typedef struct DIR
{
   dirent current;            /* Current directory entry */
   int    cached;             /* Indicates un-processed entry in memory */
   HANDLE search_handle;      /* File search handle */
   char   patt[MAX_PATH + 3]; /* search pattern (3 = pattern + "\\*\0") */
} DIR;


/* Forward declarations */
static DIR *opendir (const char *dirname);
static struct dirent *readdir (DIR *dirp);
static int closedir (DIR *dirp);

#ifndef USE_VTK_COSMO
static void rewinddir(DIR* dirp);
#endif

/* Use the new safe string functions introduced in Visual Studio 2005 */
#if defined(_MSC_VER) && _MSC_VER >= 1400
# define STRNCPY(dest,src,size) strncpy_s((dest),(size),(src),_TRUNCATE)
#else
# define STRNCPY(dest,src,size) strncpy((dest),(src),(size))
#endif


/*****************************************************************************
 * Open directory stream DIRNAME for read and return a pointer to the
 * internal working area that is used to retrieve individual directory
 * entries.
 */
static DIR *opendir(const char *dirname)
{
   DIR *dirp;
   assert (dirname != NULL);
   assert (strlen (dirname) < MAX_PATH);

   /* construct new DIR structure */
   dirp = (DIR*) malloc (sizeof (struct DIR));
   if (dirp != NULL) {
      char *p;

      /* take directory name... */
      STRNCPY (dirp->patt, dirname, sizeof(dirp->patt));
      dirp->patt[MAX_PATH] = '\0';

      /* ... and append search pattern to it */
      p = strchr (dirp->patt, '\0');
      if (dirp->patt < p  &&  *(p-1) != '\\'  &&  *(p-1) != ':') {
         *p++ = '\\';
      }
      *p++ = '*';
      *p = '\0';

      /* open stream and retrieve first file */
      dirp->search_handle = FindFirstFileA (dirp->patt, &dirp->current.data);
      if (dirp->search_handle == INVALID_HANDLE_VALUE) {
         /* invalid search pattern? */
         free (dirp);
         return NULL;
      }

      /* there is an un-processed directory entry in memory now */
      dirp->cached = 1;
   }

   return dirp;
}


/*****************************************************************************
 * Read a directory entry, and return a pointer to a dirent structure
 * containing the name of the entry in d_name field.  Individual directory
 * entries returned by this very function include regular files,
 * sub-directories, pseudo-directories "." and "..", but also volume labels,
 * hidden files and system files may be returned.
 */
static struct dirent *readdir(DIR *dirp)
{
   assert (dirp != NULL);

   if (dirp->search_handle == INVALID_HANDLE_VALUE) {
      /* directory stream was opened/rewound incorrectly or ended normally */
      return NULL;
   }

   /* get next directory entry */
   if (dirp->cached != 0) {
      /* a valid directory entry already in memory */
      dirp->cached = 0;
   } else {
      /* read next directory entry from disk */
      if (FindNextFileA (dirp->search_handle, &dirp->current.data) == FALSE) {
         /* the very last file has been processed or an error occured */
         FindClose (dirp->search_handle);
         dirp->search_handle = INVALID_HANDLE_VALUE;
         return NULL;
      }
   }

   /* copy as a multibyte character string */
   STRNCPY ( dirp->current.d_name,
             dirp->current.data.cFileName,
             sizeof(dirp->current.d_name) );
   dirp->current.d_name[MAX_PATH] = '\0';

   return &dirp->current;
}

/*****************************************************************************
 * Close directory stream opened by opendir() function.  Close of the
 * directory stream invalidates the DIR structure as well as any previously
 * read directory entry.
 */
static int closedir(DIR *dirp)
{
   assert (dirp != NULL);

   /* release search handle */
   if (dirp->search_handle != INVALID_HANDLE_VALUE) {
      FindClose (dirp->search_handle);
      dirp->search_handle = INVALID_HANDLE_VALUE;
   }

   /* release directory handle */
   free (dirp);
   return 0;
}

#ifndef USE_VTK_COSMO

/*****************************************************************************
 * Resets the position of the directory stream to which dirp refers to the
 * beginning of the directory. It also causes the directory stream to refer
 * to the current state of the corresponding directory, as a call to opendir()
 * would have done. If dirp does not refer to a directory stream, the effect
 * is undefined.
 */
static void rewinddir(DIR* dirp)
{
   /* release search handle */
   if (dirp->search_handle != INVALID_HANDLE_VALUE) {
      FindClose (dirp->search_handle);
      dirp->search_handle = INVALID_HANDLE_VALUE;
   }

   /* open new search handle and retrieve first file */
   dirp->search_handle = FindFirstFileA (dirp->patt, &dirp->current.data);
   if (dirp->search_handle == INVALID_HANDLE_VALUE) {
      /* invalid search pattern? */
      free (dirp);
      return;
   }

   /* there is an un-processed directory entry in memory now */
   dirp->cached = 1;
}

#endif

#endif /*__WINDOWS_DIRENT_H*/