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The Windows Access Control Model: Part 2

, 27 Jun 2005
This second part of the Access Control series will program with the basic Access Control structures.
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/*
 *
 * Copyright (c) 1998-2002
 * Dr John Maddock
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Dr John Maddock makes no representations
 * about the suitability of this software for any purpose.  
 * It is provided "as is" without express or implied warranty.
 *
 */
 
 /*
  *   LOCATION:    see http://www.boost.org for most recent version.
  *   FILE         fileiter.hpp
  *   VERSION      see <boost/version.hpp>
  *   DESCRIPTION: Declares various platform independent file and
  *                directory iterators, plus binary file input in
  *                the form of class map_file.
  */

#ifndef BOOST_RE_FILEITER_HPP_INCLUDED
#define BOOST_RE_FILEITER_HPP_INCLUDED

#ifndef BOOST_REGEX_CONFIG_HPP
#include <boost/regex/config.hpp>
#endif

#ifndef BOOST_REGEX_NO_FILEITER

#if (defined(__CYGWIN__) || defined(__CYGWIN32__)) && !defined(BOOST_REGEX_NO_W32)
#error "Sorry, can't mix <windows.h> with STL code and gcc compiler: if you ran configure, try again with configure --disable-ms-windows"
#define BOOST_REGEX_FI_WIN32_MAP
#define BOOST_REGEX_FI_POSIX_DIR
#elif (defined(__WIN32__) || defined(_WIN32) || defined(WIN32)) && !defined(BOOST_REGEX_NO_W32)
#define BOOST_REGEX_FI_WIN32_MAP
#define BOOST_REGEX_FI_WIN32_DIR
#else
#define BOOST_REGEX_FI_POSIX_MAP
#define BOOST_REGEX_FI_POSIX_DIR
#endif

#if defined(BOOST_REGEX_FI_WIN32_MAP)||defined(BOOST_REGEX_FI_WIN32_DIR)
#include <windows.h>
#endif

#if defined(BOOST_REGEX_FI_WIN32_DIR)

namespace boost{
   namespace re_detail{

typedef WIN32_FIND_DATAA _fi_find_data;
typedef HANDLE _fi_find_handle;

   } // namespace re_detail

} // namespace boost

#define _fi_invalid_handle INVALID_HANDLE_VALUE
#define _fi_dir FILE_ATTRIBUTE_DIRECTORY

#elif defined(BOOST_REGEX_FI_POSIX_DIR)

#include <cstdio>
#include <cctype>
#include <iterator>
#include <list>
#include <cassert>
#include <dirent.h>

#if defined(__SUNPRO_CC)
using std::list;
#endif

#ifndef MAX_PATH
#define MAX_PATH 256
#endif

namespace boost{
   namespace re_detail{

#ifdef __BORLANDC__
   #pragma option push -a8 -b -Vx -Ve -pc
#endif

struct _fi_find_data
{
   unsigned dwFileAttributes;
   char cFileName[MAX_PATH];
};

struct _fi_priv_data;

typedef _fi_priv_data* _fi_find_handle;
#define _fi_invalid_handle 0
#define _fi_dir 1

_fi_find_handle _fi_FindFirstFile(const char* lpFileName, _fi_find_data* lpFindFileData);
bool _fi_FindNextFile(_fi_find_handle hFindFile,   _fi_find_data* lpFindFileData);
bool _fi_FindClose(_fi_find_handle hFindFile);

#ifdef __BORLANDC__
 #if __BORLANDC__ > 0x520
  #pragma option pop
 #endif
#endif

   } // namespace re_detail
} // namespace boost

#ifdef FindFirstFile
 #undef FindFirstFile
#endif
#ifdef FindNextFile
 #undef FindNextFile
#endif
#ifdef FindClose
 #undef FindClose
#endif

#define FindFirstFileA _fi_FindFirstFile
#define FindNextFileA _fi_FindNextFile
#define FindClose _fi_FindClose

#endif

namespace boost{
   namespace re_detail{

#ifdef __BORLANDC__
   #if __BORLANDC__ == 0x530
    #pragma option push -a4 -b
   #elif __BORLANDC__ > 0x530
    #pragma option push -a8 -b
   #endif
#endif

#ifdef BOOST_REGEX_FI_WIN32_MAP // win32 mapfile

class BOOST_REGEX_DECL mapfile
{
   HANDLE hfile;
   HANDLE hmap;
   const char* _first;
   const char* _last;
public:

   typedef const char* iterator;

   mapfile(){ hfile = hmap = 0; _first = _last = 0; }
   mapfile(const char* file){ hfile = hmap = 0; _first = _last = 0; open(file); }
   ~mapfile(){ close(); }
   void open(const char* file);
   void close();
   const char* begin(){ return _first; }
   const char* end(){ return _last; }
   size_t size(){ return _last - _first; }
   bool valid(){ return (hfile != 0) && (hfile != INVALID_HANDLE_VALUE); }
};


#else

class BOOST_REGEX_DECL mapfile_iterator;

class BOOST_REGEX_DECL mapfile
{
   typedef char* pointer;
   std::FILE* hfile;
   long int _size;
   pointer* _first;
   pointer* _last;
   mutable std::list<pointer*> condemed;
   enum sizes
   {
      buf_size = 4096
   };
   void lock(pointer* node)const;
   void unlock(pointer* node)const;
public:

   typedef mapfile_iterator iterator;

   mapfile(){ hfile = 0; _size = 0; _first = _last = 0; }
   mapfile(const char* file){ hfile = 0; _size = 0; _first = _last = 0; open(file); }
   ~mapfile(){ close(); }
   void open(const char* file);
   void close();
   iterator begin()const;
   iterator end()const;
   unsigned long size()const{ return _size; }
   bool valid()const{ return hfile != 0; }
   friend class mapfile_iterator;
};

class BOOST_REGEX_DECL mapfile_iterator
#if !defined(BOOST_NO_STD_ITERATOR) || defined(BOOST_MSVC_STD_ITERATOR)
: public std::iterator<std::random_access_iterator_tag, char>
#endif
{
   typedef mapfile::pointer internal_pointer;
   internal_pointer* node;
   const mapfile* file;
   unsigned long offset;
   long position()const
   {
      return file ? ((node - file->_first) * mapfile::buf_size + offset) : 0;
   }
   void position(long pos)
   {
      if(file)
      {
         node = file->_first + (pos / mapfile::buf_size);
         offset = pos % mapfile::buf_size;
      }
   }
public:
   typedef std::ptrdiff_t                  difference_type;
   typedef char                            value_type;
   typedef const char*                     pointer;
   typedef const char&                     reference;
   typedef std::random_access_iterator_tag iterator_category;

   mapfile_iterator() { node = 0; file = 0; offset = 0; }
   mapfile_iterator(const mapfile* f, long position)
   {
      file = f;
      node = f->_first + position / mapfile::buf_size;
      offset = position % mapfile::buf_size;
      if(file)
         file->lock(node);
   }
   mapfile_iterator(const mapfile_iterator& i)
   {
      file = i.file;
      node = i.node;
      offset = i.offset;
      if(file)
         file->lock(node);
   }
   ~mapfile_iterator()
   {
      if(file && node)
         file->unlock(node);
   }
   mapfile_iterator& operator = (const mapfile_iterator& i);
   char operator* ()const
   {
      assert(node >= file->_first);
      assert(node < file->_last);
      return file ? *(*node + sizeof(int) + offset) : char(0);
   }
   char operator[] (long off)const
   {
      mapfile_iterator tmp(*this);
      tmp += off;
      return *tmp;
   }
   mapfile_iterator& operator++ ();
   mapfile_iterator operator++ (int);
   mapfile_iterator& operator-- ();
   mapfile_iterator operator-- (int);

   mapfile_iterator& operator += (long off)
   {
      position(position() + off);
      return *this;
   }
   mapfile_iterator& operator -= (long off)
   {
      position(position() - off);
      return *this;
   }

   friend inline bool operator==(const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return (i.file == j.file) && (i.node == j.node) && (i.offset == j.offset);
   }

   friend inline bool operator!=(const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return !(i == j);
   }

   friend inline bool operator<(const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return i.position() < j.position();
   }
   friend inline bool operator>(const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return i.position() > j.position();
   }
   friend inline bool operator<=(const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return i.position() <= j.position();
   }
   friend inline bool operator>=(const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return i.position() >= j.position();
   }

   friend mapfile_iterator operator + (const mapfile_iterator& i, long off);
   friend mapfile_iterator operator + (long off, const mapfile_iterator& i)
   {
      mapfile_iterator tmp(i);
      return tmp += off;
   }
   friend mapfile_iterator operator - (const mapfile_iterator& i, long off);
   friend inline long operator - (const mapfile_iterator& i, const mapfile_iterator& j)
   {
      return i.position() - j.position();
   }
};

#endif

// _fi_sep determines the directory separator, either '\\' or '/'
BOOST_REGEX_DECL extern const char* _fi_sep;

struct file_iterator_ref
{
   _fi_find_handle hf;
   _fi_find_data _data;
   long count;
};


class BOOST_REGEX_DECL file_iterator 
{
   char* _root;
   char* _path;
   char* ptr;
   file_iterator_ref* ref;

public:
   typedef std::ptrdiff_t            difference_type;
   typedef const char*               value_type;
   typedef const char**              pointer;
   typedef const char*&              reference;
   typedef std::input_iterator_tag   iterator_category;

   file_iterator();
   file_iterator(const char* wild);
   ~file_iterator();
   file_iterator(const file_iterator&);
   file_iterator& operator=(const file_iterator&);
   const char* root()const { return _root; }
   const char* path()const { return _path; }
   const char* name()const { return ptr; }
   _fi_find_data* data() { return &(ref->_data); }
   void next();
   file_iterator& operator++() { next(); return *this; }
   file_iterator operator++(int);
   const char* operator*() { return path(); }

   friend inline bool operator == (const file_iterator& f1, const file_iterator& f2)
   {
      return ((f1.ref->hf == _fi_invalid_handle) && (f2.ref->hf == _fi_invalid_handle));
   }

   friend inline bool operator != (const file_iterator& f1, const file_iterator& f2)
   {
      return !(f1 == f2);
   }

};

// dwa 9/13/00 - suppress unused parameter warning
inline bool operator < (const file_iterator&, const file_iterator&)
{
   return false;
}


class BOOST_REGEX_DECL directory_iterator
{
   char* _root;
   char* _path;
   char* ptr;
   file_iterator_ref* ref;

public:
   typedef std::ptrdiff_t            difference_type;
   typedef const char*               value_type;
   typedef const char**              pointer;
   typedef const char*&              reference;
   typedef std::input_iterator_tag   iterator_category;

   directory_iterator();
   directory_iterator(const char* wild);
   ~directory_iterator();
   directory_iterator(const directory_iterator& other);
   directory_iterator& operator=(const directory_iterator& other);

   const char* root()const { return _root; }
   const char* path()const { return _path; }
   const char* name()const { return ptr; }
   _fi_find_data* data() { return &(ref->_data); }
   void next();
   directory_iterator& operator++() { next(); return *this; }
   directory_iterator operator++(int);
   const char* operator*() { return path(); }

   static const char* separator() { return _fi_sep; }

   friend inline bool operator == (const directory_iterator& f1, const directory_iterator& f2)
   {
      return ((f1.ref->hf == _fi_invalid_handle) && (f2.ref->hf == _fi_invalid_handle));
   }


   friend inline bool operator != (const directory_iterator& f1, const directory_iterator& f2)
   {
      return !(f1 == f2);
   }

   };

inline bool operator < (const directory_iterator&, const directory_iterator&)
{
   return false;
}

#ifdef __BORLANDC__
  #pragma option pop
#endif


} // namespace re_detail
using boost::re_detail::directory_iterator;
using boost::re_detail::file_iterator;
using boost::re_detail::mapfile;
} // namespace boost

#endif     // BOOST_REGEX_NO_FILEITER
#endif     // BOOST_RE_FILEITER_HPP

















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About the Author

oshah
Web Developer
United States United States
Mr. Shah is a reclusive C++/C# developer lurking somewhere in the depths of the city of London. He learnt physics at Kings' College London and obtained a Master in Science there. Having earned an MCAD, he teeters on the brink of transitioning from C++ to C#, unsure of which language to jump to. Fortunately, he also knows how to use .NET interop to merge code between the two languages (which means he won't have to make the choice anytime soon).
 
His interests (apart from programming) are walking, football (the real one!), philosophy, history, retro-gaming, strategy gaming, and any good game in general.
 
He maintains a website / blog / FAQ / junk at shexec32.serveftp.net, where he places the best answers he's written to the questions you've asked. If you can find him, maybe you can hire Mr. Shah to help you with anything C++[/CLI]/C#/.NET related Smile | :) .

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