source: trunk/src/kernel32/mmap.h@ 1036

/* $Id: mmap.h,v 1.9 1999-08-27 16:51:00 sandervl Exp $ */

/*
 * Memory mapped class
 *
 * Copyright 1999 Sander van Leeuwen (sandervl@xs4all.nl)
 *
 *
 * Project Odin Software License can be found in LICENSE.TXT
 *
 */
#ifndef __MMAP_H__
#define __MMAP_H__

#include <vmutex.h>

#ifndef PAGE_SIZE
#define PAGE_SIZE   4096
#endif

//commit 4 pages at once when the app accesses it
#define NRPAGES_TOCOMMIT        200

#define MEMMAP_ACCESS_READ      1
#define MEMMAP_ACCESS_WRITE     2
#define MEMMAP_ACCESS_EXECUTE   4

class Win32MemMapView;

//******************************************************************************
//******************************************************************************
class Win32MemMap
{
public:
   Win32MemMap(HFILE hfile, ULONG size, ULONG fdwProtect, LPSTR lpszName);
  ~Win32MemMap();

   BOOL   Init(HANDLE hMemMap);
   BOOL   flushView(ULONG offset, ULONG cbFlush);
   LPVOID mapViewOfFile(ULONG size, ULONG offset, ULONG fdwAccess);
   BOOL   unmapViewOfFile(Win32MemMapView *view);

   HFILE  getMapHandle()                 { return hMemMap; };
   LPSTR  getMemName()                   { return lpszMapName; };
   DWORD  getProtFlags()                 { return mProtFlags; };
   LPVOID getMappingAddr()               { return pMapping; };

   void   AddRef()                       { ++referenced; };
   void   Release()                      { if(--referenced == 0) delete this; };

   BOOL   commitPage(ULONG offset, BOOL fWriteAccess);

static Win32MemMap *findMap(LPSTR lpszName);
static Win32MemMap *findMap(ULONG address);

//Should only be called in ExitProcess
static void deleteAll();

protected:
   HFILE  hMemMap, hMemFile;
   ULONG  mSize;
   ULONG  mProtFlags;
   ULONG  mMapAccess;
   LPSTR  lpszMapName;
   void  *pMapping;

   ULONG  nrMappings;

   ULONG  referenced;

   VMutex mapMutex;

private:
   static Win32MemMap *memmaps;
          Win32MemMap *next;
};
//******************************************************************************
//Memory mapped file View Class
//******************************************************************************
class Win32MemMapView
{
public:
   Win32MemMapView(Win32MemMap *map, ULONG offset, ULONG size, ULONG fdwAccess);
  ~Win32MemMapView();

   DWORD  getAccessFlags()               { return mfAccess; };
   DWORD  getSize()                      { return mSize;    };
   LPVOID getViewAddr()                  { return pMapView; };
   ULONG  getOffset()                    { return mOffset;  };

   BOOL   everythingOk()                 { return errorState == 0; };

Win32MemMap *getParentMap()              { return mParentMap;};

static void             deleteView(Win32MemMap *map);
static Win32MemMap     *findMapByView(ULONG address, ULONG *offset, ULONG accessType, Win32MemMapView **pView=NULL);
static Win32MemMapView *findView(LPVOID address);

protected:
   ULONG  mSize, errorState;
   ULONG  mfAccess, mOffset;
   void  *pMapView;

   Win32MemMap *mParentMap;

private:
   static Win32MemMapView *mapviews;
          Win32MemMapView *next;

   friend class Win32MemMap;
};
//******************************************************************************
//******************************************************************************

#endif //__MMAP_H__