icuSources/common/umapfile.h

   1 /*
   2 ******************************************************************************
   3 *
   4 *   Copyright (C) 1999-2010, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 ******************************************************************************/
   8
   9 /*----------------------------------------------------------------------------------
  10  *
  11  *       Memory mapped file wrappers for use by the ICU Data Implementation
  12  *
  13  *           Porting note:  The implementation of these functions is very platform specific.
  14  *             Not all platforms can do real memory mapping.  Those that can't
  15  *             still must implement these functions, getting the data into memory using
  16  *             whatever means are available.
  17  *
  18  *            These functions are part of the ICU internal implementation, and
  19  *            are not inteded to be used directly by applications.
  20  *
  21  *----------------------------------------------------------------------------------*/
  22
  23 #ifndef __UMAPFILE_H__
  24 #define __UMAPFILE_H__
  25
  26 #include "unicode/putil.h"
  27 #include "unicode/udata.h"
  28
  29 U_CFUNC UBool uprv_mapFile(UDataMemory *pdm, const char *path);
  30 U_CFUNC void  uprv_unmapFile(UDataMemory *pData);
  31
  32 /* MAP_NONE: no memory mapping, no file access at all */
  33 #define MAP_NONE        0
  34 #define MAP_WIN32       1
  35 #define MAP_POSIX       2
  36 #define MAP_STDIO       3
  37 #define MAP_390DLL      4
  38
  39 #if UCONFIG_NO_FILE_IO
  40 #   define MAP_IMPLEMENTATION MAP_NONE
  41 #elif defined(U_WINDOWS)
  42 #   define MAP_IMPLEMENTATION MAP_WIN32
  43 #elif U_HAVE_MMAP || defined(OS390)
  44 #   if defined(OS390) && defined (OS390_STUBDATA)
  45         /*   No memory mapping for 390 batch mode.  Fake it using dll loading.  */
  46 #       define MAP_IMPLEMENTATION MAP_390DLL
  47 #   else
  48 #       define MAP_IMPLEMENTATION MAP_POSIX
  49 #   endif
  50 #else /* unknown platform, no memory map implementation: use stdio.h and uprv_malloc() instead */
  51 #   define MAP_IMPLEMENTATION MAP_STDIO
  52 #endif
  53
  54 #endif