icuSources/common/umapfile.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 ******************************************************************************
   5 *
   6 *   Copyright (C) 1999-2011, International Business Machines
   7 *   Corporation and others.  All Rights Reserved.
   8 *
   9 ******************************************************************************/
  10
  11 /*----------------------------------------------------------------------------------
  12  *
  13  *       Memory mapped file wrappers for use by the ICU Data Implementation
  14  *
  15  *           Porting note:  The implementation of these functions is very platform specific.
  16  *             Not all platforms can do real memory mapping.  Those that can't
  17  *             still must implement these functions, getting the data into memory using
  18  *             whatever means are available.
  19  *
  20  *            These functions are part of the ICU internal implementation, and
  21  *            are not inteded to be used directly by applications.
  22  *
  23  *----------------------------------------------------------------------------------*/
  24
  25 #ifndef __UMAPFILE_H__
  26 #define __UMAPFILE_H__
  27
  28 #include "unicode/putil.h"
  29 #include "unicode/udata.h"
  30 #include "putilimp.h"
  31
  32 U_CFUNC UBool uprv_mapFile(UDataMemory *pdm, const char *path, UErrorCode *status);
  33 U_CFUNC void  uprv_unmapFile(UDataMemory *pData);
  34
  35 /* MAP_NONE: no memory mapping, no file access at all */
  36 #define MAP_NONE        0
  37 #define MAP_WIN32       1
  38 #define MAP_POSIX       2
  39 #define MAP_STDIO       3
  40 #define MAP_390DLL      4
  41
  42 #if UCONFIG_NO_FILE_IO
  43 #   define MAP_IMPLEMENTATION MAP_NONE
  44 #elif U_PLATFORM_USES_ONLY_WIN32_API
  45 #   define MAP_IMPLEMENTATION MAP_WIN32
  46 #elif U_HAVE_MMAP || U_PLATFORM == U_PF_OS390
  47 #   if U_PLATFORM == U_PF_OS390 && defined (OS390_STUBDATA)
  48         /*   No memory mapping for 390 batch mode.  Fake it using dll loading.  */
  49 #       define MAP_IMPLEMENTATION MAP_390DLL
  50 #   else
  51 #       define MAP_IMPLEMENTATION MAP_POSIX
  52 #   endif
  53 #else /* unknown platform, no memory map implementation: use stdio.h and uprv_malloc() instead */
  54 #   define MAP_IMPLEMENTATION MAP_STDIO
  55 #endif
  56
  57 #endif