Check in the pristine copy of ICU 4.6...

icu46/source/common/umapfile.h

+/*
+******************************************************************************
+*
+*   Copyright (C) 1999-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************/
+
+/*----------------------------------------------------------------------------------
+ *
+ *       Memory mapped file wrappers for use by the ICU Data Implementation
+ *
+ *           Porting note:  The implementation of these functions is very platform specific.
+ *             Not all platforms can do real memory mapping.  Those that can't
+ *             still must implement these functions, getting the data into memory using
+ *             whatever means are available.
+ *
+ *            These functions are part of the ICU internal implementation, and
+ *            are not inteded to be used directly by applications.
+ *
+ *----------------------------------------------------------------------------------*/
+
+#ifndef __UMAPFILE_H__
+#define __UMAPFILE_H__
+
+#include "unicode/putil.h"
+#include "unicode/udata.h"
+
+U_CFUNC UBool uprv_mapFile(UDataMemory *pdm, const char *path);
+U_CFUNC void  uprv_unmapFile(UDataMemory *pData);
+
+/* MAP_NONE: no memory mapping, no file access at all */
+#define MAP_NONE        0
+#define MAP_WIN32       1
+#define MAP_POSIX       2
+#define MAP_STDIO       3
+#define MAP_390DLL      4
+
+#if UCONFIG_NO_FILE_IO
+#   define MAP_IMPLEMENTATION MAP_NONE
+#elif defined(U_WINDOWS)
+#   define MAP_IMPLEMENTATION MAP_WIN32
+#elif U_HAVE_MMAP || defined(OS390)
+#   if defined(OS390) && defined (OS390_STUBDATA)
+        /*   No memory mapping for 390 batch mode.  Fake it using dll loading.  */
+#       define MAP_IMPLEMENTATION MAP_390DLL
+#   else
+#       define MAP_IMPLEMENTATION MAP_POSIX
+#   endif
+#else /* unknown platform, no memory map implementation: use stdio.h and uprv_malloc() instead */
+#   define MAP_IMPLEMENTATION MAP_STDIO
+#endif
+
+#endif