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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+* Copyright (C) 1999-2011, 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"
+#include "putilimp.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 U_PLATFORM_USES_ONLY_WIN32_API
+# define MAP_IMPLEMENTATION MAP_WIN32
+#elif U_HAVE_MMAP || U_PLATFORM == U_PF_OS390
+# if U_PLATFORM == U_PF_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