1 files changed, 79 insertions, 0 deletions
diff --git a/src/ux-mmap.c b/src/ux-mmap.c
new file mode 100644
index 0000000..35b9aba
--- /dev/null
+++ b/src/ux-mmap.c
@@ -0,0 +1,79 @@
+/*
+ *	libHX/ux-mmap.c
+ *	Copyright Jan Engelhardt, 2005-2006
+ *
+ *	This file is part of libHX. libHX is free software; you can
+ *	redistribute it and/or modify it under the terms of the GNU Lesser
+ *	General Public License as published by the Free Software Foundation;
+ *	either version 2.1 or (at your option) any later version.
+ */
+#include <sys/types.h>
+#include <io.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <windows.h>
+#include "internal.h"
+#include <libHX/misc.h>
+
+static __inline__ DWORD dw_desired_access(int, int);
+static __inline__ DWORD fl_protect(int, int);
+
+EXPORT_SYMBOL void *mmap(void *start, size_t length, int prot, int flags,
+    int fd, off_t offset)
+{
+	HANDLE filp, fmap;
+	void *p;
+
+	filp = reinterpret_cast(HANDLE, _get_osfhandle(fd));
+	fmap = CreateFileMapping(filp, NULL, fl_protect(prot, flags),
+	       0, 0, NULL);
+	if (fmap == NULL)
+		return MAP_FAILED;
+
+	p = MapViewOfFile(fmap, dw_desired_access(prot, flags),
+		((int64_t)offset >> 32) & 0xFFFFFFFFUL,
+		offset & 0xFFFFFFFFUL, length);
+	CloseHandle(fmap);
+	if (p == NULL)
+		return MAP_FAILED;
+
+	return p;
+}
+
+EXPORT_SYMBOL int munmap(void *start, size_t length)
+{
+	if (!UnmapViewOfFile(start))
+		return -1;
+	return 0;
+}
+
+static __inline__ DWORD dw_desired_access(int prot, int flags)
+{
+	if (flags & MAP_PRIVATE) return FILE_MAP_COPY;
+	if (prot & PROT_WRITE)   return FILE_MAP_WRITE;
+	if (prot & PROT_READ)	return FILE_MAP_READ;
+#ifdef FILE_MAP_EXECUTE /* WinXP SP2 or WinServer2003 SP1 */
+	if (prot & PROT_EXEC)	return FILE_MAP_EXECUTE;
+#endif
+	return 0;
+}
+
+static __inline__ DWORD fl_protect(int prot, int flags)
+{
+	if (flags & MAP_PRIVATE)
+		return PAGE_WRITECOPY;
+#ifdef PAGE_EXECUTE_READ
+	if (flags & (PROT_EXEC | PROT_READ))
+		return PAGE_EXECUTE_READ;
+#endif
+#ifdef PAGE_EXECUTE_READWRITE
+	if (flags & (PROT_EXEC | PROT_READ | PROT_WRITE))
+		return PAGE_EXECUTE_READWRITE;
+#endif
+	if (flags & PROT_WRITE)
+		return PAGE_READWRITE;
+	if (flags & PROT_READ)
+		return PAGE_READONLY;
+	return 0;
+}