From e611b132f9b8abe35b362e5870b74bce94a1e58e Mon Sep 17 00:00:00 2001
From: Adam <you@example.com>
Date: Sat, 16 May 2020 20:51:50 -0700
Subject: initial commit

---
 private/inc/align.h | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 private/inc/align.h

(limited to 'private/inc/align.h')

diff --git a/private/inc/align.h b/private/inc/align.h
new file mode 100644
index 000000000..3a320acf7
--- /dev/null
+++ b/private/inc/align.h
@@ -0,0 +1,147 @@
+/*++
+
+Copyright (c) 1988-1992  Microsoft Corporation
+
+Module Name:
+
+    Align.h
+
+Abstract:
+
+    BUGBUG
+
+Author:
+
+    John Rogers (JohnRo) 15-May-1991
+
+Environment:
+
+    This code assumes that sizeof(DWORD) >= sizeof(LPVOID).
+
+Revision History:
+
+    15-May-1991 JohnRo
+        Created align.h for NT/LAN from OS/2 1.2 HPFS pbmacros.h.
+    19-Jun-1991 JohnRo
+        Make sure pointer-to-wider-then-byte doesn't get messed up.
+    10-Jul-1991 JohnRo
+        Added ALIGN_BYTE and ALIGN_CHAR for completeness.
+    21-Aug-1991 CliffV
+        Fix ROUND_DOWN_* to include ~
+    03-Dec-1991 JohnRo
+        Worst-case on MIPS is 8-byte alignment.
+        Added COUNT_IS_ALIGNED() and POINTER_IS_ALIGNED() macros.
+    26-Jun-1992 JohnRo
+        RAID 9933: ALIGN_WORST should be 8 for x86 builds.
+
+--*/
+
+#ifndef _ALIGN_
+#define _ALIGN_
+
+
+// BOOL
+// COUNT_IS_ALIGNED(
+//     IN DWORD Count,
+//     IN DWORD Pow2      // undefined if this isn't a power of 2.
+//     );
+//
+#define COUNT_IS_ALIGNED(Count,Pow2) \
+        ( ( ( (Count) & (((Pow2)-1)) ) == 0) ? TRUE : FALSE )
+
+// BOOL
+// POINTER_IS_ALIGNED(
+//     IN LPVOID Ptr,
+//     IN DWORD Pow2      // undefined if this isn't a power of 2.
+//     );
+//
+#define POINTER_IS_ALIGNED(Ptr,Pow2) \
+        ( ( ( ((DWORD)(Ptr)) & (((Pow2)-1)) ) == 0) ? TRUE : FALSE )
+
+
+#define ROUND_DOWN_COUNT(Count,Pow2) \
+        ( (Count) & (~((Pow2)-1)) )
+
+#define ROUND_DOWN_POINTER(Ptr,Pow2) \
+        ( (LPVOID) ROUND_DOWN_COUNT( ((DWORD)(Ptr)), (Pow2) ) )
+
+
+// If Count is not already aligned, then
+// round Count up to an even multiple of "Pow2".  "Pow2" must be a power of 2.
+//
+// DWORD
+// ROUND_UP_COUNT(
+//     IN DWORD Count,
+//     IN DWORD Pow2
+//     );
+#define ROUND_UP_COUNT(Count,Pow2) \
+        ( ((Count)+(Pow2)-1) & (~((Pow2)-1)) )
+
+// LPVOID
+// ROUND_UP_POINTER(
+//     IN LPVOID Ptr,
+//     IN DWORD Pow2
+//     );
+
+// If Ptr is not already aligned, then round it up until it is.
+#define ROUND_UP_POINTER(Ptr,Pow2) \
+        ( (LPVOID) ( (((DWORD)(Ptr))+(Pow2)-1) & (~((Pow2)-1)) ) )
+
+
+// Usage: myPtr = ROUND_UP_POINTER(unalignedPtr, ALIGN_DWORD);
+
+
+#if defined(_X86_)
+
+#define ALIGN_BYTE              1
+#define ALIGN_CHAR              1
+#define ALIGN_DESC_CHAR         sizeof(DESC_CHAR)
+#define ALIGN_DWORD             4
+#define ALIGN_LONG              4
+#define ALIGN_LPBYTE            4
+#define ALIGN_LPDWORD           4
+#define ALIGN_LPSTR             4
+#define ALIGN_LPTSTR            4
+#define ALIGN_LPVOID            4
+#define ALIGN_LPWORD            4
+#define ALIGN_TCHAR             sizeof(TCHAR)
+#define ALIGN_WCHAR             sizeof(WCHAR)
+#define ALIGN_WORD              2
+#define ALIGN_QUAD              8
+
+#define ALIGN_WORST             8
+
+#elif defined(_MIPS_) || defined(_ALPHA_) || defined(_PPC_)
+
+#define ALIGN_BYTE              1
+#define ALIGN_CHAR              1
+#define ALIGN_DESC_CHAR         sizeof(DESC_CHAR)
+#define ALIGN_DWORD             4
+#define ALIGN_LONG              4
+#define ALIGN_LPBYTE            4
+#define ALIGN_LPDWORD           4
+#define ALIGN_LPSTR             4
+#define ALIGN_LPTSTR            4
+#define ALIGN_LPVOID            4
+#define ALIGN_LPWORD            4
+#define ALIGN_TCHAR             sizeof(TCHAR)
+#define ALIGN_WCHAR             sizeof(WCHAR)
+#define ALIGN_WORD              2
+#define ALIGN_QUAD              8
+
+//
+// Worst-case alignment on MIPS is 8 bytes (for double).  Specify this here,
+// in case our allocator is used for structures containing this.  (That is,
+// even though NT/LAN doesn't need this for our data structures, let's be
+// permissive.) The alignment requirements apply to Alpha.
+//
+#define ALIGN_WORST             8
+
+#else  // none of the above
+
+#error "Unknown alignment requirements for align.h"
+
+#endif  // none of the above
+
+
+#endif  // _ALIGN_
-- 
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