mirror of
https://github.com/Chuyu-Team/VC-LTL5.git
synced 2026-10-18 13:50:46 +08:00
mingkuang
51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
//
|
|
// rotr.cpp
|
|
//
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
//
|
|
// Defines _lrotl(), _rotl(), and _rotl64(), which perform a rotate-right on an
|
|
// integer.
|
|
//
|
|
#include <stdlib.h>
|
|
#include <limits.h>
|
|
|
|
|
|
|
|
#pragma function(_lrotr, _rotr, _rotr64)
|
|
|
|
#if UINT_MAX != 0xffffffff
|
|
#error This source file assumes 32-bit integers
|
|
#endif
|
|
|
|
#if UINT_MAX != ULONG_MAX
|
|
#error This source file assumes sizeof(int) == sizeof(long)
|
|
#endif
|
|
|
|
|
|
#if 0
|
|
extern "C" unsigned long __cdecl _lrotr(unsigned long value, int shift)
|
|
{
|
|
shift &= 0x1f;
|
|
value = (value << (0x20 - shift)) | (value >> shift);
|
|
return value;
|
|
}
|
|
|
|
extern "C" unsigned __cdecl _rotr(unsigned value, int shift)
|
|
{
|
|
shift &= 0x1f;
|
|
value = (value << (0x20 - shift)) | (value >> shift);
|
|
return value;
|
|
}
|
|
#endif
|
|
|
|
#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows2003
|
|
extern "C" unsigned __int64 __cdecl _rotr64(unsigned __int64 value, int shift)
|
|
{
|
|
shift &= 0x3f;
|
|
value = (value << (0x40 - shift)) | (value >> shift);
|
|
return value;
|
|
}
|
|
|
|
_LCRT_DEFINE_IAT_SYMBOL(_rotr64);
|
|
#endif
|