66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/***
|
|
*rotl.c - rotate an unsigned integer left
|
|
*
|
|
* Copyright (c) Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* defines _byteswap() - performs a byteswap on an unsigned integer.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <stdlib.h>
|
|
|
|
#pragma function(_byteswap_ulong, _byteswap_uint64, _byteswap_ushort)
|
|
|
|
/***
|
|
*unsigned long _byteswap_ulong(i) - long byteswap
|
|
*
|
|
*Purpose:
|
|
* Performs a byte swap on an unsigned integer.
|
|
*
|
|
*Entry:
|
|
* unsigned long i: value to swap
|
|
*
|
|
*Exit:
|
|
* returns swaped
|
|
*
|
|
*Exceptions:
|
|
* None.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
|
|
unsigned long __cdecl _byteswap_ulong(unsigned long i)
|
|
{
|
|
unsigned int j;
|
|
j = (i << 24);
|
|
j += (i << 8) & 0x00FF0000;
|
|
j += (i >> 8) & 0x0000FF00;
|
|
j += (i >> 24);
|
|
return j;
|
|
}
|
|
|
|
unsigned short __cdecl _byteswap_ushort(unsigned short i)
|
|
{
|
|
unsigned short j;
|
|
j = (i << 8) ;
|
|
j += (i >> 8) ;
|
|
return j;
|
|
}
|
|
|
|
unsigned __int64 __cdecl _byteswap_uint64(unsigned __int64 i)
|
|
{
|
|
unsigned __int64 j;
|
|
j = (i << 56);
|
|
j += (i << 40)&0x00FF000000000000;
|
|
j += (i << 24)&0x0000FF0000000000;
|
|
j += (i << 8)&0x000000FF00000000;
|
|
j += (i >> 8)&0x00000000FF000000;
|
|
j += (i >> 24)&0x0000000000FF0000;
|
|
j += (i >> 40)&0x000000000000FF00;
|
|
j += (i >> 56);
|
|
return j;
|
|
|
|
}
|