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