bit_ops.h

QT安全系统

/*
Copyright (C) 1999-2007 The Botan Project. All rights reserved.

Redistribution and use in source and binary forms, for any use, with or without
modification, is permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions, and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions, and the following disclaimer in the documentation
and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTOR(S) BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// LICENSEHEADER_END
namespace QCA { // WRAPNS_LINE
/*************************************************
* Bit/Word Operations Header File                *
* (C) 1999-2007 The Botan Project                *
*************************************************/

#ifndef BOTAN_BIT_OPS_H__
#define BOTAN_BIT_OPS_H__

} // WRAPNS_LINE
#include <botan/types.h>
namespace QCA { // WRAPNS_LINE

namespace Botan {

/*************************************************
* Rotation Functions                             *
*************************************************/
template<typename T> inline T rotate_left(T input, u32bit rot)
   { return (T)((input << rot) | (input >> (8*sizeof(T)-rot))); }

template<typename T> inline T rotate_right(T input, u32bit rot)
   { return (T)((input >> rot) | (input << (8*sizeof(T)-rot))); }

/*************************************************
* Byte Extraction Function                       *
*************************************************/
template<typename T> inline byte get_byte(u32bit byte_num, T input)
   { return (byte)(input >> ((sizeof(T)-1-(byte_num&(sizeof(T)-1))) << 3)); }

/*************************************************
* Byte to Word Conversions                       *
*************************************************/
inline u16bit make_u16bit(byte input0, byte input1)
   { return (u16bit)(((u16bit)input0 << 8) | input1); }

inline u32bit make_u32bit(byte input0, byte input1, byte input2, byte input3)
   { return (u32bit)(((u32bit)input0 << 24) | ((u32bit)input1 << 16) |
                     ((u32bit)input2 <<  8) | input3); }

inline u64bit make_u64bit(byte input0, byte input1, byte input2, byte input3,
                          byte input4, byte input5, byte input6, byte input7)
   {
   return (u64bit)(((u64bit)input0 << 56) | ((u64bit)input1 << 48) |
                   ((u64bit)input2 << 40) | ((u64bit)input3 << 32) |
                   ((u64bit)input4 << 24) | ((u64bit)input5 << 16) |
                   ((u64bit)input6 <<  8) | input7);
   }

/*************************************************
* XOR Functions                                  *
*************************************************/
void xor_buf(byte[], const byte[], u32bit);
void xor_buf(byte[], const byte[], const byte[], u32bit);

/*************************************************
* Misc Utility Functions                         *
*************************************************/
bool power_of_2(u64bit);
u32bit high_bit(u64bit);
u32bit low_bit(u64bit);
u32bit significant_bytes(u64bit);
u32bit hamming_weight(u64bit);

}

#endif
} // WRAPNS_LINE