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/*************************************************
* Bit/Word Operations Header File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#ifndef BOTAN_BIT_OPS_H__
#define BOTAN_BIT_OPS_H__
#include <botan/types.h>
namespace Botan {
/*************************************************
* Word Rotation Functions *
*************************************************/
template<typename T> inline T rotate_left(T input, u32bit rot)
{
return static_cast<T>((input << rot) | (input >> (8*sizeof(T)-rot)));;
}
template<typename T> inline T rotate_right(T input, u32bit rot)
{
return static_cast<T>((input >> rot) | (input << (8*sizeof(T)-rot)));
}
/*************************************************
* Byteswap *
*************************************************/
inline u16bit reverse_bytes(u16bit input)
{
return rotate_left(input, 8);
}
inline u32bit reverse_bytes(u32bit input)
{
input = ((input & 0xFF00FF00) >> 8) | ((input & 0x00FF00FF) << 8);
return rotate_left(input, 16);
}
inline u64bit reverse_bytes(u64bit input)
{
input = ((input & 0xFF00FF00FF00FF00) >> 8) |
((input & 0x00FF00FF00FF00FF) << 8);
input = ((input & 0xFFFF0000FFFF0000) >> 16) |
((input & 0x0000FFFF0000FFFF) << 16);
return rotate_left(input, 32);
}
/*************************************************
* Array XOR *
*************************************************/
void xor_buf(byte[], const byte[], u32bit);
void xor_buf(byte[], const byte[], const byte[], u32bit);
/*************************************************
* Simple Bit Manipulation *
*************************************************/
bool power_of_2(u64bit);
u32bit high_bit(u64bit);
u32bit low_bit(u64bit);
u32bit significant_bytes(u64bit);
u32bit hamming_weight(u64bit);
}
#endif
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