qca

bit_ops.h

00001 /*
00002 Copyright (C) 1999-2007 The Botan Project. All rights reserved.
00003 
00004 Redistribution and use in source and binary forms, for any use, with or without
00005 modification, is permitted provided that the following conditions are met:
00006 
00007 1. Redistributions of source code must retain the above copyright notice, this
00008 list of conditions, and the following disclaimer.
00009 
00010 2. Redistributions in binary form must reproduce the above copyright notice,
00011 this list of conditions, and the following disclaimer in the documentation
00012 and/or other materials provided with the distribution.
00013 
00014 THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) "AS IS" AND ANY EXPRESS OR IMPLIED
00015 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00016 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
00017 
00018 IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTOR(S) BE LIABLE FOR ANY DIRECT,
00019 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00020 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00021 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00022 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
00023 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
00024 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00025 */
00026 // LICENSEHEADER_END
00027 namespace QCA { // WRAPNS_LINE
00028 /*************************************************
00029 * Bit/Word Operations Header File                *
00030 * (C) 1999-2007 The Botan Project                *
00031 *************************************************/
00032 
00033 #ifndef BOTAN_BIT_OPS_H__
00034 #define BOTAN_BIT_OPS_H__
00035 
00036 } // WRAPNS_LINE
00037 #include <botan/types.h>
00038 namespace QCA { // WRAPNS_LINE
00039 
00040 namespace Botan {
00041 
00042 /*************************************************
00043 * Rotation Functions                             *
00044 *************************************************/
00045 template<typename T> inline T rotate_left(T input, u32bit rot)
00046    { return (T)((input << rot) | (input >> (8*sizeof(T)-rot))); }
00047 
00048 template<typename T> inline T rotate_right(T input, u32bit rot)
00049    { return (T)((input >> rot) | (input << (8*sizeof(T)-rot))); }
00050 
00051 /*************************************************
00052 * Byte Extraction Function                       *
00053 *************************************************/
00054 template<typename T> inline byte get_byte(u32bit byte_num, T input)
00055    { return (byte)(input >> ((sizeof(T)-1-(byte_num&(sizeof(T)-1))) << 3)); }
00056 
00057 /*************************************************
00058 * Byte to Word Conversions                       *
00059 *************************************************/
00060 inline u16bit make_u16bit(byte input0, byte input1)
00061    { return (u16bit)(((u16bit)input0 << 8) | input1); }
00062 
00063 inline u32bit make_u32bit(byte input0, byte input1, byte input2, byte input3)
00064    { return (u32bit)(((u32bit)input0 << 24) | ((u32bit)input1 << 16) |
00065                      ((u32bit)input2 <<  8) | input3); }
00066 
00067 inline u64bit make_u64bit(byte input0, byte input1, byte input2, byte input3,
00068                           byte input4, byte input5, byte input6, byte input7)
00069    {
00070    return (u64bit)(((u64bit)input0 << 56) | ((u64bit)input1 << 48) |
00071                    ((u64bit)input2 << 40) | ((u64bit)input3 << 32) |
00072                    ((u64bit)input4 << 24) | ((u64bit)input5 << 16) |
00073                    ((u64bit)input6 <<  8) | input7);
00074    }
00075 
00076 /*************************************************
00077 * XOR Functions                                  *
00078 *************************************************/
00079 void xor_buf(byte[], const byte[], u32bit);
00080 void xor_buf(byte[], const byte[], const byte[], u32bit);
00081 
00082 /*************************************************
00083 * Misc Utility Functions                         *
00084 *************************************************/
00085 bool power_of_2(u64bit);
00086 u32bit high_bit(u64bit);
00087 u32bit low_bit(u64bit);
00088 u32bit significant_bytes(u64bit);
00089 u32bit hamming_weight(u64bit);
00090 
00091 }
00092 
00093 #endif
00094 } // WRAPNS_LINE
qca

bit_ops.h

qca

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