47 lines
1.3 KiB
C
Executable File
47 lines
1.3 KiB
C
Executable File
/*
|
|
* misc.c
|
|
*
|
|
* Copyright (C) 2014 Marcos Vives Del Sol <socram8888@gmail.com>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "misc.h"
|
|
|
|
// Reverses the ordering of the bits on an integer
|
|
unsigned long long
|
|
bit_reverse(unsigned long long value,
|
|
unsigned int bits)
|
|
{
|
|
unsigned int out = 0;
|
|
|
|
while (bits--) {
|
|
out = (out << 1) | (value & 1);
|
|
value >>= 1;
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
// Gets "bits" bits from "value" starting "offset" bits from the start
|
|
unsigned long long
|
|
bit_window(unsigned long long value,
|
|
unsigned int offset,
|
|
unsigned int bits)
|
|
{
|
|
unsigned long long mask = (1ULL << bits) - 1;
|
|
value = (value >> offset) & mask;
|
|
return value;
|
|
}
|