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/*
* $Id: common.c,v 1.15 2010/02/05 23:50:22 simakov Exp $
*
* EPSILON - wavelet image compression library.
* Copyright (C) 2006,2007,2010 Alexander Simakov, <xander@entropyware.info>
*
* This file is part of EPSILON
*
* EPSILON is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* EPSILON 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with EPSILON. If not, see <http://www.gnu.org/licenses/>.
*
* http://epsilon-project.sourceforge.net
*/
#include <common.h>
int number_of_bits(int value)
{
int bits;
bits = NUMBER_OF_BITS(GET_BYTE(value, 3));
if (bits) return bits + 24;
bits = NUMBER_OF_BITS(GET_BYTE(value, 2));
if (bits) return bits + 16;
bits = NUMBER_OF_BITS(GET_BYTE(value, 1));
if (bits) return bits + 8;
bits = NUMBER_OF_BITS(GET_BYTE(value, 0));
if (bits) return bits;
return 0;
}
int is_power_of_two(int value)
{
return (value == (1 << (number_of_bits(value) - 1)));
}
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