CoreFW  Documentation

/*
 * Copyright (c) 2012, Jonathan Schleifer <js@webkeks.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */

#ifndef __COREFW_HASH_H__
#define __COREFW_HASH_H__

#define CFW_HASH_INIT(hash) hash = 0
#define CFW_HASH_ADD(hash, byte)	\
	{				\
		hash += (uint8_t)byte;	\
		hash += (hash << 10);	\
		hash ^= (hash >> 6);	\
	}
#define CFW_HASH_FINALIZE(hash)		\
	{				\
		hash += (hash << 3);	\
		hash ^= (hash >> 11);	\
		hash += (hash << 15);	\
	}
#define CFW_HASH_ADD_HASH(hash, other_)				\
	{							\
		uint32_t other = other_;			\
		CFW_HASH_ADD(hash, (other >> 24) & 0xFF);	\
		CFW_HASH_ADD(hash, (other >> 16) & 0xFF);	\
		CFW_HASH_ADD(hash, (other >>  8) & 0xFF);	\
		CFW_HASH_ADD(hash, other & 0xFF);		\
	}

#endif