ubbp.h

#ifndef __UBBP_H__
#define __UBBP_H__

/*

   Universal Base Binary Protocol (UBBP) - a universal message header

   Copyright 2010 Red Hat, Inc.

   Permission is hereby granted, free of charge, to any person
   obtaining a copy of this software and associated documentation
   files (the "Software"), to deal in the Software without restriction,
   including without limitation the rights to use, copy, modify, merge,
   publish, distribute, sublicense, and/or sell copies of the Software,
   and to permit persons to whom the Software is furnished to do so,
   subject to the following conditions:

   The above copyright notice and this permission notice shall be
   included in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
   KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
   AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
   IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.

*/


#include <stdint.h>

struct ubbp_header {
	/* magic number of your protocol */
	unsigned char	magic[4];

	/*
	 * size: upper 24 bits (size = op_size >> 8)
	 * op: lower 8 bits (op = op_size & 0xff)
	 *
	 * Byte order: little endian
	 */
	uint32_t	op_size;
};

#define UBBP_OP(op_size) ((op_size) & 0xff)
#define UBBP_SIZE(op_size) ((op_size) >> 8)
#define UBBP_OP_SIZE(op, size) (((op) & 0xff) | ((size) << 8))

#endif /* __UBBP_H__ */