cpack.h

TCPDUMP的C语言源代码,是在数据链路层的应用

/*-
 * Copyright (c) 2003, 2004 David Young.  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.
 * 3. The name of David Young may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``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 DAVID
 * YOUNG 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 _CPACK_H
#define _CPACK_H

struct cpack_state {
	u_int8_t					*c_buf;
	u_int8_t					*c_next;
	size_t						 c_len;
};

int cpack_init(struct cpack_state *, u_int8_t *, size_t);

int cpack_uint8(struct cpack_state *, u_int8_t *);
int cpack_uint16(struct cpack_state *, u_int16_t *);
int cpack_uint32(struct cpack_state *, u_int32_t *);
int cpack_uint64(struct cpack_state *, u_int64_t *);

#define cpack_int8(__s, __p)	cpack_uint8((__s),  (u_int8_t*)(__p))
#define cpack_int16(__s, __p)	cpack_uint16((__s), (u_int16_t*)(__p))
#define cpack_int32(__s, __p)	cpack_uint32((__s), (u_int32_t*)(__p))
#define cpack_int64(__s, __p)	cpack_uint64((__s), (u_int64_t*)(__p))

#endif /* _CPACK_H */