[unix-history] / sys / nfs / nfscompress.h

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	From:	@(#)nfscompress.h	7.2 (Berkeley) 10/2/90
 *	$Id$
 */

#ifndef __h_nfscompress
#define __h_nfscompress 1

/*
 * Definitions for the compression algorithm
 */
#define NFSC_MAX	17
#define	NFSCRL		0xe0
#define	NFSCRLE(a)	(NFSCRL | ((a) - 2))

#define	nfscput(c) \
		if (oleft == 0) { \
			MGET(om, M_WAIT, MT_DATA); \
			if (clget) \
				MCLGET(om, M_WAIT); \
			om->m_len = 0; \
			oleft = M_TRAILINGSPACE(om) - 1; \
			*mp = om; \
			mp = &om->m_next; \
			op = mtod(om, u_char *); \
		} else \
			oleft--; \
		*op++ = (c); \
		om->m_len++; \
		olen++

#define nfscget(c) \
		if (ileft == 0) { \
			do { \
				m = m->m_next; \
			} while (m && m->m_len == 0); \
			if (m) { \
				ileft = m->m_len - 1; \
				ip = mtod(m, u_char *); \
				(c) = *ip++; \
			} else { \
				(c) = '\0'; \
				noteof = 0; \
			} \
		} else { \
			(c) = *ip++; \
			ileft--; \
		}

#endif /* __h_nfscompress */
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Rick Macklem at The University of Guelph.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
a8599e88 RG	36	* From: @(#)nfscompress.h 7.2 (Berkeley) 10/2/90
a8599e88 RG	37	* $Id$
15637ed4 RG	38	*/
15637ed4 RG	39
a8599e88 RG	40	#ifndef __h_nfscompress
	41	#define __h_nfscompress 1
	42
15637ed4 RG	43	/*
	44	* Definitions for the compression algorithm
	45	*/
	46	#define NFSC_MAX 17
	47	#define NFSCRL 0xe0
	48	#define NFSCRLE(a) (NFSCRL \| ((a) - 2))
	49
	50	#define nfscput(c) \
	51	if (oleft == 0) { \
	52	MGET(om, M_WAIT, MT_DATA); \
	53	if (clget) \
	54	MCLGET(om, M_WAIT); \
	55	om->m_len = 0; \
	56	oleft = M_TRAILINGSPACE(om) - 1; \
	57	*mp = om; \
	58	mp = &om->m_next; \
	59	op = mtod(om, u_char *); \
	60	} else \
	61	oleft--; \
	62	*op++ = (c); \
	63	om->m_len++; \
	64	olen++
	65
	66	#define nfscget(c) \
	67	if (ileft == 0) { \
	68	do { \
	69	m = m->m_next; \
	70	} while (m && m->m_len == 0); \
	71	if (m) { \
	72	ileft = m->m_len - 1; \
	73	ip = mtod(m, u_char *); \
	74	(c) = *ip++; \
	75	} else { \
	76	(c) = '\0'; \
	77	noteof = 0; \
	78	} \
	79	} else { \
	80	(c) = *ip++; \
	81	ileft--; \
	82	}
a8599e88 RG	83
a8599e88 RG	84	#endif /* __h_nfscompress */