NetBSD/sys/nfs/nfscompress.h

79 lines
2.7 KiB
C

/*
* 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.
*
* @(#)nfscompress.h 7.2 (Berkeley) 10/2/90
*/
/*
* 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--; \
}