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Annotation of Net2/nfs/nfscompress.h, revision 1.1.1.1

1.1       root        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:  *
                     36:  *     @(#)nfscompress.h       7.2 (Berkeley) 10/2/90
                     37:  */
                     38: 
                     39: /*
                     40:  * Definitions for the compression algorithm
                     41:  */
                     42: #define NFSC_MAX       17
                     43: #define        NFSCRL          0xe0
                     44: #define        NFSCRLE(a)      (NFSCRL | ((a) - 2))
                     45: 
                     46: #define        nfscput(c) \
                     47:                if (oleft == 0) { \
                     48:                        MGET(om, M_WAIT, MT_DATA); \
                     49:                        if (clget) \
                     50:                                MCLGET(om, M_WAIT); \
                     51:                        om->m_len = 0; \
                     52:                        oleft = M_TRAILINGSPACE(om) - 1; \
                     53:                        *mp = om; \
                     54:                        mp = &om->m_next; \
                     55:                        op = mtod(om, u_char *); \
                     56:                } else \
                     57:                        oleft--; \
                     58:                *op++ = (c); \
                     59:                om->m_len++; \
                     60:                olen++
                     61: 
                     62: #define nfscget(c) \
                     63:                if (ileft == 0) { \
                     64:                        do { \
                     65:                                m = m->m_next; \
                     66:                        } while (m && m->m_len == 0); \
                     67:                        if (m) { \
                     68:                                ileft = m->m_len - 1; \
                     69:                                ip = mtod(m, u_char *); \
                     70:                                (c) = *ip++; \
                     71:                        } else { \
                     72:                                (c) = '\0'; \
                     73:                                noteof = 0; \
                     74:                        } \
                     75:                } else { \
                     76:                        (c) = *ip++; \
                     77:                        ileft--; \
                     78:                }

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