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Annotation of Net2/nfs/nfscompress.h, revision 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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