projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b688fc87 WJ |
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 | } |