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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 |
37 | * $Id$ | |
15637ed4 RG |
38 | */ |
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 | |
84 | #endif /* __h_nfscompress */ |