Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/dbm/include/page.h @ 4:b513267f632f tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 150b72113545
children
rev   line source
3
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
1 /*-
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
2 * Copyright (c) 1990, 1993, 1994
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
3 * The Regents of the University of California. All rights reserved.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
4 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
5 * This code is derived from software contributed to Berkeley by
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
6 * Margo Seltzer.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
7 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
8 * Redistribution and use in source and binary forms, with or without
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
9 * modification, are permitted provided that the following conditions
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
10 * are met:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
11 * 1. Redistributions of source code must retain the above copyright
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
12 * notice, this list of conditions and the following disclaimer.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
13 * 2. Redistributions in binary form must reproduce the above copyright
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
14 * notice, this list of conditions and the following disclaimer in the
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
15 * documentation and/or other materials provided with the distribution.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
16 * 3. ***REMOVED*** - see
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
17 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
18 * 4. Neither the name of the University nor the names of its contributors
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
19 * may be used to endorse or promote products derived from this software
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
20 * without specific prior written permission.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
21 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
32 * SUCH DAMAGE.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
33 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
34 * @(#)page.h 8.2 (Berkeley) 5/31/94
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
35 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
36
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
37 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
38 * Definitions for hashing page file format.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
39 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
40
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
41 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
42 * routines dealing with a data page
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
43 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
44 * page format:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
45 * +------------------------------+
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
46 * p | n | keyoff | datoff | keyoff |
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
47 * +------------+--------+--------+
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
48 * | datoff | free | ptr | --> |
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
49 * +--------+---------------------+
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
50 * | F R E E A R E A |
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
51 * +--------------+---------------+
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
52 * | <---- - - - | data |
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
53 * +--------+-----+----+----------+
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
54 * | key | data | key |
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
55 * +--------+----------+----------+
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
56 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
57 * Pointer to the free space is always: p[p[0] + 2]
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
58 * Amount of free space on the page is: p[p[0] + 1]
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
59 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
60
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
61 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
62 * How many bytes required for this pair?
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
63 * 2 shorts in the table at the top of the page + room for the
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
64 * key and room for the data
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
65 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
66 * We prohibit entering a pair on a page unless there is also room to append
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
67 * an overflow page. The reason for this it that you can get in a situation
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
68 * where a single key/data pair fits on a page, but you can't append an
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
69 * overflow page and later you'd have to split the key/data and handle like
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
70 * a big pair.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
71 * You might as well do this up front.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
72 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
73 #ifndef PAGE_H
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
74 #define PAGE_H
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
75
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
76 #define PAIRSIZE(K,D) (2*sizeof(uint16) + (K)->size + (D)->size)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
77 #define BIGOVERHEAD (4*sizeof(uint16))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
78 #define KEYSIZE(K) (4*sizeof(uint16) + (K)->size);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
79 #define OVFLSIZE (2*sizeof(uint16))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
80 #define FREESPACE(P) ((P)[(P)[0]+1])
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
81 #define OFFSET(P) ((P)[(P)[0]+2])
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
82 #define PAIRFITS(P,K,D) \
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
83 (((P)[2] >= REAL_KEY) && \
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
84 (PAIRSIZE((K),(D)) + OVFLSIZE) <= FREESPACE((P)))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
85 #define PAGE_META(N) (((N)+3) * sizeof(uint16))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
86
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
87 typedef struct {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
88 BUFHEAD *newp;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
89 BUFHEAD *oldp;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
90 BUFHEAD *nextp;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
91 uint16 next_addr;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
92 } SPLIT_RETURN;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
93 #endif
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
94
This site is hosted by Intevation GmbH (Datenschutzerklärung und Impressum | Privacy Policy and Imprint)