dbm/include/page.h
author chrisk%netscape.com
Tue, 20 Jun 2000 13:24:01 +0000
changeset 381 d748e5f9526290f415abb5815391bde83c5b45f8
parent 0 9949429068caa6bb8827a8ceeaa7c605d722f47f
child 6769 bb44588803a7133cfbbfa197ab7fbff3f2410c1e
permissions -rw-r--r--
Fix bug in decoder: When encoding indefinitely & encountering an optional field at the end of a sequence, right after an IMPLICIT or POINTER template, the decoder was not propagating the optionalness and the end-of-contents condition correctly as it hits the end-of-contents octets instead of the optional field. This is because IMPLICIT and POINTER push TWO states to look for the next tag, not just one. (The first state is "afterImplicit" or "afterPointer", the second one starts with "beforeIdentifier" as usual). This finally makes decoding envelopedData messages in cmsutil work.

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Margo Seltzer.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)page.h	8.2 (Berkeley) 5/31/94
 */

/*
 * Definitions for hashing page file format.
 */

/*
 * routines dealing with a data page
 *
 * page format:
 *	+------------------------------+
 * p	| n | keyoff | datoff | keyoff |
 * 	+------------+--------+--------+
 *	| datoff | free  |  ptr  | --> |
 *	+--------+---------------------+
 *	|	 F R E E A R E A       |
 *	+--------------+---------------+
 *	|  <---- - - - | data          |
 *	+--------+-----+----+----------+
 *	|  key   | data     | key      |
 *	+--------+----------+----------+
 *
 * Pointer to the free space is always:  p[p[0] + 2]
 * Amount of free space on the page is:  p[p[0] + 1]
 */

/*
 * How many bytes required for this pair?
 *	2 shorts in the table at the top of the page + room for the
 *	key and room for the data
 *
 * We prohibit entering a pair on a page unless there is also room to append
 * an overflow page. The reason for this it that you can get in a situation
 * where a single key/data pair fits on a page, but you can't append an
 * overflow page and later you'd have to split the key/data and handle like
 * a big pair.
 * You might as well do this up front.
 */
#ifndef PAGE_H
#define PAGE_H

#define	PAIRSIZE(K,D)	(2*sizeof(uint16) + (K)->size + (D)->size)
#define BIGOVERHEAD	(4*sizeof(uint16))
#define KEYSIZE(K)	(4*sizeof(uint16) + (K)->size);
#define OVFLSIZE	(2*sizeof(uint16))
#define FREESPACE(P)	((P)[(P)[0]+1])
#define	OFFSET(P)	((P)[(P)[0]+2])
#define PAIRFITS(P,K,D) \
	(((P)[2] >= REAL_KEY) && \
	    (PAIRSIZE((K),(D)) + OVFLSIZE) <= FREESPACE((P)))
#define PAGE_META(N)	(((N)+3) * sizeof(uint16))

typedef struct {
	BUFHEAD *newp;
	BUFHEAD *oldp;
	BUFHEAD *nextp;
	uint16 next_addr;
}       SPLIT_RETURN;
#endif