--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nss/lib/dbm/include/hash.h	Tue Aug 05 18:32:02 2014 +0200
@@ -0,0 +1,335 @@
+/*-
+ * 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. ***REMOVED*** - see 
+ *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
+ * 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.
+ *
+ *	@(#)hash.h	8.3 (Berkeley) 5/31/94
+ */
+
+/* Operations */
+
+#include <stdio.h>
+#include "mcom_db.h"
+typedef enum {
+	HASH_GET, HASH_PUT, HASH_PUTNEW, HASH_DELETE, HASH_FIRST, HASH_NEXT
+} ACTION;
+
+/* Buffer Management structures */
+typedef struct _bufhead BUFHEAD;
+
+struct _bufhead {
+	BUFHEAD		*prev;		/* LRU links */
+	BUFHEAD		*next;		/* LRU links */
+	BUFHEAD		*ovfl;		/* Overflow page buffer header */
+	uint32	 	addr;		/* Address of this page */
+	char		*page;		/* Actual page data */
+	char     	is_disk;
+	char	 	flags;
+#define	BUF_MOD		0x0001
+#define BUF_DISK	0x0002
+#define	BUF_BUCKET	0x0004
+#define	BUF_PIN		0x0008
+};
+
+#define IS_BUCKET(X)	((X) & BUF_BUCKET)
+
+typedef BUFHEAD **SEGMENT;
+
+typedef int DBFILE_PTR;
+#define NO_FILE -1
+#ifdef macintosh
+#define DBFILE_OPEN(path, flag,mode) open((path), flag)
+#define EXISTS(path)
+#else
+#define DBFILE_OPEN(path, flag,mode) open((path), (flag), (mode))
+#endif
+/* Hash Table Information */
+typedef struct hashhdr {		/* Disk resident portion */
+	int32		magic;		/* Magic NO for hash tables */
+	int32		version;	/* Version ID */
+	uint32		lorder;		/* Byte Order */
+	int32		bsize;		/* Bucket/Page Size */
+	int32		bshift;		/* Bucket shift */
+	int32		dsize;		/* Directory Size */
+	int32		ssize;		/* Segment Size */
+	int32		sshift;		/* Segment shift */
+	int32		ovfl_point;	/* Where overflow pages are being 
+					 * allocated */
+	int32		last_freed;	/* Last overflow page freed */
+	int32		max_bucket;	/* ID of Maximum bucket in use */
+	int32		high_mask;	/* Mask to modulo into entire table */
+	int32		low_mask;	/* Mask to modulo into lower half of 
+					 * table */
+	int32		ffactor;	/* Fill factor */
+	int32		nkeys;		/* Number of keys in hash table */
+	int32		hdrpages;	/* Size of table header */
+	uint32		h_charkey;	/* value of hash(CHARKEY) */
+#define NCACHED	32			/* number of bit maps and spare 
+					 * points */
+	int32		spares[NCACHED];/* spare pages for overflow */
+	uint16		bitmaps[NCACHED];	/* address of overflow page 
+						 * bitmaps */
+} HASHHDR;
+
+typedef struct htab	 {		/* Memory resident data structure */
+	HASHHDR 	hdr;		/* Header */
+	int		nsegs;		/* Number of allocated segments */
+	int		exsegs;		/* Number of extra allocated 
+					 * segments */
+	uint32			/* Hash function */
+	    (*hash)(const void *, size_t);
+	int		flags;		/* Flag values */
+	DBFILE_PTR	fp;		/* File pointer */
+	char            *filename;
+	char		*tmp_buf;	/* Temporary Buffer for BIG data */
+	char		*tmp_key;	/* Temporary Buffer for BIG keys */
+	BUFHEAD 	*cpage;		/* Current page */
+	int		cbucket;	/* Current bucket */
+	int		cndx;		/* Index of next item on cpage */
+	int		dbmerrno;		/* Error Number -- for DBM 
+					 * compatability */
+	int		new_file;	/* Indicates if fd is backing store 
+					 * or no */
+	int		save_file;	/* Indicates whether we need to flush 
+					 * file at
+					 * exit */
+	uint32		*mapp[NCACHED];	/* Pointers to page maps */
+	int		nmaps;		/* Initial number of bitmaps */
+	int		nbufs;		/* Number of buffers left to 
+					 * allocate */
+	BUFHEAD 	bufhead;	/* Header of buffer lru list */
+	SEGMENT 	*dir;		/* Hash Bucket directory */
+	off_t		file_size;	/* in bytes */
+	char		is_temp;	/* unlink file on close */
+	char		updateEOF;	/* force EOF update on flush */
+} HTAB;
+
+/*
+ * Constants
+ */
+#define DATABASE_CORRUPTED_ERROR -999   /* big ugly abort, delete database */
+#define	OLD_MAX_BSIZE		65536		/* 2^16 */
+#define MAX_BSIZE       	32l*1024l         /* 2^15 */
+#define MIN_BUFFERS		6
+#define MINHDRSIZE		512
+#define DEF_BUFSIZE		65536l		/* 64 K */
+#define DEF_BUCKET_SIZE		4096
+#define DEF_BUCKET_SHIFT	12		/* log2(BUCKET) */
+#define DEF_SEGSIZE		256
+#define DEF_SEGSIZE_SHIFT	8		/* log2(SEGSIZE)	 */
+#define DEF_DIRSIZE		256
+#define DEF_FFACTOR		65536l
+#define MIN_FFACTOR		4
+#define SPLTMAX			8
+#define CHARKEY			"%$sniglet^&"
+#define NUMKEY			1038583l
+#define BYTE_SHIFT		3
+#define INT_TO_BYTE		2
+#define INT_BYTE_SHIFT		5
+#define ALL_SET			((uint32)0xFFFFFFFF)
+#define ALL_CLEAR		0
+
+#define PTROF(X)	((ptrdiff_t)(X) == BUF_DISK ? 0 : (X))
+#define ISDISK(X)	((X) ? ((ptrdiff_t)(X) == BUF_DISK ? BUF_DISK \
+				: (X)->is_disk) : 0)
+
+#define BITS_PER_MAP	32
+
+/* Given the address of the beginning of a big map, clear/set the nth bit */
+#define CLRBIT(A, N)	((A)[(N)/BITS_PER_MAP] &= ~(1<<((N)%BITS_PER_MAP)))
+#define SETBIT(A, N)	((A)[(N)/BITS_PER_MAP] |= (1<<((N)%BITS_PER_MAP)))
+#define ISSET(A, N)	((A)[(N)/BITS_PER_MAP] & (1<<((N)%BITS_PER_MAP)))
+
+/* Overflow management */
+/*
+ * Overflow page numbers are allocated per split point.  At each doubling of
+ * the table, we can allocate extra pages.  So, an overflow page number has
+ * the top 5 bits indicate which split point and the lower 11 bits indicate
+ * which page at that split point is indicated (pages within split points are
+ * numberered starting with 1).
+ */
+
+#define SPLITSHIFT	11
+#define SPLITMASK	0x7FF
+#define SPLITNUM(N)	(((uint32)(N)) >> SPLITSHIFT)
+#define OPAGENUM(N)	((N) & SPLITMASK)
+#define	OADDR_OF(S,O)	((uint32)((uint32)(S) << SPLITSHIFT) + (O))
+
+#define BUCKET_TO_PAGE(B) \
+	(B) + hashp->HDRPAGES + ((B) ? hashp->SPARES[__log2((uint32)((B)+1))-1] : 0)
+#define OADDR_TO_PAGE(B) 	\
+	BUCKET_TO_PAGE ( (1 << SPLITNUM((B))) -1 ) + OPAGENUM((B));
+
+/*
+ * page.h contains a detailed description of the page format.
+ *
+ * Normally, keys and data are accessed from offset tables in the top of
+ * each page which point to the beginning of the key and data.  There are
+ * four flag values which may be stored in these offset tables which indicate
+ * the following:
+ *
+ *
+ * OVFLPAGE	Rather than a key data pair, this pair contains
+ *		the address of an overflow page.  The format of
+ *		the pair is:
+ *		    OVERFLOW_PAGE_NUMBER OVFLPAGE
+ *
+ * PARTIAL_KEY	This must be the first key/data pair on a page
+ *		and implies that page contains only a partial key.
+ *		That is, the key is too big to fit on a single page
+ *		so it starts on this page and continues on the next.
+ *		The format of the page is:
+ *		    KEY_OFF PARTIAL_KEY OVFL_PAGENO OVFLPAGE
+ *		
+ *		    KEY_OFF -- offset of the beginning of the key
+ *		    PARTIAL_KEY -- 1
+ *		    OVFL_PAGENO - page number of the next overflow page
+ *		    OVFLPAGE -- 0
+ *
+ * FULL_KEY	This must be the first key/data pair on the page.  It
+ *		is used in two cases.
+ *
+ *		Case 1:
+ *		    There is a complete key on the page but no data
+ *		    (because it wouldn't fit).  The next page contains
+ *		    the data.
+ *
+ *		    Page format it:
+ *		    KEY_OFF FULL_KEY OVFL_PAGENO OVFL_PAGE
+ *
+ *		    KEY_OFF -- offset of the beginning of the key
+ *		    FULL_KEY -- 2
+ *		    OVFL_PAGENO - page number of the next overflow page
+ *		    OVFLPAGE -- 0
+ *
+ *		Case 2:
+ *		    This page contains no key, but part of a large
+ *		    data field, which is continued on the next page.
+ *
+ *		    Page format it:
+ *		    DATA_OFF FULL_KEY OVFL_PAGENO OVFL_PAGE
+ *
+ *		    KEY_OFF -- offset of the beginning of the data on
+ *				this page
+ *		    FULL_KEY -- 2
+ *		    OVFL_PAGENO - page number of the next overflow page
+ *		    OVFLPAGE -- 0
+ *
+ * FULL_KEY_DATA 
+ *		This must be the first key/data pair on the page.
+ *		There are two cases:
+ *
+ *		Case 1:
+ *		    This page contains a key and the beginning of the
+ *		    data field, but the data field is continued on the
+ *		    next page.
+ *
+ *		    Page format is:
+ *		    KEY_OFF FULL_KEY_DATA OVFL_PAGENO DATA_OFF
+ *
+ *		    KEY_OFF -- offset of the beginning of the key
+ *		    FULL_KEY_DATA -- 3
+ *		    OVFL_PAGENO - page number of the next overflow page
+ *		    DATA_OFF -- offset of the beginning of the data
+ *
+ *		Case 2:
+ *		    This page contains the last page of a big data pair.
+ *		    There is no key, only the  tail end of the data
+ *		    on this page.
+ *
+ *		    Page format is:
+ *		    DATA_OFF FULL_KEY_DATA <OVFL_PAGENO> <OVFLPAGE>
+ *
+ *		    DATA_OFF -- offset of the beginning of the data on
+ *				this page
+ *		    FULL_KEY_DATA -- 3
+ *		    OVFL_PAGENO - page number of the next overflow page
+ *		    OVFLPAGE -- 0
+ *
+ *		    OVFL_PAGENO and OVFLPAGE are optional (they are
+ *		    not present if there is no next page).
+ */
+
+#define OVFLPAGE	0
+#define PARTIAL_KEY	1
+#define FULL_KEY	2
+#define FULL_KEY_DATA	3
+#define	REAL_KEY	4
+
+/* Short hands for accessing structure */
+#undef BSIZE
+#define BSIZE		hdr.bsize
+#undef BSHIFT
+#define BSHIFT		hdr.bshift
+#define DSIZE		hdr.dsize
+#define SGSIZE		hdr.ssize
+#define SSHIFT		hdr.sshift
+#define LORDER		hdr.lorder
+#define OVFL_POINT	hdr.ovfl_point
+#define	LAST_FREED	hdr.last_freed
+#define MAX_BUCKET	hdr.max_bucket
+#define FFACTOR		hdr.ffactor
+#define HIGH_MASK	hdr.high_mask
+#define LOW_MASK	hdr.low_mask
+#define NKEYS		hdr.nkeys
+#define HDRPAGES	hdr.hdrpages
+#define SPARES		hdr.spares
+#define BITMAPS		hdr.bitmaps
+#define VERSION		hdr.version
+#define MAGIC		hdr.magic
+#define NEXT_FREE	hdr.next_free
+#define H_CHARKEY	hdr.h_charkey
+
+extern uint32 (*__default_hash) (const void *, size_t);
+void __buf_init(HTAB *hashp, int32 nbytes);
+int __big_delete(HTAB *hashp, BUFHEAD *bufp);
+BUFHEAD * __get_buf(HTAB *hashp, uint32 addr, BUFHEAD *prev_bp, int newpage);
+uint32 __call_hash(HTAB *hashp, char *k, size_t len);
+#include "page.h"
+extern int __big_split(HTAB *hashp, BUFHEAD *op,BUFHEAD *np,
+BUFHEAD *big_keyp,uint32 addr,uint32   obucket, SPLIT_RETURN *ret);
+void __free_ovflpage(HTAB *hashp, BUFHEAD *obufp);
+BUFHEAD * __add_ovflpage(HTAB *hashp, BUFHEAD *bufp);
+int __big_insert(HTAB *hashp, BUFHEAD *bufp, const DBT *key, const DBT *val);
+int __expand_table(HTAB *hashp);
+uint32 __log2(uint32 num);
+void __reclaim_buf(HTAB *hashp, BUFHEAD *bp);
+int __get_page(HTAB *hashp, char * p, uint32 bucket, int is_bucket, int is_disk, int is_bitmap);
+int __put_page(HTAB *hashp, char *p, uint32 bucket, int is_bucket, int is_bitmap);
+int __ibitmap(HTAB *hashp, int pnum, int nbits, int ndx);
+int __buf_free(HTAB *hashp, int do_free, int to_disk);
+int __find_bigpair(HTAB *hashp, BUFHEAD *bufp, int ndx, char *key, int size);
+uint16 __find_last_page(HTAB *hashp, BUFHEAD **bpp);
+int __addel(HTAB *hashp, BUFHEAD *bufp, const DBT *key, const DBT * val);
+int __big_return(HTAB *hashp, BUFHEAD *bufp, int ndx, DBT *val, int set_current);
+int __delpair(HTAB *hashp, BUFHEAD *bufp, int ndx);
+int __big_keydata(HTAB *hashp, BUFHEAD *bufp, DBT *key, DBT *val, int set);
+int __split_page(HTAB *hashp, uint32 obucket, uint32 nbucket);