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From gst...@locus.apache.org
Subject cvs commit: apache-2.0/src/lib/sdbm sdbm_private.h
Date Thu, 13 Jul 2000 10:12:08 GMT
gstein      00/07/13 03:12:08

  Added:       src/lib/sdbm sdbm_private.h
  Log:
  add new file, from Joe Orton's APR-ization of SDBM.
  
  Submitted by: Joe Orton <joe@orton.demon.co.uk>
  Reviewed by: Greg Stein
  
  Revision  Changes    Path
  1.1                  apache-2.0/src/lib/sdbm/sdbm_private.h
  
  Index: sdbm_private.h
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000 The Apache Software Foundation.  All rights
   * reserved.
   *
   * 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. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" must
   *    not be used to endorse or promote products derived from this
   *    software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
   * ITS 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  /*
   * sdbm - ndbm work-alike hashed database library
   * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
   * author: oz@nexus.yorku.ca
   */
  
  #ifndef SDBM_PRIVATE_H
  #define SDBM_PRIVATE_H
  
  #include "apr_errno.h" /* for ap_status_t */
  
  /* increase the block/page size and what can be inserted */
  
  #if 1
  #define DBLKSIZ 16384
  #define PBLKSIZ 8192
  #define PAIRMAX 8008			/* arbitrary on PBLKSIZ-N */
  #else
  #define DBLKSIZ 4096
  #define PBLKSIZ 1024
  #define PAIRMAX 1008			/* arbitrary on PBLKSIZ-N */
  #endif
  #define SPLTMAX	10			/* maximum allowed splits */
  					/* for a single insertion */
  struct SDBM {
      ap_file_t *dirf;		       /* directory file descriptor */
      ap_file_t *pagf;		       /* page file descriptor */
      ap_int32_t flags;		       /* status/error flags, see below */
      long maxbno;		       /* size of dirfile in bits */
      long curbit;		       /* current bit number */
      long hmask;			       /* current hash mask */
      long blkptr;		       /* current block for nextkey */
      int keyptr;			       /* current key for nextkey */
      long blkno;			       /* current page to read/write */
      long pagbno;		       /* current page in pagbuf */
      char pagbuf[PBLKSIZ];	       /* page file block buffer */
      long dirbno;		       /* current block in dirbuf */
      char dirbuf[DBLKSIZ];	       /* directory file block buffer */
  };
  
  ap_status_t sdbm_lock(SDBM *db);
  ap_status_t sdbm_unlock(SDBM *db);
  
  #endif /* SDBM_PRIVATE_H */
  
  
  

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