git.distorted.org.uk Git - u/mdw/catacomb/blob - ghash.h

   1 /* -*-c-*-
   2  *
   3  * $Id: ghash.h,v 1.4 2000/07/03 18:08:24 mdw Exp $
   4  *
   5  * Generic hash function interface
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: ghash.h,v $
  33  * Revision 1.4  2000/07/03 18:08:24  mdw
  34  * Include `bits.h'.
  35  *
  36  * Revision 1.3  2000/07/02 18:27:42  mdw
  37  * (ghash->ops->done): Interface change.  Passing in a null buffer pointer
  38  * uses a buffer internal to the ghash object.  The operation returns the
  39  * address of the buffer it used.  Clients of generic hashes no longer need
  40  * to use dynamically allocated memory for hash results.
  41  *
  42  * Revision 1.2  2000/06/17 11:22:17  mdw
  43  * Minor changes in the generic hash interface.
  44  *
  45  * Revision 1.1  1999/12/10 23:16:01  mdw
  46  * Generic interface.
  47  *
  48  */
  49
  50 #ifndef CATACOMB_GHASH_H
  51 #define CATACOMB_GHASH_H
  52
  53 #ifdef __cplusplus
  54   extern "C" {
  55 #endif
  56
  57 /*----- Header files ------------------------------------------------------*/
  58
  59 #include <stddef.h>
  60
  61 #include <mLib/bits.h>
  62
  63 /*----- Generic hash function interface -----------------------------------*/
  64
  65 typedef struct ghash {
  66   const struct ghash_ops *ops;          /* Pointer to hash operations */
  67 } ghash;
  68
  69 typedef struct ghash_ops {
  70   const struct gchash *c;               /* Pointer to hash class */
  71   void (*hash)(ghash */*h*/, const void */*p*/, size_t /*sz*/); /* Hash */
  72   octet *(*done)(ghash */*h*/, void */*buf*/); /* Write result */
  73   void (*destroy)(ghash */*h*/);        /* Destroy hash block */
  74 } ghash_ops;
  75
  76 typedef struct gchash {
  77   const char *name;                     /* Name of the hash function */
  78   size_t hashsz;                        /* Size of output hash */
  79   ghash *(*init)(void);                 /* Create a new hash instance */
  80 } gchash;
  81
  82 /*----- That's all, folks -------------------------------------------------*/
  83
  84 #ifdef __cplusplus
  85   }
  86 #endif
  87
  88 #endif