chiark - git - mdw - catacomb/blob - symm/ghash-def.h

   1 /* -*-c-*-
   2  *
   3  * Definitions for generic hash interface
   4  *
   5  * (c) 1999 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 #ifndef CATACOMB_GHASH_DEF_H
  29 #define CATACOMB_GHASH_DEF_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #include <mLib/bits.h>
  38 #include <mLib/sub.h>
  39
  40 #ifndef CATACOMB_ARENA_H
  41 #  include "arena.h"
  42 #endif
  43
  44 #ifndef CATACOMB_GHASH_H
  45 #  include "ghash.h"
  46 #endif
  47
  48 #ifndef CATACOMB_PARANOIA_H
  49 #  include "paranoia.h"
  50 #endif
  51
  52 /*----- Generic hash function interface -----------------------------------*/
  53
  54 /* --- @GHASH_DEF@ --- *
  55  *
  56  * Arguments:   @PRE, pre@ = prefixes for hash function
  57  *
  58  * Use:         Defines the generic hash instance.
  59  */
  60
  61 #define GHASH_DEF(PRE, pre) GHASH_DEFX(PRE, pre, #pre)
  62 #define GHASH_DEFX(PRE, pre, name)                                      \
  63                                                                         \
  64 static const ghash_ops gops_##pre;                                      \
  65                                                                         \
  66 typedef struct gctx_##pre {                                             \
  67   ghash h;                                                              \
  68   pre##_ctx c;                                                          \
  69   octet buf[PRE##_HASHSZ];                                              \
  70 } gctx_##pre;                                                           \
  71                                                                         \
  72 static ghash *ghinit_##pre(void)                                        \
  73 {                                                                       \
  74   gctx_##pre *g = S_CREATE(gctx_##pre);                                 \
  75   g->h.ops = &gops_##pre;                                               \
  76   pre##_init(&g->c);                                                    \
  77   return (&g->h);                                                       \
  78 }                                                                       \
  79                                                                         \
  80 static void ghhash_##pre(ghash *h, const void *p, size_t sz)            \
  81 {                                                                       \
  82   gctx_##pre *g = (gctx_##pre *)h;                                      \
  83   pre##_hash(&g->c, p, sz);                                             \
  84 }                                                                       \
  85                                                                         \
  86 static octet *ghdone_##pre(ghash *h, void *buf)                         \
  87 {                                                                       \
  88   gctx_##pre *g = (gctx_##pre *)h;                                      \
  89   if (!buf)                                                             \
  90     buf = g->buf;                                                       \
  91   pre##_done(&g->c, buf);                                               \
  92   return (buf);                                                         \
  93 }                                                                       \
  94                                                                         \
  95 static void ghdestroy_##pre(ghash *h)                                   \
  96 {                                                                       \
  97   gctx_##pre *g = (gctx_##pre *)h;                                      \
  98   BURN(*g);                                                             \
  99   S_DESTROY(g);                                                         \
 100 }                                                                       \
 101                                                                         \
 102 static ghash *ghcopy_##pre(ghash *h)                                    \
 103 {                                                                       \
 104   gctx_##pre *g = (gctx_##pre *)h;                                      \
 105   gctx_##pre *gg = S_CREATE(gctx_##pre);                                \
 106   memcpy(gg, g, sizeof(gctx_##pre));                                    \
 107   return (&gg->h);                                                      \
 108 }                                                                       \
 109                                                                         \
 110 static const ghash_ops gops_##pre =                                     \
 111   { &pre, ghhash_##pre, ghdone_##pre, ghdestroy_##pre, ghcopy_##pre };  \
 112 const gchash pre = { name, PRE##_HASHSZ, ghinit_##pre, PRE##_BUFSZ };
 113
 114 /*----- That's all, folks -------------------------------------------------*/
 115
 116 #ifdef __cplusplus
 117   }
 118 #endif
 119
 120 #endif