Generic interface.

diff --git a/ghash-def.h b/ghash-def.h
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+/* -*-c-*-
+ *
+ * $Id: ghash-def.h,v 1.1 1999/12/10 23:21:37 mdw Exp $
+ *
+ * Definitions for generic hash interface
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: ghash-def.h,v $
+ * Revision 1.1  1999/12/10 23:21:37  mdw
+ * Generic interface.
+ *
+ */
+
+#ifndef CATACOMB_GHASH_DEF_H
+#define CATACOMB_GHASH_DEF_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+#include <mLib/sub.h>
+
+#ifndef CATACOMB_GHASH_H
+#  include "ghash.h"
+#endif
+
+/*----- Generic hash function interface -----------------------------------*/
+
+/* --- @GHASH_DEF@ --- *
+ *
+ * Arguments:  @PRE, pre@ = prefixes for hash function
+ *
+ * Use:                Defines the generic hash instance.
+ */
+
+#define GHASH_DEF(PRE, pre)                                            \
+                                                                       \
+static const ghash_ops gops;                                           \
+                                                                       \
+typedef struct gctx {                                                  \
+  ghash h;                                                             \
+  pre##_ctx c;                                                         \
+} gctx;                                                                        \
+                                                                       \
+static ghash *ghinit(void)                                             \
+{                                                                      \
+  gctx *g = CREATE(gctx);                                              \
+  g->h.ops = &gops;                                                    \
+  pre##_init(&g->c);                                                   \
+  return (&g->h);                                                      \
+}                                                                      \
+                                                                       \
+static void ghhash(ghash *h, const void *p, size_t sz)                 \
+{                                                                      \
+  gctx *g = (gctx *)h;                                                 \
+  pre##_hash(&g->c, p, sz);                                            \
+}                                                                      \
+                                                                       \
+static void ghdone(ghash *h, void *buf)                                        \
+{                                                                      \
+  gctx *g = (gctx *)h;                                                 \
+  pre##_done(&g->c, buf);                                              \
+}                                                                      \
+                                                                       \
+static void ghdestroy(ghash *h)                                                \
+{                                                                      \
+  gctx *g = (gctx *)h;                                                 \
+  DESTROY(g);                                                          \
+}                                                                      \
+                                                                       \
+static const ghash_ops gops = { &pre.b, ghhash, ghdone, ghdestroy };   \
+const gchash pre = { { #pre, PRE##_HASHSZ }, ghinit };
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif