From 518eb323bcc57e22984f75134a6c6b44876d8dd2 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@leeloo.octo.it>
Date: Thu, 13 Jan 2011 11:03:14 +0100
Subject: [PATCH] src/sn_{network,stage,comparator}.[ch]: Implement
 sn_network_get_hashval() and friends.

---
 src/sn-info.c       |  4 +++-
 src/sn_comparator.c | 10 ++++++++++
 src/sn_comparator.h |  5 +++++
 src/sn_network.c    | 16 ++++++++++++++++
 src/sn_network.h    |  5 +++++
 src/sn_stage.c      | 18 +++++++++++++++++-
 src/sn_stage.h      |  4 ++++
 7 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/src/sn-info.c b/src/sn-info.c
index cf85f89..e2bc9c9 100644
--- a/src/sn-info.c
+++ b/src/sn-info.c
@@ -112,11 +112,13 @@ int main (int argc, char **argv)
       "  Normalized:  %4s\n"
       "  Sorts:    %7s\n"
       "  Rating:      %4i\n"
+      "  Hash:  0x%08"PRIx32"\n"
       "\n",
       comparators_num,
       (normalized ? "yes" : "no"),
       ((inputs_num > 16) ? "unknown" : (sorts ? "yes" : "no")),
-      (stages_num_compressed * inputs_num) + comparators_num);
+      (stages_num_compressed * inputs_num) + comparators_num,
+      sn_network_get_hashval (n));
 
   exit (EXIT_SUCCESS);
 } /* int main */
diff --git a/src/sn_comparator.c b/src/sn_comparator.c
index e404ded..0726504 100644
--- a/src/sn_comparator.c
+++ b/src/sn_comparator.c
@@ -109,4 +109,14 @@ int sn_comparator_compare (const sn_comparator_t *c0,
     return (0);
 } /* int sn_comparator_compare */
 
+uint32_t sn_comparator_get_hashval (const sn_comparator_t *c) /* {{{ */
+{
+  if (c == NULL)
+    return (0);
+
+  /* 100937 and 103319 are some random prime numbers */
+  return ((((uint32_t) c->min) * 100937)
+      + (((uint32_t) c->max) * 103319));
+} /* }}} uint32_t sn_comparator_get_hashval */
+
 /* vim: set shiftwidth=2 softtabstop=2 : */
diff --git a/src/sn_comparator.h b/src/sn_comparator.h
index ba82dcb..db9bc07 100644
--- a/src/sn_comparator.h
+++ b/src/sn_comparator.h
@@ -28,6 +28,9 @@
 #ifndef SN_COMPARATOR_H
 #define SN_COMPARATOR_H 1
 
+#include <stdint.h>
+#include <inttypes.h>
+
 /**
  * Struct representing a comparator. Don't access the members of this struct
  * directly, use the macros below instead.
@@ -114,6 +117,8 @@ void sn_comparator_swap (sn_comparator_t *c, int con0, int con1);
 int sn_comparator_compare (const sn_comparator_t *c0,
     const sn_comparator_t *c1);
 
+uint32_t sn_comparator_get_hashval (const sn_comparator_t *c);
+
 #endif /* SN_COMPARATOR_H */
 
 /* vim: set shiftwidth=2 softtabstop=2 : */
diff --git a/src/sn_network.c b/src/sn_network.c
index 0fdaaa3..2071510 100644
--- a/src/sn_network.c
+++ b/src/sn_network.c
@@ -1171,4 +1171,20 @@ sn_network_t *sn_network_unserialize (char *buffer, /* {{{ */
   return (n);
 } /* }}} sn_network_t *sn_network_unserialize */
 
+uint32_t sn_network_get_hashval (const sn_network_t *n) /* {{{ */
+{
+  uint32_t hash;
+  int i;
+
+  if (n == NULL)
+    return (0);
+
+  hash = (uint32_t) n->inputs_num;
+
+  for (i = 0; i < n->stages_num; i++)
+    hash = (hash * 104207) + sn_stage_get_hashval (n->stages[i]);
+
+  return (hash);
+} /* }}} uint32_t sn_network_get_hashval */
+
 /* vim: set sw=2 sts=2 et fdm=marker : */
diff --git a/src/sn_network.h b/src/sn_network.h
index eb5b2e9..4626d9d 100644
--- a/src/sn_network.h
+++ b/src/sn_network.h
@@ -31,6 +31,8 @@
 #define SN_NETWORK_H 1
 
 #include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
 
 #include "sn_comparator.h"
 #include "sn_stage.h"
@@ -351,6 +353,9 @@ int sn_network_serialize (sn_network_t *n, char **ret_buffer,
  * \see sn_network_serialize
  */
 sn_network_t *sn_network_unserialize (char *buffer, size_t buffer_size);
+
+uint32_t sn_network_get_hashval (const sn_network_t *n);
+
 #endif /* SN_NETWORK_H */
 
 /* vim: set shiftwidth=2 softtabstop=2 : */
diff --git a/src/sn_stage.c b/src/sn_stage.c
index d0d54d7..1b564cc 100644
--- a/src/sn_stage.c
+++ b/src/sn_stage.c
@@ -608,4 +608,20 @@ sn_stage_t *sn_stage_unserialize (char **ret_buffer, size_t *ret_buffer_size)
   return (s);
 } /* sn_stage_t *sn_stage_unserialize */
 
-/* vim: set shiftwidth=2 softtabstop=2 expandtab : */
+uint32_t sn_stage_get_hashval (const sn_stage_t *s) /* {{{ */
+{
+  uint32_t hash;
+  int i;
+
+  if (s == NULL)
+    return (0);
+
+  hash = (uint32_t) s->depth;
+
+  for (i = 0; i < s->comparators_num; i++)
+    hash = (hash * 99991) + sn_comparator_get_hashval (s->comparators + i);
+
+  return (hash);
+} /* }}} uint32_t sn_stage_get_hashval */
+
+/* vim: set shiftwidth=2 softtabstop=2 expandtab fdm=marker : */
diff --git a/src/sn_stage.h b/src/sn_stage.h
index 0e3f3bd..ee51b9f 100644
--- a/src/sn_stage.h
+++ b/src/sn_stage.h
@@ -29,6 +29,8 @@
 #define SN_STAGE_H 1
 
 #include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
 
 #include "sn_comparator.h"
 
@@ -250,6 +252,8 @@ int sn_stage_serialize (sn_stage_t *s,
  */
 sn_stage_t *sn_stage_unserialize (char **buffer, size_t *buffer_size);
 
+uint32_t sn_stage_get_hashval (const sn_stage_t *s);
+
 #endif /* SN_STAGE_H */
 
 /* vim: set shiftwidth=2 softtabstop=2 : */
-- 
2.11.0