1 files changed, 114 insertions, 0 deletions
diff --git a/integer.h b/integer.h
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--- /dev/null
+++ b/integer.h
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+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef INTEGER_H
+#define INTEGER_H
+
+#include "error.h"
+
+/*
+ * min/max functions
+ */
+
+static inline int
+max_int (int x, int y)
+{
+  if (x > y)
+    return x;
+  else
+    return y;
+}
+
+static inline int
+min_int (int x, int y)
+{
+  if (x < y)
+    return x;
+  else
+    return y;
+}
+
+static inline int
+constrain_int (int x, int min, int max)
+{
+  if (min > max)
+    return min;
+  if (x < min)
+    return min;
+  else if (x > max)
+    return max;
+  else
+    return x;
+}
+
+/*
+ * Functions used for circular buffer index arithmetic.
+ */
+
+/*
+ * Return x - y on a circle of circumference mod by shortest path.
+ *
+ * 0 <= x < mod
+ * 0 <= y < mod
+ */
+static inline int
+modulo_subtract(int x, int y, int mod)
+{
+  const int d1 = x - y;
+  const int d2 = (x > y ? -mod : mod) + d1;
+  ASSERT (0 <= x && x < mod && 0 <= y && y < mod);
+  return abs(d1) > abs(d2) ? d2 : d1;
+}
+
+/*
+ * Return x + y on a circle of circumference mod.
+ *
+ * 0 <= x < mod
+ * -mod <= y <= mod
+ */
+static inline int
+modulo_add(int x, int y, int mod)
+{
+  int sum = x + y;
+  ASSERT (0 <= x && x < mod && -mod <= y && y <= mod);
+  if (sum >= mod)
+    sum -= mod;
+  if (sum < 0)
+    sum += mod;
+  return sum;
+}
+
+static inline int
+index_verify (int index, int size, const char *file, int line)
+{
+  if (index < 0 || index >= size)
+    msg (M_FATAL, "Assertion Failed: Array index=%d out of bounds for array size=%d in %s:%d",
+	 index,
+	 size,
+	 file,
+	 line);
+  return index;
+}
+
+#endif