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diff --git a/indexer_JPIP/int.c b/indexer_JPIP/int.c
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+/*
+ * Copyright (c) 2001-2002, David Janssens
+ * Copyright (c) 2003, Yannick Verschueren
+ * Copyright (c) 2003,  Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/// <summary>
+/// Get the minimum of two integers.
+/// </summary>
+int int_min(int a, int b) {
+    return a<b?a:b;
+}
+
+/// <summary>
+/// Get the maximum of two integers.
+/// </summary>
+int int_max(int a, int b) {
+    return a>b?a:b;
+}
+
+/// <summary>
+/// Clamp an integer inside an interval.
+/// </summary>
+int int_clamp(int a, int min, int max) {
+    if (a<min) return min;
+    if (a>max) return max;
+    return a;
+}
+
+/// <summary>
+/// Get absolute value of integer.
+/// </summary>
+int int_abs(int a) {
+    return a<0?-a:a;
+}
+
+/// <summary>
+/// Divide an integer and round upwards.
+/// </summary>
+int int_ceildiv(int a, int b) {
+    return (a+b-1)/b;
+}
+
+/// <summary>
+/// Divide an integer by a power of 2 and round upwards.
+/// </summary>
+int int_ceildivpow2(int a, int b) {
+    return (a+(1<<b)-1)>>b;
+}
+
+/// <summary>
+/// Divide an integer by a power of 2 and round downwards.
+/// </summary>
+int int_floordivpow2(int a, int b) {
+    return a>>b;
+}
+
+/// <summary>
+/// Get logarithm of an integer and round downwards.
+/// </summary>
+int int_floorlog2(int a) {
+    int l;
+    for (l=0; a>1; l++) {
+        a>>=1;
+    }
+    return l;
+}