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diff --git a/indexer_JPIP/pi.h b/indexer_JPIP/pi.h
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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.
+ */
+
+#ifndef __PI_H
+#define __PI_H
+
+#include "j2k.h"
+#include "tcd.h"
+
+typedef struct {
+    int pdx, pdy;
+    int pw, ph;
+} pi_resolution_t;
+
+typedef struct {
+    int dx, dy;
+    int numresolutions;
+    pi_resolution_t *resolutions;
+} pi_comp_t;
+
+typedef struct {
+  int include[10][10][3][99];  
+  int compno, resno, precno, layno; // component, resolution, precinct and layer that indentify the packet
+    int first;
+    j2k_poc_t poc;
+    int numcomps;
+    pi_comp_t *comps;
+    int tx0, ty0, tx1, ty1;
+    int x, y, dx, dy;
+} pi_iterator_t; // packet iterator
+
+/*
+ * Create a packet iterator
+ * img: raw image for which the packets will be listed
+ * cp: coding paremeters
+ * tileno: number that identifies the tile for which to list the packets
+ * return value: returns a packet iterator that points to the first packet of the tile
+ */
+pi_iterator_t *pi_create(j2k_image_t *img, j2k_cp_t *cp, int tileno);
+
+/* 
+ * Modify the packet iterator to point to the next packet
+ * pi: packet iterator to modify
+ * return value: returns 0 if pi pointed to the last packet or else returns 1 
+ */
+int pi_next(pi_iterator_t *pi);
+
+#endif