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+/*
+ * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
+ * Copyright (c) 2002-2007, Professor Benoit Macq
+ * Copyright (c) 2001-2003, David Janssens
+ * Copyright (c) 2002-2003, Yannick Verschueren
+ * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
+ * Copyright (c) 2005, Herve Drolon, FreeImage Team
+ * 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
+/**
+@file pi.h
+@brief Implementation of a packet iterator (PI)
+
+The functions in PI.C have for goal to realize a packet iterator that permits to get the next
+packet following the progression order and change of it. The functions in PI.C are used
+by some function in T2.C.
+*/
+
+/** @defgroup PI PI - Implementation of a packet iterator */
+/*@{*/
+
+/**
+FIXME: documentation
+*/
+typedef struct opj_pi_resolution {
+  int pdx, pdy;
+  int pw, ph;
+} opj_pi_resolution_t;
+
+/**
+FIXME: documentation
+*/
+typedef struct opj_pi_comp {
+  int dx, dy;
+  /** number of resolution levels */
+  int numresolutions;
+  opj_pi_resolution_t *resolutions;
+} opj_pi_comp_t;
+
+/** 
+Packet iterator 
+*/
+typedef struct opj_pi_iterator {
+        /** Enabling Tile part generation*/
+        char tp_on;
+        /** precise if the packet has been already used (usefull for progression order change) */
+        short int *include;
+        /** layer step used to localize the packet in the include vector */
+        int step_l;
+        /** resolution step used to localize the packet in the include vector */
+        int step_r;     
+        /** component step used to localize the packet in the include vector */
+        int step_c;     
+        /** precinct step used to localize the packet in the include vector */
+        int step_p;     
+        /** component that identify the packet */
+        int compno;
+        /** resolution that identify the packet */
+        int resno;
+        /** precinct that identify the packet */
+        int precno;
+        /** layer that identify the packet */
+        int layno;   
+        /** 0 if the first packet */
+        int first;
+        /** progression order change information */
+        opj_poc_t poc;
+        /** number of components in the image */
+        int numcomps;
+        /** Components*/
+        opj_pi_comp_t *comps;
+        int tx0, ty0, tx1, ty1;
+        int x, y, dx, dy;
+} opj_pi_iterator_t;
+
+/** @name Exported functions */
+/*@{*/
+/* ----------------------------------------------------------------------- */
+/**
+Create a packet iterator for Encoder
+@param image Raw image for which the packets will be listed
+@param cp Coding parameters
+@param tileno Number that identifies the tile for which to list the packets
+@param t2_mode If == 0 In Threshold calculation ,If == 1 Final pass
+@return Returns a packet iterator that points to the first packet of the tile
+@see pi_destroy
+*/
+opj_pi_iterator_t *pi_initialise_encode(opj_image_t *image, opj_cp_t *cp, int tileno,J2K_T2_MODE t2_mode);
+/**
+Modify the packet iterator for enabling tile part generation
+@param pi Handle to the packet iterator generated in pi_initialise_encode  
+@param cp Coding parameters
+@param tileno Number that identifies the tile for which to list the packets
+@param tpnum Tile part number of the current tile
+@param tppos The position of the tile part flag in the progression order
+*/
+void pi_create_encode( opj_pi_iterator_t *pi, opj_cp_t *cp,int tileno, int pino,int tpnum, int tppos);
+/**
+Create a packet iterator for Decoder
+@param image Raw image for which the packets will be listed
+@param cp Coding parameters
+@param tileno Number that identifies the tile for which to list the packets
+@return Returns a packet iterator that points to the first packet of the tile
+@see pi_destroy
+*/
+opj_pi_iterator_t *pi_create_decode(opj_image_t * image, opj_cp_t * cp, int tileno);
+
+/**
+Destroy a packet iterator
+@param pi Previously created packet iterator
+@param cp Coding parameters
+@param tileno Number that identifies the tile for which the packets were listed
+@see pi_create
+*/
+void pi_destroy(opj_pi_iterator_t *pi, opj_cp_t *cp, int tileno);
+
+/**
+Modify the packet iterator to point to the next packet
+@param pi Packet iterator to modify
+@return Returns false if pi pointed to the last packet or else returns true 
+*/
+bool pi_next(opj_pi_iterator_t * pi);
+/* ----------------------------------------------------------------------- */
+/*@}*/
+
+/*@}*/
+
+#endif /* __PI_H */