/*
 * 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
 * Copyright (c) 2006-2007, Parvatha Elangovan
 * 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.
 */

#include "opj_includes.h"

/** @defgroup PI PI - Implementation of a packet iterator */
/*@{*/

/** @name Local static functions */
/*@{*/

/**
Get next packet in layer-resolution-component-precinct order.
@param pi packet iterator to modify
@return returns false if pi pointed to the last packet or else returns true 
*/
static bool pi_next_lrcp(opj_pi_iterator_t * pi);
/**
Get next packet in resolution-layer-component-precinct order.
@param pi packet iterator to modify
@return returns false if pi pointed to the last packet or else returns true 
*/
static bool pi_next_rlcp(opj_pi_iterator_t * pi);
/**
Get next packet in resolution-precinct-component-layer order.
@param pi packet iterator to modify
@return returns false if pi pointed to the last packet or else returns true 
*/
static bool pi_next_rpcl(opj_pi_iterator_t * pi);
/**
Get next packet in precinct-component-resolution-layer order.
@param pi packet iterator to modify
@return returns false if pi pointed to the last packet or else returns true 
*/
static bool pi_next_pcrl(opj_pi_iterator_t * pi);
/**
Get next packet in component-precinct-resolution-layer order.
@param pi packet iterator to modify
@return returns false if pi pointed to the last packet or else returns true 
*/
static bool pi_next_cprl(opj_pi_iterator_t * pi);

/*@}*/

/*@}*/

/* 
==========================================================
   local functions
==========================================================
*/

static bool pi_next_lrcp(opj_pi_iterator_t * pi) {
	opj_pi_comp_t *comp = NULL;
	opj_pi_resolution_t *res = NULL;
	long index = 0;
	
	if (!pi->first) {
		comp = &pi->comps[pi->compno];
		res = &comp->resolutions[pi->resno];
		goto LABEL_SKIP;
	} else {
		pi->first = 0;
	}

	for (pi->layno = pi->poc.layno0; pi->layno < pi->poc.layno1; pi->layno++) {
		for (pi->resno = pi->poc.resno0; pi->resno < pi->poc.resno1;
		pi->resno++) {
			for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
				comp = &pi->comps[pi->compno];
				if (pi->resno >= comp->numresolutions) {
					continue;
				}
				res = &comp->resolutions[pi->resno];
				if (!pi->tp_on){
					pi->poc.precno1 = res->pw * res->ph;
				}
				for (pi->precno = pi->poc.precno0; pi->precno < pi->poc.precno1; pi->precno++) {
					index = pi->layno * pi->step_l + pi->resno * pi->step_r + pi->compno * pi->step_c + pi->precno * pi->step_p;
					if (!pi->include[index]) {
						pi->include[index] = 1;
						return true;
					}
LABEL_SKIP:;
				}
			}
		}
	}
	
	return false;
}

static bool pi_next_rlcp(opj_pi_iterator_t * pi) {
	opj_pi_comp_t *comp = NULL;
	opj_pi_resolution_t *res = NULL;
	long index = 0;

	if (!pi->first) {
		comp = &pi->comps[pi->compno];
		res = &comp->resolutions[pi->resno];
		goto LABEL_SKIP;
	} else {
		pi->first = 0;
	}

	for (pi->resno = pi->poc.resno0; pi->resno < pi->poc.resno1; pi->resno++) {
		for (pi->layno = pi->poc.layno0; pi->layno < pi->poc.layno1; pi->layno++) {
			for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
				comp = &pi->comps[pi->compno];
				if (pi->resno >= comp->numresolutions) {
					continue;
				}
				res = &comp->resolutions[pi->resno];
				if(!pi->tp_on){
					pi->poc.precno1 = res->pw * res->ph;
				}
				for (pi->precno = pi->poc.precno0; pi->precno < pi->poc.precno1; pi->precno++) {
					index = pi->layno * pi->step_l + pi->resno * pi->step_r + pi->compno * pi->step_c + pi->precno * pi->step_p;
					if (!pi->include[index]) {
						pi->include[index] = 1;
						return true;
					}
LABEL_SKIP:;
				}
			}
		}
	}
	
	return false;
}

static bool pi_next_rpcl(opj_pi_iterator_t * pi) {
	opj_pi_comp_t *comp = NULL;
	opj_pi_resolution_t *res = NULL;
	long index = 0;

	if (!pi->first) {
		goto LABEL_SKIP;
	} else {
		int compno, resno;
		pi->first = 0;
		pi->dx = 0;
		pi->dy = 0;
		for (compno = 0; compno < pi->numcomps; compno++) {
			comp = &pi->comps[compno];
			for (resno = 0; resno < comp->numresolutions; resno++) {
				int dx, dy;
				res = &comp->resolutions[resno];
				dx = comp->dx * (1 << (res->pdx + comp->numresolutions - 1 - resno));
				dy = comp->dy * (1 << (res->pdy + comp->numresolutions - 1 - resno));
				pi->dx = !pi->dx ? dx : int_min(pi->dx, dx);
				pi->dy = !pi->dy ? dy : int_min(pi->dy, dy);
			}
		}
	}
if (!pi->tp_on){
			pi->poc.ty0 = pi->ty0;
			pi->poc.tx0 = pi->tx0;
			pi->poc.ty1 = pi->ty1;
			pi->poc.tx1 = pi->tx1;
		}
	for (pi->resno = pi->poc.resno0; pi->resno < pi->poc.resno1; pi->resno++) {
		for (pi->y = pi->poc.ty0; pi->y < pi->poc.ty1; pi->y += pi->dy - (pi->y % pi->dy)) {
			for (pi->x = pi->poc.tx0; pi->x < pi->poc.tx1; pi->x += pi->dx - (pi->x % pi->dx)) {
				for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
					int levelno;
					int trx0, try0;
					int trx1, try1;
					int rpx, rpy;
					int prci, prcj;
					comp = &pi->comps[pi->compno];
					if (pi->resno >= comp->numresolutions) {
						continue;
					}
					res = &comp->resolutions[pi->resno];
					levelno = comp->numresolutions - 1 - pi->resno;
					trx0 = int_ceildiv(pi->tx0, comp->dx << levelno);
					try0 = int_ceildiv(pi->ty0, comp->dy << levelno);
					trx1 = int_ceildiv(pi->tx1, comp->dx << levelno);
					try1 = int_ceildiv(pi->ty1, comp->dy << levelno);
					rpx = res->pdx + levelno;
					rpy = res->pdy + levelno;
					if (!((pi->y % (comp->dy << rpy) == 0) || ((pi->y == pi->ty0) && ((try0 << levelno) % (1 << rpx))))){
						continue;	
					}
					if (!((pi->x % (comp->dx << rpx) == 0) || ((pi->x == pi->tx0) && ((trx0 << levelno) % (1 << rpx))))){
						continue; 
					}
					
					if ((res->pw==0)||(res->pw==0)) continue;
					
					if ((trx0==trx1)||(try0==try1)) continue;
					
					prci = int_floordivpow2(int_ceildiv(pi->x, comp->dx << levelno), res->pdx) 
						 - int_floordivpow2(trx0, res->pdx);
					prcj = int_floordivpow2(int_ceildiv(pi->y, comp->dy << levelno), res->pdy) 
						 - int_floordivpow2(try0, res->pdy);
					pi->precno = prci + prcj * res->pw;
					for (pi->layno = pi->poc.layno0; pi->layno < pi->poc.layno1; pi->layno++) {
						index = pi->layno * pi->step_l + pi->resno * pi->step_r + pi->compno * pi->step_c + pi->precno * pi->step_p;
						if (!pi->include[index]) {
							pi->include[index] = 1;
							return true;
						}
LABEL_SKIP:;
					}
				}
			}
		}
	}
	
	return false;
}

static bool pi_next_pcrl(opj_pi_iterator_t * pi) {
	opj_pi_comp_t *comp = NULL;
	opj_pi_resolution_t *res = NULL;
	long index = 0;

	if (!pi->first) {
		comp = &pi->comps[pi->compno];
		goto LABEL_SKIP;
	} else {
		int compno, resno;
		pi->first = 0;
		pi->dx = 0;
		pi->dy = 0;
		for (compno = 0; compno < pi->numcomps; compno++) {
			comp = &pi->comps[compno];
			for (resno = 0; resno < comp->numresolutions; resno++) {
				int dx, dy;
				res = &comp->resolutions[resno];
				dx = comp->dx * (1 << (res->pdx + comp->numresolutions - 1 - resno));
				dy = comp->dy * (1 << (res->pdy + comp->numresolutions - 1 - resno));
				pi->dx = !pi->dx ? dx : int_min(pi->dx, dx);
				pi->dy = !pi->dy ? dy : int_min(pi->dy, dy);
			}
		}
	}
	if (!pi->tp_on){
			pi->poc.ty0 = pi->ty0;
			pi->poc.tx0 = pi->tx0;
			pi->poc.ty1 = pi->ty1;
			pi->poc.tx1 = pi->tx1;
		}
	for (pi->y = pi->poc.ty0; pi->y < pi->poc.ty1; pi->y += pi->dy - (pi->y % pi->dy)) {
		for (pi->x = pi->poc.tx0; pi->x < pi->poc.tx1; pi->x += pi->dx - (pi->x % pi->dx)) {
			for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
				comp = &pi->comps[pi->compno];
				for (pi->resno = pi->poc.resno0; pi->resno < int_min(pi->poc.resno1, comp->numresolutions); pi->resno++) {
					int levelno;
					int trx0, try0;
					int trx1, try1;
					int rpx, rpy;
					int prci, prcj;
					res = &comp->resolutions[pi->resno];
					levelno = comp->numresolutions - 1 - pi->resno;
					trx0 = int_ceildiv(pi->tx0, comp->dx << levelno);
					try0 = int_ceildiv(pi->ty0, comp->dy << levelno);
					trx1 = int_ceildiv(pi->tx1, comp->dx << levelno);
					try1 = int_ceildiv(pi->ty1, comp->dy << levelno);
					rpx = res->pdx + levelno;
					rpy = res->pdy + levelno;
					if (!((pi->y % (comp->dy << rpy) == 0) || ((pi->y == pi->ty0) && ((try0 << levelno) % (1 << rpx))))){
						continue;	
					}
					if (!((pi->x % (comp->dx << rpx) == 0) || ((pi->x == pi->tx0) && ((trx0 << levelno) % (1 << rpx))))){
						continue; 
					}
					
					if ((res->pw==0)||(res->pw==0)) continue;
					
					if ((trx0==trx1)||(try0==try1)) continue;
					
					prci = int_floordivpow2(int_ceildiv(pi->x, comp->dx << levelno), res->pdx) 
						 - int_floordivpow2(trx0, res->pdx);
					prcj = int_floordivpow2(int_ceildiv(pi->y, comp->dy << levelno), res->pdy) 
						 - int_floordivpow2(try0, res->pdy);
					pi->precno = prci + prcj * res->pw;
					for (pi->layno = pi->poc.layno0; pi->layno < pi->poc.layno1; pi->layno++) {
						index = pi->layno * pi->step_l + pi->resno * pi->step_r + pi->compno * pi->step_c + pi->precno * pi->step_p;
						if (!pi->include[index]) {
							pi->include[index] = 1;
							return true;
						}	
LABEL_SKIP:;
					}
				}
			}
		}
	}
	
	return false;
}

static bool pi_next_cprl(opj_pi_iterator_t * pi) {
	opj_pi_comp_t *comp = NULL;
	opj_pi_resolution_t *res = NULL;
	long index = 0;

	if (!pi->first) {
		comp = &pi->comps[pi->compno];
		goto LABEL_SKIP;
	} else {
		pi->first = 0;
	}

	for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
		int resno;
		comp = &pi->comps[pi->compno];
		pi->dx = 0;
		pi->dy = 0;
		for (resno = 0; resno < comp->numresolutions; resno++) {
			int dx, dy;
			res = &comp->resolutions[resno];
			dx = comp->dx * (1 << (res->pdx + comp->numresolutions - 1 - resno));
			dy = comp->dy * (1 << (res->pdy + comp->numresolutions - 1 - resno));
			pi->dx = !pi->dx ? dx : int_min(pi->dx, dx);
			pi->dy = !pi->dy ? dy : int_min(pi->dy, dy);
		}
		if (!pi->tp_on){
			pi->poc.ty0 = pi->ty0;
			pi->poc.tx0 = pi->tx0;
			pi->poc.ty1 = pi->ty1;
			pi->poc.tx1 = pi->tx1;
		}
		for (pi->y = pi->poc.ty0; pi->y < pi->poc.ty1; pi->y += pi->dy - (pi->y % pi->dy)) {
			for (pi->x = pi->poc.tx0; pi->x < pi->poc.tx1; pi->x += pi->dx - (pi->x % pi->dx)) {
				for (pi->resno = pi->poc.resno0; pi->resno < int_min(pi->poc.resno1, comp->numresolutions); pi->resno++) {
					int levelno;
					int trx0, try0;
					int trx1, try1;
					int rpx, rpy;
					int prci, prcj;
					res = &comp->resolutions[pi->resno];
					levelno = comp->numresolutions - 1 - pi->resno;
					trx0 = int_ceildiv(pi->tx0, comp->dx << levelno);
					try0 = int_ceildiv(pi->ty0, comp->dy << levelno);
					trx1 = int_ceildiv(pi->tx1, comp->dx << levelno);
					try1 = int_ceildiv(pi->ty1, comp->dy << levelno);
					rpx = res->pdx + levelno;
					rpy = res->pdy + levelno;
					if (!((pi->y % (comp->dy << rpy) == 0) || ((pi->y == pi->ty0) && ((try0 << levelno) % (1 << rpx))))){
						continue;	
					}
					if (!((pi->x % (comp->dx << rpx) == 0) || ((pi->x == pi->tx0) && ((trx0 << levelno) % (1 << rpx))))){
						continue; 
					}
					
					if ((res->pw==0)||(res->pw==0)) continue;
					
					if ((trx0==trx1)||(try0==try1)) continue;
					
					prci = int_floordivpow2(int_ceildiv(pi->x, comp->dx << levelno), res->pdx) 
						 - int_floordivpow2(trx0, res->pdx);
					prcj = int_floordivpow2(int_ceildiv(pi->y, comp->dy << levelno), res->pdy) 
						 - int_floordivpow2(try0, res->pdy);
					pi->precno = prci + prcj * res->pw;
					for (pi->layno = pi->poc.layno0; pi->layno < pi->poc.layno1; pi->layno++) {
						index = pi->layno * pi->step_l + pi->resno * pi->step_r + pi->compno * pi->step_c + pi->precno * pi->step_p;
						if (!pi->include[index]) {
							pi->include[index] = 1;
							return true;
						}
LABEL_SKIP:;
					}
				}
			}
		}
	}
	
	return false;
}

/* 
==========================================================
   Packet iterator interface
==========================================================
*/

opj_pi_iterator_t *pi_create_decode(opj_image_t *image, opj_cp_t *cp, int tileno) {
	int p, q;
	int compno, resno, pino;
	opj_pi_iterator_t *pi = NULL;
	opj_tcp_t *tcp = NULL;
	opj_tccp_t *tccp = NULL;
	size_t array_size;
	
	tcp = &cp->tcps[tileno];

	array_size = (tcp->numpocs + 1) * sizeof(opj_pi_iterator_t);
	pi = (opj_pi_iterator_t *) opj_malloc(array_size);
	if(!pi) {
		/* TODO: throw an error */
		return NULL;
	}
	
	for (pino = 0; pino < tcp->numpocs + 1; pino++) {	/* change */
		int maxres = 0;
		int maxprec = 0;
		p = tileno % cp->tw;
		q = tileno / cp->tw;

		pi[pino].tx0 = int_max(cp->tx0 + p * cp->tdx, image->x0);
		pi[pino].ty0 = int_max(cp->ty0 + q * cp->tdy, image->y0);
		pi[pino].tx1 = int_min(cp->tx0 + (p + 1) * cp->tdx, image->x1);
		pi[pino].ty1 = int_min(cp->ty0 + (q + 1) * cp->tdy, image->y1);
		pi[pino].numcomps = image->numcomps;

		array_size = image->numcomps * sizeof(opj_pi_comp_t);
		pi[pino].comps = (opj_pi_comp_t *) opj_malloc(array_size);
		if(!pi[pino].comps) {
			/* TODO: throw an error */
			pi_destroy(pi, cp, tileno);
			return NULL;
		}
		memset(pi[pino].comps, 0, array_size);
		
		for (compno = 0; compno < pi->numcomps; compno++) {
			int tcx0, tcy0, tcx1, tcy1;
			opj_pi_comp_t *comp = &pi[pino].comps[compno];
			tccp = &tcp->tccps[compno];
			comp->dx = image->comps[compno].dx;
			comp->dy = image->comps[compno].dy;
			comp->numresolutions = tccp->numresolutions;

			array_size = comp->numresolutions * sizeof(opj_pi_resolution_t);
			comp->resolutions =	(opj_pi_resolution_t *) opj_malloc(array_size);
			if(!comp->resolutions) {
				/* TODO: throw an error */
				pi_destroy(pi, cp, tileno);
				return NULL;
			}

			tcx0 = int_ceildiv(pi->tx0, comp->dx);
			tcy0 = int_ceildiv(pi->ty0, comp->dy);
			tcx1 = int_ceildiv(pi->tx1, comp->dx);
			tcy1 = int_ceildiv(pi->ty1, comp->dy);
			if (comp->numresolutions > maxres) {
				maxres = comp->numresolutions;
			}

			for (resno = 0; resno < comp->numresolutions; resno++) {
				int levelno;
				int rx0, ry0, rx1, ry1;
				int px0, py0, px1, py1;
				opj_pi_resolution_t *res = &comp->resolutions[resno];
				if (tccp->csty & J2K_CCP_CSTY_PRT) {
					res->pdx = tccp->prcw[resno];
					res->pdy = tccp->prch[resno];
				} else {
					res->pdx = 15;
					res->pdy = 15;
				}
				levelno = comp->numresolutions - 1 - resno;
				rx0 = int_ceildivpow2(tcx0, levelno);
				ry0 = int_ceildivpow2(tcy0, levelno);
				rx1 = int_ceildivpow2(tcx1, levelno);
				ry1 = int_ceildivpow2(tcy1, levelno);
				px0 = int_floordivpow2(rx0, res->pdx) << res->pdx;
				py0 = int_floordivpow2(ry0, res->pdy) << res->pdy;
				px1 = int_ceildivpow2(rx1, res->pdx) << res->pdx;
				py1 = int_ceildivpow2(ry1, res->pdy) << res->pdy;
				res->pw = (rx0==rx1)?0:((px1 - px0) >> res->pdx);
				res->ph = (ry0==ry1)?0:((py1 - py0) >> res->pdy);
				
				if (res->pw*res->ph > maxprec) {
					maxprec = res->pw*res->ph;
				}
				
			}
		}
		
		tccp = &tcp->tccps[0];
		pi[pino].step_p = 1;
		pi[pino].step_c = maxprec * pi[pino].step_p;
		pi[pino].step_r = image->numcomps * pi[pino].step_c;
		pi[pino].step_l = maxres * pi[pino].step_r;
		
		if (pino == 0) {
			array_size = image->numcomps * maxres * tcp->numlayers * maxprec * sizeof(short int);
			pi[pino].include = (short int *) opj_malloc(array_size);
			if(!pi[pino].include) {
				/* TODO: throw an error */
				pi_destroy(pi, cp, tileno);
				return NULL;
			}
		}
		else {
			pi[pino].include = pi[pino - 1].include;
		}
		
		if (tcp->POC == 0) {
			pi[pino].first = 1;
			pi[pino].poc.resno0 = 0;
			pi[pino].poc.compno0 = 0;
			pi[pino].poc.layno1 = tcp->numlayers;
			pi[pino].poc.resno1 = maxres;
			pi[pino].poc.compno1 = image->numcomps;
			pi[pino].poc.prg = tcp->prg;
		} else {
			pi[pino].first = 1;
			pi[pino].poc.resno0 = tcp->pocs[pino].resno0;
			pi[pino].poc.compno0 = tcp->pocs[pino].compno0;
			pi[pino].poc.layno1 = tcp->pocs[pino].layno1;
			pi[pino].poc.resno1 = tcp->pocs[pino].resno1;
			pi[pino].poc.compno1 = tcp->pocs[pino].compno1;
			pi[pino].poc.prg = tcp->pocs[pino].prg;
		}
		pi[pino].poc.layno0  = 0;
		pi[pino].poc.precno0 = 0; 
		pi[pino].poc.precno1 = maxprec;
			
	}
	
	return pi;
}


opj_pi_iterator_t *pi_initialise_encode(opj_image_t *image, opj_cp_t *cp, int tileno, J2K_T2_MODE t2_mode){ 
	int p, q, pino;
	int compno, resno;
	int maxres = 0;
	int maxprec = 0;
	opj_pi_iterator_t *pi = NULL;
	opj_tcp_t *tcp = NULL;
	opj_tccp_t *tccp = NULL;
	size_t array_size;
	
	tcp = &cp->tcps[tileno];

	array_size = (tcp->numpocs + 1) * sizeof(opj_pi_iterator_t);
	pi = (opj_pi_iterator_t *) opj_malloc(array_size);
	if(!pi) {	return NULL;}
	pi->tp_on = cp->tp_on;
	
	for(pino = 0;pino < tcp->numpocs+1 ; pino ++){
		p = tileno % cp->tw;
		q = tileno / cp->tw;

		pi[pino].tx0 = int_max(cp->tx0 + p * cp->tdx, image->x0);
		pi[pino].ty0 = int_max(cp->ty0 + q * cp->tdy, image->y0);
		pi[pino].tx1 = int_min(cp->tx0 + (p + 1) * cp->tdx, image->x1);
		pi[pino].ty1 = int_min(cp->ty0 + (q + 1) * cp->tdy, image->y1);
		pi[pino].numcomps = image->numcomps;
		
		array_size = image->numcomps * sizeof(opj_pi_comp_t);
		pi[pino].comps = (opj_pi_comp_t *) opj_malloc(array_size);
		if(!pi[pino].comps) {
			pi_destroy(pi, cp, tileno);
			return NULL;
		}
		memset(pi[pino].comps, 0, array_size);
		
		for (compno = 0; compno < pi[pino].numcomps; compno++) {
			int tcx0, tcy0, tcx1, tcy1;
			opj_pi_comp_t *comp = &pi[pino].comps[compno];
			tccp = &tcp->tccps[compno];
			comp->dx = image->comps[compno].dx;
			comp->dy = image->comps[compno].dy;
			comp->numresolutions = tccp->numresolutions;

			array_size = comp->numresolutions * sizeof(opj_pi_resolution_t);
			comp->resolutions =	(opj_pi_resolution_t *) opj_malloc(array_size);
			if(!comp->resolutions) {
				pi_destroy(pi, cp, tileno);
				return NULL;
			}

			tcx0 = int_ceildiv(pi[pino].tx0, comp->dx);
			tcy0 = int_ceildiv(pi[pino].ty0, comp->dy);
			tcx1 = int_ceildiv(pi[pino].tx1, comp->dx);
			tcy1 = int_ceildiv(pi[pino].ty1, comp->dy);
			if (comp->numresolutions > maxres) {
				maxres = comp->numresolutions;
			}

			for (resno = 0; resno < comp->numresolutions; resno++) {
				int levelno;
				int rx0, ry0, rx1, ry1;
				int px0, py0, px1, py1;
				opj_pi_resolution_t *res = &comp->resolutions[resno];
				if (tccp->csty & J2K_CCP_CSTY_PRT) {
					res->pdx = tccp->prcw[resno];
					res->pdy = tccp->prch[resno];
				} else {
					res->pdx = 15;
					res->pdy = 15;
				}
				levelno = comp->numresolutions - 1 - resno;
				rx0 = int_ceildivpow2(tcx0, levelno);
				ry0 = int_ceildivpow2(tcy0, levelno);
				rx1 = int_ceildivpow2(tcx1, levelno);
				ry1 = int_ceildivpow2(tcy1, levelno);
				px0 = int_floordivpow2(rx0, res->pdx) << res->pdx;
				py0 = int_floordivpow2(ry0, res->pdy) << res->pdy;
				px1 = int_ceildivpow2(rx1, res->pdx) << res->pdx;
				py1 = int_ceildivpow2(ry1, res->pdy) << res->pdy;
				res->pw = (rx0==rx1)?0:((px1 - px0) >> res->pdx);
				res->ph = (ry0==ry1)?0:((py1 - py0) >> res->pdy);

				if (res->pw*res->ph > maxprec) {
					maxprec = res->pw * res->ph;
				}
			}
		}
		
		tccp = &tcp->tccps[0];
		pi[pino].step_p = 1;
		pi[pino].step_c = maxprec * pi[pino].step_p;
		pi[pino].step_r = image->numcomps * pi[pino].step_c;
		pi[pino].step_l = maxres * pi[pino].step_r;
		
		for (compno = 0; compno < pi->numcomps; compno++) {
			opj_pi_comp_t *comp = &pi->comps[compno];
			for (resno = 0; resno < comp->numresolutions; resno++) {
				int dx, dy;
				opj_pi_resolution_t *res = &comp->resolutions[resno];
				dx = comp->dx * (1 << (res->pdx + comp->numresolutions - 1 - resno));
				dy = comp->dy * (1 << (res->pdy + comp->numresolutions - 1 - resno));
				pi[pino].dx = !pi->dx ? dx : int_min(pi->dx, dx);
				pi[pino].dy = !pi->dy ? dy : int_min(pi->dy, dy);
			}
		}

		if (pino == 0) {
			array_size = tcp->numlayers * pi[pino].step_l * sizeof(short int);
			pi[pino].include = (short int *) opj_malloc(array_size);
			if(!pi[pino].include) {
				pi_destroy(pi, cp, tileno);
				return NULL;
			}
		}
		else {
			pi[pino].include = pi[pino - 1].include;
		}
		
		/* Generation of boundaries for each prog flag*/
			if(tcp->POC & (t2_mode == FINAL_PASS)){
				tcp->pocs[pino].compS= tcp->pocs[pino].compno0;
				tcp->pocs[pino].compE= tcp->pocs[pino].compno1;
				tcp->pocs[pino].resS = tcp->pocs[pino].resno0;
				tcp->pocs[pino].resE = tcp->pocs[pino].resno1;
				tcp->pocs[pino].layE = tcp->pocs[pino].layno1;
				tcp->pocs[pino].prg  = tcp->pocs[pino].prg1;
				if (pino > 0)
					tcp->pocs[pino].layS = (tcp->pocs[pino].layE > tcp->pocs[pino - 1].layE) ? tcp->pocs[pino - 1].layE : 0;
			}else {
				tcp->pocs[pino].compS= 0;
				tcp->pocs[pino].compE= image->numcomps;
				tcp->pocs[pino].resS = 0;
				tcp->pocs[pino].resE = maxres;
				tcp->pocs[pino].layS = 0;
				tcp->pocs[pino].layE = tcp->numlayers;
				tcp->pocs[pino].prg  = tcp->prg;
			}
			tcp->pocs[pino].prcS = 0;
			tcp->pocs[pino].prcE = maxprec;;
			tcp->pocs[pino].txS = pi[pino].tx0;
			tcp->pocs[pino].txE = pi[pino].tx1;
			tcp->pocs[pino].tyS = pi[pino].ty0;
			tcp->pocs[pino].tyE = pi[pino].ty1;
			tcp->pocs[pino].dx = pi[pino].dx;
			tcp->pocs[pino].dy = pi[pino].dy;
		}
			return pi;
	}



void pi_destroy(opj_pi_iterator_t *pi, opj_cp_t *cp, int tileno) {
	int compno, pino;
	opj_tcp_t *tcp = &cp->tcps[tileno];
	if(pi) {
		for (pino = 0; pino < tcp->numpocs + 1; pino++) {	
			if(pi[pino].comps) {
				for (compno = 0; compno < pi->numcomps; compno++) {
					opj_pi_comp_t *comp = &pi[pino].comps[compno];
					if(comp->resolutions) {
						opj_free(comp->resolutions);
					}
				}
				opj_free(pi[pino].comps);
			}
		}
		if(pi->include) {
			opj_free(pi->include);
		}
		opj_free(pi);
	}
}

bool pi_next(opj_pi_iterator_t * pi) {
	switch (pi->poc.prg) {
		case LRCP:
			return pi_next_lrcp(pi);
		case RLCP:
			return pi_next_rlcp(pi);
		case RPCL:
			return pi_next_rpcl(pi);
		case PCRL:
			return pi_next_pcrl(pi);
		case CPRL:
			return pi_next_cprl(pi);
		case PROG_UNKNOWN:
			return false;
	}
	
	return false;
}

int pi_check_next_level(int pos,opj_cp_t *cp,int tileno, int pino, char *prog){
	int i,l;
	opj_tcp_t *tcps = &cp->tcps[tileno];
	opj_poc_t *tcp = &tcps->pocs[pino];
	if(pos>=0){
		for(i=pos;pos>=0;i--){
			switch(prog[i]){
		case 'R':
			if(tcp->res_t==tcp->resE){
				l=pi_check_next_level(pos-1,cp,tileno,pino,prog);
				if(l==1){
					return 1;
				}else{
					return 0;
				}
			}else{
				return 1;
			}
			break;
		case 'C':
			if(tcp->comp_t==tcp->compE){
				l=pi_check_next_level(pos-1,cp,tileno,pino,prog);
				if(l==1){
					return 1;
				}else{
					return 0;
				}
			}else{
				return 1;
			}
			break;
		case 'L':
			if(tcp->lay_t==tcp->layE){
				l=pi_check_next_level(pos-1,cp,tileno,pino,prog);
				if(l==1){
					return 1;
				}else{
					return 0;
				}
			}else{
				return 1;
			}
			break;
		case 'P':
			switch(tcp->prg){
				case LRCP:
				case RLCP:
					if(tcp->prc_t == tcp->prcE){
						l=pi_check_next_level(i-1,cp,tileno,pino,prog);
						if(l==1){
							return 1;
						}else{
							return 0;
						}
					}else{
						return 1;
					}
					break;
			default:
				if(tcp->tx0_t == tcp->txE){
					/* TY */
					if(tcp->ty0_t == tcp->tyE){
						l=pi_check_next_level(i-1,cp,tileno,pino,prog);
						if(l==1){
							return 1;
						}else{
							return 0;
						}
					}else{
						return 1;
					}/*TY */
				}else{
					return 1;
				}
				break;
			}/*end case P */
		}/*end switch */
		}/*end for */
	}/*end if */
	return 0;
}


void pi_create_encode( opj_pi_iterator_t *pi, opj_cp_t *cp,int tileno, int pino,int tpnum, int tppos){
	char *prog;
	int i,l;
	int incr_top=1,resetX=0;
	opj_tcp_t *tcps = &cp->tcps[tileno];
	opj_poc_t *tcp= &tcps->pocs[pino];
	prog = j2k_convert_progression_order(tcp->prg);

	pi[pino].first = 1;
	pi[pino].poc.prg = tcp->prg;	
	
	if(!(cp->tp_on)){
		pi[pino].poc.resno0 = tcp->resS;
		pi[pino].poc.resno1 = tcp->resE;
		pi[pino].poc.compno0 = tcp->compS;
		pi[pino].poc.compno1 = tcp->compE;
		pi[pino].poc.layno0 = tcp->layS;
		pi[pino].poc.layno1 = tcp->layE;
		pi[pino].poc.precno0 = tcp->prcS;
		pi[pino].poc.precno1 = tcp->prcE;
		pi[pino].poc.tx0 = tcp->txS;
		pi[pino].poc.ty0 = tcp->tyS;
		pi[pino].poc.tx1 = tcp->txE;
		pi[pino].poc.ty1 = tcp->tyE;
	}else {
		for(i=tppos+1;i<4;i++){
			switch(prog[i]){
			case 'R':
				pi[pino].poc.resno0 = tcp->resS;
				pi[pino].poc.resno1 = tcp->resE;
				break;
			case 'C':
				pi[pino].poc.compno0 = tcp->compS;
				pi[pino].poc.compno1 = tcp->compE;
				break;
			case 'L':
				pi[pino].poc.layno0 = tcp->layS;
				pi[pino].poc.layno1 = tcp->layE;
				break;
			case 'P':
				switch(tcp->prg){
					case LRCP:
					case RLCP:
						pi[pino].poc.precno0 = tcp->prcS;
						pi[pino].poc.precno1 = tcp->prcE;
						break;
					default:
						pi[pino].poc.tx0 = tcp->txS;
						pi[pino].poc.ty0 = tcp->tyS;
						pi[pino].poc.tx1 = tcp->txE;
						pi[pino].poc.ty1 = tcp->tyE;
						break;
				}
				break;
			}
		}

		if(tpnum==0){
			for(i=tppos;i>=0;i--){
				switch(prog[i]){
						case 'C':
							tcp->comp_t = tcp->compS;
							pi[pino].poc.compno0 = tcp->comp_t;
							pi[pino].poc.compno1 = tcp->comp_t+1;
							tcp->comp_t+=1;
							break;
						case 'R':
							tcp->res_t = tcp->resS;
							pi[pino].poc.resno0 = tcp->res_t;
							pi[pino].poc.resno1 = tcp->res_t+1;
							tcp->res_t+=1;
							break;
						case 'L':
							tcp->lay_t = tcp->layS;
							pi[pino].poc.layno0 = tcp->lay_t;
							pi[pino].poc.layno1 = tcp->lay_t+1;
							tcp->lay_t+=1;
							break;
						case 'P':
							switch(tcp->prg){
								case LRCP:
								case RLCP:
									tcp->prc_t = tcp->prcS;
									pi[pino].poc.precno0 = tcp->prc_t;
									pi[pino].poc.precno1 = tcp->prc_t+1;
									tcp->prc_t+=1; 
									break;
								default:
									tcp->tx0_t = tcp->txS;
									tcp->ty0_t = tcp->tyS;
									pi[pino].poc.tx0 = tcp->tx0_t;
									pi[pino].poc.tx1 = tcp->tx0_t + tcp->dx - (tcp->tx0_t % tcp->dx);
									pi[pino].poc.ty0 = tcp->ty0_t;
									pi[pino].poc.ty1 = tcp->ty0_t + tcp->dy - (tcp->ty0_t % tcp->dy);
									tcp->tx0_t = pi[pino].poc.tx1;
									tcp->ty0_t = pi[pino].poc.ty1;
									break;
							}
							break;
				}
			}
			incr_top=1;
		}else{
			for(i=tppos;i>=0;i--){
				switch(prog[i]){
						case 'C':
							pi[pino].poc.compno0 = tcp->comp_t-1;
							pi[pino].poc.compno1 = tcp->comp_t;
							break;
						case 'R':
							pi[pino].poc.resno0 = tcp->res_t-1;
							pi[pino].poc.resno1 = tcp->res_t;
							break;
						case 'L':
							pi[pino].poc.layno0 = tcp->lay_t-1;
							pi[pino].poc.layno1 = tcp->lay_t;
							break;
						case 'P':
							switch(tcp->prg){
								case LRCP:
								case RLCP:
									pi[pino].poc.precno0 = tcp->prc_t-1;
									pi[pino].poc.precno1 = tcp->prc_t;
									break;
								default:
									pi[pino].poc.tx0 = tcp->tx0_t - tcp->dx - (tcp->tx0_t % tcp->dx);
									pi[pino].poc.tx1 = tcp->tx0_t ;
									pi[pino].poc.ty0 = tcp->ty0_t - tcp->dy - (tcp->ty0_t % tcp->dy);
									pi[pino].poc.ty1 = tcp->ty0_t ;
									break;
							}
							break;
				}
				if(incr_top==1){
					switch(prog[i]){
							case 'R':
								if(tcp->res_t==tcp->resE){
									l=pi_check_next_level(i-1,cp,tileno,pino,prog);
									if(l==1){
										tcp->res_t = tcp->resS;
										pi[pino].poc.resno0 = tcp->res_t;
										pi[pino].poc.resno1 = tcp->res_t+1;
										tcp->res_t+=1;
										incr_top=1;
									}else{
										incr_top=0;
									}
								}else{
									pi[pino].poc.resno0 = tcp->res_t;
									pi[pino].poc.resno1 = tcp->res_t+1;
									tcp->res_t+=1;
									incr_top=0;
								}
								break;
							case 'C':
								if(tcp->comp_t ==tcp->compE){
									l=pi_check_next_level(i-1,cp,tileno,pino,prog);
									if(l==1){
										tcp->comp_t = tcp->compS;
										pi[pino].poc.compno0 = tcp->comp_t;
										pi[pino].poc.compno1 = tcp->comp_t+1;
										tcp->comp_t+=1;
										incr_top=1;
									}else{
										incr_top=0;
									}
								}else{
									pi[pino].poc.compno0 = tcp->comp_t;
									pi[pino].poc.compno1 = tcp->comp_t+1;
									tcp->comp_t+=1;
									incr_top=0;
								}
								break;	
							case 'L':
								if(tcp->lay_t == tcp->layE){
									l=pi_check_next_level(i-1,cp,tileno,pino,prog);
									if(l==1){
										tcp->lay_t = tcp->layS;
										pi[pino].poc.layno0 = tcp->lay_t;
										pi[pino].poc.layno1 = tcp->lay_t+1;
										tcp->lay_t+=1;
										incr_top=1;
									}else{
										incr_top=0;
									}
								}else{
									pi[pino].poc.layno0 = tcp->lay_t;
									pi[pino].poc.layno1 = tcp->lay_t+1;
									tcp->lay_t+=1;
									incr_top=0;
								}
								break;
							case 'P':
								switch(tcp->prg){
									case LRCP:
									case RLCP:
										if(tcp->prc_t == tcp->prcE){
											l=pi_check_next_level(i-1,cp,tileno,pino,prog);
											if(l==1){
												tcp->prc_t = tcp->prcS;
												pi[pino].poc.precno0 = tcp->prc_t;
												pi[pino].poc.precno1 = tcp->prc_t+1;
												tcp->prc_t+=1;
												incr_top=1;
											}else{
												incr_top=0;
											}
										}else{
											pi[pino].poc.precno0 = tcp->prc_t;
											pi[pino].poc.precno1 = tcp->prc_t+1;
											tcp->prc_t+=1;
											incr_top=0;
										}
										break;
									default:
										if(tcp->tx0_t >= tcp->txE){
											if(tcp->ty0_t >= tcp->tyE){
												l=pi_check_next_level(i-1,cp,tileno,pino,prog);
												if(l==1){
													tcp->ty0_t = tcp->tyS;
													pi[pino].poc.ty0 = tcp->ty0_t;
													pi[pino].poc.ty1 = tcp->ty0_t + tcp->dy - (tcp->ty0_t % tcp->dy);
													tcp->ty0_t = pi[pino].poc.ty1;
													incr_top=1;resetX=1;
												}else{
													incr_top=0;resetX=0;
												}
											}else{
												pi[pino].poc.ty0 = tcp->ty0_t;
												pi[pino].poc.ty1 = tcp->ty0_t + tcp->dy - (tcp->ty0_t % tcp->dy);
												tcp->ty0_t = pi[pino].poc.ty1;
												incr_top=0;resetX=1;
											}
											if(resetX==1){
												tcp->tx0_t = tcp->txS;
												pi[pino].poc.tx0 = tcp->tx0_t;
												pi[pino].poc.tx1 = tcp->tx0_t + tcp->dx- (tcp->tx0_t % tcp->dx);
												tcp->tx0_t = pi[pino].poc.tx1;
											}
										}else{
											pi[pino].poc.tx0 = tcp->tx0_t;
											pi[pino].poc.tx1 = tcp->tx0_t + tcp->dx- (tcp->tx0_t % tcp->dx);
											tcp->tx0_t = pi[pino].poc.tx1;
											incr_top=0;
										}
										break;
								}
								break;
					}
				}
			}
		}
	}
}


