openjpeg/libopenjpeg/jpwl/jpwl_lib.c

/*
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
 * Copyright (c) 2005-2006, Dept. of Electronic and Information Engineering, Universita' degli Studi di Perugia, Italy
 * 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.
 */

#ifdef USE_JPWL

#include "opj_includes.h"
#include <limits.h>

/** Minimum and maximum values for the double->pfp conversion */
#define MIN_V1 0.0
#define MAX_V1 17293822569102704640.0
#define MIN_V2 0.000030517578125
#define MAX_V2 131040.0

/** conversion between a double precision floating point
number and the corresponding pseudo-floating point used 
to represent sensitivity values
@param V the double precision value
@param bytes the number of bytes of the representation
@return the pseudo-floating point value (cast accordingly)
*/
unsigned short int jpwl_double_to_pfp(double V, int bytes);

/** conversion between a pseudo-floating point used 
to represent sensitivity values and the corresponding
double precision floating point number  
@param em the pseudo-floating point value (cast accordingly)
@param bytes the number of bytes of the representation
@return the double precision value
*/
double jpwl_pfp_to_double(unsigned short int em, int bytes);

	/*-------------------------------------------------------------*/

int jpwl_markcomp(const void *arg1, const void *arg2)
{
   /* Compare the two markers' positions */
   double diff = (((jpwl_marker_t *) arg1)->dpos - ((jpwl_marker_t *) arg2)->dpos);

   if (diff == 0.0)
	   return (0);
   else if (diff < 0)
	   return (-1);
   else
	   return (+1);
}

int jpwl_epbs_add(opj_j2k_t *j2k, jpwl_marker_t *jwmarker, int *jwmarker_num,
				  opj_bool latest, opj_bool packed, opj_bool insideMH, int *idx, int hprot,
				  double place_pos, int tileno,
				  unsigned long int pre_len, unsigned long int post_len) {

	jpwl_epb_ms_t *epb_mark = NULL;

	int k_pre, k_post, n_pre, n_post;
	
	unsigned long int L1, L2, dL4, max_postlen, epbs_len = 0;

	/* We find RS(n,k) for EPB parms and pre-data, if any */
	if (insideMH && (*idx == 0)) {
		/* First EPB in MH */ 
		k_pre = 64;
		n_pre = 160;
	} else if (!insideMH && (*idx == 0)) {
		/* First EPB in TH */
		k_pre = 25;
		n_pre = 80;
	} else {
		/* Following EPBs in MH or TH */
		k_pre = 13;
		n_pre = 40;
	};

	/* Find lengths, Figs. B3 and B4 */
	/* size of pre data: pre_buf(pre_len) + EPB(2) + Lepb(2) + Depb(1) + LDPepb(4) + Pepb(4) */
	L1 = pre_len + 13;

	/* size of pre-data redundancy */
	/*   (redundancy per codeword)       *     (number of codewords, rounded up)   */
	L2 = (n_pre - k_pre) * (unsigned long int) ceil((double) L1 / (double) k_pre);

	/* Find protection type for post data and its associated redundancy field length*/
	if ((hprot == 16) || (hprot == 32)) {
		/* there is a CRC for post-data */
		k_post = post_len;
		n_post = post_len + (hprot >> 3);
		/*L3 = hprot >> 3;*/ /* 2 (CRC-16) or 4 (CRC-32) bytes */

	} else if ((hprot >= 37) && (hprot <= 128)) {
		/* there is a RS for post-data */
		k_post = 32;
		n_post = hprot;

	} else {
		/* Use predefined codes */
		n_post = n_pre;
		k_post = k_pre;
	};

	/* Create the EPB(s) */
	while (post_len > 0) {

		/* maximum postlen in order to respect EPB size
		(we use JPWL_MAXIMUM_EPB_ROOM instead of 65535 for keeping room for EPB parms)*/
		/*      (message word size)    *            (number of containable parity words)  */
		max_postlen = k_post * (unsigned long int) floor((double) JPWL_MAXIMUM_EPB_ROOM / (double) (n_post - k_post));

		/* maximum postlen in order to respect EPB size */
		if (*idx == 0)
			/* (we use (JPWL_MAXIMUM_EPB_ROOM - L2) instead of 65535 for keeping room for EPB parms + pre-data) */
			/*      (message word size)    *                   (number of containable parity words)  */
			max_postlen = k_post * (unsigned long int) floor((double) (JPWL_MAXIMUM_EPB_ROOM - L2) / (double) (n_post - k_post));

		else
			/* (we use JPWL_MAXIMUM_EPB_ROOM instead of 65535 for keeping room for EPB parms) */
			/*      (message word size)    *            (number of containable parity words)  */
			max_postlen = k_post * (unsigned long int) floor((double) JPWL_MAXIMUM_EPB_ROOM / (double) (n_post - k_post));

		/* null protection case */
		/* the max post length can be as large as the LDPepb field can host */
		if (hprot == 0)
			max_postlen = INT_MAX;
		
		/* length to use */
		dL4 = min(max_postlen, post_len);

		if ((epb_mark = jpwl_epb_create(
			j2k, /* this encoder handle */
			latest ? (dL4 < max_postlen) : OPJ_FALSE, /* is it the latest? */
			packed, /* is it packed? */
			tileno, /* we are in TPH */
			*idx, /* its index */
			hprot, /* protection type parameters of following data */
			0, /* pre-data: nothing for now */
			dL4 /* post-data: the stub computed previously */
			))) {
			
			/* Add this marker to the 'insertanda' list */
			if (*jwmarker_num < JPWL_MAX_NO_MARKERS) {
				jwmarker[*jwmarker_num].id = J2K_MS_EPB; /* its type */
				jwmarker[*jwmarker_num].m.epbmark = epb_mark; /* the EPB */
				jwmarker[*jwmarker_num].pos = (int) place_pos; /* after SOT */
				jwmarker[*jwmarker_num].dpos = place_pos + 0.0000001 * (double)(*idx); /* not very first! */
				jwmarker[*jwmarker_num].len = epb_mark->Lepb; /* its length */
				jwmarker[*jwmarker_num].len_ready = OPJ_TRUE; /* ready */
				jwmarker[*jwmarker_num].pos_ready = OPJ_TRUE; /* ready */
				jwmarker[*jwmarker_num].parms_ready = OPJ_TRUE; /* ready */
				jwmarker[*jwmarker_num].data_ready = OPJ_FALSE; /* not ready */
				(*jwmarker_num)++;
			}

			/* increment epb index */
			(*idx)++;

			/* decrease postlen */
			post_len -= dL4;

			/* increase the total length of EPBs */
			epbs_len += epb_mark->Lepb + 2;

		} else {
			/* ooops, problems */
			opj_event_msg(j2k->cinfo, EVT_ERROR, "Could not create TPH EPB for UEP in tile %d\n", tileno);				
		};
	}

	return epbs_len;
}


jpwl_epb_ms_t *jpwl_epb_create(opj_j2k_t *j2k, opj_bool latest, opj_bool packed, int tileno, int idx, int hprot,
						  unsigned long int pre_len, unsigned long int post_len) {

	jpwl_epb_ms_t *epb = NULL;
	/*unsigned short int data_len = 0;*/
	unsigned short int L2, L3;
	unsigned long int L1, L4;
	/*unsigned char *predata_in = NULL;*/

	opj_bool insideMH = (tileno == -1);

	/* Alloc space */
	if (!(epb = (jpwl_epb_ms_t *) opj_malloc((size_t) 1 * sizeof (jpwl_epb_ms_t)))) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Could not allocate room for one EPB MS\n");
		return NULL;
	};

	/* We set RS(n,k) for EPB parms and pre-data, if any */
	if (insideMH && (idx == 0)) {
		/* First EPB in MH */ 
		epb->k_pre = 64;
		epb->n_pre = 160;
	} else if (!insideMH && (idx == 0)) {
		/* First EPB in TH */
		epb->k_pre = 25;
		epb->n_pre = 80;
	} else {
		/* Following EPBs in MH or TH */
		epb->k_pre = 13;
		epb->n_pre = 40;
	};

	/* Find lengths, Figs. B3 and B4 */
	/* size of pre data: pre_buf(pre_len) + EPB(2) + Lepb(2) + Depb(1) + LDPepb(4) + Pepb(4) */
	L1 = pre_len + 13;
	epb->pre_len = pre_len;

	/* size of pre-data redundancy */
	/*   (redundancy per codeword)       *               (number of codewords, rounded up)   */
	L2 = (epb->n_pre - epb->k_pre) * (unsigned short int) ceil((double) L1 / (double) epb->k_pre);

	/* length of post-data */
	L4 = post_len;
	epb->post_len = post_len;

	/* Find protection type for post data and its associated redundancy field length*/
	if ((hprot == 16) || (hprot == 32)) {
		/* there is a CRC for post-data */
		epb->Pepb = 0x10000000 | ((unsigned long int) hprot >> 5); /* 0=CRC-16, 1=CRC-32 */
		epb->k_post = post_len;
		epb->n_post = post_len + (hprot >> 3);
		/*L3 = hprot >> 3;*/ /* 2 (CRC-16) or 4 (CRC-32) bytes */

	} else if ((hprot >= 37) && (hprot <= 128)) {
		/* there is a RS for post-data */
		epb->Pepb = 0x20000020 | (((unsigned long int) hprot & 0x000000FF) << 8);
		epb->k_post = 32;
		epb->n_post = hprot;

	} else if (hprot == 1) {
		/* Use predefined codes */
		epb->Pepb = (unsigned long int) 0x00000000;
		epb->n_post = epb->n_pre;
		epb->k_post = epb->k_pre;
	
	} else if (hprot == 0) {
		/* Placeholder EPB: only protects its parameters, no protection method */
		epb->Pepb = (unsigned long int) 0xFFFFFFFF;
		epb->n_post = 1;
		epb->k_post = 1;
	
	} else {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Invalid protection value for EPB h = %d\n", hprot);				
		return NULL;
	}

	epb->hprot = hprot;

	/*   (redundancy per codeword)          *                (number of codewords, rounded up) */
	L3 = (epb->n_post - epb->k_post) * (unsigned short int) ceil((double) L4 / (double) epb->k_post);

	/* private fields */
	epb->tileno = tileno;

	/* Fill some fields of the EPB */

	/* total length of the EPB MS (less the EPB marker itself): */
	/* Lepb(2) + Depb(1) + LDPepb(4) + Pepb(4) + pre_redundancy + post-redundancy */
	epb->Lepb = 11 + L2 + L3;

	/* EPB style */
	epb->Depb = ((packed & 0x0001) << 7) | ((latest & 0x0001) << 6) | (idx & 0x003F);

	/* length of data protected by EPB: */
	epb->LDPepb = L1 + L4;

	return epb;
}

void jpwl_epb_write(opj_j2k_t *j2k, jpwl_epb_ms_t *epb, unsigned char *buf) {

	/* Marker */
	*(buf++) = (unsigned char) (J2K_MS_EPB >> 8); 
	*(buf++) = (unsigned char) (J2K_MS_EPB >> 0); 

	/* Lepb */
	*(buf++) = (unsigned char) (epb->Lepb >> 8); 
	*(buf++) = (unsigned char) (epb->Lepb >> 0); 

	/* Depb */
	*(buf++) = (unsigned char) (epb->Depb >> 0); 

	/* LDPepb */
	*(buf++) = (unsigned char) (epb->LDPepb >> 24); 
	*(buf++) = (unsigned char) (epb->LDPepb >> 16); 
	*(buf++) = (unsigned char) (epb->LDPepb >> 8); 
	*(buf++) = (unsigned char) (epb->LDPepb >> 0); 

	/* Pepb */
	*(buf++) = (unsigned char) (epb->Pepb >> 24); 
	*(buf++) = (unsigned char) (epb->Pepb >> 16); 
	*(buf++) = (unsigned char) (epb->Pepb >> 8); 
	*(buf++) = (unsigned char) (epb->Pepb >> 0); 

	/* Data */
	/*memcpy(buf, epb->data, (size_t) epb->Lepb - 11);*/
	memset(buf, 0, (size_t) epb->Lepb - 11);

	/* update markers struct */
	j2k_add_marker(j2k->cstr_info, J2K_MS_EPB, -1, epb->Lepb + 2);

};


jpwl_epc_ms_t *jpwl_epc_create(opj_j2k_t *j2k, opj_bool esd_on, opj_bool red_on, opj_bool epb_on, opj_bool info_on) {

	jpwl_epc_ms_t *epc = NULL;

	/* Alloc space */
	if (!(epc = (jpwl_epc_ms_t *) opj_malloc((size_t) 1 * sizeof (jpwl_epc_ms_t)))) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Could not allocate room for EPC MS\n");
		return NULL;
	};

	/* Set the EPC parameters */
	epc->esd_on = esd_on;
	epc->epb_on = epb_on;
	epc->red_on = red_on;
	epc->info_on = info_on;

	/* Fill the EPC fields with default values */
	epc->Lepc = 9;
	epc->Pcrc = 0x0000;
	epc->DL = 0x00000000;
	epc->Pepc = ((j2k->cp->esd_on & 0x0001) << 4) | ((j2k->cp->red_on & 0x0001) << 5) |
		((j2k->cp->epb_on & 0x0001) << 6) | ((j2k->cp->info_on & 0x0001) << 7);

	return (epc);
}

opj_bool jpwl_epb_fill(opj_j2k_t *j2k, jpwl_epb_ms_t *epb, unsigned char *buf, unsigned char *post_buf) {

	unsigned long int L1, L2, L3, L4;
	int remaining;
	unsigned long int P, NN_P;

	/* Operating buffer */
	static unsigned char codeword[NN], *parityword;

	unsigned char *L1_buf, *L2_buf;
	/* these ones are static, since we need to keep memory of
	 the exact place from one call to the other */
	static unsigned char *L3_buf, *L4_buf;

	/* some consistency check */
	if (!buf) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "There is no operating buffer for EPBs\n");
		return OPJ_FALSE;
	}

	if (!post_buf && !L4_buf) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "There is no operating buffer for EPBs data\n");
		return OPJ_FALSE;
	}

	/*
	 * Compute parity bytes on pre-data, ALWAYS present (at least only for EPB parms)
	 */

	/* Initialize RS structures */
	P = epb->n_pre - epb->k_pre;
	NN_P = NN - P;
	memset(codeword, 0, NN);
	parityword = codeword + NN_P;
	init_rs(NN_P);

	/* pre-data begins pre_len bytes before of EPB buf */
	L1_buf = buf - epb->pre_len;
	L1 = epb->pre_len + 13;

	/* redundancy for pre-data begins immediately after EPB parms */
	L2_buf = buf + 13;
	L2 = (epb->n_pre - epb->k_pre) * (unsigned short int) ceil((double) L1 / (double) epb->k_pre);

	/* post-data
	   the position of L4 buffer can be:
	     1) passed as a parameter: in that case use it
	     2) null: in that case use the previous (static) one
	*/
	if (post_buf)
		L4_buf = post_buf;
	L4 = epb->post_len;

	/* post-data redundancy begins immediately after pre-data redundancy */
	L3_buf = L2_buf + L2;
	L3 = (epb->n_post - epb->k_post) * (unsigned short int) ceil((double) L4 / (double) epb->k_post);

	/* let's check whether EPB length is sufficient to contain all these data */
	if (epb->Lepb < (11 + L2 + L3))
		opj_event_msg(j2k->cinfo, EVT_ERROR, "There is no room in EPB data field for writing redundancy data\n");
	/*printf("Env. %d, nec. %d (%d + %d)\n", epb->Lepb - 11, L2 + L3, L2, L3);*/

	/* Compute redundancy of pre-data message words */
	remaining = L1;
	while (remaining) {

		/* copy message data into codeword buffer */
		if (remaining < epb->k_pre) {
			/* the last message word is zero-padded */
			memset(codeword, 0, NN);
			memcpy(codeword, L1_buf, remaining);
			L1_buf += remaining;
			remaining = 0;

		} else {
			memcpy(codeword, L1_buf, epb->k_pre);
			L1_buf += epb->k_pre;
			remaining -= epb->k_pre;

		}

		/* Encode the buffer and obtain parity bytes */
		if (encode_rs(codeword, parityword))
			opj_event_msg(j2k->cinfo, EVT_WARNING,
				"Possible encoding error in codeword @ position #%d\n", (L1_buf - buf) / epb->k_pre);

		/* copy parity bytes only in redundancy buffer */
		memcpy(L2_buf, parityword, P); 

		/* advance parity buffer */
		L2_buf += P;
	}

	/*
	 * Compute parity bytes on post-data, may be absent if there are no data
	 */
	/*printf("Hprot is %d (tileno=%d, k_pre=%d, n_pre=%d, k_post=%d, n_post=%d, pre_len=%d, post_len=%d)\n",
		epb->hprot, epb->tileno, epb->k_pre, epb->n_pre, epb->k_post, epb->n_post, epb->pre_len,
		epb->post_len);*/
	if (epb->hprot < 0) {

		/* there should be no EPB */
		
	} else if (epb->hprot == 0) {

		/* no protection for the data */
		/* advance anyway */
		L4_buf += epb->post_len;

	} else if (epb->hprot == 16) {

		/* CRC-16 */
		unsigned short int mycrc = 0x0000;

		/* compute the CRC field (excluding itself) */
		remaining = L4;
		while (remaining--)
			jpwl_updateCRC16(&mycrc, *(L4_buf++));

		/* write the CRC field */
		*(L3_buf++) = (unsigned char) (mycrc >> 8);
		*(L3_buf++) = (unsigned char) (mycrc >> 0);

	} else if (epb->hprot == 32) {

		/* CRC-32 */
		unsigned long int mycrc = 0x00000000;

		/* compute the CRC field (excluding itself) */
		remaining = L4;
		while (remaining--)
			jpwl_updateCRC32(&mycrc, *(L4_buf++));

		/* write the CRC field */
		*(L3_buf++) = (unsigned char) (mycrc >> 24);
		*(L3_buf++) = (unsigned char) (mycrc >> 16);
		*(L3_buf++) = (unsigned char) (mycrc >> 8);
		*(L3_buf++) = (unsigned char) (mycrc >> 0);

	} else {

		/* RS */

		/* Initialize RS structures */
		P = epb->n_post - epb->k_post;
		NN_P = NN - P;
		memset(codeword, 0, NN);
		parityword = codeword + NN_P;
		init_rs(NN_P);

		/* Compute redundancy of post-data message words */
		remaining = L4;
		while (remaining) {

			/* copy message data into codeword buffer */
			if (remaining < epb->k_post) {
				/* the last message word is zero-padded */
				memset(codeword, 0, NN);
				memcpy(codeword, L4_buf, remaining);
				L4_buf += remaining;
				remaining = 0;

			} else {
				memcpy(codeword, L4_buf, epb->k_post);
				L4_buf += epb->k_post;
				remaining -= epb->k_post;

			}

			/* Encode the buffer and obtain parity bytes */
			if (encode_rs(codeword, parityword))
				opj_event_msg(j2k->cinfo, EVT_WARNING,
					"Possible encoding error in codeword @ position #%d\n", (L4_buf - buf) / epb->k_post);

			/* copy parity bytes only in redundancy buffer */
			memcpy(L3_buf, parityword, P); 

			/* advance parity buffer */
			L3_buf += P;
		}

	}

	return OPJ_TRUE;
}


opj_bool jpwl_correct(opj_j2k_t *j2k) {

	opj_cio_t *cio = j2k->cio;
	opj_bool status;
	static opj_bool mh_done = OPJ_FALSE;
	int mark_pos, id, len, skips, sot_pos;
	unsigned long int Psot = 0;

	/* go back to marker position */
	mark_pos = cio_tell(cio) - 2;
	cio_seek(cio, mark_pos);

	if ((j2k->state == J2K_STATE_MHSOC) && !mh_done) {

		int mark_val = 0, skipnum = 0;

		/*
		  COLOR IMAGE
		  first thing to do, if we are here, is to look whether
		  51 (skipnum) positions ahead there is an EPB, in case of MH
		*/
		/*
		  B/W IMAGE
		  first thing to do, if we are here, is to look whether
		  45 (skipnum) positions ahead there is an EPB, in case of MH
		*/
		/*       SIZ   SIZ_FIELDS     SIZ_COMPS               FOLLOWING_MARKER */
		skipnum = 2  +     38     + 3 * j2k->cp->exp_comps  +         2;
		if ((cio->bp + skipnum) < cio->end) {

			cio_skip(cio, skipnum);

			/* check that you are not going beyond the end of codestream */

			/* call EPB corrector */
			status = jpwl_epb_correct(j2k,     /* J2K decompressor handle */
									  cio->bp, /* pointer to EPB in codestream buffer */
									  0,       /* EPB type: MH */
									  skipnum,      /* length of pre-data */
									  -1,      /* length of post-data: -1 means auto */
									  NULL,
									  NULL
									 );

			/* read the marker value */
			mark_val = (*(cio->bp) << 8) | *(cio->bp + 1);

			if (status && (mark_val == J2K_MS_EPB)) {
				/* we found it! */
				mh_done = OPJ_TRUE;
				return OPJ_TRUE;
			}

			/* Disable correction in case of missing or bad head EPB */
			/* We can't do better! */
			/* PATCHED: 2008-01-25 */
			/* MOVED UP: 2008-02-01 */
			if (!status) {
				j2k->cp->correct = OPJ_FALSE;
				opj_event_msg(j2k->cinfo, EVT_WARNING, "Couldn't find the MH EPB: disabling JPWL\n");
			}

		}

	}

	if (OPJ_TRUE /*(j2k->state == J2K_STATE_TPHSOT) || (j2k->state == J2K_STATE_TPH)*/) {
		/* else, look if 12 positions ahead there is an EPB, in case of TPH */
		cio_seek(cio, mark_pos);
		if ((cio->bp + 12) < cio->end) {

			cio_skip(cio, 12);

			/* call EPB corrector */
			status = jpwl_epb_correct(j2k,     /* J2K decompressor handle */
									  cio->bp, /* pointer to EPB in codestream buffer */
									  1,       /* EPB type: TPH */
									  12,      /* length of pre-data */
									  -1,      /* length of post-data: -1 means auto */
									  NULL,
									  NULL
									 );
			if (status)
				/* we found it! */
				return OPJ_TRUE;
		}
	}

	return OPJ_FALSE;

	/* for now, don't use this code */

	/* else, look if here is an EPB, in case of other */
	if (mark_pos > 64) {
		/* it cannot stay before the first MH EPB */
		cio_seek(cio, mark_pos);
		cio_skip(cio, 0);

		/* call EPB corrector */
		status = jpwl_epb_correct(j2k,     /* J2K decompressor handle */
								  cio->bp, /* pointer to EPB in codestream buffer */
								  2,       /* EPB type: TPH */
								  0,       /* length of pre-data */
								  -1,      /* length of post-data: -1 means auto */
								  NULL,
								  NULL
								 );
		if (status)
			/* we found it! */
			return OPJ_TRUE;
	}

	/* nope, no EPBs probably, or they are so damaged that we can give up */
	return OPJ_FALSE;
	
	return OPJ_TRUE;

	/* AN ATTEMPT OF PARSER */
	/* NOT USED ACTUALLY    */

	/* go to the beginning of the file */
	cio_seek(cio, 0);

	/* let's begin */
	j2k->state = J2K_STATE_MHSOC;

	/* cycle all over the markers */
	while (cio_tell(cio) < cio->length) {

		/* read the marker */
		mark_pos = cio_tell(cio);
		id = cio_read(cio, 2);

		/* details */
		printf("Marker@%lld: %X\n", cio_tell(cio) - 2, id);

		/* do an action in response to the read marker */
		switch (id) {

		/* short markers */

			/* SOC */
		case J2K_MS_SOC:
			j2k->state = J2K_STATE_MHSIZ;
			len = 0;
			skips = 0;
			break;

			/* EOC */
		case J2K_MS_EOC:
			j2k->state = J2K_STATE_MT;
			len = 0;
			skips = 0;
			break;

			/* particular case of SOD */
		case J2K_MS_SOD:
			len = Psot - (mark_pos - sot_pos) - 2;
			skips = len;
			break;

		/* long markers */

			/* SOT */
		case J2K_MS_SOT:
			j2k->state = J2K_STATE_TPH;
			sot_pos = mark_pos; /* position of SOT */
			len = cio_read(cio, 2); /* read the length field */
			cio_skip(cio, 2); /* this field is unnecessary */
			Psot = cio_read(cio, 4); /* tile length */
			skips = len - 8;
			break;

			/* remaining */
		case J2K_MS_SIZ:
			j2k->state = J2K_STATE_MH;
			/* read the length field */
			len = cio_read(cio, 2);
			skips = len - 2;
			break;

			/* remaining */
		default:
			/* read the length field */
			len = cio_read(cio, 2);
			skips = len - 2;
			break;

		}

		/* skip to marker's end */
		cio_skip(cio, skips);	

	}


}

opj_bool jpwl_epb_correct(opj_j2k_t *j2k, unsigned char *buffer, int type, int pre_len, int post_len, int *conn,
					  unsigned char **L4_bufp) {

	/* Operating buffer */
	unsigned char codeword[NN], *parityword;

	unsigned long int P, NN_P;
	unsigned long int L1, L4;
	int remaining, n_pre, k_pre, n_post, k_post;

	int status, tt;

	int orig_pos = cio_tell(j2k->cio);

	unsigned char *L1_buf, *L2_buf;
	unsigned char *L3_buf, *L4_buf;

	unsigned long int LDPepb, Pepb;
	unsigned short int Lepb;
	unsigned char Depb;
	char str1[25] = "";
	int myconn, errnum = 0;
	opj_bool errflag = OPJ_FALSE;
	
	opj_cio_t *cio = j2k->cio;

	/* check for common errors */
	if (!buffer) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "The EPB pointer is a NULL buffer\n");
		return OPJ_FALSE;
	}
	
	/* set bignesses */
	L1 = pre_len + 13;

	/* pre-data correction */
	switch (type) {

	case 0:
		/* MH EPB */
		k_pre = 64;
		n_pre = 160;
		break;

	case 1:
		/* TPH EPB */
		k_pre = 25;
		n_pre = 80;
		break;

	case 2:
		/* other EPBs */
		k_pre = 13;
		n_pre = 40;
		break;

	case 3:
		/* automatic setup */
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Auto. setup not yet implemented\n");
		return OPJ_FALSE;
		break;

	default:
		/* unknown type */
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Unknown expected EPB type\n");
		return OPJ_FALSE;
		break;

	}

	/* Initialize RS structures */
	P = n_pre - k_pre;
	NN_P = NN - P;
	tt = (int) floor((float) P / 2.0F); /* correction capability of the code */
	memset(codeword, 0, NN);
	parityword = codeword + NN_P;
	init_rs(NN_P);

	/* Correct pre-data message words */
	L1_buf = buffer - pre_len;
	L2_buf = buffer + 13;
	remaining = L1;
	while (remaining) {
 
		/* always zero-pad codewords */
		/* (this is required, since after decoding the zeros in the long codeword
		    could change, and keep unchanged in subsequent calls) */
		memset(codeword, 0, NN);

		/* copy codeword buffer into message bytes */
		if (remaining < k_pre)
			memcpy(codeword, L1_buf, remaining);
		else
			memcpy(codeword, L1_buf, k_pre);

		/* copy redundancy buffer in parity bytes */
		memcpy(parityword, L2_buf, P); 

		/* Decode the buffer and possibly obtain corrected bytes */
		status = eras_dec_rs(codeword, NULL, 0);
		if (status == -1) {
			/*if (conn == NULL)
				opj_event_msg(j2k->cinfo, EVT_WARNING,
					"Possible decoding error in codeword @ position #%d\n", (L1_buf - buffer) / k_pre);*/
			errflag = OPJ_TRUE;
			/* we can try to safely get out from the function:
			  if we are here, either this is not an EPB or the first codeword
			  is too damaged to be helpful */
			/*return OPJ_FALSE;*/

		} else if (status == 0) {
			/*if (conn == NULL)
				opj_event_msg(j2k->cinfo, EVT_INFO, "codeword is correctly decoded\n");*/

		} else if (status <= tt) {
			/* it has corrected 0 <= errs <= tt */
			/*if (conn == NULL)
				opj_event_msg(j2k->cinfo, EVT_WARNING, "%d errors corrected in codeword\n", status);*/
			errnum += status;

		} else {
			/*if (conn == NULL)
				opj_event_msg(j2k->cinfo, EVT_WARNING, "EPB correction capability exceeded\n");
			return OPJ_FALSE;*/
			errflag = OPJ_TRUE;
		}


		/* advance parity buffer */
		if ((status >= 0) && (status <= tt))
			/* copy back corrected parity only if all is OK */
			memcpy(L2_buf, parityword, P);
		L2_buf += P;

		/* advance message buffer */
		if (remaining < k_pre) {
			if ((status >= 0) && (status <= tt))
				/* copy back corrected data only if all is OK */
				memcpy(L1_buf, codeword, remaining);
			L1_buf += remaining;
			remaining = 0;

		} else {
			if ((status >= 0) && (status <= tt))
				/* copy back corrected data only if all is OK */
				memcpy(L1_buf, codeword, k_pre);
			L1_buf += k_pre;
			remaining -= k_pre;

		}
	}

	/* print summary */
	if (!conn) {

		/*if (errnum)
			opj_event_msg(j2k->cinfo, EVT_INFO, "+ %d symbol errors corrected (Ps=%.1e)\n", errnum,
				(float) errnum / ((float) n_pre * (float) L1 / (float) k_pre));*/
		if (errflag) {
			/*opj_event_msg(j2k->cinfo, EVT_INFO, "+ there were unrecoverable errors\n");*/
			return OPJ_FALSE;
		}

	}

	/* presumably, now, EPB parameters are correct */
	/* let's get them */

	/* Simply read the EPB parameters */
	if (conn)
		cio->bp = buffer;
	cio_skip(cio, 2); /* the marker */
	Lepb = cio_read(cio, 2);
	Depb = cio_read(cio, 1);
	LDPepb = cio_read(cio, 4);
	Pepb = cio_read(cio, 4);

	/* What does Pepb tells us about the protection method? */
	if (((Pepb & 0xF0000000) >> 28) == 0)
		sprintf(str1, "pred"); /* predefined */
	else if (((Pepb & 0xF0000000) >> 28) == 1)
		sprintf(str1, "crc-%lu", 16 * ((Pepb & 0x00000001) + 1)); /* CRC mode */
	else if (((Pepb & 0xF0000000) >> 28) == 2)
		sprintf(str1, "rs(%lu,32)", (Pepb & 0x0000FF00) >> 8); /* RS mode */
	else if (Pepb == 0xFFFFFFFF)
		sprintf(str1, "nometh"); /* RS mode */
	else
		sprintf(str1, "unknown"); /* unknown */

	/* Now we write them to screen */
	if (!conn && post_len)
		opj_event_msg(j2k->cinfo, EVT_INFO,
			"EPB(%d): (%sl, %sp, %u), %lu, %s\n",
			cio_tell(cio) - 13,
			(Depb & 0x40) ? "" : "n", /* latest EPB or not? */
			(Depb & 0x80) ? "" : "n", /* packed or unpacked EPB? */
			(Depb & 0x3F), /* EPB index value */
			LDPepb, /*length of the data protected by the EPB */
			str1); /* protection method */


	/* well, we need to investigate how long is the connected length of packed EPBs */
	myconn = Lepb + 2;
	if ((Depb & 0x40) == 0) /* not latest in header */
		jpwl_epb_correct(j2k,      /* J2K decompressor handle */
					     buffer + Lepb + 2,   /* pointer to next EPB in codestream buffer */
					     2,     /* EPB type: should be of other type */
					     0,  /* only EPB fields */
					     0, /* do not look after */
						 &myconn,
						 NULL
					     );
	if (conn)
		*conn += myconn;

	/*if (!conn)
		printf("connected = %d\n", myconn);*/

	/*cio_seek(j2k->cio, orig_pos);
	return OPJ_TRUE;*/

	/* post-data
	   the position of L4 buffer is at the end of currently connected EPBs
	*/
	if (!(L4_bufp))
		L4_buf = buffer + myconn;
	else if (!(*L4_bufp))
		L4_buf = buffer + myconn;
	else
		L4_buf = *L4_bufp;
	if (post_len == -1) 
		L4 = LDPepb - pre_len - 13;
	else if (post_len == 0)
		L4 = 0;
	else
		L4 = post_len;

	L3_buf = L2_buf;

	/* Do a further check here on the read parameters */
	if (L4 > (unsigned long) cio_numbytesleft(j2k->cio))
		/* overflow */
		return OPJ_FALSE;

	/* we are ready for decoding the remaining data */
	if (((Pepb & 0xF0000000) >> 28) == 1) {
		/* CRC here */
		if ((16 * ((Pepb & 0x00000001) + 1)) == 16) {

			/* CRC-16 */
			unsigned short int mycrc = 0x0000, filecrc = 0x0000;

			/* compute the CRC field */
			remaining = L4;
			while (remaining--)
				jpwl_updateCRC16(&mycrc, *(L4_buf++));

			/* read the CRC field */
			filecrc = *(L3_buf++) << 8;
			filecrc |= *(L3_buf++);

			/* check the CRC field */
			if (mycrc == filecrc) {
				if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_INFO, "- CRC is OK\n");
			} else {
				if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_WARNING, "- CRC is KO (r=%d, c=%d)\n", filecrc, mycrc);
				errflag = OPJ_TRUE;
			}	
		}

		if ((16 * ((Pepb & 0x00000001) + 1)) == 32) {

			/* CRC-32 */
			unsigned long int mycrc = 0x00000000, filecrc = 0x00000000;

			/* compute the CRC field */
			remaining = L4;
			while (remaining--)
				jpwl_updateCRC32(&mycrc, *(L4_buf++));

			/* read the CRC field */
			filecrc = *(L3_buf++) << 24;
			filecrc |= *(L3_buf++) << 16;
			filecrc |= *(L3_buf++) << 8;
			filecrc |= *(L3_buf++);

			/* check the CRC field */
			if (mycrc == filecrc) {
				if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_INFO, "- CRC is OK\n");
			} else {
				if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_WARNING, "- CRC is KO (r=%d, c=%d)\n", filecrc, mycrc);
				errflag = OPJ_TRUE;
			}
		}

	} else if (Pepb == 0xFFFFFFFF) {
		/* no method */

		/* advance without doing anything */
		remaining = L4;
		while (remaining--)
			L4_buf++;

	} else if ((((Pepb & 0xF0000000) >> 28) == 2) || (((Pepb & 0xF0000000) >> 28) == 0)) {
		/* RS coding here */

		if (((Pepb & 0xF0000000) >> 28) == 0) {

			k_post = k_pre;
			n_post = n_pre;

		} else {

			k_post = 32;
			n_post = (Pepb & 0x0000FF00) >> 8;
		}

		/* Initialize RS structures */
		P = n_post - k_post;
		NN_P = NN - P;
		tt = (int) floor((float) P / 2.0F); /* again, correction capability */
		memset(codeword, 0, NN);
		parityword = codeword + NN_P;
		init_rs(NN_P);

		/* Correct post-data message words */
		/*L4_buf = buffer + Lepb + 2;*/
		L3_buf = L2_buf;
		remaining = L4;
		while (remaining) {
 
			/* always zero-pad codewords */
			/* (this is required, since after decoding the zeros in the long codeword
				could change, and keep unchanged in subsequent calls) */
			memset(codeword, 0, NN);

			/* copy codeword buffer into message bytes */
			if (remaining < k_post)
				memcpy(codeword, L4_buf, remaining);
			else
				memcpy(codeword, L4_buf, k_post);

			/* copy redundancy buffer in parity bytes */
			memcpy(parityword, L3_buf, P); 

			/* Decode the buffer and possibly obtain corrected bytes */
			status = eras_dec_rs(codeword, NULL, 0);
			if (status == -1) {
				/*if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_WARNING,
						"Possible decoding error in codeword @ position #%d\n", (L4_buf - (buffer + Lepb + 2)) / k_post);*/
				errflag = OPJ_TRUE;

			} else if (status == 0) {
				/*if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_INFO, "codeword is correctly decoded\n");*/

			} else if (status <= tt) {
				/*if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_WARNING, "%d errors corrected in codeword\n", status);*/
				errnum += status;

			} else {
				/*if (conn == NULL)
					opj_event_msg(j2k->cinfo, EVT_WARNING, "EPB correction capability exceeded\n");
				return OPJ_FALSE;*/
				errflag = OPJ_TRUE;
			}


			/* advance parity buffer */
			if ((status >= 0) && (status <= tt))
				/* copy back corrected data only if all is OK */
				memcpy(L3_buf, parityword, P);
			L3_buf += P;

			/* advance message buffer */
			if (remaining < k_post) {
				if ((status >= 0) && (status <= tt))
					/* copy back corrected data only if all is OK */
					memcpy(L4_buf, codeword, remaining);
				L4_buf += remaining;
				remaining = 0;

			} else {
				if ((status >= 0) && (status <= tt))
					/* copy back corrected data only if all is OK */
					memcpy(L4_buf, codeword, k_post);
				L4_buf += k_post;
				remaining -= k_post;

			}
		}
	}

	/* give back the L4_buf address */
	if (L4_bufp)
		*L4_bufp = L4_buf;

	/* print summary */
	if (!conn) {

		if (errnum)
			opj_event_msg(j2k->cinfo, EVT_INFO, "- %d symbol errors corrected (Ps=%.1e)\n", errnum,
				(float) errnum / (float) LDPepb);
		if (errflag)
			opj_event_msg(j2k->cinfo, EVT_INFO, "- there were unrecoverable errors\n");

	}

	cio_seek(j2k->cio, orig_pos);

	return OPJ_TRUE;
}

void jpwl_epc_write(opj_j2k_t *j2k, jpwl_epc_ms_t *epc, unsigned char *buf) {

	/* Marker */
	*(buf++) = (unsigned char) (J2K_MS_EPC >> 8); 
	*(buf++) = (unsigned char) (J2K_MS_EPC >> 0); 

	/* Lepc */
	*(buf++) = (unsigned char) (epc->Lepc >> 8); 
	*(buf++) = (unsigned char) (epc->Lepc >> 0); 

	/* Pcrc */
	*(buf++) = (unsigned char) (epc->Pcrc >> 8); 
	*(buf++) = (unsigned char) (epc->Pcrc >> 0);

	/* DL */
	*(buf++) = (unsigned char) (epc->DL >> 24); 
	*(buf++) = (unsigned char) (epc->DL >> 16); 
	*(buf++) = (unsigned char) (epc->DL >> 8); 
	*(buf++) = (unsigned char) (epc->DL >> 0); 

	/* Pepc */
	*(buf++) = (unsigned char) (epc->Pepc >> 0); 

	/* Data */
	/*memcpy(buf, epc->data, (size_t) epc->Lepc - 9);*/
	memset(buf, 0, (size_t) epc->Lepc - 9);

	/* update markers struct */
	j2k_add_marker(j2k->cstr_info, J2K_MS_EPC, -1, epc->Lepc + 2);

};

int jpwl_esds_add(opj_j2k_t *j2k, jpwl_marker_t *jwmarker, int *jwmarker_num,
				  int comps, unsigned char addrm, unsigned char ad_size,
				  unsigned char senst, unsigned char se_size,
				  double place_pos, int tileno) {

	return 0;
}

jpwl_esd_ms_t *jpwl_esd_create(opj_j2k_t *j2k, int comp, 
	unsigned char addrm, unsigned char ad_size,
	unsigned char senst, int se_size, int tileno,
	unsigned long int svalnum, void *sensval) {

	jpwl_esd_ms_t *esd = NULL;

	/* Alloc space */
	if (!(esd = (jpwl_esd_ms_t *) opj_malloc((size_t) 1 * sizeof (jpwl_esd_ms_t)))) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Could not allocate room for ESD MS\n");
		return NULL;
	};

	/* if relative sensitivity, activate byte range mode */
	if (senst == 0)
		addrm = 1;

	/* size of sensval's ... */
	if ((ad_size != 0) && (ad_size != 2) && (ad_size != 4)) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Address size %d for ESD MS is forbidden\n", ad_size);
		return NULL;
	}
	if ((se_size != 1) && (se_size != 2)) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Sensitivity size %d for ESD MS is forbidden\n", se_size);
		return NULL;
	}
	
	/* ... depends on the addressing mode */
	switch (addrm) {

	/* packet mode */
	case (0):
		ad_size = 0; /* as per the standard */
		esd->sensval_size = (unsigned int)se_size; 
		break;

	/* byte range */
	case (1):
		/* auto sense address size */
		if (ad_size == 0)
			/* if there are more than 66% of (2^16 - 1) bytes, switch to 4 bytes
			 (we keep space for possible EPBs being inserted) */
			ad_size = (j2k->cstr_info->codestream_size > (1 * 65535 / 3)) ? 4 : 2;
		esd->sensval_size = ad_size + ad_size + se_size; 
		break;

	/* packet range */
	case (2):
		/* auto sense address size */
		if (ad_size == 0)
			/* if there are more than 2^16 - 1 packets, switch to 4 bytes */
			ad_size = (j2k->cstr_info->packno > 65535) ? 4 : 2;
		esd->sensval_size = ad_size + ad_size + se_size; 
		break;

	case (3):
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Address mode %d for ESD MS is unimplemented\n", addrm);
		return NULL;

	default:
		opj_event_msg(j2k->cinfo, EVT_ERROR, "Address mode %d for ESD MS is forbidden\n", addrm);
		return NULL;
	}

	/* set or unset sensitivity values */
	if (svalnum <= 0) {

		switch (senst) {

		/* just based on the portions of a codestream */
		case (0):
			/* MH + no. of THs + no. of packets */
			svalnum = 1 + (j2k->cstr_info->tw * j2k->cstr_info->th) * (1 + j2k->cstr_info->packno);
			break;

		/* all the ones that are based on the packets */
		default:
			if (tileno < 0)
				/* MH: all the packets and all the tiles info is written */
				svalnum = j2k->cstr_info->tw * j2k->cstr_info->th * j2k->cstr_info->packno;
			else
				/* TPH: only that tile info is written */
				svalnum = j2k->cstr_info->packno;
			break;

		}
	}		

	/* fill private fields */
	esd->senst = senst;
	esd->ad_size = ad_size;
	esd->se_size = se_size;
	esd->addrm = addrm;
	esd->svalnum = svalnum;
	esd->numcomps = j2k->image->numcomps;
	esd->tileno = tileno;
	
	/* Set the ESD parameters */
	/* length, excluding data field */
	if (esd->numcomps < 257)
		esd->Lesd = 4 + (unsigned short int) (esd->svalnum * esd->sensval_size);
	else
		esd->Lesd = 5 + (unsigned short int) (esd->svalnum * esd->sensval_size);

	/* component data field */
	if (comp >= 0)
		esd->Cesd = comp;
	else
		/* we are averaging */
		esd->Cesd = 0;

	/* Pesd field */
	esd->Pesd = 0x00;
	esd->Pesd |= (esd->addrm & 0x03) << 6; /* addressing mode */
	esd->Pesd |= (esd->senst & 0x07) << 3; /* sensitivity type */
	esd->Pesd |= ((esd->se_size >> 1) & 0x01) << 2; /* sensitivity size */
	esd->Pesd |= ((esd->ad_size >> 2) & 0x01) << 1; /* addressing size */
	esd->Pesd |= (comp < 0) ? 0x01 : 0x00; /* averaging components */

	/* if pointer to sensval is NULL, we can fill data field by ourselves */
	if (!sensval) {

		/* old code moved to jpwl_esd_fill() */
		esd->data = NULL;

	} else {
			/* we set the data field as the sensitivity values poinnter passed to the function */
			esd->data = (unsigned char *) sensval;
	}

	return (esd);
}

opj_bool jpwl_esd_fill(opj_j2k_t *j2k, jpwl_esd_ms_t *esd, unsigned char *buf) {

	int i;
	unsigned long int vv;
	unsigned long int addr1 = 0L, addr2 = 0L;
	double dvalue = 0.0, Omax2, tmp, TSE = 0.0, MSE, oldMSE = 0.0, PSNR, oldPSNR = 0.0;
	unsigned short int pfpvalue;
	unsigned long int addrmask = 0x00000000;
	opj_bool doneMH = OPJ_FALSE, doneTPH = OPJ_FALSE;

	/* sensitivity values in image info are as follows:
		- for each tile, distotile is the starting distortion for that tile, sum of all components
		- for each packet in a tile, disto is the distortion reduction caused by that packet to that tile
		- the TSE for a single tile should be given by   distotile - sum(disto)  , for all components
		- the MSE for a single tile is given by     TSE / nbpix    , for all components
		- the PSNR for a single tile is given by   10*log10( Omax^2 / MSE)    , for all components
		  (Omax is given by    2^bpp - 1    for unsigned images and by    2^(bpp - 1) - 1    for signed images
	*/

	/* browse all components and find Omax */
	Omax2 = 0.0;
	for (i = 0; i < j2k->image->numcomps; i++) {
		tmp = pow(2.0, (double) (j2k->image->comps[i].sgnd ?
			(j2k->image->comps[i].bpp - 1) : (j2k->image->comps[i].bpp))) - 1;
		if (tmp > Omax2)
			Omax2 = tmp;
	}
	Omax2 = Omax2 * Omax2;

	/* if pointer of esd->data is not null, simply write down all the values byte by byte */
	if (esd->data) {
		for (i = 0; i < (int) esd->svalnum; i++)
			*(buf++) = esd->data[i]; 
		return OPJ_TRUE;
	}

	/* addressing mask */
	if (esd->ad_size == 2)
		addrmask = 0x0000FFFF; /* two bytes */
	else
		addrmask = 0xFFFFFFFF; /* four bytes */

	/* set on precise point where sensitivity starts */
	if (esd->numcomps < 257)
		buf += 6;
	else
		buf += 7;

	/* let's fill the data fields */
	for (vv = (esd->tileno < 0) ? 0 : (j2k->cstr_info->packno * esd->tileno); vv < esd->svalnum; vv++) {

		int thistile = vv / j2k->cstr_info->packno, thispacket = vv % j2k->cstr_info->packno;

		/* skip for the hack some lines below */
		if (thistile == j2k->cstr_info->tw * j2k->cstr_info->th)
			break;

		/* starting tile distortion */
		if (thispacket == 0) {
			TSE = j2k->cstr_info->tile[thistile].distotile;
			oldMSE = TSE / j2k->cstr_info->tile[thistile].numpix;
			oldPSNR = 10.0 * log10(Omax2 / oldMSE);
		}

		/* TSE */
		TSE -= j2k->cstr_info->tile[thistile].packet[thispacket].disto;

		/* MSE */
		MSE = TSE / j2k->cstr_info->tile[thistile].numpix;

		/* PSNR */
		PSNR = 10.0 * log10(Omax2 / MSE);

		/* fill the address range */
		switch (esd->addrm) {

		/* packet mode */
		case (0):
			/* nothing, there is none */
			break;

		/* byte range */
		case (1):
			/* start address of packet */
			addr1 = (j2k->cstr_info->tile[thistile].packet[thispacket].start_pos) & addrmask;
			/* end address of packet */
			addr2 = (j2k->cstr_info->tile[thistile].packet[thispacket].end_pos) & addrmask;
			break;

		/* packet range */
		case (2):
			/* not implemented here */
			opj_event_msg(j2k->cinfo, EVT_WARNING, "Addressing mode packet_range is not implemented\n");
			break;

		/* unknown addressing method */
		default:
			/* not implemented here */
			opj_event_msg(j2k->cinfo, EVT_WARNING, "Unknown addressing mode\n");
			break;

		}

		/* hack for writing relative sensitivity of MH and TPHs */
		if ((esd->senst == 0) && (thispacket == 0)) {

			/* possible MH */
			if ((thistile == 0) && !doneMH) {
				/* we have to manage MH addresses */
				addr1 = 0; /* start of MH */
				addr2 = j2k->cstr_info->main_head_end; /* end of MH */
				/* set special dvalue for this MH */
				dvalue = -10.0;
				doneMH = OPJ_TRUE; /* don't come here anymore */
				vv--; /* wrap back loop counter */

			} else if (!doneTPH) {
				/* we have to manage TPH addresses */
				addr1 = j2k->cstr_info->tile[thistile].start_pos;
				addr2 = j2k->cstr_info->tile[thistile].end_header;
				/* set special dvalue for this TPH */
				dvalue = -1.0;
				doneTPH = OPJ_TRUE; /* don't come here till the next tile */
				vv--; /* wrap back loop counter */
			}

		} else
			doneTPH = OPJ_FALSE; /* reset TPH counter */

		/* write the addresses to the buffer */
		switch (esd->ad_size) {

		case (0):
			/* do nothing */
			break;

		case (2):
			/* two bytes */
			*(buf++) = (unsigned char) (addr1 >> 8); 
			*(buf++) = (unsigned char) (addr1 >> 0); 
			*(buf++) = (unsigned char) (addr2 >> 8); 
			*(buf++) = (unsigned char) (addr2 >> 0); 
			break;

		case (4):
			/* four bytes */
			*(buf++) = (unsigned char) (addr1 >> 24); 
			*(buf++) = (unsigned char) (addr1 >> 16); 
			*(buf++) = (unsigned char) (addr1 >> 8); 
			*(buf++) = (unsigned char) (addr1 >> 0); 
			*(buf++) = (unsigned char) (addr2 >> 24); 
			*(buf++) = (unsigned char) (addr2 >> 16); 
			*(buf++) = (unsigned char) (addr2 >> 8); 
			*(buf++) = (unsigned char) (addr2 >> 0); 
			break;

		default:
			/* do nothing */
			break;
		}


		/* let's fill the value field */
		switch (esd->senst) {

		/* relative sensitivity */
		case (0):
			/* we just write down the packet ordering */
			if (dvalue == -10)
				/* MH */
				dvalue = MAX_V1 + 1000.0; /* this will cause pfpvalue set to 0xFFFF */
			else if (dvalue == -1)
				/* TPH */
				dvalue = MAX_V1 + 1000.0; /* this will cause pfpvalue set to 0xFFFF */
			else
				/* packet: first is most important, and then in decreasing order
				down to the last, which counts for 1 */
				dvalue = jpwl_pfp_to_double((unsigned short) (j2k->cstr_info->packno - thispacket), esd->se_size);
			break;

		/* MSE */
		case (1):
			/* !!! WRONG: let's put here disto field of packets !!! */
			dvalue = MSE;
			break;

		/* MSE reduction */
		case (2):
			dvalue = oldMSE - MSE;
			oldMSE = MSE;
			break;

		/* PSNR */
		case (3):
			dvalue = PSNR;
			break;

		/* PSNR increase */
		case (4):
			dvalue = PSNR - oldPSNR;
			oldPSNR = PSNR;
			break;

		/* MAXERR */
		case (5):
			dvalue = 0.0;
			opj_event_msg(j2k->cinfo, EVT_WARNING, "MAXERR sensitivity mode is not implemented\n");
			break;

		/* TSE */
		case (6):
			dvalue = TSE;
			break;

		/* reserved */
		case (7):
			dvalue = 0.0;
			opj_event_msg(j2k->cinfo, EVT_WARNING, "Reserved sensitivity mode is not implemented\n");
			break;

		default:
			dvalue = 0.0;
			break;
		}

		/* compute the pseudo-floating point value */
		pfpvalue = jpwl_double_to_pfp(dvalue, esd->se_size);

		/* write the pfp value to the buffer */
		switch (esd->se_size) {

		case (1):
			/* one byte */
			*(buf++) = (unsigned char) (pfpvalue >> 0); 
			break;

		case (2):
			/* two bytes */
			*(buf++) = (unsigned char) (pfpvalue >> 8); 
			*(buf++) = (unsigned char) (pfpvalue >> 0); 
			break;
		}

	}

	return OPJ_TRUE;
}

void jpwl_esd_write(opj_j2k_t *j2k, jpwl_esd_ms_t *esd, unsigned char *buf) {

	/* Marker */
	*(buf++) = (unsigned char) (J2K_MS_ESD >> 8); 
	*(buf++) = (unsigned char) (J2K_MS_ESD >> 0); 

	/* Lesd */
	*(buf++) = (unsigned char) (esd->Lesd >> 8); 
	*(buf++) = (unsigned char) (esd->Lesd >> 0); 

	/* Cesd */
	if (esd->numcomps >= 257)
		*(buf++) = (unsigned char) (esd->Cesd >> 8); 
	*(buf++) = (unsigned char) (esd->Cesd >> 0); 

	/* Pesd */
	*(buf++) = (unsigned char) (esd->Pesd >> 0); 

	/* Data */
	if (esd->numcomps < 257)
		memset(buf, 0xAA, (size_t) esd->Lesd - 4);
		/*memcpy(buf, esd->data, (size_t) esd->Lesd - 4);*/
	else
		memset(buf, 0xAA, (size_t) esd->Lesd - 5);
		/*memcpy(buf, esd->data, (size_t) esd->Lesd - 5);*/

	/* update markers struct */
	j2k_add_marker(j2k->cstr_info, J2K_MS_ESD, -1, esd->Lesd + 2);

}

unsigned short int jpwl_double_to_pfp(double V, int bytes) {

	unsigned short int em, e, m;

	switch (bytes) {

	case (1):

		if (V < MIN_V1) {
			e = 0x0000;
			m = 0x0000;
		} else if (V > MAX_V1) {
			e = 0x000F;
			m = 0x000F;
		} else {
			e = (unsigned short int) (floor(log(V) * 1.44269504088896) / 4.0);
			m = (unsigned short int) (0.5 + (V / (pow(2.0, (double) (4 * e)))));
		}
		em = ((e & 0x000F) << 4) + (m & 0x000F);		
		break;

	case (2):

		if (V < MIN_V2) {
			e = 0x0000;
			m = 0x0000;
		} else if (V > MAX_V2) {
			e = 0x001F;
			m = 0x07FF;
		} else {
			e = (unsigned short int) floor(log(V) * 1.44269504088896) + 15;
			m = (unsigned short int) (0.5 + 2048.0 * ((V / (pow(2.0, (double) e - 15.0))) - 1.0));
		}
		em = ((e & 0x001F) << 11) + (m & 0x07FF);
		break;

	default:

		em = 0x0000;
		break;
	};

	return em;
}

double jpwl_pfp_to_double(unsigned short int em, int bytes) {

	double V;

	switch (bytes) {

	case 1:
		V = (double) (em & 0x0F) * pow(2.0, (double) (em & 0xF0));
		break;

	case 2:

		V = pow(2.0, (double) ((em & 0xF800) >> 11) - 15.0) * (1.0 + (double) (em & 0x07FF) / 2048.0);
		break;

	default:
		V = 0.0;
		break;

	}

	return V;

}

opj_bool jpwl_update_info(opj_j2k_t *j2k, jpwl_marker_t *jwmarker, int jwmarker_num) {

	int mm;
	unsigned long int addlen;

	opj_codestream_info_t *info = j2k->cstr_info;
	int tileno, tpno, packno, numtiles = info->th * info->tw, numpacks = info->packno;

	if (!j2k || !jwmarker ) {
		opj_event_msg(j2k->cinfo, EVT_ERROR, "J2K handle or JPWL markers list badly allocated\n");
		return OPJ_FALSE;
	}

	/* main_head_end: how many markers are there before? */
	addlen = 0;
	for (mm = 0; mm < jwmarker_num; mm++)
		if (jwmarker[mm].pos < (unsigned long int) info->main_head_end)
			addlen += jwmarker[mm].len + 2;
	info->main_head_end += addlen;

	/* codestream_size: always increment with all markers */
	addlen = 0;
	for (mm = 0; mm < jwmarker_num; mm++)
		addlen += jwmarker[mm].len + 2;
	info->codestream_size += addlen;

	/* navigate through all the tiles */
	for (tileno = 0; tileno < numtiles; tileno++) {

		/* start_pos: increment with markers before SOT */
		addlen = 0;
		for (mm = 0; mm < jwmarker_num; mm++)
			if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].start_pos)
				addlen += jwmarker[mm].len + 2;
		info->tile[tileno].start_pos += addlen;

		/* end_header: increment with markers before of it */
		addlen = 0;
		for (mm = 0; mm < jwmarker_num; mm++)
			if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].end_header)
				addlen += jwmarker[mm].len + 2;
		info->tile[tileno].end_header += addlen;

		/* end_pos: increment with markers before the end of this tile */
		/* code is disabled, since according to JPWL no markers can be beyond TPH */
		addlen = 0;
		for (mm = 0; mm < jwmarker_num; mm++)
			if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].end_pos)
				addlen += jwmarker[mm].len + 2;
		info->tile[tileno].end_pos += addlen;

		/* navigate through all the tile parts */
		for (tpno = 0; tpno < info->tile[tileno].num_tps; tpno++) {

			/* start_pos: increment with markers before SOT */
			addlen = 0;
			for (mm = 0; mm < jwmarker_num; mm++)
				if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].tp[tpno].tp_start_pos)
					addlen += jwmarker[mm].len + 2;
			info->tile[tileno].tp[tpno].tp_start_pos += addlen;

			/* end_header: increment with markers before of it */
			addlen = 0;
			for (mm = 0; mm < jwmarker_num; mm++)
				if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].tp[tpno].tp_end_header)
					addlen += jwmarker[mm].len + 2;
			info->tile[tileno].tp[tpno].tp_end_header += addlen;

			/* end_pos: increment with markers before the end of this tile part */
			addlen = 0;
			for (mm = 0; mm < jwmarker_num; mm++)
				if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].tp[tpno].tp_end_pos)
					addlen += jwmarker[mm].len + 2;
			info->tile[tileno].tp[tpno].tp_end_pos += addlen;

		}

		/* navigate through all the packets in this tile */
		for (packno = 0; packno < numpacks; packno++) {
			
			/* start_pos: increment with markers before the packet */
			/* disabled for the same reason as before */
			addlen = 0;
			for (mm = 0; mm < jwmarker_num; mm++)
				if (jwmarker[mm].pos <= (unsigned long int) info->tile[tileno].packet[packno].start_pos)
					addlen += jwmarker[mm].len + 2;
			info->tile[tileno].packet[packno].start_pos += addlen;

			/* end_ph_pos: increment with markers before the packet */
			/* disabled for the same reason as before */
			/*addlen = 0;
			for (mm = 0; mm < jwmarker_num; mm++)
				if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].packet[packno].end_ph_pos)
					addlen += jwmarker[mm].len + 2;*/
			info->tile[tileno].packet[packno].end_ph_pos += addlen;

			/* end_pos: increment if marker is before the end of packet */
			/* disabled for the same reason as before */
			/*addlen = 0;
			for (mm = 0; mm < jwmarker_num; mm++)
				if (jwmarker[mm].pos < (unsigned long int) info->tile[tileno].packet[packno].end_pos)
					addlen += jwmarker[mm].len + 2;*/
			info->tile[tileno].packet[packno].end_pos += addlen;

		}
	}

	/* reorder the markers list */

	return OPJ_TRUE;
}

#endif /* USE_JPWL */