/*
 * Copyright (c) 2001-2002, David Janssens
 * Copyright (c) 2002-2004, Yannick Verschueren
 * Copyright (c) 2002-2004, 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.
 */

#include "t2.h"
#include "tcd.h"
#include "bio.h"
#include "j2k.h"
#include "pi.h"
#include "tgt.h"
#include "int.h"
#include "cio.h"
#include <stdio.h>
#include <setjmp.h>
#include <string.h>
#include <stdlib.h>

#define RESTART 0x04

extern jmp_buf j2k_error;

void t2_putcommacode(int n)
{
	while (--n >= 0) {
		bio_write(1, 1);
	}
	bio_write(0, 1);
}

int t2_getcommacode()
{
	int n;
	for (n = 0; bio_read(1); n++) {
	}
	return n;
}

/* <summary> */
/* Variable length code for signalling delta Zil (truncation point) */
/* <val> n : delta Zil */
/* <\summary> */
void t2_putnumpasses(int n)
{
	if (n == 1) {
		bio_write(0, 1);
	} else if (n == 2) {
		bio_write(2, 2);
	} else if (n <= 5) {
		bio_write(0xc | (n - 3), 4);
	} else if (n <= 36) {
		bio_write(0x1e0 | (n - 6), 9);
	} else if (n <= 164) {
		bio_write(0xff80 | (n - 37), 16);
	}
}

int t2_getnumpasses()
{
	int n;
	if (!bio_read(1))
		return 1;
	if (!bio_read(1))
		return 2;
	if ((n = bio_read(2)) != 3)
		return 3 + n;
	if ((n = bio_read(5)) != 31)
		return 6 + n;
	return 37 + bio_read(7);
}

/*
 * Encode a packet of a tile to a destination buffer
 *
 * Tile    : the tile for which to write the packets
 * tcp     : the tile coding parameters
 * compno  : Identity of the packet --> component value
 * resno   : Identity of the packet --> resolution level value
 * precno  : Identity of the packet --> precinct value
 * layno   : Identity of the packet --> quality layer value
 * dest    : the destination buffer
 * len     : the length of the destination buffer
 * info_IM : structure to create an index file
 * tileno  : number of the tile encoded
*/
int t2_encode_packet(tcd_tile_t * tile, j2k_tcp_t * tcp, int compno, int resno, int precno, int layno, unsigned char *dest,
		     int len, info_image * info_IM, int tileno)
{
	int bandno, cblkno;
	unsigned char *sop = 0, *eph = 0;
	tcd_tilecomp_t *tilec = &tile->comps[compno];
	tcd_resolution_t *res = &tilec->resolutions[resno];
	unsigned char *c = dest;

	/* <SOP 0xff91> */
	if (tcp->csty & J2K_CP_CSTY_SOP) {
		sop = (unsigned char *) malloc(6 * sizeof(unsigned char));
		sop[0] = 255;
		sop[1] = 145;
		sop[2] = 0;
		sop[3] = 4;
		sop[4] = (info_IM->num % 65536) / 256;
		sop[5] = (info_IM->num % 65536) % 256;
		memcpy(c, sop, 6);
		free(sop);
		c += 6;
	}
	/* </SOP> */

	if (!layno) {
		for (bandno = 0; bandno < res->numbands; bandno++) {
			tcd_band_t *band = &res->bands[bandno];
			tcd_precinct_t *prc = &band->precincts[precno];
			tgt_reset(prc->incltree);
			tgt_reset(prc->imsbtree);
			for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
				tcd_cblk_t *cblk = &prc->cblks[cblkno];
				cblk->numpasses = 0;
				tgt_setvalue(prc->imsbtree, cblkno, band->numbps - cblk->numbps);
			}
		}
	}

	bio_init_enc(c, len);
	bio_write(1, 1);  /* Empty header bit */

	/* Writing Packet header */
	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_layer_t *layer = &cblk->layers[layno];
			if (!cblk->numpasses && layer->numpasses) {
				tgt_setvalue(prc->incltree, cblkno, layno);
			}
		}
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_layer_t *layer = &cblk->layers[layno];
			int increment = 0;
			int nump = 0;
			int len = 0, passno;
			/* cblk inclusion bits */
			if (!cblk->numpasses) {
				tgt_encode(prc->incltree, cblkno, layno + 1);
			} else {
				bio_write(layer->numpasses != 0, 1);
			}
			/* if cblk not included, go to the next cblk  */
			if (!layer->numpasses) {
				continue;
			}
			/* if first instance of cblk --> zero bit-planes information */
			if (!cblk->numpasses) {
				cblk->numlenbits = 3;
				tgt_encode(prc->imsbtree, cblkno, 999);
			}
			/* number of coding passes included */
			t2_putnumpasses(layer->numpasses);

			/* computation of the increase of the length indicator and insertion in the header     */
			for (passno = cblk->numpasses;
					 passno < cblk->numpasses + layer->numpasses; passno++) {
				tcd_pass_t *pass = &cblk->passes[passno];
				nump++;
				len += pass->len;
				if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
				  increment = int_max(increment, int_floorlog2(len) + 1 - (cblk->numlenbits + int_floorlog2(nump)));
				  len = 0;
				  nump = 0;
				}
			}
			t2_putcommacode(increment);
			/* computation of the new Length indicator */
			cblk->numlenbits += increment;
			/* insertion of the codeword segment length */

			for (passno = cblk->numpasses;
					 passno < cblk->numpasses + layer->numpasses; passno++) {
				tcd_pass_t *pass = &cblk->passes[passno];
				nump++;
				len += pass->len;
				if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
				  bio_write(len, cblk->numlenbits + int_floorlog2(nump));
				  len = 0;
				  nump = 0;
				}
			}
		}
	}

	if (bio_flush())
		return -999;		/* modified to eliminate longjmp !! */

	c += bio_numbytes();

	/* <EPH 0xff92> */
	if (tcp->csty & J2K_CP_CSTY_EPH) {
		eph = (unsigned char *) malloc(2 * sizeof(unsigned char));
		eph[0] = 255;
		eph[1] = 146;
		memcpy(c, eph, 2);
		free(eph);
		c += 2;
	}
	/* </EPH> */

	/* Writing the packet body */

	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_layer_t *layer = &cblk->layers[layno];
			if (!layer->numpasses) {	/* ADD for index Cfr. Marcela --> delta disto by packet */
				if (info_IM->index_write && info_IM->index_on) {
					info_tile *info_TL = &info_IM->tile[tileno];
					info_packet *info_PK = &info_TL->packet[info_IM->num];
					info_PK->disto = layer->disto;
					if (info_IM->D_max < info_PK->disto)
						info_IM->D_max = info_PK->disto;
				}			/* </ADD> */
				continue;
			}
			if (c + layer->len > dest + len) {
				return -999;
			}

			memcpy(c, layer->data, layer->len);
			cblk->numpasses += layer->numpasses;
			c += layer->len;
			/* ADD for index Cfr. Marcela --> delta disto by packet */
			if (info_IM->index_write && info_IM->index_on) {
				info_tile *info_TL = &info_IM->tile[tileno];
				info_packet *info_PK = &info_TL->packet[info_IM->num];
				info_PK->disto = layer->disto;
				if (info_IM->D_max < info_PK->disto)
					info_IM->D_max = info_PK->disto;
			}		/* </ADD> */
		}
	}
	return c - dest;
}

void t2_init_seg(tcd_seg_t * seg, int cblksty, int first)
{
	seg->numpasses = 0;
	seg->len = 0;
	if (cblksty & J2K_CCP_CBLKSTY_TERMALL)
		seg->maxpasses = 1;
	else if (cblksty & J2K_CCP_CBLKSTY_LAZY) {
		if (first)
			seg->maxpasses = 10;
		else
			seg->maxpasses = (((seg - 1)->maxpasses == 1) || ((seg - 1)->maxpasses == 10)) ? 2 : 1;
	} else
		seg->maxpasses = 109;
}

/*  
 * Decode a packet of a tile from a source buffer
 *
 * src          : the source buffer
 * len          : the length of the source buffer
 * tile         : the tile for which to write the packets
 * cp           : the image coding parameters
 * tcp          : the tile coding parameters
 * compno  : Identity of the packet --> component value
 * resno      : Identity of the packet --> resolution level value
 * precno    : Identity of the packet --> precinct value
 * layno      : Identity of the packet --> quality layer value
 */
int t2_decode_packet(unsigned char *src, int len, tcd_tile_t * tile, j2k_cp_t * cp, j2k_tcp_t * tcp, int compno, int resno, int precno, int layno)
{
	int bandno, cblkno;
	tcd_tilecomp_t *tilec = &tile->comps[compno];
	tcd_resolution_t *res = &tilec->resolutions[resno];
	unsigned char *c = src;
	int present;

	if (layno == 0) {
		for (bandno = 0; bandno < res->numbands; bandno++) {
			tcd_band_t *band = &res->bands[bandno];
			tcd_precinct_t *prc = &band->precincts[precno];
			tgt_reset(prc->incltree);
			tgt_reset(prc->imsbtree);
			for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
				tcd_cblk_t *cblk = &prc->cblks[cblkno];
				cblk->numsegs = 0;
			}
		}
	}

	/* When the marker PPT/PPM is used the packet header are store in PPT/PPM marker
	   This part deal with this caracteristic
	   step 1: Read packet header in the saved structure
	   step 2: (futher) return to codestream for decoding */
	if (cp->ppm == 1) /* PPM */
	  {	    
	    c=cp->ppm_data;
	    bio_init_dec(c,1000);
	  } else 
	    {
	      if (tcp->ppt==1) /* PPT */
		{
		  c=tcp->ppt_data;
		  bio_init_dec(c,1000);
		} else /* Normal Case */
		  {
		    if (tcp->csty & J2K_CP_CSTY_SOP) 
		      {
			if ((*c)!=255 || (*(c+1)!=145)) {printf("Error : expected SOP marker [1]!!!\n");}
			/*printf(" %d %d %d %d %d %d %d\n",*c,*(c+1),*(c+6),*(c+7),*(c+8),*(c+9),*(c+10));*/
			c += 6;
		      }
		    bio_init_dec(c, src + len - c);
		  }
	    }

	present = bio_read(1);

	if (!present) 
	  {
	    bio_inalign();
	    /* Normal case */
	    c += bio_numbytes();
	    if (tcp->csty & J2K_CP_CSTY_EPH) 
	      {
		if ((*c)!=255 || (*(c+1)!=146)) {printf("Error : expected EPH marker [1]!!!\n");}
		c += 2;
	      }
	    
	    /* PPT and PPM dealing */
	    if (cp->ppm == 1) /* PPM */
	      {	
		cp->ppm_data=c;
		return 0;
	      }
	    if (tcp->ppt==1) /* PPT */
	      {
		tcp->ppt_data=c;
		return 0;
	      }
	    return c - src;
	  }
	for (bandno = 0; bandno < res->numbands; bandno++) {
	  tcd_band_t *band = &res->bands[bandno];
	  tcd_precinct_t *prc = &band->precincts[precno];
	  for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
	    int included, increment, n;
	    tcd_cblk_t *cblk = &prc->cblks[cblkno];
	    tcd_seg_t *seg;
	    /* if cblk not yet included before --> inclusion tagtree */
	    if (!cblk->numsegs) {
	      included = tgt_decode(prc->incltree, cblkno, layno + 1);
				/* else one bit */
	    } else {
	      included = bio_read(1);
	    }
	    /* if cblk not included */
	    if (!included) {
	      cblk->numnewpasses = 0;
	      continue;
	    }
	    /* if cblk not yet included --> zero-bitplane tagtree */
	    if (!cblk->numsegs) {
	      int i, numimsbs;
	      for (i = 0; !tgt_decode(prc->imsbtree, cblkno, i); i++) {
	      }
	      numimsbs = i - 1;
	      cblk->numbps = band->numbps - numimsbs;
	      cblk->numlenbits = 3;
	    }
	    /* number of coding passes */
	    cblk->numnewpasses = t2_getnumpasses();
	    increment = t2_getcommacode();
	    /* length indicator increment */
	    cblk->numlenbits += increment;
	    if (!cblk->numsegs) {
	      seg = &cblk->segs[0];
	      t2_init_seg(seg, tcp->tccps[compno].cblksty, 1);
	    } else {
	      seg = &cblk->segs[cblk->numsegs - 1];
	      if (seg->numpasses == seg->maxpasses) {
		t2_init_seg(++seg, tcp->tccps[compno].cblksty, 0);
	      }
	    }
	    n = cblk->numnewpasses;

	    do {
	      seg->numnewpasses = int_min(seg->maxpasses - seg->numpasses, n);
	      seg->newlen = bio_read(cblk->numlenbits + int_floorlog2(seg->numnewpasses));
	      n -= seg->numnewpasses;
	      if (n > 0) {
		t2_init_seg(++seg, tcp->tccps[compno].cblksty, 0);
	      }
	    } while (n > 0);
	  }
	}
	if (bio_inalign())
	  return -999;

	c += bio_numbytes();

	if (tcp->csty & J2K_CP_CSTY_EPH) { /* EPH marker */
	  if ((*c)!=255 || (*(c+1)!=146)) { printf("Error : expected EPH marker [2]!!!\n"); 
	  printf(" %d %d %d %d %d %d %d\n",*c,*(c+1),*(c+2),*(c+3),*(c+4),*(c+5),*(c+6));}
	  c += 2;
	}
	
	/* PPT Step 2 : see above for details */
	if (cp->ppm==1)
	  {
	    cp->ppm_data=c; /* Update pointer */
	    
	    c=src;
	    if (tcp->csty & J2K_CP_CSTY_SOP) 
	      {
		if ((*c)!=255 || (*(c+1)!=145)) {printf("Error : expected SOP marker [2] !!!\n"); }
		c += 6;
	      }
	    bio_init_dec(c,src + len - c);
	  } else 
	    {
	      if (tcp->ppt==1)
		{ 
		  tcp->ppt_data=c; /* Update pointer */
		  c=src;
		  if (tcp->csty & J2K_CP_CSTY_SOP) /* SOP marker */
		    { 
		      if ((*c)!=255 || (*(c+1)!=145)) {printf("Error : expected SOP marker [2] !!!\n"); }
		      c += 6;
		    }
		  bio_init_dec(c,src + len - c);

		}
	    }
	
	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_seg_t *seg;
			if (!cblk->numnewpasses)
				continue;
			if (!cblk->numsegs) {
				seg = &cblk->segs[cblk->numsegs++];
				cblk->len = 0;
			} else {
				seg = &cblk->segs[cblk->numsegs - 1];
				if (seg->numpasses == seg->maxpasses) {
					seg++;
					cblk->numsegs++;
				}
			}
			do {
			  if (c + seg->newlen > src + len){
			    return -999;}
			  
			  memcpy(cblk->data + cblk->len, c, seg->newlen);
			  if (seg->numpasses == 0) {
			    seg->data = cblk->data + cblk->len;
			  }
			  c += seg->newlen;
			  cblk->len += seg->newlen;
			  seg->len += seg->newlen;
			  seg->numpasses += seg->numnewpasses;
			  cblk->numnewpasses -= seg->numnewpasses;
			  if (cblk->numnewpasses > 0) {
			    seg++;
			    cblk->numsegs++;
			  }
			} while (cblk->numnewpasses > 0);
		}
	}

	return c - src;
}



/*
 * Encode the packets of a tile to a destination buffer
 *
 * img        : the source image
 * cp         : the image coding parameters
 * tileno     : number of the tile encoded
 * tile       : the tile for which to write the packets
 * maxlayers  : maximum number of layers
 * dest       : the destination buffer
 * len        : the length of the destination buffer
 * info_IM    : structure to create an index file
 */
int t2_encode_packets(j2k_image_t * img, j2k_cp_t * cp, int tileno, tcd_tile_t * tile, int maxlayers, unsigned char *dest, int len, info_image * info_IM)
{
	unsigned char *c = dest;
	int e = 0;
	pi_iterator_t *pi;
	int pino, compno;

	pi = pi_create(img, cp, tileno);
	
	for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
		while (pi_next(&pi[pino])) {
			if (pi[pino].layno < maxlayers) {
			  e = t2_encode_packet(tile, &cp->tcps[tileno], pi[pino].compno, 
					       pi[pino].resno, pi[pino].precno, pi[pino].layno,
					       c, dest + len - c, info_IM, tileno);
			  if (e == -999) {
			    break;
			  } else
			    c += e;
				/* INDEX >> */
			  if (info_IM->index_write && info_IM->index_on) {
			    info_tile *info_TL = &info_IM->tile[tileno];
			    info_packet *info_PK = &info_TL->packet[info_IM->num];
			    if (!info_IM->num) {
			      info_PK->start_pos = info_TL->end_header + 1;
			    } else {
			      info_PK->start_pos =
				info_TL->packet[info_IM->num - 1].end_pos + 1;
			    }
			    info_PK->end_pos = info_PK->start_pos + e - 1;
			    
			  }
				/* << INDEX */
			  if ((info_IM->index_write
			       && cp->tcps[tileno].csty & J2K_CP_CSTY_SOP)
			      || (info_IM->index_write && info_IM->index_on)) {
			    info_IM->num++;
			  }
			}

		}

		/* FREE space memory taken by pi */
		for (compno = 0; compno < pi[pino].numcomps; compno++) {
			free(pi[pino].comps[compno].resolutions);
		}
		free(pi[pino].comps);
	}
	free(pi[0].include);
	free(pi);
	if (e == -999)
		return e;
	else
		return c - dest;
}



/*
 * Decode the packets of a tile from a source buffer
 *
 * src: the source buffer
 * len: length of the source buffer
 * img: destination image
 * cp: image coding parameters
 * tileno: number that identifies the tile for which to decode the packets
 * tile: tile for which to decode the packets
 */
int t2_decode_packets(unsigned char *src, int len, j2k_image_t * img, j2k_cp_t * cp, int tileno, tcd_tile_t * tile)
{
	unsigned char *c = src;
	pi_iterator_t *pi;
	int pino, compno, e = 0;
	int n=0;

	pi = pi_create(img, cp, tileno);
	
	for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
	  while (pi_next(&pi[pino])) 
	    { 
	      //   fprintf(stderr,"codeblock %d [%d %d %d %d] pino %d/%d\n",n,pi[pino].layno,pi[pino].resno,pi[pino].compno,pi[pino].precno,pino,cp->tcps[tileno].numpocs);
	      e = t2_decode_packet(c, src + len - c, tile, cp, &cp->tcps[tileno], pi[pino].compno, 
				   pi[pino].resno, pi[pino].precno, pi[pino].layno); 
	      n++;
	 
	      if (e == -999) {		/* ADD */
		break;
	      } else
		c += e;
	      /*  printf("next\n"); */
	    }

	  /* FREE space memory taken by pi */
	  for (compno = 0; compno < pi[pino].numcomps; compno++) {
	    free(pi[pino].comps[compno].resolutions);
	  }
	  free(pi[pino].comps);
	}
	free(pi[0].include);
	free(pi);
	
	if (e == -999)
	  return e;
	else
	  return c - src;
}