/*
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
 * Copyright (c) 2005, Herv Drolon, FreeImage Team
 * Copyright (c) 2002-2005, 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 "opj_includes.h"

/** @defgroup T2 T2 - Implementation of a tier-2 coding */
/*@{*/

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

static void t2_putcommacode(opj_bio_t *bio, int n);
static int t2_getcommacode(opj_bio_t *bio);
/**
Variable length code for signalling delta Zil (truncation point)
@param bio Bit Input/Output component
@param n delta Zil
*/
static void t2_putnumpasses(opj_bio_t *bio, int n);
static int t2_getnumpasses(opj_bio_t *bio);
/**
Encode a packet of a tile to a destination buffer
@param tile Tile for which to write the packets
@param tcp Tile coding parameters
@param pi Packet identity
@param dest Destination buffer
@param len Length of the destination buffer
@param image_info Structure to create an index file
@param tileno Number of the tile encoded
@return 
*/
static int t2_encode_packet(opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi, unsigned char *dest, int len, opj_image_info_t *image_info, int tileno);
/**
@param seg
@param cblksty
@param first
*/
static void t2_init_seg(opj_tcd_seg_t *seg, int cblksty, int first);
/**
Decode a packet of a tile from a source buffer
@param t2 T2 handle
@param src Source buffer
@param len Length of the source buffer
@param tile Tile for which to write the packets
@param tcp Tile coding parameters
@param pi Packet identity
@return 
*/
static int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len, opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi);

/*@}*/

/*@}*/

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

/* #define RESTART 0x04 */

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

static int t2_getcommacode(opj_bio_t *bio) {
  int n;
  for (n = 0; bio_read(bio, 1); n++) {
    ;
  }
  return n;
}

static void t2_putnumpasses(opj_bio_t *bio, int n) {
  if (n == 1) {
    bio_write(bio, 0, 1);
  } else if (n == 2) {
    bio_write(bio, 2, 2);
  } else if (n <= 5) {
    bio_write(bio, 0xc | (n - 3), 4);
  } else if (n <= 36) {
    bio_write(bio, 0x1e0 | (n - 6), 9);
  } else if (n <= 164) {
    bio_write(bio, 0xff80 | (n - 37), 16);
  }
}

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

static int t2_encode_packet(opj_tcd_tile_t * tile, opj_tcp_t * tcp, opj_pi_iterator_t *pi, unsigned char *dest, int len, opj_image_info_t * image_info, int tileno) {
  int bandno, cblkno;
  unsigned char *sop = 0, *eph = 0;
  unsigned char *c = dest;

  int compno = pi->compno;  /* component value */
  int resno  = pi->resno;    /* resolution level value */
  int precno = pi->precno;  /* precinct value */
  int layno  = pi->layno;    /* quality layer value */

  opj_tcd_tilecomp_t *tilec = &tile->comps[compno];
  opj_tcd_resolution_t *res = &tilec->resolutions[resno];
  
  opj_bio_t *bio = NULL;  /* BIO component */
  
  /* <SOP 0xff91> */
  if (tcp->csty & J2K_CP_CSTY_SOP) {
    sop = (unsigned char *) opj_malloc(6 * sizeof(unsigned char));
    sop[0] = 255;
    sop[1] = 145;
    sop[2] = 0;
    sop[3] = 4;
    sop[4] = (image_info->num % 65536) / 256;
    sop[5] = (image_info->num % 65536) % 256;
    memcpy(c, sop, 6);
    opj_free(sop);
    c += 6;
  }
  /* </SOP> */
  
  if (!layno) {
    for (bandno = 0; bandno < res->numbands; bandno++) {
      opj_tcd_band_t *band = &res->bands[bandno];
      opj_tcd_precinct_t *prc = &band->precincts[precno];
      tgt_reset(prc->incltree);
      tgt_reset(prc->imsbtree);
      for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
        opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
        cblk->numpasses = 0;
        tgt_setvalue(prc->imsbtree, cblkno, band->numbps - cblk->numbps);
      }
    }
  }
  
  bio = bio_create();
  bio_init_enc(bio, c, len);
  bio_write(bio, 1, 1);    /* Empty header bit */
  
  /* Writing Packet header */
  for (bandno = 0; bandno < res->numbands; bandno++) {
    opj_tcd_band_t *band = &res->bands[bandno];
    opj_tcd_precinct_t *prc = &band->precincts[precno];
    for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
      opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
      opj_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++) {
      opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
      opj_tcd_layer_t *layer = &cblk->layers[layno];
      int increment = 0;
      int nump = 0;
      int lenv = 0, passno;
      /* cblk inclusion bits */
      if (!cblk->numpasses) {
        tgt_encode(bio, prc->incltree, cblkno, layno + 1);
      } else {
        bio_write(bio, 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(bio, prc->imsbtree, cblkno, 999);
      }
      /* number of coding passes included */
      t2_putnumpasses(bio, 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++) {
        opj_tcd_pass_t *pass = &cblk->passes[passno];
        nump++;
        lenv += pass->len;
        if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
          increment = int_max(increment, int_floorlog2(lenv) + 1 - (cblk->numlenbits + int_floorlog2(nump)));
          lenv = 0;
          nump = 0;
        }
      }
      t2_putcommacode(bio, 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++) {
        opj_tcd_pass_t *pass = &cblk->passes[passno];
        nump++;
        lenv += pass->len;
        if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
          bio_write(bio, lenv, cblk->numlenbits + int_floorlog2(nump));
          lenv = 0;
          nump = 0;
        }
      }
    }
  }
  
  if (bio_flush(bio)) {
    return -999;    /* modified to eliminate longjmp !! */
  }
  
  c += bio_numbytes(bio);

  bio_destroy(bio);
  
  /* <EPH 0xff92> */
  if (tcp->csty & J2K_CP_CSTY_EPH) {
    eph = (unsigned char *) opj_malloc(2 * sizeof(unsigned char));
    eph[0] = 255;
    eph[1] = 146;
    memcpy(c, eph, 2);
    opj_free(eph);
    c += 2;
  }
  /* </EPH> */
  
  /* Writing the packet body */
  
  for (bandno = 0; bandno < res->numbands; bandno++) {
    opj_tcd_band_t *band = &res->bands[bandno];
    opj_tcd_precinct_t *prc = &band->precincts[precno];
    for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
      opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
      opj_tcd_layer_t *layer = &cblk->layers[layno];
      if (!layer->numpasses) {
        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(image_info && image_info->index_write && image_info->index_on) {
        opj_tile_info_t *info_TL = &image_info->tile[tileno];
        opj_packet_info_t *info_PK = &info_TL->packet[image_info->num];
        info_PK->disto += layer->disto;
        if (image_info->D_max < info_PK->disto) {
          image_info->D_max = info_PK->disto;
        }
      }
      /* </ADD> */
    }
  }
  
  return (int)(c - dest);
}

static void t2_init_seg(opj_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;
  }
}

static int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len, opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi) {
  int bandno, cblkno;
  unsigned char *c = src;

  opj_cp_t *cp = t2->cp;

  int compno = pi->compno;  /* component value */
  int resno  = pi->resno;    /* resolution level value */
  int precno = pi->precno;  /* precinct value */
  int layno  = pi->layno;    /* quality layer value */

  opj_tcd_tilecomp_t *tilec = &tile->comps[compno];
  opj_tcd_resolution_t *res = &tilec->resolutions[resno];
  
  unsigned char *hd = NULL;
  int present;
  
  opj_bio_t *bio = NULL;  /* BIO component */
  
  if (layno == 0) {
    for (bandno = 0; bandno < res->numbands; bandno++) {
      opj_tcd_band_t *band = &res->bands[bandno];
      opj_tcd_precinct_t *prc = &band->precincts[precno];
      
      if ((band->x1-band->x0 == 0)||(band->y1-band->y0 == 0)) continue;
      
      tgt_reset(prc->incltree);
      tgt_reset(prc->imsbtree);
      for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
        opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
        cblk->numsegs = 0;
      }
    }
  }
  
  /* SOP markers */
  
  if (tcp->csty & J2K_CP_CSTY_SOP) {
    if ((*c) != 0xff || (*(c + 1) != 0x91)) {
      opj_event_msg(t2->cinfo, EVT_WARNING, "Expected SOP marker\n");
    } else {
      c += 6;
    }
    
    /** TODO : check the Nsop value */
  }
  
  /* 
  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: Return to codestream for decoding 
  */

  bio = bio_create();
  
  if (cp->ppm == 1) {    /* PPM */
    hd = cp->ppm_data;
    bio_init_dec(bio, hd, cp->ppm_len);
  } else if (tcp->ppt == 1) {  /* PPT */
    hd = tcp->ppt_data;
    bio_init_dec(bio, hd, tcp->ppt_len);
  } else {      /* Normal Case */
    hd = c;
    bio_init_dec(bio, hd, (int)(src+len-hd));
  }
  
  present = bio_read(bio, 1);
  
  if (!present) {
    bio_inalign(bio);
    hd += bio_numbytes(bio);
    bio_destroy(bio);
    
    /* EPH markers */
    
    if (tcp->csty & J2K_CP_CSTY_EPH) {
      if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
        printf("Error : expected EPH marker\n");
      } else {
        hd += 2;
      }
    }
    
    if (cp->ppm == 1) {    /* PPM case */
      cp->ppm_len += (int)(cp->ppm_data-hd);
      cp->ppm_data = hd;
      return (int)(c - src);
    }
    if (tcp->ppt == 1) {  /* PPT case */
      tcp->ppt_len += (int)(tcp->ppt_data-hd);
      tcp->ppt_data = hd;
      return (int)(c - src);
    }
    
    return (int)(hd - src);
  }
  
  for (bandno = 0; bandno < res->numbands; bandno++) {
    opj_tcd_band_t *band = &res->bands[bandno];
    opj_tcd_precinct_t *prc = &band->precincts[precno];
    
    if ((band->x1-band->x0 == 0)||(band->y1-band->y0 == 0)) continue;
    
    for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
      int included, increment, n;
      opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
      opj_tcd_seg_t *seg = NULL;
      /* if cblk not yet included before --> inclusion tagtree */
      if (!cblk->numsegs) {
        included = tgt_decode(bio, prc->incltree, cblkno, layno + 1);
        /* else one bit */
      } else {
        included = bio_read(bio, 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(bio, prc->imsbtree, cblkno, i); i++) {
          ;
        }
        numimsbs = i - 1;
        cblk->numbps = band->numbps - numimsbs;
        cblk->numlenbits = 3;
      }
      /* number of coding passes */
      cblk->numnewpasses = t2_getnumpasses(bio);
      increment = t2_getcommacode(bio);
      /* 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(bio, 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(bio)) {
    bio_destroy(bio);
    return -999;
  }
  
  hd += bio_numbytes(bio);
  bio_destroy(bio);
  
  /* EPH markers */
  if (tcp->csty & J2K_CP_CSTY_EPH) {
    if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
      opj_event_msg(t2->cinfo, EVT_ERROR, "Expected EPH marker\n");
    } else {
      hd += 2;
    }
  }
  
  if (cp->ppm==1) {
    cp->ppm_len += (int)(cp->ppm_data-hd);
    cp->ppm_data = hd;
  } else if (tcp->ppt == 1) {
    tcp->ppt_len += (int)(tcp->ppt_data-hd);
    tcp->ppt_data = hd;
  } else {
    c=hd;
  }
  
  for (bandno = 0; bandno < res->numbands; bandno++) {
    opj_tcd_band_t *band = &res->bands[bandno];
    opj_tcd_precinct_t *prc = &band->precincts[precno];
    
    if ((band->x1-band->x0 == 0)||(band->y1-band->y0 == 0)) continue;
    
    for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
      opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
      opj_tcd_seg_t *seg = NULL;
      if (!cblk->numnewpasses)
        continue;
      if (!cblk->numsegs) {
        seg = &cblk->segs[0];
        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 (int)(c - src);
}

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

int t2_encode_packets(opj_t2_t* t2, int tileno, opj_tcd_tile_t *tile, int maxlayers, unsigned char *dest, int len, opj_image_info_t *image_info) {
  unsigned char *c = dest;
  int e = 0;
  opj_pi_iterator_t *pi = NULL;
  int pino;

  opj_image_t *image = t2->image;
  opj_cp_t *cp = t2->cp;
  
  /* create a packet iterator */
  pi = pi_create(image, cp, tileno);
  if(!pi) {
    /* TODO: throw an error */
    return -999;
  }
  
  if(image_info) {
    image_info->num = 0;
  }
  
  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], c, (int)(dest + len - c), image_info, tileno);
        if (e == -999) {
          break;
        } else {
          c += e;
        }
        
        /* INDEX >> */
        if(image_info && image_info->index_on) {
          if(image_info->index_write) {
            opj_tile_info_t *info_TL = &image_info->tile[tileno];
            opj_packet_info_t *info_PK = &info_TL->packet[image_info->num];
            if (!image_info->num) {
              info_PK->start_pos = info_TL->end_header + 1;
            } else {
              info_PK->start_pos = info_TL->packet[image_info->num - 1].end_pos + 1;
            }
            info_PK->end_pos = info_PK->start_pos + e - 1;
          }

          image_info->num++;
        }
        /* << INDEX */
      }
    }
  }

  /* don't forget to release pi */
  pi_destroy(pi, cp, tileno);
  
  if (e == -999) {
    return e;
  }

    return (int)(c - dest);
}

int t2_decode_packets(opj_t2_t *t2, unsigned char *src, int len, int tileno, opj_tcd_tile_t *tile) {
  unsigned char *c = src;
  opj_pi_iterator_t *pi;
  int pino, e = 0;
  int n = 0;

  opj_image_t *image = t2->image;
  opj_cp_t *cp = t2->cp;
  
  /* create a packet iterator */
  pi = pi_create(image, cp, tileno);
  if(!pi) {
    /* TODO: throw an error */
    return -999;
  }
  
  for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
    while (pi_next(&pi[pino])) {
      if ((cp->layer==0) || (cp->layer>=((pi[pino].layno)+1))) {
        e = t2_decode_packet(t2, c, (int)(src + len - c), tile, &cp->tcps[tileno], &pi[pino]);
      } else {
        e = 0;
      }
      
      /* progression in resolution */
      image->comps[pi[pino].compno].resno_decoded =  
        (e > 0) ? 
        int_max(pi[pino].resno, image->comps[pi[pino].compno].resno_decoded) 
        : image->comps[pi[pino].compno].resno_decoded;
      n++;
      
      if (e == -999) {    /* ADD */
        break;
      } else {
        c += e;
      }
    }
  }

  /* don't forget to release pi */
  pi_destroy(pi, cp, tileno);
  
  if (e == -999) {
    return e;
  }
  
    return (int)(c - src);
}

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

opj_t2_t* t2_create(opj_common_ptr cinfo, opj_image_t *image, opj_cp_t *cp) {
  /* create the tcd structure */
  opj_t2_t *t2 = (opj_t2_t*)opj_malloc(sizeof(opj_t2_t));
  if(!t2) return NULL;
  t2->cinfo = cinfo;
  t2->image = image;
  t2->cp = cp;

  return t2;
}

void t2_destroy(opj_t2_t *t2) {
  if(t2) {
    opj_free(t2);
  }
}