src/lib/openmj2/t2.c

   1 /*
   2  * The copyright in this software is being made available under the 2-clauses
   3  * BSD License, included below. This software may be subject to other third
   4  * party and contributor rights, including patent rights, and no such rights
   5  * are granted under this license.
   6  *
   7  * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
   8  * Copyright (c) 2002-2014, Professor Benoit Macq
   9  * Copyright (c) 2001-2003, David Janssens
  10  * Copyright (c) 2002-2003, Yannick Verschueren
  11  * Copyright (c) 2003-2007, Francois-Olivier Devaux
  12  * Copyright (c) 2003-2014, Antonin Descampe
  13  * Copyright (c) 2005, Herve Drolon, FreeImage Team
  14  * All rights reserved.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  26  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "opj_includes.h"
  39
  40 /** @defgroup T2 T2 - Implementation of a tier-2 coding */
  41 /*@{*/
  42
  43 /** @name Local static functions */
  44 /*@{*/
  45
  46 static void t2_putcommacode(opj_bio_t *bio, int n);
  47 static int t2_getcommacode(opj_bio_t *bio);
  48 /**
  49 Variable length code for signalling delta Zil (truncation point)
  50 @param bio Bit Input/Output component
  51 @param n delta Zil
  52 */
  53 static void t2_putnumpasses(opj_bio_t *bio, int n);
  54 static int t2_getnumpasses(opj_bio_t *bio);
  55 /**
  56 Encode a packet of a tile to a destination buffer
  57 @param tile Tile for which to write the packets
  58 @param tcp Tile coding parameters
  59 @param pi Packet identity
  60 @param dest Destination buffer
  61 @param len Length of the destination buffer
  62 @param cstr_info Codestream information structure
  63 @param tileno Number of the tile encoded
  64 @return
  65 */
  66 static int t2_encode_packet(opj_tcd_tile_t *tile, opj_tcp_t *tcp,
  67                             opj_pi_iterator_t *pi, unsigned char *dest, int len,
  68                             opj_codestream_info_t *cstr_info, int tileno);
  69 /**
  70 @param cblk
  71 @param index
  72 @param cblksty
  73 @param first
  74 */
  75 static opj_bool t2_init_seg(opj_tcd_cblk_dec_t* cblk, int index, int cblksty,
  76                             int first);
  77 /**
  78 Decode a packet of a tile from a source buffer
  79 @param t2 T2 handle
  80 @param src Source buffer
  81 @param len Length of the source buffer
  82 @param tile Tile for which to write the packets
  83 @param tcp Tile coding parameters
  84 @param pi Packet identity
  85 @param pack_info Packet information
  86 @return
  87 */
  88 static int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len,
  89                             opj_tcd_tile_t *tile,
  90                             opj_tcp_t *tcp, opj_pi_iterator_t *pi, opj_packet_info_t *pack_info);
  91
  92 /*@}*/
  93
  94 /*@}*/
  95
  96 /* ----------------------------------------------------------------------- */
  97
  98 /* #define RESTART 0x04 */
  99
 100 static void t2_putcommacode(opj_bio_t *bio, int n)
 101 {
 102     while (--n >= 0) {
 103         bio_write(bio, 1, 1);
 104     }
 105     bio_write(bio, 0, 1);
 106 }
 107
 108 static int t2_getcommacode(opj_bio_t *bio)
 109 {
 110     int n;
 111     for (n = 0; bio_read(bio, 1); n++) {
 112         ;
 113     }
 114     return n;
 115 }
 116
 117 static void t2_putnumpasses(opj_bio_t *bio, int n)
 118 {
 119     if (n == 1) {
 120         bio_write(bio, 0, 1);
 121     } else if (n == 2) {
 122         bio_write(bio, 2, 2);
 123     } else if (n <= 5) {
 124         bio_write(bio, 0xc | (n - 3), 4);
 125     } else if (n <= 36) {
 126         bio_write(bio, 0x1e0 | (n - 6), 9);
 127     } else if (n <= 164) {
 128         bio_write(bio, 0xff80 | (n - 37), 16);
 129     }
 130 }
 131
 132 static int t2_getnumpasses(opj_bio_t *bio)
 133 {
 134     int n;
 135     if (!bio_read(bio, 1)) {
 136         return 1;
 137     }
 138     if (!bio_read(bio, 1)) {
 139         return 2;
 140     }
 141     if ((n = bio_read(bio, 2)) != 3) {
 142         return (3 + n);
 143     }
 144     if ((n = bio_read(bio, 5)) != 31) {
 145         return (6 + n);
 146     }
 147     return (37 + bio_read(bio, 7));
 148 }
 149
 150 static int t2_encode_packet(opj_tcd_tile_t * tile, opj_tcp_t * tcp,
 151                             opj_pi_iterator_t *pi, unsigned char *dest, int length,
 152                             opj_codestream_info_t *cstr_info, int tileno)
 153 {
 154     int bandno, cblkno;
 155     unsigned char *c = dest;
 156
 157     int compno = pi->compno;    /* component value */
 158     int resno  = pi->resno;     /* resolution level value */
 159     int precno = pi->precno;    /* precinct value */
 160     int layno  = pi->layno;     /* quality layer value */
 161
 162     opj_tcd_tilecomp_t *tilec = &tile->comps[compno];
 163     opj_tcd_resolution_t *res = &tilec->resolutions[resno];
 164
 165     opj_bio_t *bio = NULL;  /* BIO component */
 166
 167     /* <SOP 0xff91> */
 168     if (tcp->csty & J2K_CP_CSTY_SOP) {
 169         c[0] = 255;
 170         c[1] = 145;
 171         c[2] = 0;
 172         c[3] = 4;
 173         c[4] = (unsigned char)((tile->packno % 65536) / 256);
 174         c[5] = (unsigned char)((tile->packno % 65536) % 256);
 175         c += 6;
 176     }
 177     /* </SOP> */
 178
 179     if (!layno) {
 180         for (bandno = 0; bandno < res->numbands; bandno++) {
 181             opj_tcd_band_t *band = &res->bands[bandno];
 182             opj_tcd_precinct_t *prc = &band->precincts[precno];
 183             tgt_reset(prc->incltree);
 184             tgt_reset(prc->imsbtree);
 185             for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 186                 opj_tcd_cblk_enc_t* cblk = &prc->cblks.enc[cblkno];
 187                 cblk->numpasses = 0;
 188                 tgt_setvalue(prc->imsbtree, cblkno, band->numbps - cblk->numbps);
 189             }
 190         }
 191     }
 192
 193     bio = bio_create();
 194     bio_init_enc(bio, c, length);
 195     bio_write(bio, 1, 1);       /* Empty header bit */
 196
 197     /* Writing Packet header */
 198     for (bandno = 0; bandno < res->numbands; bandno++) {
 199         opj_tcd_band_t *band = &res->bands[bandno];
 200         opj_tcd_precinct_t *prc = &band->precincts[precno];
 201         for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 202             opj_tcd_cblk_enc_t* cblk = &prc->cblks.enc[cblkno];
 203             opj_tcd_layer_t *layer = &cblk->layers[layno];
 204             if (!cblk->numpasses && layer->numpasses) {
 205                 tgt_setvalue(prc->incltree, cblkno, layno);
 206             }
 207         }
 208         for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 209             opj_tcd_cblk_enc_t* cblk = &prc->cblks.enc[cblkno];
 210             opj_tcd_layer_t *layer = &cblk->layers[layno];
 211             int increment = 0;
 212             int nump = 0;
 213             int len = 0, passno;
 214             /* cblk inclusion bits */
 215             if (!cblk->numpasses) {
 216                 tgt_encode(bio, prc->incltree, cblkno, layno + 1);
 217             } else {
 218                 bio_write(bio, layer->numpasses != 0, 1);
 219             }
 220             /* if cblk not included, go to the next cblk  */
 221             if (!layer->numpasses) {
 222                 continue;
 223             }
 224             /* if first instance of cblk --> zero bit-planes information */
 225             if (!cblk->numpasses) {
 226                 cblk->numlenbits = 3;
 227                 tgt_encode(bio, prc->imsbtree, cblkno, 999);
 228             }
 229             /* number of coding passes included */
 230             t2_putnumpasses(bio, layer->numpasses);
 231
 232             /* computation of the increase of the length indicator and insertion in the header     */
 233             for (passno = cblk->numpasses; passno < cblk->numpasses + layer->numpasses;
 234                     passno++) {
 235                 opj_tcd_pass_t *pass = &cblk->passes[passno];
 236                 nump++;
 237                 len += pass->len;
 238                 if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
 239                     increment = int_max(increment,
 240                                         int_floorlog2(len) + 1 - (cblk->numlenbits + int_floorlog2(nump)));
 241                     len = 0;
 242                     nump = 0;
 243                 }
 244             }
 245             t2_putcommacode(bio, increment);
 246
 247             /* computation of the new Length indicator */
 248             cblk->numlenbits += increment;
 249
 250             /* insertion of the codeword segment length */
 251             for (passno = cblk->numpasses; passno < cblk->numpasses + layer->numpasses;
 252                     passno++) {
 253                 opj_tcd_pass_t *pass = &cblk->passes[passno];
 254                 nump++;
 255                 len += pass->len;
 256                 if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
 257                     bio_write(bio, len, cblk->numlenbits + int_floorlog2(nump));
 258                     len = 0;
 259                     nump = 0;
 260                 }
 261             }
 262         }
 263     }
 264
 265     if (bio_flush(bio)) {
 266         bio_destroy(bio);
 267         return -999;        /* modified to eliminate longjmp !! */
 268     }
 269
 270     c += bio_numbytes(bio);
 271     bio_destroy(bio);
 272
 273     /* <EPH 0xff92> */
 274     if (tcp->csty & J2K_CP_CSTY_EPH) {
 275         c[0] = 255;
 276         c[1] = 146;
 277         c += 2;
 278     }
 279     /* </EPH> */
 280
 281     /* << INDEX */
 282     /* End of packet header position. Currently only represents the distance to start of packet
 283     // Will be updated later by incrementing with packet start value */
 284     if (cstr_info && cstr_info->index_write) {
 285         opj_packet_info_t *info_PK = &cstr_info->tile[tileno].packet[cstr_info->packno];
 286         info_PK->end_ph_pos = (int)(c - dest);
 287     }
 288     /* INDEX >> */
 289
 290     /* Writing the packet body */
 291
 292     for (bandno = 0; bandno < res->numbands; bandno++) {
 293         opj_tcd_band_t *band = &res->bands[bandno];
 294         opj_tcd_precinct_t *prc = &band->precincts[precno];
 295         for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 296             opj_tcd_cblk_enc_t* cblk = &prc->cblks.enc[cblkno];
 297             opj_tcd_layer_t *layer = &cblk->layers[layno];
 298             if (!layer->numpasses) {
 299                 continue;
 300             }
 301             if (c + layer->len > dest + length) {
 302                 return -999;
 303             }
 304
 305             memcpy(c, layer->data, layer->len);
 306             cblk->numpasses += layer->numpasses;
 307             c += layer->len;
 308             /* << INDEX */
 309             if (cstr_info && cstr_info->index_write) {
 310                 opj_packet_info_t *info_PK = &cstr_info->tile[tileno].packet[cstr_info->packno];
 311                 info_PK->disto += layer->disto;
 312                 if (cstr_info->D_max < info_PK->disto) {
 313                     cstr_info->D_max = info_PK->disto;
 314                 }
 315             }
 316             /* INDEX >> */
 317         }
 318     }
 319
 320     return (c - dest);
 321 }
 322
 323 static opj_bool t2_init_seg(opj_tcd_cblk_dec_t* cblk, int index, int cblksty,
 324                             int first)
 325 {
 326     opj_tcd_seg_t* seg;
 327     opj_tcd_seg_t* segs;
 328     segs = (opj_tcd_seg_t*) opj_realloc(cblk->segs,
 329                                         (index + 1) * sizeof(opj_tcd_seg_t));
 330
 331     if (segs == NULL) {
 332         return OPJ_FALSE;
 333     }
 334     cblk->segs = segs;
 335
 336     seg = &cblk->segs[index];
 337     seg->data = NULL;
 338     seg->dataindex = 0;
 339     seg->numpasses = 0;
 340     seg->len = 0;
 341     if (cblksty & J2K_CCP_CBLKSTY_TERMALL) {
 342         seg->maxpasses = 1;
 343     } else if (cblksty & J2K_CCP_CBLKSTY_LAZY) {
 344         if (first) {
 345             seg->maxpasses = 10;
 346         } else {
 347             seg->maxpasses = (((seg - 1)->maxpasses == 1) ||
 348                               ((seg - 1)->maxpasses == 10)) ? 2 : 1;
 349         }
 350     } else {
 351         seg->maxpasses = 109;
 352     }
 353
 354     return OPJ_TRUE;
 355 }
 356
 357 static int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len,
 358                             opj_tcd_tile_t *tile,
 359                             opj_tcp_t *tcp, opj_pi_iterator_t *pi, opj_packet_info_t *pack_info)
 360 {
 361     int bandno, cblkno;
 362     unsigned char *c = src;
 363
 364     opj_cp_t *cp = t2->cp;
 365
 366     int compno = pi->compno;    /* component value */
 367     int resno  = pi->resno;     /* resolution level value */
 368     int precno = pi->precno;    /* precinct value */
 369     int layno  = pi->layno;     /* quality layer value */
 370
 371     opj_tcd_resolution_t* res = &tile->comps[compno].resolutions[resno];
 372
 373     unsigned char *hd = NULL;
 374     int present;
 375
 376     opj_bio_t *bio = NULL;  /* BIO component */
 377
 378     if (layno == 0) {
 379         for (bandno = 0; bandno < res->numbands; bandno++) {
 380             opj_tcd_band_t *band = &res->bands[bandno];
 381             opj_tcd_precinct_t *prc = &band->precincts[precno];
 382
 383             if ((band->x1 - band->x0 == 0) || (band->y1 - band->y0 == 0)) {
 384                 continue;
 385             }
 386
 387             tgt_reset(prc->incltree);
 388             tgt_reset(prc->imsbtree);
 389             for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 390                 opj_tcd_cblk_dec_t* cblk = &prc->cblks.dec[cblkno];
 391                 cblk->numsegs = 0;
 392             }
 393         }
 394     }
 395
 396     /* SOP markers */
 397
 398     if (tcp->csty & J2K_CP_CSTY_SOP) {
 399         if ((*c) != 0xff || (*(c + 1) != 0x91)) {
 400             opj_event_msg(t2->cinfo, EVT_WARNING, "Expected SOP marker\n");
 401         } else {
 402             c += 6;
 403         }
 404
 405         /** TODO : check the Nsop value */
 406     }
 407
 408     /*
 409     When the marker PPT/PPM is used the packet header are store in PPT/PPM marker
 410     This part deal with this caracteristic
 411     step 1: Read packet header in the saved structure
 412     step 2: Return to codestream for decoding
 413     */
 414
 415     bio = bio_create();
 416
 417     if (cp->ppm == 1) {     /* PPM */
 418         hd = cp->ppm_data;
 419         bio_init_dec(bio, hd, cp->ppm_len);
 420     } else if (tcp->ppt == 1) { /* PPT */
 421         hd = tcp->ppt_data;
 422         bio_init_dec(bio, hd, tcp->ppt_len);
 423     } else {            /* Normal Case */
 424         hd = c;
 425         bio_init_dec(bio, hd, src + len - hd);
 426     }
 427
 428     present = bio_read(bio, 1);
 429
 430     if (!present) {
 431         bio_inalign(bio);
 432         hd += bio_numbytes(bio);
 433         bio_destroy(bio);
 434
 435         /* EPH markers */
 436
 437         if (tcp->csty & J2K_CP_CSTY_EPH) {
 438             if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
 439                 printf("Error : expected EPH marker\n");
 440             } else {
 441                 hd += 2;
 442             }
 443         }
 444
 445         /* << INDEX */
 446         /* End of packet header position. Currently only represents the distance to start of packet
 447         // Will be updated later by incrementing with packet start value*/
 448         if (pack_info) {
 449             pack_info->end_ph_pos = (int)(c - src);
 450         }
 451         /* INDEX >> */
 452
 453         if (cp->ppm == 1) {     /* PPM case */
 454             cp->ppm_len += cp->ppm_data - hd;
 455             cp->ppm_data = hd;
 456             return (c - src);
 457         }
 458         if (tcp->ppt == 1) {    /* PPT case */
 459             tcp->ppt_len += tcp->ppt_data - hd;
 460             tcp->ppt_data = hd;
 461             return (c - src);
 462         }
 463
 464         return (hd - src);
 465     }
 466
 467     for (bandno = 0; bandno < res->numbands; bandno++) {
 468         opj_tcd_band_t *band = &res->bands[bandno];
 469         opj_tcd_precinct_t *prc = &band->precincts[precno];
 470
 471         if ((band->x1 - band->x0 == 0) || (band->y1 - band->y0 == 0)) {
 472             continue;
 473         }
 474
 475         for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 476             int included, increment, n, segno;
 477             opj_tcd_cblk_dec_t* cblk = &prc->cblks.dec[cblkno];
 478             /* if cblk not yet included before --> inclusion tagtree */
 479             if (!cblk->numsegs) {
 480                 included = tgt_decode(bio, prc->incltree, cblkno, layno + 1);
 481                 /* else one bit */
 482             } else {
 483                 included = bio_read(bio, 1);
 484             }
 485             /* if cblk not included */
 486             if (!included) {
 487                 cblk->numnewpasses = 0;
 488                 continue;
 489             }
 490             /* if cblk not yet included --> zero-bitplane tagtree */
 491             if (!cblk->numsegs) {
 492                 int i, numimsbs;
 493                 for (i = 0; !tgt_decode(bio, prc->imsbtree, cblkno, i); i++) {
 494                     ;
 495                 }
 496                 numimsbs = i - 1;
 497                 cblk->numbps = band->numbps - numimsbs;
 498                 cblk->numlenbits = 3;
 499             }
 500             /* number of coding passes */
 501             cblk->numnewpasses = t2_getnumpasses(bio);
 502             increment = t2_getcommacode(bio);
 503             /* length indicator increment */
 504             cblk->numlenbits += increment;
 505             segno = 0;
 506             if (!cblk->numsegs) {
 507                 if (!t2_init_seg(cblk, segno, tcp->tccps[compno].cblksty, 1)) {
 508                     opj_event_msg(t2->cinfo, EVT_ERROR, "Out of memory\n");
 509                     bio_destroy(bio);
 510                     return -999;
 511                 }
 512             } else {
 513                 segno = cblk->numsegs - 1;
 514                 if (cblk->segs[segno].numpasses == cblk->segs[segno].maxpasses) {
 515                     ++segno;
 516                     if (!t2_init_seg(cblk, segno, tcp->tccps[compno].cblksty, 0)) {
 517                         opj_event_msg(t2->cinfo, EVT_ERROR, "Out of memory\n");
 518                         bio_destroy(bio);
 519                         return -999;
 520                     }
 521                 }
 522             }
 523             n = cblk->numnewpasses;
 524
 525             do {
 526                 cblk->segs[segno].numnewpasses = int_min(cblk->segs[segno].maxpasses -
 527                                                  cblk->segs[segno].numpasses, n);
 528                 cblk->segs[segno].newlen = bio_read(bio,
 529                                                     cblk->numlenbits + int_floorlog2(cblk->segs[segno].numnewpasses));
 530                 n -= cblk->segs[segno].numnewpasses;
 531                 if (n > 0) {
 532                     ++segno;
 533                     if (!t2_init_seg(cblk, segno, tcp->tccps[compno].cblksty, 0)) {
 534                         opj_event_msg(t2->cinfo, EVT_ERROR, "Out of memory\n");
 535                         bio_destroy(bio);
 536                         return -999;
 537                     }
 538                 }
 539             } while (n > 0);
 540         }
 541     }
 542
 543     if (bio_inalign(bio)) {
 544         bio_destroy(bio);
 545         return -999;
 546     }
 547
 548     hd += bio_numbytes(bio);
 549     bio_destroy(bio);
 550
 551     /* EPH markers */
 552     if (tcp->csty & J2K_CP_CSTY_EPH) {
 553         if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
 554             opj_event_msg(t2->cinfo, EVT_ERROR, "Expected EPH marker\n");
 555             return -999;
 556         } else {
 557             hd += 2;
 558         }
 559     }
 560
 561     /* << INDEX */
 562     /* End of packet header position. Currently only represents the distance to start of packet
 563     // Will be updated later by incrementing with packet start value*/
 564     if (pack_info) {
 565         pack_info->end_ph_pos = (int)(hd - src);
 566     }
 567     /* INDEX >> */
 568
 569     if (cp->ppm == 1) {
 570         cp->ppm_len += cp->ppm_data - hd;
 571         cp->ppm_data = hd;
 572     } else if (tcp->ppt == 1) {
 573         tcp->ppt_len += tcp->ppt_data - hd;
 574         tcp->ppt_data = hd;
 575     } else {
 576         c = hd;
 577     }
 578
 579     for (bandno = 0; bandno < res->numbands; bandno++) {
 580         opj_tcd_band_t *band = &res->bands[bandno];
 581         opj_tcd_precinct_t *prc = &band->precincts[precno];
 582
 583         if ((band->x1 - band->x0 == 0) || (band->y1 - band->y0 == 0)) {
 584             continue;
 585         }
 586
 587         for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
 588             opj_tcd_cblk_dec_t* cblk = &prc->cblks.dec[cblkno];
 589             opj_tcd_seg_t *seg = NULL;
 590             if (!cblk->numnewpasses) {
 591                 continue;
 592             }
 593             if (!cblk->numsegs) {
 594                 seg = &cblk->segs[0];
 595                 cblk->numsegs++;
 596                 cblk->len = 0;
 597             } else {
 598                 seg = &cblk->segs[cblk->numsegs - 1];
 599                 if (seg->numpasses == seg->maxpasses) {
 600                     seg++;
 601                     cblk->numsegs++;
 602                 }
 603             }
 604
 605             do {
 606                 if (c + seg->newlen > src + len) {
 607                     return -999;
 608                 }
 609
 610 #ifdef USE_JPWL
 611                 /* we need here a j2k handle to verify if making a check to
 612                 the validity of cblocks parameters is selected from user (-W) */
 613
 614                 /* let's check that we are not exceeding */
 615                 if ((cblk->len + seg->newlen) > 8192) {
 616                     opj_event_msg(t2->cinfo, EVT_WARNING,
 617                                   "JPWL: segment too long (%d) for codeblock %d (p=%d, b=%d, r=%d, c=%d)\n",
 618                                   seg->newlen, cblkno, precno, bandno, resno, compno);
 619                     if (!JPWL_ASSUME) {
 620                         opj_event_msg(t2->cinfo, EVT_ERROR, "JPWL: giving up\n");
 621                         return -999;
 622                     }
 623                     seg->newlen = 8192 - cblk->len;
 624                     opj_event_msg(t2->cinfo, EVT_WARNING, "      - truncating segment to %d\n",
 625                                   seg->newlen);
 626                     break;
 627                 };
 628
 629 #endif /* USE_JPWL */
 630
 631                 cblk->data = (unsigned char*) opj_realloc(cblk->data,
 632                              (cblk->len + seg->newlen) * sizeof(unsigned char));
 633                 memcpy(cblk->data + cblk->len, c, seg->newlen);
 634                 if (seg->numpasses == 0) {
 635                     seg->data = &cblk->data;
 636                     seg->dataindex = cblk->len;
 637                 }
 638                 c += seg->newlen;
 639                 cblk->len += seg->newlen;
 640                 seg->len += seg->newlen;
 641                 seg->numpasses += seg->numnewpasses;
 642                 cblk->numnewpasses -= seg->numnewpasses;
 643                 if (cblk->numnewpasses > 0) {
 644                     seg++;
 645                     cblk->numsegs++;
 646                 }
 647             } while (cblk->numnewpasses > 0);
 648         }
 649     }
 650
 651     return (c - src);
 652 }
 653
 654 /* ----------------------------------------------------------------------- */
 655
 656 int t2_encode_packets(opj_t2_t* t2, int tileno, opj_tcd_tile_t *tile,
 657                       int maxlayers, unsigned char *dest, int len, opj_codestream_info_t *cstr_info,
 658                       int tpnum, int tppos, int pino, J2K_T2_MODE t2_mode, int cur_totnum_tp)
 659 {
 660     unsigned char *c = dest;
 661     int e = 0;
 662     int compno;
 663     opj_pi_iterator_t *pi = NULL;
 664     int poc;
 665     opj_image_t *image = t2->image;
 666     opj_cp_t *cp = t2->cp;
 667     opj_tcp_t *tcp = &cp->tcps[tileno];
 668     int pocno = cp->cinema == CINEMA4K_24 ? 2 : 1;
 669     int maxcomp = cp->max_comp_size > 0 ? image->numcomps : 1;
 670
 671     pi = pi_initialise_encode(image, cp, tileno, t2_mode);
 672     if (!pi) {
 673         /* TODO: throw an error */
 674         return -999;
 675     }
 676
 677     if (t2_mode == THRESH_CALC) { /* Calculating threshold */
 678         for (compno = 0; compno < maxcomp; compno++) {
 679             for (poc = 0; poc < pocno ; poc++) {
 680                 int comp_len = 0;
 681                 int tpnum = compno;
 682                 if (pi_create_encode(pi, cp, tileno, poc, tpnum, tppos, t2_mode,
 683                                      cur_totnum_tp)) {
 684                     opj_event_msg(t2->cinfo, EVT_ERROR, "Error initializing Packet Iterator\n");
 685                     pi_destroy(pi, cp, tileno);
 686                     return -999;
 687                 }
 688                 while (pi_next(&pi[poc])) {
 689                     if (pi[poc].layno < maxlayers) {
 690                         e = t2_encode_packet(tile, &cp->tcps[tileno], &pi[poc], c, dest + len - c,
 691                                              cstr_info, tileno);
 692                         comp_len = comp_len + e;
 693                         if (e == -999) {
 694                             break;
 695                         } else {
 696                             c += e;
 697                         }
 698                     }
 699                 }
 700                 if (e == -999) {
 701                     break;
 702                 }
 703                 if (cp->max_comp_size) {
 704                     if (comp_len > cp->max_comp_size) {
 705                         e = -999;
 706                         break;
 707                     }
 708                 }
 709             }
 710             if (e == -999) {
 711                 break;
 712             }
 713         }
 714     } else { /* t2_mode == FINAL_PASS  */
 715         pi_create_encode(pi, cp, tileno, pino, tpnum, tppos, t2_mode, cur_totnum_tp);
 716         while (pi_next(&pi[pino])) {
 717             if (pi[pino].layno < maxlayers) {
 718                 e = t2_encode_packet(tile, &cp->tcps[tileno], &pi[pino], c, dest + len - c,
 719                                      cstr_info, tileno);
 720                 if (e == -999) {
 721                     break;
 722                 } else {
 723                     c += e;
 724                 }
 725                 /* INDEX >> */
 726                 if (cstr_info) {
 727                     if (cstr_info->index_write) {
 728                         opj_tile_info_t *info_TL = &cstr_info->tile[tileno];
 729                         opj_packet_info_t *info_PK = &info_TL->packet[cstr_info->packno];
 730                         if (!cstr_info->packno) {
 731                             info_PK->start_pos = info_TL->end_header + 1;
 732                         } else {
 733                             info_PK->start_pos = ((cp->tp_on | tcp->POC) &&
 734                                                   info_PK->start_pos) ? info_PK->start_pos : info_TL->packet[cstr_info->packno -
 735                                                                             1].end_pos + 1;
 736                         }
 737                         info_PK->end_pos = info_PK->start_pos + e - 1;
 738                         info_PK->end_ph_pos += info_PK->start_pos -
 739                                                1;  /* End of packet header which now only represents the distance
 740                                                                                                                         // to start of packet is incremented by value of start of packet*/
 741                     }
 742
 743                     cstr_info->packno++;
 744                 }
 745                 /* << INDEX */
 746                 tile->packno++;
 747             }
 748         }
 749     }
 750
 751     pi_destroy(pi, cp, tileno);
 752
 753     if (e == -999) {
 754         return e;
 755     }
 756
 757     return (c - dest);
 758 }
 759
 760 int t2_decode_packets(opj_t2_t *t2, unsigned char *src, int len, int tileno,
 761                       opj_tcd_tile_t *tile, opj_codestream_info_t *cstr_info)
 762 {
 763     unsigned char *c = src;
 764     opj_pi_iterator_t *pi;
 765     int pino, e = 0;
 766     int n = 0, curtp = 0;
 767     int tp_start_packno;
 768
 769     opj_image_t *image = t2->image;
 770     opj_cp_t *cp = t2->cp;
 771
 772     /* create a packet iterator */
 773     pi = pi_create_decode(image, cp, tileno);
 774     if (!pi) {
 775         /* TODO: throw an error */
 776         return -999;
 777     }
 778
 779     tp_start_packno = 0;
 780
 781     for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
 782         while (pi_next(&pi[pino])) {
 783             if ((cp->layer == 0) || (cp->layer >= ((pi[pino].layno) + 1))) {
 784                 opj_packet_info_t *pack_info;
 785                 if (cstr_info) {
 786                     pack_info = &cstr_info->tile[tileno].packet[cstr_info->packno];
 787                 } else {
 788                     pack_info = NULL;
 789                 }
 790                 e = t2_decode_packet(t2, c, src + len - c, tile, &cp->tcps[tileno], &pi[pino],
 791                                      pack_info);
 792             } else {
 793                 e = 0;
 794             }
 795             if (e == -999) {
 796                 pi_destroy(pi, cp, tileno);
 797                 return -999;
 798             }
 799             /* progression in resolution */
 800             image->comps[pi[pino].compno].resno_decoded =
 801                 (e > 0) ?
 802                 int_max(pi[pino].resno, image->comps[pi[pino].compno].resno_decoded)
 803                 : image->comps[pi[pino].compno].resno_decoded;
 804             n++;
 805
 806             /* INDEX >> */
 807             if (cstr_info) {
 808                 opj_tile_info_t *info_TL = &cstr_info->tile[tileno];
 809                 opj_packet_info_t *info_PK = &info_TL->packet[cstr_info->packno];
 810                 if (!cstr_info->packno) {
 811                     info_PK->start_pos = info_TL->end_header + 1;
 812                 } else if (info_TL->packet[cstr_info->packno - 1].end_pos >=
 813                            (int)cstr_info->tile[tileno].tp[curtp].tp_end_pos) { /* New tile part*/
 814                     info_TL->tp[curtp].tp_numpacks = cstr_info->packno -
 815                                                      tp_start_packno; /* Number of packets in previous tile-part*/
 816                     info_TL->tp[curtp].tp_start_pack = tp_start_packno;
 817                     tp_start_packno = cstr_info->packno;
 818                     curtp++;
 819                     info_PK->start_pos = cstr_info->tile[tileno].tp[curtp].tp_end_header + 1;
 820                 } else {
 821                     info_PK->start_pos = (cp->tp_on &&
 822                                           info_PK->start_pos) ? info_PK->start_pos : info_TL->packet[cstr_info->packno -
 823                                                                     1].end_pos + 1;
 824                 }
 825                 info_PK->end_pos = info_PK->start_pos + e - 1;
 826                 info_PK->end_ph_pos += info_PK->start_pos -
 827                                        1;  /* End of packet header which now only represents the distance
 828                                                                                                                 // to start of packet is incremented by value of start of packet*/
 829                 cstr_info->packno++;
 830             }
 831             /* << INDEX */
 832
 833             if (e == -999) {        /* ADD */
 834                 break;
 835             } else {
 836                 c += e;
 837             }
 838         }
 839     }
 840     /* INDEX >> */
 841     if (cstr_info) {
 842         cstr_info->tile[tileno].tp[curtp].tp_numpacks = cstr_info->packno -
 843                 tp_start_packno; /* Number of packets in last tile-part*/
 844         cstr_info->tile[tileno].tp[curtp].tp_start_pack = tp_start_packno;
 845     }
 846     /* << INDEX */
 847
 848     /* don't forget to release pi */
 849     pi_destroy(pi, cp, tileno);
 850
 851     if (e == -999) {
 852         return e;
 853     }
 854
 855     return (c - src);
 856 }
 857
 858 /* ----------------------------------------------------------------------- */
 859
 860 opj_t2_t* t2_create(opj_common_ptr cinfo, opj_image_t *image, opj_cp_t *cp)
 861 {
 862     /* create the tcd structure */
 863     opj_t2_t *t2 = (opj_t2_t*)opj_malloc(sizeof(opj_t2_t));
 864     if (!t2) {
 865         return NULL;
 866     }
 867     t2->cinfo = cinfo;
 868     t2->image = image;
 869     t2->cp = cp;
 870
 871     return t2;
 872 }
 873
 874 void t2_destroy(opj_t2_t *t2)
 875 {
 876     if (t2) {
 877         opj_free(t2);
 878     }
 879 }
 880
 881
 882
 883
 884