/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 *
 * JasPer Software License
 *
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 *
 * GRANT:
 *
 * Permission is hereby granted, free of charge, to any person (the "User")
 * obtaining a copy of this software and associated documentation, to deal
 * in the JasPer Software without restriction, including without limitation
 * the right to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the JasPer Software (in source and binary forms),
 * and to permit persons to whom the JasPer Software is furnished to do so,
 * provided further that the License Conditions below are met.
 *
 * License Conditions
 * ******************
 *
 * A.  Redistributions of source code must retain the above copyright notice,
 * and this list of conditions, and the following disclaimer.
 *
 * B.  Redistributions in binary form must reproduce the above copyright
 * notice, and this list of conditions, and the following disclaimer in
 * the documentation and/or other materials provided with the distribution.
 *
 * C.  Neither the name of Image Power, Inc. nor any other contributor
 * (including, but not limited to, the University of British Columbia and
 * Michael David Adams) may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * D.  User agrees that it shall not commence any action against Image Power,
 * Inc., the University of British Columbia, Michael David Adams, or any
 * other contributors (collectively "Licensors") for infringement of any
 * intellectual property rights ("IPR") held by the User in respect of any
 * technology that User owns or has a right to license or sublicense and
 * which is an element required in order to claim compliance with ISO/IEC
 * 15444-1 (i.e., JPEG-2000 Part 1).  "IPR" means all intellectual property
 * rights worldwide arising under statutory or common law, and whether
 * or not perfected, including, without limitation, all (i) patents and
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 * mask work registrations; (iii) rights relating to the protection of
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 * to those set forth in subsections (i), (ii), or (iii) and any other
 * proprietary rights relating to intangible property (other than trademark,
 * trade dress, or service mark rights); and (v) divisions, continuations,
 * renewals, reissues and extensions of the foregoing (as and to the extent
 * applicable) now existing, hereafter filed, issued or acquired.
 *
 * E.  If User commences an infringement action against any Licensor(s) then
 * such Licensor(s) shall have the right to terminate User's license and
 * all sublicenses that have been granted hereunder by User to other parties.
 *
 * F.  This software is for use only in hardware or software products that
 * are compliant with ISO/IEC 15444-1 (i.e., JPEG-2000 Part 1).  No license
 * or right to this Software is granted for products that do not comply
 * with ISO/IEC 15444-1.  The JPEG-2000 Part 1 standard can be purchased
 * from the ISO.
 *
 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
 * NO USE OF THE JASPER SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 * THIS DISCLAIMER.  THE JASPER SOFTWARE IS PROVIDED BY THE LICENSORS AND
 * CONTRIBUTORS UNDER THIS LICENSE ON AN ``AS-IS'' BASIS, WITHOUT WARRANTY
 * OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
 * WARRANTIES THAT THE JASPER SOFTWARE IS FREE OF DEFECTS, IS MERCHANTABLE,
 * IS FIT FOR A PARTICULAR PURPOSE OR IS NON-INFRINGING.  THOSE INTENDING
 * TO USE THE JASPER SOFTWARE OR MODIFICATIONS THEREOF FOR USE IN HARDWARE
 * OR SOFTWARE PRODUCTS ARE ADVISED THAT THEIR USE MAY INFRINGE EXISTING
 * PATENTS, COPYRIGHTS, TRADEMARKS, OR OTHER INTELLECTUAL PROPERTY RIGHTS.
 * THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE JASPER SOFTWARE
 * IS WITH THE USER.  SHOULD ANY PART OF THE JASPER SOFTWARE PROVE DEFECTIVE
 * IN ANY RESPECT, THE USER (AND NOT THE INITIAL DEVELOPERS, THE UNIVERSITY
 * OF BRITISH COLUMBIA, IMAGE POWER, INC., MICHAEL DAVID ADAMS, OR ANY
 * OTHER CONTRIBUTOR) SHALL ASSUME THE COST OF ANY NECESSARY SERVICING,
 * REPAIR OR CORRECTION.  UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY,
 * WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL THE
 * INITIAL DEVELOPER, THE UNIVERSITY OF BRITISH COLUMBIA, IMAGE POWER, INC.,
 * MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
 * JASPER SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO
 * THE USER OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
 * CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION,
 * DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR
 * MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF
 * SUCH PARTY HAD BEEN INFORMED, OR OUGHT TO HAVE KNOWN, OF THE POSSIBILITY
 * OF SUCH DAMAGES.  THE JASPER SOFTWARE AND UNDERLYING TECHNOLOGY ARE NOT
 * FAULT-TOLERANT AND ARE NOT DESIGNED, MANUFACTURED OR INTENDED FOR USE OR
 * RESALE AS ON-LINE CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING
 * FAIL-SAFE PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES,
 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT
 * LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
 * JASPER SOFTWARE OR UNDERLYING TECHNOLOGY OR PRODUCT COULD LEAD DIRECTLY
 * TO DEATH, PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE
 * ("HIGH RISK ACTIVITIES").  LICENSOR SPECIFICALLY DISCLAIMS ANY EXPRESS
 * OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.  USER WILL NOT
 * KNOWINGLY USE, DISTRIBUTE OR RESELL THE JASPER SOFTWARE OR UNDERLYING
 * TECHNOLOGY OR PRODUCTS FOR HIGH RISK ACTIVITIES AND WILL ENSURE THAT ITS
 * CUSTOMERS AND END-USERS OF ITS PRODUCTS ARE PROVIDED WITH A COPY OF THE
 * NOTICE SPECIFIED IN THIS SECTION.
 *
 * __END_OF_JASPER_LICENSE__
 */

/*
 * Tier 2 Encoder
 *
 * $Id$
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "jasper/jas_malloc.h"
#include "jasper/jas_math.h"
#include "jasper/jas_debug.h"

#include "jpc_flt.h"
#include "jpc_t2enc.h"
#include "jpc_t2cod.h"
#include "jpc_tagtree.h"
#include "jpc_enc.h"
#include "jpc_math.h"

/******************************************************************************\
* Code.
\******************************************************************************/

static int jpc_putcommacode(jpc_bitstream_t *out, int n)
{
        assert(n >= 0);

        while (--n >= 0) {
                if (jpc_bitstream_putbit(out, 1) == EOF) {
                        return -1;
                }
        }
        if (jpc_bitstream_putbit(out, 0) == EOF) {
                return -1;
        }
        return 0;
}

static int jpc_putnumnewpasses(jpc_bitstream_t *out, int n)
{
        int ret;

        if (n <= 0) {
                return -1;
        } else if (n == 1) {
                ret = jpc_bitstream_putbit(out, 0);
        } else if (n == 2) {
                ret = jpc_bitstream_putbits(out, 2, 2);
        } else if (n <= 5) {
                ret = jpc_bitstream_putbits(out, 4, 0xc | (n - 3));
        } else if (n <= 36) {
                ret = jpc_bitstream_putbits(out, 9, 0x1e0 | (n - 6));
        } else if (n <= 164) {
                ret = jpc_bitstream_putbits(out, 16, 0xff80 | (n - 37));
        } else {
                /* The standard has no provision for encoding a larger value.
                In practice, however, it is highly unlikely that this
                limitation will ever be encountered. */
                return -1;
        }

        return (ret != EOF) ? 0 : (-1);
}

int jpc_enc_encpkts(jpc_enc_t *enc, jas_stream_t *out)
{
        jpc_enc_tile_t *tile;
        jpc_pi_t *pi;

        tile = enc->curtile;

        jpc_init_t2state(enc, 0);
        pi = tile->pi;
        jpc_pi_init(pi);

        if (!jpc_pi_next(pi)) {
                for (;;) {
                        if (jpc_enc_encpkt(enc, out, jpc_pi_cmptno(pi), jpc_pi_rlvlno(pi),
                          jpc_pi_prcno(pi), jpc_pi_lyrno(pi))) {
                                return -1;
                        }
                        if (jpc_pi_next(pi)) {
                                break;
                        }
                }
        }
       
        return 0;
}

int jpc_enc_encpkt(jpc_enc_t *enc, jas_stream_t *out, int compno, int lvlno, int prcno, int lyrno)
{
        jpc_enc_tcmpt_t *comp;
        jpc_enc_rlvl_t *lvl;
        jpc_enc_band_t *band;
        jpc_enc_band_t *endbands;
        jpc_enc_cblk_t *cblk;
        jpc_enc_cblk_t *endcblks;
        jpc_bitstream_t *outb;
        jpc_enc_pass_t *pass;
        jpc_enc_pass_t *startpass;
        jpc_enc_pass_t *lastpass;
        jpc_enc_pass_t *endpass;
        jpc_enc_pass_t *endpasses;
        int i;
        int included;
        int ret;
        jpc_tagtreenode_t *leaf;
        int n;
        int t1;
        int t2;
        int adjust;
        int maxadjust;
        int datalen;
        int numnewpasses;
        int passcount;
        jpc_enc_tile_t *tile;
        jpc_enc_prc_t *prc;
        jpc_enc_cp_t *cp;
        jpc_ms_t *ms;

        tile = enc->curtile;
        cp = enc->cp;

        if (cp->tcp.csty & JPC_COD_SOP) {
                if (!(ms = jpc_ms_create(JPC_MS_SOP))) {
                        return -1;
                }
                ms->parms.sop.seqno = jpc_pi_getind(tile->pi);
                if (jpc_putms(out, enc->cstate, ms)) {
                        return -1;
                }
                jpc_ms_destroy(ms);
        }

        outb = jpc_bitstream_sopen(out, "w+");
        assert(outb);

        if (jpc_bitstream_putbit(outb, 1) == EOF) {
                return -1;
        }
        JAS_DBGLOG(10, ("\n"));
        JAS_DBGLOG(10, ("present. "));

        comp = &tile->tcmpts[compno];
        lvl = &comp->rlvls[lvlno];
        endbands = &lvl->bands[lvl->numbands];
        for (band = lvl->bands; band != endbands; ++band) {
                if (!band->data) {
                        continue;
                }
                prc = &band->prcs[prcno];
                if (!prc->cblks) {
                        continue;
                }

                endcblks = &prc->cblks[prc->numcblks];
                for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
                        if (!lyrno) {
                                leaf = jpc_tagtree_getleaf(prc->nlibtree, cblk - prc->cblks);
                                jpc_tagtree_setvalue(prc->nlibtree, leaf, cblk->numimsbs);
                        }
                        pass = cblk->curpass;
                        included = (pass && pass->lyrno == lyrno);
                        if (included && (!cblk->numencpasses)) {
                                assert(pass->lyrno == lyrno);
                                leaf = jpc_tagtree_getleaf(prc->incltree,
                                  cblk - prc->cblks);
                                jpc_tagtree_setvalue(prc->incltree, leaf, pass->lyrno);
                        }
                }

                endcblks = &prc->cblks[prc->numcblks];
                for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
                        pass = cblk->curpass;
                        included = (pass && pass->lyrno == lyrno);
                        if (!cblk->numencpasses) {
                                leaf = jpc_tagtree_getleaf(prc->incltree,
                                  cblk - prc->cblks);
                                if (jpc_tagtree_encode(prc->incltree, leaf, lyrno
                                  + 1, outb) < 0) {
                                        return -1;
                                }
                        } else {
                                if (jpc_bitstream_putbit(outb, included) == EOF) {
                                        return -1;
                                }
                        }
                        JAS_DBGLOG(10, ("included=%d ", included));
                        if (!included) {
                                continue;
                        }
                        if (!cblk->numencpasses) {
                                i = 1;
                                leaf = jpc_tagtree_getleaf(prc->nlibtree, cblk - prc->cblks);
                                for (;;) {
                                        if ((ret = jpc_tagtree_encode(prc->nlibtree, leaf, i, outb)) < 0) {
                                                return -1;
                                        }
                                        if (ret) {
                                                break;
                                        }
                                        ++i;
                                }
                                assert(leaf->known_ && i == leaf->value_ + 1);
                        }

                        endpasses = &cblk->passes[cblk->numpasses];
                        startpass = pass;
                        endpass = startpass;
                        while (endpass != endpasses && endpass->lyrno == lyrno){
                                ++endpass;
                        }
                        numnewpasses = endpass - startpass;
                        if (jpc_putnumnewpasses(outb, numnewpasses)) {
                                return -1;
                        }
                        JAS_DBGLOG(10, ("numnewpasses=%d ", numnewpasses));

                        lastpass = endpass - 1;
                        n = startpass->start;
                        passcount = 1;
                        maxadjust = 0;
                        for (pass = startpass; pass != endpass; ++pass) {
                                if (pass->term || pass == lastpass) {
                                        datalen = pass->end - n;
                                        t1 = jpc_firstone(datalen) + 1;
                                        t2 = cblk->numlenbits + jpc_floorlog2(passcount);
                                        adjust = JAS_MAX(t1 - t2, 0);
                                        maxadjust = JAS_MAX(adjust, maxadjust);
                                        n += datalen;
                                        passcount = 1;
                                } else {
                                        ++passcount;
                                }
                        }
                        if (jpc_putcommacode(outb, maxadjust)) {
                                return -1;
                        }
                        cblk->numlenbits += maxadjust;

                        lastpass = endpass - 1;
                        n = startpass->start;
                        passcount = 1;
                        for (pass = startpass; pass != endpass; ++pass) {
                                if (pass->term || pass == lastpass) {
                                        datalen = pass->end - n;
assert(jpc_firstone(datalen) < cblk->numlenbits + jpc_floorlog2(passcount));
                                        if (jpc_bitstream_putbits(outb, cblk->numlenbits + jpc_floorlog2(passcount), datalen) == EOF) {
                                                return -1;
                                        }
                                        n += datalen;
                                        passcount = 1;
                                } else {
                                        ++passcount;
                                }
                        }
                }
        }

        jpc_bitstream_outalign(outb, 0);
        jpc_bitstream_close(outb);

        if (cp->tcp.csty & JPC_COD_EPH) {
                if (!(ms = jpc_ms_create(JPC_MS_EPH))) {
                        return -1;
                }
                jpc_putms(out, enc->cstate, ms);
                jpc_ms_destroy(ms);
        }

        comp = &tile->tcmpts[compno];
        lvl = &comp->rlvls[lvlno];
        endbands = &lvl->bands[lvl->numbands];
        for (band = lvl->bands; band != endbands; ++band) {
                if (!band->data) {
                        continue;
                }
                prc = &band->prcs[prcno];
                if (!prc->cblks) {
                        continue;
                }
                endcblks = &prc->cblks[prc->numcblks];
                for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
                        pass = cblk->curpass;

                        if (!pass) {
                                continue;
                        }
                        if (pass->lyrno != lyrno) {
                                assert(pass->lyrno < 0 || pass->lyrno > lyrno);
                                continue;
                        }

                        endpasses = &cblk->passes[cblk->numpasses];
                        startpass = pass;
                        endpass = startpass;
                        while (endpass != endpasses && endpass->lyrno == lyrno){
                                ++endpass;
                        }
                        lastpass = endpass - 1;
                        numnewpasses = endpass - startpass;

                        jas_stream_seek(cblk->stream, startpass->start, SEEK_SET);
                        assert(jas_stream_tell(cblk->stream) == startpass->start);
                        if (jas_stream_copy(out, cblk->stream, lastpass->end - startpass->start)) {
                                return -1;
                        }
                        cblk->curpass = (endpass != endpasses) ? endpass : 0;
                        cblk->numencpasses += numnewpasses;

                }
        }

        return 0;
}

void jpc_save_t2state(jpc_enc_t *enc)
{
/* stream pos in embedded T1 stream may be wrong since not saved/restored! */

        jpc_enc_tcmpt_t *comp;
        jpc_enc_tcmpt_t *endcomps;
        jpc_enc_rlvl_t *lvl;
        jpc_enc_rlvl_t *endlvls;
        jpc_enc_band_t *band;
        jpc_enc_band_t *endbands;
        jpc_enc_cblk_t *cblk;
        jpc_enc_cblk_t *endcblks;
        jpc_enc_tile_t *tile;
        uint_fast32_t prcno;
        jpc_enc_prc_t *prc;

        tile = enc->curtile;

        endcomps = &tile->tcmpts[tile->numtcmpts];
        for (comp = tile->tcmpts; comp != endcomps; ++comp) {
                endlvls = &comp->rlvls[comp->numrlvls];
                for (lvl = comp->rlvls; lvl != endlvls; ++lvl) {
                        if (!lvl->bands) {
                                continue;
                        }
                        endbands = &lvl->bands[lvl->numbands];
                        for (band = lvl->bands; band != endbands; ++band) {
                                if (!band->data) {
                                        continue;
                                }
                                for (prcno = 0, prc = band->prcs; prcno < lvl->numprcs; ++prcno, ++prc) {
                                        if (!prc->cblks) {
                                                continue;
                                        }
                                        jpc_tagtree_copy(prc->savincltree, prc->incltree);
                                        jpc_tagtree_copy(prc->savnlibtree, prc->nlibtree);
                                        endcblks = &prc->cblks[prc->numcblks];
                                        for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
                                                cblk->savedcurpass = cblk->curpass;
                                                cblk->savednumencpasses = cblk->numencpasses;
                                                cblk->savednumlenbits = cblk->numlenbits;
                                        }
                                }
                        }
                }
        }

}

void jpc_restore_t2state(jpc_enc_t *enc)
{

        jpc_enc_tcmpt_t *comp;
        jpc_enc_tcmpt_t *endcomps;
        jpc_enc_rlvl_t *lvl;
        jpc_enc_rlvl_t *endlvls;
        jpc_enc_band_t *band;
        jpc_enc_band_t *endbands;
        jpc_enc_cblk_t *cblk;
        jpc_enc_cblk_t *endcblks;
        jpc_enc_tile_t *tile;
        uint_fast32_t prcno;
        jpc_enc_prc_t *prc;

        tile = enc->curtile;

        endcomps = &tile->tcmpts[tile->numtcmpts];
        for (comp = tile->tcmpts; comp != endcomps; ++comp) {
                endlvls = &comp->rlvls[comp->numrlvls];
                for (lvl = comp->rlvls; lvl != endlvls; ++lvl) {
                        if (!lvl->bands) {
                                continue;
                        }
                        endbands = &lvl->bands[lvl->numbands];
                        for (band = lvl->bands; band != endbands; ++band) {
                                if (!band->data) {
                                        continue;
                                }
                                for (prcno = 0, prc = band->prcs; prcno < lvl->numprcs; ++prcno, ++prc) {
                                        if (!prc->cblks) {
                                                continue;
                                        }
                                        jpc_tagtree_copy(prc->incltree, prc->savincltree);
                                        jpc_tagtree_copy(prc->nlibtree, prc->savnlibtree);
                                        endcblks = &prc->cblks[prc->numcblks];
                                        for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
                                                cblk->curpass = cblk->savedcurpass;
                                                cblk->numencpasses = cblk->savednumencpasses;
                                                cblk->numlenbits = cblk->savednumlenbits;
                                        }
                                }
                        }
                }
        }
}

void jpc_init_t2state(jpc_enc_t *enc, int raflag)
{
/* It is assumed that band->numbps and cblk->numbps precomputed */

        jpc_enc_tcmpt_t *comp;
        jpc_enc_tcmpt_t *endcomps;
        jpc_enc_rlvl_t *lvl;
        jpc_enc_rlvl_t *endlvls;
        jpc_enc_band_t *band;
        jpc_enc_band_t *endbands;
        jpc_enc_cblk_t *cblk;
        jpc_enc_cblk_t *endcblks;
        jpc_enc_pass_t *pass;
        jpc_enc_pass_t *endpasses;
        jpc_tagtreenode_t *leaf;
        jpc_enc_tile_t *tile;
        uint_fast32_t prcno;
        jpc_enc_prc_t *prc;

        tile = enc->curtile;

        endcomps = &tile->tcmpts[tile->numtcmpts];
        for (comp = tile->tcmpts; comp != endcomps; ++comp) {
                endlvls = &comp->rlvls[comp->numrlvls];
                for (lvl = comp->rlvls; lvl != endlvls; ++lvl) {
                        if (!lvl->bands) {
                                continue;
                        }
                        endbands = &lvl->bands[lvl->numbands];
                        for (band = lvl->bands; band != endbands; ++band) {
                                if (!band->data) {
                                        continue;
                                }
                                for (prcno = 0, prc = band->prcs; prcno < lvl->numprcs; ++prcno, ++prc) {
                                        if (!prc->cblks) {
                                                continue;
                                        }
                                        jpc_tagtree_reset(prc->incltree);
                                        jpc_tagtree_reset(prc->nlibtree);
                                        endcblks = &prc->cblks[prc->numcblks];
                                        for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
                                                if (jas_stream_rewind(cblk->stream)) {
                                                        assert(0);
                                                }
                                                cblk->curpass = (cblk->numpasses > 0) ? cblk->passes : 0;
                                                cblk->numencpasses = 0;
                                                cblk->numlenbits = 3;
                                                cblk->numimsbs = band->numbps - cblk->numbps;
                                                assert(cblk->numimsbs >= 0);
                                                leaf = jpc_tagtree_getleaf(prc->nlibtree, cblk - prc->cblks);
                                                jpc_tagtree_setvalue(prc->nlibtree, leaf, cblk->numimsbs);

                                                if (raflag) {
                                                        endpasses = &cblk->passes[cblk->numpasses];
                                                        for (pass = cblk->passes; pass != endpasses; ++pass) {
                                                                pass->lyrno = -1;
                                                                pass->lyrno = 0;
                                                        }
                                                }
                                        }
                                }
                        }
                }
        }

}

jpc_pi_t *jpc_enc_pi_create(jpc_enc_cp_t *cp, jpc_enc_tile_t *tile)
{
        jpc_pi_t *pi;
        int compno;
        jpc_picomp_t *picomp;
        jpc_pirlvl_t *pirlvl;
        jpc_enc_tcmpt_t *tcomp;
        int rlvlno;
        jpc_enc_rlvl_t *rlvl;
        int prcno;
        int *prclyrno;

        if (!(pi = jpc_pi_create0())) {
                return 0;
        }
        pi->pktno = -1;
        pi->numcomps = cp->numcmpts;
        if (!(pi->picomps = jas_malloc(pi->numcomps * sizeof(jpc_picomp_t)))) {
                jpc_pi_destroy(pi);
                return 0;
        }
        for (compno = 0, picomp = pi->picomps; compno < pi->numcomps; ++compno,
          ++picomp) {
                picomp->pirlvls = 0;
        }

        for (compno = 0, tcomp = tile->tcmpts, picomp = pi->picomps;
          compno < pi->numcomps; ++compno, ++tcomp, ++picomp) {
                picomp->numrlvls = tcomp->numrlvls;
                if (!(picomp->pirlvls = jas_malloc(picomp->numrlvls *
                  sizeof(jpc_pirlvl_t)))) {
                        jpc_pi_destroy(pi);
                        return 0;
                }
                for (rlvlno = 0, pirlvl = picomp->pirlvls; rlvlno <
                  picomp->numrlvls; ++rlvlno, ++pirlvl) {
                        pirlvl->prclyrnos = 0;
                }
                for (rlvlno = 0, pirlvl = picomp->pirlvls, rlvl = tcomp->rlvls;
                  rlvlno < picomp->numrlvls; ++rlvlno, ++pirlvl, ++rlvl) {
/* XXX sizeof(long) should be sizeof different type */
                        pirlvl->numprcs = rlvl->numprcs;
                        if (rlvl->numprcs) {
                                if (!(pirlvl->prclyrnos = jas_malloc(pirlvl->numprcs *
                                  sizeof(long)))) {
                                        jpc_pi_destroy(pi);
                                        return 0;
                                }
                        } else {
                                pirlvl->prclyrnos = 0;
                        }
                }
        }

        pi->maxrlvls = 0;
        for (compno = 0, tcomp = tile->tcmpts, picomp = pi->picomps;
          compno < pi->numcomps; ++compno, ++tcomp, ++picomp) {
                picomp->hsamp = cp->ccps[compno].sampgrdstepx;
                picomp->vsamp = cp->ccps[compno].sampgrdstepy;
                for (rlvlno = 0, pirlvl = picomp->pirlvls, rlvl = tcomp->rlvls;
                  rlvlno < picomp->numrlvls; ++rlvlno, ++pirlvl, ++rlvl) {
                        pirlvl->prcwidthexpn = rlvl->prcwidthexpn;
                        pirlvl->prcheightexpn = rlvl->prcheightexpn;
                        for (prcno = 0, prclyrno = pirlvl->prclyrnos;
                          prcno < pirlvl->numprcs; ++prcno, ++prclyrno) {
                                *prclyrno = 0;
                        }
                        pirlvl->numhprcs = rlvl->numhprcs;
                }
                if (pi->maxrlvls < tcomp->numrlvls) {
                        pi->maxrlvls = tcomp->numrlvls;
                }
        }

        pi->numlyrs = tile->numlyrs;
        pi->xstart = tile->tlx;
        pi->ystart = tile->tly;
        pi->xend = tile->brx;
        pi->yend = tile->bry;

        pi->picomp = 0;
        pi->pirlvl = 0;
        pi->x = 0;
        pi->y = 0;
        pi->compno = 0;
        pi->rlvlno = 0;
        pi->prcno = 0;
        pi->lyrno = 0;
        pi->xstep = 0;
        pi->ystep = 0;

        pi->pchgno = -1;

        pi->defaultpchg.prgord = tile->prg;
        pi->defaultpchg.compnostart = 0;
        pi->defaultpchg.compnoend = pi->numcomps;
        pi->defaultpchg.rlvlnostart = 0;
        pi->defaultpchg.rlvlnoend = pi->maxrlvls;
        pi->defaultpchg.lyrnoend = pi->numlyrs;
        pi->pchg = 0;

        pi->valid = 0;

        return pi;
}
