/*
 * The copyright in this software is being made available under the 2-clauses
 * BSD License, included below. This software may be subject to other third
 * party and contributor rights, including patent rights, and no such rights
 * are granted under this license.
 *
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
 * 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 volume_info Structure to create an index file
@param tileno Number of the tile encoded
@param cp Coding parameters
@return Number of bytes encoded from the packet
*/
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_volume_info_t *volume_info, int tileno, opj_cp_t *cp);
/**
Initialize the segment decoder
@param seg Segment instance
@param cblksty Codeblock style
@param first Is first segment
*/
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 Number of bytes decoded from the packet
*/
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_volume_info_t * volume_info, int tileno, opj_cp_t *cp)
{
    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 & J3D_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] = (volume_info) ? (volume_info->num % 65536) / 256 : (0 % 65536) / 256 ;
        sop[5] = (volume_info) ? (volume_info->num % 65536) % 256 : (0 % 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->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                    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->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                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->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                cblkno++) {
            opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
            opj_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(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++;
                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(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++;
                len += pass->len;
                if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
                    bio_write(bio, len, cblk->numlenbits + int_floorlog2(nump));
                    len = 0;
                    nump = 0;
                }
            }

        }
    }


    if (bio_flush(bio)) {
        bio_destroy(bio);
        return -999;        /* modified to eliminate longjmp !! */
    }

    c += bio_numbytes(bio);

    bio_destroy(bio);

    /* <EPH 0xff92> */
    if (tcp->csty & J3D_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->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                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 (volume_info && volume_info->index_write && volume_info->index_on) {
                opj_tile_info_t *info_TL = &volume_info->tile[tileno];
                opj_packet_info_t *info_PK = &info_TL->packet[volume_info->num];
                info_PK->disto += layer->disto;
                if (volume_info->D_max < info_PK->disto) {
                    volume_info->D_max = info_PK->disto;
                }
            }
            /* </ADD> */
        }
    }

    return (c - dest);
}

static void t2_init_seg(opj_tcd_seg_t * seg, int cblksty, int first)
{
    seg->numpasses = 0;
    seg->len = 0;
    if (cblksty & J3D_CCP_CBLKSTY_TERMALL) {
        seg->maxpasses = 1;
    } else if (cblksty & J3D_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;
    }
}

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) ||
                    (band->z1 - band->z0 == 0)) {
                continue;
            }

            tgt_reset(prc->incltree);
            tgt_reset(prc->imsbtree);
            for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                    cblkno++) {
                opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
                cblk->numsegs = 0;
            }
        }
    }

    /* SOP markers */

    if (tcp->csty & J3D_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, 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 & J3D_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 += cp->ppm_data - hd;
            cp->ppm_data = hd;
            return (c - src);
        }
        if (tcp->ppt == 1) {    /* PPT case */
            tcp->ppt_len += tcp->ppt_data - hd;
            tcp->ppt_data = hd;
            return (c - src);
        }

        return (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) ||
                (band->z1 - band->z0 == 0)) {
            continue;
        }

        for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                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 & J3D_CP_CSTY_EPH) {
        if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
            opj_event_msg(t2->cinfo, EVT_ERROR, "Expected EPH marker\n");
            return -999;
        } else {
            hd += 2;
        }
    }

    if (cp->ppm == 1) {
        cp->ppm_len += cp->ppm_data - hd;
        cp->ppm_data = hd;
    } else if (tcp->ppt == 1) {
        tcp->ppt_len += 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) ||
                (band->z1 - band->z0 == 0)) {
            continue;
        }

        for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2];
                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 (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_volume_info_t *volume_info)
{
    unsigned char *c = dest;
    int e = 0;
    opj_pi_iterator_t *pi = NULL;
    int pino;

    opj_volume_t *volume = t2->volume;
    opj_cp_t *cp = t2->cp;

    /* create a packet iterator */
    pi = pi_create(volume, cp, tileno);
    if (!pi) {
        fprintf(stdout, "[ERROR] Failed to create a pi structure\n");
        return -999;
    }

    if (volume_info) {
        volume_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, dest + len - c,
                                     volume_info, tileno, cp);
                /*opj_event_msg(t2->cinfo, EVT_INFO, "  t2_encode_packet: %d bytes coded\n",e);*/
                if (e == -999) {
                    break;
                } else {
                    c += e;
                }

                /* INDEX >> */
                if (volume_info && volume_info->index_on) {
                    if (volume_info->index_write) {
                        opj_tile_info_t *info_TL = &volume_info->tile[tileno];
                        opj_packet_info_t *info_PK = &info_TL->packet[volume_info->num];
                        if (!volume_info->num) {
                            info_PK->start_pos = info_TL->end_header + 1;
                        } else {
                            info_PK->start_pos = info_TL->packet[volume_info->num - 1].end_pos + 1;
                        }
                        info_PK->end_pos = info_PK->start_pos + e - 1;
                    }

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

    /* don't forget to release pi */
    pi_destroy(pi, cp, tileno);

    if (e == -999) {
        return e;
    }

    return (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, i;

    opj_volume_t *volume = t2->volume;
    opj_cp_t *cp = t2->cp;

    /* create a packet iterator */
    pi = pi_create(volume, 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, src + len - c, tile, &cp->tcps[tileno], &pi[pino]);
            } else {
                e = 0;
            }

            /* progression in resolution */
            for (i = 0; i < 3; i++) {
                volume->comps[pi[pino].compno].resno_decoded[i] = (e > 0) ? int_max(
                            pi[pino].resno, volume->comps[pi[pino].compno].resno_decoded[i]) :
                        volume->comps[pi[pino].compno].resno_decoded[i];
            }
            n++;

            if (e == -999) {        /* ADD */
                break;
            } else {
                opj_event_msg(t2->cinfo, EVT_INFO, "  t2_decode_packet: %d bytes decoded\n", e);
                c += e;
            }
        }
    }

    /* don't forget to release pi */
    pi_destroy(pi, cp, tileno);

    if (e == -999) {
        return e;
    }

    return (c - src);
}

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

opj_t2_t* t2_create(opj_common_ptr cinfo, opj_volume_t *volume, 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->volume = volume;
    t2->cp = cp;

    return t2;
}

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