/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2003 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 *
 * JasPer License Version 2.0
 *
 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person (the
 * "User") obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 *
 * 1.  The above copyright notices and this permission notice (which
 * includes the disclaimer below) shall be included in all copies or
 * substantial portions of the Software.
 *
 * 2.  The name of a copyright holder shall not be used to endorse or
 * promote products derived from the Software without specific prior
 * written permission.
 *
 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
 * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
 * PROPERTY RIGHTS OR OTHERWISE.  AS A CONDITION TO EXERCISING THE RIGHTS
 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY.  THE SOFTWARE
 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
 * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
 *
 * __END_OF_JASPER_LICENSE__
 */

/*
 * JP2 Library
 *
 * $Id$
 */

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

#include "jasper/jas_image.h"
#include "jasper/jas_stream.h"
#include "jasper/jas_math.h"
#include "jasper/jas_debug.h"
#include "jasper/jas_malloc.h"
#include "jasper/jas_version.h"

#include "jp2_cod.h"
#include "jp2_dec.h"

#define	JP2_VALIDATELEN	(JAS_MIN(JP2_JP_LEN + 16, JAS_STREAM_MAXPUTBACK))

static jp2_dec_t *jp2_dec_create(void);
static void jp2_dec_destroy(jp2_dec_t *dec);
static int jp2_getcs(jp2_colr_t *colr);
static int fromiccpcs(int cs);
static int jp2_getct(int colorspace, int type, int assoc);

/******************************************************************************\
* Functions.
\******************************************************************************/

jas_image_t *jp2_decode(jas_stream_t *in, char *optstr)
{
    jp2_box_t *box;
    int found;
    jas_image_t *image;
    jp2_dec_t *dec;
    bool samedtype;
    int dtype;
    unsigned int i;
    jp2_cmap_t *cmapd;
    jp2_pclr_t *pclrd;
    jp2_cdef_t *cdefd;
    unsigned int channo;
    int newcmptno;
    int_fast32_t *lutents;
#if 0
    jp2_cdefchan_t *cdefent;
    int cmptno;
#endif
    jp2_cmapent_t *cmapent;
    jas_icchdr_t icchdr;
    jas_iccprof_t *iccprof;

    dec = 0;
    box = 0;
    image = 0;

    if (!(dec = jp2_dec_create())) {
        goto error;
    }

    /* Get the first box.  This should be a JP box. */
    if (!(box = jp2_box_get(in))) {
        jas_eprintf("error: cannot get box\n");
        goto error;
    }
    if (box->type != JP2_BOX_JP) {
        jas_eprintf("error: expecting signature box\n");
        goto error;
    }
    if (box->data.jp.magic != JP2_JP_MAGIC) {
        jas_eprintf("incorrect magic number\n");
        goto error;
    }
    jp2_box_destroy(box);
    box = 0;

    /* Get the second box.  This should be a FTYP box. */
    if (!(box = jp2_box_get(in))) {
        goto error;
    }
    if (box->type != JP2_BOX_FTYP) {
        jas_eprintf("expecting file type box\n");
        goto error;
    }
    jp2_box_destroy(box);
    box = 0;

    /* Get more boxes... */
    found = 0;
    while ((box = jp2_box_get(in))) {
        if (jas_getdbglevel() >= 1) {
            jas_eprintf("box type %s\n", box->info->name);
        }
        switch (box->type) {
        case JP2_BOX_JP2C:
            found = 1;
            break;
        case JP2_BOX_IHDR:
            if (!dec->ihdr) {
                dec->ihdr = box;
                box = 0;
            }
            break;
        case JP2_BOX_BPCC:
            if (!dec->bpcc) {
                dec->bpcc = box;
                box = 0;
            }
            break;
        case JP2_BOX_CDEF:
            if (!dec->cdef) {
                dec->cdef = box;
                box = 0;
            }
            break;
        case JP2_BOX_PCLR:
            if (!dec->pclr) {
                dec->pclr = box;
                box = 0;
            }
            break;
        case JP2_BOX_CMAP:
            if (!dec->cmap) {
                dec->cmap = box;
                box = 0;
            }
            break;
        case JP2_BOX_COLR:
            if (!dec->colr) {
                dec->colr = box;
                box = 0;
            }
            break;
        }
        if (box) {
            jp2_box_destroy(box);
            box = 0;
        }
        if (found) {
            break;
        }
    }

    if (!found) {
        jas_eprintf("error: no code stream found\n");
        goto error;
    }

    if (!(dec->image = jpc_decode(in, optstr))) {
        jas_eprintf("error: cannot decode code stream\n");
        goto error;
    }

    /* An IHDR box must be present. */
    if (!dec->ihdr) {
        jas_eprintf("error: missing IHDR box\n");
        goto error;
    }

    /* Does the number of components indicated in the IHDR box match
      the value specified in the code stream? */
    if (dec->ihdr->data.ihdr.numcmpts != JAS_CAST(uint, jas_image_numcmpts(dec->image))) {
        jas_eprintf("warning: number of components mismatch\n");
    }

    /* At least one component must be present. */
    if (!jas_image_numcmpts(dec->image)) {
        jas_eprintf("error: no components\n");
        goto error;
    }

    /* Determine if all components have the same data type. */
    samedtype = true;
    dtype = jas_image_cmptdtype(dec->image, 0);
    for (i = 1; i < JAS_CAST(uint, jas_image_numcmpts(dec->image)); ++i) {
        if (jas_image_cmptdtype(dec->image, i) != dtype) {
            samedtype = false;
            break;
        }
    }

    /* Is the component data type indicated in the IHDR box consistent
      with the data in the code stream? */
    if ((samedtype && dec->ihdr->data.ihdr.bpc != JP2_DTYPETOBPC(dtype)) ||
      (!samedtype && dec->ihdr->data.ihdr.bpc != JP2_IHDR_BPCNULL)) {
        jas_eprintf("warning: component data type mismatch\n");
    }

    /* Is the compression type supported? */
    if (dec->ihdr->data.ihdr.comptype != JP2_IHDR_COMPTYPE) {
        jas_eprintf("error: unsupported compression type\n");
        goto error;
    }

    if (dec->bpcc) {
        /* Is the number of components indicated in the BPCC box
          consistent with the code stream data? */
        if (dec->bpcc->data.bpcc.numcmpts != JAS_CAST(uint, jas_image_numcmpts(
          dec->image))) {
            jas_eprintf("warning: number of components mismatch\n");
        }
        /* Is the component data type information indicated in the BPCC
          box consistent with the code stream data? */
        if (!samedtype) {
            for (i = 0; i < JAS_CAST(uint, jas_image_numcmpts(dec->image)); ++i) {
                if (jas_image_cmptdtype(dec->image, i) != JP2_BPCTODTYPE(dec->bpcc->data.bpcc.bpcs[i])) {
                    jas_eprintf("warning: component data type mismatch\n");
                }
            }
        } else {
            jas_eprintf("warning: superfluous BPCC box\n");
        }
    }

    /* A COLR box must be present. */
    if (!dec->colr) {
        jas_eprintf("error: no COLR box\n");
        goto error;
    }

    switch (dec->colr->data.colr.method) {
    case JP2_COLR_ENUM:
        jas_image_setclrspc(dec->image, jp2_getcs(&dec->colr->data.colr));
        break;
    case JP2_COLR_ICC:
        iccprof = jas_iccprof_createfrombuf(dec->colr->data.colr.iccp,
          dec->colr->data.colr.iccplen);
        assert(iccprof);
        jas_iccprof_gethdr(iccprof, &icchdr);
        jas_eprintf("ICC Profile CS %08x\n", icchdr.colorspc);
        jas_image_setclrspc(dec->image, fromiccpcs(icchdr.colorspc));
        dec->image->cmprof_ = jas_cmprof_createfromiccprof(iccprof);
        assert(dec->image->cmprof_);
        jas_iccprof_destroy(iccprof);
        break;
    }

    /* If a CMAP box is present, a PCLR box must also be present. */
    if (dec->cmap && !dec->pclr) {
        jas_eprintf("warning: missing PCLR box or superfluous CMAP box\n");
        jp2_box_destroy(dec->cmap);
        dec->cmap = 0;
    }

    /* If a CMAP box is not present, a PCLR box must not be present. */
    if (!dec->cmap && dec->pclr) {
        jas_eprintf("warning: missing CMAP box or superfluous PCLR box\n");
        jp2_box_destroy(dec->pclr);
        dec->pclr = 0;
    }

    /* Determine the number of channels (which is essentially the number
      of components after any palette mappings have been applied). */
    dec->numchans = dec->cmap ? dec->cmap->data.cmap.numchans : JAS_CAST(uint, jas_image_numcmpts(dec->image));

    /* Perform a basic sanity check on the CMAP box if present. */
    if (dec->cmap) {
        for (i = 0; i < dec->numchans; ++i) {
            /* Is the component number reasonable? */
            if (dec->cmap->data.cmap.ents[i].cmptno >= JAS_CAST(uint, jas_image_numcmpts(dec->image))) {
                jas_eprintf("error: invalid component number in CMAP box\n");
                goto error;
            }
            /* Is the LUT index reasonable? */
            if (dec->cmap->data.cmap.ents[i].pcol >= dec->pclr->data.pclr.numchans) {
                jas_eprintf("error: invalid CMAP LUT index\n");
                goto error;
            }
        }
    }

    /* Allocate space for the channel-number to component-number LUT. */
    if (!(dec->chantocmptlut = jas_malloc(dec->numchans * sizeof(uint_fast16_t)))) {
        jas_eprintf("error: no memory\n");
        goto error;
    }

    if (!dec->cmap) {
        for (i = 0; i < dec->numchans; ++i) {
            dec->chantocmptlut[i] = i;
        }
    } else {
        cmapd = &dec->cmap->data.cmap;
        pclrd = &dec->pclr->data.pclr;
        cdefd = &dec->cdef->data.cdef;
        for (channo = 0; channo < cmapd->numchans; ++channo) {
            cmapent = &cmapd->ents[channo];
            if (cmapent->map == JP2_CMAP_DIRECT) {
                dec->chantocmptlut[channo] = channo;
            } else if (cmapent->map == JP2_CMAP_PALETTE) {
                lutents = jas_malloc(pclrd->numlutents * sizeof(int_fast32_t));
                for (i = 0; i < pclrd->numlutents; ++i) {
                    lutents[i] = pclrd->lutdata[cmapent->pcol + i * pclrd->numchans];
                }
                newcmptno = jas_image_numcmpts(dec->image);
                jas_image_depalettize(dec->image, cmapent->cmptno, pclrd->numlutents, lutents, JP2_BPCTODTYPE(pclrd->bpc[cmapent->pcol]), newcmptno);
                dec->chantocmptlut[channo] = newcmptno;
                jas_free(lutents);
#if 0
                if (dec->cdef) {
                    cdefent = jp2_cdef_lookup(cdefd, channo);
                    if (!cdefent) {
                        abort();
                    }
                jas_image_setcmpttype(dec->image, newcmptno, jp2_getct(jas_image_clrspc(dec->image), cdefent->type, cdefent->assoc));
                } else {
                jas_image_setcmpttype(dec->image, newcmptno, jp2_getct(jas_image_clrspc(dec->image), 0, channo + 1));
                }
#endif
            }
        }
    }

    /* Mark all components as being of unknown type. */

    for (i = 0; i < JAS_CAST(uint, jas_image_numcmpts(dec->image)); ++i) {
        jas_image_setcmpttype(dec->image, i, JAS_IMAGE_CT_UNKNOWN);
    }

    /* Determine the type of each component. */
    if (dec->cdef) {
        for (i = 0; i < dec->numchans; ++i) {
            jas_image_setcmpttype(dec->image,
              dec->chantocmptlut[dec->cdef->data.cdef.ents[i].channo],
              jp2_getct(jas_image_clrspc(dec->image),
              dec->cdef->data.cdef.ents[i].type, dec->cdef->data.cdef.ents[i].assoc));
        }
    } else {
        for (i = 0; i < dec->numchans; ++i) {
            jas_image_setcmpttype(dec->image, dec->chantocmptlut[i],
              jp2_getct(jas_image_clrspc(dec->image), 0, i + 1));
        }
    }

    /* Delete any components that are not of interest. */
    for (i = jas_image_numcmpts(dec->image); i > 0; --i) {
        if (jas_image_cmpttype(dec->image, i - 1) == JAS_IMAGE_CT_UNKNOWN) {
            jas_image_delcmpt(dec->image, i - 1);
        }
    }

    /* Ensure that some components survived. */
    if (!jas_image_numcmpts(dec->image)) {
        jas_eprintf("error: no components\n");
        goto error;
    }
#if 0
jas_eprintf("no of components is %d\n", jas_image_numcmpts(dec->image));
#endif

    /* Prevent the image from being destroyed later. */
    image = dec->image;
    dec->image = 0;

    jp2_dec_destroy(dec);

    return image;

error:
    if (box) {
        jp2_box_destroy(box);
    }
    if (dec) {
        jp2_dec_destroy(dec);
    }
    return 0;
}

int jp2_validate(jas_stream_t *in)
{
    char buf[JP2_VALIDATELEN];
    int i;
    int n;
#if 0
    jas_stream_t *tmpstream;
    jp2_box_t *box;
#endif

    assert(JAS_STREAM_MAXPUTBACK >= JP2_VALIDATELEN);

    /* Read the validation data (i.e., the data used for detecting
      the format). */
    if ((n = jas_stream_read(in, buf, JP2_VALIDATELEN)) < 0) {
        return -1;
    }

    /* Put the validation data back onto the stream, so that the
      stream position will not be changed. */
    for (i = n - 1; i >= 0; --i) {
        if (jas_stream_ungetc(in, buf[i]) == EOF) {
            return -1;
        }
    }

    /* Did we read enough data? */
    if (n < JP2_VALIDATELEN) {
        return -1;
    }

    /* Is the box type correct? */
    if (((buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]) !=
      JP2_BOX_JP)
    {
        return -1;
    }

    return 0;
}

static jp2_dec_t *jp2_dec_create(void)
{
    jp2_dec_t *dec;

    if (!(dec = jas_malloc(sizeof(jp2_dec_t)))) {
        return 0;
    }
    dec->ihdr = 0;
    dec->bpcc = 0;
    dec->cdef = 0;
    dec->pclr = 0;
    dec->image = 0;
    dec->chantocmptlut = 0;
    dec->cmap = 0;
    dec->colr = 0;
    return dec;
}

static void jp2_dec_destroy(jp2_dec_t *dec)
{
    if (dec->ihdr) {
        jp2_box_destroy(dec->ihdr);
    }
    if (dec->bpcc) {
        jp2_box_destroy(dec->bpcc);
    }
    if (dec->cdef) {
        jp2_box_destroy(dec->cdef);
    }
    if (dec->pclr) {
        jp2_box_destroy(dec->pclr);
    }
    if (dec->image) {
        jas_image_destroy(dec->image);
    }
    if (dec->cmap) {
        jp2_box_destroy(dec->cmap);
    }
    if (dec->colr) {
        jp2_box_destroy(dec->colr);
    }
    if (dec->chantocmptlut) {
        jas_free(dec->chantocmptlut);
    }
    jas_free(dec);
}

static int jp2_getct(int colorspace, int type, int assoc)
{
    if (type == 1 && assoc == 0) {
        return JAS_IMAGE_CT_OPACITY;
    }
    if (type == 0 && assoc >= 1 && assoc <= 65534) {
        switch (colorspace) {
        case JAS_CLRSPC_FAM_RGB:
            switch (assoc) {
            case JP2_CDEF_RGB_R:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_R);
                break;
            case JP2_CDEF_RGB_G:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_G);
                break;
            case JP2_CDEF_RGB_B:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_B);
                break;
            }
            break;
        case JAS_CLRSPC_FAM_YCBCR:
            switch (assoc) {
            case JP2_CDEF_YCBCR_Y:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_YCBCR_Y);
                break;
            case JP2_CDEF_YCBCR_CB:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_YCBCR_CB);
                break;
            case JP2_CDEF_YCBCR_CR:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_YCBCR_CR);
                break;
            }
            break;
        case JAS_CLRSPC_FAM_GRAY:
            switch (assoc) {
            case JP2_CDEF_GRAY_Y:
                return JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_GRAY_Y);
                break;
            }
            break;
        default:
            return JAS_IMAGE_CT_COLOR(assoc - 1);
            break;
        }
    }
    return JAS_IMAGE_CT_UNKNOWN;
}

static int jp2_getcs(jp2_colr_t *colr)
{
    if (colr->method == JP2_COLR_ENUM) {
        switch (colr->csid) {
        case JP2_COLR_SRGB:
            return JAS_CLRSPC_SRGB;
            break;
        case JP2_COLR_SYCC:
            return JAS_CLRSPC_SYCBCR;
            break;
        case JP2_COLR_SGRAY:
            return JAS_CLRSPC_SGRAY;
            break;
        }
    }
    return JAS_CLRSPC_UNKNOWN;
}

static int fromiccpcs(int cs)
{
    switch (cs) {
    case ICC_CS_RGB:
        return JAS_CLRSPC_GENRGB;
        break;
    case ICC_CS_YCBCR:
        return JAS_CLRSPC_GENYCBCR;
        break;
    case ICC_CS_GRAY:
        return JAS_CLRSPC_GENGRAY;
        break;
    }
    return JAS_CLRSPC_UNKNOWN;
}
