/*
 * 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) 2002-2014, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2014, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux
 * Copyright (c) 2003-2014, Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * Copyright (c) 2006-2007, Parvatha Elangovan
 * Copyright (c) 2015, Matthieu Darbois
 * 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_apps_config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <zlib.h>
#include <png.h>

#include "openjpeg.h"
#include "convert.h"

#define PNG_MAGIC "\x89PNG\x0d\x0a\x1a\x0a"
#define MAGIC_SIZE 8
/* PNG allows bits per sample: 1, 2, 4, 8, 16 */


static void convert_16u32s_C1R(const OPJ_BYTE* pSrc, OPJ_INT32* pDst,
                               OPJ_SIZE_T length)
{
    OPJ_SIZE_T i;
    for (i = 0; i < length; i++) {
        OPJ_INT32 val0 = *pSrc++;
        OPJ_INT32 val1 = *pSrc++;
        pDst[i] = val0 << 8 | val1;
    }
}

opj_image_t *pngtoimage(const char *read_idf, opj_cparameters_t * params)
{
    png_structp  png = NULL;
    png_infop    info = NULL;
    double gamma;
    int bit_depth, interlace_type, compression_type, filter_type;
    OPJ_UINT32 i;
    png_uint_32  width, height = 0U;
    int color_type;
    FILE *reader = NULL;
    OPJ_BYTE** rows = NULL;
    OPJ_INT32* row32s = NULL;
    /* j2k: */
    opj_image_t *image = NULL;
    opj_image_cmptparm_t cmptparm[4];
    OPJ_UINT32 nr_comp;
    OPJ_BYTE sigbuf[8];
    convert_XXx32s_C1R cvtXXTo32s = NULL;
    convert_32s_CXPX cvtCxToPx = NULL;
    OPJ_INT32* planes[4];

    if ((reader = fopen(read_idf, "rb")) == NULL) {
        fprintf(stderr, "pngtoimage: can not open %s\n", read_idf);
        return NULL;
    }

    if (fread(sigbuf, 1, MAGIC_SIZE, reader) != MAGIC_SIZE
            || memcmp(sigbuf, PNG_MAGIC, MAGIC_SIZE) != 0) {
        fprintf(stderr, "pngtoimage: %s is no valid PNG file\n", read_idf);
        goto fin;
    }

    if ((png = png_create_read_struct(PNG_LIBPNG_VER_STRING,
                                      NULL, NULL, NULL)) == NULL) {
        goto fin;
    }
    if ((info = png_create_info_struct(png)) == NULL) {
        goto fin;
    }

    if (setjmp(png_jmpbuf(png))) {
        goto fin;
    }

    png_init_io(png, reader);
    png_set_sig_bytes(png, MAGIC_SIZE);

    png_read_info(png, info);

    if (png_get_IHDR(png, info, &width, &height,
                     &bit_depth, &color_type, &interlace_type,
                     &compression_type, &filter_type) == 0) {
        goto fin;
    }

    /* png_set_expand():
     * expand paletted images to RGB, expand grayscale images of
     * less than 8-bit depth to 8-bit depth, and expand tRNS chunks
     * to alpha channels.
     */
    if (color_type == PNG_COLOR_TYPE_PALETTE) {
        png_set_expand(png);
    }

    if (png_get_valid(png, info, PNG_INFO_tRNS)) {
        png_set_expand(png);
    }
    /* We might wan't to expand background */
    /*
    if(png_get_valid(png, info, PNG_INFO_bKGD)) {
        png_color_16p bgnd;
        png_get_bKGD(png, info, &bgnd);
        png_set_background(png, bgnd, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
    }
    */

    if (!png_get_gAMA(png, info, &gamma)) {
        gamma = 1.0;
    }

    /* we're not displaying but converting, screen gamma == 1.0 */
    png_set_gamma(png, 1.0, gamma);

    png_read_update_info(png, info);

    color_type = png_get_color_type(png, info);

    switch (color_type) {
    case PNG_COLOR_TYPE_GRAY:
        nr_comp = 1;
        break;
    case PNG_COLOR_TYPE_GRAY_ALPHA:
        nr_comp = 2;
        break;
    case PNG_COLOR_TYPE_RGB:
        nr_comp = 3;
        break;
    case PNG_COLOR_TYPE_RGB_ALPHA:
        nr_comp = 4;
        break;
    default:
        fprintf(stderr, "pngtoimage: colortype %d is not supported\n", color_type);
        goto fin;
    }
    cvtCxToPx = convert_32s_CXPX_LUT[nr_comp];
    bit_depth = png_get_bit_depth(png, info);

    switch (bit_depth) {
    case 1:
    case 2:
    case 4:
    case 8:
        cvtXXTo32s = convert_XXu32s_C1R_LUT[bit_depth];
        break;
    case 16: /* 16 bpp is specific to PNG */
        cvtXXTo32s = convert_16u32s_C1R;
        break;
    default:
        fprintf(stderr, "pngtoimage: bit depth %d is not supported\n", bit_depth);
        goto fin;
    }


    rows = (OPJ_BYTE**)calloc(height + 1, sizeof(OPJ_BYTE*));
    if (rows == NULL) {
        fprintf(stderr, "pngtoimage: memory out\n");
        goto fin;
    }
    for (i = 0; i < height; ++i) {
        rows[i] = (OPJ_BYTE*)malloc(png_get_rowbytes(png, info));
        if (rows[i] == NULL) {
            fprintf(stderr, "pngtoimage: memory out\n");
            goto fin;
        }
    }
    png_read_image(png, rows);

    /* Create image */
    memset(cmptparm, 0, sizeof(cmptparm));
    for (i = 0; i < nr_comp; ++i) {
        cmptparm[i].prec = (OPJ_UINT32)bit_depth;
        /* bits_per_pixel: 8 or 16 */
        cmptparm[i].bpp = (OPJ_UINT32)bit_depth;
        cmptparm[i].sgnd = 0;
        cmptparm[i].dx = (OPJ_UINT32)params->subsampling_dx;
        cmptparm[i].dy = (OPJ_UINT32)params->subsampling_dy;
        cmptparm[i].w = (OPJ_UINT32)width;
        cmptparm[i].h = (OPJ_UINT32)height;
    }

    image = opj_image_create(nr_comp, &cmptparm[0],
                             (nr_comp > 2U) ? OPJ_CLRSPC_SRGB : OPJ_CLRSPC_GRAY);
    if (image == NULL) {
        goto fin;
    }
    image->x0 = (OPJ_UINT32)params->image_offset_x0;
    image->y0 = (OPJ_UINT32)params->image_offset_y0;
    image->x1 = (OPJ_UINT32)(image->x0 + (width  - 1) * (OPJ_UINT32)
                             params->subsampling_dx + 1);
    image->y1 = (OPJ_UINT32)(image->y0 + (height - 1) * (OPJ_UINT32)
                             params->subsampling_dy + 1);

    row32s = (OPJ_INT32 *)malloc((size_t)width * nr_comp * sizeof(OPJ_INT32));
    if (row32s == NULL) {
        goto fin;
    }

    /* Set alpha channel */
    image->comps[nr_comp - 1U].alpha = 1U - (nr_comp & 1U);

    for (i = 0; i < nr_comp; i++) {
        planes[i] = image->comps[i].data;
    }

    for (i = 0; i < height; ++i) {
        cvtXXTo32s(rows[i], row32s, (OPJ_SIZE_T)width * nr_comp);
        cvtCxToPx(row32s, planes, width);
        planes[0] += width;
        planes[1] += width;
        planes[2] += width;
        planes[3] += width;
    }
fin:
    if (rows) {
        for (i = 0; i < height; ++i)
            if (rows[i]) {
                free(rows[i]);
            }
        free(rows);
    }
    if (row32s) {
        free(row32s);
    }
    if (png) {
        png_destroy_read_struct(&png, &info, NULL);
    }

    fclose(reader);

    return image;

}/* pngtoimage() */


static void convert_32s16u_C1R(const OPJ_INT32* pSrc, OPJ_BYTE* pDst,
                               OPJ_SIZE_T length)
{
    OPJ_SIZE_T i;
    for (i = 0; i < length; i++) {
        OPJ_UINT32 val = (OPJ_UINT32)pSrc[i];
        *pDst++ = (OPJ_BYTE)(val >> 8);
        *pDst++ = (OPJ_BYTE)val;
    }
}
int imagetopng(opj_image_t * image, const char *write_idf)
{
    FILE * volatile writer = NULL;
    png_structp png = NULL;
    png_infop info = NULL;
    png_bytep volatile row_buf = NULL;
    int nr_comp, color_type;
    volatile int prec;
    png_color_8 sig_bit;
    OPJ_INT32 const* planes[4];
    int i;
    OPJ_INT32* volatile buffer32s = NULL;

    volatile int fails = 1;

    memset(&sig_bit, 0, sizeof(sig_bit));
    prec = (int)image->comps[0].prec;
    planes[0] = image->comps[0].data;
    if (planes[0] == NULL) {
        fprintf(stderr,
                "imagetopng: planes[%d] == NULL.\n", 0);
        fprintf(stderr, "\tAborting\n");
        return 1;
    }
    nr_comp = (int)image->numcomps;

    if (nr_comp > 4) {
        nr_comp = 4;
    }
    for (i = 1; i < nr_comp; ++i) {
        if (image->comps[0].dx != image->comps[i].dx) {
            break;
        }
        if (image->comps[0].dy != image->comps[i].dy) {
            break;
        }
        if (image->comps[0].prec != image->comps[i].prec) {
            break;
        }
        if (image->comps[0].sgnd != image->comps[i].sgnd) {
            break;
        }
        planes[i] = image->comps[i].data;
        if (planes[i] == NULL) {
            fprintf(stderr,
                    "imagetopng: planes[%d] == NULL.\n", i);
            fprintf(stderr, "\tAborting\n");
            return 1;
        }
    }
    if (i != nr_comp) {
        fprintf(stderr,
                "imagetopng: All components shall have the same subsampling, same bit depth, same sign.\n");
        fprintf(stderr, "\tAborting\n");
        return 1;
    }
    for (i = 0; i < nr_comp; ++i) {
        clip_component(&(image->comps[i]), image->comps[0].prec);
    }
    if (prec > 8 && prec < 16) {
        for (i = 0; i < nr_comp; ++i) {
            scale_component(&(image->comps[i]), 16);
        }
        prec = 16;
    } else if (prec < 8 && nr_comp > 1) { /* GRAY_ALPHA, RGB, RGB_ALPHA */
        for (i = 0; i < nr_comp; ++i) {
            scale_component(&(image->comps[i]), 8);
        }
        prec = 8;
    } else if ((prec > 1) && (prec < 8) && ((prec == 6) ||
                                            ((prec & 1) == 1))) { /* GRAY with non native precision */
        if ((prec == 5) || (prec == 6)) {
            prec = 8;
        } else {
            prec++;
        }
        for (i = 0; i < nr_comp; ++i) {
            scale_component(&(image->comps[i]), (OPJ_UINT32)prec);
        }
    }

    if (prec != 1 && prec != 2 && prec != 4 && prec != 8 && prec != 16) {
        fprintf(stderr, "imagetopng: can not create %s\n\twrong bit_depth %d\n",
                write_idf, prec);
        return fails;
    }

    writer = fopen(write_idf, "wb");

    if (writer == NULL) {
        return fails;
    }

    /* Create and initialize the png_struct with the desired error handler
     * functions.  If you want to use the default stderr and longjump method,
     * you can supply NULL for the last three parameters.  We also check that
     * the library version is compatible with the one used at compile time,
     * in case we are using dynamically linked libraries.  REQUIRED.
     */
    png = png_create_write_struct(PNG_LIBPNG_VER_STRING,
                                  NULL, NULL, NULL);
    /*png_voidp user_error_ptr, user_error_fn, user_warning_fn); */

    if (png == NULL) {
        goto fin;
    }

    /* Allocate/initialize the image information data.  REQUIRED
     */
    info = png_create_info_struct(png);

    if (info == NULL) {
        goto fin;
    }

    /* Set error handling.  REQUIRED if you are not supplying your own
     * error handling functions in the png_create_write_struct() call.
     */
    if (setjmp(png_jmpbuf(png))) {
        goto fin;
    }

    /* I/O initialization functions is REQUIRED
     */
    png_init_io(png, writer);

    /* Set the image information here.  Width and height are up to 2^31,
     * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
     * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
     * PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
     * or PNG_COLOR_TYPE_RGB_ALPHA.  interlace is either PNG_INTERLACE_NONE or
     * PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
     * currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE.
     * REQUIRED
     *
     * ERRORS:
     *
     * color_type == PNG_COLOR_TYPE_PALETTE && bit_depth > 8
     * color_type == PNG_COLOR_TYPE_RGB && bit_depth < 8
     * color_type == PNG_COLOR_TYPE_GRAY_ALPHA && bit_depth < 8
     * color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8
     *
     */
    png_set_compression_level(png, Z_BEST_COMPRESSION);

    if (nr_comp >= 3) { /* RGB(A) */
        color_type = PNG_COLOR_TYPE_RGB;
        sig_bit.red = sig_bit.green = sig_bit.blue = (png_byte)prec;
    } else { /* GRAY(A) */
        color_type = PNG_COLOR_TYPE_GRAY;
        sig_bit.gray = (png_byte)prec;
    }
    if ((nr_comp & 1) == 0) { /* ALPHA */
        color_type |= PNG_COLOR_MASK_ALPHA;
        sig_bit.alpha = (png_byte)prec;
    }

    png_set_IHDR(png, info, image->comps[0].w, image->comps[0].h, prec, color_type,
                 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,  PNG_FILTER_TYPE_BASE);

    png_set_sBIT(png, info, &sig_bit);
    /* png_set_gamma(png, 2.2, 1./2.2); */
    /* png_set_sRGB(png, info, PNG_sRGB_INTENT_PERCEPTUAL); */
    png_write_info(png, info);

    /* setup conversion */
    {
        OPJ_SIZE_T rowStride;
        png_size_t png_row_size;

        png_row_size = png_get_rowbytes(png, info);
        rowStride = ((OPJ_SIZE_T)image->comps[0].w * (OPJ_SIZE_T)nr_comp *
                     (OPJ_SIZE_T)prec + 7U) / 8U;
        if (rowStride != (OPJ_SIZE_T)png_row_size) {
            fprintf(stderr, "Invalid PNG row size\n");
            goto fin;
        }
        row_buf = (png_bytep)malloc(png_row_size);
        if (row_buf == NULL) {
            fprintf(stderr, "Can't allocate memory for PNG row\n");
            goto fin;
        }
        buffer32s = (OPJ_INT32*)malloc((OPJ_SIZE_T)image->comps[0].w *
                                       (OPJ_SIZE_T)nr_comp * sizeof(OPJ_INT32));
        if (buffer32s == NULL) {
            fprintf(stderr, "Can't allocate memory for interleaved 32s row\n");
            goto fin;
        }
    }

    /* convert */
    {
        OPJ_SIZE_T width = image->comps[0].w;
        OPJ_UINT32 y;
        convert_32s_PXCX cvtPxToCx = convert_32s_PXCX_LUT[nr_comp];
        convert_32sXXx_C1R cvt32sToPack = NULL;
        OPJ_INT32 adjust = image->comps[0].sgnd ? 1 << (prec - 1) : 0;
        png_bytep row_buf_cpy = row_buf;
        OPJ_INT32* buffer32s_cpy = buffer32s;

        switch (prec) {
        case 1:
        case 2:
        case 4:
        case 8:
            cvt32sToPack = convert_32sXXu_C1R_LUT[prec];
            break;
        case 16:
            cvt32sToPack = convert_32s16u_C1R;
            break;
        default:
            /* never here */
            break;
        }

        for (y = 0; y < image->comps[0].h; ++y) {
            cvtPxToCx(planes, buffer32s_cpy, width, adjust);
            cvt32sToPack(buffer32s_cpy, row_buf_cpy, width * (OPJ_SIZE_T)nr_comp);
            png_write_row(png, row_buf_cpy);
            planes[0] += width;
            planes[1] += width;
            planes[2] += width;
            planes[3] += width;
        }
    }

    png_write_end(png, info);

    fails = 0;

fin:
    if (png) {
        png_destroy_write_struct(&png, &info);
    }
    if (row_buf) {
        free(row_buf);
    }
    if (buffer32s) {
        free(buffer32s);
    }
    fclose(writer);

    if (fails) {
        (void)remove(write_idf);    /* ignore return value */
    }

    return fails;
}/* imagetopng() */