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convert.c

/*
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
 * Copyright (c) 2005, Hervé 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "openjpeg.h"

/*
 * Get logarithm of an integer and round downwards.
 *
 * log2(a)
 */
static int int_floorlog2(int a) {
      int l;
      for (l = 0; a > 1; l++) {
            a >>= 1;
      }
      return l;
}

/*
 * Divide an integer by a power of 2 and round upwards.
 *
 * a divided by 2^b
 */
static int int_ceildivpow2(int a, int b) {
      return (a + (1 << b) - 1) >> b;
}

/*
 * Divide an integer and round upwards.
 *
 * a divided by b
 */
static int int_ceildiv(int a, int b) {
      return (a + b - 1) / b;
}

/* -->> -->> -->> -->>

  BMP IMAGE FORMAT

 <<-- <<-- <<-- <<-- */

/* WORD defines a two byte word */
typedef unsigned short int WORD;

/* DWORD defines a four byte word */
typedef unsigned long int DWORD;

typedef struct {
  WORD bfType;                /* 'BM' for Bitmap (19776) */
  DWORD bfSize;               /* Size of the file        */
  WORD bfReserved1;           /* Reserved : 0            */
  WORD bfReserved2;           /* Reserved : 0            */
  DWORD bfOffBits;            /* Offset                  */
} BITMAPFILEHEADER_t;

typedef struct {
  DWORD biSize;               /* Size of the structure in bytes */
  DWORD biWidth;        /* Width of the image in pixels */
  DWORD biHeight;       /* Heigth of the image in pixels */
  WORD biPlanes;        /* 1 */
  WORD biBitCount;            /* Number of color bits by pixels */
  DWORD biCompression;        /* Type of encoding 0: none 1: RLE8 2: RLE4 */
  DWORD biSizeImage;          /* Size of the image in bytes */
  DWORD biXpelsPerMeter;      /* Horizontal (X) resolution in pixels/meter */
  DWORD biYpelsPerMeter;      /* Vertical (Y) resolution in pixels/meter */
  DWORD biClrUsed;            /* Number of color used in the image (0: ALL) */
  DWORD biClrImportant;       /* Number of important color (0: ALL) */
} BITMAPINFOHEADER_t;

opj_image_t* bmptoimage(char *filename, opj_cparameters_t *parameters) {
      int subsampling_dx = parameters->subsampling_dx;
      int subsampling_dy = parameters->subsampling_dy;

      int i, numcomps, w, h;
      OPJ_COLOR_SPACE color_space;
      opj_image_cmptparm_t cmptparm[3];   /* maximum of 3 components */
      opj_image_t * image = NULL;

      FILE *IN;
      BITMAPFILEHEADER_t File_h;
      BITMAPINFOHEADER_t Info_h;
      unsigned char *RGB;
      unsigned char *table_R, *table_G, *table_B;
      unsigned int j, PAD = 0;

      int x, y, index;
      int gray_scale = 1, not_end_file = 1; 

      unsigned int line = 0, col = 0;
      unsigned char v, v2;
      DWORD W, H;
  
      IN = fopen(filename, "rb");
      if (!IN) {
            fprintf(stderr, "\033[0;33mFailed to open %s for reading !!\033[0;39m\n", filename);
            return 0;
      }
      
      File_h.bfType = getc(IN);
      File_h.bfType = (getc(IN) << 8) + File_h.bfType;
      
      if (File_h.bfType != 19778) {
            fprintf(stderr,"Error, not a BMP file!\n");
            return 0;
      } else {
            /* FILE HEADER */
            /* ------------- */
            File_h.bfSize = getc(IN);
            File_h.bfSize = (getc(IN) << 8) + File_h.bfSize;
            File_h.bfSize = (getc(IN) << 16) + File_h.bfSize;
            File_h.bfSize = (getc(IN) << 24) + File_h.bfSize;

            File_h.bfReserved1 = getc(IN);
            File_h.bfReserved1 = (getc(IN) << 8) + File_h.bfReserved1;

            File_h.bfReserved2 = getc(IN);
            File_h.bfReserved2 = (getc(IN) << 8) + File_h.bfReserved2;

            File_h.bfOffBits = getc(IN);
            File_h.bfOffBits = (getc(IN) << 8) + File_h.bfOffBits;
            File_h.bfOffBits = (getc(IN) << 16) + File_h.bfOffBits;
            File_h.bfOffBits = (getc(IN) << 24) + File_h.bfOffBits;

            /* INFO HEADER */
            /* ------------- */

            Info_h.biSize = getc(IN);
            Info_h.biSize = (getc(IN) << 8) + Info_h.biSize;
            Info_h.biSize = (getc(IN) << 16) + Info_h.biSize;
            Info_h.biSize = (getc(IN) << 24) + Info_h.biSize;

            Info_h.biWidth = getc(IN);
            Info_h.biWidth = (getc(IN) << 8) + Info_h.biWidth;
            Info_h.biWidth = (getc(IN) << 16) + Info_h.biWidth;
            Info_h.biWidth = (getc(IN) << 24) + Info_h.biWidth;
            w = Info_h.biWidth;

            Info_h.biHeight = getc(IN);
            Info_h.biHeight = (getc(IN) << 8) + Info_h.biHeight;
            Info_h.biHeight = (getc(IN) << 16) + Info_h.biHeight;
            Info_h.biHeight = (getc(IN) << 24) + Info_h.biHeight;
            h = Info_h.biHeight;

            Info_h.biPlanes = getc(IN);
            Info_h.biPlanes = (getc(IN) << 8) + Info_h.biPlanes;

            Info_h.biBitCount = getc(IN);
            Info_h.biBitCount = (getc(IN) << 8) + Info_h.biBitCount;

            Info_h.biCompression = getc(IN);
            Info_h.biCompression = (getc(IN) << 8) + Info_h.biCompression;
            Info_h.biCompression = (getc(IN) << 16) + Info_h.biCompression;
            Info_h.biCompression = (getc(IN) << 24) + Info_h.biCompression;

            Info_h.biSizeImage = getc(IN);
            Info_h.biSizeImage = (getc(IN) << 8) + Info_h.biSizeImage;
            Info_h.biSizeImage = (getc(IN) << 16) + Info_h.biSizeImage;
            Info_h.biSizeImage = (getc(IN) << 24) + Info_h.biSizeImage;

            Info_h.biXpelsPerMeter = getc(IN);
            Info_h.biXpelsPerMeter = (getc(IN) << 8) + Info_h.biXpelsPerMeter;
            Info_h.biXpelsPerMeter = (getc(IN) << 16) + Info_h.biXpelsPerMeter;
            Info_h.biXpelsPerMeter = (getc(IN) << 24) + Info_h.biXpelsPerMeter;

            Info_h.biYpelsPerMeter = getc(IN);
            Info_h.biYpelsPerMeter = (getc(IN) << 8) + Info_h.biYpelsPerMeter;
            Info_h.biYpelsPerMeter = (getc(IN) << 16) + Info_h.biYpelsPerMeter;
            Info_h.biYpelsPerMeter = (getc(IN) << 24) + Info_h.biYpelsPerMeter;

            Info_h.biClrUsed = getc(IN);
            Info_h.biClrUsed = (getc(IN) << 8) + Info_h.biClrUsed;
            Info_h.biClrUsed = (getc(IN) << 16) + Info_h.biClrUsed;
            Info_h.biClrUsed = (getc(IN) << 24) + Info_h.biClrUsed;

            Info_h.biClrImportant = getc(IN);
            Info_h.biClrImportant = (getc(IN) << 8) + Info_h.biClrImportant;
            Info_h.biClrImportant = (getc(IN) << 16) + Info_h.biClrImportant;
            Info_h.biClrImportant = (getc(IN) << 24) + Info_h.biClrImportant;

            /* Read the data and store them in the OUT file */
    
            if (Info_h.biBitCount == 24) {
                  numcomps = 3;
                  color_space = CLRSPC_SRGB;
                  /* initialize image components */
                  memset(&cmptparm[0], 0, 3 * sizeof(opj_image_cmptparm_t));
                  for(i = 0; i < numcomps; i++) {
                        cmptparm[i].prec = 8;
                        cmptparm[i].bpp = 8;
                        cmptparm[i].sgnd = 0;
                        cmptparm[i].dx = subsampling_dx;
                        cmptparm[i].dy = subsampling_dy;
                        cmptparm[i].w = w;
                        cmptparm[i].h = h;
                  }
                  /* create the image */
                  image = opj_image_create(numcomps, &cmptparm[0], color_space);
                  if(!image) {
                        fclose(IN);
                        return NULL;
                  }

                  /* set image offset and reference grid */
                  image->x0 = parameters->image_offset_x0;
                  image->y0 = parameters->image_offset_y0;
                  image->x1 = !image->x0 ? (w - 1) * subsampling_dx + 1 : image->x0 + (w - 1) * subsampling_dx + 1;
                  image->y1 = !image->y0 ? (h - 1) * subsampling_dy + 1 : image->y0 + (h - 1) * subsampling_dy + 1;

                  /* set image data */

                  /* Place the cursor at the beginning of the image information */
                  fseek(IN, 0, SEEK_SET);
                  fseek(IN, File_h.bfOffBits, SEEK_SET);
                  
                  W = Info_h.biWidth;
                  H = Info_h.biHeight;

                  /* PAD = 4 - (3 * W) % 4; */
                  /* PAD = (PAD == 4) ? 0 : PAD; */
                  PAD = (3 * W) % 4 ? 4 - (3 * W) % 4 : 0;
                  
                  RGB = (unsigned char *) malloc((3 * W + PAD) * H * sizeof(unsigned char));
                  
                  fread(RGB, sizeof(unsigned char), (3 * W + PAD) * H, IN);
                  
                  index = 0;

                  for(y = 0; y < (int)H; y++) {
                        unsigned char *scanline = RGB + (3 * W + PAD) * (H - 1 - y);
                        for(x = 0; x < (int)W; x++) {
                              unsigned char *pixel = &scanline[3 * x];
                              image->comps[0].data[index] = pixel[2];   /* R */
                              image->comps[1].data[index] = pixel[1];   /* G */
                              image->comps[2].data[index] = pixel[0];   /* B */
                              index++;
                        }
                  }

                  free(RGB);

            } else if (Info_h.biBitCount == 8 && Info_h.biCompression == 0) {
                  table_R = (unsigned char *) malloc(256 * sizeof(unsigned char));
                  table_G = (unsigned char *) malloc(256 * sizeof(unsigned char));
                  table_B = (unsigned char *) malloc(256 * sizeof(unsigned char));
                  
                  for (j = 0; j < Info_h.biClrUsed; j++) {
                        table_B[j] = getc(IN);
                        table_G[j] = getc(IN);
                        table_R[j] = getc(IN);
                        getc(IN);
                        if (table_R[j] != table_G[j] && table_R[j] != table_B[j] && table_G[j] != table_B[j])
                              gray_scale = 0;
                  }
                  
                  /* Place the cursor at the beginning of the image information */
                  fseek(IN, 0, SEEK_SET);
                  fseek(IN, File_h.bfOffBits, SEEK_SET);
                  
                  W = Info_h.biWidth;
                  H = Info_h.biHeight;
                  if (Info_h.biWidth % 2)
                        W++;
                  
                  numcomps = gray_scale ? 1 : 3;
                  color_space = gray_scale ? CLRSPC_GRAY : CLRSPC_SRGB;
                  /* initialize image components */
                  memset(&cmptparm[0], 0, 3 * sizeof(opj_image_cmptparm_t));
                  for(i = 0; i < numcomps; i++) {
                        cmptparm[i].prec = 8;
                        cmptparm[i].bpp = 8;
                        cmptparm[i].sgnd = 0;
                        cmptparm[i].dx = subsampling_dx;
                        cmptparm[i].dy = subsampling_dy;
                        cmptparm[i].w = w;
                        cmptparm[i].h = h;
                  }
                  /* create the image */
                  image = opj_image_create(numcomps, &cmptparm[0], color_space);
                  if(!image) {
                        fclose(IN);
                        return NULL;
                  }

                  /* set image offset and reference grid */
                  image->x0 = parameters->image_offset_x0;
                  image->y0 = parameters->image_offset_y0;
                  image->x1 = !image->x0 ? (w - 1) * subsampling_dx + 1 : image->x0 + (w - 1) * subsampling_dx + 1;
                  image->y1 = !image->y0 ? (h - 1) * subsampling_dy + 1 : image->y0 + (h - 1) * subsampling_dy + 1;

                  /* set image data */

                  RGB = (unsigned char *) malloc(W * H * sizeof(unsigned char));
                  
                  fread(RGB, sizeof(unsigned char), W * H, IN);
                  if (gray_scale) {
                        index = 0;
                        for (j = 0; j < W * H; j++) {
                              if ((j % W < W - 1 && Info_h.biWidth % 2) || !(Info_h.biWidth % 2)) {
                                    image->comps[0].data[index] = table_R[RGB[W * H - ((j) / (W) + 1) * W + (j) % (W)]];
                                    index++;
                              }
                        }

                  } else {          
                        index = 0;
                        for (j = 0; j < W * H; j++) {
                              if ((j % W < W - 1 && Info_h.biWidth % 2) || !(Info_h.biWidth % 2)) {
                                    unsigned char pixel_index = RGB[W * H - ((j) / (W) + 1) * W + (j) % (W)];
                                    image->comps[0].data[index] = table_R[pixel_index];
                                    image->comps[1].data[index] = table_G[pixel_index];
                                    image->comps[2].data[index] = table_B[pixel_index];
                                    index++;
                              }
                        }
                  }
                  free(RGB);
            
            } else if (Info_h.biBitCount == 8 && Info_h.biCompression == 1) {                   
                  table_R = (unsigned char *) malloc(256 * sizeof(unsigned char));
                  table_G = (unsigned char *) malloc(256 * sizeof(unsigned char));
                  table_B = (unsigned char *) malloc(256 * sizeof(unsigned char));
                  
                  for (j = 0; j < Info_h.biClrUsed; j++) {
                        table_B[j] = getc(IN);
                        table_G[j] = getc(IN);
                        table_R[j] = getc(IN);
                        getc(IN);
                        if (table_R[j] != table_G[j] && table_R[j] != table_B[j] && table_G[j] != table_B[j])
                              gray_scale = 0;
                  }

                  numcomps = gray_scale ? 1 : 3;
                  color_space = gray_scale ? CLRSPC_GRAY : CLRSPC_SRGB;
                  /* initialize image components */
                  memset(&cmptparm[0], 0, 3 * sizeof(opj_image_cmptparm_t));
                  for(i = 0; i < numcomps; i++) {
                        cmptparm[i].prec = 8;
                        cmptparm[i].bpp = 8;
                        cmptparm[i].sgnd = 0;
                        cmptparm[i].dx = subsampling_dx;
                        cmptparm[i].dy = subsampling_dy;
                        cmptparm[i].w = w;
                        cmptparm[i].h = h;
                  }
                  /* create the image */
                  image = opj_image_create(numcomps, &cmptparm[0], color_space);
                  if(!image) {
                        fclose(IN);
                        return NULL;
                  }

                  /* set image offset and reference grid */
                  image->x0 = parameters->image_offset_x0;
                  image->y0 = parameters->image_offset_y0;
                  image->x1 = !image->x0 ? (w - 1) * subsampling_dx + 1 : image->x0 + (w - 1) * subsampling_dx + 1;
                  image->y1 = !image->y0 ? (h - 1) * subsampling_dy + 1 : image->y0 + (h - 1) * subsampling_dy + 1;

                  /* set image data */
                  
                  /* Place the cursor at the beginning of the image information */
                  fseek(IN, 0, SEEK_SET);
                  fseek(IN, File_h.bfOffBits, SEEK_SET);
                  
                  RGB = (unsigned char *) malloc(Info_h.biWidth * Info_h.biHeight * sizeof(unsigned char));
            
                  while (not_end_file) {
                        v = getc(IN);
                        if (v) {
                              v2 = getc(IN);
                              for (i = 0; i < (int) v; i++) {
                                    RGB[line * Info_h.biWidth + col] = v2;
                                    col++;
                              }
                        } else {
                              v = getc(IN);
                              switch (v) {
                                    case 0:
                                          col = 0;
                                          line++;
                                          break;
                                    case 1:
                                          line++;
                                          not_end_file = 0;
                                          break;
                                    case 2:
                                          fprintf(stderr,"No Delta supported\n");
                                          opj_image_destroy(image);
                                          fclose(IN);
                                          return NULL;
                                    default:
                                          for (i = 0; i < v; i++) {
                                                v2 = getc(IN);
                                                RGB[line * Info_h.biWidth + col] = v2;
                                                col++;
                                          }
                                          if (v % 2)
                                                v2 = getc(IN);
                                          break;
                              }
                        }
                  }
                  if (gray_scale) {
                        index = 0;
                        for (line = 0; line < Info_h.biHeight; line++) {
                              for (col = 0; col < Info_h.biWidth; col++) {
                                    image->comps[0].data[index] = table_R[(int)RGB[(Info_h.biHeight - line - 1) * Info_h.biWidth + col]];
                                    index++;
                              }
                        }
                  } else {
                        index = 0;
                        for (line = 0; line < Info_h.biHeight; line++) {
                              for (col = 0; col < Info_h.biWidth; col++) {
                                    unsigned char pixel_index = (int)RGB[(Info_h.biHeight - line - 1) * Info_h.biWidth + col];
                                    image->comps[0].data[index] = table_R[pixel_index];
                                    image->comps[1].data[index] = table_G[pixel_index];
                                    image->comps[2].data[index] = table_B[pixel_index];
                                    index++;
                              }
                        }
                  }
                  free(RGB);
      } else {
            fprintf(stderr, 
                  "Other system than 24 bits/pixels or 8 bits (no RLE coding) is not yet implemented [%d]\n", Info_h.biBitCount);
      }
      fclose(IN);
 }
 
 return image;
}

int imagetobmp(opj_image_t * image, char *outfile) {
      int w, wr, h, hr;
      int i, pad;
      FILE *fdest = NULL;

      if (image->numcomps == 3 && image->comps[0].dx == image->comps[1].dx
            && image->comps[1].dx == image->comps[2].dx
            && image->comps[0].dy == image->comps[1].dy
            && image->comps[1].dy == image->comps[2].dy
            && image->comps[0].prec == image->comps[1].prec
            && image->comps[1].prec == image->comps[2].prec) {
            
            /* -->> -->> -->> -->>    
            24 bits color         
            <<-- <<-- <<-- <<-- */
          
            fdest = fopen(outfile, "wb");
            if (!fdest) {
                  fprintf(stderr, "ERROR -> failed to open %s for writing\n", outfile);
                  return 1;
            }
          
            /* w = int_ceildiv(image->x1 - image->x0, image->comps[0].dx); */
            /* wr = int_ceildiv(int_ceildivpow2(image->x1 - image->x0,image->factor), image->comps[0].dx); */
            w = image->comps[0].w;
            wr = int_ceildivpow2(image->comps[0].w, image->comps[0].factor);
          
            /* h = int_ceildiv(image->y1 - image->y0, image->comps[0].dy); */
            /* hr = int_ceildiv(int_ceildivpow2(image->y1 - image->y0,image->factor), image->comps[0].dy); */
            h = image->comps[0].h;
            hr = int_ceildivpow2(image->comps[0].h, image->comps[0].factor);
          
            fprintf(fdest, "BM");
          
            /* FILE HEADER */
            /* ------------- */
            fprintf(fdest, "%c%c%c%c",
                  (unsigned char) (hr * wr * 3 + 3 * hr * (wr % 2) + 54) & 0xff,
                  (unsigned char) ((hr * wr * 3 + 3 * hr * (wr % 2) + 54)     >> 8) & 0xff,
                  (unsigned char) ((hr * wr * 3 + 3 * hr * (wr % 2) + 54)     >> 16) & 0xff,
                  (unsigned char) ((hr * wr * 3 + 3 * hr * (wr % 2) + 54)     >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (0) & 0xff, ((0) >> 8) & 0xff, ((0) >> 16) & 0xff, ((0) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (54) & 0xff, ((54) >> 8) & 0xff,((54) >> 16) & 0xff, ((54) >> 24) & 0xff);
          
            /* INFO HEADER   */
            /* ------------- */
            fprintf(fdest, "%c%c%c%c", (40) & 0xff, ((40) >> 8) & 0xff, ((40) >> 16) & 0xff, ((40) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (unsigned char) ((wr) & 0xff),
                  (unsigned char) ((wr) >> 8) & 0xff,
                  (unsigned char) ((wr) >> 16) & 0xff,
                  (unsigned char) ((wr) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (unsigned char) ((hr) & 0xff),
                  (unsigned char) ((hr) >> 8) & 0xff,
                  (unsigned char) ((hr) >> 16) & 0xff,
                  (unsigned char) ((hr) >> 24) & 0xff);
            fprintf(fdest, "%c%c", (1) & 0xff, ((1) >> 8) & 0xff);
            fprintf(fdest, "%c%c", (24) & 0xff, ((24) >> 8) & 0xff);
            fprintf(fdest, "%c%c%c%c", (0) & 0xff, ((0) >> 8) & 0xff, ((0) >> 16) & 0xff, ((0) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (unsigned char) (3 * hr * wr + 3 * hr * (wr % 2)) & 0xff,
                  (unsigned char) ((hr * wr * 3 + 3 * hr * (wr % 2)) >> 8) & 0xff,
                  (unsigned char) ((hr * wr * 3 + 3 * hr * (wr % 2)) >> 16) & 0xff,
                  (unsigned char) ((hr * wr * 3 + 3 * hr * (wr % 2)) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (7834) & 0xff, ((7834) >> 8) & 0xff, ((7834) >> 16) & 0xff, ((7834) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (7834) & 0xff, ((7834) >> 8) & 0xff,   ((7834) >> 16) & 0xff, ((7834) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (0) & 0xff, ((0) >> 8) & 0xff, ((0) >> 16) & 0xff, ((0) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (0) & 0xff, ((0) >> 8) & 0xff, ((0) >> 16) & 0xff, ((0) >> 24) & 0xff);
          
            for (i = 0; i < wr * hr; i++) {
                  unsigned char R, G, B;
                  /* a modifier */
                  /* R = image->comps[0].data[w * h - ((i) / (w) + 1) * w + (i) % (w)]; */
                  R = image->comps[0].data[w * hr - ((i) / (wr) + 1) * w + (i) % (wr)];
                  /* G = image->comps[1].data[w * h - ((i) / (w) + 1) * w + (i) % (w)]; */
                  G = image->comps[1].data[w * hr - ((i) / (wr) + 1) * w + (i) % (wr)];
                  /* B = image->comps[2].data[w * h - ((i) / (w) + 1) * w + (i) % (w)]; */
                  B = image->comps[2].data[w * hr - ((i) / (wr) + 1) * w + (i) % (wr)];
                  fprintf(fdest, "%c%c%c", B, G, R);
                  
                  if ((i + 1) % wr == 0) {
                        for (pad = (3 * wr) % 4 ? 4 - (3 * wr) % 4 : 0; pad > 0; pad--)   /* ADD */
                              fprintf(fdest, "%c", 0);
                  }
            }
            fclose(fdest);
      } else {                /* Gray-scale */

            /* -->> -->> -->> -->>
            8 bits non code (Gray scale)
            <<-- <<-- <<-- <<-- */

            fdest = fopen(outfile, "wb");
            /* w = int_ceildiv(image->x1 - image->x0, image->comps[0].dx); */
            /* wr = int_ceildiv(int_ceildivpow2(image->x1 - image->x0,image->factor), image->comps[0].dx); */
            w = image->comps[0].w;
            wr = int_ceildivpow2(image->comps[0].w, image->comps[0].factor);
          
            /* h = int_ceildiv(image->y1 - image->y0, image->comps[0].dy); */
            /* hr = int_ceildiv(int_ceildivpow2(image->y1 - image->y0,image->factor), image->comps[0].dy); */
            h = image->comps[0].h;
            hr = int_ceildivpow2(image->comps[0].h, image->comps[0].factor);
          
            fprintf(fdest, "BM");
          
            /* FILE HEADER */
            /* ------------- */
            fprintf(fdest, "%c%c%c%c", (unsigned char) (hr * wr + 54 + 1024 + hr * (wr % 2)) & 0xff,
                  (unsigned char) ((hr * wr + 54 + 1024 + hr * (wr % 2)) >> 8) & 0xff,
                  (unsigned char) ((hr * wr + 54 + 1024 + hr * (wr % 2)) >> 16) & 0xff,
                  (unsigned char) ((hr * wr + 54 + 1024 + wr * (wr % 2)) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (0) & 0xff, ((0) >> 8) & 0xff, ((0) >> 16) & 0xff, ((0) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (54 + 1024) & 0xff, ((54 + 1024) >> 8) & 0xff, 
                  ((54 + 1024) >> 16) & 0xff,
                  ((54 + 1024) >> 24) & 0xff);
          
            /* INFO HEADER */
            /* ------------- */
            fprintf(fdest, "%c%c%c%c", (40) & 0xff, ((40) >> 8) & 0xff, ((40) >> 16) & 0xff, ((40) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (unsigned char) ((wr) & 0xff),
                  (unsigned char) ((wr) >> 8) & 0xff,
                  (unsigned char) ((wr) >> 16) & 0xff,
                  (unsigned char) ((wr) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (unsigned char) ((hr) & 0xff),
                  (unsigned char) ((hr) >> 8) & 0xff,
                  (unsigned char) ((hr) >> 16) & 0xff,
                  (unsigned char) ((hr) >> 24) & 0xff);
            fprintf(fdest, "%c%c", (1) & 0xff, ((1) >> 8) & 0xff);
            fprintf(fdest, "%c%c", (8) & 0xff, ((8) >> 8) & 0xff);
            fprintf(fdest, "%c%c%c%c", (0) & 0xff, ((0) >> 8) & 0xff, ((0) >> 16) & 0xff, ((0) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (unsigned char) (hr * wr + hr * (wr % 2)) & 0xff,
                  (unsigned char) ((hr * wr + hr * (wr % 2)) >> 8) &    0xff,
                  (unsigned char) ((hr * wr + hr * (wr % 2)) >> 16) &   0xff,
                  (unsigned char) ((hr * wr + hr * (wr % 2)) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (7834) & 0xff, ((7834) >> 8) & 0xff,   ((7834) >> 16) & 0xff, ((7834) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (7834) & 0xff, ((7834) >> 8) & 0xff,   ((7834) >> 16) & 0xff, ((7834) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (256) & 0xff, ((256) >> 8) & 0xff, ((256) >> 16) & 0xff, ((256) >> 24) & 0xff);
            fprintf(fdest, "%c%c%c%c", (256) & 0xff, ((256) >> 8) & 0xff, ((256) >> 16) & 0xff, ((256) >> 24) & 0xff);

            for (i = 0; i < 256; i++) {
                  fprintf(fdest, "%c%c%c%c", i, i, i, 0);
            }

            for (i = 0; i < wr * hr; i++) {
                  /* a modifier !! */
                  /* fprintf(fdest, "%c", image->comps[0].data[w * h - ((i) / (w) + 1) * w + (i) % (w)]); */
                  fprintf(fdest, "%c", image->comps[0].data[w * hr - ((i) / (wr) + 1) * w + (i) % (wr)]);
                  /*if (((i + 1) % w == 0 && w % 2))
                  fprintf(fdest, "%c", 0); */
                  if ((i + 1) % wr == 0) {
                        for (pad = wr % 4 ? 4 - wr % 4 : 0; pad > 0; pad--)   /* ADD */
                              fprintf(fdest, "%c", 0);
                  }
            }
            fclose(fdest);
      }

      return 0;
}

/* -->> -->> -->> -->>

PGX IMAGE FORMAT

<<-- <<-- <<-- <<-- */


unsigned char readuchar(FILE * f)
{
  unsigned char c1;
  fread(&c1, 1, 1, f);
  return c1;
}

unsigned short readushort(FILE * f, int bigendian)
{
  unsigned char c1, c2;
  fread(&c1, 1, 1, f);
  fread(&c2, 1, 1, f);
  if (bigendian)
    return (c1 << 8) + c2;
  else
    return (c2 << 8) + c1;
}

unsigned int readuint(FILE * f, int bigendian)
{
  unsigned char c1, c2, c3, c4;
  fread(&c1, 1, 1, f);
  fread(&c2, 1, 1, f);
  fread(&c3, 1, 1, f);
  fread(&c4, 1, 1, f);
  if (bigendian)
    return (c1 << 24) + (c2 << 16) + (c3 << 8) + c4;
  else
    return (c4 << 24) + (c3 << 16) + (c2 << 8) + c1;
}

opj_image_t* pgxtoimage(char *filename, opj_cparameters_t *parameters) {
      FILE *f = NULL;
      int w, h, prec;
      int i, numcomps, max;
      OPJ_COLOR_SPACE color_space;
      opj_image_cmptparm_t cmptparm;      /* maximum of 1 component  */
      opj_image_t * image = NULL;

      char endian1,endian2,sign;
      char signtmp[32];

      char temp[32];
      int bigendian;
      opj_image_comp_t *comp = NULL;

      numcomps = 1;
      color_space = CLRSPC_GRAY;

      memset(&cmptparm, 0, sizeof(opj_image_cmptparm_t));

      max = 0;

      f = fopen(filename, "rb");
      if (!f) {
        fprintf(stderr, "Failed to open %s for reading !\n", filename);
        return NULL;
      }

      fseek(f, 0, SEEK_SET);
      fscanf(f, "PG%[ \t]%c%c%[ \t+-]%d%[ \t]%d%[ \t]%d",temp,&endian1,&endian2,signtmp,&prec,temp,&w,temp,&h);
      
      i=0;
      sign='+';         
      while (signtmp[i]!='\0') {
            if (signtmp[i]=='-') sign='-';
            i++;
      }
      
      fgetc(f);
      if (endian1=='M' && endian2=='L') {
            bigendian = 1;
      } else if (endian2=='M' && endian1=='L') {
            bigendian = 0;
      } else {
            fprintf(stderr, "Bad pgx header, please check input file\n");
            return NULL;
      }

      /* initialize image component */

      cmptparm.x0 = parameters->image_offset_x0;
      cmptparm.y0 = parameters->image_offset_y0;
      cmptparm.w = !cmptparm.x0 ? (w - 1) * parameters->subsampling_dx + 1 : cmptparm.x0 + (w - 1) * parameters->subsampling_dx + 1;
      cmptparm.h = !cmptparm.y0 ? (h - 1) * parameters->subsampling_dy + 1 : cmptparm.y0 + (h - 1) * parameters->subsampling_dy + 1;
      
      if (sign == '-') {
            cmptparm.sgnd = 1;
      } else {
            cmptparm.sgnd = 0;
      }
      cmptparm.prec = prec;
      cmptparm.bpp = prec;
      cmptparm.dx = parameters->subsampling_dx;
      cmptparm.dy = parameters->subsampling_dy;
      
      /* create the image */
      image = opj_image_create(numcomps, &cmptparm, color_space);
      if(!image) {
            fclose(f);
            return NULL;
      }
      /* set image offset and reference grid */
      image->x0 = cmptparm.x0;
      image->y0 = cmptparm.x0;
      image->x1 = cmptparm.w;
      image->y1 = cmptparm.h;

      /* set image data */

      comp = &image->comps[0];

      for (i = 0; i < w * h; i++) {
            int v;
            if (comp->prec <= 8) {
                  if (!comp->sgnd) {
                        v = readuchar(f);
                  } else {
                        v = (char) readuchar(f);
                  }
            } else if (comp->prec <= 16) {
                  if (!comp->sgnd) {
                        v = readushort(f, bigendian);
                  } else {
                        v = (short) readushort(f, bigendian);
                  }
            } else {
                  if (!comp->sgnd) {
                        v = readuint(f, bigendian);
                  } else {
                        v = (int) readuint(f, bigendian);
                  }
            }
            if (v > max)
                  max = v;
            comp->data[i] = v;
      }
      fclose(f);
      comp->bpp = int_floorlog2(max) + 1;

      return image;
}

int imagetopgx(opj_image_t * image, char *outfile) {
      int w, wr, h, hr;
      int i, j, compno;
      FILE *fdest = NULL;

      for (compno = 0; compno < image->numcomps; compno++) {
            opj_image_comp_t *comp = &image->comps[compno];
            char name[256];
            int nbytes = 0;
            char *tmp = outfile;
            while (*tmp) {
                  tmp++;
            }
            while (*tmp!='.') {
                  tmp--;
            }
            *tmp='\0';

            if (image->numcomps > 1) {
                  sprintf(name, "%s-%d.pgx", outfile, compno);
            } else {
                  sprintf(name, "%s.pgx", outfile);
            }
            fdest = fopen(name, "wb");
            if (!fdest) {
                  fprintf(stderr, "ERROR -> failed to open %s for writing\n", name);
                  return 1;
            }
            /* w = int_ceildiv(image->x1 - image->x0, comp->dx); */
            /* wr = int_ceildiv(int_ceildivpow2(image->x1 - image->x0,image->factor), comp->dx); */
            w = image->comps[compno].w;
            wr = int_ceildivpow2(image->comps[compno].w, image->comps[compno].factor);
          
            /* h = int_ceildiv(image->y1 - image->y0, comp->dy); */
            /* hr = int_ceildiv(int_ceildivpow2(image->y1 - image->y0,image->factor), comp->dy); */
            h = image->comps[compno].h;
            hr = int_ceildivpow2(image->comps[compno].h, image->comps[compno].factor);
          
            fprintf(fdest, "PG ML %c %d %d %d\n", comp->sgnd ? '-' : '+', comp->prec, wr, hr);
            if (comp->prec <= 8) {
                  nbytes = 1;
            } else if (comp->prec <= 16) {
                  nbytes = 2;
            } else {
                  nbytes = 4;
            }
            for (i = 0; i < wr * hr; i++) {
                  int v = image->comps[compno].data[i / wr * w + i % wr];
                  for (j = nbytes - 1; j >= 0; j--) {
                        char byte = (char) (v >> (j * 8));
                        fwrite(&byte, 1, 1, fdest);
                  }
            }
            fclose(fdest);
      }

      return 0;
}

/* -->> -->> -->> -->>

PNM IMAGE FORMAT

<<-- <<-- <<-- <<-- */

opj_image_t* pnmtoimage(char *filename, opj_cparameters_t *parameters) {
      int subsampling_dx = parameters->subsampling_dx;
      int subsampling_dy = parameters->subsampling_dy;

      FILE *f = NULL;
      int i, compno, numcomps, w, h;
      OPJ_COLOR_SPACE color_space;
      opj_image_cmptparm_t cmptparm[3];   /* maximum of 3 components */
      opj_image_t * image = NULL;
      char value;
      
      f = fopen(filename, "rb");
      if (!f) {
            fprintf(stderr, "\033[0;33mFailed to open %s for reading !!\033[0;39m\n", filename);
            return 0;
      }

      if (fgetc(f) != 'P')
            return 0;
      value = fgetc(f);

            switch(value) {
                  case '2':   /* greyscale image type */
                  case '5':
                        numcomps = 1;
                        color_space = CLRSPC_GRAY;
                        break;
                        
                  case '3':   /* RGB image type */
                  case '6':
                        numcomps = 3;
                        color_space = CLRSPC_SRGB;
                        break;
                        
                  default:
                        fclose(f);
                        return NULL;
            }
            
            fgetc(f);
            
            /* skip comments */
            while(fgetc(f) == '#') while(fgetc(f) != '\n');
            
            fseek(f, -1, SEEK_CUR);
            fscanf(f, "%d %d\n255", &w, &h);                
            fgetc(f);   /* <cr><lf> */
            
      /* initialize image components */
      memset(&cmptparm[0], 0, 3 * sizeof(opj_image_cmptparm_t));
      for(i = 0; i < numcomps; i++) {
            cmptparm[i].prec = 8;
            cmptparm[i].bpp = 8;
            cmptparm[i].sgnd = 0;
            cmptparm[i].dx = subsampling_dx;
            cmptparm[i].dy = subsampling_dy;
            cmptparm[i].w = w;
            cmptparm[i].h = h;
      }
      /* create the image */
      image = opj_image_create(numcomps, &cmptparm[0], color_space);
      if(!image) {
            fclose(f);
            return NULL;
      }

      /* set image offset and reference grid */
      image->x0 = parameters->image_offset_x0;
      image->y0 = parameters->image_offset_y0;
      image->x1 = parameters->image_offset_x0 + (w - 1) *   subsampling_dx + 1;
      image->y1 = parameters->image_offset_y0 + (h - 1) *   subsampling_dy + 1;

      /* set image data */

      if ((value == '2') || (value == '3')) {   /* ASCII */
            for (i = 0; i < w * h; i++) {
                  for(compno = 0; compno < numcomps; compno++) {
                        unsigned int index = 0;
                        fscanf(f, "%u", &index);
                        /* compno : 0 = GREY, (0, 1, 2) = (R, G, B) */
                        image->comps[compno].data[i] = index;
                  }
            }
      } else if ((value == '5') || (value == '6')) {  /* BINARY */
            for (i = 0; i < w * h; i++) {
                  for(compno = 0; compno < numcomps; compno++) {
                        unsigned char index = 0;
                        fread(&index, 1, 1, f);
                        /* compno : 0 = GREY, (0, 1, 2) = (R, G, B) */
                        image->comps[compno].data[i] = index;
                  }
            }
      }

      fclose(f);

      return image;
}

int imagetopnm(opj_image_t * image, char *outfile) {
      int w, wr, wrr, h, hr, hrr, max;
      int i, compno;
      int adjust;
      FILE *fdest = NULL;
      char S2;
      char *tmp = outfile;

      while (*tmp) {
            tmp++;
      }
      tmp--;
      tmp--;
      S2 = *tmp;

      if (image->numcomps == 3 && image->comps[0].dx == image->comps[1].dx
            && image->comps[1].dx == image->comps[2].dx
            && image->comps[0].dy == image->comps[1].dy
            && image->comps[1].dy == image->comps[2].dy
            && image->comps[0].prec == image->comps[1].prec
            && image->comps[1].prec == image->comps[2].prec
            && S2 !='g' && S2 !='G') {

            fdest = fopen(outfile, "wb");
            if (!fdest) {
                  fprintf(stderr, "ERROR -> failed to open %s for writing\n", outfile);
                  return 1;
            }

            w = int_ceildiv(image->x1 - image->x0, image->comps[0].dx);
            /* wr = int_ceildiv(int_ceildivpow2(image->x1 - image->x0,image->factor),image->comps[0].dx); */
            wr = image->comps[0].w;
            wrr = int_ceildivpow2(image->comps[0].w, image->comps[0].factor);
        
            h = int_ceildiv(image->y1 - image->y0, image->comps[0].dy);
            /* hr = int_ceildiv(int_ceildivpow2(image->y1 - image->y0,image->factor), image->comps[0].dy); */
            hr = image->comps[0].h;
            hrr = int_ceildivpow2(image->comps[0].h, image->comps[0].factor);
          
            max = image->comps[0].prec > 8 ? 255 : (1 << image->comps[0].prec) - 1;
          
            image->comps[0].x0 = int_ceildivpow2(image->comps[0].x0 - int_ceildiv(image->x0, image->comps[0].dx), image->comps[0].factor);
            image->comps[0].y0 = int_ceildivpow2(image->comps[0].y0 -   int_ceildiv(image->y0, image->comps[0].dy), image->comps[0].factor);

            fprintf(fdest, "P6\n%d %d\n%d\n", wrr, hrr, max);
            adjust = image->comps[0].prec > 8 ? image->comps[0].prec - 8 : 0;
            for (i = 0; i < wrr * hrr; i++) {
                  int r, g, b;
                  unsigned char rc,gc,bc;
                  r = image->comps[0].data[i / wrr * wr + i % wrr];
                  r += (image->comps[0].sgnd ? 1 << (image->comps[0].prec - 1) : 0);
                  rc = (unsigned char) ((r >> adjust)+((r >> (adjust-1))%2));

                  g = image->comps[1].data[i / wrr * wr + i % wrr];
                  g += (image->comps[1].sgnd ? 1 << (image->comps[1].prec - 1) : 0);
                  gc = (unsigned char) ((g >> adjust)+((g >> (adjust-1))%2));
                  
                  b = image->comps[2].data[i / wrr * wr + i % wrr];
                  b += (image->comps[2].sgnd ? 1 << (image->comps[2].prec - 1) : 0);
                  bc = (unsigned char) ((b >> adjust)+((b >> (adjust-1))%2));
                  
                  fprintf(fdest, "%c%c%c", rc, gc, bc);
            }
            fclose(fdest);
      } else {
            int ncomp=(S2=='g' || S2=='G')?1:image->numcomps;
            if (image->numcomps>ncomp) {
                  fprintf(stderr,"WARNING -> [PGM files] Only the first component\n");
                  fprintf(stderr,"           is written to the file\n");
            }
            for (compno = 0; compno < ncomp; compno++) {
                  char name[256];
                  if (ncomp > 1) {
                        sprintf(name, "%d.%s", compno, outfile);
                  } else {
                        sprintf(name, "%s", outfile);
                  }
                  
                  fdest = fopen(name, "wb");
                  if (!fdest) {
                        fprintf(stderr, "ERROR -> failed to open %s for writing\n", name);
                        return 1;
                  }
            
                  w = int_ceildiv(image->x1 - image->x0, image->comps[compno].dx);
                  /* wr = int_ceildiv(int_ceildivpow2(image->x1 - image->x0,image->factor),image->comps[compno].dx); */
                  wr = image->comps[compno].w;
                  wrr = int_ceildivpow2(image->comps[compno].w, image->comps[compno].factor);
                  
                  h = int_ceildiv(image->y1 - image->y0, image->comps[compno].dy);
                  /* hr = int_ceildiv(int_ceildivpow2(image->y1 - image->y0,image->factor), image->comps[compno].dy); */
                  hr = image->comps[compno].h;
                  hrr = int_ceildivpow2(image->comps[compno].h, image->comps[compno].factor);
                  
                  max = image->comps[compno].prec > 8 ? 255 : (1 << image->comps[compno].prec) - 1;
                  
                  image->comps[compno].x0 = int_ceildivpow2(image->comps[compno].x0 - int_ceildiv(image->x0, image->comps[compno].dx), image->comps[compno].factor);
                  image->comps[compno].y0 = int_ceildivpow2(image->comps[compno].y0 - int_ceildiv(image->y0, image->comps[compno].dy), image->comps[compno].factor);
                  
                  fprintf(fdest, "P5\n%d %d\n%d\n", wrr, hrr, max);
                  adjust = image->comps[compno].prec > 8 ? image->comps[compno].prec - 8 : 0;

                  for (i = 0; i < wrr * hrr; i++) {
                        int l;
                        unsigned char lc;
                        l = image->comps[compno].data[i / wrr * wr + i % wrr];
                        l += (image->comps[compno].sgnd ? 1 << (image->comps[compno].prec - 1) : 0);
                        lc = (unsigned char) ((l >> adjust)+((l >> (adjust-1))%2));
                        fprintf(fdest, "%c", lc);
                  }
                  fclose(fdest);
            }
      }

      return 0;
}

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