/*	combine_band_interleave.c
**	this program combine the 
**      input generic binary image file then output
**      "band interleave by line" image!
*/

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <math.h>

main(int argc, char **argv)
{
  FILE 		*f1,*f2, *fout;
  unsigned long int img_length;
  unsigned long int img_width, step;
  unsigned long int num_of_band, bandth_num;
  unsigned long int count1, count2, count3;
  unsigned char *store, *sub_row_start;

  if(argc == 6)
    {
      img_length = atoi(argv[1]);
      img_width = atoi(argv[2]);

      store = (unsigned char *)malloc(img_width);

      if((fout = fopen(argv[3],"wb")) == NULL)
       {
         fprintf(stderr,"Failed to open %s\n",argv[3]);
         exit(EXIT_FAILURE);
       }

      if((f1 = fopen(argv[4],"rb")) == NULL)
	{
	  fprintf(stderr,"Failed to open %s\n",argv[4]);
	  exit(EXIT_FAILURE);
	}
      if((f2 = fopen(argv[5],"rb")) == NULL)
	{
	  fprintf(stderr,"Failed to open %s\n",argv[5]);
	  exit(EXIT_FAILURE);
	}

      for(count1 = 0; count1 < img_length; count1++)
	{
	fread(store,1,img_width,f1);
        fwrite(store,1,img_width,fout);
	fread(store,1,img_width,f2);
        fwrite(store,1,img_width,fout);
	}

	
      fclose(f1);
      fclose(f2);
      
      fclose(fout);
      free(store);

    }
  else
      printf("\nUsage:\n\tcombine_interleave  'rows in file' ' cols' 'output file' 'input file1' 'file2' .\n\n");
}