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

void main() {
  //FILE *master = fopen("master.bmp", "rb");
  FILE *master = fopen("master.raw", "rb");
  FILE *maska = fopen("mask-blue-inverted.bmp", "rb");
  FILE *maskb = fopen("mask-green1-inverted.bmp", "rb");
  FILE *maskc = fopen("mask-green2-inverted.bmp", "rb");
  FILE *out = fopen("merged.raw", "wb");
  int masterbyte=0, maskbytea=0, maskbyteb=0, maskbytec=0;
  unsigned char outbyte=0;

  //fseek(master, 1146, SEEK_SET);
  fseek(maska, 1146, SEEK_SET);
  fseek(maskb, 1146, SEEK_SET);
  fseek(maskc, 1146, SEEK_SET);

  // 0x01 = 00000001
  // 0x02 = 00000010
  // 0x03 = 00000011
  // 0xFC = 11111100
  // 0xFD = 11111101
  // 0xFE = 11111110

  while ((masterbyte = getc(master)) != EOF) {
    maskbytea = fgetc(maska);
    maskbyteb = fgetc(maskb);
    maskbytec = fgetc(maskc);

    // DEBUG
    //printf("Reading byte %lu", ftell(master));

    //maskbyte = fgetc(mask);
    outbyte = (unsigned char)masterbyte;

    // DEBUG
    //printf(" Value: %u", outbyte);
    
    outbyte = outbyte & 0xFC;
    if (maskbytea != 0) {
      outbyte = outbyte | 1;
    } else if (maskbyteb != 0) {
      outbyte = outbyte | 2;
    } else if (maskbytec != 0) {
      outbyte = outbyte | 3;
    }

    // DEBUG
    //printf(" Output: %u\n", outbyte);
    fprintf(out, "%c", outbyte);
  }

  fclose(master);
  fclose(maska);
  fclose(maskb);
  fclose(maskc);
  fclose(out);
}