/*
 * Trevor's quick & dirty hack to convert from BMP to OTA.
 *
 * Copyright (C) 2003 Trevor Man
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <stdio.h>

inline unsigned long get_long(FILE *fp);
inline unsigned int get_short(FILE *fp);

int main(int argc, char *argv[])
{
  FILE *fp_in;
  FILE *fp_out = NULL;
  unsigned long file_size;
  unsigned long offset;
  unsigned long temp_long;
  unsigned int temp_short;
  unsigned long bitmap_width;
  unsigned long bitmap_height;
  unsigned int bitmap_planes;
  unsigned int bitmap_bitcount;
  int count;
  int padding_count;

  if (argc != 3 && argc != 4) {
    fprintf(stderr, "Usage: %s bmp_file ota_file [reverse]\n", argv[0]);
    return -1;
  }

  if ((fp_in = fopen(argv[1], "rb")) == NULL) {
    fprintf(stderr, "Unable to open %s for reading.\n", argv[1]);
    return -1;
  }

  if ((fp_out = fopen(argv[2], "wb")) == NULL) {
    fprintf(stderr, "Unable to open %s for writing.\n", argv[2]);
    return -1;
  }

  fseek(fp_in, 0, SEEK_END);
  file_size = ftell(fp_in);
  fseek(fp_in, 0, SEEK_SET);

  if (get_short(fp_in) != 0x4D42) { // Check for BM
    fprintf(stderr, "ERROR: BM signature not found.\n");
    return -1;
  }

  if ((temp_long = get_long(fp_in)) != file_size) {
    fprintf(stderr, "WARNING: Header file size (%ld) and real file size (%ld) differ.\n", temp_long, file_size);
  }

  if ((temp_short = get_short(fp_in)) != 0) { // Check that reserved1 == 0
    fprintf(stderr, "WARNING: Reserved1 (%X) field != 0\n", temp_short);
  }
  if ((temp_short = get_short(fp_in)) != 0) { // Check that reserved2 == 0
    fprintf(stderr, "WARNING: Reserved2 (%X) field != 0\n", temp_short);
  }

  offset = get_long(fp_in);

  if ((temp_long = get_long(fp_in)) != 40) { // Check that sizeof(BITMAPINFOHEADER) == 40
    fprintf(stderr, "WARNING: sizeof(BITMAPINFOHEADER) (%ld) != 40\n", temp_long);
  }

  if ((bitmap_width = get_long(fp_in)) != 72) { // Check that width == 72
    fprintf(stderr, "ERROR: Invalid width (%ld).  Must be 72.\n", bitmap_width);
    return -1;
  }

  if ((bitmap_height = get_long(fp_in)) != 28) { // Check that height == 28
    fprintf(stderr, "ERROR: Invalid height (%ld).  Must be 28.\n", bitmap_height);
    return -1;
  }

  if ((bitmap_planes = get_short(fp_in)) != 1) { // Check that planes == 1
    fprintf(stderr, "ERROR: Invalid planes (%d).  Must be 1.\n", bitmap_planes);
    return -1;
  }

  if ((bitmap_bitcount = get_short(fp_in)) != 1) { // Check that bitcount == 1
    fprintf(stderr, "ERROR: Invalid bitcount (%d).  Must be 1.\n", bitmap_bitcount);
    return -1;
  }

  if ((temp_long = get_long(fp_in)) != 0) { // Check that compression is turned off
    fprintf(stderr, "ERROR: Must be uncompressed BMP.\n");
    return -1;
  }

  fseek(fp_in, offset, SEEK_SET); // Skip to bitmap data

  fputc(0x00, fp_out);
  fputc(bitmap_width, fp_out);
  fputc(bitmap_height, fp_out);
  fputc(bitmap_bitcount, fp_out);

  fseek(fp_out, 4 + ((bitmap_width / 8) * (bitmap_height - 1)), SEEK_SET);
  for (count = 0; count < (bitmap_height * bitmap_width); count += 8) {
    temp_short = fgetc(fp_in);

    if (argc == 4)
      temp_short = ~temp_short;

    fprintf(stdout, "%c%c%c%c%c%c%c%c", temp_short & 0x80 ? '#' : ' ',
                                        temp_short & 0x40 ? '#' : ' ',
                                        temp_short & 0x20 ? '#' : ' ',
                                        temp_short & 0x10 ? '#' : ' ',
                                        temp_short & 0x08 ? '#' : ' ',
                                        temp_short & 0x04 ? '#' : ' ',
                                        temp_short & 0x02 ? '#' : ' ',
                                        temp_short & 0x01 ? '#' : ' ');
    if (fp_out)
      fputc(temp_short, fp_out);
    if ((count > 0) && ((count + 8) % bitmap_width == 0)) {
      fprintf(stdout, "\n");
      for (padding_count = 0; padding_count < (4 - (bitmap_width / 8) % 4); padding_count++) {
        fgetc(fp_in);
      }
      fseek(fp_out, 4 + ((bitmap_width / 8) * (bitmap_height - ((count + 8) / bitmap_width) - 1)), SEEK_SET);
    }
  }

  fclose(fp_in);
  if (fp_out)
    fclose(fp_out);

  return 0;
}

inline unsigned long get_long(FILE *fp)
{
  return fgetc(fp) | fgetc(fp) << 8 | fgetc(fp) << 16 | fgetc(fp) << 24;
}

inline unsigned int get_short(FILE *fp)
{
  return fgetc(fp) | fgetc(fp) << 8;
}