/*
 *  This file is part of x48, an emulator of the HP-48sx Calculator.
 *  Copyright (C) 1994  Eddie C. Dost  (ecd@dressler.de)
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* $Log: checkrom.c,v $
 * Revision 1.4  1995/01/11  18:20:01  ecd
 * major update to support HP48 G/GX
 *
 * Revision 1.3  1994/11/02  14:40:38  ecd
 * support for "compressed" rom files added
 *
 * Revision 1.3  1994/11/02  14:40:38  ecd
 * support for "compressed" rom files added
 *
 * Revision 1.2  1994/10/06  16:30:05  ecd
 * changed char to unsigned
 *
 * Revision 1.1  1994/10/01  10:12:53  ecd
 * Initial revision
 *
 *
 * $Id: checkrom.c,v 1.4 1995/01/11 18:20:01 ecd Exp ecd $
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>

#include "global.h"
#include "romio.h"

unsigned char *rom;
unsigned short rom_crc, crc;

int   verbose = 0;
char *progname;

#define calc_crc(n) (crc = ((crc >> 4) ^ (((crc ^ n) & 0xf) * 0x1081)))

int
#ifdef __FunctionProto__
main(int argc, char **argv)
#else
main(argc, argv)
int argc;
char **argv;
#endif
{
  unsigned char version[7];
  long ver_addr;
  int i, a, c, d, d0, d1, D0, D1;
  int fail;

  if (argc < 2) {
    LOGE( "usage: %s rom-file\n", argv[0]);
    exit (1);
  }

  if (!read_rom_file(argv[1], &rom, &rom_size))
    {
      LOGE( "%s: can\'t read ROM from %s\n", argv[0], argv[1]);
      exit (1);
    }

  if (opt_gx != 0)
    ver_addr = 0x7ffbf;
  else
    ver_addr = 0x7fff0;

  for (i = 0; i < 6; i++) {
    version[i] = rom[ver_addr + 2 * i + 1] << 4;
    version[i] |= rom[ver_addr + 2 * i];
  }
  version[6] = '\0';
  printf("ROM Version is %s\n", version);


  for (i = 0x100; i < 0x140; i++) {
    rom[i] = 0x0;
  }

  fail = a = 0;
  D0 = 0x00000;
  D1 = 0x40000;
  for (d = 1; d <= rom_size / 0x80000; d++) {

    crc = 0x0000;
    rom_crc = 0;
    for (i = 0; i < 4; i++) {
      rom_crc <<= 4;
      rom_crc |= (rom[0x80000 * d - i - 1] & 0x0f);
    }

    if (opt_gx)
      printf("ROM CRC %d reads 0x%.4x\n", d, rom_crc);
    else
      printf("ROM CRC reads 0x%.4x\n", rom_crc);

    d0 = D0;
    d1 = D1;
    for (c = 0x3fff; c >= 0x0000; c--) {
      for (i = 0; i < 16; i++) {
        calc_crc(rom[d0 + i]);
      }
      d0 += 16;
      for (i = 0; i < 16; i++) {
        calc_crc(rom[d1 + i]);
      }
      d1 += 16;
    }
    D0 += 0x80000;
    D1 += 0x80000;
    a = crc;
    a = ((a | 0xf0000) + 1) & 0xfffff;

    if (a != 0x00000) {
      fail++;
    }
  }

  if (fail != 0)
    printf("IROM %.4x: ROM CRC test FAILED !!!\n", a & 0xffff);
  else
    printf("IROM OK: ROM CRC test passed.\n");

  return 0;
}