/******************************************************************************
** Functions by Derrick Sobodash
** http://www.cinnamonpirate.com/
** Submitted to ROM Hacking.net on July 3, 2006
******************************************************************************/

/******************************************************************************
** n64_read()
*******************************************************************************
** syntax: string n64_read(string filename)
*******************************************************************************
** Reads a Nintendo ROM to a string and deinterleaves if needed.
******************************************************************************/

function n64_read($infile)
{

  $fd = fopen($infile, "rb");

  $test = fread($fd, 4);
  fseek($fd, 0x0, SEEK_SET);

  $deinterleaved = chr(0x80) . chr(0x37) . chr(0x12) . chr(0x40);
  $interleaved   = chr(0x37) . chr(0x80) . chr(0x40) . chr(0x12);

  $rom = "";

  // Test for interleave
  if($test == $deinterleaved)
    $rom = fread($fd, filesize($infile));

  else if($test == $interleaved)
  {

    for($i = 0; $i < filesize($infile) / 2; $i ++)
    {
        
      $char1 = fgetc($fd);
      $char2 = fgetc($fd);
      $rom .= $char2 . $char1;

    }

  }

  else
    die("Error: n64_read(): Supplied ROM file does not appear to be Nintendo 64 ROM\r\n\r\n");

  fclose($fd);

  return($rom);

}