// replace the following typedefs for your platform
typedef unsigned char  u_int08;  //  8 bit type
typedef unsigned short u_int16;  // 16 bit type
typedef unsigned int   u_int32;  // 32 bit type


u_int16 calculateCrc(
	/*in*/ u_int08* buffer,  // address of data which calculate the CRC
	/*in*/ u_int32 size,     // length of data which calculate the CRC
	/*in*/ u_int16 initial   // initial value used to calculate CRC
	)
{
	static const u_int16 crcTable[] =
	{
		0x0,
		0x1189,
		0x2312,
		0x329B,
		0x4624,
		0x57AD,
		0x6536,
		0x74BF,
		0x8C48,
		0x9DC1,
		0xAF5A,
		0xBED3,
		0xCA6C,
		0xDBE5,
		0xE97E,
		0xF8F7,
		0x1081,
		0x108,
		0x3393,
		0x221A,
		0x56A5,
		0x472C,
		0x75B7,
		0x643E,
		0x9CC9,
		0x8D40,
		0xBFDB,
		0xAE52,
		0xDAED,
		0xCB64,
		0xF9FF,
		0xE876,
		0x2102,
		0x308B,
		0x210,
		0x1399,
		0x6726,
		0x76AF,
		0x4434,
		0x55BD,
		0xAD4A,
		0xBCC3,
		0x8E58,
		0x9FD1,
		0xEB6E,
		0xFAE7,
		0xC87C,
		0xD9F5,
		0x3183,
		0x200A,
		0x1291,
		0x318,
		0x77A7,
		0x662E,
		0x54B5,
		0x453C,
		0xBDCB,
		0xAC42,
		0x9ED9,
		0x8F50,
		0xFBEF,
		0xEA66,
		0xD8FD,
		0xC974,
		0x4204,
		0x538D,
		0x6116,
		0x709F,
		0x420,
		0x15A9,
		0x2732,
		0x36BB,
		0xCE4C,
		0xDFC5,
		0xED5E,
		0xFCD7,
		0x8868,
		0x99E1,
		0xAB7A,
		0xBAF3,
		0x5285,
		0x430C,
		0x7197,
		0x601E,
		0x14A1,
		0x528,
		0x37B3,
		0x263A,
		0xDECD,
		0xCF44,
		0xFDDF,
		0xEC56,
		0x98E9,
		0x8960,
		0xBBFB,
		0xAA72,
		0x6306,
		0x728F,
		0x4014,
		0x519D,
		0x2522,
		0x34AB,
		0x630,
		0x17B9,
		0xEF4E,
		0xFEC7,
		0xCC5C,
		0xDDD5,
		0xA96A,
		0xB8E3,
		0x8A78,
		0x9BF1,
		0x7387,
		0x620E,
		0x5095,
		0x411C,
		0x35A3,
		0x242A,
		0x16B1,
		0x738,
		0xFFCF,
		0xEE46,
		0xDCDD,
		0xCD54,
		0xB9EB,
		0xA862,
		0x9AF9,
		0x8B70,
		0x8408,
		0x9581,
		0xA71A,
		0xB693,
		0xC22C,
		0xD3A5,
		0xE13E,
		0xF0B7,
		0x840,
		0x19C9,
		0x2B52,
		0x3ADB,
		0x4E64,
		0x5FED,
		0x6D76,
		0x7CFF,
		0x9489,
		0x8500,
		0xB79B,
		0xA612,
		0xD2AD,
		0xC324,
		0xF1BF,
		0xE036,
		0x18C1,
		0x948,
		0x3BD3,
		0x2A5A,
		0x5EE5,
		0x4F6C,
		0x7DF7,
		0x6C7E,
		0xA50A,
		0xB483,
		0x8618,
		0x9791,
		0xE32E,
		0xF2A7,
		0xC03C,
		0xD1B5,
		0x2942,
		0x38CB,
		0xA50,
		0x1BD9,
		0x6F66,
		0x7EEF,
		0x4C74,
		0x5DFD,
		0xB58B,
		0xA402,
		0x9699,
		0x8710,
		0xF3AF,
		0xE226,
		0xD0BD,
		0xC134,
		0x39C3,
		0x284A,
		0x1AD1,
		0xB58,
		0x7FE7,
		0x6E6E,
		0x5CF5,
		0x4D7C,
		0xC60C,
		0xD785,
		0xE51E,
		0xF497,
		0x8028,
		0x91A1,
		0xA33A,
		0xB2B3,
		0x4A44,
		0x5BCD,
		0x6956,
		0x78DF,
		0xC60,
		0x1DE9,
		0x2F72,
		0x3EFB,
		0xD68D,
		0xC704,
		0xF59F,
		0xE416,
		0x90A9,
		0x8120,
		0xB3BB,
		0xA232,
		0x5AC5,
		0x4B4C,
		0x79D7,
		0x685E,
		0x1CE1,
		0xD68,
		0x3FF3,
		0x2E7A,
		0xE70E,
		0xF687,
		0xC41C,
		0xD595,
		0xA12A,
		0xB0A3,
		0x8238,
		0x93B1,
		0x6B46,
		0x7ACF,
		0x4854,
		0x59DD,
		0x2D62,
		0x3CEB,
		0xE70,
		0x1FF9,
		0xF78F,
		0xE606,
		0xD49D,
		0xC514,
		0xB1AB,
		0xA022,
		0x92B9,
		0x8330,
		0x7BC7,
		0x6A4E,
		0x58D5,
		0x495C,
		0x3DE3,
		0x2C6A,
		0x1EF1,
		0xF78,
	};
	
	u_int16 crc = initial;

	while(size--)
	{
		crc = crcTable[(u_int08)( (*buffer)^(u_int08)crc )] ^ (crc>>8);
		buffer++;
	}
	
	// result
	return crc;
}

main()
{
  // The following are just some example about how to use it.


  // Example 1: calculating the CRC of an ASCII buffer  
  char ascii[] = "Emidio Planamente";
  printf("CRC of '%s' is %d\n", ascii, calculateCrc(ascii, strlen(ascii), 0));
  
  
  // Example 2: calculating the CRC of a BINARY buffer
  unsigned int size = 10;
  unsigned char binary[size];
  unsigned int i = 0;
  for(i = 0; i < size; ++i)
  {
		binary[i] = size - 1 - i;
  }
  printf("CRC of %s is %d\n", binary, calculateCrc(binary, sizeof(binary), 0));
  
}