#include "CRC.hpp"
#include <stm32f4xx_crc.h>
#include "Constants.hpp"
#include "App.hpp"



TZApp::CCrc Crc;

//------------------------------------------------------------------------------

TZApp::CCrc::CCrc(void)
{
}
/** Berechnet die inverse CRC, um bei Unterbrechung der CRC-Unit an alter Stelle weitermachen zu können
 *
 * @param CurrentCrc : jetzige CRC
 * @param DesiredCrc : gewünschte CRC
 *
 * @return Data      : Wert, von der die berechntete CRC der gewünschten CRC entspricht
 */
Tu32 TZApp::CCrc::Crc32RevFast(Tu32 CurrentCrc, Tu32 DesiredCrc) // sourcer32@gmail.com
{
  static const Tu32 CrcTable[16] = {
    0x00000000,0xB2B4BCB6,0x61A864DB,0xD31CD86D,0xC350C9B6,0x71E47500,0xA2F8AD6D,0x104C11DB,
    0x82608EDB,0x30D4326D,0xE3C8EA00,0x517C56B6,0x4130476D,0xF384FBDB,0x209823B6,0x922C9F00 };

  Tu32 Data;

  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];
  DesiredCrc = (DesiredCrc >> 4) ^ CrcTable[DesiredCrc & 0x0F];

  Data = DesiredCrc ^ CurrentCrc;

  return(Data);
}
/** Berechnet die Checksumme für einen einzelnen 32-bit Wert (Hardware-CRC)
 *
 * @param Crc  : Bisherige CRC (für Blockberechnung)
 * @param Data : 32-bit Datenwert
 *
 * @return CRC : CRC-Wert
 */

Tu32 TZApp::CCrc::Crc32Fast(Tu32 Crc, Tu32 Data)
{
  static const Tu32 CrcTable[16] = { // Nibble lookup table for 0x04C11DB7 polynomial
    0x00000000,0x04C11DB7,0x09823B6E,0x0D4326D9,0x130476DC,0x17C56B6B,0x1A864DB2,0x1E475005,
    0x2608EDB8,0x22C9F00F,0x2F8AD6D6,0x2B4BCB61,0x350C9B64,0x31CD86D3,0x3C8EA00A,0x384FBDBD };

  Crc = Crc ^ Data; // Apply all 32-bits

  // Process 32-bits, 4 at a time, or 8 rounds

  Crc = (Crc << 4) ^ CrcTable[Crc >> 28]; // Assumes 32-bit reg, masking index to 4-bits
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28]; //  0x04C11DB7 Polynomial used in STM32
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28];
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28];
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28];
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28];
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28];
  Crc = (Crc << 4) ^ CrcTable[Crc >> 28];

  return(Crc);
}

//------------------------------------------------------------------------------

/* 8-bit CRC with polynomial x^8+x^6+x^3+x^2+1, 0x14D.
 Chosen based on Koopman, et al. (0xA6 in his notation = 0x14D >> 1):
 http://www.ece.cmu.edu/~koopman/roses/dsn04/koopman04_crc_poly_embedded.pdf
 */

const Tu8 TZApp::CCrc::crc8_table[] = {
    0x00, 0x3e, 0x7c, 0x42, 0xf8, 0xc6, 0x84, 0xba, 0x95, 0xab, 0xe9, 0xd7,
    0x6d, 0x53, 0x11, 0x2f, 0x4f, 0x71, 0x33, 0x0d, 0xb7, 0x89, 0xcb, 0xf5,
    0xda, 0xe4, 0xa6, 0x98, 0x22, 0x1c, 0x5e, 0x60, 0x9e, 0xa0, 0xe2, 0xdc,
    0x66, 0x58, 0x1a, 0x24, 0x0b, 0x35, 0x77, 0x49, 0xf3, 0xcd, 0x8f, 0xb1,
    0xd1, 0xef, 0xad, 0x93, 0x29, 0x17, 0x55, 0x6b, 0x44, 0x7a, 0x38, 0x06,
    0xbc, 0x82, 0xc0, 0xfe, 0x59, 0x67, 0x25, 0x1b, 0xa1, 0x9f, 0xdd, 0xe3,
    0xcc, 0xf2, 0xb0, 0x8e, 0x34, 0x0a, 0x48, 0x76, 0x16, 0x28, 0x6a, 0x54,
    0xee, 0xd0, 0x92, 0xac, 0x83, 0xbd, 0xff, 0xc1, 0x7b, 0x45, 0x07, 0x39,
    0xc7, 0xf9, 0xbb, 0x85, 0x3f, 0x01, 0x43, 0x7d, 0x52, 0x6c, 0x2e, 0x10,
    0xaa, 0x94, 0xd6, 0xe8, 0x88, 0xb6, 0xf4, 0xca, 0x70, 0x4e, 0x0c, 0x32,
    0x1d, 0x23, 0x61, 0x5f, 0xe5, 0xdb, 0x99, 0xa7, 0xb2, 0x8c, 0xce, 0xf0,
    0x4a, 0x74, 0x36, 0x08, 0x27, 0x19, 0x5b, 0x65, 0xdf, 0xe1, 0xa3, 0x9d,
    0xfd, 0xc3, 0x81, 0xbf, 0x05, 0x3b, 0x79, 0x47, 0x68, 0x56, 0x14, 0x2a,
    0x90, 0xae, 0xec, 0xd2, 0x2c, 0x12, 0x50, 0x6e, 0xd4, 0xea, 0xa8, 0x96,
    0xb9, 0x87, 0xc5, 0xfb, 0x41, 0x7f, 0x3d, 0x03, 0x63, 0x5d, 0x1f, 0x21,
    0x9b, 0xa5, 0xe7, 0xd9, 0xf6, 0xc8, 0x8a, 0xb4, 0x0e, 0x30, 0x72, 0x4c,
    0xeb, 0xd5, 0x97, 0xa9, 0x13, 0x2d, 0x6f, 0x51, 0x7e, 0x40, 0x02, 0x3c,
    0x86, 0xb8, 0xfa, 0xc4, 0xa4, 0x9a, 0xd8, 0xe6, 0x5c, 0x62, 0x20, 0x1e,
    0x31, 0x0f, 0x4d, 0x73, 0xc9, 0xf7, 0xb5, 0x8b, 0x75, 0x4b, 0x09, 0x37,
    0x8d, 0xb3, 0xf1, 0xcf, 0xe0, 0xde, 0x9c, 0xa2, 0x18, 0x26, 0x64, 0x5a,
    0x3a, 0x04, 0x46, 0x78, 0xc2, 0xfc, 0xbe, 0x80, 0xaf, 0x91, 0xd3, 0xed,
    0x57, 0x69, 0x2b, 0x15};

//------------------------------------------------------------------------------

Tu8 TZApp::CCrc::crc8(Tu8 crc, Tu8 *data, Tu8 len)
{
  Tu8 *end;

  crc ^= 0xff;
  end = data + len;
  do
  {
    crc = crc8_table[crc ^ *data++];
  } while (data < end);
  return crc ^ 0xff;
}

Tu32 TZApp::CCrc::BlockCrc(Tu32 pBuffer[], Tu32 BufferLength)
{
  CRC->CR = CRC_CR_RESET;

  for(Tu32 u32_Index = 0; u32_Index < BufferLength; u32_Index++)
  {
    CRC->DR = pBuffer[u32_Index];
  }
  return (CRC->DR);
}
//------------------------------------------------------------------------------

Tu32 TZApp::CCrc::SingleCrc(Tu32 Data)
{
  CRC->CR = CRC_CR_RESET;
  CRC->DR = Data;
  return (CRC->DR);
}