HammingCodec_7_4.hh

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#ifndef COSA_HAMMINGCODEC_7_4_HH
#define COSA_HAMMINGCODEC_7_4_HH

#include <VWI.h>

class HammingCodec_7_4 : public VWI::Codec {
public:
  HammingCodec_7_4() :
    VWI::Codec(7, 0x12d5, 8)
  {
  }

  virtual const uint8_t* preamble()
  {
    return (s_preamble);
  }

  virtual uint8_t encode4(uint8_t nibble)
  {
    return (pgm_read_byte(&s_symbols[nibble & 0xf]));
  };

  virtual uint8_t decode4(uint8_t symbol)
  {
    symbol &= SYMBOL_MASK;
    uint8_t code = pgm_read_byte(&s_codes[symbol >> 1]);
    return ((symbol & 0x01) ? (code & 0x0f) : (code >> 4));
  }

private:
  static const uint8_t s_symbols[] PROGMEM;

  static const uint8_t s_codes[] PROGMEM;

  static const uint8_t s_preamble[] PROGMEM;
};

#endif