scrambler.h

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#ifndef SCRAMBLER_H_
#define SCRAMBLER_H_
 
#include <bitset>
#include <cstddef>
#include <cstdint>
#include <vector>
 
namespace AgoraScrambler {
// [1, 127] (93)
static constexpr uint8_t kScramblerInitState = 0x5D;
static constexpr uint8_t kScramblerlength = 127;
 
class Scrambler {
 public:
  Scrambler();
  ~Scrambler() = default;
 
  void Scramble(void* scrambled, const void* to_scramble,
                size_t bytes_to_scramble);
  void Scramble(void* inout_bytes, size_t bytes_to_scramble);
  void Descramble(void* descrambled, const void* scrambled,
                  size_t bytes_to_descramble);
  void Descramble(void* inout_bytes, size_t bytes_to_descramble);
 
 private:
  static void WlanScrambler(void* output_buffer, const void* input_buffer,
                            size_t num_bytes,
                            std::bitset<kScramblerlength>& scram_buffer,
                            std::vector<std::byte>& bit_buffer);
 
  static void ConvertBytesToBits(const std::byte* in_byte_buffer,
                                 size_t byte_buffer_size,
                                 std::byte* out_bit_buffer);
 
  static void ConvertBitsToBytes(const std::byte* in_bit_buffer,
                                 size_t byte_buffer_size,
                                 std::byte* out_byte_buffer);
 
  std::bitset<kScramblerlength> scram_buffer_;
  std::vector<std::byte> bit_buffer_;
};  // class Scrambler
 
};  // namespace AgoraScrambler
 
#endif  // SCRAMBLER_H_