#include <stdint.h>

// Define FT8 symbol counts
constexpr int FT8_ND = 58;      // Data symbols
constexpr int FT8_NS = 21;      // Sync symbols (3 @ Costas 7x7)
constexpr int FT8_NN = FT8_NS + FT8_ND;   // Total channel symbols (79)

// Define the LDPC sizes
constexpr int FT8_N = 174;      // Number of bits in the encoded message
constexpr int FT8_K = 91;       // Number of payload bits
constexpr int FT8_M = FT8_N - FT8_K;    // Number of checksum bits
constexpr int FT8_K_BYTES = (FT8_K + 7) / 8;    // Number of whole bytes needed to store K bits

// Define CRC parameters
constexpr uint16_t CRC_POLYNOMIAL = 0x2757;  // CRC-14 polynomial without the leading (MSB) 1
constexpr int      CRC_WIDTH = 14;

// Costas 7x7 tone pattern
extern const uint8_t kCostas_map[7];


// Gray code map
extern const uint8_t kGray_map[8];


// Parity generator matrix for (174,91) LDPC code, stored in bitpacked format (MSB first)
extern const uint8_t kGenerator[FT8_M][FT8_K_BYTES];


// Column order (permutation) in which the bits in codeword are stored
// (Not really used in FT8 v2 - instead the Nm, Mn and generator matrices are already permuted)
extern const uint8_t kColumn_order[FT8_N];


// this is the LDPC(174,91) parity check matrix.
// 83 rows.
// each row describes one parity check.
// each number is an index into the codeword (1-origin).
// the codeword bits mentioned in each row must xor to zero.
// From WSJT-X's ldpc_174_91_c_reordered_parity.f90.
extern const uint8_t kNm[FT8_M][7];


// Mn from WSJT-X's bpdecode174.f90.
// each row corresponds to a codeword bit.
// the numbers indicate which three parity
// checks (rows in Nm) refer to the codeword bit.
// 1-origin.
extern const uint8_t kMn[FT8_N][3];


// Number of rows (columns in C/C++) in the array Nm.
extern const uint8_t kNrw[FT8_M];