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120 lines
1.9 KiB
C++
120 lines
1.9 KiB
C++
/*
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LDPC table iterator
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Copyright 2018 Ahmet Inan <xdsopl@gmail.com>
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*/
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#ifndef LDPC_HH
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#define LDPC_HH
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namespace ldpctool {
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struct LDPCInterface
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{
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virtual LDPCInterface *clone() = 0;
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virtual int code_len() = 0;
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virtual int data_len() = 0;
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virtual int group_len() = 0;
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virtual int links_total() = 0;
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virtual int links_max_cn() = 0;
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virtual int bit_deg() = 0;
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virtual int *acc_pos() = 0;
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virtual void first_bit() = 0;
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virtual void next_bit() = 0;
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virtual ~LDPCInterface() = default;
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static const char *mc_tabnames[2][32];
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};
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template <typename TABLE>
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class LDPC : public LDPCInterface
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{
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static const int M = TABLE::M;
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static const int N = TABLE::N;
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static const int K = TABLE::K;
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static const int R = N-K;
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static const int q = R/M;
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int acc_pos_[TABLE::DEG_MAX];
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const int *row_ptr;
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int bit_deg_;
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int grp_num;
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int grp_len;
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int grp_cnt;
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int row_cnt;
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void next_group()
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{
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if (grp_cnt >= grp_len) {
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grp_len = TABLE::LEN[grp_num];
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bit_deg_ = TABLE::DEG[grp_num];
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grp_cnt = 0;
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++grp_num;
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}
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for (int i = 0; i < bit_deg_; ++i)
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acc_pos_[i] = row_ptr[i];
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row_ptr += bit_deg_;
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++grp_cnt;
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}
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public:
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LDPCInterface *clone()
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{
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return new LDPC<TABLE>();
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}
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int code_len()
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{
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return N;
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}
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int data_len()
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{
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return K;
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}
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int group_len()
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{
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return M;
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}
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int links_total()
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{
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return TABLE::LINKS_TOTAL;
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}
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int links_max_cn()
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{
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return TABLE::LINKS_MAX_CN;
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}
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int bit_deg()
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{
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return bit_deg_;
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}
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int *acc_pos()
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{
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return acc_pos_;
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}
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void next_bit()
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{
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if (++row_cnt < M) {
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for (int i = 0; i < bit_deg_; ++i)
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acc_pos_[i] += q;
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for (int i = 0; i < bit_deg_; ++i)
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acc_pos_[i] %= R;
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} else {
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next_group();
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row_cnt = 0;
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}
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}
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void first_bit()
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{
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grp_num = 0;
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grp_len = 0;
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grp_cnt = 0;
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row_cnt = 0;
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row_ptr = TABLE::POS;
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next_group();
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}
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};
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LDPCInterface *create_ldpc(char *standard, char prefix, int number);
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} // namespace ldpctool
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#endif
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