From e7ad2e1fab9c51189fdc8b4f2d81f625da9dd422 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Sat, 29 Oct 2016 22:09:13 +0200
Subject: Modernise PRBS generator and remove code for cmd line parser

---
 src/prbs.c | 140 -------------------------------------------------------------
 1 file changed, 140 deletions(-)
 delete mode 100644 src/prbs.c

(limited to 'src/prbs.c')

diff --git a/src/prbs.c b/src/prbs.c
deleted file mode 100644
index c29a830..0000000
--- a/src/prbs.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
-   Copyright (C) 2005, 2006, 2007, 2008, 2009 Her Majesty the Queen in Right
-   of Canada (Communications Research Center Canada)
-   */
-/*
-   This file is part of ODR-DabMux.
-
-   ODR-DabMux is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as
-   published by the Free Software Foundation, either version 3 of the
-   License, or (at your option) any later version.
-
-   ODR-DabMux is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
-   */
-
-#include "prbs.h"
-
-#include <string.h>
-#include <stdlib.h>
-#include <limits.h>
-
-
-/*
- * Generate a parity check for a 32-bit word.
- */
-unsigned long parity_check(unsigned long prbs_accum)
-{
-    unsigned long mask=1UL, parity=0UL;
-    int i;
-    for (i = 0;  i < 32;  ++i) {
-        parity ^= ((prbs_accum & mask) != 0UL);
-        mask <<= 1;
-    }
-    return parity;
-}
-
-/*
- * Generate a table of matrix products to update a 32-bit PRBS generator.
- */
-void gen_prbs_table(void* args)
-{
-    prbs_data* data = (prbs_data*)args;
-    int i;
-    for (i = 0;  i < 4;  ++i) {
-        int j;
-        for (j = 0;  j < 256;  ++j) {
-            unsigned long prbs_accum = ((unsigned long)j << (i * 8));
-            int k;
-            for (k = 0;  k < 8;  ++k) {
-                prbs_accum = (prbs_accum << 1)
-                                ^ parity_check(prbs_accum & data->polynomial);
-            }
-            data->prbs_table[i][j] = (prbs_accum & 0xff);
-        }
-    }
-}
-
-/*
- * Update a 32-bit PRBS generator eight bits at a time.
- */
-unsigned long update_prbs(void* args)
-{
-    prbs_data* data = (prbs_data*)args;
-    unsigned char acc_lsb = 0;
-    int i;
-    for (i = 0;  i < 4;  ++i ) {
-        acc_lsb ^= data->prbs_table [i] [ (data->accum >> (i * 8) ) & 0xff ];
-    }
-    return (data->accum << 8) ^ ((unsigned long)acc_lsb);
-}
-
-/*
- * Generate the weight table.
- */
-void gen_weight_table(void* args)
-{
-    prbs_data* data = (prbs_data*)args; 
-    int i;
-    for (i = 0;  i < 256;  ++i) {
-        unsigned char mask=1U, ones_count = 0U;
-        int j;
-        for (j = 0;  j < 8;  ++j) {
-            ones_count += ((i & mask) != 0U);
-            mask = mask << 1;
-        }
-        data->weight[i] = ones_count;
-    }
-}
-
-/*
- * Count the number of errors in a block of received data.
- */
-unsigned long error_count(void* args, unsigned char *rx_data,
-        int rx_data_length)
-{
-    prbs_data* data = (prbs_data*)args;
-    unsigned long error_count = 0U;
-    unsigned long prbs_accum = 0U;
-    int i;
-
-    /* seed the PRBS accumulator */
-    for (i = 0;  i < 4;  ++i) {
-        prbs_accum = (prbs_accum << 8) ^ (rx_data[i] ^ data->polarity_mask);
-    }
-
-    /* check the received data */
-    for (i = 0;  i < rx_data_length;  ++i) {
-        unsigned char error_pattern = (unsigned char)
-                          ((prbs_accum >> 24)
-                          ^ (rx_data[i] ^ data->polarity_mask));
-        if (error_pattern != 0U) {
-            error_count += data->weight[error_pattern];
-        }
-        prbs_accum = update_prbs(data);
-    }
-    return error_count;
-}
-
-void gen_sequence(void* args, unsigned char *tx_data, int tx_data_length,
-        unsigned long polynomial)
-{
-    prbs_data* data = (prbs_data*)args;
-    unsigned long prbs_accum = 0U;
-
-    while (prbs_accum < polynomial) {
-        prbs_accum <<= 1;
-        prbs_accum |= 1;
-    }
-
-    while (tx_data_length-- > 0) {
-        prbs_accum = update_prbs(data);
-        *(tx_data++) = (unsigned char)(prbs_accum & 0xff);
-    }
-}
-- 
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