Diff: ForwardErrCorr.cpp

Revision:

2:33b3b46a9c0d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ForwardErrCorr.cpp	Fri Sep 04 16:59:21 2020 +0000
@@ -0,0 +1,145 @@
+/*******************************************************************************
+* Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a
+* copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,
+* and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+* OTHER DEALINGS IN THE SOFTWARE.
+*
+* Except as contained in this notice, the name of Maxim Integrated
+* Products, Inc. shall not be used except as stated in the Maxim Integrated
+* Products, Inc. Branding Policy.
+*
+* The mere transfer of this software does not imply any licenses
+* of trade secrets, proprietary technology, copyrights, patents,
+* trademarks, maskwork rights, or any other form of intellectual
+* property whatsoever. Maxim Integrated Products, Inc. retains all
+* ownership rights.
+*******************************************************************************
+*/
+
+#include "ForwardErrCorr.h"
+
+Translator::Translator(char *SymmetricKey, char *TransTable): 
+m_SymmetricKey(SymmetricKey),m_TransTable(TransTable)
+{
+}
+
+//******************************************************************************
+Translator::~Translator(void){
+}
+
+//******************************************************************************
+uint32_t Translator::Decrypt(char *tes, uint16_t *Output){
+    int8_t ValOut,ValIn;
+    int key = 0;
+    Output[0] = 0;
+    printf("Recieved Data -> Decrypted Data:\r\n");
+    for(int i = 2;i<10;i++){
+        ValIn = tes[i];
+        ValIn = ValIn ^ m_SymmetricKey[key];      //Unencrypt data
+        printf("%c -> %i\r\n",ValIn,tes[i]);
+        key++;
+        ValOut = 5;
+        for (int j=0;j<4;j++){
+            if (ValIn == m_TransTable[j]){
+                ValOut = j;
+            }
+        }
+        if (ValOut == 5){
+            ValOut = ChkHam(ValIn);    
+        }
+        if (ValOut == 4){
+            printf("Transmission error -- Hamming Distance Collision\r\n");
+            return (1);
+        }
+        Output[0] = (Output[0] << 2) + ValOut;
+        printf("Output: %d\r\n",Output[0]);
+    }
+    return(0);
+}
+
+//******************************************************************************
+int Translator::ChkHam(char ChkVal){
+    char trial = ChkVal & 0x1F;
+    bool dupe = 0; 
+    int index, temp;
+    int min = 5;
+    for (int k = 0; k<4;k++){
+        temp = HamDist(trial,m_TransTable[k]);
+        if (temp == 1){
+            return (k);
+        }
+        else if (temp < min){
+            min = temp;
+            index = k;
+            dupe = 0;
+        }
+        else if (temp == min){
+            dupe = 1;
+        }
+    }
+    if (dupe == 1){
+        return(4);
+    }
+    else{
+        return (index);
+    }
+}
+
+//******************************************************************************
+int Translator::HamDist(char ChkVal, char TableVal){
+    int count=0;
+    char tes1,tes2;
+    for (int j =0;j<5;j++){
+        tes1 = ChkVal >> j;
+        tes2 = TableVal >> j;
+        char temp = tes1 ^ tes2;
+        count += temp&1;
+    }
+    return (count);
+}
+
+//******************************************************************************
+uint32_t Translator::Encrypt(uint16_t tempData,char *EncryptedData){
+    char data;
+    int z=0;
+    printf("FEC Encoded Data:\r\n");
+    for (int i=14;i>=0;i-=2){
+        data = ((tempData >> i)&0x03);
+        data = m_TransTable[data];
+        printf("%d  ",data);
+        data = (data ^ m_SymmetricKey[z]);
+        EncryptedData[z]=data;
+        z++;
+    }
+    printf("\r\n");
+    return(0);
+}
+
+//******************************************************************************
+uint32_t Translator::Encrypt(char tempData, char *EncryptedData){
+    char data;
+    int z =0;
+    for (int i=6;i>=0;i-=2){
+        data = ((tempData >> i)&0x03);
+        data = m_TransTable[data];
+        data = (data ^ m_SymmetricKey[z]);
+        EncryptedData[z] = data;
+        z++;
+    }
+    return(0);
+}