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//===================================================================
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// Module Name : RsDecodeErasureEmulator
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// File Name : RsDecodeErasureEmulator.cpp
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// Function : RS Decoder erasure emulator
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//
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// Revision History:
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// Date By Version Change Description
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//===================================================================
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// 2009/02/03 Gael Sapience 1.0 Original
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//
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//===================================================================
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// (C) COPYRIGHT 2009 SYSTEM LSI CO., Ltd.
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//
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#include <stdio.h>
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#include <stdlib.h>
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#include <iostream>
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//FILE *OutFileErasureDebug;
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void RsGfMultiplier( int*, int*,int*, int, int);
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void RsDecodeErasureEmulator(int failErasure, int numErasure, int *epsilonRegTab, int DataSize, int TotalSize, int PrimPoly, int bitSymbol, int *MrefTab, int *PrefTab, int *erasureTab) {
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//---------------------------------------------------------------
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//---------------------------------------------------------------
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// OutFileErasureDebug = fopen("RsEmulatorErasureDebug.txt","w");
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//---------------------------------------------------------------
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// C++ variables
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//---------------------------------------------------------------
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int syndromeLength;
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int ii, kk, zz ,aa;
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int Pidx;
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int init;
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int idx2;
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int idx1;
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int mmTabSize = (bitSymbol*2) -1;
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int tempNum;
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int tempix;
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int MaxValue;
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int initValue;
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int numErasureWidth;
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syndromeLength = TotalSize - DataSize;
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int *powerInitialNewTab;
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int *powerNewTab;
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int *bbTab;
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int *ppTab;
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int *ttTab;
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int *erasureInitialPowerTab;
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int *powerRegTab;
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int *powerTab;
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int *bidon;
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int *tempixTab;
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int *numErasureBinary;
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powerInitialNewTab = new int[bitSymbol*bitSymbol];
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powerNewTab = new int[bitSymbol*bitSymbol];
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bbTab = new int[bitSymbol];
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ppTab = new int[bitSymbol];
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ttTab = new int[bitSymbol];
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bidon = new int[bitSymbol];
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tempixTab = new int[bitSymbol];
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erasureInitialPowerTab = new int[bitSymbol];
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powerRegTab = new int[bitSymbol];
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powerTab = new int[bitSymbol];
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numErasureBinary = new int[bitSymbol];
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//---------------------------------------------------------------
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// MaxValue calculation
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//---------------------------------------------------------------
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MaxValue = 2;
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for(ii=0; ii<(bitSymbol-1); ii++){
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MaxValue = MaxValue*2;
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}
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//---------------------------------------------------------------
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// param1 calculation
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//---------------------------------------------------------------
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int param1 = MaxValue - TotalSize;
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//---------------------------------------------------------------
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// powerTab calculation
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//---------------------------------------------------------------
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powerTab[0] = 1;
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for (ii=1; ii<bitSymbol;ii++){
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powerTab[ii] = 2*powerTab[ii-1];
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}
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//---------------------------------------------------------------
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// initialize ttTab
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//---------------------------------------------------------------
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ttTab[0] = 1;
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for (ii=1;ii<bitSymbol;ii++){
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ttTab[ii] = 0;
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}
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//---------------------------------------------------------------
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// initialize bbTab
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//---------------------------------------------------------------
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bbTab[0] = 0;
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bbTab[1] = 1;
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for (ii=2;ii<bitSymbol;ii++){
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bbTab[ii] = 0;
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}
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//---------------------------------------------------------------
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//---------------------------------------------------------------
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for (ii=1;ii < (param1+1);ii++){
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RsGfMultiplier(ppTab, ttTab, bbTab, PrimPoly, bitSymbol);
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for (kk=0; kk<bitSymbol;kk++){
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ttTab[kk] = ppTab[kk];
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}
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}
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initValue = 0;
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for (kk=0; kk<bitSymbol;kk++){
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initValue = initValue + ttTab[kk] * powerTab[kk];
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erasureInitialPowerTab [kk] = ttTab[kk];
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}
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//------------------------------------------------------------------------
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// RsDecodeMakeMultErasure Emulation
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//------------------------------------------------------------------------
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ttTab[0] = 1;
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for (ii=1;ii<bitSymbol;ii++){
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ttTab[ii] = 0;
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}
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bbTab[0] = 0;
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bbTab[1] = 1;
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for (ii=2;ii<bitSymbol;ii++){
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bbTab[ii] = 0;
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}
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//------------------------------------------------------------------------
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// ppTab = ttTab * bbTab
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//------------------------------------------------------------------------
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RsGfMultiplier(ppTab, ttTab, bbTab, PrimPoly, bitSymbol);
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//------------------------------------------------------------------------
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// reassign ttTab
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//------------------------------------------------------------------------
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for (kk=0; kk<bitSymbol;kk++){
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ttTab[kk] = ppTab[kk];
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}
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//------------------------------------------------------------------------
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// initialize powerInitialNewTab
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//------------------------------------------------------------------------
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for (kk=0; kk<bitSymbol*bitSymbol;kk++){
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powerInitialNewTab[kk] = 0;
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}
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//------------------------------------------------------------------------
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// powerInitialNewTab generation
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//------------------------------------------------------------------------
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for (Pidx=0; Pidx<bitSymbol; Pidx++){
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init = 0;
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for (idx2=0; idx2<bitSymbol;idx2++){
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bidon [idx2] = 0;
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}
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for (idx1=0; idx1<mmTabSize;idx1++){
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tempNum = PrefTab [Pidx*mmTabSize+idx1];
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if (tempNum == 1) {
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//------------------------------------------------------------------------
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// search
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//------------------------------------------------------------------------
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for (idx2=0; idx2<bitSymbol;idx2++){
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tempNum = MrefTab[idx1*bitSymbol+idx2];
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if ((tempNum > 0) && (ttTab[tempNum-1] == 1)) {
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if (bidon [idx2] == 0) {
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bidon [idx2] = 1;
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}
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else {
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bidon [idx2] = 0;
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}
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}
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}
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}
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}
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//------------------------------------------------------------------------
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// printf
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//------------------------------------------------------------------------
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for (idx2=0; idx2<bitSymbol; idx2++){
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if (bidon[idx2] == 1) {
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powerInitialNewTab [Pidx*bitSymbol + idx2] = 1;
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}
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}
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}
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//------------------------------------------------------------------------
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// initialize powerNewTab
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//------------------------------------------------------------------------
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for (kk=0; kk<bitSymbol*bitSymbol;kk++){
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powerNewTab[kk] = 0;
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}
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//------------------------------------------------------------------------
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// powerNewTab generation
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//------------------------------------------------------------------------
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for (Pidx=0; Pidx<bitSymbol; Pidx++){
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init = 0;
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for (idx2=0; idx2<bitSymbol;idx2++){
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bidon [idx2] = 0;
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}
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for (idx1=0; idx1<mmTabSize;idx1++){
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tempNum = PrefTab [Pidx*mmTabSize+idx1];
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if (tempNum == 1) {
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//------------------------------------------------------------------------
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// search
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//------------------------------------------------------------------------
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for (idx2=0; idx2<bitSymbol;idx2++){
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tempNum = MrefTab[idx1*bitSymbol+idx2];
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if ((tempNum > 0) && (ttTab[tempNum-1] == 1)) {
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if (bidon [idx2] == 0) {
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bidon [idx2] = 1;
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}
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else {
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bidon [idx2] = 0;
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}
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}
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}
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}
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}
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//------------------------------------------------------------------------
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// printf
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//------------------------------------------------------------------------
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for (idx2=0; idx2<bitSymbol; idx2++){
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if (bidon[idx2] == 1) {
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powerNewTab[Pidx*bitSymbol+idx2] = 1;
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}
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}
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}
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//---------------------------------------------------------------
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// initialize epsilonRegTab
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//---------------------------------------------------------------
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for (kk=0; kk<((syndromeLength+1)*bitSymbol); kk++){
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epsilonRegTab[kk] = 0;
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}
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//---------------------------------------------------------------
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// calculate epsilonRegTab
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//---------------------------------------------------------------
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for (kk=0; kk<TotalSize; kk++){
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//---------------------------------------------------------------
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// sync
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//---------------------------------------------------------------
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if (kk == 0){
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if (erasureTab[0] == 1){
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for (zz=0;zz<bitSymbol;zz++){
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epsilonRegTab[zz] = erasureInitialPowerTab [zz];
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}
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epsilonRegTab[bitSymbol] = 1;
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}else{
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epsilonRegTab[0] = 1;
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}
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for (zz=0;zz<bitSymbol;zz++){
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powerRegTab [zz] = 0;
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for (aa=0;aa<bitSymbol;aa++){
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powerRegTab [zz] = powerRegTab [zz] ^ (erasureInitialPowerTab[aa] & powerInitialNewTab[zz*bitSymbol+aa]);
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}
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}
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for (zz=0; zz<syndromeLength; zz++){
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tempNum = 0;
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for (aa=0; aa<bitSymbol; aa++){
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tempNum = tempNum + epsilonRegTab[zz*bitSymbol+aa] * powerTab[aa];
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}
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}
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} else {
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//---------------------------------------------------------------
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// NOT sync
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//---------------------------------------------------------------
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if (erasureTab[kk] == 1){
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for (zz=syndromeLength; zz>=0; zz--){
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for (aa=0; aa<bitSymbol; aa++){
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bbTab[aa] = epsilonRegTab[zz*bitSymbol+aa];
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}
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RsGfMultiplier(ppTab, powerRegTab, bbTab, PrimPoly, bitSymbol);
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if (zz>0){
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for (aa=0; aa<bitSymbol; aa++){
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epsilonRegTab[zz*bitSymbol+aa] = epsilonRegTab[(zz-1)*bitSymbol+aa] ^ ppTab[aa];
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}
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}else{
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//---------------------------------------------------------------
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// epsilonReg0
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//---------------------------------------------------------------
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for (aa=0; aa<bitSymbol; aa++){
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epsilonRegTab[zz*bitSymbol+aa] = ppTab[aa];
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}
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}
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}
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}
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//---------------------------------------------------------------
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// update powerReg
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//---------------------------------------------------------------
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for (zz=0;zz<bitSymbol;zz++){
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tempixTab[zz] = powerRegTab [zz];
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}
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for (zz=0;zz<bitSymbol;zz++){
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powerRegTab [zz] = 0;
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for (aa=0;aa<bitSymbol;aa++){
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powerRegTab [zz] = powerRegTab [zz] ^ (tempixTab [aa] & powerNewTab[zz*bitSymbol+aa]);
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}
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}
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}
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}
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//---------------------------------------------------------------
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// calculate numErasure
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//---------------------------------------------------------------
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numErasure = 0;
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for (kk=0; kk<TotalSize; kk++){
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if (erasureTab [kk] == 1) {
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numErasure = numErasure + 1;
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}
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}
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//---------------------------------------------------------------
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// convert numErasure (Decimal to binary)
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//---------------------------------------------------------------
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tempix = numErasure;
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for (zz =bitSymbol-1; zz>=0;zz--) {
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if (tempix >= powerTab[zz]) {
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tempix = tempix - powerTab[zz];
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numErasureBinary [zz] = 1;
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}else{
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numErasureBinary [zz] = 0;
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}
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}
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//---------------------------------------------------------------
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// numErasureWidth: allowed size for numErasure register
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//---------------------------------------------------------------
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if (syndromeLength > 2047) {
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numErasureWidth = 12;
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}else{
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if (syndromeLength > 1023) {
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numErasureWidth = 11;
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}else{
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if (syndromeLength > 511) {
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numErasureWidth = 10;
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}else{
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if (syndromeLength > 255) {
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numErasureWidth = 9;
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}else{
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if (syndromeLength > 127) {
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numErasureWidth = 8;
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}else{
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381 |
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if (syndromeLength > 63) {
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numErasureWidth = 7;
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}else{
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384 |
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if (syndromeLength > 31){
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numErasureWidth = 6;
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}else{
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387 |
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if (syndromeLength > 15){
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numErasureWidth = 5;
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389 |
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}else{
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390 |
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if (syndromeLength > 7){
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|
|
numErasureWidth = 4;
|
392 |
|
|
}else{
|
393 |
|
|
if (syndromeLength > 3){
|
394 |
|
|
numErasureWidth = 3;
|
395 |
|
|
}else{
|
396 |
|
|
numErasureWidth = 2;
|
397 |
|
|
}
|
398 |
|
|
}
|
399 |
|
|
}
|
400 |
|
|
}
|
401 |
|
|
}
|
402 |
|
|
}
|
403 |
|
|
}
|
404 |
|
|
}
|
405 |
|
|
}
|
406 |
|
|
}
|
407 |
|
|
|
408 |
|
|
|
409 |
|
|
//---------------------------------------------------------------
|
410 |
|
|
//---------------------------------------------------------------
|
411 |
|
|
// fprintf(OutFileErasureDebug, "numErasure = %d\n", numErasure);
|
412 |
|
|
// fprintf(OutFileErasureDebug, "numErasureWidth = %d\n", numErasureWidth);
|
413 |
|
|
// fprintf(OutFileErasureDebug, "numErasureBinary = ");
|
414 |
|
|
// for (zz =0; zz<bitSymbol;zz++) {
|
415 |
|
|
// fprintf(OutFileErasureDebug, "%d_", numErasureBinary[zz]);
|
416 |
|
|
// }
|
417 |
|
|
// fprintf(OutFileErasureDebug, "\n");
|
418 |
|
|
|
419 |
|
|
|
420 |
|
|
//---------------------------------------------------------------
|
421 |
|
|
// adjust numErasure to numErasureWidth size
|
422 |
|
|
//---------------------------------------------------------------
|
423 |
|
|
numErasure = 0;
|
424 |
|
|
|
425 |
|
|
for (zz = 0; zz <numErasureWidth; zz++){
|
426 |
|
|
numErasure = numErasure + numErasureBinary[zz] * powerTab[zz];
|
427 |
|
|
}
|
428 |
|
|
|
429 |
|
|
// fprintf(OutFileErasureDebug, "numErasure Fixed = %d\n", numErasure);
|
430 |
|
|
|
431 |
|
|
//---------------------------------------------------------------
|
432 |
|
|
// calculate numErasure
|
433 |
|
|
//---------------------------------------------------------------
|
434 |
|
|
failErasure = 0;
|
435 |
|
|
|
436 |
|
|
if (numErasure > syndromeLength) {
|
437 |
|
|
failErasure = 1;
|
438 |
|
|
}
|
439 |
|
|
|
440 |
|
|
// fclose(OutFileErasureDebug);
|
441 |
|
|
|
442 |
|
|
|
443 |
|
|
//---------------------------------------------------------------
|
444 |
|
|
// Free memory
|
445 |
|
|
//---------------------------------------------------------------
|
446 |
|
|
delete[] powerInitialNewTab;
|
447 |
|
|
delete[] powerNewTab;
|
448 |
|
|
delete[] bbTab;
|
449 |
|
|
delete[] ppTab;
|
450 |
|
|
delete[] ttTab;
|
451 |
|
|
delete[] erasureInitialPowerTab;
|
452 |
|
|
delete[] powerRegTab;
|
453 |
|
|
delete[] powerTab;
|
454 |
|
|
delete[] bidon;
|
455 |
|
|
delete[] tempixTab;
|
456 |
|
|
delete[] numErasureBinary;
|
457 |
|
|
|
458 |
|
|
}
|