526 lines
11 KiB
C++
526 lines
11 KiB
C++
/*
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* Copyright 2008, 2009, 2014 Free Software Foundation, Inc.
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* Copyright 2014 Range Networks, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* This use of this software may be subject to additional restrictions.
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* See the LEGAL file in the main directory for details.
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*/
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#include "BitVector.h"
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#include <iostream>
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#include <stdio.h>
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#include <sstream>
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#include <string.h>
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//#include <Logger.h>
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using namespace std;
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BitVector::BitVector(const char *valString)
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{
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// 1-30-2013 pat: I dont know what this was intended to do, but it did not create a normalized BitVector,
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// and it could even fail if the accum overlows 8 bits.
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//uint32_t accum = 0;
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//for (size_t i=0; i<size(); i++) {
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// accum <<= 1;
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// if (valString[i]=='1') accum |= 0x01;
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// mStart[i] = accum;
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//}
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vInit(strlen(valString));
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char *rp = begin();
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for (const char *cp = valString; *cp; cp++, rp++) {
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*rp = (*cp == '1');
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}
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}
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uint64_t BitVector::peekField(size_t readIndex, unsigned length) const
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{
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uint64_t accum = 0;
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char *dp = mStart + readIndex;
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for (unsigned i=0; i<length; i++) {
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accum = (accum<<1) | ((*dp++) & 0x01);
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}
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return accum;
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}
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uint64_t BitVector::peekFieldReversed(size_t readIndex, unsigned length) const
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{
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uint64_t accum = 0;
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char *dp = mStart + readIndex + length - 1;
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assert(dp<mEnd);
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for (int i=(length-1); i>=0; i--) {
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accum = (accum<<1) | ((*dp--) & 0x01);
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}
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return accum;
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}
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uint64_t BitVector::readField(size_t& readIndex, unsigned length) const
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{
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const uint64_t retVal = peekField(readIndex,length);
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readIndex += length;
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return retVal;
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}
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uint64_t BitVector::readFieldReversed(size_t& readIndex, unsigned length) const
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{
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const uint64_t retVal = peekFieldReversed(readIndex,length);
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readIndex += length;
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return retVal;
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}
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void BitVector::fillField(size_t writeIndex, uint64_t value, unsigned length)
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{
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if (length != 0) {
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char *dpBase = mStart + writeIndex;
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char *dp = dpBase + length - 1;
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assert(dp < mEnd);
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while (dp>=dpBase) {
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*dp-- = value & 0x01;
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value >>= 1;
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}
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}
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}
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void BitVector::fillFieldReversed(size_t writeIndex, uint64_t value, unsigned length)
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{
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if (length != 0) {
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char *dp = mStart + writeIndex;
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char *dpEnd = dp + length - 1;
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assert(dpEnd < mEnd);
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while (dp<=dpEnd) {
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*dp++ = value & 0x01;
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value >>= 1;
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}
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}
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}
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void BitVector::writeField(size_t& writeIndex, uint64_t value, unsigned length)
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{
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if (length != 0) {
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fillField(writeIndex,value,length);
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writeIndex += length;
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}
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}
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void BitVector::writeFieldReversed(size_t& writeIndex, uint64_t value, unsigned length)
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{
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if (length != 0) {
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fillFieldReversed(writeIndex,value,length);
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writeIndex += length;
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}
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}
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void BitVector::invert()
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{
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for (size_t i=0; i<size(); i++) {
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mStart[i] = ~mStart[i];
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}
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}
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void BitVector::reverse8()
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{
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assert(size()>=8);
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char tmp0 = mStart[0];
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mStart[0] = mStart[7];
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mStart[7] = tmp0;
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char tmp1 = mStart[1];
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mStart[1] = mStart[6];
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mStart[6] = tmp1;
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char tmp2 = mStart[2];
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mStart[2] = mStart[5];
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mStart[5] = tmp2;
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char tmp3 = mStart[3];
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mStart[3] = mStart[4];
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mStart[4] = tmp3;
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}
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void BitVector::LSB8MSB()
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{
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if (size()<8) return;
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size_t size8 = 8*(size()/8);
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size_t iTop = size8 - 8;
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for (size_t i=0; i<=iTop; i+=8) segment(i,8).reverse8();
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}
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uint64_t BitVector::syndrome(Generator& gen) const
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{
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gen.clear();
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const char *dp = mStart;
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while (dp<mEnd) gen.syndromeShift(*dp++);
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return gen.state();
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}
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uint64_t BitVector::parity(Generator& gen) const
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{
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gen.clear();
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const char *dp = mStart;
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while (dp<mEnd) gen.encoderShift(*dp++);
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return gen.state();
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}
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unsigned BitVector::sum() const
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{
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unsigned sum = 0;
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for (size_t i=0; i<size(); i++) sum += mStart[i] & 0x01;
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return sum;
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}
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void BitVector::map(const unsigned *map, size_t mapSize, BitVector& dest) const
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{
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for (unsigned i=0; i<mapSize; i++) {
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dest.mStart[i] = mStart[map[i]];
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}
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}
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void BitVector::unmap(const unsigned *map, size_t mapSize, BitVector& dest) const
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{
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for (unsigned i=0; i<mapSize; i++) {
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dest.mStart[map[i]] = mStart[i];
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}
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}
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ostream& operator<<(ostream& os, const BitVector& hv)
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{
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for (size_t i=0; i<hv.size(); i++) {
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if (hv.bit(i)) os << '1';
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else os << '0';
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}
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return os;
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}
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uint64_t Parity::syndrome(const BitVector& receivedCodeword)
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{
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return receivedCodeword.syndrome(*this);
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}
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void Parity::writeParityWord(const BitVector& data, BitVector& parityTarget, bool invert)
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{
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uint64_t pWord = data.parity(*this);
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if (invert) pWord = ~pWord;
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parityTarget.fillField(0,pWord,size());
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}
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SoftVector::SoftVector(const BitVector& source)
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{
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resize(source.size());
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for (size_t i=0; i<size(); i++) {
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if (source.bit(i)) mStart[i]=1.0F;
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else mStart[i]=0.0F;
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}
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}
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BitVector SoftVector::sliced() const
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{
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size_t sz = size();
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BitVector newSig(sz);
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for (size_t i=0; i<sz; i++) {
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if (mStart[i]>0.5F) newSig[i]=1;
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else newSig[i] = 0;
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}
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return newSig;
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}
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// (pat) Added 6-22-2012
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float SoftVector::getEnergy(float *plow) const
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{
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const SoftVector &vec = *this;
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int len = vec.size();
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float avg = 0; float low = 1;
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for (int i = 0; i < len; i++) {
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float bit = vec[i];
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float energy = 2*((bit < 0.5) ? (0.5-bit) : (bit-0.5));
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if (energy < low) low = energy;
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avg += energy/len;
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}
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if (plow) { *plow = low; }
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return avg;
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}
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// (pat) Added 1-2014. Compute SNR of a soft vector. Very similar to above.
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// Since we dont really know what the expected signal values are, we will assume that the signal is 0 or 1
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// and return the SNR on that basis.
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// SNR is power(signal) / power(noise) where power can be calculated as (RMS(signal) / RMS(noise))**2 of the values.
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// Since RMS is square-rooted, ie RMS = sqrt(1/n * (x1**2 + x2**2 ...)), we just add up the squares.
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// To compute RMS of the signal we will remove any constant offset, so the signal values are either 0.5 or -0.5,
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// so the RMS of the signal is just 0.5**2 * len; all we need to compute is the noise component.
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float SoftVector::getSNR() const
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{
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float sumSquaresNoise = 0;
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const SoftVector &vec = *this;
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int len = vec.size();
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if (len == 0) { return 0.0; }
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for (int i = 0; i < len; i++) {
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float bit = vec[i];
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if (bit < 0.5) {
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// Assume signal is 0.
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sumSquaresNoise += (bit - 0.0) * (bit - 0.0);
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} else {
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// Assume signal is 1.
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sumSquaresNoise += (bit - 1.0) * (bit - 1.0);
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}
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}
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float sumSquaresSignal = 0.5 * 0.5 * len;
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// I really want log10 of this to convert to dB, but log is expensive, and Harvind seems to like absolute SNR.
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// Clamp max to 999; it shouldnt get up there but be sure. This also avoids divide by zero.
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if (sumSquaresNoise * 1000 < sumSquaresSignal) return 999;
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return sumSquaresSignal / sumSquaresNoise;
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}
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ostream& operator<<(ostream& os, const SoftVector& sv)
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{
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for (size_t i=0; i<sv.size(); i++) {
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if (sv[i]<0.25) os << "0";
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else if (sv[i]>0.75) os << "1";
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else os << "-";
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}
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return os;
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}
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void BitVector::pack(unsigned char* targ) const
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{
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// Assumes MSB-first packing.
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unsigned bytes = size()/8;
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for (unsigned i=0; i<bytes; i++) {
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targ[i] = peekField(i*8,8);
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}
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unsigned whole = bytes*8;
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unsigned rem = size() - whole;
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if (rem==0) return;
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targ[bytes] = peekField(whole,rem) << (8-rem);
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}
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void BitVector::pack2(unsigned char* targ) const
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{
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unsigned int i;
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unsigned char curbyte = 0;
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for (i = 0; i < size(); i++)
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{
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uint8_t bitnum = 7 - (i % 8);
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curbyte |= ((char)bit(i) << bitnum);
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if(i % 8 == 7){
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*targ++ = curbyte;
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curbyte = 0;
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}
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}
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// Assumes MSB-first packing.
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// unsigned bytes = size()/8;
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// for (unsigned i=0; i<bytes; i++) {
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// targ[i] = peekField(i*8,8);
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// }
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// unsigned whole = bytes*8;
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// unsigned rem = size() - whole;
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// if (rem==0) return;
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// targ[bytes] = peekField(whole,rem) << (8-rem);
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}
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string BitVector::packToString() const
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{
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string result;
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result.reserve((size()+7)/8);
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// Tempting to call this->pack(result.c_str()) but technically c_str() is read-only.
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unsigned bytes = size()/8;
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for (unsigned i=0; i<bytes; i++) {
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result.push_back(peekField(i*8,8));
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}
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unsigned whole = bytes*8;
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unsigned rem = size() - whole;
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if (rem==0) return result;
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result.push_back(peekField(whole,rem) << (8-rem));
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return result;
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}
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void BitVector::unpack(const unsigned char* src)
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{
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// Assumes MSB-first packing.
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unsigned bytes = size()/8;
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for (unsigned i=0; i<bytes; i++) {
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fillField(i*8,src[i],8);
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}
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unsigned whole = bytes*8;
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unsigned rem = size() - whole;
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if (rem==0) return;
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fillField(whole,src[bytes] >> (8-rem),rem);
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}
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void BitVector::hex(ostream& os) const
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{
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os << std::hex;
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unsigned digits = size()/4;
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size_t wp=0;
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for (unsigned i=0; i<digits; i++) {
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os << readField(wp,4);
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}
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os << std::dec;
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}
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std::string BitVector::hexstr() const
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{
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std::ostringstream ss;
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hex(ss);
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return ss.str();
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}
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bool BitVector::unhex(const char* src)
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{
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// Assumes MSB-first packing.
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unsigned int val;
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unsigned digits = size()/4;
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for (unsigned i=0; i<digits; i++) {
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if (sscanf(src+i, "%1x", &val) < 1) {
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return false;
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}
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fillField(i*4,val,4);
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}
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unsigned whole = digits*4;
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unsigned rem = size() - whole;
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if (rem>0) {
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if (sscanf(src+digits, "%1x", &val) < 1) {
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return false;
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}
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fillField(whole,val,rem);
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}
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return true;
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}
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bool BitVector::operator==(const BitVector &other) const
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{
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unsigned l = size();
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return l == other.size() && 0==memcmp(begin(),other.begin(),l);
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}
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void BitVector::copyPunctured(BitVector &dst, const unsigned *puncture, const size_t plth)
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{
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assert(size() - plth == dst.size());
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char *srcp = mStart;
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char *dstp = dst.mStart;
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const unsigned *pend = puncture + plth;
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while (srcp < mEnd) {
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if (puncture < pend) {
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int n = (*puncture++) - (srcp - mStart);
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assert(n >= 0);
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for (int i = 0; i < n; i++) {
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assert(srcp < mEnd && dstp < dst.mEnd);
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*dstp++ = *srcp++;
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}
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srcp++;
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} else {
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while (srcp < mEnd) {
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assert(dstp < dst.mEnd);
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*dstp++ = *srcp++;
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}
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}
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}
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assert(dstp == dst.mEnd && puncture == pend);
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}
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void SoftVector::copyUnPunctured(SoftVector &dst, const unsigned *puncture, const size_t plth)
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{
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assert(size() + plth == dst.size());
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float *srcp = mStart;
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float *dstp = dst.mStart;
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const unsigned *pend = puncture + plth;
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while (dstp < dst.mEnd) {
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if (puncture < pend) {
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int n = (*puncture++) - (dstp - dst.mStart);
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assert(n >= 0);
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for (int i = 0; i < n; i++) {
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assert(srcp < mEnd && dstp < dst.mEnd);
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*dstp++ = *srcp++;
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}
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*dstp++ = 0.5;
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} else {
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while (srcp < mEnd) {
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assert(dstp < dst.mEnd);
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*dstp++ = *srcp++;
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}
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}
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}
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assert(dstp == dst.mEnd && puncture == pend);
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}
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// vim: ts=4 sw=4
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