Osmocom GSM/GPRS/EGPRS transceiver, originally forked from OpenBTS transceiver. For building SDR based GSM BTS with osmo-bts-trx.
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/*
* Copyright 2008, 2009 Free Software Foundation, Inc.
*
* SPDX-License-Identifier: AGPL-3.0+
*
* This software is distributed under the terms of the GNU Affero Public License.
* See the COPYING file in the main directory for details.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "BitVector.h"
#include <iostream>
#include <stdio.h>
#include <sstream>
#include <math.h>
using namespace std;
/**
Apply a Galois polymonial to a binary sequence.
@param val The input sequence.
@param poly The polynomial.
@param order The order of the polynomial.
@return Single-bit result.
*/
unsigned applyPoly(uint64_t val, uint64_t poly, unsigned order)
{
uint64_t prod = val & poly;
unsigned sum = prod;
for (unsigned i=1; i<order; i++) sum ^= prod>>i;
return sum & 0x01;
}
BitVector::BitVector(const char *valString)
:Vector<char>(strlen(valString))
{
uint32_t accum = 0;
for (size_t i=0; i<size(); i++) {
accum <<= 1;
if (valString[i]=='1') accum |= 0x01;
mStart[i] = accum;
}
}
uint64_t BitVector::peekField(size_t readIndex, unsigned length) const
{
uint64_t accum = 0;
char *dp = mStart + readIndex;
assert(dp+length <= mEnd);
for (unsigned i=0; i<length; i++) {
accum = (accum<<1) | ((*dp++) & 0x01);
}
return accum;
}
uint64_t BitVector::peekFieldReversed(size_t readIndex, unsigned length) const
{
uint64_t accum = 0;
char *dp = mStart + readIndex + length - 1;
assert(dp<mEnd);
for (int i=(length-1); i>=0; i--) {
accum = (accum<<1) | ((*dp--) & 0x01);
}
return accum;
}
uint64_t BitVector::readField(size_t& readIndex, unsigned length) const
{
const uint64_t retVal = peekField(readIndex,length);
readIndex += length;
return retVal;
}
uint64_t BitVector::readFieldReversed(size_t& readIndex, unsigned length) const
{
const uint64_t retVal = peekFieldReversed(readIndex,length);
readIndex += length;
return retVal;
}
void BitVector::fillField(size_t writeIndex, uint64_t value, unsigned length)
{
char *dpBase = mStart + writeIndex;
char *dp = dpBase + length - 1;
assert(dp < mEnd);
while (dp>=dpBase) {
*dp-- = value & 0x01;
value >>= 1;
}
}
void BitVector::fillFieldReversed(size_t writeIndex, uint64_t value, unsigned length)
{
char *dp = mStart + writeIndex;
char *dpEnd = dp + length - 1;
assert(dpEnd < mEnd);
while (dp<=dpEnd) {
*dp++ = value & 0x01;
value >>= 1;
}
}
void BitVector::writeField(size_t& writeIndex, uint64_t value, unsigned length)
{
fillField(writeIndex,value,length);
writeIndex += length;
}
void BitVector::writeFieldReversed(size_t& writeIndex, uint64_t value, unsigned length)
{
fillFieldReversed(writeIndex,value,length);
writeIndex += length;
}
void BitVector::invert()
{
for (size_t i=0; i<size(); i++) {
mStart[i] = ~mStart[i];
}
}
void BitVector::reverse8()
{
assert(size()>=8);
char tmp0 = mStart[0];
mStart[0] = mStart[7];
mStart[7] = tmp0;
char tmp1 = mStart[1];
mStart[1] = mStart[6];
mStart[6] = tmp1;
char tmp2 = mStart[2];
mStart[2] = mStart[5];
mStart[5] = tmp2;
char tmp3 = mStart[3];
mStart[3] = mStart[4];
mStart[4] = tmp3;
}
void BitVector::LSB8MSB()
{
if (size()<8) return;
size_t size8 = 8*(size()/8);
size_t iTop = size8 - 8;
for (size_t i=0; i<=iTop; i+=8) segment(i,8).reverse8();
}
unsigned BitVector::sum() const
{
unsigned sum = 0;
for (size_t i=0; i<size(); i++) sum += mStart[i] & 0x01;
return sum;
}
void BitVector::map(const unsigned *map, size_t mapSize, BitVector& dest) const
{
for (unsigned i=0; i<mapSize; i++) {
dest.mStart[i] = mStart[map[i]];
}
}
void BitVector::unmap(const unsigned *map, size_t mapSize, BitVector& dest) const
{
for (unsigned i=0; i<mapSize; i++) {
dest.mStart[map[i]] = mStart[i];
}
}
ostream& operator<<(ostream& os, const BitVector& hv)
{
for (size_t i=0; i<hv.size(); i++) {
if (hv.bit(i)) os << '1';
else os << '0';
}
return os;
}
SoftVector::SoftVector(const BitVector& source)
{
resize(source.size());
for (size_t i=0; i<size(); i++) {
if (source.bit(i)) mStart[i]=1.0F;
else mStart[i]=-1.0F;
}
}
BitVector SoftVector::sliced() const
{
size_t sz = size();
BitVector newSig(sz);
for (size_t i=0; i<sz; i++) {
if (mStart[i]>0.0F) newSig[i]=1;
else newSig[i] = 0;
}
return newSig;
}
float SoftVector::getEnergy(float *plow) const
{
const SoftVector &vec = *this;
int len = vec.size();
float avg = 0; float low = 1;
for (int i = 0; i < len; i++) {
float energy = fabsf(vec[i]);
if (energy < low) low = energy;
avg += energy/len;
}
if (plow) { *plow = low; }
return avg;
}
ostream& operator<<(ostream& os, const SoftVector& sv)
{
for (size_t i=0; i<sv.size(); i++) {
if (sv[i]<-0.5) os << "0";
else if (sv[i]<-0.25) os << "o";
else if (sv[i]<0.0) os << ".";
else if (sv[i]>0.5) os << "1";
else if (sv[i]>0.25) os << "|";
else if (sv[i]>0.0) os << "'";
else os << "-";
}
return os;
}
void BitVector::pack(unsigned char* targ) const
{
// Assumes MSB-first packing.
unsigned bytes = size()/8;
for (unsigned i=0; i<bytes; i++) {
targ[i] = peekField(i*8,8);
}
unsigned whole = bytes*8;
unsigned rem = size() - whole;
if (rem==0) return;
targ[bytes] = peekField(whole,rem) << (8-rem);
}
void BitVector::unpack(const unsigned char* src)
{
// Assumes MSB-first packing.
unsigned bytes = size()/8;
for (unsigned i=0; i<bytes; i++) {
fillField(i*8,src[i],8);
}
unsigned whole = bytes*8;
unsigned rem = size() - whole;
if (rem==0) return;
fillField(whole,src[bytes] >> (8-rem),rem);
}
void BitVector::hex(ostream& os) const
{
os << std::hex;
unsigned digits = size()/4;
size_t wp=0;
for (unsigned i=0; i<digits; i++) {
os << readField(wp,4);
}
os << std::dec;
}
std::string BitVector::hexstr() const
{
std::ostringstream ss;
hex(ss);
return ss.str();
}
bool BitVector::unhex(const char* src)
{
// Assumes MSB-first packing.
unsigned int val;
unsigned digits = size()/4;
for (unsigned i=0; i<digits; i++) {
if (sscanf(src+i, "%1x", &val) < 1) {
return false;
}
fillField(i*4,val,4);
}
unsigned whole = digits*4;
unsigned rem = size() - whole;
if (rem>0) {
if (sscanf(src+digits, "%1x", &val) < 1) {
return false;
}
fillField(whole,val,rem);
}
return true;
}
// vim: ts=4 sw=4