BitPacker.hpp

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 *  Author: Dula Nad
 *  Created: 29.04.2013.
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#ifndef BITPACKER_HPP_
#define BITPACKER_HPP_
#include <vector>
#include <cstdint>
#include <cassert>

//#include <bitset>
//#include <iostream>

namespace labust
{
        namespace tools
        {
                struct BitPacker
                {
                        template <class BitMapType, class DataType>
                        static uint64_t pack(const std::vector<BitMapType>& bitmap,
                                        const std::vector<DataType>& data)
                        {
                                uint64_t retVal(0);
                                assert(bitmap.size() == data.size() &&
                                                "The bitmap and data size have to be the same length.");

                                for (uint32_t i=0,j=1; i<bitmap.size(); ++i,++j)
                                {
                                        DataType bitmask = (1 << bitmap[i]) -1;
                                        retVal |= data[i] & bitmask;
                                        if (j < bitmap.size()) retVal <<= bitmap[j];
                                }

                                return retVal;
                        }

                        template <class BitMapType, class DataType>
                        static void unpack(uint64_t msg, const std::vector<BitMapType>& bitmap,
                                        std::vector<DataType>& data)
                        {
                                data.clear();
                                data.resize(bitmap.size());
                                for (int i=bitmap.size()-1; i>=0; --i)
                                {
                                        DataType bitmask = DataType(DataType(1) << bitmap[i]) -1;
                                        data[i]=(msg & bitmask);
                                        //std::cout<<"Unpacking message:"<<std::bitset<48>(msg)<<" with bitmap: "<<std::bitset<sizeof(DataType)*8>(bitmask)<<std::endl;
                                        msg >>= bitmap[i];
                                }
                        };

                        template <class BitMapType, class DataType>
                        static uint64_t pack_flipped(const std::vector<BitMapType>& bitmap,
                                        const std::vector<DataType>& data)
                        {
                                uint64_t retVal(0);
                                assert(bitmap.size() == data.size() &&
                                                "The bitmap and data size have to be the same length.");

                                for (int i=bitmap.size()-1,j=bitmap.size()-2; i>=0; --i,--j)
                                {
                                        DataType bitmask = (1 << bitmap[i]) -1;
                                        retVal |= data[i] & bitmask;
                                        if (j >= 0) retVal <<= bitmap[j];
                                }

                                return retVal;
                        }

                        template <class BitMapType, class DataType>
                        static void unpack_flipped(uint64_t msg, const std::vector<BitMapType>& bitmap,
                                        std::vector<DataType>& data)
                        {
                                data.clear();
                                for (uint32_t i=0; i<bitmap.size(); ++i)
                                {
                                        DataType bitmask = (1 << bitmap[i]) -1;
                                        data.push_back(msg & bitmask);
                                        msg >>= bitmap[i];
                                }
                        };
                };
        }
}
/* BITPACKER_HPP_ */
#endif