PhysicsTools/MVAComputer/src/BitSet.cc - master - githubmirror/cmssw

PhysicsTools/MVAComputer/src/BitSet.cc
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31 май 2019, 17:22
31 май 2019, 17:2288e58de
#include "PhysicsTools/MVAComputer/interface/BitSet.h"
#include "PhysicsTools/MVAComputer/interface/Calibration.h"

namespace PhysicsTools {

  BitSet::size_t BitSet::bits() const {
    static constexpr unsigned char byteBits[256] = {
        0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2,
        3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3,
        3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5,
        6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4,
        3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4,
        5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6,
        6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8};
    const unsigned char *begin = reinterpret_cast<const unsigned char *>(store);
    const unsigned char *end = reinterpret_cast<const unsigned char *>(store + bitsToWords(bits_));

    size_t bits = 0;
    for (const unsigned char *p = begin; p < end; p++)
      bits += byteBits[*p];

    return bits;
  }

  BitSet Calibration::convert(const Calibration::BitSet &bitSet) {
    PhysicsTools::BitSet::size_t size = bitSet.store.size();
    size = (size - 1) * 8 + (bitSet.bitsInLast + 7) % 8 + 1;

    PhysicsTools::BitSet result(size);
    for (PhysicsTools::BitSet::size_t i = 0; i < size; i++)
      result[i] = bitSet.store[i / 8] & (1 << (i % 8));

    return result;
  }

  Calibration::BitSet Calibration::convert(const PhysicsTools::BitSet &bitSet) {
    PhysicsTools::BitSet::size_t size = bitSet.size();
    PhysicsTools::BitSet::size_t bytes = (size + 7) / 8;

    Calibration::BitSet result;
    result.store.resize(bytes);
    result.bitsInLast = (size + 7) % 8 + 1;

    for (PhysicsTools::BitSet::size_t i = 0; i < size; i++)
      result.store[i / 8] |= bitSet[i] ? (1 << (i % 8)) : 0;

    return result;
  }

}  // namespace PhysicsTools