MdtHistCoder.h

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#include <stdint.h>
 
#include <array>
 
class MdtHistCoder {
public:
    enum { region = 0, layer = 1, crate_region = 2, crate = 3, phi = 4 };  // bitshifts
 
private:
    static constexpr std::array<uint16_t, 5> m_bitshift{{0, 2, 4, 6, 8}};  // region, layer, crate_region, crate, phi
    static constexpr std::array<uint16_t, 5> m_bitmask{{0x3, 0x3, 0x3, 0x3, 0xF}};
    // region (on two bits)
    // layer (on two bits)
    // crate_region (on two bits)
    // crate (on two bits)
    // phi (on four bits)
 
public:
    static uint16_t encode(const uint16_t regionIn, const uint16_t layerIn, const uint16_t phiIn, const uint16_t crate_regionIn,
                           const uint16_t crateIn) {
        uint16_t result = (regionIn & m_bitmask[region]) << m_bitshift[region] | (layerIn & m_bitmask[layer]) << m_bitshift[layer] |
                          (phiIn & m_bitmask[phi]) << m_bitshift[phi] |
                          (crate_regionIn & m_bitmask[crate_region]) << m_bitshift[crate_region] |
                          (crateIn & m_bitmask[crate]) << m_bitshift[crate];
 
        return result;
    }
 
    static uint16_t decode(const uint16_t value, const uint16_t field) { return (value >> m_bitshift[field]) & m_bitmask[field]; }
};