MHO_MD5HashGenerator.hh

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#ifndef MHO_MD5HashGenerator_HH__
#define MHO_MD5HashGenerator_HH__
 
#include <complex>
#include <cstddef>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <stdint.h>
#include <stdio.h>
#include <string>
 
#include "MHO_UUID.hh"
#include "picohash.h"
 
namespace hops
{
 
//forward declare our md5 hashing streamer (for plain old data types ((POD))
class MHO_MD5HashGenerator;
 
template< typename XValueType > class MHO_MD5HashGeneratorSingleType
{
    public:
        MHO_MD5HashGeneratorSingleType(){};
        virtual ~MHO_MD5HashGeneratorSingleType(){};
 
        friend inline MHO_MD5HashGenerator& operator<<(MHO_MD5HashGeneratorSingleType< XValueType >& s, const XValueType& obj)
        {
            //run the hash update
            _picohash_md5_update(s.GetMD5CTXPtr(), reinterpret_cast< const void* >(&obj), sizeof(XValueType));
            return s.Self();
        }
 
    protected:
        virtual _picohash_md5_ctx_t* GetMD5CTXPtr() = 0;
        virtual MHO_MD5HashGenerator& Self() = 0;
};
 
template<> class MHO_MD5HashGeneratorSingleType< std::string >
{
    public:
        MHO_MD5HashGeneratorSingleType(){};
        virtual ~MHO_MD5HashGeneratorSingleType(){};
 
        friend inline MHO_MD5HashGenerator& operator<<(MHO_MD5HashGeneratorSingleType< std::string >& s, std::string& obj)
        {
            char ch;
            for(unsigned int i = 0; i < obj.size(); i++)
            {
                ch = obj.at(i);
                _picohash_md5_update(s.GetMD5CTXPtr(), reinterpret_cast< const void* >(&ch), sizeof(char));
            }
            return s.Self();
        }
 
    protected:
        virtual _picohash_md5_ctx_t* GetMD5CTXPtr() = 0;
        virtual MHO_MD5HashGenerator& Self() = 0;
};
 
template< typename... XValueTypeS > class MHO_MD5HashGeneratorMultiType;
 
template< typename XValueType >
class MHO_MD5HashGeneratorMultiType< XValueType >: public MHO_MD5HashGeneratorSingleType< XValueType >
{};
 
template< typename XValueType, typename... XValueTypeS >
class MHO_MD5HashGeneratorMultiType< XValueType, XValueTypeS... >: public MHO_MD5HashGeneratorMultiType< XValueType >,
                                                                   public MHO_MD5HashGeneratorMultiType< XValueTypeS... >
{};
 
//construct the multi-type streamer for most basic POD types
typedef MHO_MD5HashGeneratorMultiType< bool, char, unsigned char, short, unsigned short, int, unsigned int, long, unsigned long,
                                       long long, unsigned long long, float, double, long double, std::string >
    MHO_MD5HashGeneratorBasicTypes;
 
class MHO_MD5HashGenerator: public MHO_MD5HashGeneratorBasicTypes
{
    public:
        MHO_MD5HashGenerator() { Initialize(); };
 
        virtual ~MHO_MD5HashGenerator(){};
 
        void Initialize()
        {
            _picohash_md5_init(&fHashStruct);
            for(unsigned int i = 0; i < PICOHASH_MD5_DIGEST_LENGTH; i++)
            {
                fDigest[i] = 0;
            }
        }
 
        void Finalize() { _picohash_md5_final(&fHashStruct, (void*)fDigest); }
 
        std::string GetDigest()
        {
            std::stringstream ss;
            for(unsigned int i = 0; i < PICOHASH_MD5_DIGEST_LENGTH; i++)
            {
                uint32_t tmp = fDigest[i];
                std::stringstream hss;
                hss << std::setw(2) << std::setfill('0') << std::hex << (int)(tmp);
                std::string hexstr = hss.str();
                ss << hexstr;
            }
            return ss.str();
        }
 
        MHO_UUID GetDigestAsUUID()
        {
            MHO_UUID uuid;
            for(unsigned int i = 0; i < PICOHASH_MD5_DIGEST_LENGTH; i++)
            {
                uuid[i] = fDigest[i];
            }
            return uuid;
        }
 
    protected:
        virtual _picohash_md5_ctx_t* GetMD5CTXPtr() override { return &fHashStruct; }
 
        MHO_MD5HashGenerator& Self() override { return *this; }
 
        _picohash_md5_ctx_t fHashStruct;
        uint8_t fDigest[PICOHASH_MD5_DIGEST_LENGTH];
};
 
} // namespace hops
 
#endif