channels.h

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// channels.h - written and placed in the public domain by Wei Dai


#ifndef CRYPTOPP_CHANNELS_H
#define CRYPTOPP_CHANNELS_H

#include "cryptlib.h"
#include "simple.h"
#include "smartptr.h"
#include "stdcpp.h"

NAMESPACE_BEGIN(CryptoPP)

#if 0
class MessageSwitch : public Sink
{
public:
        void AddDefaultRoute(BufferedTransformation &destination, const std::string &channel);
        void AddRoute(unsigned int begin, unsigned int end, BufferedTransformation &destination, const std::string &channel);

        void Put(byte inByte);
        void Put(const byte *inString, unsigned int length);

        void Flush(bool completeFlush, int propagation=-1);
        void MessageEnd(int propagation=-1);
        void PutMessageEnd(const byte *inString, unsigned int length, int propagation=-1);
        void MessageSeriesEnd(int propagation=-1);

private:
        typedef std::pair<BufferedTransformation *, std::string> Route;
        struct RangeRoute
        {
                RangeRoute(unsigned int begin, unsigned int end, const Route &route)
                        : begin(begin), end(end), route(route) {}
                bool operator<(const RangeRoute &rhs) const {return begin < rhs.begin;}
                unsigned int begin, end;
                Route route;
        };

        typedef std::list<RangeRoute> RouteList;
        typedef std::list<Route> DefaultRouteList;

        RouteList m_routes;
        DefaultRouteList m_defaultRoutes;
        unsigned int m_nCurrentMessage;
};
#endif

class ChannelSwitchTypedefs
{
public:
        typedef std::pair<BufferedTransformation *, std::string> Route;
        typedef std::multimap<std::string, Route> RouteMap;

        typedef std::pair<BufferedTransformation *, value_ptr<std::string> > DefaultRoute;
        typedef std::list<DefaultRoute> DefaultRouteList;

        // SunCC workaround: can't use const_iterator here
        typedef RouteMap::iterator MapIterator;
        typedef DefaultRouteList::iterator ListIterator;
};

class ChannelSwitch;

class ChannelRouteIterator : public ChannelSwitchTypedefs
{
public:
        ChannelRouteIterator(ChannelSwitch &cs) : m_cs(cs), m_useDefault(false) {}

        void Reset(const std::string &channel);
        bool End() const;
        void Next();
        BufferedTransformation & Destination();
        const std::string & Channel();

        ChannelSwitch& m_cs;
        std::string m_channel;
        bool m_useDefault;
        MapIterator m_itMapCurrent, m_itMapEnd;
        ListIterator m_itListCurrent, m_itListEnd;

protected:
        // Hide this to see if we break something...
        ChannelRouteIterator();
};

class CRYPTOPP_DLL ChannelSwitch : public Multichannel<Sink>, public ChannelSwitchTypedefs
{
public:
        ChannelSwitch() : m_it(*this), m_blocked(false) {}
        ChannelSwitch(BufferedTransformation &destination) : m_it(*this), m_blocked(false)
        {
                AddDefaultRoute(destination);
        }
        ChannelSwitch(BufferedTransformation &destination, const std::string &outChannel) : m_it(*this), m_blocked(false)
        {
                AddDefaultRoute(destination, outChannel);
        }

        void IsolatedInitialize(const NameValuePairs &parameters=g_nullNameValuePairs);

        size_t ChannelPut2(const std::string &channel, const byte *begin, size_t length, int messageEnd, bool blocking);
        size_t ChannelPutModifiable2(const std::string &channel, byte *begin, size_t length, int messageEnd, bool blocking);

        bool ChannelFlush(const std::string &channel, bool completeFlush, int propagation=-1, bool blocking=true);
        bool ChannelMessageSeriesEnd(const std::string &channel, int propagation=-1, bool blocking=true);

        byte * ChannelCreatePutSpace(const std::string &channel, size_t &size);

        void AddDefaultRoute(BufferedTransformation &destination);
        void RemoveDefaultRoute(BufferedTransformation &destination);
        void AddDefaultRoute(BufferedTransformation &destination, const std::string &outChannel);
        void RemoveDefaultRoute(BufferedTransformation &destination, const std::string &outChannel);
        void AddRoute(const std::string &inChannel, BufferedTransformation &destination, const std::string &outChannel);
        void RemoveRoute(const std::string &inChannel, BufferedTransformation &destination, const std::string &outChannel);

private:
        RouteMap m_routeMap;
        DefaultRouteList m_defaultRoutes;

        ChannelRouteIterator m_it;
        bool m_blocked;

        friend class ChannelRouteIterator;
};

NAMESPACE_END

#endif