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mqueue.h

00001 #ifndef CRYPTOPP_MQUEUE_H
00002 #define CRYPTOPP_MQUEUE_H
00003 
00004 #include "queue.h"
00005 #include "filters.h"
00006 #include <deque>
00007 
00008 NAMESPACE_BEGIN(CryptoPP)
00009 
00010 //! Message Queue
00011 class CRYPTOPP_DLL MessageQueue : public AutoSignaling<BufferedTransformation>
00012 {
00013 public:
00014     MessageQueue(unsigned int nodeSize=256);
00015 
00016     void IsolatedInitialize(const NameValuePairs &parameters)
00017         {m_queue.IsolatedInitialize(parameters); m_lengths.assign(1, 0U); m_messageCounts.assign(1, 0U);}
00018     size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
00019     {
00020         m_queue.Put(begin, length);
00021         m_lengths.back() += length;
00022         if (messageEnd)
00023         {
00024             m_lengths.push_back(0);
00025             m_messageCounts.back()++;
00026         }
00027         return 0;
00028     }
00029     bool IsolatedFlush(bool hardFlush, bool blocking) {return false;}
00030     bool IsolatedMessageSeriesEnd(bool blocking)
00031         {m_messageCounts.push_back(0); return false;}
00032 
00033     lword MaxRetrievable() const
00034         {return m_lengths.front();}
00035     bool AnyRetrievable() const
00036         {return m_lengths.front() > 0;}
00037 
00038     size_t TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true);
00039     size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const;
00040 
00041     lword TotalBytesRetrievable() const
00042         {return m_queue.MaxRetrievable();}
00043     unsigned int NumberOfMessages() const
00044         {return (unsigned int)m_lengths.size()-1;}
00045     bool GetNextMessage();
00046 
00047     unsigned int NumberOfMessagesInThisSeries() const
00048         {return m_messageCounts[0];}
00049     unsigned int NumberOfMessageSeries() const
00050         {return (unsigned int)m_messageCounts.size()-1;}
00051 
00052     unsigned int CopyMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) const;
00053 
00054     const byte * Spy(size_t &contiguousSize) const;
00055 
00056     void swap(MessageQueue &rhs);
00057 
00058 private:
00059     ByteQueue m_queue;
00060     std::deque<lword> m_lengths;
00061     std::deque<unsigned int> m_messageCounts;
00062 };
00063 
00064 
00065 //! A filter that checks messages on two channels for equality
00066 class CRYPTOPP_DLL EqualityComparisonFilter : public Unflushable<Multichannel<Filter> >
00067 {
00068 public:
00069     struct MismatchDetected : public Exception {MismatchDetected() : Exception(DATA_INTEGRITY_CHECK_FAILED, "EqualityComparisonFilter: did not receive the same data on two channels") {}};
00070 
00071     /*! if throwIfNotEqual is false, this filter will output a '\\0' byte when it detects a mismatch, '\\1' otherwise */
00072     EqualityComparisonFilter(BufferedTransformation *attachment=NULL, bool throwIfNotEqual=true, const std::string &firstChannel="0", const std::string &secondChannel="1")
00073         : m_throwIfNotEqual(throwIfNotEqual), m_mismatchDetected(false)
00074         , m_firstChannel(firstChannel), m_secondChannel(secondChannel)
00075         {Detach(attachment);}
00076 
00077     size_t ChannelPut2(const std::string &channel, const byte *begin, size_t length, int messageEnd, bool blocking);
00078     bool ChannelMessageSeriesEnd(const std::string &channel, int propagation=-1, bool blocking=true);
00079 
00080 private:
00081     unsigned int MapChannel(const std::string &channel) const;
00082     bool HandleMismatchDetected(bool blocking);
00083 
00084     bool m_throwIfNotEqual, m_mismatchDetected;
00085     std::string m_firstChannel, m_secondChannel;
00086     MessageQueue m_q[2];
00087 };
00088 
00089 NAMESPACE_END
00090 
00091 #ifndef __BORLANDC__
00092 NAMESPACE_BEGIN(std)
00093 template<> inline void swap(CryptoPP::MessageQueue &a, CryptoPP::MessageQueue &b)
00094 {
00095     a.swap(b);
00096 }
00097 NAMESPACE_END
00098 #endif
00099 
00100 #endif

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