mqueue.cpp
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// mqueue.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#ifndef CRYPTOPP_IMPORTS
#include "mqueue.h"
NAMESPACE_BEGIN(CryptoPP)
MessageQueue::MessageQueue(unsigned int nodeSize)
: m_queue(nodeSize), m_lengths(1, 0U), m_messageCounts(1, 0U)
{
}
size_t MessageQueue::CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end, const std::string &channel, bool blocking) const
{
if (begin >= MaxRetrievable())
return 0;
return m_queue.CopyRangeTo2(target, begin, STDMIN(MaxRetrievable(), end), channel, blocking);
}
size_t MessageQueue::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
{
transferBytes = STDMIN(MaxRetrievable(), transferBytes);
size_t blockedBytes = m_queue.TransferTo2(target, transferBytes, channel, blocking);
m_lengths.front() -= transferBytes;
return blockedBytes;
}
bool MessageQueue::GetNextMessage()
{
if (NumberOfMessages() > 0 && !AnyRetrievable())
{
m_lengths.pop_front();
if (m_messageCounts[0] == 0 && m_messageCounts.size() > 1)
m_messageCounts.pop_front();
return true;
}
else
return false;
}
unsigned int MessageQueue::CopyMessagesTo(BufferedTransformation &target, unsigned int count, const std::string &channel) const
{
ByteQueue::Walker walker(m_queue);
std::deque<lword>::const_iterator it = m_lengths.begin();
unsigned int i;
for (i=0; i<count && it != --m_lengths.end(); ++i, ++it)
{
walker.TransferTo(target, *it, channel);
if (GetAutoSignalPropagation())
target.ChannelMessageEnd(channel, GetAutoSignalPropagation()-1);
}
return i;
}
void MessageQueue::swap(MessageQueue &rhs)
{
m_queue.swap(rhs.m_queue);
m_lengths.swap(rhs.m_lengths);
}
const byte * MessageQueue::Spy(size_t &contiguousSize) const
{
const byte *result = m_queue.Spy(contiguousSize);
contiguousSize = UnsignedMin(contiguousSize, MaxRetrievable());
return result;
}
// *************************************************************
unsigned int EqualityComparisonFilter::MapChannel(const std::string &channel) const
{
if (channel == m_firstChannel)
return 0;
else if (channel == m_secondChannel)
return 1;
else
return 2;
}
size_t EqualityComparisonFilter::ChannelPut2(const std::string &channel, const byte *inString, size_t length, int messageEnd, bool blocking)
{
if (!blocking)
throw BlockingInputOnly("EqualityComparisonFilter");
unsigned int i = MapChannel(channel);
if (i == 2)
return Output(3, inString, length, messageEnd, blocking, channel);
else if (m_mismatchDetected)
return 0;
else
{
MessageQueue &q1 = m_q[i], &q2 = m_q[1-i];
if (q2.AnyMessages() && q2.MaxRetrievable() < length)
goto mismatch;
while (length > 0 && q2.AnyRetrievable())
{
size_t len = length;
const byte *data = q2.Spy(len);
len = STDMIN(len, length);
if (memcmp(inString, data, len) != 0)
goto mismatch;
inString += len;
length -= len;
q2.Skip(len);
}
q1.Put(inString, length);
if (messageEnd)
{
if (q2.AnyRetrievable())
goto mismatch;
else if (q2.AnyMessages())
q2.GetNextMessage();
else if (q2.NumberOfMessageSeries() > 0)
goto mismatch;
else
q1.MessageEnd();
}
return 0;
mismatch:
return HandleMismatchDetected(blocking);
}
}
bool EqualityComparisonFilter::ChannelMessageSeriesEnd(const std::string &channel, int propagation, bool blocking)
{
unsigned int i = MapChannel(channel);
if (i == 2)
{
OutputMessageSeriesEnd(4, propagation, blocking, channel);
return false;
}
else if (m_mismatchDetected)
return false;
else
{
MessageQueue &q1 = m_q[i], &q2 = m_q[1-i];
if (q2.AnyRetrievable() || q2.AnyMessages())
goto mismatch;
else if (q2.NumberOfMessageSeries() > 0)
return Output(2, (const byte *)"\1", 1, 0, blocking) != 0;
else
q1.MessageSeriesEnd();
return false;
mismatch:
return HandleMismatchDetected(blocking);
}
}
bool EqualityComparisonFilter::HandleMismatchDetected(bool blocking)
{
m_mismatchDetected = true;
if (m_throwIfNotEqual)
throw MismatchDetected();
return Output(1, (const byte *)"\0", 1, 0, blocking) != 0;
}
NAMESPACE_END
#endif