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// --------------------------------------------------------------------------
//
// File
// Name: ReadLoggingStream.cpp
// Purpose: Buffering wrapper around IOStreams
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <string.h>
#include "ReadLoggingStream.h"
#include "CommonException.h"
#include "Logging.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::ReadLoggingStream(const char *, int, int)
// Purpose: Constructor, set up buffer
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
ReadLoggingStream::ReadLoggingStream(IOStream& rSource, Logger& rLogger)
: mrSource(rSource),
mOffset(0),
mLength(mrSource.BytesLeftToRead()),
mTotalRead(0),
mStartTime(GetCurrentBoxTime()),
mrLogger(rLogger)
{ }
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::Read(void *, int)
// Purpose: Reads bytes from the file
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
int ReadLoggingStream::Read(void *pBuffer, int NBytes, int Timeout)
{
int numBytesRead = mrSource.Read(pBuffer, NBytes, Timeout);
if (numBytesRead > 0)
{
mTotalRead += numBytesRead;
mOffset += numBytesRead;
}
if (mLength == 0)
{
mrLogger.Log(numBytesRead, mOffset);
}
else if (mTotalRead == 0)
{
mrLogger.Log(numBytesRead, mOffset, mLength);
}
else
{
box_time_t timeNow = GetCurrentBoxTime();
box_time_t elapsed = timeNow - mStartTime;
box_time_t finish = (elapsed * mLength) / mTotalRead;
// box_time_t remain = finish - elapsed;
mrLogger.Log(numBytesRead, mOffset, mLength, elapsed, finish);
}
return numBytesRead;
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::BytesLeftToRead()
// Purpose: Returns number of bytes to read (may not be most efficient function ever)
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
IOStream::pos_type ReadLoggingStream::BytesLeftToRead()
{
return mLength - mOffset;
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::Write(void *, int)
// Purpose: Writes bytes to the underlying stream (not supported)
// Created: 2003/07/31
//
// --------------------------------------------------------------------------
void ReadLoggingStream::Write(const void *pBuffer, int NBytes, int Timeout)
{
THROW_EXCEPTION(CommonException, NotSupported);
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::GetPosition()
// Purpose: Get position in stream
// Created: 2003/08/21
//
// --------------------------------------------------------------------------
IOStream::pos_type ReadLoggingStream::GetPosition() const
{
return mOffset;
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::Seek(pos_type, int)
// Purpose: Seeks within file, as lseek, invalidate buffer
// Created: 2003/07/31
//
// --------------------------------------------------------------------------
void ReadLoggingStream::Seek(IOStream::pos_type Offset, int SeekType)
{
mrSource.Seek(Offset, SeekType);
switch (SeekType)
{
case SeekType_Absolute:
{
// just go there
mOffset = Offset;
}
break;
case SeekType_Relative:
{
// Actual underlying file position is
// (mBufferSize - mBufferPosition) ahead of us.
// Need to subtract that amount from the seek
// to seek forward that much less, putting the
// real pointer in the right place.
mOffset += Offset;
}
break;
case SeekType_End:
{
// Actual underlying file position is
// (mBufferSize - mBufferPosition) ahead of us.
// Need to add that amount to the seek
// to seek backwards that much more, putting the
// real pointer in the right place.
mOffset = mLength - Offset;
}
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::Close()
// Purpose: Closes the underlying stream (not needed)
// Created: 2003/07/31
//
// --------------------------------------------------------------------------
void ReadLoggingStream::Close()
{
THROW_EXCEPTION(CommonException, NotSupported);
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::StreamDataLeft()
// Purpose: Any data left to write?
// Created: 2003/08/02
//
// --------------------------------------------------------------------------
bool ReadLoggingStream::StreamDataLeft()
{
return mrSource.StreamDataLeft();
}
// --------------------------------------------------------------------------
//
// Function
// Name: ReadLoggingStream::StreamClosed()
// Purpose: Is the stream closed?
// Created: 2003/08/02
//
// --------------------------------------------------------------------------
bool ReadLoggingStream::StreamClosed()
{
return mrSource.StreamClosed();
}
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