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// StreamBinder.cpp
#include "StdAfx.h"
#include "StreamBinder.h"
#include "../../Common/Defs.h"
#include "../../Common/MyCom.h"
using namespace NWindows;
using namespace NSynchronization;
class CSequentialInStreamForBinder:
public ISequentialInStream,
public CMyUnknownImp
{
public:
MY_UNKNOWN_IMP
STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize);
private:
CStreamBinder *m_StreamBinder;
public:
~CSequentialInStreamForBinder() { m_StreamBinder->CloseRead(); }
void SetBinder(CStreamBinder *streamBinder) { m_StreamBinder = streamBinder; }
};
STDMETHODIMP CSequentialInStreamForBinder::Read(void *data, UInt32 size, UInt32 *processedSize)
{ return m_StreamBinder->Read(data, size, processedSize); }
class CSequentialOutStreamForBinder:
public ISequentialOutStream,
public CMyUnknownImp
{
public:
MY_UNKNOWN_IMP
STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize);
private:
CStreamBinder *m_StreamBinder;
public:
~CSequentialOutStreamForBinder() { m_StreamBinder->CloseWrite(); }
void SetBinder(CStreamBinder *streamBinder) { m_StreamBinder = streamBinder; }
};
STDMETHODIMP CSequentialOutStreamForBinder::Write(const void *data, UInt32 size, UInt32 *processedSize)
{ return m_StreamBinder->Write(data, size, processedSize); }
//////////////////////////
// CStreamBinder
// (_thereAreBytesToReadEvent && _bufferSize == 0) means that stream is finished.
void CStreamBinder::CreateEvents()
{
_allBytesAreWritenEvent = new CManualResetEvent(true);
_thereAreBytesToReadEvent = new CManualResetEvent(false);
_readStreamIsClosedEvent = new CManualResetEvent(false);
}
void CStreamBinder::ReInit()
{
_thereAreBytesToReadEvent->Reset();
_readStreamIsClosedEvent->Reset();
ProcessedSize = 0;
}
CStreamBinder::~CStreamBinder()
{
if (_allBytesAreWritenEvent != NULL)
delete _allBytesAreWritenEvent;
if (_thereAreBytesToReadEvent != NULL)
delete _thereAreBytesToReadEvent;
if (_readStreamIsClosedEvent != NULL)
delete _readStreamIsClosedEvent;
}
void CStreamBinder::CreateStreams(ISequentialInStream **inStream,
ISequentialOutStream **outStream)
{
CSequentialInStreamForBinder *inStreamSpec = new
CSequentialInStreamForBinder;
CMyComPtr<ISequentialInStream> inStreamLoc(inStreamSpec);
inStreamSpec->SetBinder(this);
*inStream = inStreamLoc.Detach();
CSequentialOutStreamForBinder *outStreamSpec = new
CSequentialOutStreamForBinder;
CMyComPtr<ISequentialOutStream> outStreamLoc(outStreamSpec);
outStreamSpec->SetBinder(this);
*outStream = outStreamLoc.Detach();
_buffer = NULL;
_bufferSize= 0;
ProcessedSize = 0;
}
HRESULT CStreamBinder::Read(void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 sizeToRead = size;
if (size > 0)
{
if(!_thereAreBytesToReadEvent->Lock())
return E_FAIL;
sizeToRead = MyMin(_bufferSize, size);
if (_bufferSize > 0)
{
MoveMemory(data, _buffer, sizeToRead);
_buffer = ((const Byte *)_buffer) + sizeToRead;
_bufferSize -= sizeToRead;
if (_bufferSize == 0)
{
_thereAreBytesToReadEvent->Reset();
_allBytesAreWritenEvent->Set();
}
}
}
if (processedSize != NULL)
*processedSize = sizeToRead;
ProcessedSize += sizeToRead;
return S_OK;
}
void CStreamBinder::CloseRead()
{
_readStreamIsClosedEvent->Set();
}
HRESULT CStreamBinder::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (size > 0)
{
_buffer = data;
_bufferSize = size;
_allBytesAreWritenEvent->Reset();
_thereAreBytesToReadEvent->Set();
HANDLE events[2];
events[0] = *_allBytesAreWritenEvent;
events[1] = *_readStreamIsClosedEvent;
DWORD waitResult = ::WaitForMultipleObjects(2, events, FALSE, INFINITE);
if (waitResult != WAIT_OBJECT_0 + 0)
{
// ReadingWasClosed = true;
return E_FAIL;
}
// if(!_allBytesAreWritenEvent.Lock())
// return E_FAIL;
}
if (processedSize != NULL)
*processedSize = size;
return S_OK;
}
void CStreamBinder::CloseWrite()
{
// _bufferSize must be = 0
_thereAreBytesToReadEvent->Set();
}
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