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// OutMemStream.cpp
#include "StdAfx.h"
#include "OutMemStream.h"
void COutMemStream::Free()
{
Blocks.Free(_memManager);
Blocks.LockMode = true;
}
void COutMemStream::Init()
{
WriteToRealStreamEvent.Reset();
_unlockEventWasSent = false;
_realStreamMode = false;
Free();
_curBlockPos = 0;
_curBlockIndex = 0;
}
void COutMemStream::DetachData(CMemLockBlocks &blocks)
{
Blocks.Detach(blocks, _memManager);
Free();
}
HRESULT COutMemStream::WriteToRealStream()
{
RINOK(Blocks.WriteToStream(_memManager->GetBlockSize(), OutSeqStream));
Blocks.Free(_memManager);
return S_OK;
}
STDMETHODIMP COutMemStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (_realStreamMode)
return OutSeqStream->Write(data, size, processedSize);
if (processedSize != 0)
*processedSize = 0;
while(size != 0)
{
if ((int)_curBlockIndex < Blocks.Blocks.Size())
{
Byte *p = (Byte *)Blocks.Blocks[(int)_curBlockIndex] + _curBlockPos;
size_t curSize = _memManager->GetBlockSize() - _curBlockPos;
if (size < curSize)
curSize = size;
memmove(p, data, curSize);
if (processedSize != 0)
*processedSize += (UInt32)curSize;
data = (const void *)((const Byte *)data + curSize);
size -= (UInt32)curSize;
_curBlockPos += curSize;
UInt64 pos64 = GetPos();
if (pos64 > Blocks.TotalSize)
Blocks.TotalSize = pos64;
if (_curBlockPos == _memManager->GetBlockSize())
{
_curBlockIndex++;
_curBlockPos = 0;
}
continue;
}
HANDLE events[3] = { StopWritingEvent, WriteToRealStreamEvent, /* NoLockEvent, */ _memManager->Semaphore };
DWORD waitResult = ::WaitForMultipleObjects((Blocks.LockMode ? 3 : 2), events, FALSE, INFINITE);
switch (waitResult)
{
case (WAIT_OBJECT_0 + 0):
return StopWriteResult;
case (WAIT_OBJECT_0 + 1):
{
_realStreamMode = true;
RINOK(WriteToRealStream());
UInt32 processedSize2;
HRESULT res = OutSeqStream->Write(data, size, &processedSize2);
if (processedSize != 0)
*processedSize += processedSize2;
return res;
}
/*
case (WAIT_OBJECT_0 + 2):
{
// it has bug: no write.
if (!Blocks.SwitchToNoLockMode(_memManager))
return E_FAIL;
break;
}
*/
case (WAIT_OBJECT_0 + 2):
break;
default:
return E_FAIL;
}
Blocks.Blocks.Add(_memManager->AllocateBlock());
if (Blocks.Blocks.Back() == 0)
return E_FAIL;
}
return S_OK;
}
STDMETHODIMP COutMemStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
if (_realStreamMode)
{
if (!OutStream)
return E_FAIL;
return OutStream->Seek(offset, seekOrigin, newPosition);
}
if (seekOrigin == STREAM_SEEK_CUR)
{
if (offset != 0)
return E_NOTIMPL;
}
else if (seekOrigin == STREAM_SEEK_SET)
{
if (offset != 0)
return E_NOTIMPL;
_curBlockIndex = 0;
_curBlockPos = 0;
}
else
return E_NOTIMPL;
if (newPosition != 0)
*newPosition = GetPos();
return S_OK;
}
STDMETHODIMP COutMemStream::SetSize(UInt64 newSize)
{
if (_realStreamMode)
{
if (!OutStream)
return E_FAIL;
return OutStream->SetSize(newSize);
}
Blocks.TotalSize = newSize;
return S_OK;
}
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