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// RarVolumeInStream.cpp
#include "StdAfx.h"
#include "../../../../C/7zCrc.h"
#include "RarVolumeInStream.h"
namespace NArchive {
namespace NRar {
void CFolderInStream::Init(
CObjectVector<CInArchive> *archives,
const CObjectVector<CItemEx> *items,
const CRefItem &refItem)
{
_archives = archives;
_items = items;
_refItem = refItem;
_curIndex = 0;
CRCs.Clear();
_fileIsOpen = false;
}
HRESULT CFolderInStream::OpenStream()
{
while (_curIndex < _refItem.NumItems)
{
const CItemEx &item = (*_items)[_refItem.ItemIndex + _curIndex];
_stream.Attach((*_archives)[_refItem.VolumeIndex + _curIndex].
CreateLimitedStream(item.GetDataPosition(), item.PackSize));
_curIndex++;
_fileIsOpen = true;
_crc = CRC_INIT_VAL;
return S_OK;
}
return S_OK;
}
HRESULT CFolderInStream::CloseStream()
{
CRCs.Add(CRC_GET_DIGEST(_crc));
_stream.Release();
_fileIsOpen = false;
return S_OK;
}
STDMETHODIMP CFolderInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 realProcessedSize = 0;
while ((_curIndex < _refItem.NumItems || _fileIsOpen) && size > 0)
{
if (_fileIsOpen)
{
UInt32 localProcessedSize;
RINOK(_stream->Read(
((Byte *)data) + realProcessedSize, size, &localProcessedSize));
_crc = CrcUpdate(_crc, ((Byte *)data) + realProcessedSize, localProcessedSize);
if (localProcessedSize == 0)
{
RINOK(CloseStream());
continue;
}
realProcessedSize += localProcessedSize;
size -= localProcessedSize;
break;
}
else
{
RINOK(OpenStream());
}
}
if (processedSize != 0)
*processedSize = realProcessedSize;
return S_OK;
}
}}
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