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// MultiStream.cpp
#include "StdAfx.h"
#include "MultiStream.h"
STDMETHODIMP CMultiStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (size == 0)
return S_OK;
if (_pos >= _totalLength)
return S_OK;
{
unsigned left = 0, mid = _streamIndex, right = Streams.Size();
for (;;)
{
CSubStreamInfo &m = Streams[mid];
if (_pos < m.GlobalOffset)
right = mid;
else if (_pos >= m.GlobalOffset + m.Size)
left = mid + 1;
else
{
_streamIndex = mid;
break;
}
mid = (left + right) / 2;
}
_streamIndex = mid;
}
CSubStreamInfo &s = Streams[_streamIndex];
UInt64 localPos = _pos - s.GlobalOffset;
if (localPos != s.LocalPos)
{
RINOK(s.Stream->Seek(localPos, STREAM_SEEK_SET, &s.LocalPos));
}
UInt64 rem = s.Size - localPos;
if (size > rem)
size = (UInt32)rem;
HRESULT result = s.Stream->Read(data, size, &size);
_pos += size;
s.LocalPos += size;
if (processedSize)
*processedSize = size;
return result;
}
STDMETHODIMP CMultiStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _pos; break;
case STREAM_SEEK_END: offset += _totalLength; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_pos = offset;
if (newPosition)
*newPosition = offset;
return S_OK;
}
/*
class COutVolumeStream:
public ISequentialOutStream,
public CMyUnknownImp
{
unsigned _volIndex;
UInt64 _volSize;
UInt64 _curPos;
CMyComPtr<ISequentialOutStream> _volumeStream;
COutArchive _archive;
CCRC _crc;
public:
MY_UNKNOWN_IMP
CFileItem _file;
CUpdateOptions _options;
CMyComPtr<IArchiveUpdateCallback2> VolumeCallback;
void Init(IArchiveUpdateCallback2 *volumeCallback,
const UString &name)
{
_file.Name = name;
_file.IsStartPosDefined = true;
_file.StartPos = 0;
VolumeCallback = volumeCallback;
_volIndex = 0;
_volSize = 0;
}
HRESULT Flush();
STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize);
};
HRESULT COutVolumeStream::Flush()
{
if (_volumeStream)
{
_file.UnPackSize = _curPos;
_file.FileCRC = _crc.GetDigest();
RINOK(WriteVolumeHeader(_archive, _file, _options));
_archive.Close();
_volumeStream.Release();
_file.StartPos += _file.UnPackSize;
}
return S_OK;
}
*/
/*
STDMETHODIMP COutMultiStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
while (size > 0)
{
if (_streamIndex >= Streams.Size())
{
CSubStreamInfo subStream;
RINOK(VolumeCallback->GetVolumeSize(Streams.Size(), &subStream.Size));
RINOK(VolumeCallback->GetVolumeStream(Streams.Size(), &subStream.Stream));
subStream.Pos = 0;
Streams.Add(subStream);
continue;
}
CSubStreamInfo &subStream = Streams[_streamIndex];
if (_offsetPos >= subStream.Size)
{
_offsetPos -= subStream.Size;
_streamIndex++;
continue;
}
if (_offsetPos != subStream.Pos)
{
CMyComPtr<IOutStream> outStream;
RINOK(subStream.Stream.QueryInterface(IID_IOutStream, &outStream));
RINOK(outStream->Seek(_offsetPos, STREAM_SEEK_SET, NULL));
subStream.Pos = _offsetPos;
}
UInt32 curSize = (UInt32)MyMin((UInt64)size, subStream.Size - subStream.Pos);
UInt32 realProcessed;
RINOK(subStream.Stream->Write(data, curSize, &realProcessed));
data = (void *)((Byte *)data + realProcessed);
size -= realProcessed;
subStream.Pos += realProcessed;
_offsetPos += realProcessed;
_absPos += realProcessed;
if (_absPos > _length)
_length = _absPos;
if (processedSize)
*processedSize += realProcessed;
if (subStream.Pos == subStream.Size)
{
_streamIndex++;
_offsetPos = 0;
}
if (realProcessed != curSize && realProcessed == 0)
return E_FAIL;
}
return S_OK;
}
STDMETHODIMP COutMultiStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _absPos; break;
case STREAM_SEEK_END: offset += _length; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_absPos = offset;
_offsetPos = _absPos;
_streamIndex = 0;
if (newPosition)
*newPosition = offset;
return S_OK;
}
*/
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