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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
#if !defined( __STREAMUTIL_H__ )
#define __STREAMUTIL_H__
namespace StreamUtil
{
// Write data to stream and advance the totalBytes counter
//
inline
HRESULT WriteToStream( IStream * strm, void const * data, UINT32 sizeInBytes, UINT32 * totalBytes = NULL )
{
HRESULT hr = strm->Write( data, sizeInBytes, NULL );
if ( SUCCEEDED( hr ) && totalBytes != NULL )
*totalBytes += sizeInBytes;
return hr;
}
// Write a POD to stream
//
template < typename T >
HRESULT WritePODToStream( IStream * strm, T val, UINT32 * totalBytes )
{
return WriteToStream( strm, & val, sizeof( val ), totalBytes );
}
// Write concrete data types to stream
// Add additional overloads as needed
//
inline
HRESULT WriteToStream( IStream * strm, int val, UINT32 * totalBytes = NULL )
{
return WritePODToStream( strm, val, totalBytes );
}
inline
HRESULT WriteToStream( IStream * strm, DWORD val, UINT32 * totalBytes = NULL )
{
return WritePODToStream( strm, val, totalBytes );
}
inline
HRESULT WriteToStream( IStream * strm, WORD val, UINT32 * totalBytes = NULL )
{
return WritePODToStream( strm, val, totalBytes );
}
inline
HRESULT WriteToStream( IStream * strm, BYTE val, UINT32 * totalBytes = NULL )
{
return WritePODToStream( strm, val, totalBytes );
}
// Align to DWORD boundary
//
inline
HRESULT AlignDWORD( IStream * strm, UINT32 * totalBytes )
{
HRESULT hr = S_OK;
UINT32 aligned = *totalBytes + 3 & ~3;
if (aligned > *totalBytes)
{ // The *totalBytes were not aligned to DWORD, we need to add padding
DWORD data = 0;
hr = WriteToStream( strm, & data, aligned - *totalBytes, totalBytes );
}
else if (aligned < *totalBytes)
{ // We got an integer overflow in 'aligned' expression above
hr = COR_E_OVERFLOW;
}
return hr;
}
// Get stream position
//
inline
HRESULT GetPos( IStream * strm, UINT32 * pos )
{
LARGE_INTEGER temp = { {0} };
ULARGE_INTEGER ul_pos = { {0} };
HRESULT hr = strm->Seek( temp, STREAM_SEEK_CUR, & ul_pos );
* pos = ul_pos.u.LowPart;
return hr;
}
class NullStream : public IStream
{
public:
NullStream()
: m_pos( 0 )
{}
ULONG STDMETHODCALLTYPE AddRef()
{
_ASSERTE( false );
return 0;
}
ULONG STDMETHODCALLTYPE Release()
{
SUPPORTS_DAC_HOST_ONLY;
_ASSERTE( false );
return 0;
}
HRESULT STDMETHODCALLTYPE QueryInterface( REFIID, PVOID* )
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE Read(void *pv, ULONG cb, ULONG *pcbRead)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE Write(const void *pv, ULONG cb, ULONG *pcbWritten)
{
m_pos += cb;
if (pcbWritten != NULL)
{
*pcbWritten = cb;
}
return S_OK;
}
HRESULT STDMETHODCALLTYPE Seek(LARGE_INTEGER dlibMove,DWORD dwOrigin, ULARGE_INTEGER *plibNewPosition)
{
if ( dwOrigin != STREAM_SEEK_CUR || dlibMove.QuadPart != 0 || plibNewPosition == NULL )
return E_NOTIMPL;
plibNewPosition->u.HighPart = 0;
plibNewPosition->u.LowPart = m_pos;
return S_OK;
}
HRESULT STDMETHODCALLTYPE SetSize(ULARGE_INTEGER libNewSize)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE CopyTo(
IStream *pstm,
ULARGE_INTEGER cb,
ULARGE_INTEGER *pcbRead,
ULARGE_INTEGER *pcbWritten)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE Commit(
DWORD grfCommitFlags)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE Revert()
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE LockRegion(
ULARGE_INTEGER libOffset,
ULARGE_INTEGER cb,
DWORD dwLockType)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE UnlockRegion(
ULARGE_INTEGER libOffset,
ULARGE_INTEGER cb,
DWORD dwLockType)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE Stat(
STATSTG *pstatstg,
DWORD grfStatFlag)
{
_ASSERTE( false );
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE Clone(
IStream **ppstm)
{
_ASSERTE( false );
return E_NOTIMPL;
}
private:
UINT32 m_pos;
}; // class NullStream
}; // namespace StreamUtil
#endif
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