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Sweden-Number/dlls/ole32/hglobalstream.c

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/*
* HGLOBAL Stream implementation
*
* This file contains the implementation of the stream interface
* for streams contained supported by an HGLOBAL pointer.
*
* Copyright 1999 Francis Beaudet
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <assert.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#define COBJMACROS
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "objbase.h"
#include "ole2.h"
#include "winerror.h"
#include "winternl.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(storage);
/****************************************************************************
* HGLOBALStreamImpl definition.
*
* This class implements the IStream interface and represents a stream
* supported by an HGLOBAL pointer.
*/
typedef struct
{
IStream IStream_iface;
LONG ref;
/* support for the stream */
HGLOBAL supportHandle;
/* if TRUE the HGLOBAL is destroyed when the stream is finally released */
BOOL deleteOnRelease;
/* size of the stream */
ULARGE_INTEGER streamSize;
/* current position of the cursor */
ULARGE_INTEGER currentPosition;
} HGLOBALStreamImpl;
static inline HGLOBALStreamImpl *impl_from_IStream(IStream *iface)
{
return CONTAINING_RECORD(iface, HGLOBALStreamImpl, IStream_iface);
}
static HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
IStream* iface,
REFIID riid, /* [in] */
void** ppvObject) /* [iid_is][out] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
if (ppvObject==0)
return E_INVALIDARG;
*ppvObject = 0;
if (IsEqualIID(&IID_IUnknown, riid) ||
IsEqualIID(&IID_ISequentialStream, riid) ||
IsEqualIID(&IID_IStream, riid))
{
*ppvObject = This;
}
if ((*ppvObject)==0)
return E_NOINTERFACE;
IStream_AddRef(iface);
return S_OK;
}
static ULONG WINAPI HGLOBALStreamImpl_AddRef(IStream* iface)
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
return InterlockedIncrement(&This->ref);
}
static ULONG WINAPI HGLOBALStreamImpl_Release(
IStream* iface)
{
HGLOBALStreamImpl* This= impl_from_IStream(iface);
ULONG ref = InterlockedDecrement(&This->ref);
if (!ref)
{
if (This->deleteOnRelease)
{
GlobalFree(This->supportHandle);
This->supportHandle = NULL;
}
HeapFree(GetProcessHeap(), 0, This);
}
return ref;
}
/***
* This method is part of the ISequentialStream interface.
*
* If reads a block of information from the stream at the current
* position. It then moves the current position at the end of the
* read block
*
* See the documentation of ISequentialStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_Read(
IStream* iface,
void* pv, /* [length_is][size_is][out] */
ULONG cb, /* [in] */
ULONG* pcbRead) /* [out] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
void* supportBuffer;
ULONG bytesReadBuffer;
ULONG bytesToReadFromBuffer;
TRACE("(%p, %p, %d, %p)\n", iface,
pv, cb, pcbRead);
/*
* If the caller is not interested in the number of bytes read,
* we use another buffer to avoid "if" statements in the code.
*/
if (pcbRead==0)
pcbRead = &bytesReadBuffer;
/*
* Using the known size of the stream, calculate the number of bytes
* to read from the block chain
*/
bytesToReadFromBuffer = min( This->streamSize.u.LowPart - This->currentPosition.u.LowPart, cb);
/*
* Lock the buffer in position and copy the data.
*/
supportBuffer = GlobalLock(This->supportHandle);
if (!supportBuffer)
{
WARN("read from invalid hglobal %p\n", This->supportHandle);
*pcbRead = 0;
return S_OK;
}
memcpy(pv, (char *) supportBuffer+This->currentPosition.u.LowPart, bytesToReadFromBuffer);
/*
* Move the current position to the new position
*/
This->currentPosition.u.LowPart+=bytesToReadFromBuffer;
/*
* Return the number of bytes read.
*/
*pcbRead = bytesToReadFromBuffer;
/*
* Cleanup
*/
GlobalUnlock(This->supportHandle);
/*
* Always returns S_OK even if the end of the stream is reached before the
* buffer is filled
*/
return S_OK;
}
/***
* This method is part of the ISequentialStream interface.
*
* It writes a block of information to the stream at the current
* position. It then moves the current position at the end of the
* written block. If the stream is too small to fit the block,
* the stream is grown to fit.
*
* See the documentation of ISequentialStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_Write(
IStream* iface,
const void* pv, /* [size_is][in] */
ULONG cb, /* [in] */
ULONG* pcbWritten) /* [out] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
void* supportBuffer;
ULARGE_INTEGER newSize;
ULONG bytesWritten = 0;
TRACE("(%p, %p, %d, %p)\n", iface, pv, cb, pcbWritten);
/*
* If the caller is not interested in the number of bytes written,
* we use another buffer to avoid "if" statements in the code.
*/
if (pcbWritten == 0)
pcbWritten = &bytesWritten;
if (cb == 0)
goto out;
*pcbWritten = 0;
newSize.u.HighPart = 0;
newSize.u.LowPart = This->currentPosition.u.LowPart + cb;
/*
* Verify if we need to grow the stream
*/
if (newSize.u.LowPart > This->streamSize.u.LowPart)
{
/* grow stream */
HRESULT hr = IStream_SetSize(iface, newSize);
if (FAILED(hr))
{
ERR("IStream_SetSize failed with error 0x%08x\n", hr);
return hr;
}
}
/*
* Lock the buffer in position and copy the data.
*/
supportBuffer = GlobalLock(This->supportHandle);
if (!supportBuffer)
{
WARN("write to invalid hglobal %p\n", This->supportHandle);
return S_OK;
}
memcpy((char *) supportBuffer+This->currentPosition.u.LowPart, pv, cb);
/*
* Move the current position to the new position
*/
This->currentPosition.u.LowPart+=cb;
/*
* Cleanup
*/
GlobalUnlock(This->supportHandle);
out:
/*
* Return the number of bytes read.
*/
*pcbWritten = cb;
return S_OK;
}
/***
* This method is part of the IStream interface.
*
* It will move the current stream pointer according to the parameters
* given.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_Seek(
IStream* iface,
LARGE_INTEGER dlibMove, /* [in] */
DWORD dwOrigin, /* [in] */
ULARGE_INTEGER* plibNewPosition) /* [out] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
ULARGE_INTEGER newPosition = This->currentPosition;
HRESULT hr = S_OK;
TRACE("(%p, %x%08x, %d, %p)\n", iface, dlibMove.u.HighPart,
dlibMove.u.LowPart, dwOrigin, plibNewPosition);
/*
* The file pointer is moved depending on the given "function"
* parameter.
*/
switch (dwOrigin)
{
case STREAM_SEEK_SET:
newPosition.u.HighPart = 0;
newPosition.u.LowPart = 0;
break;
case STREAM_SEEK_CUR:
break;
case STREAM_SEEK_END:
newPosition = This->streamSize;
break;
default:
hr = STG_E_SEEKERROR;
goto end;
}
/*
* Move the actual file pointer
* If the file pointer ends-up after the end of the stream, the next Write operation will
* make the file larger. This is how it is documented.
*/
newPosition.u.HighPart = 0;
newPosition.u.LowPart += dlibMove.QuadPart;
if (dlibMove.u.LowPart >= 0x80000000 &&
newPosition.u.LowPart >= dlibMove.u.LowPart)
{
/* We tried to seek backwards and went past the start. */
hr = STG_E_SEEKERROR;
goto end;
}
This->currentPosition = newPosition;
end:
if (plibNewPosition) *plibNewPosition = This->currentPosition;
return hr;
}
/***
* This method is part of the IStream interface.
*
* It will change the size of a stream.
*
* TODO: Switch from small blocks to big blocks and vice versa.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_SetSize(
IStream* iface,
ULARGE_INTEGER libNewSize) /* [in] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
HGLOBAL supportHandle;
TRACE("(%p, %d)\n", iface, libNewSize.u.LowPart);
/*
* HighPart is ignored as shown in tests
*/
if (This->streamSize.u.LowPart == libNewSize.u.LowPart)
return S_OK;
/*
* Re allocate the HGlobal to fit the new size of the stream.
*/
supportHandle = GlobalReAlloc(This->supportHandle, libNewSize.u.LowPart, 0);
if (supportHandle == 0)
return E_OUTOFMEMORY;
This->supportHandle = supportHandle;
This->streamSize.u.LowPart = libNewSize.u.LowPart;
return S_OK;
}
/***
* This method is part of the IStream interface.
*
* It will copy the 'cb' Bytes to 'pstm' IStream.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_CopyTo(
IStream* iface,
IStream* pstm, /* [unique][in] */
ULARGE_INTEGER cb, /* [in] */
ULARGE_INTEGER* pcbRead, /* [out] */
ULARGE_INTEGER* pcbWritten) /* [out] */
{
HRESULT hr = S_OK;
BYTE tmpBuffer[128];
ULONG bytesRead, bytesWritten, copySize;
ULARGE_INTEGER totalBytesRead;
ULARGE_INTEGER totalBytesWritten;
TRACE("(%p, %p, %d, %p, %p)\n", iface, pstm,
cb.u.LowPart, pcbRead, pcbWritten);
if ( pstm == 0 )
return STG_E_INVALIDPOINTER;
totalBytesRead.QuadPart = 0;
totalBytesWritten.QuadPart = 0;
while ( cb.QuadPart > 0 )
{
if ( cb.QuadPart >= sizeof(tmpBuffer) )
copySize = sizeof(tmpBuffer);
else
copySize = cb.u.LowPart;
hr = IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
if (FAILED(hr))
break;
totalBytesRead.QuadPart += bytesRead;
if (bytesRead)
{
hr = IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
if (FAILED(hr))
break;
totalBytesWritten.QuadPart += bytesWritten;
}
if (bytesRead!=copySize)
cb.QuadPart = 0;
else
cb.QuadPart -= bytesRead;
}
if (pcbRead) pcbRead->QuadPart = totalBytesRead.QuadPart;
if (pcbWritten) pcbWritten->QuadPart = totalBytesWritten.QuadPart;
return hr;
}
/***
* This method is part of the IStream interface.
*
* For streams supported by HGLOBALS, this function does nothing.
* This is what the documentation tells us.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_Commit(
IStream* iface,
DWORD grfCommitFlags) /* [in] */
{
return S_OK;
}
/***
* This method is part of the IStream interface.
*
* For streams supported by HGLOBALS, this function does nothing.
* This is what the documentation tells us.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_Revert(
IStream* iface)
{
return S_OK;
}
/***
* This method is part of the IStream interface.
*
* For streams supported by HGLOBALS, this function does nothing.
* This is what the documentation tells us.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_LockRegion(
IStream* iface,
ULARGE_INTEGER libOffset, /* [in] */
ULARGE_INTEGER cb, /* [in] */
DWORD dwLockType) /* [in] */
{
return STG_E_INVALIDFUNCTION;
}
/*
* This method is part of the IStream interface.
*
* For streams supported by HGLOBALS, this function does nothing.
* This is what the documentation tells us.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_UnlockRegion(
IStream* iface,
ULARGE_INTEGER libOffset, /* [in] */
ULARGE_INTEGER cb, /* [in] */
DWORD dwLockType) /* [in] */
{
return S_OK;
}
/***
* This method is part of the IStream interface.
*
* This method returns information about the current
* stream.
*
* See the documentation of IStream for more info.
*/
static HRESULT WINAPI HGLOBALStreamImpl_Stat(
IStream* iface,
STATSTG* pstatstg, /* [out] */
DWORD grfStatFlag) /* [in] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
memset(pstatstg, 0, sizeof(STATSTG));
pstatstg->pwcsName = NULL;
pstatstg->type = STGTY_STREAM;
pstatstg->cbSize = This->streamSize;
return S_OK;
}
static HRESULT WINAPI HGLOBALStreamImpl_Clone(
IStream* iface,
IStream** ppstm) /* [out] */
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
ULARGE_INTEGER dummy;
LARGE_INTEGER offset;
HRESULT hr;
TRACE(" Cloning %p (deleteOnRelease=%d seek position=%ld)\n",iface,This->deleteOnRelease,(long)This->currentPosition.QuadPart);
hr = CreateStreamOnHGlobal(This->supportHandle, FALSE, ppstm);
if(FAILED(hr))
return hr;
offset.QuadPart = (LONGLONG)This->currentPosition.QuadPart;
IStream_Seek(*ppstm, offset, STREAM_SEEK_SET, &dummy);
return S_OK;
}
static const IStreamVtbl HGLOBALStreamImplVtbl =
{
HGLOBALStreamImpl_QueryInterface,
HGLOBALStreamImpl_AddRef,
HGLOBALStreamImpl_Release,
HGLOBALStreamImpl_Read,
HGLOBALStreamImpl_Write,
HGLOBALStreamImpl_Seek,
HGLOBALStreamImpl_SetSize,
HGLOBALStreamImpl_CopyTo,
HGLOBALStreamImpl_Commit,
HGLOBALStreamImpl_Revert,
HGLOBALStreamImpl_LockRegion,
HGLOBALStreamImpl_UnlockRegion,
HGLOBALStreamImpl_Stat,
HGLOBALStreamImpl_Clone
};
/***********************************************************************
* CreateStreamOnHGlobal [OLE32.@]
*/
HRESULT WINAPI CreateStreamOnHGlobal(
HGLOBAL hGlobal,
BOOL fDeleteOnRelease,
LPSTREAM* ppstm)
{
HGLOBALStreamImpl* This;
if (!ppstm)
return E_INVALIDARG;
This = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALStreamImpl));
if (!This) return E_OUTOFMEMORY;
This->IStream_iface.lpVtbl = &HGLOBALStreamImplVtbl;
This->ref = 1;
/* initialize the support */
This->supportHandle = hGlobal;
This->deleteOnRelease = fDeleteOnRelease;
/* allocate a handle if one is not supplied */
if (!This->supportHandle)
This->supportHandle = GlobalAlloc(GMEM_MOVEABLE|GMEM_NODISCARD|GMEM_SHARE, 0);
/* start at the beginning */
This->currentPosition.u.HighPart = 0;
This->currentPosition.u.LowPart = 0;
/* initialize the size of the stream to the size of the handle */
This->streamSize.u.HighPart = 0;
This->streamSize.u.LowPart = GlobalSize(This->supportHandle);
*ppstm = &This->IStream_iface;
return S_OK;
}
/***********************************************************************
* GetHGlobalFromStream [OLE32.@]
*/
HRESULT WINAPI GetHGlobalFromStream(IStream* pstm, HGLOBAL* phglobal)
{
HGLOBALStreamImpl* pStream;
if (pstm == NULL)
return E_INVALIDARG;
pStream = (HGLOBALStreamImpl*) pstm;
/*
* Verify that the stream object was created with CreateStreamOnHGlobal.
*/
if (pStream->IStream_iface.lpVtbl == &HGLOBALStreamImplVtbl)
*phglobal = pStream->supportHandle;
else
{
*phglobal = 0;
return E_INVALIDARG;
}
return S_OK;
}
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