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Sweden-Number/dlls/ole32/memlockbytes16.c

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/*
* Global memory implementation of ILockBytes.
*
* Copyright 1999 Thuy Nguyen
*
* 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 <stdarg.h>
#include <string.h>
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "windef.h"
#include "winbase.h"
#include "wine/winbase16.h"
#include "winuser.h"
#include "objbase.h"
#include "ole2.h"
#include "winerror.h"
#include "ifs.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(ole);
/******************************************************************************
* HGLOBALLockBytesImpl16 definition.
*
* This class imlements the ILockBytes inteface and represents a byte array
* object supported by an HGLOBAL pointer.
*/
struct HGLOBALLockBytesImpl16
{
/*
* Needs to be the first item in the struct
* since we want to cast this in an ILockBytes pointer
*/
const ILockBytes16Vtbl *lpVtbl;
LONG ref;
/*
* Support for the LockBytes object
*/
HGLOBAL16 supportHandle;
/*
* This flag is TRUE if the HGLOBAL is destroyed when the object
* is finally released.
*/
BOOL deleteOnRelease;
/*
* Helper variable that contains the size of the byte array
*/
ULARGE_INTEGER byteArraySize;
};
typedef struct HGLOBALLockBytesImpl16 HGLOBALLockBytesImpl16;
/******************************************************************************
*
* HGLOBALLockBytesImpl16 implementation
*
*/
/******************************************************************************
* This is the constructor for the HGLOBALLockBytesImpl16 class.
*
* Params:
* hGlobal - Handle that will support the stream. can be NULL.
* fDeleteOnRelease - Flag set to TRUE if the HGLOBAL16 will be released
* when the IStream object is destroyed.
*/
static HGLOBALLockBytesImpl16*
HGLOBALLockBytesImpl16_Construct(HGLOBAL16 hGlobal,
BOOL16 fDeleteOnRelease)
{
HGLOBALLockBytesImpl16* newLockBytes;
static ILockBytes16Vtbl vt16;
static SEGPTR msegvt16;
HMODULE16 hcomp = GetModuleHandle16("OLE2");
TRACE("(%x,%d)\n",hGlobal,fDeleteOnRelease);
newLockBytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl16));
if (newLockBytes == NULL)
return NULL;
/*
* Set up the virtual function table and reference count.
*/
if (!msegvt16)
{
#define VTENT(x) vt16.x = (void*)GetProcAddress16(hcomp,"HGLOBALLockBytesImpl16_"#x);assert(vt16.x)
VTENT(QueryInterface);
VTENT(AddRef);
VTENT(Release);
VTENT(ReadAt);
VTENT(WriteAt);
VTENT(Flush);
VTENT(SetSize);
VTENT(LockRegion);
VTENT(UnlockRegion);
#undef VTENT
msegvt16 = MapLS( &vt16 );
}
newLockBytes->lpVtbl = (const ILockBytes16Vtbl*)msegvt16;
newLockBytes->ref = 0;
/*
* Initialize the support.
*/
newLockBytes->supportHandle = hGlobal;
newLockBytes->deleteOnRelease = fDeleteOnRelease;
/*
* This method will allocate a handle if one is not supplied.
*/
if (newLockBytes->supportHandle == 0)
newLockBytes->supportHandle = GlobalAlloc16(GMEM_MOVEABLE | GMEM_NODISCARD, 0);
/*
* Initialize the size of the array to the size of the handle.
*/
newLockBytes->byteArraySize.u.HighPart = 0;
newLockBytes->byteArraySize.u.LowPart = GlobalSize16(
newLockBytes->supportHandle);
return (HGLOBALLockBytesImpl16*)MapLS(newLockBytes);
}
/******************************************************************************
* This is the destructor of the HGLOBALStreamImpl class.
*
* This method will clean-up all the resources used-up by the given
* HGLOBALLockBytesImpl16 class. The pointer passed-in to this function will be
* freed and will not be valid anymore.
*/
static void HGLOBALLockBytesImpl16_Destroy(HGLOBALLockBytesImpl16* This)
{
TRACE("()\n");
/*
* Release the HGlobal if the constructor asked for that.
*/
if (This->deleteOnRelease)
{
GlobalFree16(This->supportHandle);
This->supportHandle = 0;
}
/*
* Finally, free the memory used-up by the class.
*/
HeapFree(GetProcessHeap(), 0, This);
}
/******************************************************************************
* This implements the IUnknown method AddRef for this
* class
*/
ULONG HGLOBALLockBytesImpl16_AddRef(ILockBytes16* iface)
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
TRACE("(%p)\n",This);
return InterlockedIncrement(&This->ref);
}
/******************************************************************************
* This implements the IUnknown method QueryInterface for this
* class
*/
HRESULT HGLOBALLockBytesImpl16_QueryInterface(
ILockBytes16* iface, /* [in] SEGPTR */
REFIID riid, /* [in] */
void** ppvObject) /* [out][iid_is] (ptr to SEGPTR!) */
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)MapSL((SEGPTR)iface);
TRACE("(%p,%s,%p)\n",iface,debugstr_guid(riid),ppvObject);
/*
* Perform a sanity check on the parameters.
*/
if (ppvObject==0)
return E_INVALIDARG;
/*
* Initialize the return parameter.
*/
*ppvObject = 0;
/*
* Compare the riid with the interface IDs implemented by this object.
*/
if ( !memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) ||
!memcmp(&IID_ILockBytes, riid, sizeof(IID_ILockBytes))
)
*ppvObject = (void*)iface;
/*
* Check that we obtained an interface.
*/
if ((*ppvObject)==0) {
FIXME("Unknown IID %s\n", debugstr_guid(riid));
return E_NOINTERFACE;
}
/*
* Query Interface always increases the reference count by one when it is
* successful
*/
HGLOBALLockBytesImpl16_AddRef((ILockBytes16*)This);
return S_OK;
}
/******************************************************************************
* This implements the IUnknown method Release for this
* class
*/
ULONG HGLOBALLockBytesImpl16_Release(ILockBytes16* iface)
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
ULONG ref;
TRACE("(%p)\n",This);
ref = InterlockedDecrement(&This->ref);
/*
* If the reference count goes down to 0, perform suicide.
*/
if (ref==0)
HGLOBALLockBytesImpl16_Destroy(This);
return ref;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* It reads a block of information from the byte array at the specified
* offset.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_ReadAt(
ILockBytes16* iface,
ULARGE_INTEGER ulOffset, /* [in] */
void* pv, /* [out][length_is][size_is] */
ULONG cb, /* [in] */
ULONG* pcbRead) /* [out] */
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
void* supportBuffer;
ULONG bytesReadBuffer = 0;
ULONG bytesToReadFromBuffer;
TRACE("(%p,%ld,%p,%ld,%p)\n",This,ulOffset.u.LowPart,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;
/*
* Make sure the offset is valid.
*/
if (ulOffset.u.LowPart > This->byteArraySize.u.LowPart)
return E_FAIL;
/*
* Using the known size of the array, calculate the number of bytes
* to read.
*/
bytesToReadFromBuffer = min(This->byteArraySize.u.LowPart -
ulOffset.u.LowPart, cb);
/*
* Lock the buffer in position and copy the data.
*/
supportBuffer = GlobalLock16(This->supportHandle);
memcpy(pv,
(char *) supportBuffer + ulOffset.u.LowPart,
bytesToReadFromBuffer);
/*
* Return the number of bytes read.
*/
*pcbRead = bytesToReadFromBuffer;
/*
* Cleanup
*/
GlobalUnlock16(This->supportHandle);
/*
* The function returns S_OK if the specified number of bytes were read
* or the end of the array was reached.
* It returns STG_E_READFAULT if the number of bytes to read does not equal
* the number of bytes actually read.
*/
if(*pcbRead == cb)
return S_OK;
return STG_E_READFAULT;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* It will change the size of the byte array.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_SetSize(
ILockBytes16* iface,
ULARGE_INTEGER libNewSize) /* [in] */
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
HGLOBAL16 supportHandle;
TRACE("(%p,%ld)\n",This,libNewSize.u.LowPart);
/*
* As documented.
*/
if (libNewSize.u.HighPart != 0)
return STG_E_INVALIDFUNCTION;
if (This->byteArraySize.u.LowPart == libNewSize.u.LowPart)
return S_OK;
/*
* Re allocate the HGlobal to fit the new size of the stream.
*/
supportHandle = GlobalReAlloc16(This->supportHandle, libNewSize.u.LowPart, 0);
if (supportHandle == 0)
return STG_E_MEDIUMFULL;
This->supportHandle = supportHandle;
This->byteArraySize.u.LowPart = libNewSize.u.LowPart;
return S_OK;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* It writes the specified bytes at the specified offset.
* position. If the array is too small, it will be resized.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_WriteAt(
ILockBytes16* iface,
ULARGE_INTEGER ulOffset, /* [in] */
const void* pv, /* [in][size_is] */
ULONG cb, /* [in] */
ULONG* pcbWritten) /* [out] */
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
void* supportBuffer;
ULARGE_INTEGER newSize;
ULONG bytesWritten = 0;
TRACE("(%p,%ld,%p,%ld,%p)\n",This,ulOffset.u.LowPart,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)
return S_OK;
newSize.u.HighPart = 0;
newSize.u.LowPart = ulOffset.u.LowPart + cb;
/*
* Verify if we need to grow the stream
*/
if (newSize.u.LowPart > This->byteArraySize.u.LowPart)
{
/* grow stream */
if (HGLOBALLockBytesImpl16_SetSize(iface, newSize) == STG_E_MEDIUMFULL)
return STG_E_MEDIUMFULL;
}
/*
* Lock the buffer in position and copy the data.
*/
supportBuffer = GlobalLock16(This->supportHandle);
memcpy((char *) supportBuffer + ulOffset.u.LowPart, pv, cb);
/*
* Return the number of bytes written.
*/
*pcbWritten = cb;
/*
* Cleanup
*/
GlobalUnlock16(This->supportHandle);
return S_OK;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_Flush(ILockBytes16* iface)
{
TRACE("(%p)\n",iface);
return S_OK;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* The global memory implementation of ILockBytes does not support locking.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_LockRegion(
ILockBytes16* iface,
ULARGE_INTEGER libOffset, /* [in] */
ULARGE_INTEGER cb, /* [in] */
DWORD dwLockType) /* [in] */
{
return STG_E_INVALIDFUNCTION;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* The global memory implementation of ILockBytes does not support locking.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_UnlockRegion(
ILockBytes16* iface,
ULARGE_INTEGER libOffset, /* [in] */
ULARGE_INTEGER cb, /* [in] */
DWORD dwLockType) /* [in] */
{
return STG_E_INVALIDFUNCTION;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* This method returns information about the current
* byte array object.
*
* See the documentation of ILockBytes for more info.
*/
HRESULT HGLOBALLockBytesImpl16_Stat(
ILockBytes16*iface,
STATSTG16* pstatstg, /* [out] */
DWORD grfStatFlag) /* [in] */
{
HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
memset(pstatstg, 0, sizeof(STATSTG16));
pstatstg->pwcsName = NULL;
pstatstg->type = STGTY_LOCKBYTES;
pstatstg->cbSize = This->byteArraySize;
return S_OK;
}
/******************************************************************************
* CreateILockBytesOnHGlobal [OLE2.54]
*
* Creates an ILockBytes interface for a HGLOBAL handle.
*
* PARAMS
* hGlobal the global handle (16bit)
* fDeleteOnRelease delete handle on release.
* ppLkbyt pointer to ILockBytes interface.
*
* RETURNS
* Staddard OLE error return codes.
*
*/
HRESULT WINAPI CreateILockBytesOnHGlobal16(
HGLOBAL16 hGlobal, /* [in] */
BOOL16 fDeleteOnRelease, /* [in] */
LPLOCKBYTES16 *ppLkbyt) /* [out] (ptr to SEGPTR!) */
{
HGLOBALLockBytesImpl16* newLockBytes; /* SEGPTR */
newLockBytes = HGLOBALLockBytesImpl16_Construct(hGlobal, fDeleteOnRelease);
if (newLockBytes != NULL)
return HGLOBALLockBytesImpl16_QueryInterface((ILockBytes16*)newLockBytes,
&IID_ILockBytes,
(void**)ppLkbyt);
return E_OUTOFMEMORY;
}
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