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528 lines
14 KiB
C
528 lines
14 KiB
C
/*
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* Global memory implementation of ILockBytes.
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*
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* Copyright 1999 Thuy Nguyen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdarg.h>
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#include <string.h>
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#define NONAMELESSUNION
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#define NONAMELESSSTRUCT
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#include "windef.h"
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#include "winbase.h"
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#include "wine/winbase16.h"
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#include "winuser.h"
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#include "objbase.h"
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#include "ole2.h"
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#include "winerror.h"
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#include "ifs.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(ole);
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/******************************************************************************
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* HGLOBALLockBytesImpl16 definition.
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*
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* This class implements the ILockBytes interface and represents a byte array
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* object supported by an HGLOBAL pointer.
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*/
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struct HGLOBALLockBytesImpl16
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{
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ILockBytes16 ILockBytes16_iface;
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LONG ref;
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/*
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* Support for the LockBytes object
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*/
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HGLOBAL16 supportHandle;
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/*
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* This flag is TRUE if the HGLOBAL is destroyed when the object
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* is finally released.
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*/
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BOOL deleteOnRelease;
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/*
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* Helper variable that contains the size of the byte array
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*/
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ULARGE_INTEGER byteArraySize;
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};
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typedef struct HGLOBALLockBytesImpl16 HGLOBALLockBytesImpl16;
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/******************************************************************************
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*
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* HGLOBALLockBytesImpl16 implementation
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*
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*/
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static inline HGLOBALLockBytesImpl16 *impl_from_ILockBytes16(ILockBytes16 *iface)
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{
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return CONTAINING_RECORD(iface, HGLOBALLockBytesImpl16, ILockBytes16_iface);
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}
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/******************************************************************************
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* This is the constructor for the HGLOBALLockBytesImpl16 class.
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*
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* Params:
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* hGlobal - Handle that will support the stream. can be NULL.
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* fDeleteOnRelease - Flag set to TRUE if the HGLOBAL16 will be released
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* when the IStream object is destroyed.
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*/
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static HGLOBALLockBytesImpl16*
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HGLOBALLockBytesImpl16_Construct(HGLOBAL16 hGlobal,
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BOOL16 fDeleteOnRelease)
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{
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HGLOBALLockBytesImpl16* newLockBytes;
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static ILockBytes16Vtbl vt16;
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static SEGPTR msegvt16;
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HMODULE16 hcomp = GetModuleHandle16("OLE2");
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TRACE("(%x,%d)\n",hGlobal,fDeleteOnRelease);
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newLockBytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl16));
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if (newLockBytes == NULL)
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return NULL;
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/*
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* Set up the virtual function table and reference count.
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*/
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if (!msegvt16)
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{
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#define VTENT(x) vt16.x = (void*)GetProcAddress16(hcomp,"HGLOBALLockBytesImpl16_"#x);assert(vt16.x)
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VTENT(QueryInterface);
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VTENT(AddRef);
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VTENT(Release);
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VTENT(ReadAt);
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VTENT(WriteAt);
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VTENT(Flush);
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VTENT(SetSize);
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VTENT(LockRegion);
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VTENT(UnlockRegion);
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VTENT(Stat);
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#undef VTENT
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msegvt16 = MapLS( &vt16 );
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}
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newLockBytes->ILockBytes16_iface.lpVtbl = (const ILockBytes16Vtbl*)msegvt16;
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newLockBytes->ref = 0;
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/*
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* Initialize the support.
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*/
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newLockBytes->supportHandle = hGlobal;
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newLockBytes->deleteOnRelease = fDeleteOnRelease;
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/*
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* This method will allocate a handle if one is not supplied.
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*/
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if (newLockBytes->supportHandle == 0)
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newLockBytes->supportHandle = GlobalAlloc16(GMEM_MOVEABLE | GMEM_NODISCARD, 0);
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/*
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* Initialize the size of the array to the size of the handle.
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*/
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newLockBytes->byteArraySize.u.HighPart = 0;
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newLockBytes->byteArraySize.u.LowPart = GlobalSize16(
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newLockBytes->supportHandle);
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return (HGLOBALLockBytesImpl16*)MapLS(newLockBytes);
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}
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/******************************************************************************
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* This is the destructor of the HGLOBALStreamImpl class.
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*
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* This method will clean-up all the resources used-up by the given
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* HGLOBALLockBytesImpl16 class. The pointer passed-in to this function will be
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* freed and will not be valid anymore.
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*/
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static void HGLOBALLockBytesImpl16_Destroy(HGLOBALLockBytesImpl16* This)
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{
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TRACE("()\n");
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/*
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* Release the HGlobal if the constructor asked for that.
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*/
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if (This->deleteOnRelease)
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{
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GlobalFree16(This->supportHandle);
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This->supportHandle = 0;
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}
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/*
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* Finally, free the memory used-up by the class.
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*/
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HeapFree(GetProcessHeap(), 0, This);
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}
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/******************************************************************************
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* This implements the IUnknown method AddRef for this
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* class
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*/
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ULONG CDECL HGLOBALLockBytesImpl16_AddRef(ILockBytes16* iface)
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{
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HGLOBALLockBytesImpl16* const This = impl_from_ILockBytes16(iface);
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TRACE("(%p)\n",This);
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return InterlockedIncrement(&This->ref);
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}
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/******************************************************************************
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* This implements the IUnknown method QueryInterface for this
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* class
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_QueryInterface(
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ILockBytes16* iface, /* [in] SEGPTR */
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REFIID riid, /* [in] */
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void** ppvObject) /* [out][iid_is] (ptr to SEGPTR!) */
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{
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HGLOBALLockBytesImpl16* const This = MapSL((SEGPTR)iface);
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TRACE("(%p,%s,%p)\n",iface,debugstr_guid(riid),ppvObject);
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/*
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* Perform a sanity check on the parameters.
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*/
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if (ppvObject==0)
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return E_INVALIDARG;
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/*
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* Initialize the return parameter.
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*/
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*ppvObject = 0;
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/*
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* Compare the riid with the interface IDs implemented by this object.
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*/
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if ( !memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) ||
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!memcmp(&IID_ILockBytes, riid, sizeof(IID_ILockBytes))
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)
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*ppvObject = (void*)iface;
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/*
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* Check that we obtained an interface.
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*/
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if ((*ppvObject)==0) {
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FIXME("Unknown IID %s\n", debugstr_guid(riid));
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return E_NOINTERFACE;
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}
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/*
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* Query Interface always increases the reference count by one when it is
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* successful
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*/
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HGLOBALLockBytesImpl16_AddRef(&This->ILockBytes16_iface);
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return S_OK;
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}
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/******************************************************************************
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* This implements the IUnknown method Release for this
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* class
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*/
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ULONG CDECL HGLOBALLockBytesImpl16_Release(ILockBytes16* iface)
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{
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HGLOBALLockBytesImpl16* const This = impl_from_ILockBytes16(iface);
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ULONG ref;
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TRACE("(%p)\n",This);
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ref = InterlockedDecrement(&This->ref);
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/*
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* If the reference count goes down to 0, perform suicide.
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*/
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if (ref==0)
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HGLOBALLockBytesImpl16_Destroy(This);
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return ref;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* It reads a block of information from the byte array at the specified
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* offset.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_ReadAt(
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ILockBytes16* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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void* pv, /* [out][length_is][size_is] */
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ULONG cb, /* [in] */
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ULONG* pcbRead) /* [out] */
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{
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HGLOBALLockBytesImpl16* const This = impl_from_ILockBytes16(iface);
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void* supportBuffer;
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ULONG bytesReadBuffer = 0;
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ULONG bytesToReadFromBuffer;
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TRACE("(%p,%d,%p,%d,%p)\n",This,ulOffset.u.LowPart,pv,cb,pcbRead);
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/*
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* If the caller is not interested in the number of bytes read,
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* we use another buffer to avoid "if" statements in the code.
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*/
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if (pcbRead == 0)
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pcbRead = &bytesReadBuffer;
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/*
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* Make sure the offset is valid.
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*/
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if (ulOffset.u.LowPart > This->byteArraySize.u.LowPart)
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return E_FAIL;
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/*
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* Using the known size of the array, calculate the number of bytes
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* to read.
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*/
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bytesToReadFromBuffer = min(This->byteArraySize.u.LowPart -
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ulOffset.u.LowPart, cb);
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/*
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* Lock the buffer in position and copy the data.
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*/
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supportBuffer = GlobalLock16(This->supportHandle);
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memcpy(pv,
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(char *) supportBuffer + ulOffset.u.LowPart,
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bytesToReadFromBuffer);
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/*
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* Return the number of bytes read.
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*/
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*pcbRead = bytesToReadFromBuffer;
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/*
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* Cleanup
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*/
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GlobalUnlock16(This->supportHandle);
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/*
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* The function returns S_OK if the specified number of bytes were read
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* or the end of the array was reached.
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* It returns STG_E_READFAULT if the number of bytes to read does not equal
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* the number of bytes actually read.
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*/
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if(*pcbRead == cb)
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return S_OK;
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return STG_E_READFAULT;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* It will change the size of the byte array.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_SetSize(
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ILockBytes16* iface,
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ULARGE_INTEGER libNewSize) /* [in] */
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{
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HGLOBALLockBytesImpl16* const This = impl_from_ILockBytes16(iface);
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HGLOBAL16 supportHandle;
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TRACE("(%p,%d)\n",This,libNewSize.u.LowPart);
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/*
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* As documented.
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*/
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if (libNewSize.u.HighPart != 0)
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return STG_E_INVALIDFUNCTION;
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if (This->byteArraySize.u.LowPart == libNewSize.u.LowPart)
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return S_OK;
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/*
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* Re allocate the HGlobal to fit the new size of the stream.
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*/
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supportHandle = GlobalReAlloc16(This->supportHandle, libNewSize.u.LowPart, 0);
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if (supportHandle == 0)
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return STG_E_MEDIUMFULL;
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This->supportHandle = supportHandle;
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This->byteArraySize.u.LowPart = libNewSize.u.LowPart;
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return S_OK;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* It writes the specified bytes at the specified offset.
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* position. If the array is too small, it will be resized.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_WriteAt(
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ILockBytes16* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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const void* pv, /* [in][size_is] */
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ULONG cb, /* [in] */
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ULONG* pcbWritten) /* [out] */
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{
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HGLOBALLockBytesImpl16* const This = impl_from_ILockBytes16(iface);
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void* supportBuffer;
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ULARGE_INTEGER newSize;
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ULONG bytesWritten = 0;
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TRACE("(%p,%d,%p,%d,%p)\n",This,ulOffset.u.LowPart,pv,cb,pcbWritten);
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/*
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* If the caller is not interested in the number of bytes written,
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* we use another buffer to avoid "if" statements in the code.
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*/
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if (pcbWritten == 0)
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pcbWritten = &bytesWritten;
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if (cb == 0)
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return S_OK;
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newSize.u.HighPart = 0;
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newSize.u.LowPart = ulOffset.u.LowPart + cb;
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/*
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* Verify if we need to grow the stream
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*/
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if (newSize.u.LowPart > This->byteArraySize.u.LowPart)
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{
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/* grow stream */
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if (HGLOBALLockBytesImpl16_SetSize(iface, newSize) == STG_E_MEDIUMFULL)
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return STG_E_MEDIUMFULL;
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}
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/*
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* Lock the buffer in position and copy the data.
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*/
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supportBuffer = GlobalLock16(This->supportHandle);
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memcpy((char *) supportBuffer + ulOffset.u.LowPart, pv, cb);
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/*
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* Return the number of bytes written.
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*/
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*pcbWritten = cb;
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/*
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* Cleanup
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*/
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GlobalUnlock16(This->supportHandle);
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return S_OK;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_Flush(ILockBytes16* iface)
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{
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TRACE("(%p)\n",iface);
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return S_OK;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* The global memory implementation of ILockBytes does not support locking.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_LockRegion(
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ILockBytes16* iface,
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ULARGE_INTEGER libOffset, /* [in] */
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ULARGE_INTEGER cb, /* [in] */
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DWORD dwLockType) /* [in] */
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{
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return STG_E_INVALIDFUNCTION;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* The global memory implementation of ILockBytes does not support locking.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_UnlockRegion(
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ILockBytes16* iface,
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ULARGE_INTEGER libOffset, /* [in] */
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ULARGE_INTEGER cb, /* [in] */
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DWORD dwLockType) /* [in] */
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{
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return STG_E_INVALIDFUNCTION;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* This method returns information about the current
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* byte array object.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT CDECL HGLOBALLockBytesImpl16_Stat(
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ILockBytes16*iface,
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STATSTG16* pstatstg, /* [out] */
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DWORD grfStatFlag) /* [in] */
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{
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HGLOBALLockBytesImpl16* const This = impl_from_ILockBytes16(iface);
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memset(pstatstg, 0, sizeof(STATSTG16));
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pstatstg->pwcsName = NULL;
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pstatstg->type = STGTY_LOCKBYTES;
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pstatstg->cbSize = This->byteArraySize;
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return S_OK;
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}
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/******************************************************************************
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* CreateILockBytesOnHGlobal [OLE2.54]
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*
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* Creates an ILockBytes interface for a HGLOBAL handle.
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*
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* PARAMS
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* hGlobal the global handle (16bit)
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* fDeleteOnRelease delete handle on release.
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* ppLkbyt pointer to ILockBytes interface.
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*
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* RETURNS
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* Staddard OLE error return codes.
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*
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*/
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HRESULT WINAPI CreateILockBytesOnHGlobal16(
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HGLOBAL16 hGlobal, /* [in] */
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BOOL16 fDeleteOnRelease, /* [in] */
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LPLOCKBYTES16 *ppLkbyt) /* [out] (ptr to SEGPTR!) */
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{
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HGLOBALLockBytesImpl16* newLockBytes; /* SEGPTR */
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newLockBytes = HGLOBALLockBytesImpl16_Construct(hGlobal, fDeleteOnRelease);
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if (newLockBytes != NULL)
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return HGLOBALLockBytesImpl16_QueryInterface(&newLockBytes->ILockBytes16_iface,
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&IID_ILockBytes, (void**)ppLkbyt);
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return E_OUTOFMEMORY;
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}
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