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496 lines
14 KiB
C
496 lines
14 KiB
C
/******************************************************************************
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*
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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 "precomp.h"
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WINE_DEFAULT_DEBUG_CHANNEL(ole);
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/******************************************************************************
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* HGLOBALLockBytesImpl 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 HGLOBALLockBytesImpl
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{
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ILockBytes ILockBytes_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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HGLOBAL 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 HGLOBALLockBytesImpl HGLOBALLockBytesImpl;
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static inline HGLOBALLockBytesImpl *impl_from_ILockBytes( ILockBytes *iface )
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{
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return CONTAINING_RECORD(iface, HGLOBALLockBytesImpl, ILockBytes_iface);
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}
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static const ILockBytesVtbl HGLOBALLockBytesImpl_Vtbl;
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/******************************************************************************
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* CreateILockBytesOnHGlobal [OLE32.@]
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*
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* Create a byte array object which is intended to be the compound file foundation.
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* This object supports a COM implementation of the ILockBytes interface.
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*
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* PARAMS
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* global [ I] Global memory handle
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* delete_on_release [ I] Whether the handle should be freed when the object is released.
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* ret [ O] Address of ILockBytes pointer that receives
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* the interface pointer to the new byte array object.
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*
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* RETURNS
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* Success: S_OK
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*
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* NOTES
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* The supplied ILockBytes pointer can be used by the StgCreateDocfileOnILockBytes
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* function to build a compound file on top of this byte array object.
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* The ILockBytes interface instance calls the GlobalReAlloc function to grow
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* the memory block as required.
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*/
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HRESULT WINAPI CreateILockBytesOnHGlobal(HGLOBAL global, BOOL delete_on_release, ILockBytes **ret)
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{
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HGLOBALLockBytesImpl* lockbytes;
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lockbytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl));
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if (!lockbytes) return E_OUTOFMEMORY;
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lockbytes->ILockBytes_iface.lpVtbl = &HGLOBALLockBytesImpl_Vtbl;
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lockbytes->ref = 1;
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/*
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* Initialize the support.
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*/
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lockbytes->supportHandle = global;
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lockbytes->deleteOnRelease = delete_on_release;
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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 (lockbytes->supportHandle == 0)
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lockbytes->supportHandle = GlobalAlloc(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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lockbytes->byteArraySize.u.HighPart = 0;
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lockbytes->byteArraySize.u.LowPart = GlobalSize(lockbytes->supportHandle);
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*ret = &lockbytes->ILockBytes_iface;
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return S_OK;
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}
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/******************************************************************************
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* GetHGlobalFromILockBytes [OLE32.@]
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*
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* Retrieve a global memory handle to a byte array object created
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* using the CreateILockBytesOnHGlobal function.
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*
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* PARAMS
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* plkbyt [ I] Pointer to the ILockBytes interface on byte array object
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* phglobal [ O] Address to store a global memory handle
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* RETURNS
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* S_OK if *phglobal has a correct value
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* E_INVALIDARG if any parameters are invalid
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*
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*/
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HRESULT WINAPI GetHGlobalFromILockBytes(ILockBytes* iface, HGLOBAL* phglobal)
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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STATSTG stbuf;
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HRESULT hres;
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ULARGE_INTEGER start;
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ULONG xread;
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*phglobal = 0;
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if (This->ILockBytes_iface.lpVtbl == &HGLOBALLockBytesImpl_Vtbl) {
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*phglobal = This->supportHandle;
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if (*phglobal == 0)
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return E_INVALIDARG;
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return S_OK;
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}
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/* It is not our lockbytes implementation, so use a more generic way */
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hres = ILockBytes_Stat(iface,&stbuf,STATFLAG_NONAME);
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if (hres != S_OK) {
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ERR("Cannot ILockBytes_Stat, %x\n",hres);
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return hres;
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}
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TRACE("cbSize is %s\n", wine_dbgstr_longlong(stbuf.cbSize.QuadPart));
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*phglobal = GlobalAlloc( GMEM_MOVEABLE|GMEM_SHARE, stbuf.cbSize.u.LowPart);
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if (!*phglobal)
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return E_INVALIDARG;
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memset(&start,0,sizeof(start));
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hres = ILockBytes_ReadAt(iface, start, GlobalLock(*phglobal), stbuf.cbSize.u.LowPart, &xread);
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GlobalUnlock(*phglobal);
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if (hres != S_OK) {
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FIXME("%p->ReadAt failed with %x\n",iface,hres);
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return hres;
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}
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if (stbuf.cbSize.u.LowPart != xread) {
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FIXME("Read size is not requested size %d vs %d?\n",stbuf.cbSize.u.LowPart, xread);
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}
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return S_OK;
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}
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/******************************************************************************
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*
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* HGLOBALLockBytesImpl implementation
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*
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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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static HRESULT WINAPI HGLOBALLockBytesImpl_QueryInterface(
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ILockBytes* iface,
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REFIID riid, /* [in] */
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void** ppvObject) /* [iid_is][out] */
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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if (ppvObject==0)
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return E_INVALIDARG;
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*ppvObject = 0;
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if (IsEqualIID(riid, &IID_IUnknown) ||
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IsEqualIID(riid, &IID_ILockBytes))
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{
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*ppvObject = &This->ILockBytes_iface;
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}
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else
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return E_NOINTERFACE;
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ILockBytes_AddRef(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 AddRef for this
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* class
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*/
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static ULONG WINAPI HGLOBALLockBytesImpl_AddRef(ILockBytes* iface)
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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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 Release for this
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* class
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*/
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static ULONG WINAPI HGLOBALLockBytesImpl_Release(ILockBytes* iface)
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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ULONG ref;
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ref = InterlockedDecrement(&This->ref);
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if (!ref)
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{
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if (This->deleteOnRelease)
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{
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GlobalFree(This->supportHandle);
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This->supportHandle = 0;
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}
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HeapFree(GetProcessHeap(), 0, This);
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}
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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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static HRESULT WINAPI HGLOBALLockBytesImpl_ReadAt(
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ILockBytes* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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void* pv, /* [length_is][size_is][out] */
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ULONG cb, /* [in] */
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ULONG* pcbRead) /* [out] */
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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void* supportBuffer;
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ULONG bytesReadBuffer = 0;
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ULONG bytesToReadFromBuffer;
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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 = GlobalLock(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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GlobalUnlock(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 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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static HRESULT WINAPI HGLOBALLockBytesImpl_WriteAt(
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ILockBytes* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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const void* pv, /* [size_is][in] */
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ULONG cb, /* [in] */
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ULONG* pcbWritten) /* [out] */
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(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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/*
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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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{
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return S_OK;
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}
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else
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{
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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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/*
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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 (ILockBytes_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 = GlobalLock(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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GlobalUnlock(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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static HRESULT WINAPI HGLOBALLockBytesImpl_Flush(ILockBytes* iface)
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{
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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 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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static HRESULT WINAPI HGLOBALLockBytesImpl_SetSize(
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ILockBytes* iface,
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ULARGE_INTEGER libNewSize) /* [in] */
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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HGLOBAL supportHandle;
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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 = GlobalReAlloc(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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* 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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static HRESULT WINAPI HGLOBALLockBytesImpl_LockRegion(
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ILockBytes* 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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static HRESULT WINAPI HGLOBALLockBytesImpl_UnlockRegion(
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ILockBytes* 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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static HRESULT WINAPI HGLOBALLockBytesImpl_Stat(
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ILockBytes* iface,
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STATSTG* pstatstg, /* [out] */
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DWORD grfStatFlag) /* [in] */
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{
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HGLOBALLockBytesImpl* This = impl_from_ILockBytes(iface);
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memset(pstatstg, 0, sizeof(STATSTG));
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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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* Virtual function table for the HGLOBALLockBytesImpl class.
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*/
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static const ILockBytesVtbl HGLOBALLockBytesImpl_Vtbl =
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{
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HGLOBALLockBytesImpl_QueryInterface,
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HGLOBALLockBytesImpl_AddRef,
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HGLOBALLockBytesImpl_Release,
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HGLOBALLockBytesImpl_ReadAt,
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HGLOBALLockBytesImpl_WriteAt,
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HGLOBALLockBytesImpl_Flush,
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HGLOBALLockBytesImpl_SetSize,
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HGLOBALLockBytesImpl_LockRegion,
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HGLOBALLockBytesImpl_UnlockRegion,
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HGLOBALLockBytesImpl_Stat,
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};
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