1022 lines
25 KiB
C
1022 lines
25 KiB
C
/*
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* Compound Storage (32 bit version)
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* Stream implementation
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*
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* This file contains the implementation of the stream interface
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* for streams contained in a compound storage.
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*
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* Copyright 1999 Francis Beaudet
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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 <assert.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#define COBJMACROS
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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 "winerror.h"
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#include "winternl.h"
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#include "wine/debug.h"
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#include "storage32.h"
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WINE_DEFAULT_DEBUG_CHANNEL(storage);
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/***
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* This is the destructor of the StgStreamImpl class.
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*
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* This method will clean-up all the resources used-up by the given StgStreamImpl
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* class. The pointer passed-in to this function will be freed and will not
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* be valid anymore.
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*/
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static void StgStreamImpl_Destroy(StgStreamImpl* This)
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{
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TRACE("(%p)\n", This);
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/*
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* Release the reference we are holding on the parent storage.
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* IStorage_Release((IStorage*)This->parentStorage);
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*
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* No, don't do this. Some apps call IStorage_Release without
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* calling IStream_Release first. If we grab a reference the
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* file is not closed, and the app fails when it tries to
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* reopen the file (Easy-PC, for example). Just inform the
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* storage that we have closed the stream
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*/
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if(This->parentStorage) {
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StorageBaseImpl_RemoveStream(This->parentStorage, This);
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}
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This->parentStorage = 0;
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/*
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* Make sure we clean-up the block chain stream objects that we were using.
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*/
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if (This->bigBlockChain != 0)
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{
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BlockChainStream_Destroy(This->bigBlockChain);
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This->bigBlockChain = 0;
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}
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if (This->smallBlockChain != 0)
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{
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SmallBlockChainStream_Destroy(This->smallBlockChain);
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This->smallBlockChain = 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 QueryInterface for this
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* class
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*/
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static HRESULT WINAPI StgStreamImpl_QueryInterface(
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IStream* 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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StgStreamImpl* const This=(StgStreamImpl*)iface;
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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 (IsEqualIID(&IID_IUnknown, riid) ||
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IsEqualIID(&IID_IPersist, riid) ||
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IsEqualIID(&IID_IPersistStream, riid) ||
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IsEqualIID(&IID_ISequentialStream, riid) ||
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IsEqualIID(&IID_IStream, riid))
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{
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*ppvObject = This;
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}
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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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return E_NOINTERFACE;
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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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IStream_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 StgStreamImpl_AddRef(
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IStream* iface)
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{
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StgStreamImpl* const This=(StgStreamImpl*)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 StgStreamImpl_Release(
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IStream* iface)
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{
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StgStreamImpl* const This=(StgStreamImpl*)iface;
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ULONG ref;
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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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{
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StgStreamImpl_Destroy(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 will open the block chain pointed by the directory entry
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* that describes the stream.
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* If the stream's size is null, no chain is opened.
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*/
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static void StgStreamImpl_OpenBlockChain(
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StgStreamImpl* This)
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{
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DirEntry currentEntry;
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BOOL readSuccessful;
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/*
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* Make sure no old object is left over.
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*/
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if (This->smallBlockChain != 0)
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{
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SmallBlockChainStream_Destroy(This->smallBlockChain);
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This->smallBlockChain = 0;
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}
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if (This->bigBlockChain != 0)
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{
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BlockChainStream_Destroy(This->bigBlockChain);
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This->bigBlockChain = 0;
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}
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/*
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* Read the information from the directory entry.
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*/
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readSuccessful = StorageImpl_ReadDirEntry(This->parentStorage->ancestorStorage,
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This->dirEntry,
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¤tEntry);
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if (readSuccessful)
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{
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This->streamSize = currentEntry.size;
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/*
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* This code supports only streams that are <32 bits in size.
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*/
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assert(This->streamSize.u.HighPart == 0);
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if(currentEntry.startingBlock == BLOCK_END_OF_CHAIN)
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{
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assert( (This->streamSize.u.HighPart == 0) && (This->streamSize.u.LowPart == 0) );
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}
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else
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{
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if ( (This->streamSize.u.HighPart == 0) &&
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(This->streamSize.u.LowPart < LIMIT_TO_USE_SMALL_BLOCK) )
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{
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This->smallBlockChain = SmallBlockChainStream_Construct(
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This->parentStorage->ancestorStorage,
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NULL,
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This->dirEntry);
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}
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else
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{
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This->bigBlockChain = BlockChainStream_Construct(
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This->parentStorage->ancestorStorage,
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NULL,
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This->dirEntry);
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}
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}
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}
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}
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/***
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* This method is part of the ISequentialStream interface.
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*
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* It reads a block of information from the stream at the current
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* position. It then moves the current position at the end of the
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* read block
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*
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* See the documentation of ISequentialStream for more info.
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*/
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static HRESULT WINAPI StgStreamImpl_Read(
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IStream* iface,
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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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StgStreamImpl* const This=(StgStreamImpl*)iface;
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ULONG bytesReadBuffer;
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ULONG bytesToReadFromBuffer;
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HRESULT res;
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TRACE("(%p, %p, %d, %p)\n",
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iface, pv, cb, pcbRead);
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if (!This->parentStorage)
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{
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WARN("storage reverted\n");
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return STG_E_REVERTED;
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}
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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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* Using the known size of the stream, calculate the number of bytes
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* to read from the block chain
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*/
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bytesToReadFromBuffer = min( This->streamSize.u.LowPart - This->currentPosition.u.LowPart, cb);
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/*
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* Depending on the type of chain that was opened when the stream was constructed,
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* we delegate the work to the method that reads the block chains.
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*/
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if (This->smallBlockChain!=0)
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{
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res = SmallBlockChainStream_ReadAt(This->smallBlockChain,
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This->currentPosition,
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bytesToReadFromBuffer,
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pv,
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pcbRead);
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}
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else if (This->bigBlockChain!=0)
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{
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res = BlockChainStream_ReadAt(This->bigBlockChain,
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This->currentPosition,
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bytesToReadFromBuffer,
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pv,
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pcbRead);
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}
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else
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{
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/*
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* Small and big block chains are both NULL. This case will happen
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* when a stream starts with BLOCK_END_OF_CHAIN and has size zero.
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*/
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*pcbRead = 0;
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res = S_OK;
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goto end;
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}
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if (SUCCEEDED(res))
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{
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/*
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* We should always be able to read the proper amount of data from the
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* chain.
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*/
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assert(bytesToReadFromBuffer == *pcbRead);
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/*
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* Advance the pointer for the number of positions read.
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*/
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This->currentPosition.u.LowPart += *pcbRead;
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}
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end:
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TRACE("<-- %08x\n", res);
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return res;
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}
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/***
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* This method is part of the ISequentialStream interface.
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*
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* It writes a block of information to the stream at the current
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* position. It then moves the current position at the end of the
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* written block. If the stream is too small to fit the block,
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* the stream is grown to fit.
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*
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* See the documentation of ISequentialStream for more info.
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*/
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static HRESULT WINAPI StgStreamImpl_Write(
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IStream* iface,
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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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StgStreamImpl* const This=(StgStreamImpl*)iface;
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ULARGE_INTEGER newSize;
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ULONG bytesWritten = 0;
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HRESULT res;
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TRACE("(%p, %p, %d, %p)\n",
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iface, pv, cb, pcbWritten);
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|
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/*
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* Do we have permission to write to this stream?
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*/
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switch(STGM_ACCESS_MODE(This->grfMode))
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{
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case STGM_WRITE:
|
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case STGM_READWRITE:
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break;
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default:
|
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WARN("access denied by flags: 0x%x\n", STGM_ACCESS_MODE(This->grfMode));
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return STG_E_ACCESSDENIED;
|
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}
|
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if (!pv)
|
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return STG_E_INVALIDPOINTER;
|
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|
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if (!This->parentStorage)
|
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{
|
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WARN("storage reverted\n");
|
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return STG_E_REVERTED;
|
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}
|
|
|
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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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if (pcbWritten == 0)
|
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pcbWritten = &bytesWritten;
|
|
|
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/*
|
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* Initialize the out parameter
|
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*/
|
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*pcbWritten = 0;
|
|
|
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if (cb == 0)
|
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{
|
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TRACE("<-- S_OK, written 0\n");
|
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return S_OK;
|
|
}
|
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else
|
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{
|
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newSize.u.HighPart = 0;
|
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newSize.u.LowPart = This->currentPosition.u.LowPart + cb;
|
|
}
|
|
|
|
/*
|
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* Verify if we need to grow the stream
|
|
*/
|
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if (newSize.u.LowPart > This->streamSize.u.LowPart)
|
|
{
|
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/* grow stream */
|
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res = IStream_SetSize(iface, newSize);
|
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if (FAILED(res))
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Depending on the type of chain that was opened when the stream was constructed,
|
|
* we delegate the work to the method that readwrites to the block chains.
|
|
*/
|
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if (This->smallBlockChain!=0)
|
|
{
|
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res = SmallBlockChainStream_WriteAt(This->smallBlockChain,
|
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This->currentPosition,
|
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cb,
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pv,
|
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pcbWritten);
|
|
|
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}
|
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else if (This->bigBlockChain!=0)
|
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{
|
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res = BlockChainStream_WriteAt(This->bigBlockChain,
|
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This->currentPosition,
|
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cb,
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pv,
|
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pcbWritten);
|
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}
|
|
else
|
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{
|
|
/* this should never happen because the IStream_SetSize call above will
|
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* make sure a big or small block chain is created */
|
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assert(FALSE);
|
|
res = 0;
|
|
}
|
|
|
|
/*
|
|
* Advance the position pointer for the number of positions written.
|
|
*/
|
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This->currentPosition.u.LowPart += *pcbWritten;
|
|
|
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TRACE("<-- S_OK, written %u\n", *pcbWritten);
|
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return res;
|
|
}
|
|
|
|
/***
|
|
* 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.
|
|
*/
|
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static HRESULT WINAPI StgStreamImpl_Seek(
|
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IStream* iface,
|
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LARGE_INTEGER dlibMove, /* [in] */
|
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DWORD dwOrigin, /* [in] */
|
|
ULARGE_INTEGER* plibNewPosition) /* [out] */
|
|
{
|
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StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
|
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ULARGE_INTEGER newPosition;
|
|
|
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TRACE("(%p, %d, %d, %p)\n",
|
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iface, dlibMove.u.LowPart, dwOrigin, plibNewPosition);
|
|
|
|
/*
|
|
* fail if the stream has no parent (as does windows)
|
|
*/
|
|
|
|
if (!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
/*
|
|
* The caller is allowed to pass in NULL as the new position return value.
|
|
* If it happens, we assign it to a dynamic variable to avoid special cases
|
|
* in the code below.
|
|
*/
|
|
if (plibNewPosition == 0)
|
|
{
|
|
plibNewPosition = &newPosition;
|
|
}
|
|
|
|
/*
|
|
* The file pointer is moved depending on the given "function"
|
|
* parameter.
|
|
*/
|
|
switch (dwOrigin)
|
|
{
|
|
case STREAM_SEEK_SET:
|
|
plibNewPosition->u.HighPart = 0;
|
|
plibNewPosition->u.LowPart = 0;
|
|
break;
|
|
case STREAM_SEEK_CUR:
|
|
*plibNewPosition = This->currentPosition;
|
|
break;
|
|
case STREAM_SEEK_END:
|
|
*plibNewPosition = This->streamSize;
|
|
break;
|
|
default:
|
|
WARN("invalid dwOrigin %d\n", dwOrigin);
|
|
return STG_E_INVALIDFUNCTION;
|
|
}
|
|
|
|
plibNewPosition->QuadPart += dlibMove.QuadPart;
|
|
|
|
/*
|
|
* tell the caller what we calculated
|
|
*/
|
|
This->currentPosition = *plibNewPosition;
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
/***
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* It will change the size of a stream.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
static HRESULT WINAPI StgStreamImpl_SetSize(
|
|
IStream* iface,
|
|
ULARGE_INTEGER libNewSize) /* [in] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
|
|
DirEntry currentEntry;
|
|
BOOL Success;
|
|
|
|
TRACE("(%p, %d)\n", iface, libNewSize.u.LowPart);
|
|
|
|
if(!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
/*
|
|
* As documented.
|
|
*/
|
|
if (libNewSize.u.HighPart != 0)
|
|
{
|
|
WARN("invalid value for libNewSize.u.HighPart %d\n", libNewSize.u.HighPart);
|
|
return STG_E_INVALIDFUNCTION;
|
|
}
|
|
|
|
/*
|
|
* Do we have permission?
|
|
*/
|
|
if (!(This->grfMode & (STGM_WRITE | STGM_READWRITE)))
|
|
{
|
|
WARN("access denied\n");
|
|
return STG_E_ACCESSDENIED;
|
|
}
|
|
|
|
/* In simple mode keep the stream size above the small block limit */
|
|
if (This->parentStorage->ancestorStorage->base.openFlags & STGM_SIMPLE)
|
|
libNewSize.u.LowPart = max(libNewSize.u.LowPart, LIMIT_TO_USE_SMALL_BLOCK);
|
|
|
|
if (This->streamSize.u.LowPart == libNewSize.u.LowPart)
|
|
return S_OK;
|
|
|
|
/*
|
|
* This will happen if we're creating a stream
|
|
*/
|
|
if ((This->smallBlockChain == 0) && (This->bigBlockChain == 0))
|
|
{
|
|
if (libNewSize.u.LowPart < LIMIT_TO_USE_SMALL_BLOCK)
|
|
{
|
|
This->smallBlockChain = SmallBlockChainStream_Construct(
|
|
This->parentStorage->ancestorStorage,
|
|
NULL,
|
|
This->dirEntry);
|
|
}
|
|
else
|
|
{
|
|
This->bigBlockChain = BlockChainStream_Construct(
|
|
This->parentStorage->ancestorStorage,
|
|
NULL,
|
|
This->dirEntry);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Read this stream's size to see if it's small blocks or big blocks
|
|
*/
|
|
Success = StorageImpl_ReadDirEntry(This->parentStorage->ancestorStorage,
|
|
This->dirEntry,
|
|
¤tEntry);
|
|
/*
|
|
* Determine if we have to switch from small to big blocks or vice versa
|
|
*/
|
|
if ( (This->smallBlockChain!=0) &&
|
|
(currentEntry.size.u.LowPart < LIMIT_TO_USE_SMALL_BLOCK) )
|
|
{
|
|
if (libNewSize.u.LowPart >= LIMIT_TO_USE_SMALL_BLOCK)
|
|
{
|
|
/*
|
|
* Transform the small block chain into a big block chain
|
|
*/
|
|
This->bigBlockChain = Storage32Impl_SmallBlocksToBigBlocks(
|
|
This->parentStorage->ancestorStorage,
|
|
&This->smallBlockChain);
|
|
}
|
|
}
|
|
else if ( (This->bigBlockChain!=0) &&
|
|
(currentEntry.size.u.LowPart >= LIMIT_TO_USE_SMALL_BLOCK) )
|
|
{
|
|
if (libNewSize.u.LowPart < LIMIT_TO_USE_SMALL_BLOCK)
|
|
{
|
|
/*
|
|
* Transform the big block chain into a small block chain
|
|
*/
|
|
This->smallBlockChain = Storage32Impl_BigBlocksToSmallBlocks(
|
|
This->parentStorage->ancestorStorage,
|
|
&This->bigBlockChain);
|
|
}
|
|
}
|
|
|
|
if (This->smallBlockChain!=0)
|
|
{
|
|
Success = SmallBlockChainStream_SetSize(This->smallBlockChain, libNewSize);
|
|
}
|
|
else
|
|
{
|
|
Success = BlockChainStream_SetSize(This->bigBlockChain, libNewSize);
|
|
}
|
|
|
|
/*
|
|
* Write the new information about this stream to the directory entry
|
|
*/
|
|
Success = StorageImpl_ReadDirEntry(This->parentStorage->ancestorStorage,
|
|
This->dirEntry,
|
|
¤tEntry);
|
|
|
|
currentEntry.size.u.HighPart = libNewSize.u.HighPart;
|
|
currentEntry.size.u.LowPart = libNewSize.u.LowPart;
|
|
|
|
if (Success)
|
|
{
|
|
StorageImpl_WriteDirEntry(This->parentStorage->ancestorStorage,
|
|
This->dirEntry,
|
|
¤tEntry);
|
|
}
|
|
|
|
This->streamSize = libNewSize;
|
|
|
|
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 StgStreamImpl_CopyTo(
|
|
IStream* iface,
|
|
IStream* pstm, /* [unique][in] */
|
|
ULARGE_INTEGER cb, /* [in] */
|
|
ULARGE_INTEGER* pcbRead, /* [out] */
|
|
ULARGE_INTEGER* pcbWritten) /* [out] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
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);
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
|
|
if (!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
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;
|
|
|
|
IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
|
|
|
|
totalBytesRead.QuadPart += bytesRead;
|
|
|
|
IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
|
|
|
|
totalBytesWritten.QuadPart += bytesWritten;
|
|
|
|
/*
|
|
* Check that read & write operations were successful
|
|
*/
|
|
if (bytesRead != bytesWritten)
|
|
{
|
|
hr = STG_E_MEDIUMFULL;
|
|
WARN("medium full\n");
|
|
break;
|
|
}
|
|
|
|
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 contained in structured storages, this method
|
|
* does nothing. This is what the documentation tells us.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
static HRESULT WINAPI StgStreamImpl_Commit(
|
|
IStream* iface,
|
|
DWORD grfCommitFlags) /* [in] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
|
|
if (!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
/***
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* For streams contained in structured storages, this method
|
|
* does nothing. This is what the documentation tells us.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
static HRESULT WINAPI StgStreamImpl_Revert(
|
|
IStream* iface)
|
|
{
|
|
return S_OK;
|
|
}
|
|
|
|
static HRESULT WINAPI StgStreamImpl_LockRegion(
|
|
IStream* iface,
|
|
ULARGE_INTEGER libOffset, /* [in] */
|
|
ULARGE_INTEGER cb, /* [in] */
|
|
DWORD dwLockType) /* [in] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
|
|
if (!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
FIXME("not implemented!\n");
|
|
return E_NOTIMPL;
|
|
}
|
|
|
|
static HRESULT WINAPI StgStreamImpl_UnlockRegion(
|
|
IStream* iface,
|
|
ULARGE_INTEGER libOffset, /* [in] */
|
|
ULARGE_INTEGER cb, /* [in] */
|
|
DWORD dwLockType) /* [in] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
|
|
if (!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
FIXME("not implemented!\n");
|
|
return E_NOTIMPL;
|
|
}
|
|
|
|
/***
|
|
* 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 StgStreamImpl_Stat(
|
|
IStream* iface,
|
|
STATSTG* pstatstg, /* [out] */
|
|
DWORD grfStatFlag) /* [in] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
|
|
DirEntry currentEntry;
|
|
BOOL readSuccessful;
|
|
|
|
TRACE("%p %p %d\n", This, pstatstg, grfStatFlag);
|
|
|
|
/*
|
|
* if stream has no parent, return STG_E_REVERTED
|
|
*/
|
|
|
|
if (!This->parentStorage)
|
|
{
|
|
WARN("storage reverted\n");
|
|
return STG_E_REVERTED;
|
|
}
|
|
|
|
/*
|
|
* Read the information from the directory entry.
|
|
*/
|
|
readSuccessful = StorageImpl_ReadDirEntry(This->parentStorage->ancestorStorage,
|
|
This->dirEntry,
|
|
¤tEntry);
|
|
|
|
if (readSuccessful)
|
|
{
|
|
StorageImpl *root = This->parentStorage->ancestorStorage;
|
|
|
|
StorageUtl_CopyDirEntryToSTATSTG(pstatstg,
|
|
¤tEntry,
|
|
grfStatFlag);
|
|
|
|
pstatstg->grfMode = This->grfMode;
|
|
|
|
/* In simple create mode cbSize is the current pos */
|
|
if((root->base.openFlags & STGM_SIMPLE) && root->create)
|
|
pstatstg->cbSize = This->currentPosition;
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
WARN("failed to read entry\n");
|
|
return E_FAIL;
|
|
}
|
|
|
|
/***
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* This method returns a clone of the interface that allows for
|
|
* another seek pointer
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*
|
|
* I am not totally sure what I am doing here but I presume that this
|
|
* should be basically as simple as creating a new stream with the same
|
|
* parent etc and positioning its seek cursor.
|
|
*/
|
|
static HRESULT WINAPI StgStreamImpl_Clone(
|
|
IStream* iface,
|
|
IStream** ppstm) /* [out] */
|
|
{
|
|
StgStreamImpl* const This=(StgStreamImpl*)iface;
|
|
HRESULT hres;
|
|
StgStreamImpl* new_stream;
|
|
LARGE_INTEGER seek_pos;
|
|
|
|
TRACE("%p %p\n", This, ppstm);
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
|
|
if (!This->parentStorage)
|
|
return STG_E_REVERTED;
|
|
|
|
if ( ppstm == 0 )
|
|
return STG_E_INVALIDPOINTER;
|
|
|
|
new_stream = StgStreamImpl_Construct (This->parentStorage, This->grfMode, This->dirEntry);
|
|
|
|
if (!new_stream)
|
|
return STG_E_INSUFFICIENTMEMORY; /* Currently the only reason for new_stream=0 */
|
|
|
|
*ppstm = (IStream*) new_stream;
|
|
IStream_AddRef(*ppstm);
|
|
|
|
seek_pos.QuadPart = This->currentPosition.QuadPart;
|
|
|
|
hres=StgStreamImpl_Seek (*ppstm, seek_pos, STREAM_SEEK_SET, NULL);
|
|
|
|
assert (SUCCEEDED(hres));
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
/*
|
|
* Virtual function table for the StgStreamImpl class.
|
|
*/
|
|
static const IStreamVtbl StgStreamImpl_Vtbl =
|
|
{
|
|
StgStreamImpl_QueryInterface,
|
|
StgStreamImpl_AddRef,
|
|
StgStreamImpl_Release,
|
|
StgStreamImpl_Read,
|
|
StgStreamImpl_Write,
|
|
StgStreamImpl_Seek,
|
|
StgStreamImpl_SetSize,
|
|
StgStreamImpl_CopyTo,
|
|
StgStreamImpl_Commit,
|
|
StgStreamImpl_Revert,
|
|
StgStreamImpl_LockRegion,
|
|
StgStreamImpl_UnlockRegion,
|
|
StgStreamImpl_Stat,
|
|
StgStreamImpl_Clone
|
|
};
|
|
|
|
/******************************************************************************
|
|
** StgStreamImpl implementation
|
|
*/
|
|
|
|
/***
|
|
* This is the constructor for the StgStreamImpl class.
|
|
*
|
|
* Params:
|
|
* parentStorage - Pointer to the storage that contains the stream to open
|
|
* dirEntry - Index of the directory entry that points to this stream.
|
|
*/
|
|
StgStreamImpl* StgStreamImpl_Construct(
|
|
StorageBaseImpl* parentStorage,
|
|
DWORD grfMode,
|
|
ULONG dirEntry)
|
|
{
|
|
StgStreamImpl* newStream;
|
|
|
|
newStream = HeapAlloc(GetProcessHeap(), 0, sizeof(StgStreamImpl));
|
|
|
|
if (newStream!=0)
|
|
{
|
|
/*
|
|
* Set-up the virtual function table and reference count.
|
|
*/
|
|
newStream->lpVtbl = &StgStreamImpl_Vtbl;
|
|
newStream->ref = 0;
|
|
|
|
newStream->parentStorage = parentStorage;
|
|
|
|
/*
|
|
* We want to nail-down the reference to the storage in case the
|
|
* stream out-lives the storage in the client application.
|
|
*
|
|
* -- IStorage_AddRef((IStorage*)newStream->parentStorage);
|
|
*
|
|
* No, don't do this. Some apps call IStorage_Release without
|
|
* calling IStream_Release first. If we grab a reference the
|
|
* file is not closed, and the app fails when it tries to
|
|
* reopen the file (Easy-PC, for example)
|
|
*/
|
|
|
|
newStream->grfMode = grfMode;
|
|
newStream->dirEntry = dirEntry;
|
|
|
|
/*
|
|
* Start the stream at the beginning.
|
|
*/
|
|
newStream->currentPosition.u.HighPart = 0;
|
|
newStream->currentPosition.u.LowPart = 0;
|
|
|
|
/*
|
|
* Initialize the rest of the data.
|
|
*/
|
|
newStream->streamSize.u.HighPart = 0;
|
|
newStream->streamSize.u.LowPart = 0;
|
|
newStream->bigBlockChain = 0;
|
|
newStream->smallBlockChain = 0;
|
|
|
|
/*
|
|
* Read the size from the directory entry and determine if the blocks forming
|
|
* this stream are large or small.
|
|
*/
|
|
StgStreamImpl_OpenBlockChain(newStream);
|
|
|
|
/* add us to the storage's list of active streams */
|
|
StorageBaseImpl_AddStream(parentStorage, newStream);
|
|
}
|
|
|
|
return newStream;
|
|
}
|