712 lines
17 KiB
C
712 lines
17 KiB
C
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/*
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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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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "windows.h"
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#include "winerror.h"
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#include "ole.h"
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#include "ole2.h"
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#include "compobj.h"
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#include "interfaces.h"
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#include "storage32.h"
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/*
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* Virtual function table for the StgStreamImpl class.
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*/
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static ICOM_VTABLE(IStream32) StgStreamImpl_Vtbl =
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{
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{
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{
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VTABLE_FUNC(StgStreamImpl_QueryInterface),
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VTABLE_FUNC(StgStreamImpl_AddRef),
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VTABLE_FUNC(StgStreamImpl_Release)
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},
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VTABLE_FUNC(StgStreamImpl_Read),
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VTABLE_FUNC(StgStreamImpl_Write)
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},
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VTABLE_FUNC(StgStreamImpl_Seek),
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VTABLE_FUNC(StgStreamImpl_SetSize),
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VTABLE_FUNC(StgStreamImpl_CopyTo),
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VTABLE_FUNC(StgStreamImpl_Commit),
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VTABLE_FUNC(StgStreamImpl_Revert),
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VTABLE_FUNC(StgStreamImpl_LockRegion),
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VTABLE_FUNC(StgStreamImpl_UnlockRegion),
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VTABLE_FUNC(StgStreamImpl_Stat),
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VTABLE_FUNC(StgStreamImpl_Clone)
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};
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/******************************************************************************
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** StgStreamImpl implementation
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*/
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/***
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* This is the constructor for the StgStreamImpl class.
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*
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* Params:
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* parentStorage - Pointer to the storage that contains the stream to open
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* ownerProperty - Index of the property that points to this stream.
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*/
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StgStreamImpl* StgStreamImpl_Construct(
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Storage32BaseImpl* parentStorage,
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ULONG ownerProperty)
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{
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StgStreamImpl* newStream;
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newStream = HeapAlloc(GetProcessHeap(), 0, sizeof(StgStreamImpl));
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if (newStream!=0)
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{
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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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newStream->lpvtbl = &StgStreamImpl_Vtbl;
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newStream->ref = 0;
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/*
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* We want to nail-down the reference to the storage in case the
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* stream out-lives the storage in the client application.
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*/
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newStream->parentStorage = parentStorage;
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IStorage32_AddRef(newStream->parentStorage);
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newStream->ownerProperty = ownerProperty;
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/*
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* Start the stream at the begining.
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*/
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newStream->currentPosition.HighPart = 0;
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newStream->currentPosition.LowPart = 0;
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/*
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* Initialize the rest of the data.
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*/
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newStream->streamSize.HighPart = 0;
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newStream->streamSize.LowPart = 0;
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newStream->bigBlockChain = 0;
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newStream->smallBlockChain = 0;
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/*
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* Read the size from the property and determine if the blocks forming
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* this stream are large or small.
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*/
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StgStreamImpl_OpenBlockChain(newStream);
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}
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return newStream;
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}
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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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void StgStreamImpl_Destroy(StgStreamImpl* This)
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{
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/*
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* Release the reference we are holding on the parent storage.
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*/
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IStorage32_Release(This->parentStorage);
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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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HRESULT WINAPI StgStreamImpl_QueryInterface(
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StgStreamImpl* This,
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REFIID riid, /* [in] */
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void** ppvObject) /* [iid_is][out] */
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{
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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)) == 0)
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{
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*ppvObject = (IStream32*)This;
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}
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else if (memcmp(&IID_IStorage, riid, sizeof(IID_IStream)) == 0)
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{
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*ppvObject = (IStream32*)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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StgStreamImpl_AddRef(This);
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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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ULONG WINAPI StgStreamImpl_AddRef(
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StgStreamImpl* This)
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{
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This->ref++;
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return 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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ULONG WINAPI StgStreamImpl_Release(
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StgStreamImpl* This)
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{
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ULONG newRef;
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This->ref--;
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newRef = 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 (newRef==0)
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{
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StgStreamImpl_Destroy(This);
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}
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return newRef;
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}
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/***
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* This method will open the block chain pointed by the property
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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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void StgStreamImpl_OpenBlockChain(
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StgStreamImpl* This)
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{
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StgProperty curProperty;
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BOOL32 readSucessful;
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/*
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* Make sure no old object is staying behind.
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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 property.
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*/
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readSucessful = Storage32Impl_ReadProperty(This->parentStorage->ancestorStorage,
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This->ownerProperty,
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&curProperty);
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if (readSucessful)
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{
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This->streamSize = curProperty.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.HighPart == 0);
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if(curProperty.startingBlock == BLOCK_END_OF_CHAIN)
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{
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assert( (This->streamSize.HighPart == 0) && (This->streamSize.LowPart == 0) );
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}
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else
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{
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if ( (This->streamSize.HighPart == 0) &&
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(This->streamSize.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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This->ownerProperty);
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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->ownerProperty);
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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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* If 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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HRESULT WINAPI StgStreamImpl_Read(
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StgStreamImpl* This,
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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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ULONG bytesReadBuffer;
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ULONG bytesToReadFromBuffer;
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/*
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* If the caller is not interested in the nubmer 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.LowPart - This->currentPosition.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 read the block chains.
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*/
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if (This->smallBlockChain!=0)
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{
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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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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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assert(FALSE);
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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.LowPart += *pcbRead;
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/*
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* The function returns S_OK if the buffer was filled completely
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* it returns S_FALSE if the end of the stream is reached before the
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* buffer is filled
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*/
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if(*pcbRead == cb)
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return S_OK;
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return S_FALSE;
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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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HRESULT WINAPI StgStreamImpl_Write(
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StgStreamImpl* This,
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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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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.HighPart = 0;
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newSize.LowPart = This->currentPosition.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.LowPart > This->streamSize.LowPart)
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{
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/* grow stream */
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StgStreamImpl_SetSize(This, newSize);
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}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
if (This->smallBlockChain!=0)
|
||
|
|
{
|
||
|
|
SmallBlockChainStream_WriteAt(This->smallBlockChain,
|
||
|
|
This->currentPosition,
|
||
|
|
cb,
|
||
|
|
pv,
|
||
|
|
pcbWritten);
|
||
|
|
|
||
|
|
}
|
||
|
|
else if (This->bigBlockChain!=0)
|
||
|
|
{
|
||
|
|
BlockChainStream_WriteAt(This->bigBlockChain,
|
||
|
|
This->currentPosition,
|
||
|
|
cb,
|
||
|
|
pv,
|
||
|
|
pcbWritten);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
assert(FALSE);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Advance the position pointer for the number of positions written.
|
||
|
|
*/
|
||
|
|
This->currentPosition.LowPart += *pcbWritten;
|
||
|
|
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/***
|
||
|
|
* This method is part of the IStream interface.
|
||
|
|
*
|
||
|
|
* It will move the current stream pointer according to the parameters
|
||
|
|
* given.
|
||
|
|
*
|
||
|
|
* See the documentation of IStream for more info.
|
||
|
|
*/
|
||
|
|
HRESULT WINAPI StgStreamImpl_Seek(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
LARGE_INTEGER dlibMove, /* [in] */
|
||
|
|
DWORD dwOrigin, /* [in] */
|
||
|
|
ULARGE_INTEGER* plibNewPosition) /* [out] */
|
||
|
|
{
|
||
|
|
ULARGE_INTEGER newPosition;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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->HighPart = 0;
|
||
|
|
plibNewPosition->LowPart = 0;
|
||
|
|
break;
|
||
|
|
case STREAM_SEEK_CUR:
|
||
|
|
*plibNewPosition = This->currentPosition;
|
||
|
|
break;
|
||
|
|
case STREAM_SEEK_END:
|
||
|
|
*plibNewPosition = This->streamSize;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return STG_E_INVALIDFUNCTION;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We don't support files with offsets of 64 bits.
|
||
|
|
*/
|
||
|
|
assert(dlibMove.HighPart == 0);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Check if we end-up before the beginning of the file. That should trigger an
|
||
|
|
* error.
|
||
|
|
*/
|
||
|
|
if ( (dlibMove.LowPart<0) && (plibNewPosition->LowPart < (ULONG)(-dlibMove.LowPart)) )
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* I don't know what error to send there.
|
||
|
|
*/
|
||
|
|
return E_FAIL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Move the actual file pointer
|
||
|
|
* If the file pointer ends-up after the end of the stream, the next Write operation will
|
||
|
|
* make the file larger. This is how it is documented.
|
||
|
|
*/
|
||
|
|
plibNewPosition->LowPart += dlibMove.LowPart;
|
||
|
|
This->currentPosition = *plibNewPosition;
|
||
|
|
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/***
|
||
|
|
* This method is part of the IStream interface.
|
||
|
|
*
|
||
|
|
* It will change the size of a stream.
|
||
|
|
*
|
||
|
|
* TODO: Switch from small blocks to big blocks and vice versa.
|
||
|
|
*
|
||
|
|
* See the documentation of IStream for more info.
|
||
|
|
*/
|
||
|
|
HRESULT WINAPI StgStreamImpl_SetSize(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
ULARGE_INTEGER libNewSize) /* [in] */
|
||
|
|
{
|
||
|
|
StgProperty curProperty;
|
||
|
|
BOOL32 Success;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* As documented.
|
||
|
|
*/
|
||
|
|
if (libNewSize.HighPart != 0)
|
||
|
|
return STG_E_INVALIDFUNCTION;
|
||
|
|
|
||
|
|
if (This->streamSize.LowPart == libNewSize.LowPart)
|
||
|
|
return S_OK;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This will happen if we're creating a stream
|
||
|
|
*/
|
||
|
|
if ((This->smallBlockChain == 0) && (This->bigBlockChain == 0))
|
||
|
|
{
|
||
|
|
if (libNewSize.LowPart < LIMIT_TO_USE_SMALL_BLOCK)
|
||
|
|
{
|
||
|
|
This->smallBlockChain = SmallBlockChainStream_Construct(
|
||
|
|
This->parentStorage->ancestorStorage,
|
||
|
|
This->ownerProperty);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
This->bigBlockChain = BlockChainStream_Construct(
|
||
|
|
This->parentStorage->ancestorStorage,
|
||
|
|
NULL,
|
||
|
|
This->ownerProperty);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read this stream's property to see if it's small blocks or big blocks
|
||
|
|
*/
|
||
|
|
Success = Storage32Impl_ReadProperty(This->parentStorage->ancestorStorage,
|
||
|
|
This->ownerProperty,
|
||
|
|
&curProperty);
|
||
|
|
/*
|
||
|
|
* TODO
|
||
|
|
* determine if we have to switch from small to big blocks or vice versa
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (This->smallBlockChain!=0)
|
||
|
|
{
|
||
|
|
Success = SmallBlockChainStream_SetSize(This->smallBlockChain, libNewSize);
|
||
|
|
curProperty.blockType = SMALL_BLOCK_TYPE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
Success = BlockChainStream_SetSize(This->bigBlockChain, libNewSize);
|
||
|
|
curProperty.blockType = BIG_BLOCK_TYPE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Write to the property the new information about this stream
|
||
|
|
*/
|
||
|
|
Success = Storage32Impl_ReadProperty(This->parentStorage->ancestorStorage,
|
||
|
|
This->ownerProperty,
|
||
|
|
&curProperty);
|
||
|
|
|
||
|
|
curProperty.size.HighPart = libNewSize.HighPart;
|
||
|
|
curProperty.size.LowPart = libNewSize.LowPart;
|
||
|
|
|
||
|
|
if (Success)
|
||
|
|
{
|
||
|
|
Storage32Impl_WriteProperty(This->parentStorage->ancestorStorage,
|
||
|
|
This->ownerProperty,
|
||
|
|
&curProperty);
|
||
|
|
}
|
||
|
|
|
||
|
|
This->streamSize = libNewSize;
|
||
|
|
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT WINAPI StgStreamImpl_CopyTo(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
IStream32* pstm, /* [unique][in] */
|
||
|
|
ULARGE_INTEGER cb, /* [in] */
|
||
|
|
ULARGE_INTEGER* pcbRead, /* [out] */
|
||
|
|
ULARGE_INTEGER* pcbWritten) /* [out] */
|
||
|
|
{
|
||
|
|
return E_NOTIMPL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/***
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
HRESULT WINAPI StgStreamImpl_Commit(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
DWORD grfCommitFlags) /* [in] */
|
||
|
|
{
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
HRESULT WINAPI StgStreamImpl_Revert(
|
||
|
|
StgStreamImpl* This)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT WINAPI StgStreamImpl_LockRegion(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
ULARGE_INTEGER libOffset, /* [in] */
|
||
|
|
ULARGE_INTEGER cb, /* [in] */
|
||
|
|
DWORD dwLockType) /* [in] */
|
||
|
|
{
|
||
|
|
return E_NOTIMPL;
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT WINAPI StgStreamImpl_UnlockRegion(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
ULARGE_INTEGER libOffset, /* [in] */
|
||
|
|
ULARGE_INTEGER cb, /* [in] */
|
||
|
|
DWORD dwLockType) /* [in] */
|
||
|
|
{
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
HRESULT WINAPI StgStreamImpl_Stat(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
STATSTG* pstatstg, /* [out] */
|
||
|
|
DWORD grfStatFlag) /* [in] */
|
||
|
|
{
|
||
|
|
StgProperty curProperty;
|
||
|
|
BOOL32 readSucessful;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read the information from the property.
|
||
|
|
*/
|
||
|
|
readSucessful = Storage32Impl_ReadProperty(This->parentStorage->ancestorStorage,
|
||
|
|
This->ownerProperty,
|
||
|
|
&curProperty);
|
||
|
|
|
||
|
|
if (readSucessful)
|
||
|
|
{
|
||
|
|
StorageUtl_CopyPropertyToSTATSTG(pstatstg,
|
||
|
|
&curProperty,
|
||
|
|
grfStatFlag);
|
||
|
|
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
return E_FAIL;
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT WINAPI StgStreamImpl_Clone(
|
||
|
|
StgStreamImpl* This,
|
||
|
|
IStream32** ppstm) /* [out] */
|
||
|
|
{
|
||
|
|
return E_NOTIMPL;
|
||
|
|
}
|