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829 lines
20 KiB
C
829 lines
20 KiB
C
/*
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* HGLOBAL 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 suported by an HGLOBAL pointer.
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*
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* Copyright 1999 Francis Beaudet
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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 "winbase.h"
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#include "winerror.h"
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#include "debug.h"
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#include "objbase.h"
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DEFAULT_DEBUG_CHANNEL(storage)
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/****************************************************************************
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* HGLOBALStreamImpl definition.
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*
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* This class imlements the IStream inteface and represents a stream
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* supported by an HGLOBAL pointer.
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*/
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struct HGLOBALStreamImpl
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{
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ICOM_VTABLE(IStream) *lpvtbl; /* Needs to be the first item in the stuct
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* since we want to cast this in a IStream pointer */
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/*
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* Reference count
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*/
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ULONG ref;
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/*
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* Support for the stream
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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 stream
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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 stream
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*/
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ULARGE_INTEGER streamSize;
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/*
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* This is the current position of the cursor in the stream
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*/
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ULARGE_INTEGER currentPosition;
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};
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typedef struct HGLOBALStreamImpl HGLOBALStreamImpl;
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/*
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* Method definition for the StgStreamImpl class.
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*/
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HGLOBALStreamImpl* HGLOBALStreamImpl_Construct(
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HGLOBAL hGlobal,
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BOOL fDeleteOnRelease);
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void HGLOBALStreamImpl_Destroy(
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HGLOBALStreamImpl* This);
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void HGLOBALStreamImpl_OpenBlockChain(
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HGLOBALStreamImpl* This);
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HRESULT WINAPI HGLOBALStreamImpl_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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ULONG WINAPI HGLOBALStreamImpl_AddRef(
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IStream* iface);
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ULONG WINAPI HGLOBALStreamImpl_Release(
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IStream* iface);
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HRESULT WINAPI HGLOBALStreamImpl_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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HRESULT WINAPI HGLOBALStreamImpl_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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HRESULT WINAPI HGLOBALStreamImpl_Seek(
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IStream* iface,
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LARGE_INTEGER dlibMove, /* [in] */
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DWORD dwOrigin, /* [in] */
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ULARGE_INTEGER* plibNewPosition); /* [out] */
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HRESULT WINAPI HGLOBALStreamImpl_SetSize(
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IStream* iface,
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ULARGE_INTEGER libNewSize); /* [in] */
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HRESULT WINAPI HGLOBALStreamImpl_CopyTo(
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IStream* iface,
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IStream* pstm, /* [unique][in] */
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ULARGE_INTEGER cb, /* [in] */
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ULARGE_INTEGER* pcbRead, /* [out] */
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ULARGE_INTEGER* pcbWritten); /* [out] */
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HRESULT WINAPI HGLOBALStreamImpl_Commit(
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IStream* iface,
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DWORD grfCommitFlags); /* [in] */
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HRESULT WINAPI HGLOBALStreamImpl_Revert(
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IStream* iface);
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HRESULT WINAPI HGLOBALStreamImpl_LockRegion(
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IStream* 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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HRESULT WINAPI HGLOBALStreamImpl_UnlockRegion(
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IStream* 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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HRESULT WINAPI HGLOBALStreamImpl_Stat(
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IStream* iface,
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STATSTG* pstatstg, /* [out] */
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DWORD grfStatFlag); /* [in] */
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HRESULT WINAPI HGLOBALStreamImpl_Clone(
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IStream* iface,
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IStream** ppstm); /* [out] */
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/*
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* Virtual function table for the HGLOBALStreamImpl class.
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*/
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static ICOM_VTABLE(IStream) HGLOBALStreamImpl_Vtbl =
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{
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ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
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HGLOBALStreamImpl_QueryInterface,
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HGLOBALStreamImpl_AddRef,
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HGLOBALStreamImpl_Release,
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HGLOBALStreamImpl_Read,
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HGLOBALStreamImpl_Write,
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HGLOBALStreamImpl_Seek,
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HGLOBALStreamImpl_SetSize,
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HGLOBALStreamImpl_CopyTo,
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HGLOBALStreamImpl_Commit,
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HGLOBALStreamImpl_Revert,
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HGLOBALStreamImpl_LockRegion,
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HGLOBALStreamImpl_UnlockRegion,
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HGLOBALStreamImpl_Stat,
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HGLOBALStreamImpl_Clone
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};
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/***********************************************************************
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* CreateStreamOnHGlobal [OLE32.61]
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*/
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HRESULT WINAPI CreateStreamOnHGlobal(
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HGLOBAL hGlobal,
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BOOL fDeleteOnRelease,
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LPSTREAM* ppstm)
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{
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HGLOBALStreamImpl* newStream;
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newStream = HGLOBALStreamImpl_Construct(hGlobal,
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fDeleteOnRelease);
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if (newStream!=NULL)
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{
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return IUnknown_QueryInterface((IUnknown*)newStream,
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&IID_IStream,
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(void**)ppstm);
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}
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return E_OUTOFMEMORY;
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}
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/***********************************************************************
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* GetHGlobalFromStream [OLE32.71]
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*/
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HRESULT WINAPI GetHGlobalFromStream(IStream* pstm, HGLOBAL* phglobal)
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{
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HGLOBALStreamImpl* pStream;
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if (pstm == NULL)
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return E_INVALIDARG;
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pStream = (HGLOBALStreamImpl*) pstm;
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/*
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* Verify that the stream object was created with CreateStreamOnHGlobal.
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*/
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if (pStream->lpvtbl == &HGLOBALStreamImpl_Vtbl)
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*phglobal = pStream->supportHandle;
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else
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{
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*phglobal = 0;
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return E_INVALIDARG;
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}
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return S_OK;
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}
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/******************************************************************************
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** HGLOBALStreamImpl implementation
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*/
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/***
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* This is the constructor for the HGLOBALStreamImpl class.
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*
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* Params:
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* hGlobal - Handle that will support the stream. can be NULL.
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* fDeleteOnRelease - Flag set to TRUE if the HGLOBAL will be released
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* when the IStream object is destroyed.
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*/
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HGLOBALStreamImpl* HGLOBALStreamImpl_Construct(
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HGLOBAL hGlobal,
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BOOL fDeleteOnRelease)
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{
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HGLOBALStreamImpl* newStream;
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newStream = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALStreamImpl));
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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 = &HGLOBALStreamImpl_Vtbl;
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newStream->ref = 0;
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/*
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* Initialize the support.
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*/
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newStream->supportHandle = hGlobal;
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newStream->deleteOnRelease = fDeleteOnRelease;
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/*
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* This method will allocate a handle if one is not supplied.
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*/
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if (newStream->supportHandle == NULL)
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{
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newStream->supportHandle = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD, 0);
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}
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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 size of the stream to the size of the handle.
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*/
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newStream->streamSize.HighPart = 0;
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newStream->streamSize.LowPart = GlobalSize(newStream->supportHandle);
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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 HGLOBALStreamImpl class.
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*
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* This method will clean-up all the resources used-up by the given HGLOBALStreamImpl
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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 HGLOBALStreamImpl_Destroy(HGLOBALStreamImpl* This)
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{
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TRACE(storage, "(%p)\n", This);
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/*
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* Release the HGlobal if the constructor asked for that.
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*/
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if (This->deleteOnRelease)
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{
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GlobalFree(This->supportHandle);
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This->supportHandle=0;
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}
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/*
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* Finally, free the memory used-up by the class.
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*/
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HeapFree(GetProcessHeap(), 0, This);
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}
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/***
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* This implements the IUnknown method QueryInterface for this
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* class
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*/
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HRESULT WINAPI HGLOBALStreamImpl_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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HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)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 (memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) == 0)
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{
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*ppvObject = (IStream*)This;
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}
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else if (memcmp(&IID_IStream, riid, sizeof(IID_IStream)) == 0)
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{
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*ppvObject = (IStream*)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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HGLOBALStreamImpl_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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ULONG WINAPI HGLOBALStreamImpl_AddRef(
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IStream* iface)
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{
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HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
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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 HGLOBALStreamImpl_Release(
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IStream* iface)
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{
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HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
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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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HGLOBALStreamImpl_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 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 HGLOBALStreamImpl_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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HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
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void* supportBuffer;
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ULONG bytesReadBuffer;
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ULONG bytesToReadFromBuffer;
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TRACE(storage, "(%p, %p, %ld, %p)\n", iface,
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pv, cb, pcbRead);
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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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* 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, (char *) supportBuffer+This->currentPosition.LowPart, bytesToReadFromBuffer);
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/*
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* Move the current position to the new position
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*/
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This->currentPosition.LowPart+=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 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 HGLOBALStreamImpl_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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HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
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void* supportBuffer;
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ULARGE_INTEGER newSize;
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ULONG bytesWritten = 0;
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TRACE(storage, "(%p, %p, %ld, %p)\n", iface,
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pv, cb, pcbWritten);
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/*
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* If the caller is not interested in the number of bytes written,
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* we use another buffer to avoid "if" statements in the code.
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*/
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if (pcbWritten == 0)
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pcbWritten = &bytesWritten;
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if (cb == 0)
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{
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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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IStream_SetSize(iface, newSize);
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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+This->currentPosition.LowPart, pv, cb);
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/*
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* Move the current position to the new position
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*/
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This->currentPosition.LowPart+=cb;
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/*
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* Return the number of bytes read.
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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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/***
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* This method is part of the IStream interface.
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*
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* It will move the current stream pointer according to the parameters
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* given.
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*
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* See the documentation of IStream for more info.
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*/
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HRESULT WINAPI HGLOBALStreamImpl_Seek(
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IStream* iface,
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LARGE_INTEGER dlibMove, /* [in] */
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DWORD dwOrigin, /* [in] */
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ULARGE_INTEGER* plibNewPosition) /* [out] */
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{
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HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
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ULARGE_INTEGER newPosition;
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TRACE(storage, "(%p, %ld, %ld, %p)\n", iface,
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dlibMove.LowPart, dwOrigin, plibNewPosition);
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/*
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* The caller is allowed to pass in NULL as the new position return value.
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* If it happens, we assign it to a dynamic variable to avoid special cases
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* in the code below.
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*/
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if (plibNewPosition == 0)
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{
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plibNewPosition = &newPosition;
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}
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/*
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* The file pointer is moved depending on the given "function"
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* parameter.
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*/
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switch (dwOrigin)
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{
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case STREAM_SEEK_SET:
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plibNewPosition->HighPart = 0;
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plibNewPosition->LowPart = 0;
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break;
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case STREAM_SEEK_CUR:
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*plibNewPosition = This->currentPosition;
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break;
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case STREAM_SEEK_END:
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*plibNewPosition = This->streamSize;
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break;
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default:
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return STG_E_INVALIDFUNCTION;
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}
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|
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/*
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* We don't support files with offsets of 64 bits.
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|
*/
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assert(dlibMove.HighPart == 0);
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|
|
|
/*
|
|
* 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 HGLOBALStreamImpl_SetSize(
|
|
IStream* iface,
|
|
ULARGE_INTEGER libNewSize) /* [in] */
|
|
{
|
|
HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
|
|
|
|
TRACE(storage, "(%p, %ld)\n", iface, libNewSize.LowPart);
|
|
|
|
/*
|
|
* As documented.
|
|
*/
|
|
if (libNewSize.HighPart != 0)
|
|
return STG_E_INVALIDFUNCTION;
|
|
|
|
if (This->streamSize.LowPart == libNewSize.LowPart)
|
|
return S_OK;
|
|
|
|
/*
|
|
* Re allocate the HGlobal to fit the new size of the stream.
|
|
*/
|
|
This->supportHandle = GlobalReAlloc(This->supportHandle,
|
|
libNewSize.LowPart,
|
|
0);
|
|
|
|
This->streamSize.LowPart = libNewSize.LowPart;
|
|
|
|
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.
|
|
*/
|
|
HRESULT WINAPI HGLOBALStreamImpl_CopyTo(
|
|
IStream* iface,
|
|
IStream* pstm, /* [unique][in] */
|
|
ULARGE_INTEGER cb, /* [in] */
|
|
ULARGE_INTEGER* pcbRead, /* [out] */
|
|
ULARGE_INTEGER* pcbWritten) /* [out] */
|
|
{
|
|
HRESULT hr = S_OK;
|
|
BYTE tmpBuffer[128];
|
|
ULONG bytesRead, bytesWritten, copySize;
|
|
ULARGE_INTEGER totalBytesRead;
|
|
ULARGE_INTEGER totalBytesWritten;
|
|
|
|
TRACE(storage, "(%p, %p, %ld, %p, %p)\n", iface, pstm,
|
|
cb.LowPart, pcbRead, pcbWritten);
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
if ( pstm == 0 )
|
|
return STG_E_INVALIDPOINTER;
|
|
|
|
totalBytesRead.LowPart = totalBytesRead.HighPart = 0;
|
|
totalBytesWritten.LowPart = totalBytesWritten.HighPart = 0;
|
|
|
|
/*
|
|
* use stack to store data temporarly
|
|
* there is surely more performant way of doing it, for now this basic
|
|
* implementation will do the job
|
|
*/
|
|
while ( cb.LowPart > 0 )
|
|
{
|
|
if ( cb.LowPart >= 128 )
|
|
copySize = 128;
|
|
else
|
|
copySize = cb.LowPart;
|
|
|
|
IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
|
|
|
|
totalBytesRead.LowPart += bytesRead;
|
|
|
|
IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
|
|
|
|
totalBytesWritten.LowPart += bytesWritten;
|
|
|
|
/*
|
|
* Check that read & write operations were succesfull
|
|
*/
|
|
if (bytesRead != bytesWritten)
|
|
{
|
|
hr = STG_E_MEDIUMFULL;
|
|
break;
|
|
}
|
|
|
|
if (bytesRead!=copySize)
|
|
cb.LowPart = 0;
|
|
else
|
|
cb.LowPart -= bytesRead;
|
|
}
|
|
|
|
/*
|
|
* Update number of bytes read and written
|
|
*/
|
|
if (pcbRead)
|
|
{
|
|
pcbRead->LowPart = totalBytesRead.LowPart;
|
|
pcbRead->HighPart = totalBytesRead.HighPart;
|
|
}
|
|
|
|
if (pcbWritten)
|
|
{
|
|
pcbWritten->LowPart = totalBytesWritten.LowPart;
|
|
pcbWritten->HighPart = totalBytesWritten.HighPart;
|
|
}
|
|
return hr;
|
|
}
|
|
|
|
/***
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* For streams supported by HGLOBALS, this function does nothing.
|
|
* This is what the documentation tells us.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
HRESULT WINAPI HGLOBALStreamImpl_Commit(
|
|
IStream* iface,
|
|
DWORD grfCommitFlags) /* [in] */
|
|
{
|
|
return S_OK;
|
|
}
|
|
|
|
/***
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* For streams supported by HGLOBALS, this function does nothing.
|
|
* This is what the documentation tells us.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
HRESULT WINAPI HGLOBALStreamImpl_Revert(
|
|
IStream* iface)
|
|
{
|
|
return S_OK;
|
|
}
|
|
|
|
/***
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* For streams supported by HGLOBALS, this function does nothing.
|
|
* This is what the documentation tells us.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
HRESULT WINAPI HGLOBALStreamImpl_LockRegion(
|
|
IStream* iface,
|
|
ULARGE_INTEGER libOffset, /* [in] */
|
|
ULARGE_INTEGER cb, /* [in] */
|
|
DWORD dwLockType) /* [in] */
|
|
{
|
|
return S_OK;
|
|
}
|
|
|
|
/*
|
|
* This method is part of the IStream interface.
|
|
*
|
|
* For streams supported by HGLOBALS, this function does nothing.
|
|
* This is what the documentation tells us.
|
|
*
|
|
* See the documentation of IStream for more info.
|
|
*/
|
|
HRESULT WINAPI HGLOBALStreamImpl_UnlockRegion(
|
|
IStream* iface,
|
|
ULARGE_INTEGER libOffset, /* [in] */
|
|
ULARGE_INTEGER cb, /* [in] */
|
|
DWORD dwLockType) /* [in] */
|
|
{
|
|
return S_OK;
|
|
}
|
|
|
|
/***
|
|
* 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 HGLOBALStreamImpl_Stat(
|
|
IStream* iface,
|
|
STATSTG* pstatstg, /* [out] */
|
|
DWORD grfStatFlag) /* [in] */
|
|
{
|
|
HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
|
|
|
|
memset(pstatstg, 0, sizeof(STATSTG));
|
|
|
|
pstatstg->pwcsName = NULL;
|
|
pstatstg->type = STGTY_STREAM;
|
|
pstatstg->cbSize = This->streamSize;
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
HRESULT WINAPI HGLOBALStreamImpl_Clone(
|
|
IStream* iface,
|
|
IStream** ppstm) /* [out] */
|
|
{
|
|
FIXME(storage, "not implemented!\n");
|
|
return E_NOTIMPL;
|
|
}
|