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579 lines
15 KiB
C
579 lines
15 KiB
C
/******************************************************************************
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*
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* Global memory implementation of ILockBytes.
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*
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* Copyright 1999 Thuy Nguyen
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*
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*/
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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 "objbase.h"
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#include "debug.h"
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DEFAULT_DEBUG_CHANNEL(ole)
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/******************************************************************************
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* HGLOBALLockBytesImpl definition.
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*
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* This class imlements the ILockBytes inteface and represents a byte array
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* object supported by an HGLOBAL pointer.
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*/
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struct HGLOBALLockBytesImpl
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{
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/*
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* Needs to be the first item in the stuct
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* since we want to cast this in an ILockBytes pointer
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*/
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ICOM_VTABLE(ILockBytes) *lpvtbl;
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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 LockBytes object
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*/
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HGLOBAL supportHandle;
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/*
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* This flag is TRUE if the HGLOBAL is destroyed when the object
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* is finally released.
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*/
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BOOL deleteOnRelease;
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/*
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* Helper variable that contains the size of the byte array
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*/
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ULARGE_INTEGER byteArraySize;
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};
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typedef struct HGLOBALLockBytesImpl HGLOBALLockBytesImpl;
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/*
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* Method definition for the HGLOBALLockBytesImpl class.
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*/
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HGLOBALLockBytesImpl* HGLOBALLockBytesImpl_Construct(
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HGLOBAL hGlobal,
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BOOL fDeleteOnRelease);
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void HGLOBALLockBytesImpl_Destroy(HGLOBALLockBytesImpl* This);
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HRESULT WINAPI HGLOBALLockBytesImpl_QueryInterface(
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ILockBytes* iface,
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REFIID riid, /* [in] */
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void** ppvObject); /* [iid_is][out] */
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ULONG WINAPI HGLOBALLockBytesImpl_AddRef(
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ILockBytes* iface);
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ULONG WINAPI HGLOBALLockBytesImpl_Release(
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ILockBytes* iface);
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HRESULT WINAPI HGLOBALLockBytesImpl_ReadAt(
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ILockBytes* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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void* pv, /* [length_is][size_is][out] */
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ULONG cb, /* [in] */
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ULONG* pcbRead); /* [out] */
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HRESULT WINAPI HGLOBALLockBytesImpl_WriteAt(
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ILockBytes* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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const void* pv, /* [size_is][in] */
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ULONG cb, /* [in] */
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ULONG* pcbWritten); /* [out] */
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HRESULT WINAPI HGLOBALLockBytesImpl_Flush(
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ILockBytes* iface);
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HRESULT WINAPI HGLOBALLockBytesImpl_SetSize(
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ILockBytes* iface,
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ULARGE_INTEGER libNewSize); /* [in] */
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HRESULT WINAPI HGLOBALLockBytesImpl_LockRegion(
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ILockBytes* iface,
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ULARGE_INTEGER libOffset, /* [in] */
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ULARGE_INTEGER cb, /* [in] */
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DWORD dwLockType); /* [in] */
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HRESULT WINAPI HGLOBALLockBytesImpl_UnlockRegion(
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ILockBytes* iface,
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ULARGE_INTEGER libOffset, /* [in] */
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ULARGE_INTEGER cb, /* [in] */
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DWORD dwLockType); /* [in] */
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HRESULT WINAPI HGLOBALLockBytesImpl_Stat(
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ILockBytes* iface,
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STATSTG* pstatstg, /* [out] */
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DWORD grfStatFlag); /* [in] */
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/*
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* Virtual function table for the HGLOBALLockBytesImpl class.
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*/
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static ICOM_VTABLE(ILockBytes) HGLOBALLockBytesImpl_Vtbl =
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{
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HGLOBALLockBytesImpl_QueryInterface,
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HGLOBALLockBytesImpl_AddRef,
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HGLOBALLockBytesImpl_Release,
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HGLOBALLockBytesImpl_ReadAt,
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HGLOBALLockBytesImpl_WriteAt,
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HGLOBALLockBytesImpl_Flush,
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HGLOBALLockBytesImpl_SetSize,
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HGLOBALLockBytesImpl_LockRegion,
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HGLOBALLockBytesImpl_UnlockRegion,
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HGLOBALLockBytesImpl_Stat,
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};
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/******************************************************************************
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* CreateILockBytesOnHGlobal [OLE32.57]
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*/
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HRESULT WINAPI CreateILockBytesOnHGlobal(HGLOBAL hGlobal,
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BOOL fDeleteOnRelease,
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LPLOCKBYTES* ppLkbyt)
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{
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HGLOBALLockBytesImpl* newLockBytes;
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newLockBytes = HGLOBALLockBytesImpl_Construct(hGlobal, fDeleteOnRelease);
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if (newLockBytes != NULL)
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{
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return IUnknown_QueryInterface((IUnknown*)newLockBytes,
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&IID_ILockBytes,
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(void**)ppLkbyt);
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}
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return E_OUTOFMEMORY;
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}
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/******************************************************************************
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* GetHGlobalFromILockBytes [OLE32.70]
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*/
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HRESULT WINAPI GetHGlobalFromILockBytes(ILockBytes* plkbyt, HGLOBAL* phglobal)
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{
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HGLOBALLockBytesImpl* const pMemLockBytes = (HGLOBALLockBytesImpl*)plkbyt;
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if (pMemLockBytes->lpvtbl == &HGLOBALLockBytesImpl_Vtbl)
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phglobal = &pMemLockBytes->supportHandle;
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else
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phglobal = NULL;
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if (phglobal == NULL)
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return E_INVALIDARG;
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return S_OK;
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}
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/******************************************************************************
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*
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* HGLOBALLockBytesImpl implementation
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*
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*/
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/******************************************************************************
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* This is the constructor for the HGLOBALLockBytesImpl 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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HGLOBALLockBytesImpl* HGLOBALLockBytesImpl_Construct(HGLOBAL hGlobal,
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BOOL fDeleteOnRelease)
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{
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HGLOBALLockBytesImpl* newLockBytes;
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newLockBytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl));
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if (newLockBytes!=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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newLockBytes->lpvtbl = &HGLOBALLockBytesImpl_Vtbl;
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newLockBytes->ref = 0;
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/*
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* Initialize the support.
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*/
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newLockBytes->supportHandle = hGlobal;
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newLockBytes->deleteOnRelease = fDeleteOnRelease;
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/*
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* This method will allocate a handle if one is not supplied.
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*/
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if (newLockBytes->supportHandle == 0)
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{
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newLockBytes->supportHandle = GlobalAlloc(GMEM_MOVEABLE |
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GMEM_NODISCARD,
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0);
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}
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/*
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* Initialize the size of the array to the size of the handle.
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*/
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newLockBytes->byteArraySize.HighPart = 0;
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newLockBytes->byteArraySize.LowPart = GlobalSize(
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newLockBytes->supportHandle);
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}
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return newLockBytes;
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}
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/******************************************************************************
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* This is the destructor of the HGLOBALStreamImpl class.
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*
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* This method will clean-up all the resources used-up by the given
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* HGLOBALLockBytesImpl class. The pointer passed-in to this function will be
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* freed and will not be valid anymore.
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*/
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void HGLOBALLockBytesImpl_Destroy(HGLOBALLockBytesImpl* This)
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{
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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 HGLOBALLockBytesImpl_QueryInterface(
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ILockBytes* iface,
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REFIID riid, /* [in] */
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void** ppvObject) /* [iid_is][out] */
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{
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)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 = (ILockBytes*)This;
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}
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else if (memcmp(&IID_ILockBytes, riid, sizeof(IID_ILockBytes)) == 0)
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{
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*ppvObject = (ILockBytes*)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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HGLOBALLockBytesImpl_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 HGLOBALLockBytesImpl_AddRef(ILockBytes* iface)
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{
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)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 HGLOBALLockBytesImpl_Release(ILockBytes* iface)
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{
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)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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HGLOBALLockBytesImpl_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 ILockBytes interface.
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*
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* It reads a block of information from the byte array at the specified
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* offset.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT WINAPI HGLOBALLockBytesImpl_ReadAt(
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ILockBytes* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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void* pv, /* [length_is][size_is][out] */
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ULONG cb, /* [in] */
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ULONG* pcbRead) /* [out] */
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{
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
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void* supportBuffer;
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ULONG bytesReadBuffer = 0;
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ULONG bytesToReadFromBuffer;
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/*
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* If the caller is not interested in the number of bytes read,
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* we use another buffer to avoid "if" statements in the code.
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*/
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if (pcbRead == 0)
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pcbRead = &bytesReadBuffer;
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/*
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* Make sure the offset is valid.
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*/
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if (ulOffset.LowPart > This->byteArraySize.LowPart)
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return E_FAIL;
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/*
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* Using the known size of the array, calculate the number of bytes
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* to read.
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*/
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bytesToReadFromBuffer = MIN(This->byteArraySize.LowPart -
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ulOffset.LowPart, cb);
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/*
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* Lock the buffer in position and copy the data.
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*/
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supportBuffer = GlobalLock(This->supportHandle);
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memcpy(pv,
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supportBuffer + ulOffset.LowPart,
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bytesToReadFromBuffer);
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/*
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* Return the number of bytes read.
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*/
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*pcbRead = bytesToReadFromBuffer;
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/*
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* Cleanup
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*/
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GlobalUnlock(This->supportHandle);
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/*
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* The function returns S_OK if the specified number of bytes were read
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* or the end of the array was reached.
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* It returns STG_E_READFAULT if the number of bytes to read does not equal
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* the number of bytes actually read.
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*/
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if(*pcbRead == cb)
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return S_OK;
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return STG_E_READFAULT;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* It writes the specified bytes at the specified offset.
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* position. If the array is too small, it will be resized.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT WINAPI HGLOBALLockBytesImpl_WriteAt(
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ILockBytes* iface,
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ULARGE_INTEGER ulOffset, /* [in] */
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const void* pv, /* [size_is][in] */
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ULONG cb, /* [in] */
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ULONG* pcbWritten) /* [out] */
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{
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
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void* supportBuffer;
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ULARGE_INTEGER newSize;
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ULONG bytesWritten = 0;
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/*
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* If the caller is not interested in the number of bytes written,
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* we use another buffer to avoid "if" statements in the code.
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*/
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if (pcbWritten == 0)
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pcbWritten = &bytesWritten;
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if (cb == 0)
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{
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return S_OK;
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}
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else
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{
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newSize.HighPart = 0;
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newSize.LowPart = ulOffset.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->byteArraySize.LowPart)
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{
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/* grow stream */
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if (HGLOBALLockBytesImpl_SetSize(iface, newSize) == STG_E_MEDIUMFULL)
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return STG_E_MEDIUMFULL;
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}
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/*
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* Lock the buffer in position and copy the data.
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*/
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supportBuffer = GlobalLock(This->supportHandle);
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memcpy(supportBuffer + ulOffset.LowPart, pv, cb);
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/*
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* Return the number of bytes written.
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*/
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*pcbWritten = cb;
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/*
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* Cleanup
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*/
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GlobalUnlock(This->supportHandle);
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return S_OK;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT WINAPI HGLOBALLockBytesImpl_Flush(ILockBytes* iface)
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{
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return S_OK;
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}
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* It will change the size of the byte array.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT WINAPI HGLOBALLockBytesImpl_SetSize(
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ILockBytes* iface,
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ULARGE_INTEGER libNewSize) /* [in] */
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{
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
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/*
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* As documented.
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*/
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if (libNewSize.HighPart != 0)
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return STG_E_INVALIDFUNCTION;
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if (This->byteArraySize.LowPart == libNewSize.LowPart)
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return S_OK;
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/*
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* Re allocate the HGlobal to fit the new size of the stream.
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*/
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This->supportHandle = GlobalReAlloc(This->supportHandle,
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libNewSize.LowPart,
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0);
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if (This->supportHandle == 0)
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return STG_E_MEDIUMFULL;
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This->byteArraySize.LowPart = libNewSize.LowPart;
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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 ILockBytes interface.
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*
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* The global memory implementation of ILockBytes does not support locking.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT WINAPI HGLOBALLockBytesImpl_LockRegion(
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ILockBytes* iface,
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ULARGE_INTEGER libOffset, /* [in] */
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ULARGE_INTEGER cb, /* [in] */
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DWORD dwLockType) /* [in] */
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{
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return STG_E_INVALIDFUNCTION;
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}
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|
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* The global memory implementation of ILockBytes does not support locking.
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*
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* See the documentation of ILockBytes for more info.
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*/
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HRESULT WINAPI HGLOBALLockBytesImpl_UnlockRegion(
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ILockBytes* iface,
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ULARGE_INTEGER libOffset, /* [in] */
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ULARGE_INTEGER cb, /* [in] */
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DWORD dwLockType) /* [in] */
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{
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return STG_E_INVALIDFUNCTION;
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}
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|
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/******************************************************************************
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* This method is part of the ILockBytes interface.
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*
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* This method returns information about the current
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* byte array object.
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*
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* See the documentation of ILockBytes for more info.
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*/
|
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HRESULT WINAPI HGLOBALLockBytesImpl_Stat(
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ILockBytes* iface,
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STATSTG* pstatstg, /* [out] */
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DWORD grfStatFlag) /* [in] */
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{
|
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HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
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memset(pstatstg, 0, sizeof(STATSTG));
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pstatstg->pwcsName = NULL;
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pstatstg->type = STGTY_LOCKBYTES;
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pstatstg->cbSize = This->byteArraySize;
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return S_OK;
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}
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|