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676 lines
16 KiB
C
676 lines
16 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 supported by an HGLOBAL pointer.
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*
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* Copyright 1999 Francis Beaudet
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* Copyright 2016 Dmitry Timoshkov
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#define COBJMACROS
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#define NONAMELESSUNION
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#include "windef.h"
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#include "winbase.h"
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#include "winuser.h"
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#include "objbase.h"
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#include "ole2.h"
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#include "winerror.h"
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#include "winternl.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(hglobalstream);
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struct handle_wrapper
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{
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LONG ref;
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HGLOBAL hglobal;
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ULONG size;
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BOOL delete_on_release;
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CRITICAL_SECTION lock;
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};
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static void handle_addref(struct handle_wrapper *handle)
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{
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InterlockedIncrement(&handle->ref);
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}
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static void handle_release(struct handle_wrapper *handle)
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{
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ULONG ref = InterlockedDecrement(&handle->ref);
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if (!ref)
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{
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if (handle->delete_on_release)
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{
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GlobalFree(handle->hglobal);
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handle->hglobal = NULL;
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}
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handle->lock.DebugInfo->Spare[0] = 0;
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DeleteCriticalSection(&handle->lock);
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HeapFree(GetProcessHeap(), 0, handle);
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}
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}
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static ULONG handle_read(struct handle_wrapper *handle, ULONG *pos, void *dest, ULONG len)
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{
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void *source;
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EnterCriticalSection(&handle->lock);
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if (*pos < handle->size)
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len = min(handle->size - *pos, len);
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else
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len = 0;
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source = GlobalLock(handle->hglobal);
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if (source)
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{
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memcpy(dest, (char *)source + *pos, len);
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*pos += len;
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GlobalUnlock(handle->hglobal);
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}
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else
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{
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WARN("read from invalid hglobal %p\n", handle->hglobal);
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len = 0;
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}
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LeaveCriticalSection(&handle->lock);
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return len;
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}
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static ULONG handle_write(struct handle_wrapper *handle, ULONG *pos, const void *source, ULONG len)
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{
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void *dest;
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if (!len)
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return 0;
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EnterCriticalSection(&handle->lock);
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if (*pos + len > handle->size)
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{
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HGLOBAL hglobal = GlobalReAlloc(handle->hglobal, *pos + len, GMEM_MOVEABLE);
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if (hglobal)
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{
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handle->hglobal = hglobal;
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handle->size = *pos + len;
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}
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else
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{
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len = 0;
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goto done;
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}
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}
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dest = GlobalLock(handle->hglobal);
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if (dest)
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{
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memcpy((char *)dest + *pos, source, len);
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*pos += len;
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GlobalUnlock(handle->hglobal);
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}
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else
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{
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WARN("write to invalid hglobal %p\n", handle->hglobal);
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/* len = 0; */
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}
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done:
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LeaveCriticalSection(&handle->lock);
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return len;
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}
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static HGLOBAL handle_gethglobal(struct handle_wrapper *handle)
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{
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return handle->hglobal;
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}
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static HRESULT handle_setsize(struct handle_wrapper *handle, ULONG size)
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{
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HRESULT hr = S_OK;
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EnterCriticalSection(&handle->lock);
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if (handle->size != size)
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{
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HGLOBAL hglobal = GlobalReAlloc(handle->hglobal, size, GMEM_MOVEABLE);
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if (hglobal)
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{
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handle->hglobal = hglobal;
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handle->size = size;
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}
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else
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hr = E_OUTOFMEMORY;
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}
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LeaveCriticalSection(&handle->lock);
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return hr;
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}
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static ULONG handle_getsize(struct handle_wrapper *handle)
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{
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return handle->size;
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}
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static struct handle_wrapper *handle_create(HGLOBAL hglobal, BOOL delete_on_release)
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{
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struct handle_wrapper *handle;
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handle = HeapAlloc(GetProcessHeap(), 0, sizeof(*handle));
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if (handle)
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{
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handle->ref = 1;
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handle->hglobal = hglobal;
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handle->size = GlobalSize(hglobal);
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handle->delete_on_release = delete_on_release;
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InitializeCriticalSection(&handle->lock);
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handle->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": handle_wrapper.lock");
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}
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return handle;
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}
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/****************************************************************************
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* HGLOBALStreamImpl definition.
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*
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* This class implements the IStream interface and represents a stream
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* supported by an HGLOBAL pointer.
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*/
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typedef struct
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{
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IStream IStream_iface;
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LONG ref;
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struct handle_wrapper *handle;
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/* current position of the cursor */
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ULARGE_INTEGER currentPosition;
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} HGLOBALStreamImpl;
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static inline HGLOBALStreamImpl *impl_from_IStream(IStream *iface)
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{
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return CONTAINING_RECORD(iface, HGLOBALStreamImpl, IStream_iface);
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}
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static 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* This = impl_from_IStream(iface);
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if (ppvObject==0)
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return E_INVALIDARG;
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*ppvObject = 0;
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if (IsEqualIID(&IID_IUnknown, riid) ||
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IsEqualIID(&IID_ISequentialStream, riid) ||
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IsEqualIID(&IID_IStream, riid))
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{
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*ppvObject = &This->IStream_iface;
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}
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if ((*ppvObject)==0)
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return E_NOINTERFACE;
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IStream_AddRef(iface);
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return S_OK;
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}
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static ULONG WINAPI HGLOBALStreamImpl_AddRef(IStream* iface)
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{
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HGLOBALStreamImpl* This = impl_from_IStream(iface);
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return InterlockedIncrement(&This->ref);
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}
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static ULONG WINAPI HGLOBALStreamImpl_Release(
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IStream* iface)
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{
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HGLOBALStreamImpl* This= impl_from_IStream(iface);
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ULONG ref = InterlockedDecrement(&This->ref);
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if (!ref)
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{
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handle_release(This->handle);
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HeapFree(GetProcessHeap(), 0, This);
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}
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return ref;
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}
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/***
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* This method is part of the 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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static 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* This = impl_from_IStream(iface);
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ULONG num_bytes;
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TRACE("(%p, %p, %d, %p)\n", iface, pv, cb, pcbRead);
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num_bytes = handle_read(This->handle, &This->currentPosition.u.LowPart, pv, cb);
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if (pcbRead) *pcbRead = num_bytes;
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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 ISequentialStream interface.
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*
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* It writes a block of information to the stream at the current
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* position. It then moves the current position at the end of the
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* written block. If the stream is too small to fit the block,
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* the stream is grown to fit.
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*
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* See the documentation of ISequentialStream for more info.
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*/
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static HRESULT WINAPI 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* This = impl_from_IStream(iface);
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ULONG num_bytes;
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TRACE("(%p, %p, %d, %p)\n", iface, pv, cb, pcbWritten);
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num_bytes = handle_write(This->handle, &This->currentPosition.u.LowPart, pv, cb);
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if (pcbWritten) *pcbWritten = num_bytes;
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return (num_bytes < cb) ? E_OUTOFMEMORY : S_OK;
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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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static 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* This = impl_from_IStream(iface);
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ULARGE_INTEGER newPosition = This->currentPosition;
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HRESULT hr = S_OK;
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TRACE("(%p, %x%08x, %d, %p)\n", iface, dlibMove.u.HighPart,
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dlibMove.u.LowPart, dwOrigin, plibNewPosition);
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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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newPosition.u.HighPart = 0;
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newPosition.u.LowPart = 0;
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break;
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case STREAM_SEEK_CUR:
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break;
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case STREAM_SEEK_END:
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newPosition.QuadPart = handle_getsize(This->handle);
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break;
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default:
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hr = STG_E_SEEKERROR;
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goto end;
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}
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/*
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* Move the actual file pointer
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* If the file pointer ends-up after the end of the stream, the next Write operation will
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* make the file larger. This is how it is documented.
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*/
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newPosition.u.HighPart = 0;
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newPosition.u.LowPart += dlibMove.QuadPart;
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if (dlibMove.u.LowPart >= 0x80000000 &&
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newPosition.u.LowPart >= dlibMove.u.LowPart)
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{
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/* We tried to seek backwards and went past the start. */
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hr = STG_E_SEEKERROR;
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goto end;
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}
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This->currentPosition = newPosition;
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end:
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if (plibNewPosition) *plibNewPosition = This->currentPosition;
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return hr;
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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 change the size of a stream.
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*
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* TODO: Switch from small blocks to big blocks and vice versa.
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*
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* See the documentation of IStream for more info.
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*/
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static HRESULT WINAPI HGLOBALStreamImpl_SetSize(
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IStream* iface,
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ULARGE_INTEGER libNewSize) /* [in] */
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{
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HGLOBALStreamImpl* This = impl_from_IStream(iface);
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TRACE("(%p, %d)\n", iface, libNewSize.u.LowPart);
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/*
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* HighPart is ignored as shown in tests
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*/
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return handle_setsize(This->handle, libNewSize.u.LowPart);
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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 copy the 'cb' Bytes to 'pstm' IStream.
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*
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* See the documentation of IStream for more info.
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*/
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static 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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{
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HRESULT hr = S_OK;
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BYTE tmpBuffer[128];
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ULONG bytesRead, bytesWritten, copySize;
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ULARGE_INTEGER totalBytesRead;
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ULARGE_INTEGER totalBytesWritten;
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TRACE("(%p, %p, %d, %p, %p)\n", iface, pstm,
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cb.u.LowPart, pcbRead, pcbWritten);
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if ( pstm == 0 )
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return STG_E_INVALIDPOINTER;
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totalBytesRead.QuadPart = 0;
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totalBytesWritten.QuadPart = 0;
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while ( cb.QuadPart > 0 )
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{
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if ( cb.QuadPart >= sizeof(tmpBuffer) )
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copySize = sizeof(tmpBuffer);
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else
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copySize = cb.u.LowPart;
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hr = IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
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if (FAILED(hr))
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break;
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totalBytesRead.QuadPart += bytesRead;
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if (bytesRead)
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{
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hr = IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
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if (FAILED(hr))
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break;
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totalBytesWritten.QuadPart += bytesWritten;
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}
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if (bytesRead!=copySize)
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cb.QuadPart = 0;
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else
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cb.QuadPart -= bytesRead;
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}
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if (pcbRead) pcbRead->QuadPart = totalBytesRead.QuadPart;
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if (pcbWritten) pcbWritten->QuadPart = totalBytesWritten.QuadPart;
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return hr;
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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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* For streams supported by HGLOBALS, this function does nothing.
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* This is what the documentation tells us.
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*
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* See the documentation of IStream for more info.
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*/
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static HRESULT WINAPI HGLOBALStreamImpl_Commit(
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IStream* iface,
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DWORD grfCommitFlags) /* [in] */
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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 IStream interface.
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*
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* For streams supported by HGLOBALS, this function does nothing.
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* This is what the documentation tells us.
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*
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* See the documentation of IStream for more info.
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*/
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static HRESULT WINAPI HGLOBALStreamImpl_Revert(
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IStream* 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 IStream interface.
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*
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* For streams supported by HGLOBALS, this function does nothing.
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* This is what the documentation tells us.
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*
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* See the documentation of IStream for more info.
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*/
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static 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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{
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return STG_E_INVALIDFUNCTION;
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}
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/*
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* This method is part of the IStream interface.
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*
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* For streams supported by HGLOBALS, this function does nothing.
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* This is what the documentation tells us.
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*
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* See the documentation of IStream for more info.
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*/
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static 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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{
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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 IStream interface.
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*
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* This method returns information about the current
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* stream.
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*
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* See the documentation of IStream for more info.
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*/
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static 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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{
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HGLOBALStreamImpl* This = impl_from_IStream(iface);
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memset(pstatstg, 0, sizeof(STATSTG));
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pstatstg->pwcsName = NULL;
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pstatstg->type = STGTY_STREAM;
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pstatstg->cbSize.QuadPart = handle_getsize(This->handle);
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return S_OK;
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}
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static const IStreamVtbl HGLOBALStreamImplVtbl;
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static HGLOBALStreamImpl *HGLOBALStreamImpl_Create(void)
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{
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HGLOBALStreamImpl *This;
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This = HeapAlloc(GetProcessHeap(), 0, sizeof(*This));
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if (This)
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{
|
|
This->IStream_iface.lpVtbl = &HGLOBALStreamImplVtbl;
|
|
This->ref = 1;
|
|
}
|
|
return This;
|
|
}
|
|
|
|
static HRESULT WINAPI HGLOBALStreamImpl_Clone(
|
|
IStream* iface,
|
|
IStream** ppstm) /* [out] */
|
|
{
|
|
HGLOBALStreamImpl* This = impl_from_IStream(iface);
|
|
HGLOBALStreamImpl* clone;
|
|
ULARGE_INTEGER dummy;
|
|
LARGE_INTEGER offset;
|
|
|
|
if (!ppstm) return E_INVALIDARG;
|
|
|
|
*ppstm = NULL;
|
|
|
|
TRACE(" Cloning %p (seek position=%d)\n", iface, This->currentPosition.u.LowPart);
|
|
|
|
clone = HGLOBALStreamImpl_Create();
|
|
if (!clone) return E_OUTOFMEMORY;
|
|
|
|
*ppstm = &clone->IStream_iface;
|
|
|
|
handle_addref(This->handle);
|
|
clone->handle = This->handle;
|
|
|
|
offset.QuadPart = (LONGLONG)This->currentPosition.QuadPart;
|
|
IStream_Seek(*ppstm, offset, STREAM_SEEK_SET, &dummy);
|
|
return S_OK;
|
|
}
|
|
|
|
static const IStreamVtbl HGLOBALStreamImplVtbl =
|
|
{
|
|
HGLOBALStreamImpl_QueryInterface,
|
|
HGLOBALStreamImpl_AddRef,
|
|
HGLOBALStreamImpl_Release,
|
|
HGLOBALStreamImpl_Read,
|
|
HGLOBALStreamImpl_Write,
|
|
HGLOBALStreamImpl_Seek,
|
|
HGLOBALStreamImpl_SetSize,
|
|
HGLOBALStreamImpl_CopyTo,
|
|
HGLOBALStreamImpl_Commit,
|
|
HGLOBALStreamImpl_Revert,
|
|
HGLOBALStreamImpl_LockRegion,
|
|
HGLOBALStreamImpl_UnlockRegion,
|
|
HGLOBALStreamImpl_Stat,
|
|
HGLOBALStreamImpl_Clone
|
|
};
|
|
|
|
/***********************************************************************
|
|
* CreateStreamOnHGlobal [OLE32.@]
|
|
*/
|
|
HRESULT WINAPI CreateStreamOnHGlobal(
|
|
HGLOBAL hGlobal,
|
|
BOOL fDeleteOnRelease,
|
|
LPSTREAM* ppstm)
|
|
{
|
|
HGLOBALStreamImpl* This;
|
|
|
|
if (!ppstm)
|
|
return E_INVALIDARG;
|
|
|
|
This = HGLOBALStreamImpl_Create();
|
|
if (!This) return E_OUTOFMEMORY;
|
|
|
|
/* allocate a handle if one is not supplied */
|
|
if (!hGlobal)
|
|
hGlobal = GlobalAlloc(GMEM_MOVEABLE|GMEM_NODISCARD|GMEM_SHARE, 0);
|
|
|
|
This->handle = handle_create(hGlobal, fDeleteOnRelease);
|
|
|
|
/* start at the beginning */
|
|
This->currentPosition.u.HighPart = 0;
|
|
This->currentPosition.u.LowPart = 0;
|
|
|
|
*ppstm = &This->IStream_iface;
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* GetHGlobalFromStream [OLE32.@]
|
|
*/
|
|
HRESULT WINAPI GetHGlobalFromStream(IStream* pstm, HGLOBAL* phglobal)
|
|
{
|
|
HGLOBALStreamImpl* pStream;
|
|
|
|
if (!pstm || !phglobal)
|
|
return E_INVALIDARG;
|
|
|
|
pStream = impl_from_IStream(pstm);
|
|
|
|
/*
|
|
* Verify that the stream object was created with CreateStreamOnHGlobal.
|
|
*/
|
|
if (pStream->IStream_iface.lpVtbl == &HGLOBALStreamImplVtbl)
|
|
*phglobal = handle_gethglobal(pStream->handle);
|
|
else
|
|
{
|
|
*phglobal = 0;
|
|
return E_INVALIDARG;
|
|
}
|
|
|
|
return S_OK;
|
|
}
|