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Sweden-Number/dlls/shell32/memorystream.c

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/*
* this class implements a pure IStream object
* and can be used for many purposes
*
* the main reason for implementing this was
* a cleaner implementation of IShellLink which
* needs to be able to load lnk's from a IStream
* interface so it was obvious to capsule the file
* access in a IStream to.
*
* Copyright 1999 Juergen Schmied
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include "winbase.h"
#include "winerror.h"
#include "shlobj.h"
#include "wine/debug.h"
#include "shell32_main.h"
WINE_DEFAULT_DEBUG_CHANNEL(shell);
static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj);
static ULONG WINAPI IStream_fnAddRef(IStream *iface);
static ULONG WINAPI IStream_fnRelease(IStream *iface);
static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead);
static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten);
static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition);
static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize);
static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten);
static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags);
static HRESULT WINAPI IStream_fnRevert (IStream * iface);
static HRESULT WINAPI IStream_fnLockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType);
static HRESULT WINAPI IStream_fnUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType);
static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG* pstatstg, DWORD grfStatFlag);
static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm);
static ICOM_VTABLE(IStream) stvt =
{
ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
IStream_fnQueryInterface,
IStream_fnAddRef,
IStream_fnRelease,
IStream_fnRead,
IStream_fnWrite,
IStream_fnSeek,
IStream_fnSetSize,
IStream_fnCopyTo,
IStream_fnCommit,
IStream_fnRevert,
IStream_fnLockRegion,
IStream_fnUnlockRegion,
IStream_fnStat,
IStream_fnClone
};
typedef struct
{ ICOM_VTABLE(IStream) *lpvtst;
DWORD ref;
LPBYTE pImage;
HANDLE hMapping;
DWORD dwLength;
DWORD dwPos;
} ISHFileStream;
/**************************************************************************
* CreateStreamOnFile()
*
* similar to CreateStreamOnHGlobal
*/
HRESULT CreateStreamOnFile (LPCSTR pszFilename, IStream ** ppstm)
{
ISHFileStream* fstr;
OFSTRUCT ofs;
HFILE hFile = OpenFile( pszFilename, &ofs, OF_READ );
HRESULT ret = E_FAIL;
fstr = (ISHFileStream*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(ISHFileStream));
fstr->lpvtst=&stvt;
fstr->ref = 1;
fstr->dwLength = GetFileSize (hFile, NULL);
if (!(fstr->hMapping = CreateFileMappingA(hFile,NULL,PAGE_READONLY|SEC_COMMIT,0,0,NULL)))
{
WARN("failed to create filemap.\n");
goto end_2;
}
if (!(fstr->pImage = MapViewOfFile(fstr->hMapping,FILE_MAP_READ,0,0,0)))
{
WARN("failed to mmap filemap.\n");
goto end_3;
}
ret = S_OK;
goto end_1;
end_3: CloseHandle(fstr->hMapping);
end_2: HeapFree(GetProcessHeap(), 0, fstr);
fstr = NULL;
end_1: _lclose(hFile);
(*ppstm) = (IStream*)fstr;
return ret;
}
/**************************************************************************
* IStream_fnQueryInterface
*/
static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);
*ppvObj = NULL;
if(IsEqualIID(riid, &IID_IUnknown) ||
IsEqualIID(riid, &IID_IStream))
{
*ppvObj = This;
}
if(*ppvObj)
{
IStream_AddRef((IStream*)*ppvObj);
TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
return S_OK;
}
TRACE("-- Interface: E_NOINTERFACE\n");
return E_NOINTERFACE;
}
/**************************************************************************
* IStream_fnAddRef
*/
static ULONG WINAPI IStream_fnAddRef(IStream *iface)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)->(count=%lu)\n",This, This->ref);
return ++(This->ref);
}
/**************************************************************************
* IStream_fnRelease
*/
static ULONG WINAPI IStream_fnRelease(IStream *iface)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)->()\n",This);
if (!--(This->ref))
{ TRACE(" destroying SHFileStream (%p)\n",This);
UnmapViewOfFile(This->pImage);
CloseHandle(This->hMapping);
HeapFree(GetProcessHeap(),0,This);
return 0;
}
return This->ref;
}
static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead)
{
ICOM_THIS(ISHFileStream, iface);
DWORD dwBytesToRead, dwBytesLeft;
TRACE("(%p)->(%p,0x%08lx,%p)\n",This, pv, cb, pcbRead);
if ( !pv )
return STG_E_INVALIDPOINTER;
dwBytesLeft = This->dwLength - This->dwPos;
if ( 0 >= dwBytesLeft ) /* end of buffer */
return S_FALSE;
dwBytesToRead = ( cb > dwBytesLeft) ? dwBytesLeft : cb;
memmove ( pv, (This->pImage) + (This->dwPos), dwBytesToRead);
This->dwPos += dwBytesToRead; /* adjust pointer */
if (pcbRead)
*pcbRead = dwBytesToRead;
return S_OK;
}
static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnRevert (IStream * iface)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnLockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG* pstatstg, DWORD grfStatFlag)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm)
{
ICOM_THIS(ISHFileStream, iface);
TRACE("(%p)\n",This);
return E_NOTIMPL;
}
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