dlls/shell32/memorystream.c

   1 /*
   2  *      this class implements a pure IStream object
   3  *      and can be used for many purposes
   4  *
   5  *      the main reason for implementing this was
   6  *      a cleaner implementation of IShellLink which
   7  *      needs to be able to load lnk's from a IStream
   8  *      interface so it was obvious to capsule the file
   9  *      access in a IStream to.
  10  *
  11  * Copyright 1999 Juergen Schmied
  12  * Copyright 2003 Mike McCormack for CodeWeavers
  13  *
  14  * This library is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU Lesser General Public
  16  * License as published by the Free Software Foundation; either
  17  * version 2.1 of the License, or (at your option) any later version.
  18  *
  19  * This library is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22  * Lesser General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Lesser General Public
  25  * License along with this library; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  */
  28
  29 #include <stdarg.h>
  30 #include <string.h>
  31
  32 #define COBJMACROS
  33
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "winerror.h"
  37 #include "winuser.h"
  38 #include "wingdi.h"
  39 #include "shlobj.h"
  40 #include "wine/debug.h"
  41 #include "shell32_main.h"
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  44
  45 static const IStreamVtbl stvt;
  46
  47 typedef struct
  48 {
  49         const IStreamVtbl       *lpvtst;
  50         DWORD           ref;
  51         HANDLE          handle;
  52 } ISHFileStream;
  53
  54 /**************************************************************************
  55  *   CreateStreamOnFile()
  56  *
  57  *   similar to CreateStreamOnHGlobal
  58  */
  59 HRESULT CreateStreamOnFile (LPCWSTR pszFilename, DWORD grfMode, IStream ** ppstm)
  60 {
  61         ISHFileStream*  fstr;
  62         HANDLE          handle;
  63         DWORD           access = GENERIC_READ, creat;
  64
  65         if( grfMode & STGM_TRANSACTED )
  66                 return E_INVALIDARG;
  67
  68         if( grfMode & STGM_WRITE )
  69                 access |= GENERIC_WRITE;
  70         if( grfMode & STGM_READWRITE )
  71                 access = GENERIC_WRITE | GENERIC_READ;
  72
  73         if( grfMode & STGM_CREATE )
  74                 creat = CREATE_ALWAYS;
  75         else
  76                 creat = OPEN_EXISTING;
  77
  78         TRACE("Opening %s\n", debugstr_w(pszFilename) );
  79
  80        handle = CreateFileW( pszFilename, access, FILE_SHARE_READ, NULL, creat, 0, NULL );
  81         if( handle == INVALID_HANDLE_VALUE )
  82                 return HRESULT_FROM_WIN32(GetLastError());
  83
  84         fstr = (ISHFileStream*)HeapAlloc(GetProcessHeap(),
  85                 HEAP_ZERO_MEMORY,sizeof(ISHFileStream));
  86         if( !fstr )
  87                 return E_OUTOFMEMORY;
  88         fstr->lpvtst=&stvt;
  89         fstr->ref = 1;
  90         fstr->handle = handle;
  91
  92         (*ppstm) = (IStream*)fstr;
  93
  94         return S_OK;
  95 }
  96
  97 /**************************************************************************
  98 *  IStream_fnQueryInterface
  99 */
 100 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
 101 {
 102         ISHFileStream *This = (ISHFileStream *)iface;
 103
 104         TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);
 105
 106         *ppvObj = NULL;
 107
 108         if(IsEqualIID(riid, &IID_IUnknown) ||
 109            IsEqualIID(riid, &IID_IStream))
 110         {
 111           *ppvObj = This;
 112         }
 113
 114         if(*ppvObj)
 115         {
 116           IStream_AddRef((IStream*)*ppvObj);
 117           TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
 118           return S_OK;
 119         }
 120         TRACE("-- Interface: E_NOINTERFACE\n");
 121         return E_NOINTERFACE;
 122 }
 123
 124 /**************************************************************************
 125 *  IStream_fnAddRef
 126 */
 127 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
 128 {
 129         ISHFileStream *This = (ISHFileStream *)iface;
 130
 131         TRACE("(%p)->(count=%lu)\n",This, This->ref);
 132
 133         return ++(This->ref);
 134 }
 135
 136 /**************************************************************************
 137 *  IStream_fnRelease
 138 */
 139 static ULONG WINAPI IStream_fnRelease(IStream *iface)
 140 {
 141         ISHFileStream *This = (ISHFileStream *)iface;
 142
 143         TRACE("(%p)->()\n",This);
 144
 145         if (!--(This->ref))
 146         {
 147                 TRACE(" destroying SHFileStream (%p)\n",This);
 148                 CloseHandle(This->handle);
 149                 HeapFree(GetProcessHeap(),0,This);
 150         }
 151         return This->ref;
 152 }
 153
 154 static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead)
 155 {
 156         ISHFileStream *This = (ISHFileStream *)iface;
 157
 158         TRACE("(%p)->(%p,0x%08lx,%p)\n",This, pv, cb, pcbRead);
 159
 160         if ( !pv )
 161                 return STG_E_INVALIDPOINTER;
 162
 163         if ( ! ReadFile( This->handle, pv, cb, pcbRead, NULL ) )
 164                 return S_FALSE;
 165
 166         return S_OK;
 167 }
 168
 169 static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten)
 170 {
 171        DWORD dummy_count;
 172         ISHFileStream *This = (ISHFileStream *)iface;
 173
 174         TRACE("(%p)\n",This);
 175
 176         if( !pv )
 177                 return STG_E_INVALIDPOINTER;
 178
 179        /* WriteFile() doesn't allow to specify NULL as write count pointer */
 180        if (!pcbWritten)
 181                pcbWritten = &dummy_count;
 182
 183         if( ! WriteFile( This->handle, pv, cb, pcbWritten, NULL ) )
 184                 return E_FAIL;
 185
 186         return S_OK;
 187 }
 188
 189 static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition)
 190 {
 191         DWORD pos, newposlo, newposhi;
 192
 193         ISHFileStream *This = (ISHFileStream *)iface;
 194
 195         TRACE("(%p)\n",This);
 196
 197         pos = dlibMove.QuadPart; /* FIXME: truncates */
 198         newposhi = 0;
 199         newposlo = SetFilePointer( This->handle, pos, &newposhi, dwOrigin );
 200         if( newposlo == INVALID_SET_FILE_POINTER )
 201                 return E_FAIL;
 202
 203         plibNewPosition->QuadPart = newposlo | ( (LONGLONG)newposhi<<32);
 204
 205         return S_OK;
 206 }
 207
 208 static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize)
 209 {
 210         ISHFileStream *This = (ISHFileStream *)iface;
 211
 212         TRACE("(%p)\n",This);
 213
 214         if( ! SetFilePointer( This->handle, libNewSize.QuadPart, NULL, FILE_BEGIN ) )
 215                 return E_FAIL;
 216
 217         if( ! SetEndOfFile( This->handle ) )
 218                 return E_FAIL;
 219
 220         return S_OK;
 221 }
 222 static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
 223 {
 224         ISHFileStream *This = (ISHFileStream *)iface;
 225
 226         TRACE("(%p)\n",This);
 227
 228         return E_NOTIMPL;
 229 }
 230 static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags)
 231 {
 232         ISHFileStream *This = (ISHFileStream *)iface;
 233
 234         TRACE("(%p)\n",This);
 235
 236         return E_NOTIMPL;
 237 }
 238 static HRESULT WINAPI IStream_fnRevert (IStream * iface)
 239 {
 240         ISHFileStream *This = (ISHFileStream *)iface;
 241
 242         TRACE("(%p)\n",This);
 243
 244         return E_NOTIMPL;
 245 }
 246 static HRESULT WINAPI IStream_fnLockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 247 {
 248         ISHFileStream *This = (ISHFileStream *)iface;
 249
 250         TRACE("(%p)\n",This);
 251
 252         return E_NOTIMPL;
 253 }
 254 static HRESULT WINAPI IStream_fnUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 255 {
 256         ISHFileStream *This = (ISHFileStream *)iface;
 257
 258         TRACE("(%p)\n",This);
 259
 260         return E_NOTIMPL;
 261 }
 262 static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG*   pstatstg, DWORD grfStatFlag)
 263 {
 264         ISHFileStream *This = (ISHFileStream *)iface;
 265
 266         TRACE("(%p)\n",This);
 267
 268         return E_NOTIMPL;
 269 }
 270 static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm)
 271 {
 272         ISHFileStream *This = (ISHFileStream *)iface;
 273
 274         TRACE("(%p)\n",This);
 275
 276         return E_NOTIMPL;
 277 }
 278
 279 static const IStreamVtbl stvt =
 280 {
 281         IStream_fnQueryInterface,
 282         IStream_fnAddRef,
 283         IStream_fnRelease,
 284         IStream_fnRead,
 285         IStream_fnWrite,
 286         IStream_fnSeek,
 287         IStream_fnSetSize,
 288         IStream_fnCopyTo,
 289         IStream_fnCommit,
 290         IStream_fnRevert,
 291         IStream_fnLockRegion,
 292         IStream_fnUnlockRegion,
 293         IStream_fnStat,
 294         IStream_fnClone
 295
 296 };