git.oblomov.eu Git - wine/blob - 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 <string.h>
  30
  31 #include "winbase.h"
  32 #include "winerror.h"
  33 #include "shlobj.h"
  34 #include "wine/debug.h"
  35 #include "shell32_main.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  38
  39 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj);
  40 static ULONG WINAPI IStream_fnAddRef(IStream *iface);
  41 static ULONG WINAPI IStream_fnRelease(IStream *iface);
  42 static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead);
  43 static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten);
  44 static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition);
  45 static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize);
  46 static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten);
  47 static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags);
  48 static HRESULT WINAPI IStream_fnRevert (IStream * iface);
  49 static HRESULT WINAPI IStream_fnLockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType);
  50 static HRESULT WINAPI IStream_fnUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType);
  51 static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG*   pstatstg, DWORD grfStatFlag);
  52 static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm);
  53
  54 static ICOM_VTABLE(IStream) stvt =
  55 {
  56         ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
  57         IStream_fnQueryInterface,
  58         IStream_fnAddRef,
  59         IStream_fnRelease,
  60         IStream_fnRead,
  61         IStream_fnWrite,
  62         IStream_fnSeek,
  63         IStream_fnSetSize,
  64         IStream_fnCopyTo,
  65         IStream_fnCommit,
  66         IStream_fnRevert,
  67         IStream_fnLockRegion,
  68         IStream_fnUnlockRegion,
  69         IStream_fnStat,
  70         IStream_fnClone
  71
  72 };
  73
  74 typedef struct
  75 {       ICOM_VTABLE(IStream)    *lpvtst;
  76         DWORD           ref;
  77         HANDLE          handle;
  78 } ISHFileStream;
  79
  80 /**************************************************************************
  81  *   CreateStreamOnFile()
  82  *
  83  *   similar to CreateStreamOnHGlobal
  84  */
  85 HRESULT CreateStreamOnFile (LPCWSTR pszFilename, DWORD grfMode, IStream ** ppstm)
  86 {
  87         ISHFileStream*  fstr;
  88         HANDLE          handle;
  89         DWORD           access = GENERIC_READ, creat;
  90
  91         if( grfMode & STGM_TRANSACTED )
  92                 return E_INVALIDARG;
  93
  94         if( grfMode & STGM_WRITE )
  95                 access |= GENERIC_WRITE;
  96         if( grfMode & STGM_READWRITE )
  97                 access = GENERIC_WRITE | GENERIC_READ;
  98
  99         if( grfMode & STGM_CREATE )
 100                 creat = CREATE_ALWAYS;
 101         else
 102                 creat = OPEN_EXISTING;
 103
 104         TRACE("Opening %s\n", debugstr_w(pszFilename) );
 105
 106         handle = CreateFileW( pszFilename, access, 0, NULL, creat, 0, NULL );
 107         if( handle == INVALID_HANDLE_VALUE )
 108                 return E_FAIL;
 109
 110         fstr = (ISHFileStream*)HeapAlloc(GetProcessHeap(),
 111                 HEAP_ZERO_MEMORY,sizeof(ISHFileStream));
 112         if( !fstr )
 113                 return E_FAIL;
 114         fstr->lpvtst=&stvt;
 115         fstr->ref = 1;
 116         fstr->handle = handle;
 117
 118         (*ppstm) = (IStream*)fstr;
 119
 120         return S_OK;
 121 }
 122
 123 /**************************************************************************
 124 *  IStream_fnQueryInterface
 125 */
 126 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
 127 {
 128         ICOM_THIS(ISHFileStream, iface);
 129
 130         TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);
 131
 132         *ppvObj = NULL;
 133
 134         if(IsEqualIID(riid, &IID_IUnknown) ||
 135            IsEqualIID(riid, &IID_IStream))
 136         {
 137           *ppvObj = This;
 138         }
 139
 140         if(*ppvObj)
 141         {
 142           IStream_AddRef((IStream*)*ppvObj);
 143           TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
 144           return S_OK;
 145         }
 146         TRACE("-- Interface: E_NOINTERFACE\n");
 147         return E_NOINTERFACE;
 148 }
 149
 150 /**************************************************************************
 151 *  IStream_fnAddRef
 152 */
 153 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
 154 {
 155         ICOM_THIS(ISHFileStream, iface);
 156
 157         TRACE("(%p)->(count=%lu)\n",This, This->ref);
 158
 159         return ++(This->ref);
 160 }
 161
 162 /**************************************************************************
 163 *  IStream_fnRelease
 164 */
 165 static ULONG WINAPI IStream_fnRelease(IStream *iface)
 166 {
 167         ICOM_THIS(ISHFileStream, iface);
 168
 169         TRACE("(%p)->()\n",This);
 170
 171         if (!--(This->ref))
 172         {
 173                 TRACE(" destroying SHFileStream (%p)\n",This);
 174                 CloseHandle(This->handle);
 175                 HeapFree(GetProcessHeap(),0,This);
 176         }
 177         return This->ref;
 178 }
 179
 180 static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead)
 181 {
 182         ICOM_THIS(ISHFileStream, iface);
 183
 184         TRACE("(%p)->(%p,0x%08lx,%p)\n",This, pv, cb, pcbRead);
 185
 186         if ( !pv )
 187                 return STG_E_INVALIDPOINTER;
 188
 189         if ( ! ReadFile( This->handle, pv, cb, pcbRead, NULL ) )
 190                 return E_FAIL;
 191
 192         return S_OK;
 193 }
 194
 195 static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten)
 196 {
 197         ICOM_THIS(ISHFileStream, iface);
 198
 199         TRACE("(%p)\n",This);
 200
 201         if( !pv )
 202                 return STG_E_INVALIDPOINTER;
 203
 204         if( ! WriteFile( This->handle, pv, cb, pcbWritten, NULL ) )
 205                 return E_FAIL;
 206
 207         return S_OK;
 208 }
 209
 210 static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition)
 211 {
 212         DWORD pos, newposlo, newposhi;
 213
 214         ICOM_THIS(ISHFileStream, iface);
 215
 216         TRACE("(%p)\n",This);
 217
 218         pos = dlibMove.QuadPart; /* FIXME: truncates */
 219         newposhi = 0;
 220         newposlo = SetFilePointer( This->handle, pos, &newposhi, dwOrigin );
 221         if( newposlo == INVALID_SET_FILE_POINTER )
 222                 return E_FAIL;
 223
 224         plibNewPosition->QuadPart = newposlo | ( (LONGLONG)newposhi<<32);
 225
 226         return S_OK;
 227 }
 228
 229 static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize)
 230 {
 231         ICOM_THIS(ISHFileStream, iface);
 232
 233         TRACE("(%p)\n",This);
 234
 235         if( ! SetFilePointer( This->handle, libNewSize.QuadPart, NULL, FILE_BEGIN ) )
 236                 return E_FAIL;
 237
 238         if( ! SetEndOfFile( This->handle ) )
 239                 return E_FAIL;
 240
 241         return S_OK;
 242 }
 243 static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
 244 {
 245         ICOM_THIS(ISHFileStream, iface);
 246
 247         TRACE("(%p)\n",This);
 248
 249         return E_NOTIMPL;
 250 }
 251 static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags)
 252 {
 253         ICOM_THIS(ISHFileStream, iface);
 254
 255         TRACE("(%p)\n",This);
 256
 257         return E_NOTIMPL;
 258 }
 259 static HRESULT WINAPI IStream_fnRevert (IStream * iface)
 260 {
 261         ICOM_THIS(ISHFileStream, iface);
 262
 263         TRACE("(%p)\n",This);
 264
 265         return E_NOTIMPL;
 266 }
 267 static HRESULT WINAPI IStream_fnLockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 268 {
 269         ICOM_THIS(ISHFileStream, iface);
 270
 271         TRACE("(%p)\n",This);
 272
 273         return E_NOTIMPL;
 274 }
 275 static HRESULT WINAPI IStream_fnUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 276 {
 277         ICOM_THIS(ISHFileStream, iface);
 278
 279         TRACE("(%p)\n",This);
 280
 281         return E_NOTIMPL;
 282 }
 283 static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG*   pstatstg, DWORD grfStatFlag)
 284 {
 285         ICOM_THIS(ISHFileStream, iface);
 286
 287         TRACE("(%p)\n",This);
 288
 289         return E_NOTIMPL;
 290 }
 291 static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm)
 292 {
 293         ICOM_THIS(ISHFileStream, iface);
 294
 295         TRACE("(%p)\n",This);
 296
 297         return E_NOTIMPL;
 298 }