reactos/lib/shlwapi/regstream.c

   1 /*
   2  * SHLWAPI Registry Stream functions
   3  *
   4  * Copyright 1999 Juergen Schmied
   5  * Copyright 2002 Jon Griffiths
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <stdarg.h>
  23 #include <string.h>
  24
  25 #include "winerror.h"
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "objbase.h"
  29 #include "winreg.h"
  30
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  34
  35 typedef struct
  36 {       IStreamVtbl *lpVtbl;
  37         DWORD  ref;
  38         HKEY   hKey;
  39         LPBYTE pbBuffer;
  40         DWORD  dwLength;
  41         DWORD  dwPos;
  42 } ISHRegStream;
  43
  44 /**************************************************************************
  45 *  IStream_fnQueryInterface
  46 */
  47 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
  48 {
  49         ISHRegStream *This = (ISHRegStream *)iface;
  50
  51         TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);
  52
  53         *ppvObj = NULL;
  54
  55         if(IsEqualIID(riid, &IID_IUnknown))     /*IUnknown*/
  56           *ppvObj = This;
  57         else if(IsEqualIID(riid, &IID_IStream)) /*IStream*/
  58           *ppvObj = This;
  59
  60         if(*ppvObj)
  61         {
  62           IStream_AddRef((IStream*)*ppvObj);
  63           TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
  64           return S_OK;
  65         }
  66         TRACE("-- Interface: E_NOINTERFACE\n");
  67         return E_NOINTERFACE;
  68 }
  69
  70 /**************************************************************************
  71 *  IStream_fnAddRef
  72 */
  73 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
  74 {
  75         ISHRegStream *This = (ISHRegStream *)iface;
  76
  77         TRACE("(%p)->(count=%lu)\n",This, This->ref);
  78
  79         return InterlockedIncrement(&This->ref);
  80 }
  81
  82 /**************************************************************************
  83 *  IStream_fnRelease
  84 */
  85 static ULONG WINAPI IStream_fnRelease(IStream *iface)
  86 {
  87         ISHRegStream *This = (ISHRegStream *)iface;
  88
  89         TRACE("(%p)->()\n",This);
  90
  91         if (!InterlockedDecrement(&This->ref))
  92         {
  93           TRACE(" destroying SHReg IStream (%p)\n",This);
  94
  95           if (This->pbBuffer)
  96             HeapFree(GetProcessHeap(),0,This->pbBuffer);
  97
  98           if (This->hKey)
  99             RegCloseKey(This->hKey);
 100
 101           HeapFree(GetProcessHeap(),0,This);
 102           return 0;
 103         }
 104         return This->ref;
 105 }
 106
 107 /**************************************************************************
 108  * IStream_fnRead
 109  */
 110 static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead)
 111 {
 112         ISHRegStream *This = (ISHRegStream *)iface;
 113
 114         DWORD dwBytesToRead, dwBytesLeft;
 115
 116         TRACE("(%p)->(%p,0x%08lx,%p)\n",This, pv, cb, pcbRead);
 117
 118         if (!pv)
 119           return STG_E_INVALIDPOINTER;
 120
 121         dwBytesLeft = This->dwLength - This->dwPos;
 122
 123         if ( 0 >= dwBytesLeft ) /* end of buffer */
 124           return S_FALSE;
 125
 126         dwBytesToRead = ( cb > dwBytesLeft) ? dwBytesLeft : cb;
 127
 128         memmove ( pv, (This->pbBuffer) + (This->dwPos), dwBytesToRead);
 129
 130         This->dwPos += dwBytesToRead; /* adjust pointer */
 131
 132         if (pcbRead)
 133           *pcbRead = dwBytesToRead;
 134
 135         return S_OK;
 136 }
 137
 138 /**************************************************************************
 139  * IStream_fnWrite
 140  */
 141 static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten)
 142 {
 143         ISHRegStream *This = (ISHRegStream *)iface;
 144
 145         TRACE("(%p)\n",This);
 146
 147         if (pcbWritten)
 148           *pcbWritten = 0;
 149
 150         return E_NOTIMPL;
 151 }
 152
 153 /**************************************************************************
 154  *  IStream_fnSeek
 155  */
 156 static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition)
 157 {
 158         ISHRegStream *This = (ISHRegStream *)iface;
 159
 160         TRACE("(%p)\n",This);
 161
 162         if (plibNewPosition)
 163           plibNewPosition->QuadPart = 0;
 164         return E_NOTIMPL;
 165 }
 166
 167 /**************************************************************************
 168  * IStream_fnSetSize
 169  */
 170 static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize)
 171 {
 172         ISHRegStream *This = (ISHRegStream *)iface;
 173
 174         TRACE("(%p)\n",This);
 175         return E_NOTIMPL;
 176 }
 177
 178 /**************************************************************************
 179  * IStream_fnCopyTo
 180  */
 181 static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
 182 {
 183         ISHRegStream *This = (ISHRegStream *)iface;
 184
 185         TRACE("(%p)\n",This);
 186         if (pcbRead)
 187           pcbRead->QuadPart = 0;
 188         if (pcbWritten)
 189           pcbWritten->QuadPart = 0;
 190         return E_NOTIMPL;
 191 }
 192
 193 /**************************************************************************
 194  * IStream_fnCommit
 195  */
 196 static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags)
 197 {
 198         ISHRegStream *This = (ISHRegStream *)iface;
 199
 200         TRACE("(%p)\n",This);
 201
 202         return E_NOTIMPL;
 203 }
 204
 205 /**************************************************************************
 206  * IStream_fnRevert
 207  */
 208 static HRESULT WINAPI IStream_fnRevert (IStream * iface)
 209 {
 210         ISHRegStream *This = (ISHRegStream *)iface;
 211
 212         TRACE("(%p)\n",This);
 213
 214         return E_NOTIMPL;
 215 }
 216
 217 /**************************************************************************
 218  * IStream_fnLockUnlockRegion
 219  */
 220 static HRESULT WINAPI IStream_fnLockUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 221 {
 222         ISHRegStream *This = (ISHRegStream *)iface;
 223
 224         TRACE("(%p)\n",This);
 225
 226         return E_NOTIMPL;
 227 }
 228
 229 /*************************************************************************
 230  * IStream_fnStat
 231  */
 232 static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG*   pstatstg, DWORD grfStatFlag)
 233 {
 234         ISHRegStream *This = (ISHRegStream *)iface;
 235
 236         TRACE("(%p)\n",This);
 237
 238         return E_NOTIMPL;
 239 }
 240
 241 /*************************************************************************
 242  * IStream_fnClone
 243  */
 244 static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm)
 245 {
 246         ISHRegStream *This = (ISHRegStream *)iface;
 247
 248         TRACE("(%p)\n",This);
 249         if (ppstm)
 250           *ppstm = NULL;
 251         return E_NOTIMPL;
 252 }
 253
 254 static struct IStreamVtbl rstvt =
 255 {
 256         IStream_fnQueryInterface,
 257         IStream_fnAddRef,
 258         IStream_fnRelease,
 259         IStream_fnRead,
 260         IStream_fnWrite,
 261         IStream_fnSeek,
 262         IStream_fnSetSize,
 263         IStream_fnCopyTo,
 264         IStream_fnCommit,
 265         IStream_fnRevert,
 266         IStream_fnLockUnlockRegion,
 267         IStream_fnLockUnlockRegion,
 268         IStream_fnStat,
 269         IStream_fnClone
 270 };
 271
 272 /* Methods overridden by the dummy stream */
 273
 274 /**************************************************************************
 275  *  IStream_fnAddRefDummy
 276  */
 277 static ULONG WINAPI IStream_fnAddRefDummy(IStream *iface)
 278 {
 279         ISHRegStream *This = (ISHRegStream *)iface;
 280         TRACE("(%p)\n", This);
 281         return 2;
 282 }
 283
 284 /**************************************************************************
 285  *  IStream_fnReleaseDummy
 286  */
 287 static ULONG WINAPI IStream_fnReleaseDummy(IStream *iface)
 288 {
 289         ISHRegStream *This = (ISHRegStream *)iface;
 290         TRACE("(%p)\n", This);
 291         return 1;
 292 }
 293
 294 /**************************************************************************
 295  * IStream_fnReadDummy
 296  */
 297 static HRESULT WINAPI IStream_fnReadDummy(IStream *iface, LPVOID pv, ULONG cb, ULONG* pcbRead)
 298 {
 299   if (pcbRead)
 300     *pcbRead = 0;
 301   return E_NOTIMPL;
 302 }
 303
 304 static struct IStreamVtbl DummyRegStreamVTable =
 305 {
 306   IStream_fnQueryInterface,
 307   IStream_fnAddRefDummy,  /* Overridden */
 308   IStream_fnReleaseDummy, /* Overridden */
 309   IStream_fnReadDummy,    /* Overridden */
 310   IStream_fnWrite,
 311   IStream_fnSeek,
 312   IStream_fnSetSize,
 313   IStream_fnCopyTo,
 314   IStream_fnCommit,
 315   IStream_fnRevert,
 316   IStream_fnLockUnlockRegion,
 317   IStream_fnLockUnlockRegion,
 318   IStream_fnStat,
 319   IStream_fnClone
 320 };
 321
 322 /* Dummy registry stream object */
 323 static ISHRegStream rsDummyRegStream =
 324 {
 325  &DummyRegStreamVTable,
 326  1,
 327  NULL,
 328  NULL,
 329  0,
 330  0
 331 };
 332
 333 /**************************************************************************
 334  * IStream_Create
 335  *
 336  * Internal helper: Create and initialise a new registry stream object.
 337  */
 338 static IStream *IStream_Create(HKEY hKey, LPBYTE pbBuffer, DWORD dwLength)
 339 {
 340  ISHRegStream* regStream;
 341
 342  regStream = (ISHRegStream*)HeapAlloc(GetProcessHeap(), 0, sizeof(ISHRegStream));
 343
 344  if (regStream)
 345  {
 346    regStream->lpVtbl = &rstvt;
 347    regStream->ref = 1;
 348    regStream->hKey = hKey;
 349    regStream->pbBuffer = pbBuffer;
 350    regStream->dwLength = dwLength;
 351    regStream->dwPos = 0;
 352  }
 353  TRACE ("Returning %p\n", regStream);
 354  return (IStream *)regStream;
 355 }
 356
 357 /*************************************************************************
 358  * SHOpenRegStream2A    [SHLWAPI.@]
 359  *
 360  * Create a stream to read binary registry data.
 361  *
 362  * PARAMS
 363  * hKey      [I] Registry handle
 364  * pszSubkey [I] The sub key name
 365  * pszValue  [I] The value name under the sub key
 366  * dwMode    [I] Unused
 367  *
 368  * RETURNS
 369  * Success: An IStream interface referring to the registry data
 370  * Failure: NULL, if the registry key could not be opened or is not binary.
 371  */
 372 IStream * WINAPI SHOpenRegStream2A(HKEY hKey, LPCSTR pszSubkey,
 373                                    LPCSTR pszValue,DWORD dwMode)
 374 {
 375   HKEY hStrKey = NULL;
 376   LPBYTE lpBuff = NULL;
 377   DWORD dwLength, dwType;
 378
 379   TRACE("(%p,%s,%s,0x%08lx)\n", hKey, pszSubkey, pszValue, dwMode);
 380
 381   /* Open the key, read in binary data and create stream */
 382   if (!RegOpenKeyExA (hKey, pszSubkey, 0, KEY_READ, &hStrKey) &&
 383       !RegQueryValueExA (hStrKey, pszValue, 0, 0, 0, &dwLength) &&
 384       (lpBuff = HeapAlloc (GetProcessHeap(), 0, dwLength)) &&
 385       !RegQueryValueExA (hStrKey, pszValue, 0, &dwType, lpBuff, &dwLength) &&
 386       dwType == REG_BINARY)
 387     return IStream_Create(hStrKey, lpBuff, dwLength);
 388
 389   if (lpBuff)
 390     HeapFree (GetProcessHeap(), 0, lpBuff);
 391   if (hStrKey)
 392     RegCloseKey(hStrKey);
 393   return NULL;
 394 }
 395
 396 /*************************************************************************
 397  * SHOpenRegStream2W    [SHLWAPI.@]
 398  *
 399  * See SHOpenRegStream2A.
 400  */
 401 IStream * WINAPI SHOpenRegStream2W(HKEY hKey, LPCWSTR pszSubkey,
 402                                    LPCWSTR pszValue, DWORD dwMode)
 403 {
 404   HKEY hStrKey = NULL;
 405   LPBYTE lpBuff = NULL;
 406   DWORD dwLength, dwType;
 407
 408   TRACE("(%p,%s,%s,0x%08lx)\n", hKey, debugstr_w(pszSubkey),
 409         debugstr_w(pszValue), dwMode);
 410
 411   /* Open the key, read in binary data and create stream */
 412   if (!RegOpenKeyExW (hKey, pszSubkey, 0, KEY_READ, &hStrKey) &&
 413       !RegQueryValueExW (hStrKey, pszValue, 0, 0, 0, &dwLength) &&
 414       (lpBuff = HeapAlloc (GetProcessHeap(), 0, dwLength)) &&
 415       !RegQueryValueExW (hStrKey, pszValue, 0, &dwType, lpBuff, &dwLength) &&
 416       dwType == REG_BINARY)
 417     return IStream_Create(hStrKey, lpBuff, dwLength);
 418
 419   if (lpBuff)
 420     HeapFree (GetProcessHeap(), 0, lpBuff);
 421   if (hStrKey)
 422     RegCloseKey(hStrKey);
 423   return NULL;
 424 }
 425
 426 /*************************************************************************
 427  * SHOpenRegStreamA     [SHLWAPI.@]
 428  *
 429  * Create a stream to read binary registry data.
 430  *
 431  * PARAMS
 432  * hKey      [I] Registry handle
 433  * pszSubkey [I] The sub key name
 434  * pszValue  [I] The value name under the sub key
 435  * dwMode    [I] STGM mode for opening the file
 436  *
 437  * RETURNS
 438  * Success: An IStream interface referring to the registry data
 439  * Failure: If the registry key could not be opened or is not binary,
 440  *          A dummy (empty) IStream object is returned.
 441  */
 442 IStream * WINAPI SHOpenRegStreamA(HKEY hkey, LPCSTR pszSubkey,
 443                                   LPCSTR pszValue, DWORD dwMode)
 444 {
 445   IStream *iStream;
 446
 447   TRACE("(%p,%s,%s,0x%08lx)\n", hkey, pszSubkey, pszValue, dwMode);
 448
 449   iStream = SHOpenRegStream2A(hkey, pszSubkey, pszValue, dwMode);
 450   return iStream ? iStream : (IStream *)&rsDummyRegStream;
 451 }
 452
 453 /*************************************************************************
 454  * SHOpenRegStreamW     [SHLWAPI.@]
 455  *
 456  * See SHOpenRegStreamA.
 457  */
 458 IStream * WINAPI SHOpenRegStreamW(HKEY hkey, LPCWSTR pszSubkey,
 459                                   LPCWSTR pszValue, DWORD dwMode)
 460 {
 461   IStream *iStream;
 462
 463   TRACE("(%p,%s,%s,0x%08lx)\n", hkey, debugstr_w(pszSubkey),
 464         debugstr_w(pszValue), dwMode);
 465   iStream = SHOpenRegStream2W(hkey, pszSubkey, pszValue, dwMode);
 466   return iStream ? iStream : (IStream *)&rsDummyRegStream;
 467 }
 468
 469 /*************************************************************************
 470  * @   [SHLWAPI.12]
 471  *
 472  * Create an IStream object on a block of memory.
 473  *
 474  * PARAMS
 475  * lpbData   [I] Memory block to create the IStream object on
 476  * dwDataLen [I] Length of data block
 477  *
 478  * RETURNS
 479  * Success: A pointer to the IStream object.
 480  * Failure: NULL, if any parameters are invalid or an error occurs.
 481  *
 482  * NOTES
 483  *  A copy of the memory pointed to by lpbData is made, and is freed
 484  *  when the stream is released.
 485  */
 486 IStream * WINAPI SHCreateMemStream(LPBYTE lpbData, DWORD dwDataLen)
 487 {
 488   IStream *iStrmRet = NULL;
 489
 490   TRACE("(%p,%ld)\n", lpbData, dwDataLen);
 491
 492   if (lpbData)
 493   {
 494     LPBYTE lpbDup = (LPBYTE)HeapAlloc(GetProcessHeap(), 0, dwDataLen);
 495
 496     if (lpbDup)
 497     {
 498       memcpy(lpbDup, lpbData, dwDataLen);
 499       iStrmRet = IStream_Create(NULL, lpbDup, dwDataLen);
 500
 501       if (!iStrmRet)
 502         HeapFree(GetProcessHeap(), 0, lpbDup);
 503     }
 504   }
 505   return iStrmRet;
 506 }
 507
 508 /*************************************************************************
 509  * SHCreateStreamWrapper   [SHLWAPI.@]
 510  *
 511  * Create an IStream object on a block of memory.
 512  *
 513  * PARAMS
 514  * lpbData    [I] Memory block to create the IStream object on
 515  * dwDataLen  [I] Length of data block
 516  * dwReserved [I] Reserved, Must be 0.
 517  * lppStream  [O] Destination for IStream object
 518  *
 519  * RETURNS
 520  * Success: S_OK. lppStream contains the new IStream object.
 521  * Failure: E_INVALIDARG, if any parameters are invalid,
 522  *          E_OUTOFMEMORY if memory allocation fails.
 523  *
 524  * NOTES
 525  *  The stream assumes ownership of the memory passed to it.
 526  */
 527 HRESULT WINAPI SHCreateStreamWrapper(LPBYTE lpbData, DWORD dwDataLen,
 528                                      DWORD dwReserved, IStream **lppStream)
 529 {
 530   IStream* lpStream;
 531
 532   if (lppStream)
 533     *lppStream = NULL;
 534
 535   if(dwReserved || !lppStream)
 536     return E_INVALIDARG;
 537
 538   lpStream = IStream_Create(NULL, lpbData, dwDataLen);
 539
 540   if(!lpStream)
 541     return E_OUTOFMEMORY;
 542
 543   IStream_QueryInterface(lpStream, &IID_IStream, (void**)lppStream);
 544   IStream_Release(lpStream);
 545   return S_OK;
 546 }