dlls/ole32/memlockbytes16.c

   1 /*
   2  * Global memory implementation of ILockBytes.
   3  *
   4  * Copyright 1999 Thuy Nguyen
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <assert.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26
  27 #define NONAMELESSUNION
  28 #define NONAMELESSSTRUCT
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "wine/winbase16.h"
  32 #include "winuser.h"
  33 #include "objbase.h"
  34 #include "ole2.h"
  35 #include "winerror.h"
  36
  37 #include "ifs.h"
  38
  39 #include "wine/debug.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  42
  43 /******************************************************************************
  44  * HGLOBALLockBytesImpl16 definition.
  45  *
  46  * This class implements the ILockBytes interface and represents a byte array
  47  * object supported by an HGLOBAL pointer.
  48  */
  49 struct HGLOBALLockBytesImpl16
  50 {
  51   /*
  52    * Needs to be the first item in the struct
  53    * since we want to cast this in an ILockBytes pointer
  54    */
  55   const ILockBytes16Vtbl *lpVtbl;
  56   LONG        ref;
  57
  58   /*
  59    * Support for the LockBytes object
  60    */
  61   HGLOBAL16 supportHandle;
  62
  63   /*
  64    * This flag is TRUE if the HGLOBAL is destroyed when the object
  65    * is finally released.
  66    */
  67   BOOL    deleteOnRelease;
  68   /*
  69    * Helper variable that contains the size of the byte array
  70    */
  71   ULARGE_INTEGER     byteArraySize;
  72 };
  73
  74 typedef struct HGLOBALLockBytesImpl16 HGLOBALLockBytesImpl16;
  75
  76 /******************************************************************************
  77  *
  78  * HGLOBALLockBytesImpl16 implementation
  79  *
  80  */
  81
  82 /******************************************************************************
  83  * This is the constructor for the HGLOBALLockBytesImpl16 class.
  84  *
  85  * Params:
  86  *    hGlobal          - Handle that will support the stream. can be NULL.
  87  *    fDeleteOnRelease - Flag set to TRUE if the HGLOBAL16 will be released
  88  *                       when the IStream object is destroyed.
  89  */
  90 static HGLOBALLockBytesImpl16*
  91 HGLOBALLockBytesImpl16_Construct(HGLOBAL16 hGlobal,
  92                                  BOOL16 fDeleteOnRelease)
  93 {
  94   HGLOBALLockBytesImpl16* newLockBytes;
  95
  96   static ILockBytes16Vtbl vt16;
  97   static SEGPTR msegvt16;
  98   HMODULE16 hcomp = GetModuleHandle16("OLE2");
  99
 100
 101   TRACE("(%x,%d)\n",hGlobal,fDeleteOnRelease);
 102   newLockBytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl16));
 103   if (newLockBytes == NULL)
 104     return NULL;
 105
 106   /*
 107    * Set up the virtual function table and reference count.
 108    */
 109   if (!msegvt16)
 110   {
 111 #define VTENT(x) vt16.x = (void*)GetProcAddress16(hcomp,"HGLOBALLockBytesImpl16_"#x);assert(vt16.x)
 112       VTENT(QueryInterface);
 113       VTENT(AddRef);
 114       VTENT(Release);
 115       VTENT(ReadAt);
 116       VTENT(WriteAt);
 117       VTENT(Flush);
 118       VTENT(SetSize);
 119       VTENT(LockRegion);
 120       VTENT(UnlockRegion);
 121 #undef VTENT
 122       msegvt16 = MapLS( &vt16 );
 123   }
 124   newLockBytes->lpVtbl  = (const ILockBytes16Vtbl*)msegvt16;
 125   newLockBytes->ref     = 0;
 126   /*
 127    * Initialize the support.
 128    */
 129   newLockBytes->supportHandle = hGlobal;
 130   newLockBytes->deleteOnRelease = fDeleteOnRelease;
 131
 132   /*
 133    * This method will allocate a handle if one is not supplied.
 134    */
 135   if (newLockBytes->supportHandle == 0)
 136     newLockBytes->supportHandle = GlobalAlloc16(GMEM_MOVEABLE | GMEM_NODISCARD, 0);
 137
 138   /*
 139    * Initialize the size of the array to the size of the handle.
 140    */
 141   newLockBytes->byteArraySize.u.HighPart = 0;
 142   newLockBytes->byteArraySize.u.LowPart  = GlobalSize16(
 143                                             newLockBytes->supportHandle);
 144
 145   return (HGLOBALLockBytesImpl16*)MapLS(newLockBytes);
 146 }
 147
 148 /******************************************************************************
 149  * This is the destructor of the HGLOBALStreamImpl class.
 150  *
 151  * This method will clean-up all the resources used-up by the given
 152  * HGLOBALLockBytesImpl16 class. The pointer passed-in to this function will be
 153  * freed and will not be valid anymore.
 154  */
 155 static void HGLOBALLockBytesImpl16_Destroy(HGLOBALLockBytesImpl16* This)
 156 {
 157   TRACE("()\n");
 158   /*
 159    * Release the HGlobal if the constructor asked for that.
 160    */
 161   if (This->deleteOnRelease)
 162   {
 163     GlobalFree16(This->supportHandle);
 164     This->supportHandle = 0;
 165   }
 166
 167   /*
 168    * Finally, free the memory used-up by the class.
 169    */
 170   HeapFree(GetProcessHeap(), 0, This);
 171 }
 172
 173 /******************************************************************************
 174  * This implements the IUnknown method AddRef for this
 175  * class
 176  */
 177 ULONG CDECL HGLOBALLockBytesImpl16_AddRef(ILockBytes16* iface)
 178 {
 179   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
 180
 181   TRACE("(%p)\n",This);
 182
 183   return InterlockedIncrement(&This->ref);
 184 }
 185
 186
 187 /******************************************************************************
 188  * This implements the IUnknown method QueryInterface for this
 189  * class
 190  */
 191 HRESULT CDECL HGLOBALLockBytesImpl16_QueryInterface(
 192       ILockBytes16*  iface,     /* [in] SEGPTR */
 193       REFIID       riid,        /* [in] */
 194       void**       ppvObject)   /* [out][iid_is] (ptr to SEGPTR!) */
 195 {
 196   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)MapSL((SEGPTR)iface);
 197
 198   TRACE("(%p,%s,%p)\n",iface,debugstr_guid(riid),ppvObject);
 199   /*
 200    * Perform a sanity check on the parameters.
 201    */
 202   if (ppvObject==0)
 203     return E_INVALIDARG;
 204
 205   /*
 206    * Initialize the return parameter.
 207    */
 208   *ppvObject = 0;
 209   /*
 210    * Compare the riid with the interface IDs implemented by this object.
 211    */
 212   if (  !memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) ||
 213         !memcmp(&IID_ILockBytes, riid, sizeof(IID_ILockBytes))
 214   )
 215     *ppvObject = (void*)iface;
 216
 217   /*
 218    * Check that we obtained an interface.
 219    */
 220   if ((*ppvObject)==0) {
 221     FIXME("Unknown IID %s\n", debugstr_guid(riid));
 222     return E_NOINTERFACE;
 223   }
 224
 225   /*
 226    * Query Interface always increases the reference count by one when it is
 227    * successful
 228    */
 229   HGLOBALLockBytesImpl16_AddRef((ILockBytes16*)This);
 230
 231   return S_OK;
 232 }
 233
 234 /******************************************************************************
 235  * This implements the IUnknown method Release for this
 236  * class
 237  */
 238 ULONG CDECL HGLOBALLockBytesImpl16_Release(ILockBytes16* iface)
 239 {
 240   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
 241   ULONG ref;
 242
 243   TRACE("(%p)\n",This);
 244
 245   ref = InterlockedDecrement(&This->ref);
 246
 247   /*
 248    * If the reference count goes down to 0, perform suicide.
 249    */
 250   if (ref==0)
 251     HGLOBALLockBytesImpl16_Destroy(This);
 252   return ref;
 253 }
 254
 255 /******************************************************************************
 256  * This method is part of the ILockBytes interface.
 257  *
 258  * It reads a block of information from the byte array at the specified
 259  * offset.
 260  *
 261  * See the documentation of ILockBytes for more info.
 262  */
 263 HRESULT CDECL HGLOBALLockBytesImpl16_ReadAt(
 264       ILockBytes16*  iface,
 265       ULARGE_INTEGER ulOffset,  /* [in] */
 266       void*          pv,        /* [out][length_is][size_is] */
 267       ULONG          cb,        /* [in] */
 268       ULONG*         pcbRead)   /* [out] */
 269 {
 270   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
 271
 272   void* supportBuffer;
 273   ULONG bytesReadBuffer = 0;
 274   ULONG bytesToReadFromBuffer;
 275
 276   TRACE("(%p,%d,%p,%d,%p)\n",This,ulOffset.u.LowPart,pv,cb,pcbRead);
 277   /*
 278    * If the caller is not interested in the number of bytes read,
 279    * we use another buffer to avoid "if" statements in the code.
 280    */
 281   if (pcbRead == 0)
 282     pcbRead = &bytesReadBuffer;
 283
 284   /*
 285    * Make sure the offset is valid.
 286    */
 287   if (ulOffset.u.LowPart > This->byteArraySize.u.LowPart)
 288     return E_FAIL;
 289
 290   /*
 291    * Using the known size of the array, calculate the number of bytes
 292    * to read.
 293    */
 294   bytesToReadFromBuffer = min(This->byteArraySize.u.LowPart -
 295                               ulOffset.u.LowPart, cb);
 296
 297   /*
 298    * Lock the buffer in position and copy the data.
 299    */
 300   supportBuffer = GlobalLock16(This->supportHandle);
 301
 302   memcpy(pv,
 303          (char *) supportBuffer + ulOffset.u.LowPart,
 304          bytesToReadFromBuffer);
 305
 306   /*
 307    * Return the number of bytes read.
 308    */
 309   *pcbRead = bytesToReadFromBuffer;
 310
 311   /*
 312    * Cleanup
 313    */
 314   GlobalUnlock16(This->supportHandle);
 315
 316   /*
 317    * The function returns S_OK if the specified number of bytes were read
 318    * or the end of the array was reached.
 319    * It returns STG_E_READFAULT if the number of bytes to read does not equal
 320    * the number of bytes actually read.
 321    */
 322   if(*pcbRead == cb)
 323     return S_OK;
 324
 325   return STG_E_READFAULT;
 326 }
 327
 328 /******************************************************************************
 329  * This method is part of the ILockBytes interface.
 330  *
 331  * It will change the size of the byte array.
 332  *
 333  * See the documentation of ILockBytes for more info.
 334  */
 335 HRESULT CDECL HGLOBALLockBytesImpl16_SetSize(
 336       ILockBytes16*   iface,
 337       ULARGE_INTEGER  libNewSize)   /* [in] */
 338 {
 339   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
 340   HGLOBAL16 supportHandle;
 341
 342   TRACE("(%p,%d)\n",This,libNewSize.u.LowPart);
 343   /*
 344    * As documented.
 345    */
 346   if (libNewSize.u.HighPart != 0)
 347     return STG_E_INVALIDFUNCTION;
 348
 349   if (This->byteArraySize.u.LowPart == libNewSize.u.LowPart)
 350     return S_OK;
 351
 352   /*
 353    * Re allocate the HGlobal to fit the new size of the stream.
 354    */
 355   supportHandle = GlobalReAlloc16(This->supportHandle, libNewSize.u.LowPart, 0);
 356
 357   if (supportHandle == 0)
 358     return STG_E_MEDIUMFULL;
 359
 360   This->supportHandle = supportHandle;
 361   This->byteArraySize.u.LowPart = libNewSize.u.LowPart;
 362
 363   return S_OK;
 364 }
 365
 366 /******************************************************************************
 367  * This method is part of the ILockBytes interface.
 368  *
 369  * It writes the specified bytes at the specified offset.
 370  * position. If the array is too small, it will be resized.
 371  *
 372  * See the documentation of ILockBytes for more info.
 373  */
 374 HRESULT CDECL HGLOBALLockBytesImpl16_WriteAt(
 375       ILockBytes16*  iface,
 376       ULARGE_INTEGER ulOffset,    /* [in] */
 377       const void*    pv,          /* [in][size_is] */
 378       ULONG          cb,          /* [in] */
 379       ULONG*         pcbWritten)  /* [out] */
 380 {
 381   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
 382
 383   void*          supportBuffer;
 384   ULARGE_INTEGER newSize;
 385   ULONG          bytesWritten = 0;
 386
 387   TRACE("(%p,%d,%p,%d,%p)\n",This,ulOffset.u.LowPart,pv,cb,pcbWritten);
 388   /*
 389    * If the caller is not interested in the number of bytes written,
 390    * we use another buffer to avoid "if" statements in the code.
 391    */
 392   if (pcbWritten == 0)
 393     pcbWritten = &bytesWritten;
 394
 395   if (cb == 0)
 396     return S_OK;
 397
 398   newSize.u.HighPart = 0;
 399   newSize.u.LowPart = ulOffset.u.LowPart + cb;
 400
 401   /*
 402    * Verify if we need to grow the stream
 403    */
 404   if (newSize.u.LowPart > This->byteArraySize.u.LowPart)
 405   {
 406     /* grow stream */
 407     if (HGLOBALLockBytesImpl16_SetSize(iface, newSize) == STG_E_MEDIUMFULL)
 408       return STG_E_MEDIUMFULL;
 409   }
 410
 411   /*
 412    * Lock the buffer in position and copy the data.
 413    */
 414   supportBuffer = GlobalLock16(This->supportHandle);
 415
 416   memcpy((char *) supportBuffer + ulOffset.u.LowPart, pv, cb);
 417
 418   /*
 419    * Return the number of bytes written.
 420    */
 421   *pcbWritten = cb;
 422
 423   /*
 424    * Cleanup
 425    */
 426   GlobalUnlock16(This->supportHandle);
 427
 428   return S_OK;
 429 }
 430
 431 /******************************************************************************
 432  * This method is part of the ILockBytes interface.
 433  *
 434  * See the documentation of ILockBytes for more info.
 435  */
 436 HRESULT CDECL HGLOBALLockBytesImpl16_Flush(ILockBytes16* iface)
 437 {
 438   TRACE("(%p)\n",iface);
 439   return S_OK;
 440 }
 441
 442 /******************************************************************************
 443  * This method is part of the ILockBytes interface.
 444  *
 445  * The global memory implementation of ILockBytes does not support locking.
 446  *
 447  * See the documentation of ILockBytes for more info.
 448  */
 449 HRESULT CDECL HGLOBALLockBytesImpl16_LockRegion(
 450       ILockBytes16*  iface,
 451       ULARGE_INTEGER libOffset,   /* [in] */
 452       ULARGE_INTEGER cb,          /* [in] */
 453       DWORD          dwLockType)  /* [in] */
 454 {
 455   return STG_E_INVALIDFUNCTION;
 456 }
 457
 458 /******************************************************************************
 459  * This method is part of the ILockBytes interface.
 460  *
 461  * The global memory implementation of ILockBytes does not support locking.
 462  *
 463  * See the documentation of ILockBytes for more info.
 464  */
 465 HRESULT CDECL HGLOBALLockBytesImpl16_UnlockRegion(
 466       ILockBytes16*  iface,
 467       ULARGE_INTEGER libOffset,   /* [in] */
 468       ULARGE_INTEGER cb,          /* [in] */
 469       DWORD          dwLockType)  /* [in] */
 470 {
 471   return STG_E_INVALIDFUNCTION;
 472 }
 473
 474 /******************************************************************************
 475  * This method is part of the ILockBytes interface.
 476  *
 477  * This method returns information about the current
 478  * byte array object.
 479  *
 480  * See the documentation of ILockBytes for more info.
 481  */
 482 HRESULT CDECL HGLOBALLockBytesImpl16_Stat(
 483       ILockBytes16*iface,
 484       STATSTG16*   pstatstg,     /* [out] */
 485       DWORD        grfStatFlag)  /* [in] */
 486 {
 487   HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
 488
 489   memset(pstatstg, 0, sizeof(STATSTG16));
 490
 491   pstatstg->pwcsName = NULL;
 492   pstatstg->type     = STGTY_LOCKBYTES;
 493   pstatstg->cbSize   = This->byteArraySize;
 494
 495   return S_OK;
 496 }
 497
 498 /******************************************************************************
 499  *           CreateILockBytesOnHGlobal     [OLE2.54]
 500  *
 501  * Creates an ILockBytes interface for a HGLOBAL handle.
 502  *
 503  * PARAMS
 504  *      hGlobal                 the global handle (16bit)
 505  *      fDeleteOnRelease        delete handle on release.
 506  *      ppLkbyt                 pointer to ILockBytes interface.
 507  *
 508  * RETURNS
 509  *      Staddard OLE error return codes.
 510  *
 511  */
 512 HRESULT WINAPI CreateILockBytesOnHGlobal16(
 513         HGLOBAL16      hGlobal,          /* [in] */
 514         BOOL16         fDeleteOnRelease, /* [in] */
 515         LPLOCKBYTES16 *ppLkbyt)          /* [out] (ptr to SEGPTR!) */
 516 {
 517   HGLOBALLockBytesImpl16* newLockBytes; /* SEGPTR */
 518
 519   newLockBytes = HGLOBALLockBytesImpl16_Construct(hGlobal, fDeleteOnRelease);
 520
 521   if (newLockBytes != NULL)
 522     return HGLOBALLockBytesImpl16_QueryInterface((ILockBytes16*)newLockBytes,
 523                                    &IID_ILockBytes,
 524                                    (void**)ppLkbyt);
 525   return E_OUTOFMEMORY;
 526 }