dlls/combase/hglobalstream.c

   1 /*
   2  * HGLOBAL Stream implementation
   3  *
   4  * Copyright 1999 Francis Beaudet
   5  * Copyright 2016 Dmitry Timoshkov
   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #define COBJMACROS
  23 #define NONAMELESSUNION
  24
  25 #include "objbase.h"
  26
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(storage);
  30
  31 struct handle_wrapper
  32 {
  33     LONG ref;
  34     HGLOBAL hglobal;
  35     ULONG size;
  36     BOOL delete_on_release;
  37 };
  38
  39 static void handle_addref(struct handle_wrapper *handle)
  40 {
  41     InterlockedIncrement(&handle->ref);
  42 }
  43
  44 static void handle_release(struct handle_wrapper *handle)
  45 {
  46     ULONG ref = InterlockedDecrement(&handle->ref);
  47
  48     if (!ref)
  49     {
  50         if (handle->delete_on_release) GlobalFree(handle->hglobal);
  51         free(handle);
  52     }
  53 }
  54
  55 static struct handle_wrapper *handle_create(HGLOBAL hglobal, BOOL delete_on_release)
  56 {
  57     struct handle_wrapper *handle;
  58
  59     handle = malloc(sizeof(*handle));
  60     if (!handle) return NULL;
  61
  62     /* allocate a handle if one is not supplied */
  63     if (!hglobal) hglobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD | GMEM_SHARE, 0);
  64     if (!hglobal)
  65     {
  66         free(handle);
  67         return NULL;
  68     }
  69     handle->ref = 1;
  70     handle->hglobal = hglobal;
  71     handle->size = GlobalSize(hglobal);
  72     handle->delete_on_release = delete_on_release;
  73
  74     return handle;
  75 }
  76
  77 struct hglobal_stream
  78 {
  79     IStream IStream_iface;
  80     LONG ref;
  81
  82     struct handle_wrapper *handle;
  83     ULARGE_INTEGER position;
  84 };
  85
  86 static inline struct hglobal_stream *impl_from_IStream(IStream *iface)
  87 {
  88     return CONTAINING_RECORD(iface, struct hglobal_stream, IStream_iface);
  89 }
  90
  91 static const IStreamVtbl hglobalstreamvtbl;
  92
  93 static struct hglobal_stream *hglobalstream_construct(void)
  94 {
  95     struct hglobal_stream *object = calloc(1, sizeof(*object));
  96
  97     if (object)
  98     {
  99         object->IStream_iface.lpVtbl = &hglobalstreamvtbl;
 100         object->ref = 1;
 101     }
 102     return object;
 103 }
 104
 105 static HRESULT WINAPI stream_QueryInterface(IStream *iface, REFIID riid, void **obj)
 106 {
 107     if (!obj)
 108         return E_INVALIDARG;
 109
 110     if (IsEqualIID(&IID_IUnknown, riid) ||
 111         IsEqualIID(&IID_ISequentialStream, riid) ||
 112         IsEqualIID(&IID_IStream, riid))
 113     {
 114         *obj = iface;
 115         IStream_AddRef(iface);
 116         return S_OK;
 117     }
 118
 119     *obj = NULL;
 120     return E_NOINTERFACE;
 121 }
 122
 123 static ULONG WINAPI stream_AddRef(IStream *iface)
 124 {
 125     struct hglobal_stream *stream = impl_from_IStream(iface);
 126     return InterlockedIncrement(&stream->ref);
 127 }
 128
 129 static ULONG WINAPI stream_Release(IStream *iface)
 130 {
 131     struct hglobal_stream *stream = impl_from_IStream(iface);
 132     ULONG ref = InterlockedDecrement(&stream->ref);
 133
 134     if (!ref)
 135     {
 136         handle_release(stream->handle);
 137         free(stream);
 138     }
 139
 140     return ref;
 141 }
 142
 143 static HRESULT WINAPI stream_Read(IStream *iface, void *pv, ULONG cb, ULONG *read_len)
 144 {
 145     struct hglobal_stream *stream = impl_from_IStream(iface);
 146     ULONG dummy, len;
 147     char *buffer;
 148
 149     TRACE("%p, %p, %ld, %p\n", iface, pv, cb, read_len);
 150
 151     if (!read_len)
 152         read_len = &dummy;
 153
 154     len = min(stream->handle->size - stream->position.u.LowPart, cb);
 155
 156     buffer = GlobalLock(stream->handle->hglobal);
 157     if (!buffer)
 158     {
 159         WARN("Failed to lock hglobal %p\n", stream->handle->hglobal);
 160         *read_len = 0;
 161         return S_OK;
 162     }
 163
 164     memcpy(pv, buffer + stream->position.u.LowPart, len);
 165     stream->position.u.LowPart += len;
 166
 167     *read_len = len;
 168
 169     GlobalUnlock(stream->handle->hglobal);
 170
 171     return S_OK;
 172 }
 173
 174 static HRESULT WINAPI stream_Write(IStream *iface, const void *pv, ULONG cb, ULONG *written)
 175 {
 176     struct hglobal_stream *stream = impl_from_IStream(iface);
 177     ULARGE_INTEGER size;
 178     ULONG dummy = 0;
 179     char *buffer;
 180
 181     TRACE("%p, %p, %ld, %p\n", iface, pv, cb, written);
 182
 183     if (!written)
 184         written = &dummy;
 185
 186     if (!cb)
 187         goto out;
 188
 189     *written = 0;
 190
 191     size.u.HighPart = 0;
 192     size.u.LowPart = stream->position.u.LowPart + cb;
 193
 194     if (size.u.LowPart > stream->handle->size)
 195     {
 196         /* grow stream */
 197         HRESULT hr = IStream_SetSize(iface, size);
 198         if (FAILED(hr))
 199         {
 200             ERR("IStream_SetSize failed with error %#lx\n", hr);
 201             return hr;
 202         }
 203     }
 204
 205     buffer = GlobalLock(stream->handle->hglobal);
 206     if (!buffer)
 207     {
 208         WARN("write to invalid hglobal %p\n", stream->handle->hglobal);
 209         return S_OK;
 210     }
 211
 212     memcpy(buffer + stream->position.u.LowPart, pv, cb);
 213     stream->position.u.LowPart += cb;
 214
 215     GlobalUnlock(stream->handle->hglobal);
 216
 217 out:
 218     *written = cb;
 219
 220     return S_OK;
 221 }
 222
 223 static HRESULT WINAPI stream_Seek(IStream *iface, LARGE_INTEGER move, DWORD origin,
 224         ULARGE_INTEGER *pos)
 225 {
 226     struct hglobal_stream *stream = impl_from_IStream(iface);
 227     ULARGE_INTEGER position = stream->position;
 228     HRESULT hr = S_OK;
 229
 230     TRACE("%p, %s, %ld, %p\n", iface, wine_dbgstr_longlong(move.QuadPart), origin, pos);
 231
 232     switch (origin)
 233     {
 234         case STREAM_SEEK_SET:
 235             position.QuadPart = 0;
 236             break;
 237         case STREAM_SEEK_CUR:
 238             break;
 239         case STREAM_SEEK_END:
 240             position.QuadPart = stream->handle->size;
 241             break;
 242         default:
 243             hr = STG_E_SEEKERROR;
 244             goto end;
 245     }
 246
 247     position.u.HighPart = 0;
 248     position.u.LowPart += move.QuadPart;
 249
 250     if (move.u.LowPart >= 0x80000000 && position.u.LowPart >= move.u.LowPart)
 251     {
 252         /* We tried to seek backwards and went past the start. */
 253         hr = STG_E_SEEKERROR;
 254         goto end;
 255     }
 256
 257     stream->position = position;
 258
 259 end:
 260     if (pos) *pos = stream->position;
 261
 262     return hr;
 263 }
 264
 265 static HRESULT WINAPI stream_SetSize(IStream *iface, ULARGE_INTEGER size)
 266 {
 267     struct hglobal_stream *stream = impl_from_IStream(iface);
 268     HGLOBAL hglobal;
 269
 270     TRACE("%p, %s\n", iface, wine_dbgstr_longlong(size.QuadPart));
 271
 272     if (stream->handle->size == size.u.LowPart)
 273         return S_OK;
 274
 275     hglobal = GlobalReAlloc(stream->handle->hglobal, size.u.LowPart, GMEM_MOVEABLE);
 276     if (!hglobal)
 277         return E_OUTOFMEMORY;
 278
 279     stream->handle->hglobal = hglobal;
 280     stream->handle->size = size.u.LowPart;
 281
 282     return S_OK;
 283 }
 284
 285 static HRESULT WINAPI stream_CopyTo(IStream *iface, IStream *dest, ULARGE_INTEGER cb,
 286         ULARGE_INTEGER *read_len, ULARGE_INTEGER *written)
 287 {
 288     ULARGE_INTEGER total_read, total_written;
 289     HRESULT hr = S_OK;
 290     BYTE buffer[128];
 291
 292     TRACE("%p, %p, %ld, %p, %p\n", iface, dest, cb.u.LowPart, read_len, written);
 293
 294     if (!dest)
 295         return STG_E_INVALIDPOINTER;
 296
 297     total_read.QuadPart = 0;
 298     total_written.QuadPart = 0;
 299
 300     while (cb.QuadPart > 0)
 301     {
 302         ULONG chunk_size = cb.QuadPart >= sizeof(buffer) ? sizeof(buffer) : cb.u.LowPart;
 303         ULONG chunk_read, chunk_written;
 304
 305         hr = IStream_Read(iface, buffer, chunk_size, &chunk_read);
 306         if (FAILED(hr))
 307             break;
 308
 309         total_read.QuadPart += chunk_read;
 310
 311         if (chunk_read)
 312         {
 313             hr = IStream_Write(dest, buffer, chunk_read, &chunk_written);
 314             if (FAILED(hr))
 315                 break;
 316
 317             total_written.QuadPart += chunk_written;
 318         }
 319
 320         if (chunk_read != chunk_size)
 321             cb.QuadPart = 0;
 322         else
 323             cb.QuadPart -= chunk_read;
 324     }
 325
 326     if (read_len)
 327         read_len->QuadPart = total_read.QuadPart;
 328     if (written)
 329         written->QuadPart = total_written.QuadPart;
 330
 331     return hr;
 332 }
 333
 334 static HRESULT WINAPI stream_Commit(IStream *iface, DWORD flags)
 335 {
 336     return S_OK;
 337 }
 338
 339 static HRESULT WINAPI stream_Revert(IStream *iface)
 340 {
 341     return S_OK;
 342 }
 343
 344 static HRESULT WINAPI stream_LockRegion(IStream *iface, ULARGE_INTEGER offset,
 345         ULARGE_INTEGER len, DWORD lock_type)
 346 {
 347     return STG_E_INVALIDFUNCTION;
 348 }
 349
 350 static HRESULT WINAPI stream_UnlockRegion(IStream *iface, ULARGE_INTEGER offset,
 351         ULARGE_INTEGER len, DWORD lock_type)
 352 {
 353     return S_OK;
 354 }
 355
 356 static HRESULT WINAPI stream_Stat(IStream *iface, STATSTG *pstatstg, DWORD flags)
 357 {
 358     struct hglobal_stream *stream = impl_from_IStream(iface);
 359
 360     memset(pstatstg, 0, sizeof(STATSTG));
 361
 362     pstatstg->pwcsName = NULL;
 363     pstatstg->type = STGTY_STREAM;
 364     pstatstg->cbSize.QuadPart = stream->handle->size;
 365
 366     return S_OK;
 367 }
 368
 369 static HRESULT WINAPI stream_Clone(IStream *iface, IStream **ppstm)
 370 {
 371     struct hglobal_stream *stream = impl_from_IStream(iface), *clone;
 372     ULARGE_INTEGER dummy;
 373     LARGE_INTEGER offset;
 374
 375     TRACE("%p, %p\n", iface, ppstm);
 376
 377     *ppstm = NULL;
 378
 379     clone = hglobalstream_construct();
 380     if (!clone) return E_OUTOFMEMORY;
 381
 382     *ppstm = &clone->IStream_iface;
 383     handle_addref(stream->handle);
 384     clone->handle = stream->handle;
 385
 386     offset.QuadPart = (LONGLONG)stream->position.QuadPart;
 387     IStream_Seek(*ppstm, offset, STREAM_SEEK_SET, &dummy);
 388     return S_OK;
 389 }
 390
 391 static const IStreamVtbl hglobalstreamvtbl =
 392 {
 393     stream_QueryInterface,
 394     stream_AddRef,
 395     stream_Release,
 396     stream_Read,
 397     stream_Write,
 398     stream_Seek,
 399     stream_SetSize,
 400     stream_CopyTo,
 401     stream_Commit,
 402     stream_Revert,
 403     stream_LockRegion,
 404     stream_UnlockRegion,
 405     stream_Stat,
 406     stream_Clone
 407 };
 408
 409 /***********************************************************************
 410  *           CreateStreamOnHGlobal     (combase.@)
 411  */
 412 HRESULT WINAPI CreateStreamOnHGlobal(HGLOBAL hGlobal, BOOL delete_on_release, IStream **stream)
 413 {
 414     struct hglobal_stream *object;
 415
 416     if (!stream)
 417         return E_INVALIDARG;
 418
 419     object = hglobalstream_construct();
 420     if (!object) return E_OUTOFMEMORY;
 421
 422     object->handle = handle_create(hGlobal, delete_on_release);
 423     if (!object->handle)
 424     {
 425         free(object);
 426         return E_OUTOFMEMORY;
 427     }
 428
 429     *stream = &object->IStream_iface;
 430
 431     return S_OK;
 432 }
 433
 434 /***********************************************************************
 435  *           GetHGlobalFromStream     (combase.@)
 436  */
 437 HRESULT WINAPI GetHGlobalFromStream(IStream *stream, HGLOBAL *phglobal)
 438 {
 439     struct hglobal_stream *object;
 440
 441     if (!stream || !phglobal)
 442         return E_INVALIDARG;
 443
 444     object = impl_from_IStream(stream);
 445
 446     if (object->IStream_iface.lpVtbl == &hglobalstreamvtbl)
 447         *phglobal = object->handle->hglobal;
 448     else
 449     {
 450         *phglobal = 0;
 451         return E_INVALIDARG;
 452     }
 453
 454     return S_OK;
 455 }