dlls/itss/storage.c

   1 /*
   2  *    ITSS Storage implementation
   3  *
   4  * Copyright 2004 Mike McCormack
   5  *
   6  *  see http://bonedaddy.net/pabs3/hhm/#chmspec
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23
  24 #include <stdarg.h>
  25 #include <stdio.h>
  26
  27 #define COBJMACROS
  28
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winuser.h"
  32 #include "ole2.h"
  33
  34 #include "chm_lib.h"
  35 #include "itsstor.h"
  36
  37 #include "wine/itss.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(itss);
  41
  42 /************************************************************************/
  43
  44 typedef struct _ITSS_IStorageImpl
  45 {
  46     IStorage IStorage_iface;
  47     LONG ref;
  48     struct chmFile *chmfile;
  49     WCHAR dir[1];
  50 } ITSS_IStorageImpl;
  51
  52 struct enum_info
  53 {
  54     struct enum_info *next, *prev;
  55     struct chmUnitInfo ui;
  56 };
  57
  58 typedef struct _IEnumSTATSTG_Impl
  59 {
  60     IEnumSTATSTG IEnumSTATSTG_iface;
  61     LONG ref;
  62     struct enum_info *first, *last, *current;
  63 } IEnumSTATSTG_Impl;
  64
  65 typedef struct _IStream_Impl
  66 {
  67     IStream IStream_iface;
  68     LONG ref;
  69     ITSS_IStorageImpl *stg;
  70     ULONGLONG addr;
  71     struct chmUnitInfo ui;
  72 } IStream_Impl;
  73
  74 static inline ITSS_IStorageImpl *impl_from_IStorage(IStorage *iface)
  75 {
  76     return CONTAINING_RECORD(iface, ITSS_IStorageImpl, IStorage_iface);
  77 }
  78
  79 static inline IEnumSTATSTG_Impl *impl_from_IEnumSTATSTG(IEnumSTATSTG *iface)
  80 {
  81     return CONTAINING_RECORD(iface, IEnumSTATSTG_Impl, IEnumSTATSTG_iface);
  82 }
  83
  84 static inline IStream_Impl *impl_from_IStream(IStream *iface)
  85 {
  86     return CONTAINING_RECORD(iface, IStream_Impl, IStream_iface);
  87 }
  88
  89 static HRESULT ITSS_create_chm_storage(
  90            struct chmFile *chmfile, const WCHAR *dir, IStorage** ppstgOpen );
  91 static IStream_Impl* ITSS_create_stream(
  92            ITSS_IStorageImpl *stg, struct chmUnitInfo *ui );
  93
  94 /************************************************************************/
  95
  96 static HRESULT WINAPI ITSS_IEnumSTATSTG_QueryInterface(
  97     IEnumSTATSTG* iface,
  98     REFIID riid,
  99     void** ppvObject)
 100 {
 101     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 102
 103     if (IsEqualGUID(riid, &IID_IUnknown)
 104         || IsEqualGUID(riid, &IID_IEnumSTATSTG))
 105     {
 106         IEnumSTATSTG_AddRef(iface);
 107         *ppvObject = &This->IEnumSTATSTG_iface;
 108         return S_OK;
 109     }
 110
 111     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 112     return E_NOINTERFACE;
 113 }
 114
 115 static ULONG WINAPI ITSS_IEnumSTATSTG_AddRef(
 116     IEnumSTATSTG* iface)
 117 {
 118     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 119     return InterlockedIncrement(&This->ref);
 120 }
 121
 122 static ULONG WINAPI ITSS_IEnumSTATSTG_Release(
 123     IEnumSTATSTG* iface)
 124 {
 125     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 126
 127     ULONG ref = InterlockedDecrement(&This->ref);
 128
 129     if (ref == 0)
 130     {
 131         while( This->first )
 132         {
 133             struct enum_info *t = This->first->next;
 134             HeapFree( GetProcessHeap(), 0, This->first );
 135             This->first = t;
 136         }
 137         HeapFree(GetProcessHeap(), 0, This);
 138         ITSS_UnlockModule();
 139     }
 140
 141     return ref;
 142 }
 143
 144 static HRESULT WINAPI ITSS_IEnumSTATSTG_Next(
 145         IEnumSTATSTG* iface,
 146         ULONG celt,
 147         STATSTG* rgelt,
 148         ULONG* pceltFetched)
 149 {
 150     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 151     DWORD len, n;
 152     struct enum_info *cur;
 153
 154     TRACE("%p %u %p %p\n", This, celt, rgelt, pceltFetched );
 155
 156     cur = This->current;
 157     n = 0;
 158     while( (n<celt) && cur)
 159     {
 160         WCHAR *str;
 161
 162         memset( rgelt, 0, sizeof *rgelt );
 163
 164         /* copy the name */
 165         str = cur->ui.path;
 166         if( *str == '/' )
 167             str++;
 168         len = lstrlenW( str ) + 1;
 169         rgelt->pwcsName = CoTaskMemAlloc( len*sizeof(WCHAR) );
 170         lstrcpyW( rgelt->pwcsName, str );
 171
 172         /* determine the type */
 173         if( rgelt->pwcsName[len-2] == '/' )
 174         {
 175             rgelt->pwcsName[len-2] = 0;
 176             rgelt->type = STGTY_STORAGE;
 177         }
 178         else
 179             rgelt->type = STGTY_STREAM;
 180
 181         /* copy the size */
 182         rgelt->cbSize.QuadPart = cur->ui.length;
 183
 184         /* advance to the next item if it exists */
 185         n++;
 186         cur = cur->next;
 187     }
 188
 189     This->current = cur;
 190     *pceltFetched = n;
 191
 192     if( n < celt )
 193         return S_FALSE;
 194
 195     return S_OK;
 196 }
 197
 198 static HRESULT WINAPI ITSS_IEnumSTATSTG_Skip(
 199         IEnumSTATSTG* iface,
 200         ULONG celt)
 201 {
 202     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 203     DWORD n;
 204     struct enum_info *cur;
 205
 206     TRACE("%p %u\n", This, celt );
 207
 208     cur = This->current;
 209     n = 0;
 210     while( (n<celt) && cur)
 211     {
 212         n++;
 213         cur = cur->next;
 214     }
 215     This->current = cur;
 216
 217     if( n < celt )
 218         return S_FALSE;
 219
 220     return S_OK;
 221 }
 222
 223 static HRESULT WINAPI ITSS_IEnumSTATSTG_Reset(
 224         IEnumSTATSTG* iface)
 225 {
 226     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 227
 228     TRACE("%p\n", This );
 229
 230     This->current = This->first;
 231
 232     return S_OK;
 233 }
 234
 235 static HRESULT WINAPI ITSS_IEnumSTATSTG_Clone(
 236         IEnumSTATSTG* iface,
 237         IEnumSTATSTG** ppenum)
 238 {
 239     FIXME("\n");
 240     return E_NOTIMPL;
 241 }
 242
 243 static const IEnumSTATSTGVtbl IEnumSTATSTG_vtbl =
 244 {
 245     ITSS_IEnumSTATSTG_QueryInterface,
 246     ITSS_IEnumSTATSTG_AddRef,
 247     ITSS_IEnumSTATSTG_Release,
 248     ITSS_IEnumSTATSTG_Next,
 249     ITSS_IEnumSTATSTG_Skip,
 250     ITSS_IEnumSTATSTG_Reset,
 251     ITSS_IEnumSTATSTG_Clone
 252 };
 253
 254 static IEnumSTATSTG_Impl *ITSS_create_enum( void )
 255 {
 256     IEnumSTATSTG_Impl *stgenum;
 257
 258     stgenum = HeapAlloc( GetProcessHeap(), 0, sizeof (IEnumSTATSTG_Impl) );
 259     stgenum->IEnumSTATSTG_iface.lpVtbl = &IEnumSTATSTG_vtbl;
 260     stgenum->ref = 1;
 261     stgenum->first = NULL;
 262     stgenum->last = NULL;
 263     stgenum->current = NULL;
 264
 265     ITSS_LockModule();
 266     TRACE(" -> %p\n", stgenum );
 267
 268     return stgenum;
 269 }
 270
 271 /************************************************************************/
 272
 273 static HRESULT WINAPI ITSS_IStorageImpl_QueryInterface(
 274     IStorage* iface,
 275     REFIID riid,
 276     void** ppvObject)
 277 {
 278     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 279
 280     if (IsEqualGUID(riid, &IID_IUnknown)
 281         || IsEqualGUID(riid, &IID_IStorage))
 282     {
 283         IStorage_AddRef(iface);
 284         *ppvObject = &This->IStorage_iface;
 285         return S_OK;
 286     }
 287
 288     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 289     return E_NOINTERFACE;
 290 }
 291
 292 static ULONG WINAPI ITSS_IStorageImpl_AddRef(
 293     IStorage* iface)
 294 {
 295     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 296     return InterlockedIncrement(&This->ref);
 297 }
 298
 299 static ULONG WINAPI ITSS_IStorageImpl_Release(
 300     IStorage* iface)
 301 {
 302     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 303
 304     ULONG ref = InterlockedDecrement(&This->ref);
 305
 306     if (ref == 0)
 307     {
 308         chm_close(This->chmfile);
 309         HeapFree(GetProcessHeap(), 0, This);
 310         ITSS_UnlockModule();
 311     }
 312
 313     return ref;
 314 }
 315
 316 static HRESULT WINAPI ITSS_IStorageImpl_CreateStream(
 317     IStorage* iface,
 318     LPCOLESTR pwcsName,
 319     DWORD grfMode,
 320     DWORD reserved1,
 321     DWORD reserved2,
 322     IStream** ppstm)
 323 {
 324     FIXME("\n");
 325     return E_NOTIMPL;
 326 }
 327
 328 static HRESULT WINAPI ITSS_IStorageImpl_OpenStream(
 329     IStorage* iface,
 330     LPCOLESTR pwcsName,
 331     void* reserved1,
 332     DWORD grfMode,
 333     DWORD reserved2,
 334     IStream** ppstm)
 335 {
 336     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 337     IStream_Impl *stm;
 338     DWORD len;
 339     struct chmUnitInfo ui;
 340     int r;
 341     WCHAR *path, *p;
 342
 343     TRACE("%p %s %p %u %u %p\n", This, debugstr_w(pwcsName),
 344           reserved1, grfMode, reserved2, ppstm );
 345
 346     len = lstrlenW( This->dir ) + lstrlenW( pwcsName ) + 1;
 347     path = HeapAlloc( GetProcessHeap(), 0, len*sizeof(WCHAR) );
 348     lstrcpyW( path, This->dir );
 349
 350     if( pwcsName[0] == '/' || pwcsName[0] == '\\' )
 351     {
 352         p = &path[lstrlenW( path ) - 1];
 353         while( ( path <= p ) && ( *p == '/' ) )
 354             *p-- = 0;
 355     }
 356     lstrcatW( path, pwcsName );
 357
 358     for(p=path; *p; p++) {
 359         if(*p == '\\')
 360             *p = '/';
 361     }
 362
 363     if(*--p == '/')
 364         *p = 0;
 365
 366     TRACE("Resolving %s\n", debugstr_w(path));
 367
 368     r = chm_resolve_object(This->chmfile, path, &ui);
 369     HeapFree( GetProcessHeap(), 0, path );
 370
 371     if( r != CHM_RESOLVE_SUCCESS ) {
 372         WARN("Could not resolve object\n");
 373         return STG_E_FILENOTFOUND;
 374     }
 375
 376     stm = ITSS_create_stream( This, &ui );
 377     if( !stm )
 378         return E_FAIL;
 379
 380     *ppstm = &stm->IStream_iface;
 381
 382     return S_OK;
 383 }
 384
 385 static HRESULT WINAPI ITSS_IStorageImpl_CreateStorage(
 386     IStorage* iface,
 387     LPCOLESTR pwcsName,
 388     DWORD grfMode,
 389     DWORD dwStgFmt,
 390     DWORD reserved2,
 391     IStorage** ppstg)
 392 {
 393     FIXME("\n");
 394     return E_NOTIMPL;
 395 }
 396
 397 static HRESULT WINAPI ITSS_IStorageImpl_OpenStorage(
 398     IStorage* iface,
 399     LPCOLESTR pwcsName,
 400     IStorage* pstgPriority,
 401     DWORD grfMode,
 402     SNB snbExclude,
 403     DWORD reserved,
 404     IStorage** ppstg)
 405 {
 406     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 407     struct chmFile *chmfile;
 408     WCHAR *path, *p;
 409     DWORD len;
 410
 411     TRACE("%p %s %p %u %p %u %p\n", This, debugstr_w(pwcsName),
 412           pstgPriority, grfMode, snbExclude, reserved, ppstg);
 413
 414     chmfile = chm_dup( This->chmfile );
 415     if( !chmfile )
 416         return E_FAIL;
 417
 418     len = lstrlenW( This->dir ) + lstrlenW( pwcsName ) + 2; /* need room for a terminating slash */
 419     path = HeapAlloc( GetProcessHeap(), 0, len*sizeof(WCHAR) );
 420     lstrcpyW( path, This->dir );
 421
 422     if( pwcsName[0] == '/' || pwcsName[0] == '\\' )
 423     {
 424         p = &path[lstrlenW( path ) - 1];
 425         while( ( path <= p ) && ( *p == '/' ) )
 426             *p-- = 0;
 427     }
 428     lstrcatW( path, pwcsName );
 429
 430     for(p=path; *p; p++) {
 431         if(*p == '\\')
 432             *p = '/';
 433     }
 434
 435     /* add a terminating slash if one does not already exist */
 436     if(*(p-1) != '/')
 437     {
 438         *p++ = '/';
 439         *p = 0;
 440     }
 441
 442     TRACE("Resolving %s\n", debugstr_w(path));
 443
 444     return ITSS_create_chm_storage(chmfile, path, ppstg);
 445 }
 446
 447 static HRESULT WINAPI ITSS_IStorageImpl_CopyTo(
 448     IStorage* iface,
 449     DWORD ciidExclude,
 450     const IID* rgiidExclude,
 451     SNB snbExclude,
 452     IStorage* pstgDest)
 453 {
 454     FIXME("\n");
 455     return E_NOTIMPL;
 456 }
 457
 458 static HRESULT WINAPI ITSS_IStorageImpl_MoveElementTo(
 459     IStorage* iface,
 460     LPCOLESTR pwcsName,
 461     IStorage* pstgDest,
 462     LPCOLESTR pwcsNewName,
 463     DWORD grfFlags)
 464 {
 465     FIXME("\n");
 466     return E_NOTIMPL;
 467 }
 468
 469 static HRESULT WINAPI ITSS_IStorageImpl_Commit(
 470     IStorage* iface,
 471     DWORD grfCommitFlags)
 472 {
 473     FIXME("\n");
 474     return E_NOTIMPL;
 475 }
 476
 477 static HRESULT WINAPI ITSS_IStorageImpl_Revert(
 478     IStorage* iface)
 479 {
 480     FIXME("\n");
 481     return E_NOTIMPL;
 482 }
 483
 484 static int ITSS_chm_enumerator(
 485     struct chmFile *h,
 486     struct chmUnitInfo *ui,
 487     void *context)
 488 {
 489     struct enum_info *info;
 490     IEnumSTATSTG_Impl* stgenum = context;
 491
 492     TRACE("adding %s to enumeration\n", debugstr_w(ui->path) );
 493
 494     info = HeapAlloc( GetProcessHeap(), 0, sizeof (struct enum_info) );
 495     info->ui = *ui;
 496
 497     info->next = NULL;
 498     info->prev = stgenum->last;
 499     if( stgenum->last )
 500         stgenum->last->next = info;
 501     else
 502         stgenum->first = info;
 503     stgenum->last = info;
 504
 505     return CHM_ENUMERATOR_CONTINUE;
 506 }
 507
 508 static HRESULT WINAPI ITSS_IStorageImpl_EnumElements(
 509     IStorage* iface,
 510     DWORD reserved1,
 511     void* reserved2,
 512     DWORD reserved3,
 513     IEnumSTATSTG** ppenum)
 514 {
 515     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 516     IEnumSTATSTG_Impl* stgenum;
 517
 518     TRACE("%p %d %p %d %p\n", This, reserved1, reserved2, reserved3, ppenum );
 519
 520     stgenum = ITSS_create_enum();
 521     if( !stgenum )
 522         return E_FAIL;
 523
 524     chm_enumerate_dir(This->chmfile,
 525                   This->dir,
 526                   CHM_ENUMERATE_ALL,
 527                   ITSS_chm_enumerator,
 528                   stgenum );
 529
 530     stgenum->current = stgenum->first;
 531
 532     *ppenum = &stgenum->IEnumSTATSTG_iface;
 533
 534     return S_OK;
 535 }
 536
 537 static HRESULT WINAPI ITSS_IStorageImpl_DestroyElement(
 538     IStorage* iface,
 539     LPCOLESTR pwcsName)
 540 {
 541     FIXME("\n");
 542     return E_NOTIMPL;
 543 }
 544
 545 static HRESULT WINAPI ITSS_IStorageImpl_RenameElement(
 546     IStorage* iface,
 547     LPCOLESTR pwcsOldName,
 548     LPCOLESTR pwcsNewName)
 549 {
 550     FIXME("\n");
 551     return E_NOTIMPL;
 552 }
 553
 554 static HRESULT WINAPI ITSS_IStorageImpl_SetElementTimes(
 555     IStorage* iface,
 556     LPCOLESTR pwcsName,
 557     const FILETIME* pctime,
 558     const FILETIME* patime,
 559     const FILETIME* pmtime)
 560 {
 561     FIXME("\n");
 562     return E_NOTIMPL;
 563 }
 564
 565 static HRESULT WINAPI ITSS_IStorageImpl_SetClass(
 566     IStorage* iface,
 567     REFCLSID clsid)
 568 {
 569     FIXME("\n");
 570     return E_NOTIMPL;
 571 }
 572
 573 static HRESULT WINAPI ITSS_IStorageImpl_SetStateBits(
 574     IStorage* iface,
 575     DWORD grfStateBits,
 576     DWORD grfMask)
 577 {
 578     FIXME("\n");
 579     return E_NOTIMPL;
 580 }
 581
 582 static HRESULT WINAPI ITSS_IStorageImpl_Stat(
 583     IStorage* iface,
 584     STATSTG* pstatstg,
 585     DWORD grfStatFlag)
 586 {
 587     FIXME("\n");
 588     return E_NOTIMPL;
 589 }
 590
 591 static const IStorageVtbl ITSS_IStorageImpl_Vtbl =
 592 {
 593     ITSS_IStorageImpl_QueryInterface,
 594     ITSS_IStorageImpl_AddRef,
 595     ITSS_IStorageImpl_Release,
 596     ITSS_IStorageImpl_CreateStream,
 597     ITSS_IStorageImpl_OpenStream,
 598     ITSS_IStorageImpl_CreateStorage,
 599     ITSS_IStorageImpl_OpenStorage,
 600     ITSS_IStorageImpl_CopyTo,
 601     ITSS_IStorageImpl_MoveElementTo,
 602     ITSS_IStorageImpl_Commit,
 603     ITSS_IStorageImpl_Revert,
 604     ITSS_IStorageImpl_EnumElements,
 605     ITSS_IStorageImpl_DestroyElement,
 606     ITSS_IStorageImpl_RenameElement,
 607     ITSS_IStorageImpl_SetElementTimes,
 608     ITSS_IStorageImpl_SetClass,
 609     ITSS_IStorageImpl_SetStateBits,
 610     ITSS_IStorageImpl_Stat,
 611 };
 612
 613 static HRESULT ITSS_create_chm_storage(
 614       struct chmFile *chmfile, const WCHAR *dir, IStorage** ppstgOpen )
 615 {
 616     ITSS_IStorageImpl *stg;
 617
 618     TRACE("%p %s\n", chmfile, debugstr_w( dir ) );
 619
 620     stg = HeapAlloc( GetProcessHeap(), 0,
 621                      FIELD_OFFSET( ITSS_IStorageImpl, dir[lstrlenW( dir ) + 1] ));
 622     stg->IStorage_iface.lpVtbl = &ITSS_IStorageImpl_Vtbl;
 623     stg->ref = 1;
 624     stg->chmfile = chmfile;
 625     lstrcpyW( stg->dir, dir );
 626
 627     *ppstgOpen = &stg->IStorage_iface;
 628
 629     ITSS_LockModule();
 630     return S_OK;
 631 }
 632
 633 HRESULT ITSS_StgOpenStorage(
 634     const WCHAR* pwcsName,
 635     IStorage* pstgPriority,
 636     DWORD grfMode,
 637     SNB snbExclude,
 638     DWORD reserved,
 639     IStorage** ppstgOpen)
 640 {
 641     struct chmFile *chmfile;
 642     static const WCHAR szRoot[] = { '/', 0 };
 643
 644     TRACE("%s\n", debugstr_w(pwcsName) );
 645
 646     chmfile = chm_openW( pwcsName );
 647     if( !chmfile )
 648         return E_FAIL;
 649
 650     return ITSS_create_chm_storage( chmfile, szRoot, ppstgOpen );
 651 }
 652
 653 /************************************************************************/
 654
 655 static HRESULT WINAPI ITSS_IStream_QueryInterface(
 656     IStream* iface,
 657     REFIID riid,
 658     void** ppvObject)
 659 {
 660     IStream_Impl *This = impl_from_IStream(iface);
 661
 662     if (IsEqualGUID(riid, &IID_IUnknown)
 663         || IsEqualGUID(riid, &IID_ISequentialStream)
 664         || IsEqualGUID(riid, &IID_IStream))
 665     {
 666         IStream_AddRef(iface);
 667         *ppvObject = &This->IStream_iface;
 668         return S_OK;
 669     }
 670
 671     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 672     return E_NOINTERFACE;
 673 }
 674
 675 static ULONG WINAPI ITSS_IStream_AddRef(
 676     IStream* iface)
 677 {
 678     IStream_Impl *This = impl_from_IStream(iface);
 679     return InterlockedIncrement(&This->ref);
 680 }
 681
 682 static ULONG WINAPI ITSS_IStream_Release(
 683     IStream* iface)
 684 {
 685     IStream_Impl *This = impl_from_IStream(iface);
 686
 687     ULONG ref = InterlockedDecrement(&This->ref);
 688
 689     if (ref == 0)
 690     {
 691         IStorage_Release( &This->stg->IStorage_iface );
 692         HeapFree(GetProcessHeap(), 0, This);
 693         ITSS_UnlockModule();
 694     }
 695
 696     return ref;
 697 }
 698
 699 static HRESULT WINAPI ITSS_IStream_Read(
 700         IStream* iface,
 701         void* pv,
 702         ULONG cb,
 703         ULONG* pcbRead)
 704 {
 705     IStream_Impl *This = impl_from_IStream(iface);
 706     ULONG count;
 707
 708     TRACE("%p %p %u %p\n", This, pv, cb, pcbRead);
 709
 710     count = chm_retrieve_object(This->stg->chmfile,
 711                           &This->ui, pv, This->addr, cb);
 712     This->addr += count;
 713     if( pcbRead )
 714         *pcbRead = count;
 715
 716     return count ? S_OK : S_FALSE;
 717 }
 718
 719 static HRESULT WINAPI ITSS_IStream_Write(
 720         IStream* iface,
 721         const void* pv,
 722         ULONG cb,
 723         ULONG* pcbWritten)
 724 {
 725     FIXME("\n");
 726     return E_NOTIMPL;
 727 }
 728
 729 static HRESULT WINAPI ITSS_IStream_Seek(
 730         IStream* iface,
 731         LARGE_INTEGER dlibMove,
 732         DWORD dwOrigin,
 733         ULARGE_INTEGER* plibNewPosition)
 734 {
 735     IStream_Impl *This = impl_from_IStream(iface);
 736     LONGLONG newpos;
 737
 738     TRACE("%p %s %u %p\n", This,
 739           wine_dbgstr_longlong( dlibMove.QuadPart ), dwOrigin, plibNewPosition );
 740
 741     newpos = This->addr;
 742     switch( dwOrigin )
 743     {
 744     case STREAM_SEEK_CUR:
 745         newpos = This->addr + dlibMove.QuadPart;
 746         break;
 747     case STREAM_SEEK_SET:
 748         newpos = dlibMove.QuadPart;
 749         break;
 750     case STREAM_SEEK_END:
 751         newpos = This->ui.length + dlibMove.QuadPart;
 752         break;
 753     }
 754
 755     if( ( newpos < 0 ) || ( newpos > This->ui.length ) )
 756         return STG_E_INVALIDPOINTER;
 757
 758     This->addr = newpos;
 759     if( plibNewPosition )
 760         plibNewPosition->QuadPart = This->addr;
 761
 762     return S_OK;
 763 }
 764
 765 static HRESULT WINAPI ITSS_IStream_SetSize(
 766         IStream* iface,
 767         ULARGE_INTEGER libNewSize)
 768 {
 769     FIXME("\n");
 770     return E_NOTIMPL;
 771 }
 772
 773 static HRESULT WINAPI ITSS_IStream_CopyTo(
 774         IStream* iface,
 775         IStream* pstm,
 776         ULARGE_INTEGER cb,
 777         ULARGE_INTEGER* pcbRead,
 778         ULARGE_INTEGER* pcbWritten)
 779 {
 780     FIXME("\n");
 781     return E_NOTIMPL;
 782 }
 783
 784 static HRESULT WINAPI ITSS_IStream_Commit(
 785         IStream* iface,
 786         DWORD grfCommitFlags)
 787 {
 788     FIXME("\n");
 789     return E_NOTIMPL;
 790 }
 791
 792 static HRESULT WINAPI ITSS_IStream_Revert(
 793         IStream* iface)
 794 {
 795     FIXME("\n");
 796     return E_NOTIMPL;
 797 }
 798
 799 static HRESULT WINAPI ITSS_IStream_LockRegion(
 800         IStream* iface,
 801         ULARGE_INTEGER libOffset,
 802         ULARGE_INTEGER cb,
 803         DWORD dwLockType)
 804 {
 805     FIXME("\n");
 806     return E_NOTIMPL;
 807 }
 808
 809 static HRESULT WINAPI ITSS_IStream_UnlockRegion(
 810         IStream* iface,
 811         ULARGE_INTEGER libOffset,
 812         ULARGE_INTEGER cb,
 813         DWORD dwLockType)
 814 {
 815     FIXME("\n");
 816     return E_NOTIMPL;
 817 }
 818
 819 static HRESULT WINAPI ITSS_IStream_Stat(
 820         IStream* iface,
 821         STATSTG* pstatstg,
 822         DWORD grfStatFlag)
 823 {
 824     IStream_Impl *This = impl_from_IStream(iface);
 825
 826     TRACE("%p %p %d\n", This, pstatstg, grfStatFlag);
 827
 828     memset( pstatstg, 0, sizeof *pstatstg );
 829     if( !( grfStatFlag & STATFLAG_NONAME ) )
 830     {
 831         FIXME("copy the name\n");
 832     }
 833     pstatstg->type = STGTY_STREAM;
 834     pstatstg->cbSize.QuadPart = This->ui.length;
 835     pstatstg->grfMode = STGM_READ;
 836     pstatstg->clsid = CLSID_ITStorage;
 837
 838     return S_OK;
 839 }
 840
 841 static HRESULT WINAPI ITSS_IStream_Clone(
 842         IStream* iface,
 843         IStream** ppstm)
 844 {
 845     FIXME("\n");
 846     return E_NOTIMPL;
 847 }
 848
 849 static const IStreamVtbl ITSS_IStream_vtbl =
 850 {
 851     ITSS_IStream_QueryInterface,
 852     ITSS_IStream_AddRef,
 853     ITSS_IStream_Release,
 854     ITSS_IStream_Read,
 855     ITSS_IStream_Write,
 856     ITSS_IStream_Seek,
 857     ITSS_IStream_SetSize,
 858     ITSS_IStream_CopyTo,
 859     ITSS_IStream_Commit,
 860     ITSS_IStream_Revert,
 861     ITSS_IStream_LockRegion,
 862     ITSS_IStream_UnlockRegion,
 863     ITSS_IStream_Stat,
 864     ITSS_IStream_Clone,
 865 };
 866
 867 static IStream_Impl *ITSS_create_stream(
 868            ITSS_IStorageImpl *stg, struct chmUnitInfo *ui )
 869 {
 870     IStream_Impl *stm;
 871
 872     stm = HeapAlloc( GetProcessHeap(), 0, sizeof (IStream_Impl) );
 873     stm->IStream_iface.lpVtbl = &ITSS_IStream_vtbl;
 874     stm->ref = 1;
 875     stm->addr = 0;
 876     stm->ui = *ui;
 877     stm->stg = stg;
 878     IStorage_AddRef( &stg->IStorage_iface );
 879
 880     ITSS_LockModule();
 881
 882     TRACE(" -> %p\n", stm );
 883
 884     return stm;
 885 }