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 #include "config.h"
  24
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27
  28 #define COBJMACROS
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "winuser.h"
  33 #include "ole2.h"
  34
  35 #include "chm_lib.h"
  36 #include "itsstor.h"
  37
  38 #include "wine/itss.h"
  39 #include "wine/unicode.h"
  40 #include "wine/debug.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(itss);
  43
  44 /************************************************************************/
  45
  46 typedef struct _ITSS_IStorageImpl
  47 {
  48     IStorage IStorage_iface;
  49     LONG ref;
  50     struct chmFile *chmfile;
  51     WCHAR dir[1];
  52 } ITSS_IStorageImpl;
  53
  54 struct enum_info
  55 {
  56     struct enum_info *next, *prev;
  57     struct chmUnitInfo ui;
  58 };
  59
  60 typedef struct _IEnumSTATSTG_Impl
  61 {
  62     IEnumSTATSTG IEnumSTATSTG_iface;
  63     LONG ref;
  64     struct enum_info *first, *last, *current;
  65 } IEnumSTATSTG_Impl;
  66
  67 typedef struct _IStream_Impl
  68 {
  69     IStream IStream_iface;
  70     LONG ref;
  71     ITSS_IStorageImpl *stg;
  72     ULONGLONG addr;
  73     struct chmUnitInfo ui;
  74 } IStream_Impl;
  75
  76 static inline ITSS_IStorageImpl *impl_from_IStorage(IStorage *iface)
  77 {
  78     return CONTAINING_RECORD(iface, ITSS_IStorageImpl, IStorage_iface);
  79 }
  80
  81 static inline IEnumSTATSTG_Impl *impl_from_IEnumSTATSTG(IEnumSTATSTG *iface)
  82 {
  83     return CONTAINING_RECORD(iface, IEnumSTATSTG_Impl, IEnumSTATSTG_iface);
  84 }
  85
  86 static inline IStream_Impl *impl_from_IStream(IStream *iface)
  87 {
  88     return CONTAINING_RECORD(iface, IStream_Impl, IStream_iface);
  89 }
  90
  91 static HRESULT ITSS_create_chm_storage(
  92            struct chmFile *chmfile, const WCHAR *dir, IStorage** ppstgOpen );
  93 static IStream_Impl* ITSS_create_stream(
  94            ITSS_IStorageImpl *stg, struct chmUnitInfo *ui );
  95
  96 /************************************************************************/
  97
  98 static HRESULT WINAPI ITSS_IEnumSTATSTG_QueryInterface(
  99     IEnumSTATSTG* iface,
 100     REFIID riid,
 101     void** ppvObject)
 102 {
 103     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 104
 105     if (IsEqualGUID(riid, &IID_IUnknown)
 106         || IsEqualGUID(riid, &IID_IEnumSTATSTG))
 107     {
 108         IEnumSTATSTG_AddRef(iface);
 109         *ppvObject = This;
 110         return S_OK;
 111     }
 112
 113     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 114     return E_NOINTERFACE;
 115 }
 116
 117 static ULONG WINAPI ITSS_IEnumSTATSTG_AddRef(
 118     IEnumSTATSTG* iface)
 119 {
 120     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 121     return InterlockedIncrement(&This->ref);
 122 }
 123
 124 static ULONG WINAPI ITSS_IEnumSTATSTG_Release(
 125     IEnumSTATSTG* iface)
 126 {
 127     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 128
 129     ULONG ref = InterlockedDecrement(&This->ref);
 130
 131     if (ref == 0)
 132     {
 133         while( This->first )
 134         {
 135             struct enum_info *t = This->first->next;
 136             HeapFree( GetProcessHeap(), 0, This->first );
 137             This->first = t;
 138         }
 139         HeapFree(GetProcessHeap(), 0, This);
 140         ITSS_UnlockModule();
 141     }
 142
 143     return ref;
 144 }
 145
 146 static HRESULT WINAPI ITSS_IEnumSTATSTG_Next(
 147         IEnumSTATSTG* iface,
 148         ULONG celt,
 149         STATSTG* rgelt,
 150         ULONG* pceltFetched)
 151 {
 152     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 153     DWORD len, n;
 154     struct enum_info *cur;
 155
 156     TRACE("%p %u %p %p\n", This, celt, rgelt, pceltFetched );
 157
 158     cur = This->current;
 159     n = 0;
 160     while( (n<celt) && cur)
 161     {
 162         WCHAR *str;
 163
 164         memset( rgelt, 0, sizeof *rgelt );
 165
 166         /* copy the name */
 167         str = cur->ui.path;
 168         if( *str == '/' )
 169             str++;
 170         len = strlenW( str ) + 1;
 171         rgelt->pwcsName = CoTaskMemAlloc( len*sizeof(WCHAR) );
 172         strcpyW( rgelt->pwcsName, str );
 173
 174         /* determine the type */
 175         if( rgelt->pwcsName[len-2] == '/' )
 176         {
 177             rgelt->pwcsName[len-2] = 0;
 178             rgelt->type = STGTY_STORAGE;
 179         }
 180         else
 181             rgelt->type = STGTY_STREAM;
 182
 183         /* copy the size */
 184         rgelt->cbSize.QuadPart = cur->ui.length;
 185
 186         /* advance to the next item if it exists */
 187         n++;
 188         cur = cur->next;
 189     }
 190
 191     This->current = cur;
 192     *pceltFetched = n;
 193
 194     if( n < celt )
 195         return S_FALSE;
 196
 197     return S_OK;
 198 }
 199
 200 static HRESULT WINAPI ITSS_IEnumSTATSTG_Skip(
 201         IEnumSTATSTG* iface,
 202         ULONG celt)
 203 {
 204     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 205     DWORD n;
 206     struct enum_info *cur;
 207
 208     TRACE("%p %u\n", This, celt );
 209
 210     cur = This->current;
 211     n = 0;
 212     while( (n<celt) && cur)
 213     {
 214         n++;
 215         cur = cur->next;
 216     }
 217     This->current = cur;
 218
 219     if( n < celt )
 220         return S_FALSE;
 221
 222     return S_OK;
 223 }
 224
 225 static HRESULT WINAPI ITSS_IEnumSTATSTG_Reset(
 226         IEnumSTATSTG* iface)
 227 {
 228     IEnumSTATSTG_Impl *This = impl_from_IEnumSTATSTG(iface);
 229
 230     TRACE("%p\n", This );
 231
 232     This->current = This->first;
 233
 234     return S_OK;
 235 }
 236
 237 static HRESULT WINAPI ITSS_IEnumSTATSTG_Clone(
 238         IEnumSTATSTG* iface,
 239         IEnumSTATSTG** ppenum)
 240 {
 241     FIXME("\n");
 242     return E_NOTIMPL;
 243 }
 244
 245 static const IEnumSTATSTGVtbl IEnumSTATSTG_vtbl =
 246 {
 247     ITSS_IEnumSTATSTG_QueryInterface,
 248     ITSS_IEnumSTATSTG_AddRef,
 249     ITSS_IEnumSTATSTG_Release,
 250     ITSS_IEnumSTATSTG_Next,
 251     ITSS_IEnumSTATSTG_Skip,
 252     ITSS_IEnumSTATSTG_Reset,
 253     ITSS_IEnumSTATSTG_Clone
 254 };
 255
 256 static IEnumSTATSTG_Impl *ITSS_create_enum( void )
 257 {
 258     IEnumSTATSTG_Impl *stgenum;
 259
 260     stgenum = HeapAlloc( GetProcessHeap(), 0, sizeof (IEnumSTATSTG_Impl) );
 261     stgenum->IEnumSTATSTG_iface.lpVtbl = &IEnumSTATSTG_vtbl;
 262     stgenum->ref = 1;
 263     stgenum->first = NULL;
 264     stgenum->last = NULL;
 265     stgenum->current = NULL;
 266
 267     ITSS_LockModule();
 268     TRACE(" -> %p\n", stgenum );
 269
 270     return stgenum;
 271 }
 272
 273 /************************************************************************/
 274
 275 static HRESULT WINAPI ITSS_IStorageImpl_QueryInterface(
 276     IStorage* iface,
 277     REFIID riid,
 278     void** ppvObject)
 279 {
 280     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 281
 282     if (IsEqualGUID(riid, &IID_IUnknown)
 283         || IsEqualGUID(riid, &IID_IStorage))
 284     {
 285         IStorage_AddRef(iface);
 286         *ppvObject = This;
 287         return S_OK;
 288     }
 289
 290     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 291     return E_NOINTERFACE;
 292 }
 293
 294 static ULONG WINAPI ITSS_IStorageImpl_AddRef(
 295     IStorage* iface)
 296 {
 297     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 298     return InterlockedIncrement(&This->ref);
 299 }
 300
 301 static ULONG WINAPI ITSS_IStorageImpl_Release(
 302     IStorage* iface)
 303 {
 304     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 305
 306     ULONG ref = InterlockedDecrement(&This->ref);
 307
 308     if (ref == 0)
 309     {
 310         chm_close(This->chmfile);
 311         HeapFree(GetProcessHeap(), 0, This);
 312         ITSS_UnlockModule();
 313     }
 314
 315     return ref;
 316 }
 317
 318 static HRESULT WINAPI ITSS_IStorageImpl_CreateStream(
 319     IStorage* iface,
 320     LPCOLESTR pwcsName,
 321     DWORD grfMode,
 322     DWORD reserved1,
 323     DWORD reserved2,
 324     IStream** ppstm)
 325 {
 326     FIXME("\n");
 327     return E_NOTIMPL;
 328 }
 329
 330 static HRESULT WINAPI ITSS_IStorageImpl_OpenStream(
 331     IStorage* iface,
 332     LPCOLESTR pwcsName,
 333     void* reserved1,
 334     DWORD grfMode,
 335     DWORD reserved2,
 336     IStream** ppstm)
 337 {
 338     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 339     IStream_Impl *stm;
 340     DWORD len;
 341     struct chmUnitInfo ui;
 342     int r;
 343     WCHAR *path, *p;
 344
 345     TRACE("%p %s %p %u %u %p\n", This, debugstr_w(pwcsName),
 346           reserved1, grfMode, reserved2, ppstm );
 347
 348     len = strlenW( This->dir ) + strlenW( pwcsName ) + 1;
 349     path = HeapAlloc( GetProcessHeap(), 0, len*sizeof(WCHAR) );
 350     strcpyW( path, This->dir );
 351
 352     if( pwcsName[0] == '/' || pwcsName[0] == '\\' )
 353     {
 354         p = &path[strlenW( path ) - 1];
 355         while( ( path <= p ) && ( *p == '/' ) )
 356             *p-- = 0;
 357     }
 358     strcatW( path, pwcsName );
 359
 360     for(p=path; *p; p++) {
 361         if(*p == '\\')
 362             *p = '/';
 363     }
 364
 365     if(*--p == '/')
 366         *p = 0;
 367
 368     TRACE("Resolving %s\n", debugstr_w(path));
 369
 370     r = chm_resolve_object(This->chmfile, path, &ui);
 371     HeapFree( GetProcessHeap(), 0, path );
 372
 373     if( r != CHM_RESOLVE_SUCCESS ) {
 374         WARN("Could not resolve object\n");
 375         return STG_E_FILENOTFOUND;
 376     }
 377
 378     stm = ITSS_create_stream( This, &ui );
 379     if( !stm )
 380         return E_FAIL;
 381
 382     *ppstm = &stm->IStream_iface;
 383
 384     return S_OK;
 385 }
 386
 387 static HRESULT WINAPI ITSS_IStorageImpl_CreateStorage(
 388     IStorage* iface,
 389     LPCOLESTR pwcsName,
 390     DWORD grfMode,
 391     DWORD dwStgFmt,
 392     DWORD reserved2,
 393     IStorage** ppstg)
 394 {
 395     FIXME("\n");
 396     return E_NOTIMPL;
 397 }
 398
 399 static HRESULT WINAPI ITSS_IStorageImpl_OpenStorage(
 400     IStorage* iface,
 401     LPCOLESTR pwcsName,
 402     IStorage* pstgPriority,
 403     DWORD grfMode,
 404     SNB snbExclude,
 405     DWORD reserved,
 406     IStorage** ppstg)
 407 {
 408     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 409     struct chmFile *chmfile;
 410     WCHAR *path, *p;
 411     DWORD len;
 412
 413     TRACE("%p %s %p %u %p %u %p\n", This, debugstr_w(pwcsName),
 414           pstgPriority, grfMode, snbExclude, reserved, ppstg);
 415
 416     chmfile = chm_dup( This->chmfile );
 417     if( !chmfile )
 418         return E_FAIL;
 419
 420     len = strlenW( This->dir ) + strlenW( pwcsName ) + 2; /* need room for a terminating slash */
 421     path = HeapAlloc( GetProcessHeap(), 0, len*sizeof(WCHAR) );
 422     strcpyW( path, This->dir );
 423
 424     if( pwcsName[0] == '/' || pwcsName[0] == '\\' )
 425     {
 426         p = &path[strlenW( path ) - 1];
 427         while( ( path <= p ) && ( *p == '/' ) )
 428             *p-- = 0;
 429     }
 430     strcatW( path, pwcsName );
 431
 432     for(p=path; *p; p++) {
 433         if(*p == '\\')
 434             *p = '/';
 435     }
 436
 437     /* add a terminating slash if one does not already exist */
 438     if(*(p-1) != '/')
 439     {
 440         *p++ = '/';
 441         *p = 0;
 442     }
 443
 444     TRACE("Resolving %s\n", debugstr_w(path));
 445
 446     return ITSS_create_chm_storage(chmfile, path, ppstg);
 447 }
 448
 449 static HRESULT WINAPI ITSS_IStorageImpl_CopyTo(
 450     IStorage* iface,
 451     DWORD ciidExclude,
 452     const IID* rgiidExclude,
 453     SNB snbExclude,
 454     IStorage* pstgDest)
 455 {
 456     FIXME("\n");
 457     return E_NOTIMPL;
 458 }
 459
 460 static HRESULT WINAPI ITSS_IStorageImpl_MoveElementTo(
 461     IStorage* iface,
 462     LPCOLESTR pwcsName,
 463     IStorage* pstgDest,
 464     LPCOLESTR pwcsNewName,
 465     DWORD grfFlags)
 466 {
 467     FIXME("\n");
 468     return E_NOTIMPL;
 469 }
 470
 471 static HRESULT WINAPI ITSS_IStorageImpl_Commit(
 472     IStorage* iface,
 473     DWORD grfCommitFlags)
 474 {
 475     FIXME("\n");
 476     return E_NOTIMPL;
 477 }
 478
 479 static HRESULT WINAPI ITSS_IStorageImpl_Revert(
 480     IStorage* iface)
 481 {
 482     FIXME("\n");
 483     return E_NOTIMPL;
 484 }
 485
 486 static int ITSS_chm_enumerator(
 487     struct chmFile *h,
 488     struct chmUnitInfo *ui,
 489     void *context)
 490 {
 491     struct enum_info *info;
 492     IEnumSTATSTG_Impl* stgenum = context;
 493
 494     TRACE("adding %s to enumeration\n", debugstr_w(ui->path) );
 495
 496     info = HeapAlloc( GetProcessHeap(), 0, sizeof (struct enum_info) );
 497     info->ui = *ui;
 498
 499     info->next = NULL;
 500     info->prev = stgenum->last;
 501     if( stgenum->last )
 502         stgenum->last->next = info;
 503     else
 504         stgenum->first = info;
 505     stgenum->last = info;
 506
 507     return CHM_ENUMERATOR_CONTINUE;
 508 }
 509
 510 static HRESULT WINAPI ITSS_IStorageImpl_EnumElements(
 511     IStorage* iface,
 512     DWORD reserved1,
 513     void* reserved2,
 514     DWORD reserved3,
 515     IEnumSTATSTG** ppenum)
 516 {
 517     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 518     IEnumSTATSTG_Impl* stgenum;
 519
 520     TRACE("%p %d %p %d %p\n", This, reserved1, reserved2, reserved3, ppenum );
 521
 522     stgenum = ITSS_create_enum();
 523     if( !stgenum )
 524         return E_FAIL;
 525
 526     chm_enumerate_dir(This->chmfile,
 527                   This->dir,
 528                   CHM_ENUMERATE_ALL,
 529                   ITSS_chm_enumerator,
 530                   stgenum );
 531
 532     stgenum->current = stgenum->first;
 533
 534     *ppenum = &stgenum->IEnumSTATSTG_iface;
 535
 536     return S_OK;
 537 }
 538
 539 static HRESULT WINAPI ITSS_IStorageImpl_DestroyElement(
 540     IStorage* iface,
 541     LPCOLESTR pwcsName)
 542 {
 543     FIXME("\n");
 544     return E_NOTIMPL;
 545 }
 546
 547 static HRESULT WINAPI ITSS_IStorageImpl_RenameElement(
 548     IStorage* iface,
 549     LPCOLESTR pwcsOldName,
 550     LPCOLESTR pwcsNewName)
 551 {
 552     FIXME("\n");
 553     return E_NOTIMPL;
 554 }
 555
 556 static HRESULT WINAPI ITSS_IStorageImpl_SetElementTimes(
 557     IStorage* iface,
 558     LPCOLESTR pwcsName,
 559     const FILETIME* pctime,
 560     const FILETIME* patime,
 561     const FILETIME* pmtime)
 562 {
 563     FIXME("\n");
 564     return E_NOTIMPL;
 565 }
 566
 567 static HRESULT WINAPI ITSS_IStorageImpl_SetClass(
 568     IStorage* iface,
 569     REFCLSID clsid)
 570 {
 571     FIXME("\n");
 572     return E_NOTIMPL;
 573 }
 574
 575 static HRESULT WINAPI ITSS_IStorageImpl_SetStateBits(
 576     IStorage* iface,
 577     DWORD grfStateBits,
 578     DWORD grfMask)
 579 {
 580     FIXME("\n");
 581     return E_NOTIMPL;
 582 }
 583
 584 static HRESULT WINAPI ITSS_IStorageImpl_Stat(
 585     IStorage* iface,
 586     STATSTG* pstatstg,
 587     DWORD grfStatFlag)
 588 {
 589     FIXME("\n");
 590     return E_NOTIMPL;
 591 }
 592
 593 static const IStorageVtbl ITSS_IStorageImpl_Vtbl =
 594 {
 595     ITSS_IStorageImpl_QueryInterface,
 596     ITSS_IStorageImpl_AddRef,
 597     ITSS_IStorageImpl_Release,
 598     ITSS_IStorageImpl_CreateStream,
 599     ITSS_IStorageImpl_OpenStream,
 600     ITSS_IStorageImpl_CreateStorage,
 601     ITSS_IStorageImpl_OpenStorage,
 602     ITSS_IStorageImpl_CopyTo,
 603     ITSS_IStorageImpl_MoveElementTo,
 604     ITSS_IStorageImpl_Commit,
 605     ITSS_IStorageImpl_Revert,
 606     ITSS_IStorageImpl_EnumElements,
 607     ITSS_IStorageImpl_DestroyElement,
 608     ITSS_IStorageImpl_RenameElement,
 609     ITSS_IStorageImpl_SetElementTimes,
 610     ITSS_IStorageImpl_SetClass,
 611     ITSS_IStorageImpl_SetStateBits,
 612     ITSS_IStorageImpl_Stat,
 613 };
 614
 615 static HRESULT ITSS_create_chm_storage(
 616       struct chmFile *chmfile, const WCHAR *dir, IStorage** ppstgOpen )
 617 {
 618     ITSS_IStorageImpl *stg;
 619     DWORD len;
 620
 621     TRACE("%p %s\n", chmfile, debugstr_w( dir ) );
 622
 623     len = strlenW( dir ) + 1;
 624     stg = HeapAlloc( GetProcessHeap(), 0,
 625                      sizeof (ITSS_IStorageImpl) + len*sizeof(WCHAR) );
 626     stg->IStorage_iface.lpVtbl = &ITSS_IStorageImpl_Vtbl;
 627     stg->ref = 1;
 628     stg->chmfile = chmfile;
 629     strcpyW( stg->dir, dir );
 630
 631     *ppstgOpen = &stg->IStorage_iface;
 632
 633     ITSS_LockModule();
 634     return S_OK;
 635 }
 636
 637 HRESULT ITSS_StgOpenStorage(
 638     const WCHAR* pwcsName,
 639     IStorage* pstgPriority,
 640     DWORD grfMode,
 641     SNB snbExclude,
 642     DWORD reserved,
 643     IStorage** ppstgOpen)
 644 {
 645     struct chmFile *chmfile;
 646     static const WCHAR szRoot[] = { '/', 0 };
 647
 648     TRACE("%s\n", debugstr_w(pwcsName) );
 649
 650     chmfile = chm_openW( pwcsName );
 651     if( !chmfile )
 652         return E_FAIL;
 653
 654     return ITSS_create_chm_storage( chmfile, szRoot, ppstgOpen );
 655 }
 656
 657 /************************************************************************/
 658
 659 static HRESULT WINAPI ITSS_IStream_QueryInterface(
 660     IStream* iface,
 661     REFIID riid,
 662     void** ppvObject)
 663 {
 664     IStream_Impl *This = impl_from_IStream(iface);
 665
 666     if (IsEqualGUID(riid, &IID_IUnknown)
 667         || IsEqualGUID(riid, &IID_ISequentialStream)
 668         || IsEqualGUID(riid, &IID_IStream))
 669     {
 670         IStream_AddRef(iface);
 671         *ppvObject = This;
 672         return S_OK;
 673     }
 674
 675     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 676     return E_NOINTERFACE;
 677 }
 678
 679 static ULONG WINAPI ITSS_IStream_AddRef(
 680     IStream* iface)
 681 {
 682     IStream_Impl *This = impl_from_IStream(iface);
 683     return InterlockedIncrement(&This->ref);
 684 }
 685
 686 static ULONG WINAPI ITSS_IStream_Release(
 687     IStream* iface)
 688 {
 689     IStream_Impl *This = impl_from_IStream(iface);
 690
 691     ULONG ref = InterlockedDecrement(&This->ref);
 692
 693     if (ref == 0)
 694     {
 695         IStorage_Release( &This->stg->IStorage_iface );
 696         HeapFree(GetProcessHeap(), 0, This);
 697         ITSS_UnlockModule();
 698     }
 699
 700     return ref;
 701 }
 702
 703 static HRESULT WINAPI ITSS_IStream_Read(
 704         IStream* iface,
 705         void* pv,
 706         ULONG cb,
 707         ULONG* pcbRead)
 708 {
 709     IStream_Impl *This = impl_from_IStream(iface);
 710     ULONG count;
 711
 712     TRACE("%p %p %u %p\n", This, pv, cb, pcbRead);
 713
 714     count = chm_retrieve_object(This->stg->chmfile,
 715                           &This->ui, pv, This->addr, cb);
 716     This->addr += count;
 717     if( pcbRead )
 718         *pcbRead = count;
 719
 720     return count ? S_OK : S_FALSE;
 721 }
 722
 723 static HRESULT WINAPI ITSS_IStream_Write(
 724         IStream* iface,
 725         const void* pv,
 726         ULONG cb,
 727         ULONG* pcbWritten)
 728 {
 729     FIXME("\n");
 730     return E_NOTIMPL;
 731 }
 732
 733 static HRESULT WINAPI ITSS_IStream_Seek(
 734         IStream* iface,
 735         LARGE_INTEGER dlibMove,
 736         DWORD dwOrigin,
 737         ULARGE_INTEGER* plibNewPosition)
 738 {
 739     IStream_Impl *This = impl_from_IStream(iface);
 740     LONGLONG newpos;
 741
 742     TRACE("%p %s %u %p\n", This,
 743           wine_dbgstr_longlong( dlibMove.QuadPart ), dwOrigin, plibNewPosition );
 744
 745     newpos = This->addr;
 746     switch( dwOrigin )
 747     {
 748     case STREAM_SEEK_CUR:
 749         newpos = This->addr + dlibMove.QuadPart;
 750         break;
 751     case STREAM_SEEK_SET:
 752         newpos = dlibMove.QuadPart;
 753         break;
 754     case STREAM_SEEK_END:
 755         newpos = This->ui.length + dlibMove.QuadPart;
 756         break;
 757     }
 758
 759     if( ( newpos < 0 ) || ( newpos > This->ui.length ) )
 760         return STG_E_INVALIDPOINTER;
 761
 762     This->addr = newpos;
 763     if( plibNewPosition )
 764         plibNewPosition->QuadPart = This->addr;
 765
 766     return S_OK;
 767 }
 768
 769 static HRESULT WINAPI ITSS_IStream_SetSize(
 770         IStream* iface,
 771         ULARGE_INTEGER libNewSize)
 772 {
 773     FIXME("\n");
 774     return E_NOTIMPL;
 775 }
 776
 777 static HRESULT WINAPI ITSS_IStream_CopyTo(
 778         IStream* iface,
 779         IStream* pstm,
 780         ULARGE_INTEGER cb,
 781         ULARGE_INTEGER* pcbRead,
 782         ULARGE_INTEGER* pcbWritten)
 783 {
 784     FIXME("\n");
 785     return E_NOTIMPL;
 786 }
 787
 788 static HRESULT WINAPI ITSS_IStream_Commit(
 789         IStream* iface,
 790         DWORD grfCommitFlags)
 791 {
 792     FIXME("\n");
 793     return E_NOTIMPL;
 794 }
 795
 796 static HRESULT WINAPI ITSS_IStream_Revert(
 797         IStream* iface)
 798 {
 799     FIXME("\n");
 800     return E_NOTIMPL;
 801 }
 802
 803 static HRESULT WINAPI ITSS_IStream_LockRegion(
 804         IStream* iface,
 805         ULARGE_INTEGER libOffset,
 806         ULARGE_INTEGER cb,
 807         DWORD dwLockType)
 808 {
 809     FIXME("\n");
 810     return E_NOTIMPL;
 811 }
 812
 813 static HRESULT WINAPI ITSS_IStream_UnlockRegion(
 814         IStream* iface,
 815         ULARGE_INTEGER libOffset,
 816         ULARGE_INTEGER cb,
 817         DWORD dwLockType)
 818 {
 819     FIXME("\n");
 820     return E_NOTIMPL;
 821 }
 822
 823 static HRESULT WINAPI ITSS_IStream_Stat(
 824         IStream* iface,
 825         STATSTG* pstatstg,
 826         DWORD grfStatFlag)
 827 {
 828     IStream_Impl *This = impl_from_IStream(iface);
 829
 830     TRACE("%p %p %d\n", This, pstatstg, grfStatFlag);
 831
 832     memset( pstatstg, 0, sizeof *pstatstg );
 833     if( !( grfStatFlag & STATFLAG_NONAME ) )
 834     {
 835         FIXME("copy the name\n");
 836     }
 837     pstatstg->type = STGTY_STREAM;
 838     pstatstg->cbSize.QuadPart = This->ui.length;
 839     pstatstg->grfMode = STGM_READ;
 840     pstatstg->clsid = CLSID_ITStorage;
 841
 842     return S_OK;
 843 }
 844
 845 static HRESULT WINAPI ITSS_IStream_Clone(
 846         IStream* iface,
 847         IStream** ppstm)
 848 {
 849     FIXME("\n");
 850     return E_NOTIMPL;
 851 }
 852
 853 static const IStreamVtbl ITSS_IStream_vtbl =
 854 {
 855     ITSS_IStream_QueryInterface,
 856     ITSS_IStream_AddRef,
 857     ITSS_IStream_Release,
 858     ITSS_IStream_Read,
 859     ITSS_IStream_Write,
 860     ITSS_IStream_Seek,
 861     ITSS_IStream_SetSize,
 862     ITSS_IStream_CopyTo,
 863     ITSS_IStream_Commit,
 864     ITSS_IStream_Revert,
 865     ITSS_IStream_LockRegion,
 866     ITSS_IStream_UnlockRegion,
 867     ITSS_IStream_Stat,
 868     ITSS_IStream_Clone,
 869 };
 870
 871 static IStream_Impl *ITSS_create_stream(
 872            ITSS_IStorageImpl *stg, struct chmUnitInfo *ui )
 873 {
 874     IStream_Impl *stm;
 875
 876     stm = HeapAlloc( GetProcessHeap(), 0, sizeof (IStream_Impl) );
 877     stm->IStream_iface.lpVtbl = &ITSS_IStream_vtbl;
 878     stm->ref = 1;
 879     stm->addr = 0;
 880     stm->ui = *ui;
 881     stm->stg = stg;
 882     IStorage_AddRef( &stg->IStorage_iface );
 883
 884     ITSS_LockModule();
 885
 886     TRACE(" -> %p\n", stm );
 887
 888     return stm;
 889 }