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     static const WCHAR szRoot[] = { '/', 0 };
 410     struct chmFile *chmfile;
 411     WCHAR *path, *p;
 412     DWORD len;
 413
 414     TRACE("%p %s %p %u %p %u %p\n", This, debugstr_w(pwcsName),
 415           pstgPriority, grfMode, snbExclude, reserved, ppstg);
 416
 417     chmfile = chm_dup( This->chmfile );
 418     if( !chmfile )
 419         return E_FAIL;
 420
 421     len = strlenW( This->dir ) + strlenW( pwcsName ) + 1;
 422     path = HeapAlloc( GetProcessHeap(), 0, len*sizeof(WCHAR) );
 423     strcpyW( path, This->dir );
 424
 425     if( pwcsName[0] == '/' || pwcsName[0] == '\\' )
 426     {
 427         p = &path[strlenW( path ) - 1];
 428         while( ( path <= p ) && ( *p == '/' ) )
 429             *p-- = 0;
 430     }
 431     strcatW( path, pwcsName );
 432
 433     for(p=path; *p; p++) {
 434         if(*p == '\\')
 435             *p = '/';
 436     }
 437
 438     if(*--p == '/')
 439         *p = 0;
 440
 441     strcatW( path, szRoot );
 442
 443     TRACE("Resolving %s\n", debugstr_w(path));
 444
 445     return ITSS_create_chm_storage(chmfile, path, ppstg);
 446 }
 447
 448 static HRESULT WINAPI ITSS_IStorageImpl_CopyTo(
 449     IStorage* iface,
 450     DWORD ciidExclude,
 451     const IID* rgiidExclude,
 452     SNB snbExclude,
 453     IStorage* pstgDest)
 454 {
 455     FIXME("\n");
 456     return E_NOTIMPL;
 457 }
 458
 459 static HRESULT WINAPI ITSS_IStorageImpl_MoveElementTo(
 460     IStorage* iface,
 461     LPCOLESTR pwcsName,
 462     IStorage* pstgDest,
 463     LPCOLESTR pwcsNewName,
 464     DWORD grfFlags)
 465 {
 466     FIXME("\n");
 467     return E_NOTIMPL;
 468 }
 469
 470 static HRESULT WINAPI ITSS_IStorageImpl_Commit(
 471     IStorage* iface,
 472     DWORD grfCommitFlags)
 473 {
 474     FIXME("\n");
 475     return E_NOTIMPL;
 476 }
 477
 478 static HRESULT WINAPI ITSS_IStorageImpl_Revert(
 479     IStorage* iface)
 480 {
 481     FIXME("\n");
 482     return E_NOTIMPL;
 483 }
 484
 485 static int ITSS_chm_enumerator(
 486     struct chmFile *h,
 487     struct chmUnitInfo *ui,
 488     void *context)
 489 {
 490     struct enum_info *info;
 491     IEnumSTATSTG_Impl* stgenum = context;
 492
 493     TRACE("adding %s to enumeration\n", debugstr_w(ui->path) );
 494
 495     info = HeapAlloc( GetProcessHeap(), 0, sizeof (struct enum_info) );
 496     info->ui = *ui;
 497
 498     info->next = NULL;
 499     info->prev = stgenum->last;
 500     if( stgenum->last )
 501         stgenum->last->next = info;
 502     else
 503         stgenum->first = info;
 504     stgenum->last = info;
 505
 506     return CHM_ENUMERATOR_CONTINUE;
 507 }
 508
 509 static HRESULT WINAPI ITSS_IStorageImpl_EnumElements(
 510     IStorage* iface,
 511     DWORD reserved1,
 512     void* reserved2,
 513     DWORD reserved3,
 514     IEnumSTATSTG** ppenum)
 515 {
 516     ITSS_IStorageImpl *This = impl_from_IStorage(iface);
 517     IEnumSTATSTG_Impl* stgenum;
 518
 519     TRACE("%p %d %p %d %p\n", This, reserved1, reserved2, reserved3, ppenum );
 520
 521     stgenum = ITSS_create_enum();
 522     if( !stgenum )
 523         return E_FAIL;
 524
 525     chm_enumerate_dir(This->chmfile,
 526                   This->dir,
 527                   CHM_ENUMERATE_ALL,
 528                   ITSS_chm_enumerator,
 529                   stgenum );
 530
 531     stgenum->current = stgenum->first;
 532
 533     *ppenum = &stgenum->IEnumSTATSTG_iface;
 534
 535     return S_OK;
 536 }
 537
 538 static HRESULT WINAPI ITSS_IStorageImpl_DestroyElement(
 539     IStorage* iface,
 540     LPCOLESTR pwcsName)
 541 {
 542     FIXME("\n");
 543     return E_NOTIMPL;
 544 }
 545
 546 static HRESULT WINAPI ITSS_IStorageImpl_RenameElement(
 547     IStorage* iface,
 548     LPCOLESTR pwcsOldName,
 549     LPCOLESTR pwcsNewName)
 550 {
 551     FIXME("\n");
 552     return E_NOTIMPL;
 553 }
 554
 555 static HRESULT WINAPI ITSS_IStorageImpl_SetElementTimes(
 556     IStorage* iface,
 557     LPCOLESTR pwcsName,
 558     const FILETIME* pctime,
 559     const FILETIME* patime,
 560     const FILETIME* pmtime)
 561 {
 562     FIXME("\n");
 563     return E_NOTIMPL;
 564 }
 565
 566 static HRESULT WINAPI ITSS_IStorageImpl_SetClass(
 567     IStorage* iface,
 568     REFCLSID clsid)
 569 {
 570     FIXME("\n");
 571     return E_NOTIMPL;
 572 }
 573
 574 static HRESULT WINAPI ITSS_IStorageImpl_SetStateBits(
 575     IStorage* iface,
 576     DWORD grfStateBits,
 577     DWORD grfMask)
 578 {
 579     FIXME("\n");
 580     return E_NOTIMPL;
 581 }
 582
 583 static HRESULT WINAPI ITSS_IStorageImpl_Stat(
 584     IStorage* iface,
 585     STATSTG* pstatstg,
 586     DWORD grfStatFlag)
 587 {
 588     FIXME("\n");
 589     return E_NOTIMPL;
 590 }
 591
 592 static const IStorageVtbl ITSS_IStorageImpl_Vtbl =
 593 {
 594     ITSS_IStorageImpl_QueryInterface,
 595     ITSS_IStorageImpl_AddRef,
 596     ITSS_IStorageImpl_Release,
 597     ITSS_IStorageImpl_CreateStream,
 598     ITSS_IStorageImpl_OpenStream,
 599     ITSS_IStorageImpl_CreateStorage,
 600     ITSS_IStorageImpl_OpenStorage,
 601     ITSS_IStorageImpl_CopyTo,
 602     ITSS_IStorageImpl_MoveElementTo,
 603     ITSS_IStorageImpl_Commit,
 604     ITSS_IStorageImpl_Revert,
 605     ITSS_IStorageImpl_EnumElements,
 606     ITSS_IStorageImpl_DestroyElement,
 607     ITSS_IStorageImpl_RenameElement,
 608     ITSS_IStorageImpl_SetElementTimes,
 609     ITSS_IStorageImpl_SetClass,
 610     ITSS_IStorageImpl_SetStateBits,
 611     ITSS_IStorageImpl_Stat,
 612 };
 613
 614 static HRESULT ITSS_create_chm_storage(
 615       struct chmFile *chmfile, const WCHAR *dir, IStorage** ppstgOpen )
 616 {
 617     ITSS_IStorageImpl *stg;
 618     DWORD len;
 619
 620     TRACE("%p %s\n", chmfile, debugstr_w( dir ) );
 621
 622     len = strlenW( dir ) + 1;
 623     stg = HeapAlloc( GetProcessHeap(), 0,
 624                      sizeof (ITSS_IStorageImpl) + len*sizeof(WCHAR) );
 625     stg->IStorage_iface.lpVtbl = &ITSS_IStorageImpl_Vtbl;
 626     stg->ref = 1;
 627     stg->chmfile = chmfile;
 628     strcpyW( stg->dir, dir );
 629
 630     *ppstgOpen = &stg->IStorage_iface;
 631
 632     ITSS_LockModule();
 633     return S_OK;
 634 }
 635
 636 HRESULT ITSS_StgOpenStorage(
 637     const WCHAR* pwcsName,
 638     IStorage* pstgPriority,
 639     DWORD grfMode,
 640     SNB snbExclude,
 641     DWORD reserved,
 642     IStorage** ppstgOpen)
 643 {
 644     struct chmFile *chmfile;
 645     static const WCHAR szRoot[] = { '/', 0 };
 646
 647     TRACE("%s\n", debugstr_w(pwcsName) );
 648
 649     chmfile = chm_openW( pwcsName );
 650     if( !chmfile )
 651         return E_FAIL;
 652
 653     return ITSS_create_chm_storage( chmfile, szRoot, ppstgOpen );
 654 }
 655
 656 /************************************************************************/
 657
 658 static HRESULT WINAPI ITSS_IStream_QueryInterface(
 659     IStream* iface,
 660     REFIID riid,
 661     void** ppvObject)
 662 {
 663     IStream_Impl *This = impl_from_IStream(iface);
 664
 665     if (IsEqualGUID(riid, &IID_IUnknown)
 666         || IsEqualGUID(riid, &IID_ISequentialStream)
 667         || IsEqualGUID(riid, &IID_IStream))
 668     {
 669         IStream_AddRef(iface);
 670         *ppvObject = This;
 671         return S_OK;
 672     }
 673
 674     WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppvObject);
 675     return E_NOINTERFACE;
 676 }
 677
 678 static ULONG WINAPI ITSS_IStream_AddRef(
 679     IStream* iface)
 680 {
 681     IStream_Impl *This = impl_from_IStream(iface);
 682     return InterlockedIncrement(&This->ref);
 683 }
 684
 685 static ULONG WINAPI ITSS_IStream_Release(
 686     IStream* iface)
 687 {
 688     IStream_Impl *This = impl_from_IStream(iface);
 689
 690     ULONG ref = InterlockedDecrement(&This->ref);
 691
 692     if (ref == 0)
 693     {
 694         IStorage_Release( &This->stg->IStorage_iface );
 695         HeapFree(GetProcessHeap(), 0, This);
 696         ITSS_UnlockModule();
 697     }
 698
 699     return ref;
 700 }
 701
 702 static HRESULT WINAPI ITSS_IStream_Read(
 703         IStream* iface,
 704         void* pv,
 705         ULONG cb,
 706         ULONG* pcbRead)
 707 {
 708     IStream_Impl *This = impl_from_IStream(iface);
 709     ULONG count;
 710
 711     TRACE("%p %p %u %p\n", This, pv, cb, pcbRead);
 712
 713     count = chm_retrieve_object(This->stg->chmfile,
 714                           &This->ui, pv, This->addr, cb);
 715     This->addr += count;
 716     if( pcbRead )
 717         *pcbRead = count;
 718
 719     return count ? S_OK : S_FALSE;
 720 }
 721
 722 static HRESULT WINAPI ITSS_IStream_Write(
 723         IStream* iface,
 724         const void* pv,
 725         ULONG cb,
 726         ULONG* pcbWritten)
 727 {
 728     FIXME("\n");
 729     return E_NOTIMPL;
 730 }
 731
 732 static HRESULT WINAPI ITSS_IStream_Seek(
 733         IStream* iface,
 734         LARGE_INTEGER dlibMove,
 735         DWORD dwOrigin,
 736         ULARGE_INTEGER* plibNewPosition)
 737 {
 738     IStream_Impl *This = impl_from_IStream(iface);
 739     LONGLONG newpos;
 740
 741     TRACE("%p %s %u %p\n", This,
 742           wine_dbgstr_longlong( dlibMove.QuadPart ), dwOrigin, plibNewPosition );
 743
 744     newpos = This->addr;
 745     switch( dwOrigin )
 746     {
 747     case STREAM_SEEK_CUR:
 748         newpos = This->addr + dlibMove.QuadPart;
 749         break;
 750     case STREAM_SEEK_SET:
 751         newpos = dlibMove.QuadPart;
 752         break;
 753     case STREAM_SEEK_END:
 754         newpos = This->ui.length + dlibMove.QuadPart;
 755         break;
 756     }
 757
 758     if( ( newpos < 0 ) || ( newpos > This->ui.length ) )
 759         return STG_E_INVALIDPOINTER;
 760
 761     This->addr = newpos;
 762     if( plibNewPosition )
 763         plibNewPosition->QuadPart = This->addr;
 764
 765     return S_OK;
 766 }
 767
 768 static HRESULT WINAPI ITSS_IStream_SetSize(
 769         IStream* iface,
 770         ULARGE_INTEGER libNewSize)
 771 {
 772     FIXME("\n");
 773     return E_NOTIMPL;
 774 }
 775
 776 static HRESULT WINAPI ITSS_IStream_CopyTo(
 777         IStream* iface,
 778         IStream* pstm,
 779         ULARGE_INTEGER cb,
 780         ULARGE_INTEGER* pcbRead,
 781         ULARGE_INTEGER* pcbWritten)
 782 {
 783     FIXME("\n");
 784     return E_NOTIMPL;
 785 }
 786
 787 static HRESULT WINAPI ITSS_IStream_Commit(
 788         IStream* iface,
 789         DWORD grfCommitFlags)
 790 {
 791     FIXME("\n");
 792     return E_NOTIMPL;
 793 }
 794
 795 static HRESULT WINAPI ITSS_IStream_Revert(
 796         IStream* iface)
 797 {
 798     FIXME("\n");
 799     return E_NOTIMPL;
 800 }
 801
 802 static HRESULT WINAPI ITSS_IStream_LockRegion(
 803         IStream* iface,
 804         ULARGE_INTEGER libOffset,
 805         ULARGE_INTEGER cb,
 806         DWORD dwLockType)
 807 {
 808     FIXME("\n");
 809     return E_NOTIMPL;
 810 }
 811
 812 static HRESULT WINAPI ITSS_IStream_UnlockRegion(
 813         IStream* iface,
 814         ULARGE_INTEGER libOffset,
 815         ULARGE_INTEGER cb,
 816         DWORD dwLockType)
 817 {
 818     FIXME("\n");
 819     return E_NOTIMPL;
 820 }
 821
 822 static HRESULT WINAPI ITSS_IStream_Stat(
 823         IStream* iface,
 824         STATSTG* pstatstg,
 825         DWORD grfStatFlag)
 826 {
 827     IStream_Impl *This = impl_from_IStream(iface);
 828
 829     TRACE("%p %p %d\n", This, pstatstg, grfStatFlag);
 830
 831     memset( pstatstg, 0, sizeof *pstatstg );
 832     if( !( grfStatFlag & STATFLAG_NONAME ) )
 833     {
 834         FIXME("copy the name\n");
 835     }
 836     pstatstg->type = STGTY_STREAM;
 837     pstatstg->cbSize.QuadPart = This->ui.length;
 838     pstatstg->grfMode = STGM_READ;
 839     pstatstg->clsid = CLSID_ITStorage;
 840
 841     return S_OK;
 842 }
 843
 844 static HRESULT WINAPI ITSS_IStream_Clone(
 845         IStream* iface,
 846         IStream** ppstm)
 847 {
 848     FIXME("\n");
 849     return E_NOTIMPL;
 850 }
 851
 852 static const IStreamVtbl ITSS_IStream_vtbl =
 853 {
 854     ITSS_IStream_QueryInterface,
 855     ITSS_IStream_AddRef,
 856     ITSS_IStream_Release,
 857     ITSS_IStream_Read,
 858     ITSS_IStream_Write,
 859     ITSS_IStream_Seek,
 860     ITSS_IStream_SetSize,
 861     ITSS_IStream_CopyTo,
 862     ITSS_IStream_Commit,
 863     ITSS_IStream_Revert,
 864     ITSS_IStream_LockRegion,
 865     ITSS_IStream_UnlockRegion,
 866     ITSS_IStream_Stat,
 867     ITSS_IStream_Clone,
 868 };
 869
 870 static IStream_Impl *ITSS_create_stream(
 871            ITSS_IStorageImpl *stg, struct chmUnitInfo *ui )
 872 {
 873     IStream_Impl *stm;
 874
 875     stm = HeapAlloc( GetProcessHeap(), 0, sizeof (IStream_Impl) );
 876     stm->IStream_iface.lpVtbl = &ITSS_IStream_vtbl;
 877     stm->ref = 1;
 878     stm->addr = 0;
 879     stm->ui = *ui;
 880     stm->stg = stg;
 881     IStorage_AddRef( &stg->IStorage_iface );
 882
 883     ITSS_LockModule();
 884
 885     TRACE(" -> %p\n", stm );
 886
 887     return stm;
 888 }