dlls/ole32/storage32.h

   1 /*
   2  * Compound Storage (32 bit version)
   3  *
   4  * Implemented using the documentation of the LAOLA project at
   5  * <URL:http://wwwwbs.cs.tu-berlin.de/~schwartz/pmh/index.html>
   6  * (Thanks to Martin Schwartz <schwartz@cs.tu-berlin.de>)
   7  *
   8  * This include file contains definitions of types and function
   9  * prototypes that are used in the many files implementing the
  10  * storage functionality
  11  *
  12  * Copyright 1998,1999 Francis Beaudet
  13  * Copyright 1998,1999 Thuy Nguyen
  14  *
  15  * This library is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU Lesser General Public
  17  * License as published by the Free Software Foundation; either
  18  * version 2.1 of the License, or (at your option) any later version.
  19  *
  20  * This library is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23  * Lesser General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU Lesser General Public
  26  * License along with this library; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28  */
  29 #ifndef __STORAGE32_H__
  30 #define __STORAGE32_H__
  31
  32 #include <stdarg.h>
  33
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "winnt.h"
  37 #include "objbase.h"
  38 #include "winreg.h"
  39 #include "winternl.h"
  40
  41 /*
  42  * Definitions for the file format offsets.
  43  */
  44 static const ULONG OFFSET_BIGBLOCKSIZEBITS   = 0x0000001e;
  45 static const ULONG OFFSET_SMALLBLOCKSIZEBITS = 0x00000020;
  46 static const ULONG OFFSET_BBDEPOTCOUNT       = 0x0000002C;
  47 static const ULONG OFFSET_ROOTSTARTBLOCK     = 0x00000030;
  48 static const ULONG OFFSET_SBDEPOTSTART       = 0x0000003C;
  49 static const ULONG OFFSET_SBDEPOTCOUNT       = 0x00000040;
  50 static const ULONG OFFSET_EXTBBDEPOTSTART    = 0x00000044;
  51 static const ULONG OFFSET_EXTBBDEPOTCOUNT    = 0x00000048;
  52 static const ULONG OFFSET_BBDEPOTSTART       = 0x0000004C;
  53 static const ULONG OFFSET_PS_NAME            = 0x00000000;
  54 static const ULONG OFFSET_PS_NAMELENGTH      = 0x00000040;
  55 static const ULONG OFFSET_PS_PROPERTYTYPE    = 0x00000042;
  56 static const ULONG OFFSET_PS_PREVIOUSPROP    = 0x00000044;
  57 static const ULONG OFFSET_PS_NEXTPROP        = 0x00000048;
  58 static const ULONG OFFSET_PS_DIRPROP         = 0x0000004C;
  59 static const ULONG OFFSET_PS_GUID            = 0x00000050;
  60 static const ULONG OFFSET_PS_TSS1            = 0x00000064;
  61 static const ULONG OFFSET_PS_TSD1            = 0x00000068;
  62 static const ULONG OFFSET_PS_TSS2            = 0x0000006C;
  63 static const ULONG OFFSET_PS_TSD2            = 0x00000070;
  64 static const ULONG OFFSET_PS_STARTBLOCK      = 0x00000074;
  65 static const ULONG OFFSET_PS_SIZE            = 0x00000078;
  66 static const WORD  DEF_BIG_BLOCK_SIZE_BITS   = 0x0009;
  67 static const WORD  DEF_SMALL_BLOCK_SIZE_BITS = 0x0006;
  68 static const WORD  DEF_BIG_BLOCK_SIZE        = 0x0200;
  69 static const WORD  DEF_SMALL_BLOCK_SIZE      = 0x0040;
  70 static const ULONG BLOCK_EXTBBDEPOT          = 0xFFFFFFFC;
  71 static const ULONG BLOCK_SPECIAL             = 0xFFFFFFFD;
  72 static const ULONG BLOCK_END_OF_CHAIN        = 0xFFFFFFFE;
  73 static const ULONG BLOCK_UNUSED              = 0xFFFFFFFF;
  74 static const ULONG PROPERTY_NULL             = 0xFFFFFFFF;
  75
  76 #define PROPERTY_NAME_MAX_LEN    0x20
  77 #define PROPERTY_NAME_BUFFER_LEN 0x40
  78
  79 #define PROPSET_BLOCK_SIZE 0x00000080
  80
  81 /*
  82  * Property type of relation
  83  */
  84 #define PROPERTY_RELATION_PREVIOUS 0
  85 #define PROPERTY_RELATION_NEXT     1
  86 #define PROPERTY_RELATION_DIR      2
  87
  88 /*
  89  * Property type constants
  90  */
  91 #define PROPTYPE_STORAGE 0x01
  92 #define PROPTYPE_STREAM  0x02
  93 #define PROPTYPE_ROOT    0x05
  94
  95 /*
  96  * These defines assume a hardcoded blocksize. The code will assert
  97  * if the blocksize is different. Some changes will have to be done if it
  98  * becomes the case.
  99  */
 100 #define BIG_BLOCK_SIZE           0x200
 101 #define COUNT_BBDEPOTINHEADER    109
 102 #define LIMIT_TO_USE_SMALL_BLOCK 0x1000
 103 #define NUM_BLOCKS_PER_DEPOT_BLOCK 128
 104
 105 #define STGM_ACCESS_MODE(stgm)   ((stgm)&0x0000f)
 106 #define STGM_SHARE_MODE(stgm)    ((stgm)&0x000f0)
 107 #define STGM_CREATE_MODE(stgm)   ((stgm)&0x0f000)
 108
 109 #define STGM_KNOWN_FLAGS (0xf0ff | \
 110      STGM_TRANSACTED | STGM_CONVERT | STGM_PRIORITY | STGM_NOSCRATCH | \
 111      STGM_NOSNAPSHOT | STGM_DIRECT_SWMR | STGM_DELETEONRELEASE | STGM_SIMPLE)
 112
 113 /*
 114  * These are signatures to detect the type of Document file.
 115  */
 116 static const BYTE STORAGE_magic[8]    ={0xd0,0xcf,0x11,0xe0,0xa1,0xb1,0x1a,0xe1};
 117 static const BYTE STORAGE_oldmagic[8] ={0xd0,0xcf,0x11,0xe0,0x0e,0x11,0xfc,0x0d};
 118
 119 /*
 120  * Forward declarations of all the structures used by the storage
 121  * module.
 122  */
 123 typedef struct StorageBaseImpl     StorageBaseImpl;
 124 typedef struct StorageImpl         StorageImpl;
 125 typedef struct StorageInternalImpl StorageInternalImpl;
 126 typedef struct BlockChainStream      BlockChainStream;
 127 typedef struct SmallBlockChainStream SmallBlockChainStream;
 128 typedef struct IEnumSTATSTGImpl      IEnumSTATSTGImpl;
 129 typedef struct StgProperty           StgProperty;
 130 typedef struct StgStreamImpl         StgStreamImpl;
 131
 132 /*
 133  * This utility structure is used to read/write the information in a storage
 134  * property.
 135  */
 136 struct StgProperty
 137 {
 138   WCHAR          name[PROPERTY_NAME_MAX_LEN];
 139   WORD           sizeOfNameString;
 140   BYTE           propertyType;
 141   ULONG          previousProperty;
 142   ULONG          nextProperty;
 143   ULONG          dirProperty;
 144   GUID           propertyUniqueID;
 145   ULONG          timeStampS1;
 146   ULONG          timeStampD1;
 147   ULONG          timeStampS2;
 148   ULONG          timeStampD2;
 149   ULONG          startingBlock;
 150   ULARGE_INTEGER size;
 151 };
 152
 153 /*************************************************************************
 154  * Big Block File support
 155  *
 156  * The big block file is an abstraction of a flat file separated in
 157  * same sized blocks. The implementation for the methods described in
 158  * this section appear in stg_bigblockfile.c
 159  */
 160
 161 /*
 162  * Declaration of the data structures
 163  */
 164 typedef struct BigBlockFile BigBlockFile,*LPBIGBLOCKFILE;
 165 typedef struct MappedPage   MappedPage,*LPMAPPEDPAGE;
 166
 167 struct BigBlockFile
 168 {
 169   BOOL fileBased;
 170   ULARGE_INTEGER filesize;
 171   ULONG blocksize;
 172   HANDLE hfile;
 173   HANDLE hfilemap;
 174   DWORD flProtect;
 175   MappedPage *maplist;
 176   MappedPage *victimhead, *victimtail;
 177   ULONG num_victim_pages;
 178   ILockBytes *pLkbyt;
 179   HGLOBAL hbytearray;
 180   LPVOID pbytearray;
 181 };
 182
 183 /*
 184  * Declaration of the functions used to manipulate the BigBlockFile
 185  * data structure.
 186  */
 187 BigBlockFile*  BIGBLOCKFILE_Construct(HANDLE hFile,
 188                                       ILockBytes* pLkByt,
 189                                       DWORD openFlags,
 190                                       ULONG blocksize,
 191                                       BOOL fileBased);
 192 void           BIGBLOCKFILE_Destructor(LPBIGBLOCKFILE This);
 193 void*          BIGBLOCKFILE_GetBigBlock(LPBIGBLOCKFILE This, ULONG index);
 194 void*          BIGBLOCKFILE_GetROBigBlock(LPBIGBLOCKFILE This, ULONG index);
 195 void           BIGBLOCKFILE_ReleaseBigBlock(LPBIGBLOCKFILE This, void *pBlock);
 196 void           BIGBLOCKFILE_SetSize(LPBIGBLOCKFILE This, ULARGE_INTEGER newSize);
 197 ULARGE_INTEGER BIGBLOCKFILE_GetSize(LPBIGBLOCKFILE This);
 198
 199 /*************************************************************************
 200  * Ole Convert support
 201  */
 202
 203 void OLECONVERT_CreateOleStream(LPSTORAGE pStorage);
 204 HRESULT OLECONVERT_CreateCompObjStream(LPSTORAGE pStorage, LPCSTR strOleTypeName);
 205
 206 /****************************************************************************
 207  * Storage32BaseImpl definitions.
 208  *
 209  * This structure defines the base information contained in all implementations
 210  * of IStorage32 contained in this file storage implementation.
 211  *
 212  * In OOP terms, this is the base class for all the IStorage32 implementations
 213  * contained in this file.
 214  */
 215 struct StorageBaseImpl
 216 {
 217   IStorageVtbl *lpVtbl;    /* Needs to be the first item in the struct
 218                             * since we want to cast this in a Storage32 pointer */
 219
 220   IPropertySetStorageVtbl *pssVtbl; /* interface for adding a properties stream */
 221
 222   /*
 223    * Reference count of this object
 224    */
 225   ULONG ref;
 226
 227   /*
 228    * Ancestor storage (top level)
 229    */
 230   StorageImpl* ancestorStorage;
 231
 232   /*
 233    * Index of the property for the root of
 234    * this storage
 235    */
 236   ULONG rootPropertySetIndex;
 237
 238   /*
 239    * virtual Destructor method.
 240    */
 241   void (*v_destructor)(StorageBaseImpl*);
 242 };
 243
 244
 245 /****************************************************************************
 246  * Storage32Impl definitions.
 247  *
 248  * This implementation of the IStorage32 interface represents a root
 249  * storage. Basically, a document file.
 250  */
 251 struct StorageImpl
 252 {
 253   struct StorageBaseImpl base;
 254
 255   /*
 256    * The following data members are specific to the Storage32Impl
 257    * class
 258    */
 259   HANDLE           hFile;      /* Physical support for the Docfile */
 260   LPOLESTR         pwcsName;   /* Full path of the document file */
 261
 262   /* FIXME: should this be in Storage32BaseImpl ? */
 263   WCHAR            filename[PROPERTY_NAME_BUFFER_LEN];
 264
 265   /*
 266    * File header
 267    */
 268   WORD  bigBlockSizeBits;
 269   WORD  smallBlockSizeBits;
 270   ULONG bigBlockSize;
 271   ULONG smallBlockSize;
 272   ULONG bigBlockDepotCount;
 273   ULONG rootStartBlock;
 274   ULONG smallBlockDepotStart;
 275   ULONG extBigBlockDepotStart;
 276   ULONG extBigBlockDepotCount;
 277   ULONG bigBlockDepotStart[COUNT_BBDEPOTINHEADER];
 278
 279   ULONG blockDepotCached[NUM_BLOCKS_PER_DEPOT_BLOCK];
 280   ULONG indexBlockDepotCached;
 281   ULONG prevFreeBlock;
 282
 283   /*
 284    * Abstraction of the big block chains for the chains of the header.
 285    */
 286   BlockChainStream* rootBlockChain;
 287   BlockChainStream* smallBlockDepotChain;
 288   BlockChainStream* smallBlockRootChain;
 289
 290   /*
 291    * Pointer to the big block file abstraction
 292    */
 293   BigBlockFile* bigBlockFile;
 294 };
 295
 296 void StorageImpl_Destroy(
 297             StorageBaseImpl* This);
 298
 299 HRESULT StorageImpl_Construct(
 300             StorageImpl* This,
 301             HANDLE       hFile,
 302             LPCOLESTR    pwcsName,
 303             ILockBytes*  pLkbyt,
 304             DWORD        openFlags,
 305             BOOL         fileBased,
 306             BOOL         fileCreate);
 307
 308 BOOL StorageImpl_ReadBigBlock(
 309             StorageImpl* This,
 310             ULONG          blockIndex,
 311             void*          buffer);
 312
 313 BOOL StorageImpl_WriteBigBlock(
 314             StorageImpl* This,
 315             ULONG          blockIndex,
 316             void*          buffer);
 317
 318 void* StorageImpl_GetROBigBlock(
 319             StorageImpl* This,
 320             ULONG          blockIndex);
 321
 322 void* StorageImpl_GetBigBlock(
 323             StorageImpl* This,
 324             ULONG          blockIndex);
 325
 326 void StorageImpl_ReleaseBigBlock(
 327             StorageImpl* This,
 328             void*          pBigBlock);
 329
 330 ULONG StorageImpl_GetNextFreeBigBlock(
 331             StorageImpl* This);
 332
 333 void StorageImpl_FreeBigBlock(
 334             StorageImpl* This,
 335             ULONG blockIndex);
 336
 337 HRESULT StorageImpl_GetNextBlockInChain(
 338             StorageImpl* This,
 339             ULONG blockIndex,
 340             ULONG* nextBlockIndex);
 341
 342 void StorageImpl_SetNextBlockInChain(
 343             StorageImpl* This,
 344             ULONG blockIndex,
 345             ULONG nextBlock);
 346
 347 HRESULT StorageImpl_LoadFileHeader(
 348             StorageImpl* This);
 349
 350 void StorageImpl_SaveFileHeader(
 351             StorageImpl* This);
 352
 353 BOOL StorageImpl_ReadProperty(
 354             StorageImpl* This,
 355             ULONG          index,
 356             StgProperty*    buffer);
 357
 358 BOOL StorageImpl_WriteProperty(
 359             StorageImpl* This,
 360             ULONG          index,
 361             StgProperty*   buffer);
 362
 363 BlockChainStream* Storage32Impl_SmallBlocksToBigBlocks(
 364                       StorageImpl* This,
 365                       SmallBlockChainStream** ppsbChain);
 366
 367 ULONG Storage32Impl_GetNextExtendedBlock(StorageImpl* This,
 368                                          ULONG blockIndex);
 369
 370 void Storage32Impl_AddBlockDepot(StorageImpl* This,
 371                                  ULONG blockIndex);
 372
 373 ULONG Storage32Impl_AddExtBlockDepot(StorageImpl* This);
 374
 375 ULONG Storage32Impl_GetExtDepotBlock(StorageImpl* This,
 376                                      ULONG depotIndex);
 377
 378 void Storage32Impl_SetExtDepotBlock(StorageImpl* This,
 379                                     ULONG depotIndex,
 380                                     ULONG blockIndex);
 381 /****************************************************************************
 382  * Storage32InternalImpl definitions.
 383  *
 384  * Definition of the implementation structure for the IStorage32 interface.
 385  * This one implements the IStorage32 interface for storage that are
 386  * inside another storage.
 387  */
 388 struct StorageInternalImpl
 389 {
 390   struct StorageBaseImpl base;
 391
 392   /*
 393    * There is no specific data for this class.
 394    */
 395 };
 396
 397 /*
 398  * Method definitions for the Storage32InternalImpl class.
 399  */
 400 StorageInternalImpl* StorageInternalImpl_Construct(
 401             StorageImpl* ancestorStorage,
 402             ULONG          rootTropertyIndex);
 403
 404 void StorageInternalImpl_Destroy(
 405             StorageBaseImpl* This);
 406
 407 HRESULT WINAPI StorageInternalImpl_Commit(
 408             IStorage*            iface,
 409             DWORD                  grfCommitFlags); /* [in] */
 410
 411 HRESULT WINAPI StorageInternalImpl_Revert(
 412             IStorage*            iface);
 413
 414
 415 /****************************************************************************
 416  * IEnumSTATSTGImpl definitions.
 417  *
 418  * Definition of the implementation structure for the IEnumSTATSTGImpl interface.
 419  * This class allows iterating through the content of a storage and to find
 420  * specific items inside it.
 421  */
 422 struct IEnumSTATSTGImpl
 423 {
 424   IEnumSTATSTGVtbl *lpVtbl;    /* Needs to be the first item in the struct
 425                                 * since we want to cast this in an IEnumSTATSTG pointer */
 426
 427   ULONG          ref;                   /* Reference count */
 428   StorageImpl* parentStorage;         /* Reference to the parent storage */
 429   ULONG          firstPropertyNode;     /* Index of the root of the storage to enumerate */
 430
 431   /*
 432    * The current implementation of the IEnumSTATSTGImpl class uses a stack
 433    * to walk the property sets to get the content of a storage. This stack
 434    * is implemented by the following 3 data members
 435    */
 436   ULONG          stackSize;
 437   ULONG          stackMaxSize;
 438   ULONG*         stackToVisit;
 439
 440 #define ENUMSTATSGT_SIZE_INCREMENT 10
 441 };
 442
 443 IEnumSTATSTGImpl* IEnumSTATSTGImpl_Construct(
 444             StorageImpl* This,
 445             ULONG          firstPropertyNode);
 446
 447 void IEnumSTATSTGImpl_Destroy(
 448             IEnumSTATSTGImpl* This);
 449
 450 void IEnumSTATSTGImpl_PushSearchNode(
 451             IEnumSTATSTGImpl* This,
 452             ULONG             nodeToPush);
 453
 454 ULONG IEnumSTATSTGImpl_PopSearchNode(
 455             IEnumSTATSTGImpl* This,
 456             BOOL            remove);
 457
 458 ULONG IEnumSTATSTGImpl_FindProperty(
 459             IEnumSTATSTGImpl* This,
 460             const OLECHAR*  lpszPropName,
 461             StgProperty*      buffer);
 462
 463 INT IEnumSTATSTGImpl_FindParentProperty(
 464   IEnumSTATSTGImpl *This,
 465   ULONG             childProperty,
 466   StgProperty      *currentProperty,
 467   ULONG            *propertyId);
 468
 469
 470 /****************************************************************************
 471  * StgStreamImpl definitions.
 472  *
 473  * This class imlements the IStream32 inteface and represents a stream
 474  * located inside a storage object.
 475  */
 476 struct StgStreamImpl
 477 {
 478   IStreamVtbl *lpVtbl;  /* Needs to be the first item in the struct
 479                          * since we want to cast this to an IStream pointer */
 480
 481   /*
 482    * Reference count
 483    */
 484   ULONG              ref;
 485
 486   /*
 487    * Storage that is the parent(owner) of the stream
 488    */
 489   StorageBaseImpl* parentStorage;
 490
 491   /*
 492    * Access mode of this stream.
 493    */
 494   DWORD grfMode;
 495
 496   /*
 497    * Index of the property that owns (points to) this stream.
 498    */
 499   ULONG              ownerProperty;
 500
 501   /*
 502    * Helper variable that contains the size of the stream
 503    */
 504   ULARGE_INTEGER     streamSize;
 505
 506   /*
 507    * This is the current position of the cursor in the stream
 508    */
 509   ULARGE_INTEGER     currentPosition;
 510
 511   /*
 512    * The information in the stream is represented by a chain of small blocks
 513    * or a chain of large blocks. Depending on the case, one of the two
 514    * following variabled points to that information.
 515    */
 516   BlockChainStream*      bigBlockChain;
 517   SmallBlockChainStream* smallBlockChain;
 518 };
 519
 520 /*
 521  * Method definition for the StgStreamImpl class.
 522  */
 523 StgStreamImpl* StgStreamImpl_Construct(
 524                 StorageBaseImpl* parentStorage,
 525     DWORD            grfMode,
 526     ULONG            ownerProperty);
 527
 528
 529 /******************************************************************************
 530  * Endian conversion macros
 531  */
 532 #ifdef WORDS_BIGENDIAN
 533
 534 #define htole32(x) RtlUlongByteSwap(x)
 535 #define htole16(x) RtlUshortByteSwap(x)
 536 #define le32toh(x) RtlUlongByteSwap(x)
 537 #define le16toh(x) RtlUshortByteSwap(x)
 538
 539 #else
 540
 541 #define htole32(x) (x)
 542 #define htole16(x) (x)
 543 #define le32toh(x) (x)
 544 #define le16toh(x) (x)
 545
 546 #endif
 547
 548 /******************************************************************************
 549  * The StorageUtl_ functions are miscellaneous utility functions. Most of which
 550  * are abstractions used to read values from file buffers without having to
 551  * worry about bit order
 552  */
 553 void StorageUtl_ReadWord(const BYTE* buffer, ULONG offset, WORD* value);
 554 void StorageUtl_WriteWord(BYTE* buffer, ULONG offset, WORD value);
 555 void StorageUtl_ReadDWord(const BYTE* buffer, ULONG offset, DWORD* value);
 556 void StorageUtl_WriteDWord(BYTE* buffer, ULONG offset, DWORD value);
 557 void StorageUtl_ReadGUID(const BYTE* buffer, ULONG offset, GUID* value);
 558 void StorageUtl_WriteGUID(BYTE* buffer, ULONG offset, const GUID* value);
 559 void StorageUtl_CopyPropertyToSTATSTG(STATSTG*     destination,
 560                                              StgProperty* source,
 561                                              int          statFlags);
 562
 563 /****************************************************************************
 564  * BlockChainStream definitions.
 565  *
 566  * The BlockChainStream class is a utility class that is used to create an
 567  * abstraction of the big block chains in the storage file.
 568  */
 569 struct BlockChainStream
 570 {
 571   StorageImpl* parentStorage;
 572   ULONG*       headOfStreamPlaceHolder;
 573   ULONG        ownerPropertyIndex;
 574   ULONG        lastBlockNoInSequence;
 575   ULONG        lastBlockNoInSequenceIndex;
 576   ULONG        tailIndex;
 577   ULONG        numBlocks;
 578 };
 579
 580 /*
 581  * Methods for the BlockChainStream class.
 582  */
 583 BlockChainStream* BlockChainStream_Construct(
 584                 StorageImpl* parentStorage,
 585                 ULONG*         headOfStreamPlaceHolder,
 586                 ULONG          propertyIndex);
 587
 588 void BlockChainStream_Destroy(
 589                 BlockChainStream* This);
 590
 591 ULONG BlockChainStream_GetHeadOfChain(
 592                 BlockChainStream* This);
 593
 594 BOOL BlockChainStream_ReadAt(
 595                 BlockChainStream* This,
 596                 ULARGE_INTEGER offset,
 597                 ULONG          size,
 598                 void*          buffer,
 599                 ULONG*         bytesRead);
 600
 601 BOOL BlockChainStream_WriteAt(
 602                 BlockChainStream* This,
 603                 ULARGE_INTEGER offset,
 604                 ULONG          size,
 605                 const void*    buffer,
 606                 ULONG*         bytesWritten);
 607
 608 BOOL BlockChainStream_SetSize(
 609                 BlockChainStream* This,
 610                 ULARGE_INTEGER    newSize);
 611
 612 ULARGE_INTEGER BlockChainStream_GetSize(
 613     BlockChainStream* This);
 614
 615 ULONG BlockChainStream_GetCount(
 616     BlockChainStream* This);
 617
 618 /****************************************************************************
 619  * SmallBlockChainStream definitions.
 620  *
 621  * The SmallBlockChainStream class is a utility class that is used to create an
 622  * abstraction of the small block chains in the storage file.
 623  */
 624 struct SmallBlockChainStream
 625 {
 626   StorageImpl* parentStorage;
 627   ULONG          ownerPropertyIndex;
 628 };
 629
 630 /*
 631  * Methods of the SmallBlockChainStream class.
 632  */
 633 SmallBlockChainStream* SmallBlockChainStream_Construct(
 634                StorageImpl* parentStorage,
 635                ULONG          propertyIndex);
 636
 637 void SmallBlockChainStream_Destroy(
 638                SmallBlockChainStream* This);
 639
 640 ULONG SmallBlockChainStream_GetHeadOfChain(
 641                SmallBlockChainStream* This);
 642
 643 HRESULT SmallBlockChainStream_GetNextBlockInChain(
 644                SmallBlockChainStream* This,
 645                ULONG                  blockIndex,
 646                ULONG*                 nextBlockIndex);
 647
 648 void SmallBlockChainStream_SetNextBlockInChain(
 649          SmallBlockChainStream* This,
 650          ULONG                  blockIndex,
 651          ULONG                  nextBlock);
 652
 653 void SmallBlockChainStream_FreeBlock(
 654          SmallBlockChainStream* This,
 655          ULONG                  blockIndex);
 656
 657 ULONG SmallBlockChainStream_GetNextFreeBlock(
 658          SmallBlockChainStream* This);
 659
 660 BOOL SmallBlockChainStream_ReadAt(
 661                SmallBlockChainStream* This,
 662                ULARGE_INTEGER offset,
 663                ULONG          size,
 664                void*          buffer,
 665                ULONG*         bytesRead);
 666
 667 BOOL SmallBlockChainStream_WriteAt(
 668                SmallBlockChainStream* This,
 669                ULARGE_INTEGER offset,
 670                ULONG          size,
 671                const void*    buffer,
 672                ULONG*         bytesWritten);
 673
 674 BOOL SmallBlockChainStream_SetSize(
 675                SmallBlockChainStream* This,
 676                ULARGE_INTEGER          newSize);
 677
 678 ULARGE_INTEGER SmallBlockChainStream_GetSize(
 679          SmallBlockChainStream* This);
 680
 681 ULONG SmallBlockChainStream_GetCount(
 682          SmallBlockChainStream* This);
 683
 684
 685 #endif /* __STORAGE32_H__ */