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   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   const IStorageVtbl *lpVtbl;    /* Needs to be the first item in the struct
 218                             * since we want to cast this in a Storage32 pointer */
 219
 220   const IPropertySetStorageVtbl *pssVtbl; /* interface for adding a properties stream */
 221
 222   /*
 223    * Reference count of this object
 224    */
 225   LONG 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    * flags that this storage was opened or created with
 245    */
 246   DWORD openFlags;
 247 };
 248
 249
 250 /****************************************************************************
 251  * Storage32Impl definitions.
 252  *
 253  * This implementation of the IStorage32 interface represents a root
 254  * storage. Basically, a document file.
 255  */
 256 struct StorageImpl
 257 {
 258   struct StorageBaseImpl base;
 259
 260   /*
 261    * The following data members are specific to the Storage32Impl
 262    * class
 263    */
 264   HANDLE           hFile;      /* Physical support for the Docfile */
 265   LPOLESTR         pwcsName;   /* Full path of the document file */
 266
 267   /* FIXME: should this be in Storage32BaseImpl ? */
 268   WCHAR            filename[PROPERTY_NAME_BUFFER_LEN];
 269
 270   /*
 271    * File header
 272    */
 273   WORD  bigBlockSizeBits;
 274   WORD  smallBlockSizeBits;
 275   ULONG bigBlockSize;
 276   ULONG smallBlockSize;
 277   ULONG bigBlockDepotCount;
 278   ULONG rootStartBlock;
 279   ULONG smallBlockDepotStart;
 280   ULONG extBigBlockDepotStart;
 281   ULONG extBigBlockDepotCount;
 282   ULONG bigBlockDepotStart[COUNT_BBDEPOTINHEADER];
 283
 284   ULONG blockDepotCached[NUM_BLOCKS_PER_DEPOT_BLOCK];
 285   ULONG indexBlockDepotCached;
 286   ULONG prevFreeBlock;
 287
 288   /*
 289    * Abstraction of the big block chains for the chains of the header.
 290    */
 291   BlockChainStream* rootBlockChain;
 292   BlockChainStream* smallBlockDepotChain;
 293   BlockChainStream* smallBlockRootChain;
 294
 295   /*
 296    * Pointer to the big block file abstraction
 297    */
 298   BigBlockFile* bigBlockFile;
 299 };
 300
 301 void StorageImpl_Destroy(
 302             StorageBaseImpl* This);
 303
 304 HRESULT StorageImpl_Construct(
 305             StorageImpl* This,
 306             HANDLE       hFile,
 307             LPCOLESTR    pwcsName,
 308             ILockBytes*  pLkbyt,
 309             DWORD        openFlags,
 310             BOOL         fileBased,
 311             BOOL         fileCreate);
 312
 313 BOOL StorageImpl_ReadBigBlock(
 314             StorageImpl* This,
 315             ULONG          blockIndex,
 316             void*          buffer);
 317
 318 BOOL StorageImpl_WriteBigBlock(
 319             StorageImpl* This,
 320             ULONG          blockIndex,
 321             void*          buffer);
 322
 323 void* StorageImpl_GetROBigBlock(
 324             StorageImpl* This,
 325             ULONG          blockIndex);
 326
 327 void* StorageImpl_GetBigBlock(
 328             StorageImpl* This,
 329             ULONG          blockIndex);
 330
 331 void StorageImpl_ReleaseBigBlock(
 332             StorageImpl* This,
 333             void*          pBigBlock);
 334
 335 ULONG StorageImpl_GetNextFreeBigBlock(
 336             StorageImpl* This);
 337
 338 void StorageImpl_FreeBigBlock(
 339             StorageImpl* This,
 340             ULONG blockIndex);
 341
 342 HRESULT StorageImpl_GetNextBlockInChain(
 343             StorageImpl* This,
 344             ULONG blockIndex,
 345             ULONG* nextBlockIndex);
 346
 347 void StorageImpl_SetNextBlockInChain(
 348             StorageImpl* This,
 349             ULONG blockIndex,
 350             ULONG nextBlock);
 351
 352 HRESULT StorageImpl_LoadFileHeader(
 353             StorageImpl* This);
 354
 355 void StorageImpl_SaveFileHeader(
 356             StorageImpl* This);
 357
 358 BOOL StorageImpl_ReadProperty(
 359             StorageImpl* This,
 360             ULONG          index,
 361             StgProperty*    buffer);
 362
 363 BOOL StorageImpl_WriteProperty(
 364             StorageImpl* This,
 365             ULONG          index,
 366             StgProperty*   buffer);
 367
 368 BlockChainStream* Storage32Impl_SmallBlocksToBigBlocks(
 369                       StorageImpl* This,
 370                       SmallBlockChainStream** ppsbChain);
 371
 372 ULONG Storage32Impl_GetNextExtendedBlock(StorageImpl* This,
 373                                          ULONG blockIndex);
 374
 375 void Storage32Impl_AddBlockDepot(StorageImpl* This,
 376                                  ULONG blockIndex);
 377
 378 ULONG Storage32Impl_AddExtBlockDepot(StorageImpl* This);
 379
 380 ULONG Storage32Impl_GetExtDepotBlock(StorageImpl* This,
 381                                      ULONG depotIndex);
 382
 383 void Storage32Impl_SetExtDepotBlock(StorageImpl* This,
 384                                     ULONG depotIndex,
 385                                     ULONG blockIndex);
 386 /****************************************************************************
 387  * Storage32InternalImpl definitions.
 388  *
 389  * Definition of the implementation structure for the IStorage32 interface.
 390  * This one implements the IStorage32 interface for storage that are
 391  * inside another storage.
 392  */
 393 struct StorageInternalImpl
 394 {
 395   struct StorageBaseImpl base;
 396
 397   /*
 398    * There is no specific data for this class.
 399    */
 400 };
 401
 402 /*
 403  * Method definitions for the Storage32InternalImpl class.
 404  */
 405 StorageInternalImpl* StorageInternalImpl_Construct(
 406             StorageImpl* ancestorStorage,
 407             DWORD          openFlags,
 408             ULONG          rootTropertyIndex);
 409
 410 void StorageInternalImpl_Destroy(
 411             StorageBaseImpl* This);
 412
 413 HRESULT WINAPI StorageInternalImpl_Commit(
 414             IStorage*            iface,
 415             DWORD                  grfCommitFlags); /* [in] */
 416
 417 HRESULT WINAPI StorageInternalImpl_Revert(
 418             IStorage*            iface);
 419
 420
 421 /****************************************************************************
 422  * IEnumSTATSTGImpl definitions.
 423  *
 424  * Definition of the implementation structure for the IEnumSTATSTGImpl interface.
 425  * This class allows iterating through the content of a storage and to find
 426  * specific items inside it.
 427  */
 428 struct IEnumSTATSTGImpl
 429 {
 430   const IEnumSTATSTGVtbl *lpVtbl;    /* Needs to be the first item in the struct
 431                                 * since we want to cast this in an IEnumSTATSTG pointer */
 432
 433   LONG           ref;                   /* Reference count */
 434   StorageImpl* parentStorage;         /* Reference to the parent storage */
 435   ULONG          firstPropertyNode;     /* Index of the root of the storage to enumerate */
 436
 437   /*
 438    * The current implementation of the IEnumSTATSTGImpl class uses a stack
 439    * to walk the property sets to get the content of a storage. This stack
 440    * is implemented by the following 3 data members
 441    */
 442   ULONG          stackSize;
 443   ULONG          stackMaxSize;
 444   ULONG*         stackToVisit;
 445
 446 #define ENUMSTATSGT_SIZE_INCREMENT 10
 447 };
 448
 449 IEnumSTATSTGImpl* IEnumSTATSTGImpl_Construct(
 450             StorageImpl* This,
 451             ULONG          firstPropertyNode);
 452
 453 void IEnumSTATSTGImpl_Destroy(
 454             IEnumSTATSTGImpl* This);
 455
 456 void IEnumSTATSTGImpl_PushSearchNode(
 457             IEnumSTATSTGImpl* This,
 458             ULONG             nodeToPush);
 459
 460 ULONG IEnumSTATSTGImpl_PopSearchNode(
 461             IEnumSTATSTGImpl* This,
 462             BOOL            remove);
 463
 464 ULONG IEnumSTATSTGImpl_FindProperty(
 465             IEnumSTATSTGImpl* This,
 466             const OLECHAR*  lpszPropName,
 467             StgProperty*      buffer);
 468
 469 INT IEnumSTATSTGImpl_FindParentProperty(
 470   IEnumSTATSTGImpl *This,
 471   ULONG             childProperty,
 472   StgProperty      *currentProperty,
 473   ULONG            *propertyId);
 474
 475
 476 /****************************************************************************
 477  * StgStreamImpl definitions.
 478  *
 479  * This class imlements the IStream32 inteface and represents a stream
 480  * located inside a storage object.
 481  */
 482 struct StgStreamImpl
 483 {
 484   const IStreamVtbl *lpVtbl;  /* Needs to be the first item in the struct
 485                          * since we want to cast this to an IStream pointer */
 486
 487   /*
 488    * Reference count
 489    */
 490   LONG               ref;
 491
 492   /*
 493    * Storage that is the parent(owner) of the stream
 494    */
 495   StorageBaseImpl* parentStorage;
 496
 497   /*
 498    * Access mode of this stream.
 499    */
 500   DWORD grfMode;
 501
 502   /*
 503    * Index of the property that owns (points to) this stream.
 504    */
 505   ULONG              ownerProperty;
 506
 507   /*
 508    * Helper variable that contains the size of the stream
 509    */
 510   ULARGE_INTEGER     streamSize;
 511
 512   /*
 513    * This is the current position of the cursor in the stream
 514    */
 515   ULARGE_INTEGER     currentPosition;
 516
 517   /*
 518    * The information in the stream is represented by a chain of small blocks
 519    * or a chain of large blocks. Depending on the case, one of the two
 520    * following variabled points to that information.
 521    */
 522   BlockChainStream*      bigBlockChain;
 523   SmallBlockChainStream* smallBlockChain;
 524 };
 525
 526 /*
 527  * Method definition for the StgStreamImpl class.
 528  */
 529 StgStreamImpl* StgStreamImpl_Construct(
 530                 StorageBaseImpl* parentStorage,
 531     DWORD            grfMode,
 532     ULONG            ownerProperty);
 533
 534
 535 /******************************************************************************
 536  * Endian conversion macros
 537  */
 538 #ifdef WORDS_BIGENDIAN
 539
 540 #define htole32(x) RtlUlongByteSwap(x)
 541 #define htole16(x) RtlUshortByteSwap(x)
 542 #define le32toh(x) RtlUlongByteSwap(x)
 543 #define le16toh(x) RtlUshortByteSwap(x)
 544
 545 #else
 546
 547 #define htole32(x) (x)
 548 #define htole16(x) (x)
 549 #define le32toh(x) (x)
 550 #define le16toh(x) (x)
 551
 552 #endif
 553
 554 /******************************************************************************
 555  * The StorageUtl_ functions are miscellaneous utility functions. Most of which
 556  * are abstractions used to read values from file buffers without having to
 557  * worry about bit order
 558  */
 559 void StorageUtl_ReadWord(const BYTE* buffer, ULONG offset, WORD* value);
 560 void StorageUtl_WriteWord(BYTE* buffer, ULONG offset, WORD value);
 561 void StorageUtl_ReadDWord(const BYTE* buffer, ULONG offset, DWORD* value);
 562 void StorageUtl_WriteDWord(BYTE* buffer, ULONG offset, DWORD value);
 563 void StorageUtl_ReadULargeInteger(const BYTE* buffer, ULONG offset,
 564  ULARGE_INTEGER* value);
 565 void StorageUtl_WriteULargeInteger(BYTE* buffer, ULONG offset,
 566  const ULARGE_INTEGER *value);
 567 void StorageUtl_ReadGUID(const BYTE* buffer, ULONG offset, GUID* value);
 568 void StorageUtl_WriteGUID(BYTE* buffer, ULONG offset, const GUID* value);
 569 void StorageUtl_CopyPropertyToSTATSTG(STATSTG*     destination,
 570                                              StgProperty* source,
 571                                              int          statFlags);
 572
 573 /****************************************************************************
 574  * BlockChainStream definitions.
 575  *
 576  * The BlockChainStream class is a utility class that is used to create an
 577  * abstraction of the big block chains in the storage file.
 578  */
 579 struct BlockChainStream
 580 {
 581   StorageImpl* parentStorage;
 582   ULONG*       headOfStreamPlaceHolder;
 583   ULONG        ownerPropertyIndex;
 584   ULONG        lastBlockNoInSequence;
 585   ULONG        lastBlockNoInSequenceIndex;
 586   ULONG        tailIndex;
 587   ULONG        numBlocks;
 588 };
 589
 590 /*
 591  * Methods for the BlockChainStream class.
 592  */
 593 BlockChainStream* BlockChainStream_Construct(
 594                 StorageImpl* parentStorage,
 595                 ULONG*         headOfStreamPlaceHolder,
 596                 ULONG          propertyIndex);
 597
 598 void BlockChainStream_Destroy(
 599                 BlockChainStream* This);
 600
 601 ULONG BlockChainStream_GetHeadOfChain(
 602                 BlockChainStream* This);
 603
 604 BOOL BlockChainStream_ReadAt(
 605                 BlockChainStream* This,
 606                 ULARGE_INTEGER offset,
 607                 ULONG          size,
 608                 void*          buffer,
 609                 ULONG*         bytesRead);
 610
 611 BOOL BlockChainStream_WriteAt(
 612                 BlockChainStream* This,
 613                 ULARGE_INTEGER offset,
 614                 ULONG          size,
 615                 const void*    buffer,
 616                 ULONG*         bytesWritten);
 617
 618 BOOL BlockChainStream_SetSize(
 619                 BlockChainStream* This,
 620                 ULARGE_INTEGER    newSize);
 621
 622 ULARGE_INTEGER BlockChainStream_GetSize(
 623     BlockChainStream* This);
 624
 625 ULONG BlockChainStream_GetCount(
 626     BlockChainStream* This);
 627
 628 /****************************************************************************
 629  * SmallBlockChainStream definitions.
 630  *
 631  * The SmallBlockChainStream class is a utility class that is used to create an
 632  * abstraction of the small block chains in the storage file.
 633  */
 634 struct SmallBlockChainStream
 635 {
 636   StorageImpl* parentStorage;
 637   ULONG          ownerPropertyIndex;
 638 };
 639
 640 /*
 641  * Methods of the SmallBlockChainStream class.
 642  */
 643 SmallBlockChainStream* SmallBlockChainStream_Construct(
 644                StorageImpl* parentStorage,
 645                ULONG          propertyIndex);
 646
 647 void SmallBlockChainStream_Destroy(
 648                SmallBlockChainStream* This);
 649
 650 ULONG SmallBlockChainStream_GetHeadOfChain(
 651                SmallBlockChainStream* This);
 652
 653 HRESULT SmallBlockChainStream_GetNextBlockInChain(
 654                SmallBlockChainStream* This,
 655                ULONG                  blockIndex,
 656                ULONG*                 nextBlockIndex);
 657
 658 void SmallBlockChainStream_SetNextBlockInChain(
 659          SmallBlockChainStream* This,
 660          ULONG                  blockIndex,
 661          ULONG                  nextBlock);
 662
 663 void SmallBlockChainStream_FreeBlock(
 664          SmallBlockChainStream* This,
 665          ULONG                  blockIndex);
 666
 667 ULONG SmallBlockChainStream_GetNextFreeBlock(
 668          SmallBlockChainStream* This);
 669
 670 BOOL SmallBlockChainStream_ReadAt(
 671                SmallBlockChainStream* This,
 672                ULARGE_INTEGER offset,
 673                ULONG          size,
 674                void*          buffer,
 675                ULONG*         bytesRead);
 676
 677 BOOL SmallBlockChainStream_WriteAt(
 678                SmallBlockChainStream* This,
 679                ULARGE_INTEGER offset,
 680                ULONG          size,
 681                const void*    buffer,
 682                ULONG*         bytesWritten);
 683
 684 BOOL SmallBlockChainStream_SetSize(
 685                SmallBlockChainStream* This,
 686                ULARGE_INTEGER          newSize);
 687
 688 ULARGE_INTEGER SmallBlockChainStream_GetSize(
 689          SmallBlockChainStream* This);
 690
 691 ULONG SmallBlockChainStream_GetCount(
 692          SmallBlockChainStream* This);
 693
 694
 695 #endif /* __STORAGE32_H__ */