ole/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 #ifndef __STORAGE32_H__
  16 #define __STORAGE32_H__
  17
  18 /*
  19  * Definitions for the file format offsets.
  20  */
  21 static const ULONG OFFSET_BIGBLOCKSIZEBITS   = 0x0000001e;
  22 static const ULONG OFFSET_SMALLBLOCKSIZEBITS = 0x00000020;
  23 static const ULONG OFFSET_BBDEPOTCOUNT       = 0x0000002C;
  24 static const ULONG OFFSET_ROOTSTARTBLOCK     = 0x00000030;
  25 static const ULONG OFFSET_SBDEPOTSTART       = 0x0000003C;
  26 static const ULONG OFFSET_EXTBBDEPOTSTART    = 0x00000044;
  27 static const ULONG OFFSET_EXTBBDEPOTCOUNT    = 0x00000048;
  28 static const ULONG OFFSET_BBDEPOTSTART       = 0x0000004C;
  29 static const ULONG OFFSET_PS_NAME            = 0x00000000;
  30 static const ULONG OFFSET_PS_NAMELENGTH      = 0x00000040;
  31 static const ULONG OFFSET_PS_PROPERTYTYPE    = 0x00000042;
  32 static const ULONG OFFSET_PS_PREVIOUSPROP    = 0x00000044;
  33 static const ULONG OFFSET_PS_NEXTPROP        = 0x00000048;
  34 static const ULONG OFFSET_PS_DIRPROP         = 0x0000004C;
  35 static const ULONG OFFSET_PS_GUID            = 0x00000050;
  36 static const ULONG OFFSET_PS_TSS1            = 0x00000064;
  37 static const ULONG OFFSET_PS_TSD1            = 0x00000068;
  38 static const ULONG OFFSET_PS_TSS2            = 0x0000006C;
  39 static const ULONG OFFSET_PS_TSD2            = 0x00000070;
  40 static const ULONG OFFSET_PS_STARTBLOCK      = 0x00000074;
  41 static const ULONG OFFSET_PS_SIZE            = 0x00000078;
  42 static const WORD  DEF_BIG_BLOCK_SIZE_BITS   = 0x0009;
  43 static const WORD  DEF_SMALL_BLOCK_SIZE_BITS = 0x0006;
  44 static const WORD  DEF_BIG_BLOCK_SIZE        = 0x0200;
  45 static const WORD  DEF_SMALL_BLOCK_SIZE      = 0x0040;
  46 static const ULONG BLOCK_EXTBBDEPOT          = 0xFFFFFFFC;
  47 static const ULONG BLOCK_SPECIAL             = 0xFFFFFFFD;
  48 static const ULONG BLOCK_END_OF_CHAIN        = 0xFFFFFFFE;
  49 static const ULONG BLOCK_UNUSED              = 0xFFFFFFFF;
  50 static const ULONG PROPERTY_NULL             = 0xFFFFFFFF;
  51
  52 #define PROPERTY_NAME_MAX_LEN    0x20
  53 #define PROPERTY_NAME_BUFFER_LEN 0x40
  54
  55 #define PROPSET_BLOCK_SIZE 0x00000080
  56
  57 /*
  58  * Property type of relation
  59  */
  60 #define PROPERTY_RELATION_PREVIOUS 0
  61 #define PROPERTY_RELATION_NEXT     1
  62 #define PROPERTY_RELATION_DIR      2
  63
  64 /*
  65  * Property type constants
  66  */
  67 #define PROPTYPE_STORAGE 0x01
  68 #define PROPTYPE_STREAM  0x02
  69 #define PROPTYPE_ROOT    0x05
  70
  71 /*
  72  * These defines assume a hardcoded blocksize. The code will assert
  73  * if the blocksize is different. Some changes will have to be done if it
  74  * becomes the case.
  75  */
  76 #define BIG_BLOCK_SIZE           0x200
  77 #define COUNT_BBDEPOTINHEADER    109
  78 #define LIMIT_TO_USE_SMALL_BLOCK 0x1000
  79 #define NUM_BLOCKS_PER_DEPOT_BLOCK 128
  80
  81 /*
  82  * These are signatures to detect the type of Document file.
  83  */
  84 static const BYTE STORAGE_magic[8]    ={0xd0,0xcf,0x11,0xe0,0xa1,0xb1,0x1a,0xe1};
  85 static const BYTE STORAGE_oldmagic[8] ={0xd0,0xcf,0x11,0xe0,0x0e,0x11,0xfc,0x0d};
  86
  87 /*
  88  * Forward declarations of all the structures used by the storage
  89  * module.
  90  */
  91 typedef struct StorageBaseImpl     StorageBaseImpl;
  92 typedef struct StorageImpl         StorageImpl;
  93 typedef struct StorageInternalImpl StorageInternalImpl;
  94 typedef struct BlockChainStream      BlockChainStream;
  95 typedef struct SmallBlockChainStream SmallBlockChainStream;
  96 typedef struct IEnumSTATSTGImpl      IEnumSTATSTGImpl;
  97 typedef struct StgProperty           StgProperty;
  98 typedef struct StgStreamImpl         StgStreamImpl;
  99
 100 /*
 101  * This utility structure is used to read/write the information in a storage
 102  * property.
 103  */
 104 struct StgProperty
 105 {
 106   WCHAR          name[PROPERTY_NAME_MAX_LEN];
 107   WORD           sizeOfNameString;
 108   BYTE           propertyType;
 109   ULONG          previousProperty;
 110   ULONG          nextProperty;
 111   ULONG          dirProperty;
 112   GUID           propertyUniqueID;
 113   ULONG          timeStampS1;
 114   ULONG          timeStampD1;
 115   ULONG          timeStampS2;
 116   ULONG          timeStampD2;
 117   ULONG          startingBlock;
 118   ULARGE_INTEGER size;
 119 };
 120
 121 /*************************************************************************
 122  * Big Block File support
 123  *
 124  * The big block file is an abstraction of a flat file separated in
 125  * same sized blocks. The implementation for the methods described in
 126  * this section appear in stg_bigblockfile.c
 127  */
 128
 129 /*
 130  * Declaration of the data structures
 131  */
 132 typedef struct BigBlockFile BigBlockFile,*LPBIGBLOCKFILE;
 133 typedef struct MappedPage   MappedPage,*LPMAPPEDPAGE;
 134 typedef struct BigBlock     BigBlock,*LPBIGBLOCK;
 135
 136 struct BigBlockFile
 137 {
 138   ULARGE_INTEGER filesize;
 139   ULONG blocksize;
 140   HANDLE hfile;
 141   HANDLE hfilemap;
 142   DWORD flProtect;
 143   MappedPage *headmap_ro;
 144   MappedPage *headmap_w;
 145   BigBlock *headblock;
 146 };
 147
 148 /*
 149  * Declaration of the functions used to manipulate the BigBlockFile
 150  * data structure.
 151  */
 152 BigBlockFile*  BIGBLOCKFILE_Construct(HANDLE hFile,
 153                                       DWORD openFlags,
 154                                       ULONG blocksize);
 155 void           BIGBLOCKFILE_Destructor(LPBIGBLOCKFILE This);
 156 void*          BIGBLOCKFILE_GetBigBlock(LPBIGBLOCKFILE This, ULONG index);
 157 void*          BIGBLOCKFILE_GetROBigBlock(LPBIGBLOCKFILE This, ULONG index);
 158 void           BIGBLOCKFILE_ReleaseBigBlock(LPBIGBLOCKFILE This, void *pBlock);
 159 void           BIGBLOCKFILE_SetSize(LPBIGBLOCKFILE This, ULARGE_INTEGER newSize);
 160 ULARGE_INTEGER BIGBLOCKFILE_GetSize(LPBIGBLOCKFILE This);
 161
 162 /****************************************************************************
 163  * Storage32BaseImpl definitions.
 164  *
 165  * This stucture defines the base information contained in all implementations
 166  * of IStorage32 contained in this filee storage implementation.
 167  *
 168  * In OOP terms, this is the base class for all the IStorage32 implementations
 169  * contained in this file.
 170  */
 171 struct StorageBaseImpl
 172 {
 173   ICOM_VTABLE(IStorage)*  lpvtbl;   /* Needs to be the first item in the stuct
 174                                        * since we want to cast this in a Storage32 pointer */
 175
 176   /*
 177    * Reference count of this object
 178    */
 179   ULONG ref;
 180
 181   /*
 182    * Ancestor storage (top level)
 183    */
 184   StorageImpl* ancestorStorage;
 185
 186   /*
 187    * Index of the property for the root of
 188    * this storage
 189    */
 190   ULONG rootPropertySetIndex;
 191
 192   /*
 193    * virtual Destructor method.
 194    */
 195   void (*v_destructor)(StorageBaseImpl*);
 196 };
 197
 198
 199 /*
 200  * Prototypes for the methods of the Storage32BaseImpl class.
 201  */
 202 HRESULT WINAPI StorageBaseImpl_QueryInterface(
 203             IStorage*        iface,
 204             REFIID             riid,
 205             void**             ppvObject);
 206
 207 ULONG WINAPI StorageBaseImpl_AddRef(
 208             IStorage*        iface);
 209
 210 ULONG WINAPI StorageBaseImpl_Release(
 211             IStorage*        iface);
 212
 213 HRESULT WINAPI StorageBaseImpl_OpenStream(
 214             IStorage*        iface,
 215             const OLECHAR*   pwcsName,  /* [string][in] */
 216             void*              reserved1, /* [unique][in] */
 217             DWORD              grfMode,   /* [in] */
 218             DWORD              reserved2, /* [in] */
 219             IStream**        ppstm);    /* [out] */
 220
 221 HRESULT WINAPI StorageBaseImpl_OpenStorage(
 222             IStorage*        iface,
 223             const OLECHAR*   pwcsName,      /* [string][unique][in] */
 224             IStorage*        pstgPriority,  /* [unique][in] */
 225             DWORD              grfMode,       /* [in] */
 226             SNB              snbExclude,    /* [unique][in] */
 227             DWORD              reserved,      /* [in] */
 228             IStorage**       ppstg);        /* [out] */
 229
 230 HRESULT WINAPI StorageBaseImpl_EnumElements(
 231             IStorage*        iface,
 232             DWORD              reserved1, /* [in] */
 233             void*              reserved2, /* [size_is][unique][in] */
 234             DWORD              reserved3, /* [in] */
 235             IEnumSTATSTG**     ppenum);   /* [out] */
 236
 237 HRESULT WINAPI StorageBaseImpl_Stat(
 238             IStorage*        iface,
 239             STATSTG*           pstatstg,     /* [out] */
 240             DWORD              grfStatFlag); /* [in] */
 241
 242 HRESULT WINAPI StorageBaseImpl_RenameElement(
 243             IStorage*        iface,
 244             const OLECHAR*   pwcsOldName,  /* [string][in] */
 245             const OLECHAR*   pwcsNewName); /* [string][in] */
 246
 247 HRESULT WINAPI StorageBaseImpl_CreateStream(
 248             IStorage*        iface,
 249             const OLECHAR*   pwcsName,  /* [string][in] */
 250             DWORD              grfMode,   /* [in] */
 251             DWORD              reserved1, /* [in] */
 252             DWORD              reserved2, /* [in] */
 253             IStream**        ppstm);    /* [out] */
 254
 255 HRESULT WINAPI StorageBaseImpl_SetClass(
 256             IStorage*        iface,
 257             REFCLSID           clsid);  /* [in] */
 258
 259 /****************************************************************************
 260  * Storage32Impl definitions.
 261  *
 262  * This implementation of the IStorage32 interface represents a root
 263  * storage. Basically, a document file.
 264  */
 265 struct StorageImpl
 266 {
 267   ICOM_VTABLE(IStorage) *lpvtbl;   /* Needs to be the first item in the stuct
 268                                       * since we want to cast this in a Storage32 pointer */
 269
 270   /*
 271    * Declare the member of the Storage32BaseImpl class to allow
 272    * casting as a Storage32BaseImpl
 273    */
 274   ULONG                 ref;
 275   struct StorageImpl* ancestorStorage;
 276   ULONG                 rootPropertySetIndex;
 277   void (*v_destructor)(struct StorageImpl*);
 278
 279   /*
 280    * The following data members are specific to the Storage32Impl
 281    * class
 282    */
 283   HANDLE           hFile;      /* Physical support for the Docfile */
 284
 285   /*
 286    * File header
 287    */
 288   WORD  bigBlockSizeBits;
 289   WORD  smallBlockSizeBits;
 290   ULONG bigBlockSize;
 291   ULONG smallBlockSize;
 292   ULONG bigBlockDepotCount;
 293   ULONG rootStartBlock;
 294   ULONG smallBlockDepotStart;
 295   ULONG extBigBlockDepotStart;
 296   ULONG extBigBlockDepotCount;
 297   ULONG bigBlockDepotStart[COUNT_BBDEPOTINHEADER];
 298
 299   ULONG blockDepotCached[NUM_BLOCKS_PER_DEPOT_BLOCK];
 300   ULONG indexBlockDepotCached;
 301
 302   /*
 303    * Abstraction of the big block chains for the chains of the header.
 304    */
 305   BlockChainStream* rootBlockChain;
 306   BlockChainStream* smallBlockDepotChain;
 307   BlockChainStream* smallBlockRootChain;
 308
 309   /*
 310    * Pointer to the big block file abstraction
 311    */
 312   BigBlockFile* bigBlockFile;
 313 };
 314
 315 /*
 316  * Method declaration for the Storage32Impl class
 317  */
 318
 319 HRESULT WINAPI StorageImpl_CreateStorage(
 320             IStorage*      iface,
 321             const OLECHAR* pwcsName,  /* [string][in] */
 322             DWORD            grfMode,   /* [in] */
 323             DWORD            dwStgFmt,  /* [in] */
 324             DWORD            reserved2, /* [in] */
 325             IStorage**     ppstg);    /* [out] */
 326
 327 HRESULT WINAPI StorageImpl_CopyTo(
 328             IStorage*      iface,
 329             DWORD          ciidExclude,  /* [in] */
 330             const IID*     rgiidExclude, /* [size_is][unique][in] */
 331             SNB            snbExclude, /* [unique][in] */
 332             IStorage*    pstgDest);    /* [unique][in] */
 333
 334 HRESULT WINAPI StorageImpl_MoveElementTo(
 335             IStorage*      iface,
 336             const OLECHAR* pwcsName,    /* [string][in] */
 337             IStorage*      pstgDest,    /* [unique][in] */
 338             const OLECHAR* pwcsNewName, /* [string][in] */
 339             DWORD            grfFlags);   /* [in] */
 340
 341 HRESULT WINAPI StorageImpl_Commit(
 342             IStorage*      iface,
 343             DWORD          grfCommitFlags); /* [in] */
 344
 345 HRESULT WINAPI StorageImpl_Revert(
 346             IStorage*      iface);
 347
 348 HRESULT WINAPI StorageImpl_DestroyElement(
 349             IStorage*      iface,
 350             const OLECHAR* pwcsName); /* [string][in] */
 351
 352 HRESULT WINAPI StorageImpl_SetElementTimes(
 353             IStorage*      iface,
 354             const OLECHAR* pwcsName, /* [string][in] */
 355             const FILETIME*  pctime,   /* [in] */
 356             const FILETIME*  patime,   /* [in] */
 357             const FILETIME*  pmtime);  /* [in] */
 358
 359 HRESULT WINAPI StorageImpl_SetStateBits(
 360             IStorage*      iface,
 361             DWORD          grfStateBits, /* [in] */
 362             DWORD          grfMask);     /* [in] */
 363
 364 void StorageImpl_Destroy(
 365             StorageImpl* This);
 366
 367 HRESULT StorageImpl_Construct(
 368             StorageImpl* This,
 369             HANDLE       hFile,
 370             DWORD          openFlags);
 371
 372 BOOL StorageImpl_ReadBigBlock(
 373             StorageImpl* This,
 374             ULONG          blockIndex,
 375             void*          buffer);
 376
 377 BOOL StorageImpl_WriteBigBlock(
 378             StorageImpl* This,
 379             ULONG          blockIndex,
 380             void*          buffer);
 381
 382 void* StorageImpl_GetROBigBlock(
 383             StorageImpl* This,
 384             ULONG          blockIndex);
 385
 386 void* StorageImpl_GetBigBlock(
 387             StorageImpl* This,
 388             ULONG          blockIndex);
 389
 390 void StorageImpl_ReleaseBigBlock(
 391             StorageImpl* This,
 392             void*          pBigBlock);
 393
 394 ULONG StorageImpl_GetNextFreeBigBlock(
 395             StorageImpl* This);
 396
 397 void StorageImpl_FreeBigBlock(
 398             StorageImpl* This,
 399             ULONG blockIndex);
 400
 401 ULONG StorageImpl_GetNextBlockInChain(
 402             StorageImpl* This,
 403             ULONG blockIndex);
 404
 405 void StorageImpl_SetNextBlockInChain(
 406             StorageImpl* This,
 407             ULONG blockIndex,
 408       ULONG nextBlock);
 409
 410 HRESULT StorageImpl_LoadFileHeader(
 411             StorageImpl* This);
 412
 413 void StorageImpl_SaveFileHeader(
 414             StorageImpl* This);
 415
 416 BOOL StorageImpl_ReadProperty(
 417             StorageImpl* This,
 418             ULONG          index,
 419             StgProperty*    buffer);
 420
 421 BOOL StorageImpl_WriteProperty(
 422             StorageImpl* This,
 423             ULONG          index,
 424             StgProperty*   buffer);
 425
 426 BlockChainStream* Storage32Impl_SmallBlocksToBigBlocks(
 427                       StorageImpl* This,
 428                       SmallBlockChainStream** ppsbChain);
 429
 430 ULONG Storage32Impl_GetNextExtendedBlock(StorageImpl* This,
 431                                          ULONG blockIndex);
 432
 433 void Storage32Impl_AddBlockDepot(StorageImpl* This,
 434                                  ULONG blockIndex);
 435
 436 ULONG Storage32Impl_AddExtBlockDepot(StorageImpl* This);
 437
 438 ULONG Storage32Impl_GetExtDepotBlock(StorageImpl* This,
 439                                      ULONG depotIndex);
 440
 441 void Storage32Impl_SetExtDepotBlock(StorageImpl* This,
 442                                     ULONG depotIndex,
 443                                     ULONG blockIndex);
 444 /****************************************************************************
 445  * Storage32InternalImpl definitions.
 446  *
 447  * Definition of the implementation structure for the IStorage32 interface.
 448  * This one implements the IStorage32 interface for storage that are
 449  * inside another storage.
 450  */
 451 struct StorageInternalImpl
 452 {
 453   ICOM_VTABLE(IStorage) *lpvtbl;        /* Needs to be the first item in the stuct
 454                                          * since we want to cast this in a Storage32 pointer */
 455
 456   /*
 457    * Declare the member of the Storage32BaseImpl class to allow
 458    * casting as a Storage32BaseImpl
 459    */
 460   ULONG                      ref;
 461   struct StorageImpl* ancestorStorage;
 462   ULONG                    rootPropertySetIndex;
 463   void (*v_destructor)(struct StorageInternalImpl*);
 464
 465   /*
 466    * There is no specific data for this class.
 467    */
 468 };
 469
 470 /*
 471  * Method definitions for the Storage32InternalImpl class.
 472  */
 473 StorageInternalImpl* StorageInternalImpl_Construct(
 474             StorageImpl* ancestorStorage,
 475             ULONG          rootTropertyIndex);
 476
 477 void StorageInternalImpl_Destroy(
 478             StorageInternalImpl* This);
 479
 480 HRESULT WINAPI StorageInternalImpl_Commit(
 481             IStorage*            iface,
 482             DWORD                  grfCommitFlags); /* [in] */
 483
 484 HRESULT WINAPI StorageInternalImpl_Revert(
 485             IStorage*            iface);
 486
 487
 488 /****************************************************************************
 489  * IEnumSTATSTGImpl definitions.
 490  *
 491  * Definition of the implementation structure for the IEnumSTATSTGImpl interface.
 492  * This class allows iterating through the content of a storage and to find
 493  * specific items inside it.
 494  */
 495 struct IEnumSTATSTGImpl
 496 {
 497   ICOM_VTABLE(IEnumSTATSTG) *lpvtbl;    /* Needs to be the first item in the stuct
 498                                          * since we want to cast this in a IEnumSTATSTG pointer */
 499
 500   ULONG          ref;                   /* Reference count */
 501   StorageImpl* parentStorage;         /* Reference to the parent storage */
 502   ULONG          firstPropertyNode;     /* Index of the root of the storage to enumerate */
 503
 504   /*
 505    * The current implementation of the IEnumSTATSTGImpl class uses a stack
 506    * to walk the property sets to get the content of a storage. This stack
 507    * is implemented by the following 3 data members
 508    */
 509   ULONG          stackSize;
 510   ULONG          stackMaxSize;
 511   ULONG*         stackToVisit;
 512
 513 #define ENUMSTATSGT_SIZE_INCREMENT 10
 514 };
 515
 516 /*
 517  * Method definitions for the IEnumSTATSTGImpl class.
 518  */
 519 HRESULT WINAPI IEnumSTATSTGImpl_QueryInterface(
 520             IEnumSTATSTG*     iface,
 521             REFIID            riid,
 522             void**            ppvObject);
 523
 524 ULONG WINAPI IEnumSTATSTGImpl_AddRef(
 525             IEnumSTATSTG*     iface);
 526
 527 ULONG WINAPI IEnumSTATSTGImpl_Release(
 528             IEnumSTATSTG*     iface);
 529
 530 HRESULT WINAPI IEnumSTATSTGImpl_Next(
 531             IEnumSTATSTG*     iface,
 532             ULONG             celt,
 533             STATSTG*          rgelt,
 534             ULONG*            pceltFetched);
 535
 536 HRESULT WINAPI IEnumSTATSTGImpl_Skip(
 537             IEnumSTATSTG*     iface,
 538             ULONG             celt);
 539
 540 HRESULT WINAPI IEnumSTATSTGImpl_Reset(
 541             IEnumSTATSTG* iface);
 542
 543 HRESULT WINAPI IEnumSTATSTGImpl_Clone(
 544             IEnumSTATSTG*     iface,
 545             IEnumSTATSTG**    ppenum);
 546
 547 IEnumSTATSTGImpl* IEnumSTATSTGImpl_Construct(
 548             StorageImpl* This,
 549             ULONG          firstPropertyNode);
 550
 551 void IEnumSTATSTGImpl_Destroy(
 552             IEnumSTATSTGImpl* This);
 553
 554 void IEnumSTATSTGImpl_PushSearchNode(
 555             IEnumSTATSTGImpl* This,
 556             ULONG             nodeToPush);
 557
 558 ULONG IEnumSTATSTGImpl_PopSearchNode(
 559             IEnumSTATSTGImpl* This,
 560             BOOL            remove);
 561
 562 ULONG IEnumSTATSTGImpl_FindProperty(
 563             IEnumSTATSTGImpl* This,
 564             const OLECHAR*  lpszPropName,
 565             StgProperty*      buffer);
 566
 567 INT IEnumSTATSTGImpl_FindParentProperty(
 568   IEnumSTATSTGImpl *This,
 569   ULONG             childProperty,
 570   StgProperty      *currentProperty,
 571   ULONG            *propertyId);
 572
 573
 574 /****************************************************************************
 575  * StgStreamImpl definitions.
 576  *
 577  * This class imlements the IStream32 inteface and represents a stream
 578  * located inside a storage object.
 579  */
 580 struct StgStreamImpl
 581 {
 582   ICOM_VTABLE(IStream) *lpvtbl;  /* Needs to be the first item in the stuct
 583                                     * since we want to cast this in a IStream pointer */
 584
 585   /*
 586    * Reference count
 587    */
 588   ULONG              ref;
 589
 590   /*
 591    * Storage that is the parent(owner) of the stream
 592    */
 593   StorageBaseImpl* parentStorage;
 594
 595   /*
 596    * Index of the property that owns (points to) this stream.
 597    */
 598   ULONG              ownerProperty;
 599
 600   /*
 601    * Helper variable that contains the size of the stream
 602    */
 603   ULARGE_INTEGER     streamSize;
 604
 605   /*
 606    * This is the current position of the cursor in the stream
 607    */
 608   ULARGE_INTEGER     currentPosition;
 609
 610   /*
 611    * The information in the stream is represented by a chain of small blocks
 612    * or a chain of large blocks. Depending on the case, one of the two
 613    * following variabled points to that information.
 614    */
 615   BlockChainStream*      bigBlockChain;
 616   SmallBlockChainStream* smallBlockChain;
 617
 618 };
 619
 620 /*
 621  * Method definition for the StgStreamImpl class.
 622  */
 623 StgStreamImpl* StgStreamImpl_Construct(
 624                 StorageBaseImpl* parentStorage,
 625                 ULONG              ownerProperty);
 626
 627 void StgStreamImpl_Destroy(
 628                 StgStreamImpl* This);
 629
 630 void StgStreamImpl_OpenBlockChain(
 631                 StgStreamImpl* This);
 632
 633 HRESULT WINAPI StgStreamImpl_QueryInterface(
 634                 IStream*      iface,
 635                 REFIID         riid,            /* [in] */
 636                 void**         ppvObject);  /* [iid_is][out] */
 637
 638 ULONG WINAPI StgStreamImpl_AddRef(
 639                 IStream*      iface);
 640
 641 ULONG WINAPI StgStreamImpl_Release(
 642                 IStream*      iface);
 643
 644 HRESULT WINAPI StgStreamImpl_Read(
 645                 IStream*      iface,
 646                 void*          pv,        /* [length_is][size_is][out] */
 647                 ULONG          cb,        /* [in] */
 648                 ULONG*         pcbRead);  /* [out] */
 649
 650 HRESULT WINAPI StgStreamImpl_Write(
 651                 IStream*      iface,
 652                 const void*    pv,          /* [size_is][in] */
 653                 ULONG          cb,          /* [in] */
 654                 ULONG*         pcbWritten); /* [out] */
 655
 656 HRESULT WINAPI StgStreamImpl_Seek(
 657                 IStream*      iface,
 658                 LARGE_INTEGER   dlibMove,         /* [in] */
 659                 DWORD           dwOrigin,         /* [in] */
 660                 ULARGE_INTEGER* plibNewPosition); /* [out] */
 661
 662 HRESULT WINAPI StgStreamImpl_SetSize(
 663                 IStream*      iface,
 664                 ULARGE_INTEGER  libNewSize);  /* [in] */
 665
 666 HRESULT WINAPI StgStreamImpl_CopyTo(
 667                 IStream*      iface,
 668                 IStream*      pstm,         /* [unique][in] */
 669                 ULARGE_INTEGER  cb,           /* [in] */
 670                 ULARGE_INTEGER* pcbRead,      /* [out] */
 671                 ULARGE_INTEGER* pcbWritten);  /* [out] */
 672
 673 HRESULT WINAPI StgStreamImpl_Commit(
 674                 IStream*      iface,
 675                 DWORD           grfCommitFlags); /* [in] */
 676
 677 HRESULT WINAPI StgStreamImpl_Revert(
 678                 IStream*  iface);
 679
 680 HRESULT WINAPI StgStreamImpl_LockRegion(
 681                 IStream*     iface,
 682                 ULARGE_INTEGER libOffset,   /* [in] */
 683                 ULARGE_INTEGER cb,          /* [in] */
 684                 DWORD          dwLockType); /* [in] */
 685
 686 HRESULT WINAPI StgStreamImpl_UnlockRegion(
 687                 IStream*     iface,
 688                 ULARGE_INTEGER libOffset,   /* [in] */
 689                 ULARGE_INTEGER cb,          /* [in] */
 690                 DWORD          dwLockType); /* [in] */
 691
 692 HRESULT WINAPI StgStreamImpl_Stat(
 693                 IStream*     iface,
 694                 STATSTG*       pstatstg,     /* [out] */
 695                 DWORD          grfStatFlag); /* [in] */
 696
 697 HRESULT WINAPI StgStreamImpl_Clone(
 698                 IStream*     iface,
 699                 IStream**    ppstm);       /* [out] */
 700
 701
 702 /********************************************************************************
 703  * The StorageUtl_ functions are miscelaneous utility functions. Most of which are
 704  * abstractions used to read values from file buffers without having to worry
 705  * about bit order
 706  */
 707 void StorageUtl_ReadWord(void* buffer, ULONG offset, WORD* value);
 708 void StorageUtl_WriteWord(void* buffer, ULONG offset, WORD value);
 709 void StorageUtl_ReadDWord(void* buffer, ULONG offset, DWORD* value);
 710 void StorageUtl_WriteDWord(void* buffer, ULONG offset, DWORD value);
 711 void StorageUtl_ReadGUID(void* buffer, ULONG offset, GUID* value);
 712 void StorageUtl_WriteGUID(void* buffer, ULONG offset, GUID* value);
 713 void StorageUtl_CopyPropertyToSTATSTG(STATSTG*     destination,
 714                                              StgProperty* source,
 715                                              int          statFlags);
 716
 717 /****************************************************************************
 718  * BlockChainStream definitions.
 719  *
 720  * The BlockChainStream class is a utility class that is used to create an
 721  * abstraction of the big block chains in the storage file.
 722  */
 723 struct BlockChainStream
 724 {
 725   StorageImpl* parentStorage;
 726   ULONG*         headOfStreamPlaceHolder;
 727   ULONG          ownerPropertyIndex;
 728 };
 729
 730 /*
 731  * Methods for the BlockChainStream class.
 732  */
 733 BlockChainStream* BlockChainStream_Construct(
 734                 StorageImpl* parentStorage,
 735                 ULONG*         headOfStreamPlaceHolder,
 736                 ULONG          propertyIndex);
 737
 738 void BlockChainStream_Destroy(
 739                 BlockChainStream* This);
 740
 741 ULONG BlockChainStream_GetHeadOfChain(
 742                 BlockChainStream* This);
 743
 744 BOOL BlockChainStream_ReadAt(
 745                 BlockChainStream* This,
 746                 ULARGE_INTEGER offset,
 747                 ULONG          size,
 748                 void*          buffer,
 749                 ULONG*         bytesRead);
 750
 751 BOOL BlockChainStream_WriteAt(
 752                 BlockChainStream* This,
 753                 ULARGE_INTEGER offset,
 754                 ULONG          size,
 755                 const void*    buffer,
 756                 ULONG*         bytesWritten);
 757
 758 BOOL BlockChainStream_SetSize(
 759                 BlockChainStream* This,
 760                 ULARGE_INTEGER    newSize);
 761
 762 ULARGE_INTEGER BlockChainStream_GetSize(
 763     BlockChainStream* This);
 764
 765 ULONG BlockChainStream_GetCount(
 766     BlockChainStream* This);
 767
 768 /****************************************************************************
 769  * SmallBlockChainStream definitions.
 770  *
 771  * The SmallBlockChainStream class is a utility class that is used to create an
 772  * abstraction of the small block chains in the storage file.
 773  */
 774 struct SmallBlockChainStream
 775 {
 776   StorageImpl* parentStorage;
 777   ULONG          ownerPropertyIndex;
 778 };
 779
 780 /*
 781  * Methods of the SmallBlockChainStream class.
 782  */
 783 SmallBlockChainStream* SmallBlockChainStream_Construct(
 784                StorageImpl* parentStorage,
 785                ULONG          propertyIndex);
 786
 787 void SmallBlockChainStream_Destroy(
 788                SmallBlockChainStream* This);
 789
 790 ULONG SmallBlockChainStream_GetHeadOfChain(
 791                SmallBlockChainStream* This);
 792
 793 ULONG SmallBlockChainStream_GetNextBlockInChain(
 794                SmallBlockChainStream* This,
 795                ULONG                  blockIndex);
 796
 797 void SmallBlockChainStream_SetNextBlockInChain(
 798          SmallBlockChainStream* This,
 799          ULONG                  blockIndex,
 800          ULONG                  nextBlock);
 801
 802 void SmallBlockChainStream_FreeBlock(
 803          SmallBlockChainStream* This,
 804          ULONG                  blockIndex);
 805
 806 ULONG SmallBlockChainStream_GetNextFreeBlock(
 807          SmallBlockChainStream* This);
 808
 809 BOOL SmallBlockChainStream_ReadAt(
 810                SmallBlockChainStream* This,
 811                ULARGE_INTEGER offset,
 812                ULONG          size,
 813                void*          buffer,
 814                ULONG*         bytesRead);
 815
 816 BOOL SmallBlockChainStream_WriteAt(
 817                SmallBlockChainStream* This,
 818                ULARGE_INTEGER offset,
 819                ULONG          size,
 820                const void*    buffer,
 821                ULONG*         bytesWritten);
 822
 823 BOOL SmallBlockChainStream_SetSize(
 824                SmallBlockChainStream* This,
 825                ULARGE_INTEGER          newSize);
 826
 827 ULARGE_INTEGER SmallBlockChainStream_GetSize(
 828          SmallBlockChainStream* This);
 829
 830 ULONG SmallBlockChainStream_GetCount(
 831          SmallBlockChainStream* This);
 832
 833
 834 #endif __STORAGE32_H__
 835
 836
 837