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  * Copyright 2010 Vincent Povirk for CodeWeavers
  15  *
  16  * This library is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU Lesser General Public
  18  * License as published by the Free Software Foundation; either
  19  * version 2.1 of the License, or (at your option) any later version.
  20  *
  21  * This library is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24  * Lesser General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU Lesser General Public
  27  * License along with this library; if not, write to the Free Software
  28  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  29  */
  30 #ifndef __STORAGE32_H__
  31 #define __STORAGE32_H__
  32
  33 #include <stdarg.h>
  34
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "winnt.h"
  38 #include "objbase.h"
  39 #include "winreg.h"
  40 #include "winternl.h"
  41 #include "wine/list.h"
  42
  43 /*
  44  * Definitions for the file format offsets.
  45  */
  46 static const ULONG OFFSET_MINORVERSION       = 0x00000018;
  47 static const ULONG OFFSET_MAJORVERSION       = 0x0000001a;
  48 static const ULONG OFFSET_BYTEORDERMARKER    = 0x0000001c;
  49 static const ULONG OFFSET_BIGBLOCKSIZEBITS   = 0x0000001e;
  50 static const ULONG OFFSET_SMALLBLOCKSIZEBITS = 0x00000020;
  51 static const ULONG OFFSET_DIRSECTORCOUNT     = 0x00000028;
  52 static const ULONG OFFSET_BBDEPOTCOUNT       = 0x0000002C;
  53 static const ULONG OFFSET_ROOTSTARTBLOCK     = 0x00000030;
  54 static const ULONG OFFSET_TRANSACTIONSIG     = 0x00000034;
  55 static const ULONG OFFSET_SMALLBLOCKLIMIT    = 0x00000038;
  56 static const ULONG OFFSET_SBDEPOTSTART       = 0x0000003C;
  57 static const ULONG OFFSET_SBDEPOTCOUNT       = 0x00000040;
  58 static const ULONG OFFSET_EXTBBDEPOTSTART    = 0x00000044;
  59 static const ULONG OFFSET_EXTBBDEPOTCOUNT    = 0x00000048;
  60 static const ULONG OFFSET_BBDEPOTSTART       = 0x0000004C;
  61 static const ULONG OFFSET_PS_NAME            = 0x00000000;
  62 static const ULONG OFFSET_PS_NAMELENGTH      = 0x00000040;
  63 static const ULONG OFFSET_PS_STGTYPE         = 0x00000042;
  64 static const ULONG OFFSET_PS_LEFTCHILD       = 0x00000044;
  65 static const ULONG OFFSET_PS_RIGHTCHILD      = 0x00000048;
  66 static const ULONG OFFSET_PS_DIRROOT         = 0x0000004C;
  67 static const ULONG OFFSET_PS_GUID            = 0x00000050;
  68 static const ULONG OFFSET_PS_CTIMELOW        = 0x00000064;
  69 static const ULONG OFFSET_PS_CTIMEHIGH       = 0x00000068;
  70 static const ULONG OFFSET_PS_MTIMELOW        = 0x0000006C;
  71 static const ULONG OFFSET_PS_MTIMEHIGH       = 0x00000070;
  72 static const ULONG OFFSET_PS_STARTBLOCK      = 0x00000074;
  73 static const ULONG OFFSET_PS_SIZE            = 0x00000078;
  74 static const ULONG OFFSET_PS_SIZE_HIGH       = 0x0000007C;
  75 static const WORD  DEF_BIG_BLOCK_SIZE_BITS   = 0x0009;
  76 static const WORD  MIN_BIG_BLOCK_SIZE_BITS   = 0x0009;
  77 static const WORD  MAX_BIG_BLOCK_SIZE_BITS   = 0x000c;
  78 static const WORD  DEF_SMALL_BLOCK_SIZE_BITS = 0x0006;
  79 static const WORD  DEF_BIG_BLOCK_SIZE        = 0x0200;
  80 static const WORD  DEF_SMALL_BLOCK_SIZE      = 0x0040;
  81 static const ULONG BLOCK_FIRST_SPECIAL       = 0xFFFFFFFB;
  82 static const ULONG BLOCK_EXTBBDEPOT          = 0xFFFFFFFC;
  83 static const ULONG BLOCK_SPECIAL             = 0xFFFFFFFD;
  84 static const ULONG BLOCK_END_OF_CHAIN        = 0xFFFFFFFE;
  85 static const ULONG BLOCK_UNUSED              = 0xFFFFFFFF;
  86 static const ULONG DIRENTRY_NULL             = 0xFFFFFFFF;
  87
  88 #define DIRENTRY_NAME_MAX_LEN    0x20
  89 #define DIRENTRY_NAME_BUFFER_LEN 0x40
  90
  91 #define RAW_DIRENTRY_SIZE 0x00000080
  92
  93 #define HEADER_SIZE 512
  94
  95 #define MIN_BIG_BLOCK_SIZE 0x200
  96 #define MAX_BIG_BLOCK_SIZE 0x1000
  97
  98 /*
  99  * Type of child entry link
 100  */
 101 #define DIRENTRY_RELATION_PREVIOUS 0
 102 #define DIRENTRY_RELATION_NEXT     1
 103 #define DIRENTRY_RELATION_DIR      2
 104
 105 /*
 106  * type constant used in files for the root storage
 107  */
 108 #define STGTY_ROOT 0x05
 109
 110 #define COUNT_BBDEPOTINHEADER    109
 111
 112 /* FIXME: This value is stored in the header, but we hard-code it to 0x1000. */
 113 #define LIMIT_TO_USE_SMALL_BLOCK 0x1000
 114
 115 #define STGM_ACCESS_MODE(stgm)   ((stgm)&0x0000f)
 116 #define STGM_SHARE_MODE(stgm)    ((stgm)&0x000f0)
 117 #define STGM_CREATE_MODE(stgm)   ((stgm)&0x0f000)
 118
 119 #define STGM_KNOWN_FLAGS (0xf0ff | \
 120      STGM_TRANSACTED | STGM_CONVERT | STGM_PRIORITY | STGM_NOSCRATCH | \
 121      STGM_NOSNAPSHOT | STGM_DIRECT_SWMR | STGM_DELETEONRELEASE | STGM_SIMPLE)
 122
 123 /*
 124  * Forward declarations of all the structures used by the storage
 125  * module.
 126  */
 127 typedef struct StorageBaseImpl     StorageBaseImpl;
 128 typedef struct StorageBaseImplVtbl StorageBaseImplVtbl;
 129 typedef struct StorageImpl         StorageImpl;
 130 typedef struct BlockChainStream      BlockChainStream;
 131 typedef struct SmallBlockChainStream SmallBlockChainStream;
 132 typedef struct IEnumSTATSTGImpl      IEnumSTATSTGImpl;
 133 typedef struct DirEntry              DirEntry;
 134 typedef struct StgStreamImpl         StgStreamImpl;
 135
 136 /*
 137  * A reference to a directory entry in the file or a transacted cache.
 138  */
 139 typedef ULONG DirRef;
 140
 141 /*
 142  * This utility structure is used to read/write the information in a directory
 143  * entry.
 144  */
 145 struct DirEntry
 146 {
 147   WCHAR          name[DIRENTRY_NAME_MAX_LEN];
 148   WORD           sizeOfNameString;
 149   BYTE           stgType;
 150   DirRef         leftChild;
 151   DirRef         rightChild;
 152   DirRef         dirRootEntry;
 153   GUID           clsid;
 154   FILETIME       ctime;
 155   FILETIME       mtime;
 156   ULONG          startingBlock;
 157   ULARGE_INTEGER size;
 158 };
 159
 160 HRESULT FileLockBytesImpl_Construct(HANDLE hFile, DWORD openFlags, LPCWSTR pwcsName, ILockBytes **pLockBytes);
 161
 162 /*************************************************************************
 163  * Ole Convert support
 164  */
 165
 166 HRESULT STORAGE_CreateOleStream(IStorage*, DWORD);
 167 HRESULT OLECONVERT_CreateCompObjStream(LPSTORAGE pStorage, LPCSTR strOleTypeName);
 168
 169 enum swmr_mode
 170 {
 171   SWMR_None,
 172   SWMR_Writer,
 173   SWMR_Reader
 174 };
 175
 176 /****************************************************************************
 177  * StorageBaseImpl definitions.
 178  *
 179  * This structure defines the base information contained in all implementations
 180  * of IStorage contained in this file storage implementation.
 181  *
 182  * In OOP terms, this is the base class for all the IStorage implementations
 183  * contained in this file.
 184  */
 185 struct StorageBaseImpl
 186 {
 187   IStorage IStorage_iface;
 188   IPropertySetStorage IPropertySetStorage_iface; /* interface for adding a properties stream */
 189   IDirectWriterLock IDirectWriterLock_iface;
 190   LONG ref;
 191
 192   /*
 193    * Stream tracking list
 194    */
 195
 196   struct list strmHead;
 197
 198   /*
 199    * Storage tracking list
 200    */
 201   struct list storageHead;
 202
 203   /*
 204    * TRUE if this object has been invalidated
 205    */
 206   BOOL reverted;
 207
 208   /*
 209    * Index of the directory entry of this storage
 210    */
 211   DirRef storageDirEntry;
 212
 213   /*
 214    * virtual methods.
 215    */
 216   const StorageBaseImplVtbl *baseVtbl;
 217
 218   /*
 219    * flags that this storage was opened or created with
 220    */
 221   DWORD openFlags;
 222
 223   /*
 224    * State bits appear to only be preserved while running. No in the stream
 225    */
 226   DWORD stateBits;
 227
 228   BOOL  create;     /* Was the storage created or opened.
 229                        The behaviour of STGM_SIMPLE depends on this */
 230   /*
 231    * If this storage was opened in transacted mode, the object that implements
 232    * the transacted snapshot or cache.
 233    */
 234   StorageBaseImpl *transactedChild;
 235   enum swmr_mode lockingrole;
 236 };
 237
 238 /* virtual methods for StorageBaseImpl objects */
 239 struct StorageBaseImplVtbl {
 240   void (*Destroy)(StorageBaseImpl*);
 241   void (*Invalidate)(StorageBaseImpl*);
 242   HRESULT (*Flush)(StorageBaseImpl*);
 243   HRESULT (*GetFilename)(StorageBaseImpl*,LPWSTR*);
 244   HRESULT (*CreateDirEntry)(StorageBaseImpl*,const DirEntry*,DirRef*);
 245   HRESULT (*WriteDirEntry)(StorageBaseImpl*,DirRef,const DirEntry*);
 246   HRESULT (*ReadDirEntry)(StorageBaseImpl*,DirRef,DirEntry*);
 247   HRESULT (*DestroyDirEntry)(StorageBaseImpl*,DirRef);
 248   HRESULT (*StreamReadAt)(StorageBaseImpl*,DirRef,ULARGE_INTEGER,ULONG,void*,ULONG*);
 249   HRESULT (*StreamWriteAt)(StorageBaseImpl*,DirRef,ULARGE_INTEGER,ULONG,const void*,ULONG*);
 250   HRESULT (*StreamSetSize)(StorageBaseImpl*,DirRef,ULARGE_INTEGER);
 251   HRESULT (*StreamLink)(StorageBaseImpl*,DirRef,DirRef);
 252   HRESULT (*GetTransactionSig)(StorageBaseImpl*,ULONG*,BOOL);
 253   HRESULT (*SetTransactionSig)(StorageBaseImpl*,ULONG);
 254   HRESULT (*LockTransaction)(StorageBaseImpl*,BOOL);
 255   HRESULT (*UnlockTransaction)(StorageBaseImpl*,BOOL);
 256 };
 257
 258 static inline void StorageBaseImpl_Destroy(StorageBaseImpl *This)
 259 {
 260   This->baseVtbl->Destroy(This);
 261 }
 262
 263 static inline void StorageBaseImpl_Invalidate(StorageBaseImpl *This)
 264 {
 265   This->baseVtbl->Invalidate(This);
 266 }
 267
 268 static inline HRESULT StorageBaseImpl_Flush(StorageBaseImpl *This)
 269 {
 270   return This->baseVtbl->Flush(This);
 271 }
 272
 273 static inline HRESULT StorageBaseImpl_GetFilename(StorageBaseImpl *This, LPWSTR *result)
 274 {
 275   return This->baseVtbl->GetFilename(This, result);
 276 }
 277
 278 static inline HRESULT StorageBaseImpl_CreateDirEntry(StorageBaseImpl *This,
 279   const DirEntry *newData, DirRef *index)
 280 {
 281   return This->baseVtbl->CreateDirEntry(This, newData, index);
 282 }
 283
 284 static inline HRESULT StorageBaseImpl_WriteDirEntry(StorageBaseImpl *This,
 285   DirRef index, const DirEntry *data)
 286 {
 287   return This->baseVtbl->WriteDirEntry(This, index, data);
 288 }
 289
 290 static inline HRESULT StorageBaseImpl_ReadDirEntry(StorageBaseImpl *This,
 291   DirRef index, DirEntry *data)
 292 {
 293   return This->baseVtbl->ReadDirEntry(This, index, data);
 294 }
 295
 296 static inline HRESULT StorageBaseImpl_DestroyDirEntry(StorageBaseImpl *This,
 297   DirRef index)
 298 {
 299   return This->baseVtbl->DestroyDirEntry(This, index);
 300 }
 301
 302 /* Read up to size bytes from this directory entry's stream at the given offset. */
 303 static inline HRESULT StorageBaseImpl_StreamReadAt(StorageBaseImpl *This,
 304   DirRef index, ULARGE_INTEGER offset, ULONG size, void *buffer, ULONG *bytesRead)
 305 {
 306   return This->baseVtbl->StreamReadAt(This, index, offset, size, buffer, bytesRead);
 307 }
 308
 309 /* Write size bytes to this directory entry's stream at the given offset,
 310  * growing the stream if necessary. */
 311 static inline HRESULT StorageBaseImpl_StreamWriteAt(StorageBaseImpl *This,
 312   DirRef index, ULARGE_INTEGER offset, ULONG size, const void *buffer, ULONG *bytesWritten)
 313 {
 314   return This->baseVtbl->StreamWriteAt(This, index, offset, size, buffer, bytesWritten);
 315 }
 316
 317 static inline HRESULT StorageBaseImpl_StreamSetSize(StorageBaseImpl *This,
 318   DirRef index, ULARGE_INTEGER newsize)
 319 {
 320   return This->baseVtbl->StreamSetSize(This, index, newsize);
 321 }
 322
 323 /* Make dst point to the same stream that src points to. Other stream operations
 324  * will not work properly for entries that point to the same stream, so this
 325  * must be a very temporary state, and only one entry pointing to a given stream
 326  * may be reachable at any given time. */
 327 static inline HRESULT StorageBaseImpl_StreamLink(StorageBaseImpl *This,
 328   DirRef dst, DirRef src)
 329 {
 330   return This->baseVtbl->StreamLink(This, dst, src);
 331 }
 332
 333 static inline HRESULT StorageBaseImpl_GetTransactionSig(StorageBaseImpl *This,
 334   ULONG* result, BOOL refresh)
 335 {
 336   return This->baseVtbl->GetTransactionSig(This, result, refresh);
 337 }
 338
 339 static inline HRESULT StorageBaseImpl_SetTransactionSig(StorageBaseImpl *This,
 340   ULONG value)
 341 {
 342   return This->baseVtbl->SetTransactionSig(This, value);
 343 }
 344
 345 static inline HRESULT StorageBaseImpl_LockTransaction(StorageBaseImpl *This, BOOL write)
 346 {
 347   return This->baseVtbl->LockTransaction(This, write);
 348 }
 349
 350 static inline HRESULT StorageBaseImpl_UnlockTransaction(StorageBaseImpl *This, BOOL write)
 351 {
 352   return This->baseVtbl->UnlockTransaction(This, write);
 353 }
 354
 355 /****************************************************************************
 356  * StorageBaseImpl stream list handlers
 357  */
 358
 359 void StorageBaseImpl_AddStream(StorageBaseImpl * stg, StgStreamImpl * strm);
 360 void StorageBaseImpl_RemoveStream(StorageBaseImpl * stg, StgStreamImpl * strm);
 361
 362 /* Number of BlockChainStream objects to cache in a StorageImpl */
 363 #define BLOCKCHAIN_CACHE_SIZE 4
 364
 365 /****************************************************************************
 366  * StorageImpl definitions.
 367  *
 368  * This implementation of the IStorage interface represents a root
 369  * storage. Basically, a document file.
 370  */
 371 struct StorageImpl
 372 {
 373   struct StorageBaseImpl base;
 374
 375   /*
 376    * File header
 377    */
 378   WORD  bigBlockSizeBits;
 379   WORD  smallBlockSizeBits;
 380   ULONG bigBlockSize;
 381   ULONG smallBlockSize;
 382   ULONG bigBlockDepotCount;
 383   ULONG rootStartBlock;
 384   ULONG smallBlockLimit;
 385   ULONG smallBlockDepotStart;
 386   ULONG extBigBlockDepotStart;
 387   ULONG *extBigBlockDepotLocations;
 388   ULONG extBigBlockDepotLocationsSize;
 389   ULONG extBigBlockDepotCount;
 390   ULONG bigBlockDepotStart[COUNT_BBDEPOTINHEADER];
 391   ULONG transactionSig;
 392
 393   ULONG extBlockDepotCached[MAX_BIG_BLOCK_SIZE / 4];
 394   ULONG indexExtBlockDepotCached;
 395
 396   ULONG blockDepotCached[MAX_BIG_BLOCK_SIZE / 4];
 397   ULONG indexBlockDepotCached;
 398   ULONG prevFreeBlock;
 399
 400   /* All small blocks before this one are known to be in use. */
 401   ULONG firstFreeSmallBlock;
 402
 403   /*
 404    * Abstraction of the big block chains for the chains of the header.
 405    */
 406   BlockChainStream* rootBlockChain;
 407   BlockChainStream* smallBlockDepotChain;
 408   BlockChainStream* smallBlockRootChain;
 409
 410   /* Cache of block chain streams objects for directory entries */
 411   BlockChainStream* blockChainCache[BLOCKCHAIN_CACHE_SIZE];
 412   UINT blockChainToEvict;
 413
 414   ULONG locks_supported;
 415
 416   ILockBytes* lockBytes;
 417
 418   ULONG locked_bytes[8];
 419 };
 420
 421 /****************************************************************************
 422  * StgStreamImpl definitions.
 423  *
 424  * This class implements the IStream interface and represents a stream
 425  * located inside a storage object.
 426  */
 427 struct StgStreamImpl
 428 {
 429   IStream IStream_iface;
 430   LONG ref;
 431
 432   /*
 433    * We are an entry in the storage object's stream handler list
 434    */
 435   struct list StrmListEntry;
 436
 437   /*
 438    * Storage that is the parent(owner) of the stream
 439    */
 440   StorageBaseImpl* parentStorage;
 441
 442   /*
 443    * Access mode of this stream.
 444    */
 445   DWORD grfMode;
 446
 447   /*
 448    * Index of the directory entry that owns (points to) this stream.
 449    */
 450   DirRef             dirEntry;
 451
 452   /*
 453    * This is the current position of the cursor in the stream
 454    */
 455   ULARGE_INTEGER     currentPosition;
 456 };
 457
 458 static inline StgStreamImpl *impl_from_IStream( IStream *iface )
 459 {
 460     return CONTAINING_RECORD(iface, StgStreamImpl, IStream_iface);
 461 }
 462
 463 /*
 464  * Method definition for the StgStreamImpl class.
 465  */
 466 StgStreamImpl* StgStreamImpl_Construct(
 467                 StorageBaseImpl* parentStorage,
 468     DWORD            grfMode,
 469     DirRef           dirEntry);
 470
 471
 472 /* Range lock constants.
 473  *
 474  * The storage format reserves the region from 0x7fffff00-0x7fffffff for
 475  * locking and synchronization. Because it reserves the entire block containing
 476  * that range, and the minimum block size is 512 bytes, 0x7ffffe00-0x7ffffeff
 477  * also cannot be used for any other purpose.
 478  * Unfortunately, the spec doesn't say which bytes
 479  * within that range are used, and for what. These are guesses based on testing.
 480  * In particular, ends of ranges may be wrong.
 481
 482  0x0 through 0x57: Unknown. Causes read-only exclusive opens to fail.
 483  0x58 through 0x6b: Priority mode.
 484  0x6c through 0x7f: No snapshot mode.
 485  0x80: Commit lock.
 486  0x81 through 0x91: Priority mode, again. Not sure why it uses two regions.
 487  0x92: Lock-checking lock. Held while opening so ranges can be tested without
 488   causing spurious failures if others try to grab or test those ranges at the
 489   same time.
 490  0x93 through 0xa6: Read mode.
 491  0xa7 through 0xba: Write mode.
 492  0xbb through 0xce: Deny read.
 493  0xcf through 0xe2: Deny write.
 494  0xe2 through 0xff: Unknown. Causes read-only exclusive opens to fail.
 495 */
 496
 497 #define RANGELOCK_UNK1_FIRST            0x7ffffe00
 498 #define RANGELOCK_UNK1_LAST             0x7fffff57
 499 #define RANGELOCK_PRIORITY1_FIRST       0x7fffff58
 500 #define RANGELOCK_PRIORITY1_LAST        0x7fffff6b
 501 #define RANGELOCK_NOSNAPSHOT_FIRST      0x7fffff6c
 502 #define RANGELOCK_NOSNAPSHOT_LAST       0x7fffff7f
 503 #define RANGELOCK_COMMIT                0x7fffff80
 504 #define RANGELOCK_PRIORITY2_FIRST       0x7fffff81
 505 #define RANGELOCK_PRIORITY2_LAST        0x7fffff91
 506 #define RANGELOCK_CHECKLOCKS            0x7fffff92
 507 #define RANGELOCK_READ_FIRST            0x7fffff93
 508 #define RANGELOCK_READ_LAST             0x7fffffa6
 509 #define RANGELOCK_WRITE_FIRST           0x7fffffa7
 510 #define RANGELOCK_WRITE_LAST            0x7fffffba
 511 #define RANGELOCK_DENY_READ_FIRST       0x7fffffbb
 512 #define RANGELOCK_DENY_READ_LAST        0x7fffffce
 513 #define RANGELOCK_DENY_WRITE_FIRST      0x7fffffcf
 514 #define RANGELOCK_DENY_WRITE_LAST       0x7fffffe2
 515 #define RANGELOCK_UNK2_FIRST            0x7fffffe3
 516 #define RANGELOCK_UNK2_LAST             0x7fffffff
 517 #define RANGELOCK_TRANSACTION_FIRST     RANGELOCK_COMMIT
 518 #define RANGELOCK_TRANSACTION_LAST      RANGELOCK_CHECKLOCKS
 519 #define RANGELOCK_FIRST                 RANGELOCK_UNK1_FIRST
 520 #define RANGELOCK_LAST                  RANGELOCK_UNK2_LAST
 521
 522 /* internal value for LockRegion/UnlockRegion */
 523 #define WINE_LOCK_READ                  0x80000000
 524
 525
 526 /******************************************************************************
 527  * Endian conversion macros
 528  */
 529 #ifdef WORDS_BIGENDIAN
 530
 531 #ifndef htole32
 532 #define htole32(x) RtlUlongByteSwap(x)
 533 #endif
 534 #ifndef htole16
 535 #define htole16(x) RtlUshortByteSwap(x)
 536 #endif
 537 #define lendian32toh(x) RtlUlongByteSwap(x)
 538 #define lendian16toh(x) RtlUshortByteSwap(x)
 539
 540 #else
 541
 542 #ifndef htole32
 543 #define htole32(x) (x)
 544 #endif
 545 #ifndef htole16
 546 #define htole16(x) (x)
 547 #endif
 548 #define lendian32toh(x) (x)
 549 #define lendian16toh(x) (x)
 550
 551 #endif
 552
 553 /******************************************************************************
 554  * The StorageUtl_ functions are miscellaneous utility functions. Most of which
 555  * are abstractions used to read values from file buffers without having to
 556  * worry about bit order
 557  */
 558 void StorageUtl_ReadWord(const BYTE* buffer, ULONG offset, WORD* value);
 559 void StorageUtl_WriteWord(void *buffer, ULONG offset, WORD value);
 560 void StorageUtl_ReadDWord(const BYTE* buffer, ULONG offset, DWORD* value);
 561 void StorageUtl_WriteDWord(void *buffer, ULONG offset, DWORD value);
 562 void StorageUtl_ReadULargeInteger(const BYTE* buffer, ULONG offset,
 563  ULARGE_INTEGER* value);
 564 void StorageUtl_WriteULargeInteger(void *buffer, ULONG offset, const ULARGE_INTEGER *value);
 565 void StorageUtl_ReadGUID(const BYTE* buffer, ULONG offset, GUID* value);
 566 void StorageUtl_WriteGUID(void *buffer, ULONG offset, const GUID* value);
 567 void StorageUtl_CopyDirEntryToSTATSTG(StorageBaseImpl *storage,STATSTG* destination,
 568  const DirEntry* source, int statFlags);
 569
 570
 571 #endif /* __STORAGE32_H__ */