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storage32.h

/*
 * Compound Storage (32 bit version)
 *
 * Implemented using the documentation of the LAOLA project at
 * <URL:http://wwwwbs.cs.tu-berlin.de/~schwartz/pmh/index.html>
 * (Thanks to Martin Schwartz <schwartz@cs.tu-berlin.de>)
 *
 * This include file contains definitions of types and function
 * prototypes that are used in the many files implementing the
 * storage functionality
 *
 * Copyright 1998,1999 Francis Beaudet
 * Copyright 1998,1999 Thuy Nguyen
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __STORAGE32_H__
#define __STORAGE32_H__

#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "objbase.h"

/*
 * Definitions for the file format offsets.
 */
static const ULONG OFFSET_BIGBLOCKSIZEBITS   = 0x0000001e;
static const ULONG OFFSET_SMALLBLOCKSIZEBITS = 0x00000020;
static const ULONG OFFSET_BBDEPOTCOUNT         = 0x0000002C;
static const ULONG OFFSET_ROOTSTARTBLOCK     = 0x00000030;
static const ULONG OFFSET_SBDEPOTSTART         = 0x0000003C;
static const ULONG OFFSET_SBDEPOTCOUNT       = 0x00000040;
static const ULONG OFFSET_EXTBBDEPOTSTART    = 0x00000044;
static const ULONG OFFSET_EXTBBDEPOTCOUNT    = 0x00000048;
static const ULONG OFFSET_BBDEPOTSTART         = 0x0000004C;
static const ULONG OFFSET_PS_NAME            = 0x00000000;
static const ULONG OFFSET_PS_NAMELENGTH        = 0x00000040;
static const ULONG OFFSET_PS_PROPERTYTYPE    = 0x00000042;
static const ULONG OFFSET_PS_PREVIOUSPROP    = 0x00000044;
static const ULONG OFFSET_PS_NEXTPROP        = 0x00000048;
static const ULONG OFFSET_PS_DIRPROP           = 0x0000004C;
static const ULONG OFFSET_PS_GUID            = 0x00000050;
static const ULONG OFFSET_PS_TSS1        = 0x00000064;
static const ULONG OFFSET_PS_TSD1            = 0x00000068;
static const ULONG OFFSET_PS_TSS2            = 0x0000006C;
static const ULONG OFFSET_PS_TSD2            = 0x00000070;
static const ULONG OFFSET_PS_STARTBLOCK        = 0x00000074;
static const ULONG OFFSET_PS_SIZE        = 0x00000078;
static const WORD  DEF_BIG_BLOCK_SIZE_BITS   = 0x0009;
static const WORD  DEF_SMALL_BLOCK_SIZE_BITS = 0x0006;
static const WORD  DEF_BIG_BLOCK_SIZE        = 0x0200;
static const WORD  DEF_SMALL_BLOCK_SIZE      = 0x0040;
static const ULONG BLOCK_EXTBBDEPOT          = 0xFFFFFFFC;
static const ULONG BLOCK_SPECIAL             = 0xFFFFFFFD;
static const ULONG BLOCK_END_OF_CHAIN        = 0xFFFFFFFE;
static const ULONG BLOCK_UNUSED              = 0xFFFFFFFF;
static const ULONG PROPERTY_NULL             = 0xFFFFFFFF;

#define PROPERTY_NAME_MAX_LEN    0x20
#define PROPERTY_NAME_BUFFER_LEN 0x40

#define PROPSET_BLOCK_SIZE 0x00000080

/*
 * Property type of relation
 */
#define PROPERTY_RELATION_PREVIOUS 0
#define PROPERTY_RELATION_NEXT     1
#define PROPERTY_RELATION_DIR      2

/*
 * Property type constants
 */
#define PROPTYPE_STORAGE 0x01
#define PROPTYPE_STREAM  0x02
#define PROPTYPE_ROOT    0x05

/*
 * These defines assume a hardcoded blocksize. The code will assert
 * if the blocksize is different. Some changes will have to be done if it
 * becomes the case.
 */
#define BIG_BLOCK_SIZE           0x200
#define COUNT_BBDEPOTINHEADER    109
#define LIMIT_TO_USE_SMALL_BLOCK 0x1000
#define NUM_BLOCKS_PER_DEPOT_BLOCK 128

#define STGM_ACCESS_MODE(stgm)   ((stgm)&0x0000f)
#define STGM_SHARE_MODE(stgm)    ((stgm)&0x000f0)
#define STGM_CREATE_MODE(stgm)   ((stgm)&0x0f000)

#define STGM_KNOWN_FLAGS (0xf0ff | \
     STGM_TRANSACTED | STGM_CONVERT | STGM_PRIORITY | STGM_NOSCRATCH | \
     STGM_NOSNAPSHOT | STGM_DIRECT_SWMR | STGM_DELETEONRELEASE | STGM_SIMPLE)

/*
 * These are signatures to detect the type of Document file.
 */
static const BYTE STORAGE_magic[8]    ={0xd0,0xcf,0x11,0xe0,0xa1,0xb1,0x1a,0xe1};
static const BYTE STORAGE_oldmagic[8] ={0xd0,0xcf,0x11,0xe0,0x0e,0x11,0xfc,0x0d};

/*
 * Forward declarations of all the structures used by the storage
 * module.
 */
typedef struct StorageBaseImpl     StorageBaseImpl;
typedef struct StorageImpl         StorageImpl;
typedef struct StorageInternalImpl StorageInternalImpl;
typedef struct BlockChainStream      BlockChainStream;
typedef struct SmallBlockChainStream SmallBlockChainStream;
typedef struct IEnumSTATSTGImpl      IEnumSTATSTGImpl;
typedef struct StgProperty           StgProperty;
typedef struct StgStreamImpl         StgStreamImpl;

/*
 * This utility structure is used to read/write the information in a storage
 * property.
 */
struct StgProperty
{
  WCHAR              name[PROPERTY_NAME_MAX_LEN];
  WORD               sizeOfNameString;
  BYTE               propertyType;
  ULONG              previousProperty;
  ULONG              nextProperty;
  ULONG          dirProperty;
  GUID           propertyUniqueID;
  ULONG          timeStampS1;
  ULONG          timeStampD1;
  ULONG          timeStampS2;
  ULONG          timeStampD2;
  ULONG          startingBlock;
  ULARGE_INTEGER size;
};

/*************************************************************************
 * Big Block File support
 *
 * The big block file is an abstraction of a flat file separated in
 * same sized blocks. The implementation for the methods described in
 * this section appear in stg_bigblockfile.c
 */

/*
 * Declaration of the data structures
 */
typedef struct BigBlockFile BigBlockFile,*LPBIGBLOCKFILE;
typedef struct MappedPage   MappedPage,*LPMAPPEDPAGE;

struct BigBlockFile
{
  BOOL fileBased;
  ULARGE_INTEGER filesize;
  ULONG blocksize;
  HANDLE hfile;
  HANDLE hfilemap;
  DWORD flProtect;
  MappedPage *maplist;
  MappedPage *victimhead, *victimtail;
  ULONG num_victim_pages;
  ILockBytes *pLkbyt;
  HGLOBAL hbytearray;
  LPVOID pbytearray;
};

/*
 * Declaration of the functions used to manipulate the BigBlockFile
 * data structure.
 */
BigBlockFile*  BIGBLOCKFILE_Construct(HANDLE hFile,
                                      ILockBytes* pLkByt,
                                      DWORD openFlags,
                                      ULONG blocksize,
                                      BOOL fileBased);
void           BIGBLOCKFILE_Destructor(LPBIGBLOCKFILE This);
void*          BIGBLOCKFILE_GetBigBlock(LPBIGBLOCKFILE This, ULONG index);
void*          BIGBLOCKFILE_GetROBigBlock(LPBIGBLOCKFILE This, ULONG index);
void           BIGBLOCKFILE_ReleaseBigBlock(LPBIGBLOCKFILE This, void *pBlock);
void           BIGBLOCKFILE_SetSize(LPBIGBLOCKFILE This, ULARGE_INTEGER newSize);
ULARGE_INTEGER BIGBLOCKFILE_GetSize(LPBIGBLOCKFILE This);

/*************************************************************************
 * Ole Convert support
 */

void OLECONVERT_CreateOleStream(LPSTORAGE pStorage);
HRESULT OLECONVERT_CreateCompObjStream(LPSTORAGE pStorage, LPCSTR strOleTypeName);

/****************************************************************************
 * Storage32BaseImpl definitions.
 *
 * This structure defines the base information contained in all implementations
 * of IStorage32 contained in this file storage implementation.
 *
 * In OOP terms, this is the base class for all the IStorage32 implementations
 * contained in this file.
 */
struct StorageBaseImpl
{
  IStorageVtbl *lpVtbl;    /* Needs to be the first item in the struct
                      * since we want to cast this in a Storage32 pointer */

  IPropertySetStorageVtbl *pssVtbl; /* interface for adding a properties stream */

  /*
   * Reference count of this object
   */
  ULONG ref;

  /*
   * Ancestor storage (top level)
   */
  StorageImpl* ancestorStorage;

  /*
   * Index of the property for the root of
   * this storage
   */
  ULONG rootPropertySetIndex;

  /*
   * virtual Destructor method.
   */
  void (*v_destructor)(StorageBaseImpl*);
};


/*
 * Prototypes for the methods of the Storage32BaseImpl class.
 */
HRESULT WINAPI StorageBaseImpl_QueryInterface(
            IStorage*        iface,
            REFIID             riid,
            void**             ppvObject);

ULONG WINAPI StorageBaseImpl_AddRef(
            IStorage*        iface);

ULONG WINAPI StorageBaseImpl_Release(
            IStorage*        iface);

HRESULT WINAPI StorageBaseImpl_OpenStream(
            IStorage*        iface,
            const OLECHAR*   pwcsName,  /* [string][in] */
            void*              reserved1, /* [unique][in] */
            DWORD              grfMode,   /* [in] */
            DWORD              reserved2, /* [in] */
            IStream**        ppstm);    /* [out] */

HRESULT WINAPI StorageBaseImpl_OpenStorage(
            IStorage*        iface,
            const OLECHAR*   pwcsName,      /* [string][unique][in] */
            IStorage*        pstgPriority,  /* [unique][in] */
            DWORD              grfMode,       /* [in] */
            SNB              snbExclude,    /* [unique][in] */
            DWORD              reserved,      /* [in] */
            IStorage**       ppstg);        /* [out] */

HRESULT WINAPI StorageBaseImpl_EnumElements(
            IStorage*        iface,
            DWORD              reserved1, /* [in] */
            void*              reserved2, /* [size_is][unique][in] */
            DWORD              reserved3, /* [in] */
            IEnumSTATSTG**     ppenum);   /* [out] */

HRESULT WINAPI StorageBaseImpl_Stat(
            IStorage*        iface,
            STATSTG*           pstatstg,     /* [out] */
            DWORD              grfStatFlag); /* [in] */

HRESULT WINAPI StorageBaseImpl_RenameElement(
            IStorage*        iface,
            const OLECHAR*   pwcsOldName,  /* [string][in] */
            const OLECHAR*   pwcsNewName); /* [string][in] */

HRESULT WINAPI StorageBaseImpl_CreateStream(
            IStorage*        iface,
            const OLECHAR*   pwcsName,  /* [string][in] */
            DWORD              grfMode,   /* [in] */
            DWORD              reserved1, /* [in] */
            DWORD              reserved2, /* [in] */
            IStream**        ppstm);    /* [out] */

HRESULT WINAPI StorageBaseImpl_SetClass(
            IStorage*        iface,
            REFCLSID           clsid);  /* [in] */

/****************************************************************************
 * Storage32Impl definitions.
 *
 * This implementation of the IStorage32 interface represents a root
 * storage. Basically, a document file.
 */
struct StorageImpl
{
  struct StorageBaseImpl base;

  /*
   * The following data members are specific to the Storage32Impl
   * class
   */
  HANDLE           hFile;      /* Physical support for the Docfile */
  LPOLESTR         pwcsName;   /* Full path of the document file */

  /* FIXME: should this be in Storage32BaseImpl ? */
  WCHAR            filename[PROPERTY_NAME_BUFFER_LEN];

  /*
   * File header
   */
  WORD  bigBlockSizeBits;
  WORD  smallBlockSizeBits;
  ULONG bigBlockSize;
  ULONG smallBlockSize;
  ULONG bigBlockDepotCount;
  ULONG rootStartBlock;
  ULONG smallBlockDepotStart;
  ULONG extBigBlockDepotStart;
  ULONG extBigBlockDepotCount;
  ULONG bigBlockDepotStart[COUNT_BBDEPOTINHEADER];

  ULONG blockDepotCached[NUM_BLOCKS_PER_DEPOT_BLOCK];
  ULONG indexBlockDepotCached;
  ULONG prevFreeBlock;

  /*
   * Abstraction of the big block chains for the chains of the header.
   */
  BlockChainStream* rootBlockChain;
  BlockChainStream* smallBlockDepotChain;
  BlockChainStream* smallBlockRootChain;

  /*
   * Pointer to the big block file abstraction
   */
  BigBlockFile* bigBlockFile;
};

/*
 * Method declaration for the Storage32Impl class
 */

HRESULT WINAPI StorageImpl_CreateStorage(
            IStorage*      iface,
            const OLECHAR* pwcsName,  /* [string][in] */
            DWORD            grfMode,   /* [in] */
            DWORD            dwStgFmt,  /* [in] */
            DWORD            reserved2, /* [in] */
            IStorage**     ppstg);    /* [out] */

HRESULT WINAPI StorageImpl_CopyTo(
            IStorage*      iface,
            DWORD          ciidExclude,  /* [in] */
            const IID*     rgiidExclude, /* [size_is][unique][in] */
            SNB            snbExclude, /* [unique][in] */
            IStorage*    pstgDest);    /* [unique][in] */

HRESULT WINAPI StorageImpl_MoveElementTo(
            IStorage*      iface,
            const OLECHAR* pwcsName,    /* [string][in] */
            IStorage*      pstgDest,    /* [unique][in] */
            const OLECHAR* pwcsNewName, /* [string][in] */
            DWORD            grfFlags);   /* [in] */

HRESULT WINAPI StorageImpl_Commit(
            IStorage*      iface,
            DWORD          grfCommitFlags); /* [in] */

HRESULT WINAPI StorageImpl_Revert(
            IStorage*      iface);

HRESULT WINAPI StorageImpl_DestroyElement(
            IStorage*      iface,
            const OLECHAR* pwcsName); /* [string][in] */

HRESULT WINAPI StorageImpl_SetElementTimes(
            IStorage*      iface,
            const OLECHAR* pwcsName, /* [string][in] */
            const FILETIME*  pctime,   /* [in] */
            const FILETIME*  patime,   /* [in] */
            const FILETIME*  pmtime);  /* [in] */

HRESULT WINAPI StorageImpl_SetStateBits(
            IStorage*      iface,
            DWORD          grfStateBits, /* [in] */
            DWORD          grfMask);     /* [in] */

HRESULT WINAPI StorageImpl_Stat(IStorage* iface,
                                STATSTG*  pstatstg,     /* [out] */
                                DWORD     grfStatFlag); /* [in] */

void StorageImpl_Destroy(
          StorageBaseImpl* This);

HRESULT StorageImpl_Construct(
            StorageImpl* This,
            HANDLE       hFile,
            LPCOLESTR    pwcsName,
            ILockBytes*  pLkbyt,
            DWORD        openFlags,
            BOOL         fileBased,
            BOOL         fileCreate);

BOOL StorageImpl_ReadBigBlock(
            StorageImpl* This,
          ULONG          blockIndex,
          void*          buffer);

BOOL StorageImpl_WriteBigBlock(
            StorageImpl* This,
          ULONG          blockIndex,
          void*          buffer);

void* StorageImpl_GetROBigBlock(
            StorageImpl* This,
          ULONG          blockIndex);

void* StorageImpl_GetBigBlock(
          StorageImpl* This,
          ULONG          blockIndex);

void StorageImpl_ReleaseBigBlock(
            StorageImpl* This,
            void*          pBigBlock);

ULONG StorageImpl_GetNextFreeBigBlock(
            StorageImpl* This);

void StorageImpl_FreeBigBlock(
            StorageImpl* This,
          ULONG blockIndex);

HRESULT StorageImpl_GetNextBlockInChain(
            StorageImpl* This,
          ULONG blockIndex,
          ULONG* nextBlockIndex);

void StorageImpl_SetNextBlockInChain(
            StorageImpl* This,
          ULONG blockIndex,
          ULONG nextBlock);

HRESULT StorageImpl_LoadFileHeader(
          StorageImpl* This);

void StorageImpl_SaveFileHeader(
            StorageImpl* This);

BOOL StorageImpl_ReadProperty(
            StorageImpl* This,
          ULONG          index,
          StgProperty*    buffer);

BOOL StorageImpl_WriteProperty(
            StorageImpl* This,
          ULONG          index,
          StgProperty*   buffer);

BlockChainStream* Storage32Impl_SmallBlocksToBigBlocks(
                      StorageImpl* This,
                      SmallBlockChainStream** ppsbChain);

ULONG Storage32Impl_GetNextExtendedBlock(StorageImpl* This,
                                         ULONG blockIndex);

void Storage32Impl_AddBlockDepot(StorageImpl* This,
                                 ULONG blockIndex);

ULONG Storage32Impl_AddExtBlockDepot(StorageImpl* This);

ULONG Storage32Impl_GetExtDepotBlock(StorageImpl* This,
                                     ULONG depotIndex);

void Storage32Impl_SetExtDepotBlock(StorageImpl* This,
                                    ULONG depotIndex,
                                    ULONG blockIndex);
/****************************************************************************
 * Storage32InternalImpl definitions.
 *
 * Definition of the implementation structure for the IStorage32 interface.
 * This one implements the IStorage32 interface for storage that are
 * inside another storage.
 */
struct StorageInternalImpl
{
  struct StorageBaseImpl base;

  /*
   * There is no specific data for this class.
   */
};

/*
 * Method definitions for the Storage32InternalImpl class.
 */
StorageInternalImpl* StorageInternalImpl_Construct(
          StorageImpl* ancestorStorage,
          ULONG          rootTropertyIndex);

void StorageInternalImpl_Destroy(
                StorageBaseImpl* This);

HRESULT WINAPI StorageInternalImpl_Commit(
          IStorage*            iface,
          DWORD                  grfCommitFlags); /* [in] */

HRESULT WINAPI StorageInternalImpl_Revert(
          IStorage*            iface);


/****************************************************************************
 * IEnumSTATSTGImpl definitions.
 *
 * Definition of the implementation structure for the IEnumSTATSTGImpl interface.
 * This class allows iterating through the content of a storage and to find
 * specific items inside it.
 */
struct IEnumSTATSTGImpl
{
  IEnumSTATSTGVtbl *lpVtbl;    /* Needs to be the first item in the struct
                        * since we want to cast this in a IEnumSTATSTG pointer */

  ULONG            ref;               /* Reference count */
  StorageImpl* parentStorage;         /* Reference to the parent storage */
  ULONG          firstPropertyNode;     /* Index of the root of the storage to enumerate */

  /*
   * The current implementation of the IEnumSTATSTGImpl class uses a stack
   * to walk the property sets to get the content of a storage. This stack
   * is implemented by the following 3 data members
   */
  ULONG          stackSize;
  ULONG          stackMaxSize;
  ULONG*         stackToVisit;

#define ENUMSTATSGT_SIZE_INCREMENT 10
};

/*
 * Method definitions for the IEnumSTATSTGImpl class.
 */
HRESULT WINAPI IEnumSTATSTGImpl_QueryInterface(
          IEnumSTATSTG*     iface,
          REFIID            riid,
          void**            ppvObject);

ULONG WINAPI IEnumSTATSTGImpl_AddRef(
            IEnumSTATSTG*     iface);

ULONG WINAPI IEnumSTATSTGImpl_Release(
            IEnumSTATSTG*     iface);

HRESULT WINAPI IEnumSTATSTGImpl_Next(
            IEnumSTATSTG*     iface,
          ULONG             celt,
          STATSTG*          rgelt,
          ULONG*            pceltFetched);

HRESULT WINAPI IEnumSTATSTGImpl_Skip(
            IEnumSTATSTG*     iface,
          ULONG             celt);

HRESULT WINAPI IEnumSTATSTGImpl_Reset(
            IEnumSTATSTG* iface);

HRESULT WINAPI IEnumSTATSTGImpl_Clone(
            IEnumSTATSTG*     iface,
          IEnumSTATSTG**    ppenum);

IEnumSTATSTGImpl* IEnumSTATSTGImpl_Construct(
            StorageImpl* This,
          ULONG          firstPropertyNode);

void IEnumSTATSTGImpl_Destroy(
            IEnumSTATSTGImpl* This);

void IEnumSTATSTGImpl_PushSearchNode(
          IEnumSTATSTGImpl* This,
          ULONG             nodeToPush);

ULONG IEnumSTATSTGImpl_PopSearchNode(
            IEnumSTATSTGImpl* This,
          BOOL            remove);

ULONG IEnumSTATSTGImpl_FindProperty(
            IEnumSTATSTGImpl* This,
          const OLECHAR*  lpszPropName,
          StgProperty*      buffer);

INT IEnumSTATSTGImpl_FindParentProperty(
  IEnumSTATSTGImpl *This,
  ULONG             childProperty,
  StgProperty      *currentProperty,
  ULONG            *propertyId);


/****************************************************************************
 * StgStreamImpl definitions.
 *
 * This class imlements the IStream32 inteface and represents a stream
 * located inside a storage object.
 */
struct StgStreamImpl
{
  IStreamVtbl *lpVtbl;  /* Needs to be the first item in the struct
                   * since we want to cast this in a IStream pointer */

  /*
   * Reference count
   */
  ULONG                ref;

  /*
   * Storage that is the parent(owner) of the stream
   */
  StorageBaseImpl* parentStorage;

  /*
   * Access mode of this stream.
   */
  DWORD grfMode;

  /*
   * Index of the property that owns (points to) this stream.
   */
  ULONG              ownerProperty;

  /*
   * Helper variable that contains the size of the stream
   */
  ULARGE_INTEGER     streamSize;

  /*
   * This is the current position of the cursor in the stream
   */
  ULARGE_INTEGER     currentPosition;

  /*
   * The information in the stream is represented by a chain of small blocks
   * or a chain of large blocks. Depending on the case, one of the two
   * following variabled points to that information.
   */
  BlockChainStream*      bigBlockChain;
  SmallBlockChainStream* smallBlockChain;
};

/*
 * Method definition for the StgStreamImpl class.
 */
StgStreamImpl* StgStreamImpl_Construct(
            StorageBaseImpl* parentStorage,
    DWORD            grfMode,
    ULONG            ownerProperty);

void StgStreamImpl_Destroy(
                StgStreamImpl* This);

void StgStreamImpl_OpenBlockChain(
                StgStreamImpl* This);

HRESULT WINAPI StgStreamImpl_QueryInterface(
            IStream*      iface,
            REFIID         riid,          /* [in] */
            void**         ppvObject);  /* [iid_is][out] */

ULONG WINAPI StgStreamImpl_AddRef(
            IStream*      iface);

ULONG WINAPI StgStreamImpl_Release(
            IStream*      iface);

HRESULT WINAPI StgStreamImpl_Read(
              IStream*      iface,
            void*          pv,        /* [length_is][size_is][out] */
            ULONG          cb,        /* [in] */
            ULONG*         pcbRead);  /* [out] */

HRESULT WINAPI StgStreamImpl_Write(
            IStream*      iface,
            const void*    pv,          /* [size_is][in] */
            ULONG          cb,          /* [in] */
            ULONG*         pcbWritten); /* [out] */

HRESULT WINAPI StgStreamImpl_Seek(
            IStream*      iface,
            LARGE_INTEGER   dlibMove,         /* [in] */
            DWORD           dwOrigin,         /* [in] */
            ULARGE_INTEGER* plibNewPosition); /* [out] */

HRESULT WINAPI StgStreamImpl_SetSize(
              IStream*      iface,
            ULARGE_INTEGER  libNewSize);  /* [in] */

HRESULT WINAPI StgStreamImpl_CopyTo(
            IStream*      iface,
            IStream*      pstm,         /* [unique][in] */
            ULARGE_INTEGER  cb,           /* [in] */
            ULARGE_INTEGER* pcbRead,      /* [out] */
            ULARGE_INTEGER* pcbWritten);  /* [out] */

HRESULT WINAPI StgStreamImpl_Commit(
            IStream*      iface,
            DWORD           grfCommitFlags); /* [in] */

HRESULT WINAPI StgStreamImpl_Revert(
            IStream*  iface);

HRESULT WINAPI StgStreamImpl_LockRegion(
            IStream*     iface,
            ULARGE_INTEGER libOffset,   /* [in] */
            ULARGE_INTEGER cb,          /* [in] */
            DWORD          dwLockType); /* [in] */

HRESULT WINAPI StgStreamImpl_UnlockRegion(
            IStream*     iface,
            ULARGE_INTEGER libOffset,   /* [in] */
              ULARGE_INTEGER cb,          /* [in] */
            DWORD          dwLockType); /* [in] */

HRESULT WINAPI StgStreamImpl_Stat(
            IStream*     iface,
              STATSTG*       pstatstg,     /* [out] */
              DWORD          grfStatFlag); /* [in] */

HRESULT WINAPI StgStreamImpl_Clone(
            IStream*     iface,
            IStream**    ppstm);       /* [out] */


/********************************************************************************
 * The StorageUtl_ functions are miscelaneous utility functions. Most of which are
 * abstractions used to read values from file buffers without having to worry
 * about bit order
 */
void StorageUtl_ReadWord(void* buffer, ULONG offset, WORD* value);
void StorageUtl_WriteWord(void* buffer, ULONG offset, WORD value);
void StorageUtl_ReadDWord(void* buffer, ULONG offset, DWORD* value);
void StorageUtl_WriteDWord(void* buffer, ULONG offset, DWORD value);
void StorageUtl_ReadGUID(void* buffer, ULONG offset, GUID* value);
void StorageUtl_WriteGUID(void* buffer, ULONG offset, GUID* value);
void StorageUtl_CopyPropertyToSTATSTG(STATSTG*     destination,
                                   StgProperty* source,
                                   int          statFlags);

/****************************************************************************
 * BlockChainStream definitions.
 *
 * The BlockChainStream class is a utility class that is used to create an
 * abstraction of the big block chains in the storage file.
 */
struct BlockChainStream
{
  StorageImpl* parentStorage;
  ULONG*       headOfStreamPlaceHolder;
  ULONG        ownerPropertyIndex;
  ULONG        lastBlockNoInSequence;
  ULONG        lastBlockNoInSequenceIndex;
  ULONG        tailIndex;
  ULONG        numBlocks;
};

/*
 * Methods for the BlockChainStream class.
 */
BlockChainStream* BlockChainStream_Construct(
            StorageImpl* parentStorage,
            ULONG*         headOfStreamPlaceHolder,
            ULONG          propertyIndex);

void BlockChainStream_Destroy(
            BlockChainStream* This);

ULONG BlockChainStream_GetHeadOfChain(
            BlockChainStream* This);

BOOL BlockChainStream_ReadAt(
            BlockChainStream* This,
            ULARGE_INTEGER offset,
            ULONG          size,
            void*          buffer,
            ULONG*         bytesRead);

BOOL BlockChainStream_WriteAt(
            BlockChainStream* This,
            ULARGE_INTEGER offset,
            ULONG          size,
            const void*    buffer,
            ULONG*         bytesWritten);

BOOL BlockChainStream_SetSize(
            BlockChainStream* This,
            ULARGE_INTEGER    newSize);

ULARGE_INTEGER BlockChainStream_GetSize(
    BlockChainStream* This);

ULONG BlockChainStream_GetCount(
    BlockChainStream* This);

/****************************************************************************
 * SmallBlockChainStream definitions.
 *
 * The SmallBlockChainStream class is a utility class that is used to create an
 * abstraction of the small block chains in the storage file.
 */
struct SmallBlockChainStream
{
  StorageImpl* parentStorage;
  ULONG          ownerPropertyIndex;
};

/*
 * Methods of the SmallBlockChainStream class.
 */
SmallBlockChainStream* SmallBlockChainStream_Construct(
             StorageImpl* parentStorage,
             ULONG          propertyIndex);

void SmallBlockChainStream_Destroy(
             SmallBlockChainStream* This);

ULONG SmallBlockChainStream_GetHeadOfChain(
             SmallBlockChainStream* This);

HRESULT SmallBlockChainStream_GetNextBlockInChain(
             SmallBlockChainStream* This,
             ULONG                  blockIndex,
             ULONG*                 nextBlockIndex);

void SmallBlockChainStream_SetNextBlockInChain(
         SmallBlockChainStream* This,
         ULONG                  blockIndex,
         ULONG                  nextBlock);

void SmallBlockChainStream_FreeBlock(
         SmallBlockChainStream* This,
         ULONG                  blockIndex);

ULONG SmallBlockChainStream_GetNextFreeBlock(
         SmallBlockChainStream* This);

BOOL SmallBlockChainStream_ReadAt(
             SmallBlockChainStream* This,
             ULARGE_INTEGER offset,
             ULONG          size,
             void*          buffer,
             ULONG*         bytesRead);

BOOL SmallBlockChainStream_WriteAt(
             SmallBlockChainStream* This,
             ULARGE_INTEGER offset,
             ULONG          size,
             const void*    buffer,
             ULONG*         bytesWritten);

BOOL SmallBlockChainStream_SetSize(
             SmallBlockChainStream* This,
             ULARGE_INTEGER          newSize);

ULARGE_INTEGER SmallBlockChainStream_GetSize(
         SmallBlockChainStream* This);

ULONG SmallBlockChainStream_GetCount(
         SmallBlockChainStream* This);


#endif /* __STORAGE32_H__ */

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