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/*
* 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
* Copyright 2010 Vincent Povirk for CodeWeavers
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __STORAGE32_H__
#define __STORAGE32_H__
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "objbase.h"
#include "winreg.h"
#include "winternl.h"
#include "wine/list.h"
/*
* Definitions for the file format offsets.
*/
static const ULONG OFFSET_MINORVERSION = 0x00000018;
static const ULONG OFFSET_MAJORVERSION = 0x0000001a;
static const ULONG OFFSET_BYTEORDERMARKER = 0x0000001c;
static const ULONG OFFSET_BIGBLOCKSIZEBITS = 0x0000001e;
static const ULONG OFFSET_SMALLBLOCKSIZEBITS = 0x00000020;
static const ULONG OFFSET_DIRSECTORCOUNT = 0x00000028;
static const ULONG OFFSET_BBDEPOTCOUNT = 0x0000002C;
static const ULONG OFFSET_ROOTSTARTBLOCK = 0x00000030;
static const ULONG OFFSET_TRANSACTIONSIG = 0x00000034;
static const ULONG OFFSET_SMALLBLOCKLIMIT = 0x00000038;
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_STGTYPE = 0x00000042;
static const ULONG OFFSET_PS_LEFTCHILD = 0x00000044;
static const ULONG OFFSET_PS_RIGHTCHILD = 0x00000048;
static const ULONG OFFSET_PS_DIRROOT = 0x0000004C;
static const ULONG OFFSET_PS_GUID = 0x00000050;
static const ULONG OFFSET_PS_CTIMELOW = 0x00000064;
static const ULONG OFFSET_PS_CTIMEHIGH = 0x00000068;
static const ULONG OFFSET_PS_MTIMELOW = 0x0000006C;
static const ULONG OFFSET_PS_MTIMEHIGH = 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 MIN_BIG_BLOCK_SIZE_BITS = 0x0009;
static const WORD MAX_BIG_BLOCK_SIZE_BITS = 0x000c;
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 DIRENTRY_NULL = 0xFFFFFFFF;
#define DIRENTRY_NAME_MAX_LEN 0x20
#define DIRENTRY_NAME_BUFFER_LEN 0x40
#define RAW_DIRENTRY_SIZE 0x00000080
#define HEADER_SIZE 512
#define MIN_BIG_BLOCK_SIZE 0x200
#define MAX_BIG_BLOCK_SIZE 0x1000
/*
* Type of child entry link
*/
#define DIRENTRY_RELATION_PREVIOUS 0
#define DIRENTRY_RELATION_NEXT 1
#define DIRENTRY_RELATION_DIR 2
/*
* type constant used in files for the root storage
*/
#define STGTY_ROOT 0x05
#define COUNT_BBDEPOTINHEADER 109
/* FIXME: This value is stored in the header, but we hard-code it to 0x1000. */
#define LIMIT_TO_USE_SMALL_BLOCK 0x1000
#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)
/*
* Forward declarations of all the structures used by the storage
* module.
*/
typedef struct StorageBaseImpl StorageBaseImpl;
typedef struct StorageBaseImplVtbl StorageBaseImplVtbl;
typedef struct StorageImpl StorageImpl;
typedef struct BlockChainStream BlockChainStream;
typedef struct SmallBlockChainStream SmallBlockChainStream;
typedef struct IEnumSTATSTGImpl IEnumSTATSTGImpl;
typedef struct DirEntry DirEntry;
typedef struct StgStreamImpl StgStreamImpl;
/*
* A reference to a directory entry in the file or a transacted cache.
*/
typedef ULONG DirRef;
/*
* This utility structure is used to read/write the information in a directory
* entry.
*/
struct DirEntry
{
WCHAR name[DIRENTRY_NAME_MAX_LEN];
WORD sizeOfNameString;
BYTE stgType;
DirRef leftChild;
DirRef rightChild;
DirRef dirRootEntry;
GUID clsid;
FILETIME ctime;
FILETIME mtime;
ULONG startingBlock;
ULARGE_INTEGER size;
};
HRESULT FileLockBytesImpl_Construct(HANDLE hFile, DWORD openFlags, LPCWSTR pwcsName, ILockBytes **pLockBytes) DECLSPEC_HIDDEN;
/*************************************************************************
* Ole Convert support
*/
HRESULT STORAGE_CreateOleStream(IStorage*, DWORD) DECLSPEC_HIDDEN;
HRESULT OLECONVERT_CreateCompObjStream(LPSTORAGE pStorage, LPCSTR strOleTypeName) DECLSPEC_HIDDEN;
enum swmr_mode
{
SWMR_None,
SWMR_Writer,
SWMR_Reader
};
/****************************************************************************
* StorageBaseImpl definitions.
*
* This structure defines the base information contained in all implementations
* of IStorage contained in this file storage implementation.
*
* In OOP terms, this is the base class for all the IStorage implementations
* contained in this file.
*/
struct StorageBaseImpl
{
IStorage IStorage_iface;
IPropertySetStorage IPropertySetStorage_iface; /* interface for adding a properties stream */
IDirectWriterLock IDirectWriterLock_iface;
LONG ref;
/*
* Stream tracking list
*/
struct list strmHead;
/*
* Storage tracking list
*/
struct list storageHead;
/*
* TRUE if this object has been invalidated
*/
BOOL reverted;
/*
* Index of the directory entry of this storage
*/
DirRef storageDirEntry;
/*
* virtual methods.
*/
const StorageBaseImplVtbl *baseVtbl;
/*
* flags that this storage was opened or created with
*/
DWORD openFlags;
/*
* State bits appear to only be preserved while running. No in the stream
*/
DWORD stateBits;
BOOL create; /* Was the storage created or opened.
The behaviour of STGM_SIMPLE depends on this */
/*
* If this storage was opened in transacted mode, the object that implements
* the transacted snapshot or cache.
*/
StorageBaseImpl *transactedChild;
enum swmr_mode lockingrole;
};
/* virtual methods for StorageBaseImpl objects */
struct StorageBaseImplVtbl {
void (*Destroy)(StorageBaseImpl*);
void (*Invalidate)(StorageBaseImpl*);
HRESULT (*Flush)(StorageBaseImpl*);
HRESULT (*GetFilename)(StorageBaseImpl*,LPWSTR*);
HRESULT (*CreateDirEntry)(StorageBaseImpl*,const DirEntry*,DirRef*);
HRESULT (*WriteDirEntry)(StorageBaseImpl*,DirRef,const DirEntry*);
HRESULT (*ReadDirEntry)(StorageBaseImpl*,DirRef,DirEntry*);
HRESULT (*DestroyDirEntry)(StorageBaseImpl*,DirRef);
HRESULT (*StreamReadAt)(StorageBaseImpl*,DirRef,ULARGE_INTEGER,ULONG,void*,ULONG*);
HRESULT (*StreamWriteAt)(StorageBaseImpl*,DirRef,ULARGE_INTEGER,ULONG,const void*,ULONG*);
HRESULT (*StreamSetSize)(StorageBaseImpl*,DirRef,ULARGE_INTEGER);
HRESULT (*StreamLink)(StorageBaseImpl*,DirRef,DirRef);
HRESULT (*GetTransactionSig)(StorageBaseImpl*,ULONG*,BOOL);
HRESULT (*SetTransactionSig)(StorageBaseImpl*,ULONG);
HRESULT (*LockTransaction)(StorageBaseImpl*);
HRESULT (*UnlockTransaction)(StorageBaseImpl*);
};
static inline void StorageBaseImpl_Destroy(StorageBaseImpl *This)
{
This->baseVtbl->Destroy(This);
}
static inline void StorageBaseImpl_Invalidate(StorageBaseImpl *This)
{
This->baseVtbl->Invalidate(This);
}
static inline HRESULT StorageBaseImpl_Flush(StorageBaseImpl *This)
{
return This->baseVtbl->Flush(This);
}
static inline HRESULT StorageBaseImpl_GetFilename(StorageBaseImpl *This, LPWSTR *result)
{
return This->baseVtbl->GetFilename(This, result);
}
static inline HRESULT StorageBaseImpl_CreateDirEntry(StorageBaseImpl *This,
const DirEntry *newData, DirRef *index)
{
return This->baseVtbl->CreateDirEntry(This, newData, index);
}
static inline HRESULT StorageBaseImpl_WriteDirEntry(StorageBaseImpl *This,
DirRef index, const DirEntry *data)
{
return This->baseVtbl->WriteDirEntry(This, index, data);
}
static inline HRESULT StorageBaseImpl_ReadDirEntry(StorageBaseImpl *This,
DirRef index, DirEntry *data)
{
return This->baseVtbl->ReadDirEntry(This, index, data);
}
static inline HRESULT StorageBaseImpl_DestroyDirEntry(StorageBaseImpl *This,
DirRef index)
{
return This->baseVtbl->DestroyDirEntry(This, index);
}
/* Read up to size bytes from this directory entry's stream at the given offset. */
static inline HRESULT StorageBaseImpl_StreamReadAt(StorageBaseImpl *This,
DirRef index, ULARGE_INTEGER offset, ULONG size, void *buffer, ULONG *bytesRead)
{
return This->baseVtbl->StreamReadAt(This, index, offset, size, buffer, bytesRead);
}
/* Write size bytes to this directory entry's stream at the given offset,
* growing the stream if necessary. */
static inline HRESULT StorageBaseImpl_StreamWriteAt(StorageBaseImpl *This,
DirRef index, ULARGE_INTEGER offset, ULONG size, const void *buffer, ULONG *bytesWritten)
{
return This->baseVtbl->StreamWriteAt(This, index, offset, size, buffer, bytesWritten);
}
static inline HRESULT StorageBaseImpl_StreamSetSize(StorageBaseImpl *This,
DirRef index, ULARGE_INTEGER newsize)
{
return This->baseVtbl->StreamSetSize(This, index, newsize);
}
/* Make dst point to the same stream that src points to. Other stream operations
* will not work properly for entries that point to the same stream, so this
* must be a very temporary state, and only one entry pointing to a given stream
* may be reachable at any given time. */
static inline HRESULT StorageBaseImpl_StreamLink(StorageBaseImpl *This,
DirRef dst, DirRef src)
{
return This->baseVtbl->StreamLink(This, dst, src);
}
static inline HRESULT StorageBaseImpl_GetTransactionSig(StorageBaseImpl *This,
ULONG* result, BOOL refresh)
{
return This->baseVtbl->GetTransactionSig(This, result, refresh);
}
static inline HRESULT StorageBaseImpl_SetTransactionSig(StorageBaseImpl *This,
ULONG value)
{
return This->baseVtbl->SetTransactionSig(This, value);
}
static inline HRESULT StorageBaseImpl_LockTransaction(StorageBaseImpl *This)
{
return This->baseVtbl->LockTransaction(This);
}
static inline HRESULT StorageBaseImpl_UnlockTransaction(StorageBaseImpl *This)
{
return This->baseVtbl->UnlockTransaction(This);
}
/****************************************************************************
* StorageBaseImpl stream list handlers
*/
void StorageBaseImpl_AddStream(StorageBaseImpl * stg, StgStreamImpl * strm) DECLSPEC_HIDDEN;
void StorageBaseImpl_RemoveStream(StorageBaseImpl * stg, StgStreamImpl * strm) DECLSPEC_HIDDEN;
/* Number of BlockChainStream objects to cache in a StorageImpl */
#define BLOCKCHAIN_CACHE_SIZE 4
/****************************************************************************
* Storage32Impl definitions.
*
* This implementation of the IStorage32 interface represents a root
* storage. Basically, a document file.
*/
struct StorageImpl
{
struct StorageBaseImpl base;
/*
* File header
*/
WORD bigBlockSizeBits;
WORD smallBlockSizeBits;
ULONG bigBlockSize;
ULONG smallBlockSize;
ULONG bigBlockDepotCount;
ULONG rootStartBlock;
ULONG smallBlockLimit;
ULONG smallBlockDepotStart;
ULONG extBigBlockDepotStart;
ULONG *extBigBlockDepotLocations;
ULONG extBigBlockDepotLocationsSize;
ULONG extBigBlockDepotCount;
ULONG bigBlockDepotStart[COUNT_BBDEPOTINHEADER];
ULONG transactionSig;
ULONG extBlockDepotCached[MAX_BIG_BLOCK_SIZE / 4];
ULONG indexExtBlockDepotCached;
ULONG blockDepotCached[MAX_BIG_BLOCK_SIZE / 4];
ULONG indexBlockDepotCached;
ULONG prevFreeBlock;
/* All small blocks before this one are known to be in use. */
ULONG firstFreeSmallBlock;
/*
* Abstraction of the big block chains for the chains of the header.
*/
BlockChainStream* rootBlockChain;
BlockChainStream* smallBlockDepotChain;
BlockChainStream* smallBlockRootChain;
/* Cache of block chain streams objects for directory entries */
BlockChainStream* blockChainCache[BLOCKCHAIN_CACHE_SIZE];
UINT blockChainToEvict;
ILockBytes* lockBytes;
ULONG locked_bytes[8];
};
HRESULT StorageImpl_ReadRawDirEntry(
StorageImpl *This,
ULONG index,
BYTE *buffer) DECLSPEC_HIDDEN;
void UpdateRawDirEntry(
BYTE *buffer,
const DirEntry *newData) DECLSPEC_HIDDEN;
HRESULT StorageImpl_WriteRawDirEntry(
StorageImpl *This,
ULONG index,
const BYTE *buffer) DECLSPEC_HIDDEN;
HRESULT StorageImpl_ReadDirEntry(
StorageImpl* This,
DirRef index,
DirEntry* buffer) DECLSPEC_HIDDEN;
HRESULT StorageImpl_WriteDirEntry(
StorageImpl* This,
DirRef index,
const DirEntry* buffer) DECLSPEC_HIDDEN;
BlockChainStream* Storage32Impl_SmallBlocksToBigBlocks(
StorageImpl* This,
SmallBlockChainStream** ppsbChain) DECLSPEC_HIDDEN;
SmallBlockChainStream* Storage32Impl_BigBlocksToSmallBlocks(
StorageImpl* This,
BlockChainStream** ppbbChain,
ULARGE_INTEGER newSize) DECLSPEC_HIDDEN;
/****************************************************************************
* StgStreamImpl definitions.
*
* This class implements the IStream interface and represents a stream
* located inside a storage object.
*/
struct StgStreamImpl
{
IStream IStream_iface;
LONG ref;
/*
* We are an entry in the storage object's stream handler list
*/
struct list StrmListEntry;
/*
* Storage that is the parent(owner) of the stream
*/
StorageBaseImpl* parentStorage;
/*
* Access mode of this stream.
*/
DWORD grfMode;
/*
* Index of the directory entry that owns (points to) this stream.
*/
DirRef dirEntry;
/*
* This is the current position of the cursor in the stream
*/
ULARGE_INTEGER currentPosition;
};
static inline StgStreamImpl *impl_from_IStream( IStream *iface )
{
return CONTAINING_RECORD(iface, StgStreamImpl, IStream_iface);
}
/*
* Method definition for the StgStreamImpl class.
*/
StgStreamImpl* StgStreamImpl_Construct(
StorageBaseImpl* parentStorage,
DWORD grfMode,
DirRef dirEntry) DECLSPEC_HIDDEN;
/* Range lock constants.
*
* The storage format reserves the region from 0x7fffff00-0x7fffffff for
* locking and synchronization. Unfortuantely, the spec doesn't say which bytes
* within that range are used, and for what. These are guesses based on testing.
* In particular, ends of ranges may be wrong.
0x0 through 0x57: Unknown. Causes read-only exclusive opens to fail.
0x58 through 0x7f: Priority mode.
0x80: Commit lock.
0x81 through 0x91: Priority mode, again. Not sure why it uses two regions.
0x92: Lock-checking lock. Held while opening so ranges can be tested without
causing spurious failures if others try to grab or test those ranges at the
same time.
0x93 through 0xa6: Read mode.
0xa7 through 0xba: Write mode.
0xbb through 0xce: Deny read.
0xcf through 0xe2: Deny write.
0xe2 through 0xff: Unknown. Causes read-only exclusive opens to fail.
*/
#define RANGELOCK_UNK1_FIRST 0x7fffff00
#define RANGELOCK_UNK1_LAST 0x7fffff57
#define RANGELOCK_PRIORITY1_FIRST 0x7fffff58
#define RANGELOCK_PRIORITY1_LAST 0x7fffff7f
#define RANGELOCK_COMMIT 0x7fffff80
#define RANGELOCK_PRIORITY2_FIRST 0x7fffff81
#define RANGELOCK_PRIORITY2_LAST 0x7fffff91
#define RANGELOCK_CHECKLOCKS 0x7fffff92
#define RANGELOCK_READ_FIRST 0x7fffff93
#define RANGELOCK_READ_LAST 0x7fffffa6
#define RANGELOCK_WRITE_FIRST 0x7fffffa7
#define RANGELOCK_WRITE_LAST 0x7fffffba
#define RANGELOCK_DENY_READ_FIRST 0x7fffffbb
#define RANGELOCK_DENY_READ_LAST 0x7fffffce
#define RANGELOCK_DENY_WRITE_FIRST 0x7fffffcf
#define RANGELOCK_DENY_WRITE_LAST 0x7fffffe2
#define RANGELOCK_UNK2_FIRST 0x7fffffe3
#define RANGELOCK_UNK2_LAST 0x7fffffff
#define RANGELOCK_TRANSACTION_FIRST RANGELOCK_PRIORITY1_FIRST
#define RANGELOCK_TRANSACTION_LAST RANGELOCK_CHECKLOCKS
#define RANGELOCK_FIRST RANGELOCK_UNK1_FIRST
#define RANGELOCK_LAST RANGELOCK_UNK2_LAST
/******************************************************************************
* Endian conversion macros
*/
#ifdef WORDS_BIGENDIAN
#define htole32(x) RtlUlongByteSwap(x)
#define htole16(x) RtlUshortByteSwap(x)
#define lendian32toh(x) RtlUlongByteSwap(x)
#define lendian16toh(x) RtlUshortByteSwap(x)
#else
#define htole32(x) (x)
#define htole16(x) (x)
#define lendian32toh(x) (x)
#define lendian16toh(x) (x)
#endif
/******************************************************************************
* The StorageUtl_ functions are miscellaneous utility functions. Most of which
* are abstractions used to read values from file buffers without having to
* worry about bit order
*/
void StorageUtl_ReadWord(const BYTE* buffer, ULONG offset, WORD* value) DECLSPEC_HIDDEN;
void StorageUtl_WriteWord(BYTE* buffer, ULONG offset, WORD value) DECLSPEC_HIDDEN;
void StorageUtl_ReadDWord(const BYTE* buffer, ULONG offset, DWORD* value) DECLSPEC_HIDDEN;
void StorageUtl_WriteDWord(BYTE* buffer, ULONG offset, DWORD value) DECLSPEC_HIDDEN;
void StorageUtl_ReadULargeInteger(const BYTE* buffer, ULONG offset,
ULARGE_INTEGER* value) DECLSPEC_HIDDEN;
void StorageUtl_WriteULargeInteger(BYTE* buffer, ULONG offset,
const ULARGE_INTEGER *value) DECLSPEC_HIDDEN;
void StorageUtl_ReadGUID(const BYTE* buffer, ULONG offset, GUID* value) DECLSPEC_HIDDEN;
void StorageUtl_WriteGUID(BYTE* buffer, ULONG offset, const GUID* value) DECLSPEC_HIDDEN;
void StorageUtl_CopyDirEntryToSTATSTG(StorageBaseImpl *storage,STATSTG* destination,
const DirEntry* source, int statFlags) DECLSPEC_HIDDEN;
/****************************************************************************
* 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 BlockChainRun
{
/* This represents a range of blocks that happen reside in consecutive sectors. */
ULONG firstSector;
ULONG firstOffset;
ULONG lastOffset;
};
typedef struct BlockChainBlock
{
ULONG index;
ULONG sector;
BOOL read;
BOOL dirty;
BYTE data[MAX_BIG_BLOCK_SIZE];
} BlockChainBlock;
struct BlockChainStream
{
StorageImpl* parentStorage;
ULONG* headOfStreamPlaceHolder;
DirRef ownerDirEntry;
struct BlockChainRun* indexCache;
ULONG indexCacheLen;
ULONG indexCacheSize;
BlockChainBlock cachedBlocks[2];
ULONG blockToEvict;
ULONG tailIndex;
ULONG numBlocks;
};
/*
* Methods for the BlockChainStream class.
*/
BlockChainStream* BlockChainStream_Construct(
StorageImpl* parentStorage,
ULONG* headOfStreamPlaceHolder,
DirRef dirEntry) DECLSPEC_HIDDEN;
void BlockChainStream_Destroy(
BlockChainStream* This) DECLSPEC_HIDDEN;
HRESULT BlockChainStream_ReadAt(
BlockChainStream* This,
ULARGE_INTEGER offset,
ULONG size,
void* buffer,
ULONG* bytesRead) DECLSPEC_HIDDEN;
HRESULT BlockChainStream_WriteAt(
BlockChainStream* This,
ULARGE_INTEGER offset,
ULONG size,
const void* buffer,
ULONG* bytesWritten) DECLSPEC_HIDDEN;
BOOL BlockChainStream_SetSize(
BlockChainStream* This,
ULARGE_INTEGER newSize) DECLSPEC_HIDDEN;
HRESULT BlockChainStream_Flush(
BlockChainStream* This) DECLSPEC_HIDDEN;
/****************************************************************************
* 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;
DirRef ownerDirEntry;
ULONG* headOfStreamPlaceHolder;
};
/*
* Methods of the SmallBlockChainStream class.
*/
SmallBlockChainStream* SmallBlockChainStream_Construct(
StorageImpl* parentStorage,
ULONG* headOfStreamPlaceHolder,
DirRef dirEntry) DECLSPEC_HIDDEN;
void SmallBlockChainStream_Destroy(
SmallBlockChainStream* This) DECLSPEC_HIDDEN;
HRESULT SmallBlockChainStream_ReadAt(
SmallBlockChainStream* This,
ULARGE_INTEGER offset,
ULONG size,
void* buffer,
ULONG* bytesRead) DECLSPEC_HIDDEN;
HRESULT SmallBlockChainStream_WriteAt(
SmallBlockChainStream* This,
ULARGE_INTEGER offset,
ULONG size,
const void* buffer,
ULONG* bytesWritten) DECLSPEC_HIDDEN;
BOOL SmallBlockChainStream_SetSize(
SmallBlockChainStream* This,
ULARGE_INTEGER newSize) DECLSPEC_HIDDEN;
#endif /* __STORAGE32_H__ */
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