585 lines
22 KiB
C++
585 lines
22 KiB
C++
// PathMgr.h -- Declarations for the Path Manager classes and interfaces
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#ifndef __PATHMGR_H__
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#define __PATHMGR_H__
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/*
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The path manager interface maintains a database of PathInfo entries. Entries
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are keyed by a Unicode path name. They may be enumerated in Unicode lexical order
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starting from a given path name. The path manager interfaces support retrieving,
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adding, deleting and modifying entries.
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Each entry in the database has a unique path name. Name comparisons are case
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insensitive according the rules for the U.S. English locale (0x0409). Path strings
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are stored in the database exactly as given on whenever a new record is inserted.
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Path names may be up to 259 characters long.
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*/
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#if 0
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// StreamState defines a collection of bit flags which define the
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// access and permission states for a stream or storage.
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enum StreamState { Readable = 0x00000001, // Stream may be read
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Writeable = 0x00000002, // Stream may be written
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ShareRead = 0x00000004, // Multiple readers allowed
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ShareWrite = 0x00000008, // Multiple writers allowed
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TempStream = 0x00000010, // Stream will be deleted when released
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Transacted = 0x00000020 // Stream supports Commit and Revert
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};
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#endif // 0
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//Record stucture for garbage collection
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typedef struct _SEntry{
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CULINT ullcbOffset;
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CULINT ullcbData;
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UINT ulEntryID;
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}SEntry;
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typedef SEntry *PSEntry;
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class CPathManager1 : public CITUnknown
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{
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public:
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// Destructor:
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~CPathManager1(void);
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// Creation:
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static HRESULT NewPathDatabase(IUnknown *punkOuter, ILockBytes *plb,
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UINT cbDirectoryBlock, UINT cCacheBlocksMax,
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IITPathManager **pplkb
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);
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static HRESULT LoadPathDatabase(IUnknown *punkOuter, ILockBytes *plb,
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IITPathManager **pplkb
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);
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private:
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CPathManager1(IUnknown *pUnkOuter);
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class CImpIPathManager : public IITPathManager
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{
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public:
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// Constructor and Destructor:
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CImpIPathManager(CPathManager1 *pBackObj, IUnknown *punkOuter);
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~CImpIPathManager(void);
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// Initialing routines:
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HRESULT InitNewPathDatabase(ILockBytes *plb, UINT cbDirectoryBlock,
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UINT cCacheBlocksMax);
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HRESULT InitLoadPathDatabase(ILockBytes *plb);
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// IPersist Method:
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HRESULT STDMETHODCALLTYPE GetClassID(
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/* [out] */ CLSID __RPC_FAR *pClassID);
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// IITPathManager interfaces:
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HRESULT STDMETHODCALLTYPE FlushToLockBytes();
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HRESULT STDMETHODCALLTYPE FindEntry (PPathInfo pSI );
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HRESULT STDMETHODCALLTYPE CreateEntry(PPathInfo pSINew,
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PPathInfo pSIOld,
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BOOL fReplace );
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HRESULT STDMETHODCALLTYPE DeleteEntry(PPathInfo pSI );
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HRESULT STDMETHODCALLTYPE UpdateEntry(PPathInfo pSI );
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HRESULT STDMETHODCALLTYPE EnumFromObject
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(IUnknown *punkOuter, const WCHAR *pwszPrefix, UINT cwcPrefix,
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REFIID riid, PVOID *ppv
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);
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HRESULT STDMETHODCALLTYPE GetPathDB(IStreamITEx *pTempPDBStrm, BOOL fCompact);
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HRESULT STDMETHODCALLTYPE ForceClearDirty();
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private:
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// The PathInfo data type is used to pass stream information through function
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// interfaces within the Path Manager. It is not used as the on-disk layout.
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// The on-disk information is kept as follows:
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//
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// cbPath // Byte length of abPath; Stored as VL32
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// abPath // UTF-8 representation of awszStreamPath
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// uStateBits // Stored as high order dword of VL64
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// iLockedBytesSegment // Stored as low order dword of VL64
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// ullcbOffset // Stored as VL64 // Used with ullcbData
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// ullcbData // Stored as VL64 // to store storage guids
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//
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// VL32 and VL64 storage formats, respectively, are 32 and 64 bit variable length
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// storage formats. The use the convention that the last byte in the representation
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// is less than 0x80. That is, each byte contains seven bits of information.
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typedef struct _TaggedPathInfo
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{
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UINT iDirectoryBlock; // Index of dir block containing this info
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UINT cbEntryOffset; // Offset of info within dir block
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UINT cbEncoded; // Size of entry within dir block
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PathInfo SI;
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} TaggedPathInfo, *PTaggedPathInfo;
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// The structures below define the on-disk structure of leaf nodes
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// and internal nodes. Leaf nodes are the bottom of the B-Tree heirarchy.
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// Internal nodes are in the levels above the leaf nodes.
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// First we define two type tags for the nodes:
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enum { uiMagicLeaf = ('L' << 24 ) | ('G' << 16) | ('M' << 8) | 'P',
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uiMagicInternal = ('I' << 24 ) | ('G' << 16) | ('M' << 8) | 'P',
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uiMagicUnused = ('U' << 24 ) | ('G' << 16) | ('M' << 8) | 'P'
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};
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// All nodes begin with a node header:
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typedef struct _NodeHeader
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{
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UINT uiMagic; // A type tag to mark leafs and internal nodes.
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UINT cbSlack; // Free space in the trailing portion of the node.
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// UINT cEntries; // Now kept at end of node.
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} NodeHeader, *PNodeHeader;
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// Leaf nodes have additional header information to maintain a chain
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// through all the leaf nodes:
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typedef struct _LeafChainLinks
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{
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UINT iLeafSerial; // Serial number for this leaf. Changed when an
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// enumeration offset might become invalid.
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UINT iLeafPrevious; // Leaf nodes are placed in a lexically ordered chain.
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UINT iLeafNext; // These are the links for that double linked chain.
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} LeafChainLinks, *PLeafChainLinks;
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// Now we can define the structures for leaf nodes and internal nodes.
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// Note the use of ab[0]. That's because our nodes size is defined when
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// the B-Tree is created. That size includes both the ab space for key
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// entries and the header for the node. Since all nodes must be the same
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// size than means the ab space for internal nodes is eight-bytes bigger
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// than the ab space in leaf nodes. We keep all nodes the same size
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// to make the free list mechanism work cleanly. That is, when a leaf
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// node is discarded and added to the free list, it may be resurrected
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// later and taken out of the free list to become either an internal node
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// or a leaf node.
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typedef struct _LeafNode
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{
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NodeHeader nh;
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LeafChainLinks lcl;
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BYTE ab[0];
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} LeafNode, *PLeafNode;
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typedef struct _InternalNode
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{
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NodeHeader nh;
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BYTE ab[0];
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} InternalNode, *PInternalNode;
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// When we read nodes into memory, we embed them in a cache block
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// structure so we can add extra state information.
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typedef struct _CacheBlock
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{
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UINT fFlags; // Type and state bits (Defined below).
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struct _CacheBlock *pCBPrev; // Previous block in LRU chain.
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struct _CacheBlock *pCBNext; // Next block in LRU chain or
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// Next block in free chain.
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UINT iBlock; // Index of the disk slot corresponding to this node.
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UINT cbKeyOffset; // Set by the key scanning routines to mark where
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// a key was found or where a new key may be inserted.
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UINT cbEntry; // Size in bytes of key plus record.
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union
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{
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LeafNode ldb;
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InternalNode idb;
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};
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} CacheBlock, *PCacheBlock;
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enum { FreeBlock = 0x00000001, // Cache block is not in use
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InternalBlock = 0x00000002, // Block holds an internal directory
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LeafBlock = 0x00000004, // Block holds a leaf directory
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BlockTypeMask = 0x00000007, // Bits which define block type
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DirtyBlock = 0x00000008, // Block does not match on-disk data.
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LockedBlock = 0x00000010, // Block is locked in memory
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ReadingIn = 0x00000020, // Block is being read from disk
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WritingOut = 0x00000040 // Block is being written to disk
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};
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typedef struct _SInternalNodeLev{
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PInternalNode pINode;
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ULONG cbFirstKey;
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ULONG cEntries;
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}SInternalNodeLev;
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HRESULT STDMETHODCALLTYPE CompactPathDB(IStreamITEx *pTempPDBStrm);
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HRESULT UpdateHigherLev(IStreamITEx *pTempPDBStrm,
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UINT iCurILev,
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UINT *piNodeNext,
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SInternalNodeLev *rgINode,
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PBYTE pbFirstKey,
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ULONG cbFirstKey);
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UINT PredictNodeID(UINT iCurILev,
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UINT iNodeNext,
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SInternalNodeLev *rgINode,
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PBYTE pbFirstKey,
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ULONG cbFirstKey);
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HRESULT BinarySearch(UINT uiStart,
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UINT uiEnd,
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PBYTE pauAccess,
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UINT cbAccess,
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PTaggedPathInfo ptsi,
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PBYTE ab,
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PBYTE *ppbOut,
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BOOL fSmall);
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// These routines manage a key count field at the end of a node.
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// The count may be absent if cbSlack is too small. It may be zero
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// when the access vector doesn't exist.
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void KillKeyCount(LeafNode *pln);
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// These routines manage cache block allocation and deallocation.
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// When there are no unused blocks, the GetCacheBlocks routine will
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// free the oldest unlocked block, writing its content to disk if
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// necessary.
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HRESULT GetCacheBlock (PCacheBlock *ppCB, UINT fTypeMask);
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HRESULT FreeCacheBlock(PCacheBlock pCB);
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HRESULT GetFreeBlock(PCacheBlock &pCB);
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HRESULT GetActiveBlock(PCacheBlock &pCB, BOOL fIgnoreLocks = FALSE);
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void MarkAsMostRecent(PCacheBlock pCB);
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void RemoveFromUse (PCacheBlock pCB);
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// These routines handle disk I/O for cache blocks.
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HRESULT ReadCacheBlock(PCacheBlock pCB, UINT iBlock);
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HRESULT WriteCacheBlock(PCacheBlock pCB);
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HRESULT FlushToDisk();
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// The FindCacheBlock routine finds a cache block which contains
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// the image of a particular node block. If that data doesn't
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// exist in the cache, it will read it from disk.
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HRESULT FindCacheBlock(PCacheBlock *ppCB, UINT iBlock);
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// This routine allocate a new node on disk and in the cache blocks.
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HRESULT AllocateNode(PCacheBlock *ppCB, UINT fTypeMask);
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// This routine adds a node to the free list.
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HRESULT DiscardNode(PCacheBlock pCB);
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// These routines search through the B-Tree nodes looking for a key
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// or a place to insert a new key.
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HRESULT FindKeyAndLockBlockSet
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(PTaggedPathInfo ptsi, PCacheBlock *papCBSet,
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UINT iLevel, UINT cLevels = UINT(~0)
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);
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HRESULT ScanInternalForKey(PCacheBlock pCacheBlock, PTaggedPathInfo ptsi,
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PUINT piChild
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);
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HRESULT ScanLeafForKey(PCacheBlock pCacheBlock, PTaggedPathInfo ptsi);
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// ClearLockFlags turns off lock flags for all cache entries.
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void ClearLockFlags(PCacheBlock *papCBSet);
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// ClearLockFlagsAbove turns off lock flags for levels above iLevel.
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void ClearLockFlagsAbove(PCacheBlock *papCBSet, UINT iLevel);
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// These routines insert, delete, and modify entries in a leaf node.
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HRESULT InsertEntryIntoLeaf(PTaggedPathInfo ptsi, PCacheBlock *papCBSet);
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HRESULT UpdateEntryInLeaf (PTaggedPathInfo ptsi, PCacheBlock *papCBSet);
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// These routines insert, delete, and modify entries in any node
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HRESULT InsertEntryIntoNode(PTaggedPathInfo ptsi, PBYTE pb, UINT cb, PCacheBlock *papCBSet, UINT iLevel, BOOL fAfter);
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HRESULT RemoveEntryFromNode(PTaggedPathInfo ptsi, PCacheBlock *papCBSet, UINT iLevel);
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HRESULT ModifyEntryInNode (PTaggedPathInfo ptsi, PBYTE pb, UINT cb, PCacheBlock *papCBSet, UINT iLevel);
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// These routines insert a key, remove a key, or modify the information for
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// an existing key. The iLevel parameter indicates the level of the tree
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// being modified. Level numbers start at the leaves and go upward.
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HRESULT InsertAKey (UINT iLevel, PCacheBlock pCacheBlock, PTaggedPathInfo ptsi);
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HRESULT RemoveAKey (UINT iLevel, PPathInfo pSI);
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HRESULT ModifyKeyData(UINT iLevel, PCacheBlock pCacheBlock, PTaggedPathInfo ptsi);
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// This routine splits a node to create more slack space.
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HRESULT SplitANode(PCacheBlock *papCBSet, UINT iLevel);
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// Routines for encoding and decoding on-disk representations of stream information:
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HRESULT DecodePathKey(const BYTE **ppb, PWCHAR pwszPath, PUINT pcwcPath);
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PBYTE EncodePathKey( PBYTE pb, const WCHAR *pwszPath, UINT cwcPath);
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HRESULT DecodeKeyInfo(const BYTE **ppb, PPathInfo pSI);
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PBYTE EncodeKeyInfo( PBYTE pb, const PathInfo *pSI);
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PBYTE SkipKeyInfo(PBYTE pb);
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HRESULT DecodePathInfo(const BYTE **ppb, PPathInfo pSI);
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PBYTE EncodePathInfo( PBYTE pb, const PathInfo *pSI);
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BOOL ValidBlockIndex(UINT iBlock);
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HRESULT SaveHeader();
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enum
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{
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INVALID_INDEX = UINT(~0),
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CB_STREAM_INFO_MAX = MAX_UTF8_PATH + 2 * 10 + 2 * 5 + 2,
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PathMagicID = ('P' << 24) | ('S' << 16) | ('T' << 8) | 'I',
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PathVersion = 1
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};
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class CEnumPathMgr1 : public CITUnknown
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{
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public:
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~CEnumPathMgr1();
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static HRESULT NewPathEnumeratorObject
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(IUnknown *punkOuter, CImpIPathManager *pPM,
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const WCHAR *pwszPathPrefix,
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UINT cwcPathPrefix,
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REFIID riid,
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PVOID *ppv
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);
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static HRESULT NewPathEnumerator(IUnknown *punkOuter, CImpIPathManager *pPM,
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const WCHAR *pwszPathPrefix,
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UINT cwcPathPrefix,
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IEnumSTATSTG **ppEnumSTATSTG
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);
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private:
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CEnumPathMgr1(IUnknown *pUnkOuter);
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class CImpIEnumSTATSTG : public IITEnumSTATSTG
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{
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public:
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CImpIEnumSTATSTG(CITUnknown *pBackObj, IUnknown *punkOuter);
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~CImpIEnumSTATSTG();
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HRESULT STDMETHODCALLTYPE InitPathEnumerator(CImpIPathManager *pPM,
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const WCHAR *pwszPathPrefix,
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UINT cwcPathPrefix
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);
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//IITEnumSTATSTG interface methods
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HRESULT STDMETHODCALLTYPE GetNextEntryInSeq(ULONG celt, PathInfo *rgelt, ULONG *pceltFetched);
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HRESULT STDMETHODCALLTYPE GetFirstEntryInSeq(PathInfo *rgelt);
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HRESULT STDMETHODCALLTYPE Next(
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/* [in] */ ULONG celt,
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/* [in] */ STATSTG __RPC_FAR *rgelt,
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/* [out] */ ULONG __RPC_FAR *pceltFetched);
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HRESULT STDMETHODCALLTYPE Skip(
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/* [in] */ ULONG celt);
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HRESULT STDMETHODCALLTYPE Reset( void);
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HRESULT STDMETHODCALLTYPE Clone(
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/* [out] */ IEnumSTATSTG __RPC_FAR *__RPC_FAR *ppenum);
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private:
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HRESULT STDMETHODCALLTYPE FindEntry();
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HRESULT STDMETHODCALLTYPE NextEntry();
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CImpIPathManager *m_pPM; // Context of this enumeration
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PathInfo m_SI; // Last entry returned
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UINT m_iLeafBlock; // Index for leaf containing last entry
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UINT m_cbOffsetLastEntry;// Position of prev entry in that leaf
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UINT m_cbLastEntry; // Size of prev entry.
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UINT m_iSerialNode; // Leaf Serial number
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UINT m_iSerialDatabase; // Database serial number
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UINT m_cwcPathPrefix; // Length of starting prefix
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WCHAR m_pwszPathPrefix[MAX_PATH]; // Starting prefix
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// We use leaf and database serial numbers to determine whether our position
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// information is still valid. The serial number for a leaf changes whenever
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// a change would invalidate our offset into the leaf. This includes cases
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// where the node is split and also cases where an entry changes shape. That
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// is, we increment the leaf serial number when we delete an entry or modify
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// it so that its content is larger or smaller. Inserting an entry also
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// increments the leaf's serial number. However appending an entry to the
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// end of the leaf won't change its serial number because that change would
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// not invalidate any enumeration offset.
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//
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// The serial number for the database is incremented whenever we delete a
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// leaf node. This may indicate that our recorded m_iLeafBlock is no longer
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// valid.
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//
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// Whenever we have a mismatch with either the leaf serial or the database
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// serial, we search for a match rather than relying on our position
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// information.
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//
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// Note also the initial condition where m_iSerialNode and m_iSerialDatabase
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// are zero. By convention the serial number sequence skips the value zero.
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};
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CImpIEnumSTATSTG m_ImpEnumSTATSTG;
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};
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friend CEnumPathMgr1;
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friend CEnumPathMgr1::CImpIEnumSTATSTG;
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// We set the minimum directory block size so that we'll always be able
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// to handle the longest possible path together with the worst case
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// encoding for path information. In the worst case a leaf node can just
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// barely accomodate a single item.
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// The MIN_CACHE_ENTRIES constant controls the number of directory blocks
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// which we will cache in memory. We may actually cache more blocks for
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// a deep B-Tree.
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enum { MIN_DIRECTORY_BLOCK_SIZE = MAX_UTF8_PATH + 30 + sizeof(LeafNode),
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MIN_CACHE_ENTRIES = 2
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};
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// The database header is a meta directory for the node blocks.
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// It is the first thing in the on-disk data stream.
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typedef struct _DatabaseHeader
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{
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ULONG uiMagic; // ID value "ITSP"
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ULONG uiVersion; // Revision # for this structure
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ULONG cbHeader; // sizeof(DatabaseHeader);
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ULONG cCacheBlocksMax; // Number of cache blocks allowed
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ULONG cbDirectoryBlock; // Size of a directory block
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ULONG cEntryAccessShift; // Base 2 log of Gap in entry access vector
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ULONG cDirectoryLevels; // Nesting depth from root to leaf
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ULONG iRootDirectory; // The top most internal directory
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ULONG iLeafFirst; // Lexically first leaf block
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ULONG iLeafLast; // Lexically last leaf block
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ULONG iBlockFirstFree; // First block in unused block chain
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ULONG cBlocks; // Number of directory blocks in use
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LCID lcid; // Locale (sorting conventions, comparision rules)
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CLSID clsidEntryHandler; // Interface which understands node entries
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UINT cbPrefix; // Size of fixed portion of data base
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ULONG iOrdinalMapRoot; // Ordinal map root for when they don't fit in a block
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ULONG iOrdinalMapFirst; // First and last Ordinal map for leaf blocks.
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ULONG iOrdinalMapLast; // These are linked like the leaf blocks.
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// Note instance data for the Entry handler immediately follows the
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// database header. That data is counted by cbPrefix.
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} DatabaseHeader, PDatabaseHeader;
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CITCriticalSection m_cs;
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ILockBytes *m_plbPathDatabase; // Disk image of the path database header.
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DatabaseHeader m_dbh; // Header info for the path database.
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BOOL m_fHeaderIsDirty; // Header doesn't match disk version.
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UINT m_cCacheBlocks; // Number of active cache blocks
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|
PCacheBlock m_pCBLeastRecent; // LRU end of the in-use chain
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|
PCacheBlock m_pCBMostRecent; // MRU end of the in-use chain
|
|
PCacheBlock m_pCBFreeList; // Chain of unused cache blocks
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|
|
|
UINT m_PathSetSerial; // Serial number for the path set data base.
|
|
// Incremented whenever we delete a leaf node.
|
|
};
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|
|
|
CImpIPathManager m_PathManager;
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|
|
|
};
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|
|
typedef CPathManager1 *PCPathManager1;
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|
|
|
extern GUID aIID_CPathManager[];
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|
|
|
extern UINT cInterfaces_CPathManager;
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|
|
|
#pragma warning( disable : 4355 )
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|
|
|
inline CPathManager1::CPathManager1(IUnknown *pUnkOuter)
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|
: m_PathManager(this, pUnkOuter),
|
|
CITUnknown(aIID_CPathManager, cInterfaces_CPathManager, &m_PathManager)
|
|
{
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|
|
|
}
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|
|
|
inline CPathManager1::~CPathManager1(void)
|
|
{
|
|
|
|
}
|
|
|
|
|
|
inline BOOL CPathManager1::CImpIPathManager::ValidBlockIndex(UINT iBlock)
|
|
{
|
|
// We use all-ones as an invalid index value.
|
|
|
|
return ~iBlock;
|
|
}
|
|
|
|
inline CPathManager1::CImpIPathManager::CEnumPathMgr1::CEnumPathMgr1(IUnknown *pUnkOuter)
|
|
: m_ImpEnumSTATSTG(this, pUnkOuter),
|
|
CITUnknown(&IID_IEnumSTATSTG, 1, &m_ImpEnumSTATSTG)
|
|
{
|
|
|
|
}
|
|
|
|
inline CPathManager1::CImpIPathManager::CEnumPathMgr1::~CEnumPathMgr1(void)
|
|
{
|
|
|
|
}
|
|
|
|
// Routines for encoding and decoding variable length
|
|
// representations for 32 and 64 bit values:
|
|
|
|
ULONG DecodeVL32(const BYTE **ppb);
|
|
CULINT DecodeVL64(const BYTE **ppb);
|
|
|
|
ULONG CodeSizeVL32(ULONG ul);
|
|
|
|
PBYTE EncodeVL32(PBYTE pb, ULONG ul);
|
|
PBYTE EncodeVL64(PBYTE pb, CULINT *ull);
|
|
|
|
PBYTE SkipVL(PBYTE pb);
|
|
|
|
#endif // __PATHMGR_H__
|