150 lines
4.3 KiB
C++
150 lines
4.3 KiB
C++
// FreeList.h -- Definition of CFreeList class and IFreeList interface.
|
|
|
|
#ifndef __FREELIST_H__
|
|
|
|
#define __FREELIST_H__
|
|
|
|
/*
|
|
|
|
This file defines the interface to the free-space manager for the Tome file. It's
|
|
done as a subclass of IPersistStreamInit so that different free list implementations
|
|
can be bound to particular Tome files automatically.
|
|
|
|
Its public methods allow you to:
|
|
|
|
1. Add a segment of LockBytes address space to the free space
|
|
|
|
2. Allocate address space from available free space
|
|
|
|
3. Attempt an allocation beginning at a particular address
|
|
|
|
4. Allocate address space at the end of the LockBytes container.
|
|
|
|
*/
|
|
|
|
#undef GetFreeSpace // kill the obsolete Win16 macro before we
|
|
// encounter the IFreeList definition...
|
|
|
|
class CFreeList : public CITUnknown
|
|
{
|
|
public:
|
|
|
|
~CFreeList();
|
|
|
|
static HRESULT CreateFreeList(IITFileSystem *pITFS, CULINT cbPreallocated, IITFreeList **ppITFreeList);
|
|
static HRESULT CreateAndSizeFreeList(IITFileSystem *pITFS, CULINT cbPreallocated, UINT cSlots, IITFreeList **ppITFreeList);
|
|
static HRESULT LoadFreeList(IITFileSystem *pITFS, IITFreeList **ppITFreeList);
|
|
static HRESULT AttachFreeList(IITFileSystem *pITFS, IITFreeList **ppITFreeList);
|
|
|
|
private:
|
|
|
|
CFreeList(IUnknown *punkOuter);
|
|
|
|
class CImpIFreeList : public IITFreeList
|
|
{
|
|
public:
|
|
|
|
CImpIFreeList(CFreeList *pBackObj, IUnknown *punkOuter);
|
|
~CImpIFreeList(void);
|
|
|
|
HRESULT ReadIn (LPSTREAM pStm, PVOID pv, ULONG cb);
|
|
HRESULT WriteOut(LPSTREAM pStm, PVOID pv, ULONG cb);
|
|
|
|
// IPersist Method:
|
|
|
|
HRESULT STDMETHODCALLTYPE GetClassID(
|
|
/* [out] */ CLSID __RPC_FAR *pClassID);
|
|
|
|
// IPersistStreamInit Methods:
|
|
|
|
HRESULT STDMETHODCALLTYPE IsDirty( void);
|
|
|
|
HRESULT STDMETHODCALLTYPE Load(
|
|
/* [in] */ LPSTREAM pStm);
|
|
|
|
HRESULT STDMETHODCALLTYPE Save(
|
|
/* [in] */ LPSTREAM pStm,
|
|
/* [in] */ BOOL fClearDirty);
|
|
|
|
HRESULT STDMETHODCALLTYPE GetSizeMax(
|
|
/* [out] */ ULARGE_INTEGER __RPC_FAR *pCbSize);
|
|
|
|
HRESULT STDMETHODCALLTYPE InitNew( void);
|
|
|
|
// IFreeList Methods:
|
|
|
|
HRESULT STDMETHODCALLTYPE InitNew(IITFileSystem *pITFS, CULINT cbPreallocated);
|
|
HRESULT STDMETHODCALLTYPE InitNew(IITFileSystem *pITFS, CULINT cbPreallocated, UINT cEntriesMax);
|
|
HRESULT STDMETHODCALLTYPE InitLoad(IITFileSystem *pITFS);
|
|
HRESULT STDMETHODCALLTYPE LazyInitNew(IITFileSystem *pITFS);
|
|
HRESULT STDMETHODCALLTYPE RecordFreeList();
|
|
|
|
HRESULT STDMETHODCALLTYPE PutFreeSpace(CULINT ullBase, CULINT ullCB);
|
|
HRESULT STDMETHODCALLTYPE GetFreeSpace(CULINT *pullBase, CULINT *pullcb);
|
|
HRESULT STDMETHODCALLTYPE GetFreeSpaceAt(CULINT ullBase, CULINT *pullcb);
|
|
HRESULT STDMETHODCALLTYPE GetEndingFreeSpace
|
|
(CULINT *pullBase, CULINT *pullcb);
|
|
HRESULT STDMETHODCALLTYPE GetStatistics
|
|
(CULINT *pcbLost, CULINT *pcbSpace);
|
|
|
|
HRESULT STDMETHODCALLTYPE SetFreeListEmpty();
|
|
HRESULT STDMETHODCALLTYPE SetSpaceSize(ULARGE_INTEGER uliCbSpace);
|
|
|
|
private:
|
|
|
|
UINT HighestEntryLEQ(CULINT &ullBase);
|
|
|
|
HRESULT STDMETHODCALLTYPE ConnectToStream();
|
|
|
|
typedef struct _freeitem
|
|
{
|
|
CULINT ullOffset; // Start of free block
|
|
CULINT ullCB; // Size of free block in bytes
|
|
|
|
} FREEITEM, *PFREEITEM;
|
|
|
|
enum { DEFAULT_ENTRIES_MAX = 510 };
|
|
|
|
CITCriticalSection m_cs;
|
|
|
|
BOOL m_fInitialed;
|
|
BOOL m_fIsDirty;
|
|
|
|
UINT m_cBlocks; // Number of blocks in list
|
|
UINT m_cBlocksMax; // Max number of blocks in list
|
|
CULINT m_cbLost; // Number of bytes totally lost forever
|
|
CULINT m_cbSpace;
|
|
|
|
BOOL m_fDirty;
|
|
IITFileSystem *m_pITFS;
|
|
|
|
DEBUGDEF(CULINT m_cbPreallocated)
|
|
|
|
PFREEITEM m_paFreeItems;
|
|
};
|
|
|
|
friend CImpIFreeList;
|
|
|
|
CImpIFreeList m_ImpIFreeList;
|
|
};
|
|
|
|
typedef CFreeList *PCFreelist;
|
|
|
|
extern GUID aIID_CFreeList[4];
|
|
extern UINT cInterfaces_CFreeList;
|
|
|
|
inline CFreeList::CFreeList(IUnknown * punkOuter)
|
|
: m_ImpIFreeList(this, punkOuter),
|
|
CITUnknown(aIID_CFreeList, cInterfaces_CFreeList, (IUnknown *)&m_ImpIFreeList)
|
|
{
|
|
}
|
|
|
|
|
|
inline CFreeList::~CFreeList
|
|
|
|
()
|
|
{
|
|
}
|
|
|
|
#endif // __FREELIST_H__
|