250 lines
6.1 KiB
C++
250 lines
6.1 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: IDXIDS.HXX
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//
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// Contents: Index ID's
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//
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// Classes: CIndexID, CIndexIdList
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//
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// History: 29-Mar-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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#pragma once
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#ifdef DISPLAY_INCLUDES
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#pragma message( "#include <" __FILE__ ">..." )
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#endif
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#define MAX_PERS_ID 0xff
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#define MAX_PART_ID 0xfffe
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#define MAX_VOL_ID 0xffff
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const INDEXID iidDeleted1 = 0xffff00ff;
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const INDEXID iidDeleted2 = 0xffff00fe;
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const INDEXID iidInvalid = 0;
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//+---------------------------------------------------------------------------
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//
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// Class: CIndexId
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//
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// Purpose: Bit field for index id
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//
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// Interface:
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//
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// History: 3-Apr-91 BartoszM Created.
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//
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// Notes: Persistent index id contains one byte per partition ID
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// Volatile index id uses two bytes for per partition ID.
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// Both contain two byte partition ID
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//
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// volatile: | part ID | volat ID > 256 |
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//
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// persistent: | part ID | zero | pers ID|
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//
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// invalid: | part ID | zero | (is persistent)
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//
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// deleted: | ffff | zero | ff | (is persistent)
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//
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//----------------------------------------------------------------------------
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class CIndexId
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{
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public:
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inline CIndexId ( ULONG l = 0L );
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inline CIndexId ( ULONG iid, PARTITIONID pid );
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inline operator INDEXID () { return *( INDEXID* ) this; }
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inline BOOL IsPersistent();
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inline PARTITIONID PartId ();
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inline BYTE PersId ();
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private:
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ULONG _pers_id:8; // persistent index ID
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ULONG _vol_id:8; // high byte of volatile index ID
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ULONG _part_id:16; // partition ID
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CIndexId::CIndexId, public
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//
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// Arguments: [iid] -- short index ID
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// [pid] -- partition ID
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//
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// History: 4-Apr-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline CIndexId::CIndexId ( ULONG iid, PARTITIONID pid )
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{
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_part_id = (USHORT) pid;
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if ( iid > MAX_PERS_ID )
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{
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_pers_id = (BYTE)iid;
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_vol_id = (BYTE)( iid >> 8);
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}
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else
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{
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_pers_id = (BYTE)iid;
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_vol_id = 0;
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}
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CIndexId::CIndexId, public
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//
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// Arguments: [l] -- another index ID
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//
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// History: 4-Apr-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline CIndexId::CIndexId ( ULONG l )
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{
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ciAssert ( sizeof(CIndexId) == sizeof ( ULONG ) );
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*( ULONG*) this = l;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CIndexId::IsPersistent, public
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//
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// Returns: TRUE if persistent index ID, FALSE otherwise
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//
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// History: 4-Apr-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline BOOL CIndexId::IsPersistent()
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{
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return _vol_id == 0;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CIndexId::PartId, public
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//
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// Returns: Partition ID encoded in index ID
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//
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// History: 4-Apr-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline PARTITIONID CIndexId::PartId()
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{
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return (PARTITIONID)_part_id;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CIndexId::PersId, public
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//
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// Returns: Persistent index ID (per partition unique)
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//
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// History: 4-Apr-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline BYTE CIndexId::PersId()
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{
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return (BYTE)_pers_id;
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}
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#if 0
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//+---------------------------------------------------------------------------
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//
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// Class: CIndexIdList
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//
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// Purpose: Array of index id's
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//
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// History: 29-Mar-91 BartoszM Created.
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//
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// Notes: Auxiliary data structure passed between partition table
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// and partition. Contains a counted array of byte sized
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// short index id's (per partition unique).
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//
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//----------------------------------------------------------------------------
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#define MAX_BIN_SIZE 255
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class CIndexIdList
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{
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friend class CPartList;
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public:
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int Count() const { return _count; }
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INDEXID GetNext( PARTITIONID pid );
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private:
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CIndexIdList (): _cur (0) {}
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BYTE* GetBuf() { return (BYTE*)_ids; }
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void SetCount ( int c ) { _count = c; }
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int _cur;
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int _count;
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BYTE _ids[MAX_BIN_SIZE];
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CIndextIdList::GetNext(), public
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//
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// Synopsis: Gets next index ID.
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//
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// Arguments: [pid] -- partition ID
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//
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// History: 1-Apr-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline INDEXID CIndexIdList::GetNext( PARTITIONID pid )
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{
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return CIndexId (_ids[_cur++], pid );
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}
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#endif // 0
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//+---------------------------------------------------------------------------
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//
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// Class: CDeletedIndex
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//
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// Purpose: Keeps track of which index is the current deleted index
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//
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// History: 12-jul-94 DwightKr Created
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//
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//----------------------------------------------------------------------------
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class CDeletedIndex
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{
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public:
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CDeletedIndex( INDEXID iid ) : _iid(iid) {}
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void SwapIndex()
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{
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_iid = GetNewIndex();
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}
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const INDEXID GetIndex() const { return _iid; }
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const INDEXID GetNewIndex() const
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{
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if ( _iid == iidDeleted1 )
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return iidDeleted2;
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else
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return iidDeleted1;
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}
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private:
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INDEXID _iid;
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};
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