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124 lines
1.9 KiB
124 lines
1.9 KiB
/*++
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Copyright (c) 1994 Microsoft Corporation
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All rights reserved.
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Module Name:
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memblock.hxx
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Abstract:
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Memory allocater for chunks of read only memory header.
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Author:
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Albert Ting (AlbertT) 30-Aug-1994
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Revision History:
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--*/
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#ifndef _MEMBLOCK_HXX
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#define _MEMBLOCK_HXX
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class TMemBlock {
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SIGNATURE( 'memb' )
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ALWAYS_VALID
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SAFE_NEW
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public:
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enum _CONSTANTS {
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kFlagGlobalNew = 0x1
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};
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TMemBlock(
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UINT uGranularity,
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DWORD fdwFlags
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);
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~TMemBlock(
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VOID
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);
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PVOID
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pvAlloc(
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DWORD dwSize
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);
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PVOID
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pvFirst(
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VOID
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);
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PVOID
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pvIter(
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VOID
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);
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UINT
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uSize(
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PVOID pvUser
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) const;
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private:
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typedef struct _DATA {
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DWORD dwSize;
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DWORD dwPadding;
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} DATA, *PDATA;
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typedef struct _BLOCK {
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struct _BLOCK* pNext;
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PDATA pDataLast;
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} BLOCK, *PBLOCK;
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PBLOCK _pFirst;
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PBLOCK _pLast;
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DWORD _uGranularity;
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DWORD _dwNextFree;
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DWORD _dwCount;
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PDATA _pDataLast;
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DWORD _dwIterCount;
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PBLOCK _pIterBlock;
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PDATA _pIterData;
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DWORD _fdwFlags;
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DWORD
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dwBlockHeaderSize(
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VOID
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) const
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{ return DWordAlign(sizeof(BLOCK)); }
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PDATA
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pBlockToData(
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PBLOCK pBlock
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) const
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{ return (PDATA)((PBYTE)pBlock + dwBlockHeaderSize()); }
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DWORD
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dwDataHeaderSize(
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VOID
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) const
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{ return DWordAlign(sizeof(DATA)); }
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PVOID
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pvDataToUser(
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PDATA pData
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) const
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{ return (PVOID)((PBYTE)pData + dwDataHeaderSize()); }
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PDATA
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pvUserToData(
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PVOID pvUser
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) const
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{ return (PDATA)((PBYTE)pvUser - dwDataHeaderSize()); }
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PDATA
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pDataNext(
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PDATA pData
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) const
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{ return (PDATA) ((PBYTE)pData + pData->dwSize); }
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};
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#endif // ndef _MEMBLOCK_HXX
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