120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
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/*****************************************************************/
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/** Microsoft Windows for Workgroups **/
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/** Copyright (C) Microsoft Corp., 1991-1992 **/
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/*****************************************************************/
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/* BUFFER.H -- Definition of BUFFER class.
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*
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* History:
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* 03/22/93 gregj Created
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* 03/24/93 gregj Created base class, GLOBAL_BUFFER
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* 10/06/93 gregj Removed LOCAL_BUFFER and GLOBAL_BUFFER because
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* they're incompatible with Win32.
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*/
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#ifndef _INC_BUFFER
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#define _INC_BUFFER
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/*************************************************************************
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NAME: BUFFER_BASE
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SYNOPSIS: Base class for transient buffer classes
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INTERFACE: BUFFER_BASE()
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Construct with optional size of buffer to allocate.
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Resize()
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Resize buffer to specified size. Returns TRUE if
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successful.
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QuerySize()
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Return the current size of the buffer in bytes.
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QueryPtr()
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Return a pointer to the buffer.
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PARENT: None
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USES: None
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CAVEATS: This is an abstract class, which unifies the interface
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of BUFFER, GLOBAL_BUFFER, etc.
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NOTES: In standard OOP fashion, the buffer is deallocated in
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the destructor.
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HISTORY:
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03/24/93 gregj Created base class
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**************************************************************************/
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class BUFFER_BASE
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{
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protected:
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UINT _cb;
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virtual BOOL Alloc( UINT cbBuffer ) = 0;
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virtual BOOL Realloc( UINT cbBuffer ) = 0;
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public:
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BUFFER_BASE()
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{ _cb = 0; } // buffer not allocated yet
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~BUFFER_BASE()
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{ _cb = 0; } // buffer size no longer valid
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BOOL Resize( UINT cbNew );
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UINT QuerySize() const { return _cb; };
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};
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#define GLOBAL_BUFFER BUFFER
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/*************************************************************************
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NAME: BUFFER
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SYNOPSIS: Wrapper class for new and delete
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INTERFACE: BUFFER()
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Construct with optional size of buffer to allocate.
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Resize()
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Resize buffer to specified size. Only works if the
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buffer hasn't been allocated yet.
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QuerySize()
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Return the current size of the buffer in bytes.
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QueryPtr()
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Return a pointer to the buffer.
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PARENT: BUFFER_BASE
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CAVEATS:
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NOTES: In standard OOP fashion, the buffer is deallocated in
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the destructor.
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HISTORY:
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03/24/93 gregj Created
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**************************************************************************/
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class BUFFER : public BUFFER_BASE
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{
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protected:
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CHAR *_lpBuffer;
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virtual BOOL Alloc( UINT cbBuffer );
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virtual BOOL Realloc( UINT cbBuffer );
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public:
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BUFFER( UINT cbInitial=0 );
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~BUFFER();
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LPVOID QueryPtr() const { return (LPVOID)_lpBuffer; }
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operator void*() const { return (void *)_lpBuffer; }
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};
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#define LOCAL_BUFFER BUFFER
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#endif /* _INC_BUFFER */
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