114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
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#include "precomp.h"
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/*
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* memory.cpp
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*
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* Copyright (c) 1993 - 1995 by DataBeam Corporation, Lexington, KY
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*
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* Abstract:
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* This is the implementation file for the Memory class. Instances of
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* this class represent chunks of data that are passed through a system.
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* This class is particularly useful in cases where a memory buffer
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* needs to be used in several different places, none of which know
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* about each other. This is because this class encapsulates things
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* like lock counts, which are useful for holding memory until
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* everyone that needs it is through.
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*
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* Note that this class does NOT do memory management. It is told by
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* a higher level memory manager where its buffers are, etc. For this
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* reason, this class does not do any platform specific calls.
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*
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* IMPORTANT NOTE:
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* This class SHOULD NEVER contain virtual member functions. This is
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* because of the Init() member than can be called as the "constructor"
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* of this class.
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*
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* Private Instance Variables:
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* Length
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* This is the length of the reference buffer.
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* Copy_Ptr
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* This is the address of the allocated buffer that this object
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* uses.
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*
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* Private Member Functions:
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* None.
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*
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* Caveats:
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* None.
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*
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* Author:
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* James P. Galvin, Jr.
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*/
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const char *MemorySignature = "T120Memr";
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/*
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* Memory ()
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*
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* Public
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*
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* Functional Description:
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* This is the constructor for the Memory class. It just initializes
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* all instance variable, based on the passed in values.
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*/
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Memory::Memory (
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PUChar reference_ptr,
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ULong length,
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PUChar copy_ptr) :
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Length (length),
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Copy_Ptr (copy_ptr),
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lLock (1),
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m_priority (HIGHEST_PRIORITY)
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{
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SIGNATURE_COPY(MemorySignature);
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/*
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* If the reference pointer is a valid pointer, then the pointer type
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* will be set to reference (indicating that the reference data has not
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* yet been copied). If the reference pointer is NULL, then this is
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* a memory allocation with no associated reference data, so set the
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* pointer type to copy.
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*/
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if (reference_ptr != NULL)
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memcpy (Copy_Ptr, reference_ptr, (Int) Length);
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}
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/*
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* Init ()
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*
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* Public
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*
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* Functional Description:
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* This is the initializer for the Memory class, in the cases
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* where the space for an object has been allocated, without
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* calling the constructor. It just initializes
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* all instance variable, based on the passed in values.
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*
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* NOTE: Because of this use of the Memory class, it should NOT
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* contain any virtual functions.
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*/
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Void Memory::Init (
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PUChar reference_ptr,
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ULong length,
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MemoryPriority priority,
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PUChar copy_ptr)
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{
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Length = length;
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Copy_Ptr = copy_ptr;
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lLock = 1;
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m_priority = priority;
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SIGNATURE_COPY(MemorySignature);
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/*
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* If the reference pointer is a valid pointer, then the pointer type
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* will be set to reference (indicating that the reference data has not
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* yet been copied). If the reference pointer is NULL, then this is
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* a memory allocation with no associated reference data, so set the
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* pointer type to copy.
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*/
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if (reference_ptr != NULL)
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memcpy (Copy_Ptr, reference_ptr, (Int) Length);
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}
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