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183 lines
4.5 KiB
183 lines
4.5 KiB
/* TMemory2.h
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*
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* Copyright (c) 1994-1995 by DataBeam Corporation, Lexington, KY
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*
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* Abstract:
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* This is a memory class used to manage a memory buffer. During
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* instantiation, a buffer is allocated and a prepend value is passed in.
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* The prepend value is used during the Append() call. All Append() calls
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* are appended after the prepend value. A running length is also
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* maintained. This class is good to use if you are going to build up a
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* packet over time.
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*
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* If a packet overruns the max. buffer size, a new buffer is allocated and
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* used.
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*
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* Caveats:
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* None.
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*
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* Authors:
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* James W. Lawwill
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*/
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#ifndef _TMEMORY2_
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#define _TMEMORY2_
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#define MAXIMUM_NUMBER_REALLOC_FAILURES 10
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typedef enum
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{
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TMEMORY_NO_ERROR,
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TMEMORY_NONFATAL_ERROR,
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TMEMORY_FATAL_ERROR,
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TMEMORY_NO_DATA
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}
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TMemoryError, * PTMemoryError;
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class TMemory
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{
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public:
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TMemory (
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ULong total_length,
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UShort prepend_space,
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PTMemoryError error);
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~TMemory (
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Void);
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TMemoryError Append (
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HPUChar address,
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ULong length);
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TMemoryError GetMemory (
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HPUChar * address,
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FPULong length);
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Void Reset (
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Void);
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private:
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ULong Default_Buffer_Size;
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HPUChar Base_Buffer;
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HPUChar Auxiliary_Buffer;
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ULong Length;
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DBBoolean Auxiliary_Buffer_In_Use;
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UShort Prepend_Space;
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UShort Fatal_Error_Count;
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};
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typedef TMemory * PTMemory;
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#endif
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/*
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* Documentation for Public class members
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*/
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/*
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* TMemory::TMemory (
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* ULong total_length,
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* UShort prepend_space,
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* PTMemoryError error);
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*
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* Functional Description:
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* This is the constructor for the TMemory class.
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*
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* Formal Parameters:
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* total_length (i) - Length of the default buffer
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* prepend_space (i) - Space to leave blank in the buffer
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* error (o) - Returns an error value
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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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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/*
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* TMemory::TMemory (
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* Void)
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*
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* Functional Description:
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* This is the destructor for the object.
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*
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* Formal Parameters:
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* None.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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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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/*
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* TMemoryError TMemory::Append (
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* HPUChar address,
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* ULong length);
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*
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* Functional Description:
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* This function appends the buffer passed in to the internal buffer.
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*
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* Formal Parameters:
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* address (i) - Address of buffer
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* length (i) - Length of buffer
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*
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* Return Value:
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* TMEMORY_NO_ERROR - No error
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* TMEMORY_FATAL_ERROR - Fatal error occured, can't alloc a buffer
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* TMEMORY_NONFATAL_ERROR - Buffer was not copied but it was not a
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* fatal error
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*
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* Side Effects:
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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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/*
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* TMemoryError TMemory::GetMemory (
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* HPUChar * address,
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* FPULong length);
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*
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* Functional Description:
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* This function returns the address and used length of our internal buffer
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*
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* Formal Parameters:
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* address (o) - Address of our internal buffer
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* length (i) - Length of buffer
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*
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* Return Value:
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* TMEMORY_NO_ERROR - No error
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*
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* Side Effects:
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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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/*
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* Void TMemory::Reset (
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* Void)
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*
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* Functional Description:
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* This function resets the memory object. All data in the object is lost
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*
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* Formal Parameters:
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* None
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*
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* Return Value:
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* None
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*
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* Side Effects:
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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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